src/third-party/libpng/CHANGES (view raw)
1
2CHANGES - changes for libpng
3
4Version 0.2
5 added reader into png.h
6 fixed small problems in stub file
7
8Version 0.3
9 added pull reader
10 split up pngwrite.c to several files
11 added pnglib.txt
12 added example.c
13 cleaned up writer, adding a few new transformations
14 fixed some bugs in writer
15 interfaced with zlib 0.5
16 added K&R support
17 added check for 64 KB blocks for 16-bit machines
18
19Version 0.4
20 cleaned up code and commented code
21 simplified time handling into png_time
22 created png_color_16 and png_color_8 to handle color needs
23 cleaned up color type defines
24 fixed various bugs
25 made various names more consistent
26 interfaced with zlib 0.71
27 cleaned up zTXt reader and writer (using zlib's Reset functions)
28 split transformations into pngrtran.c and pngwtran.c
29
30Version 0.5
31 interfaced with zlib 0.8
32 fixed many reading and writing bugs
33 saved using 3 spaces instead of tabs
34
35Version 0.6
36 added png_large_malloc() and png_large_free()
37 added png_size_t
38 cleaned up some compiler warnings
39 added png_start_read_image()
40
41Version 0.7
42 cleaned up lots of bugs
43 finished dithering and other stuff
44 added test program
45 changed name from pnglib to libpng
46
47Version 0.71 [June, 1995]
48 changed pngtest.png for zlib 0.93
49 fixed error in libpng.txt and example.c
50
51Version 0.8
52 cleaned up some bugs
53 added png_set_filler()
54 split up pngstub.c into pngmem.c, pngio.c, and pngerror.c
55 added #define's to remove unwanted code
56 moved png_info_init() to png.c
57 added old_size into png_realloc()
58 added functions to manually set filtering and compression info
59 changed compression parameters based on image type
60 optimized filter selection code
61 added version info
62 changed external functions passing floats to doubles (k&r problems?)
63 put all the configurable stuff in pngconf.h
64 enabled png_set_shift to work with paletted images on read
65 added png_read_update_info() - updates info structure with transformations
66
67Version 0.81 [August, 1995]
68 incorporated Tim Wegner's medium model code (thanks, Tim)
69
70Version 0.82 [September, 1995]
71 [unspecified changes]
72
73Version 0.85 [December, 1995]
74 added more medium model code (almost everything's a far)
75 added i/o, error, and memory callback functions
76 fixed some bugs (16-bit, 4-bit interlaced, etc.)
77 added first run progressive reader (barely tested)
78
79Version 0.86 [January, 1996]
80 fixed bugs
81 improved documentation
82
83Version 0.87 [January, 1996]
84 fixed medium model bugs
85 fixed other bugs introduced in 0.85 and 0.86
86 added some minor documentation
87
88Version 0.88 [January, 1996]
89 fixed progressive bugs
90 replaced tabs with spaces
91 cleaned up documentation
92 added callbacks for read/write and warning/error functions
93
94Version 0.89 [July, 1996]
95 Added new initialization API to make libpng work better with shared libs
96 we now have png_create_read_struct(), png_create_write_struct(),
97 png_create_info_struct(), png_destroy_read_struct(), and
98 png_destroy_write_struct() instead of the separate calls to
99 malloc and png_read_init(), png_info_init(), and png_write_init()
100 Changed warning/error callback functions to fix bug - this means you
101 should use the new initialization API if you were using the old
102 png_set_message_fn() calls, and that the old API no longer exists
103 so that people are aware that they need to change their code
104 Changed filter selection API to allow selection of multiple filters
105 since it didn't work in previous versions of libpng anyways
106 Optimized filter selection code
107 Fixed png_set_background() to allow using an arbitrary RGB color for
108 paletted images
109 Fixed gamma and background correction for paletted images, so
110 png_correct_palette is not needed unless you are correcting an
111 external palette (you will need to #define PNG_CORRECT_PALETTE_SUPPORTED
112 in pngconf.h) - if nobody uses this, it may disappear in the future.
113 Fixed bug with Borland 64K memory allocation (Alexander Lehmann)
114 Fixed bug in interlace handling (Smarasderagd, I think)
115 Added more error checking for writing and image to reduce invalid files
116 Separated read and write functions so that they won't both be linked
117 into a binary when only reading or writing functionality is used
118 New pngtest image also has interlacing and zTXt
119 Updated documentation to reflect new API
120
121Version 0.90 [January, 1997]
122 Made CRC errors/warnings on critical and ancillary chunks configurable
123 libpng will use the zlib CRC routines by (compile-time) default
124 Changed DOS small/medium model memory support - needs zlib 1.04 (Tim Wegner)
125 Added external C++ wrapper statements to png.h (Gilles Dauphin)
126 Allow PNG file to be read when some or all of file signature has already
127 been read from the beginning of the stream. ****This affects the size
128 of info_struct and invalidates all programs that use a shared libpng****
129 Fixed png_filler() declarations
130 Fixed? background color conversions
131 Fixed order of error function pointers to match documentation
132 Current chunk name is now available in png_struct to reduce the number
133 of nearly identical error messages (will simplify multi-lingual
134 support when available)
135 Try to get ready for unknown-chunk callback functions:
136 - previously read critical chunks are flagged, so the chunk handling
137 routines can determine if the chunk is in the right place
138 - all chunk handling routines have the same prototypes, so we will
139 be able to handle all chunks via a callback mechanism
140 Try to fix Linux "setjmp" buffer size problems
141 Removed png_large_malloc, png_large_free, and png_realloc functions.
142
143Version 0.95 [March, 1997]
144 Fixed bug in pngwutil.c allocating "up_row" twice and "avg_row" never
145 Fixed bug in PNG file signature compares when start != 0
146 Changed parameter type of png_set_filler(...filler...) from png_byte
147 to png_uint_32
148 Added test for MACOS to ensure that both math.h and fp.h are not #included
149 Added macros for libpng to be compiled as a Windows DLL (Andreas Kupries)
150 Added "packswap" transformation, which changes the endianness of
151 packed-pixel bytes (Kevin Bracey)
152 Added "strip_alpha" transformation, which removes the alpha channel of
153 input images without using it (not necessarily a good idea)
154 Added "swap_alpha" transformation, which puts the alpha channel in front
155 of the color bytes instead of after
156 Removed all implicit variable tests which assume NULL == 0 (I think)
157 Changed several variables to "png_size_t" to show 16/32-bit limitations
158 Added new pCAL chunk read/write support
159 Added experimental filter selection weighting (Greg Roelofs)
160 Removed old png_set_rgbx() and png_set_xrgb() functions that have been
161 obsolete for about 2 years now (use png_set_filler() instead)
162 Added macros to read 16- and 32-bit ints directly from buffer, to be
163 used only on those systems that support it (namely PowerPC and 680x0)
164 With some testing, this may become the default for MACOS/PPC systems.
165 Only calculate CRC on data if we are going to use it
166 Added macros for zTXt compression type PNG_zTXt_COMPRESSION_???
167 Added macros for simple libpng debugging output selectable at compile time
168 Removed PNG_READ_END_MODE in progressive reader (Smarasderagd)
169 More description of info_struct in libpng.txt and png.h
170 More instructions in example.c
171 More chunk types tested in pngtest.c
172 Renamed pngrcb.c to pngset.c, and all png_read_<chunk> functions to be
173 png_set_<chunk>. We now have corresponding png_get_<chunk>
174 functions in pngget.c to get information in info_ptr. This isolates
175 the application from the internal organization of png_info_struct
176 (good for shared library implementations).
177
178Version 0.96 [May, 1997]
179 Fixed serious bug with < 8bpp images introduced in 0.95
180 Fixed 256-color transparency bug (Greg Roelofs)
181 Fixed up documentation (Greg Roelofs, Laszlo Nyul)
182 Fixed "error" in pngconf.h for Linux setjmp() behavior
183 Fixed DOS medium model support (Tim Wegner)
184 Fixed png_check_keyword() for case with error in static string text
185 Added read of CRC after IEND chunk for embedded PNGs (Laszlo Nyul)
186 Added typecasts to quiet compiler errors
187 Added more debugging info
188
189Version 0.97 [January, 1998]
190 Removed PNG_USE_OWN_CRC capability
191 Relocated png_set_crc_action from pngrutil.c to pngrtran.c
192 Fixed typecasts of "new_key", etc. (Andreas Dilger)
193 Added RFC 1152 [sic] date support
194 Fixed bug in gamma handling of 4-bit grayscale
195 Added 2-bit grayscale gamma handling (Glenn R-P)
196 Added more typecasts. 65536L becomes (png_uint_32)65536L, etc. (Glenn R-P)
197 Minor corrections in libpng.txt
198 Added simple sRGB support (Glenn R-P)
199 Easier conditional compiling, e.g.,
200 define PNG_READ/WRITE_NOT_FULLY_SUPPORTED;
201 all configurable options can be selected from command-line instead
202 of having to edit pngconf.h (Glenn R-P)
203 Fixed memory leak in pngwrite.c (free info_ptr->text) (Glenn R-P)
204 Added more conditions for png_do_background, to avoid changing
205 black pixels to background when a background is supplied and
206 no pixels are transparent
207 Repaired PNG_NO_STDIO behavior
208 Tested NODIV support and made it default behavior (Greg Roelofs)
209 Added "-m" option and PNGTEST_DEBUG_MEMORY to pngtest (John Bowler)
210 Regularized version numbering scheme and bumped shared-library major
211 version number to 2 to avoid problems with libpng 0.89 apps
212 (Greg Roelofs)
213
214Version 0.98 [January, 1998]
215 Cleaned up some typos in libpng.txt and in code documentation
216 Fixed memory leaks in pCAL chunk processing (Glenn R-P and John Bowler)
217 Cosmetic change "display_gamma" to "screen_gamma" in pngrtran.c
218 Changed recommendation about file_gamma for PC images to .51 from .45,
219 in example.c and libpng.txt, added comments to distinguish between
220 screen_gamma, viewing_gamma, and display_gamma.
221 Changed all references to RFC1152 to read RFC1123 and changed the
222 PNG_TIME_RFC1152_SUPPORTED macro to PNG_TIME_RFC1123_SUPPORTED
223 Added png_invert_alpha capability (Glenn R-P -- suggestion by Jon Vincent)
224 Changed srgb_intent from png_byte to int to avoid compiler bugs
225
226Version 0.99 [January 30, 1998]
227 Free info_ptr->text instead of end_info_ptr->text in pngread.c (John Bowler)
228 Fixed a longstanding "packswap" bug in pngtrans.c
229 Fixed some inconsistencies in pngconf.h that prevented compiling with
230 PNG_READ_GAMMA_SUPPORTED and PNG_READ_hIST_SUPPORTED undefined
231 Fixed some typos and made other minor rearrangement of libpng.txt (Andreas)
232 Changed recommendation about file_gamma for PC images to .50 from .51 in
233 example.c and libpng.txt, and changed file_gamma for sRGB images to .45
234 Added a number of functions to access information from the png structure
235 png_get_image_height(), etc. (Glenn R-P, suggestion by Brad Pettit)
236 Added TARGET_MACOS similar to zlib-1.0.8
237 Define PNG_ALWAYS_EXTERN when __MWERKS__ && WIN32 are defined
238 Added type casting to all png_malloc() function calls
239
240Version 0.99a [January 31, 1998]
241 Added type casts and parentheses to all returns that return a value.(Tim W.)
242
243Version 0.99b [February 4, 1998]
244 Added type cast png_uint_32 on malloc function calls where needed.
245 Changed type of num_hist from png_uint_32 to int (same as num_palette).
246 Added checks for rowbytes overflow, in case png_size_t is less than 32 bits.
247 Renamed makefile.elf to makefile.lnx.
248
249Version 0.99c [February 7, 1998]
250 More type casting. Removed erroneous overflow test in pngmem.c.
251 Added png_buffered_memcpy() and png_buffered_memset(), apply them to rowbytes.
252 Added UNIX manual pages libpng.3 (incorporating libpng.txt) and png.5.
253
254Version 0.99d [February 11, 1998]
255 Renamed "far_to_near()" "png_far_to_near()"
256 Revised libpng.3
257 Version 99c "buffered" operations didn't work as intended. Replaced them
258 with png_memcpy_check() and png_memset_check().
259 Added many "if (png_ptr == NULL) return" to quell compiler warnings about
260 unused png_ptr, mostly in pngget.c and pngset.c.
261 Check for overlength tRNS chunk present when indexed-color PLTE is read.
262 Cleaned up spelling errors in libpng.3/libpng.txt
263 Corrected a problem with png_get_tRNS() which returned undefined trans array
264
265Version 0.99e [February 28, 1998]
266 Corrected png_get_tRNS() again.
267 Add parentheses for easier reading of pngget.c, fixed "||" should be "&&".
268 Touched up example.c to make more of it compileable, although the entire
269 file still can't be compiled (Willem van Schaik)
270 Fixed a bug in png_do_shift() (Bryan Tsai)
271 Added a space in png.h prototype for png_write_chunk_start()
272 Replaced pngtest.png with one created with zlib 1.1.1
273 Changed pngtest to report PASS even when file size is different (Jean-loup G.)
274 Corrected some logic errors in png_do_invert_alpha() (Chris Patterson)
275
276Version 0.99f [March 5, 1998]
277 Corrected a bug in pngpread() introduced in version 99c (Kevin Bracey)
278 Moved makefiles into a "scripts" directory, and added INSTALL instruction file
279 Added makefile.os2 and pngos2.def (A. Zabolotny) and makefile.s2x (W. Sebok)
280 Added pointers to "note on libpng versions" in makefile.lnx and README
281 Added row callback feature when reading and writing nonprogressive rows
282 and added a test of this feature in pngtest.c
283 Added user transform callbacks, with test of the feature in pngtest.c
284
285Version 0.99g [March 6, 1998, morning]
286 Minor changes to pngtest.c to suppress compiler warnings.
287 Removed "beta" language from documentation.
288
289Version 0.99h [March 6, 1998, evening]
290 Minor changes to previous minor changes to pngtest.c
291 Changed PNG_READ_NOT_FULLY_SUPPORTED to PNG_READ_TRANSFORMS_NOT_SUPPORTED
292 and added PNG_PROGRESSIVE_READ_NOT_SUPPORTED macro
293 Added user transform capability
294
295Version 1.00 [March 7, 1998]
296 Changed several typedefs in pngrutil.c
297 Added makefile.wat (Pawel Mrochen), updated makefile.tc3 (Willem van Schaik)
298 Replaced "while(1)" with "for(;;)"
299 Added PNGARG() to prototypes in pngtest.c and removed some prototypes
300 Updated some of the makefiles (Tom Lane)
301 Changed some typedefs (s_start, etc.) in pngrutil.c
302 Fixed dimensions of "short_months" array in pngwrite.c
303 Replaced ansi2knr.c with the one from jpeg-v6
304
305Version 1.0.0 [March 8, 1998]
306 Changed name from 1.00 to 1.0.0 (Adam Costello)
307 Added smakefile.ppc (with SCOPTIONS.ppc) for Amiga PPC (Andreas Kleinert)
308
309Version 1.0.0a [March 9, 1998]
310 Fixed three bugs in pngrtran.c to make gamma+background handling consistent
311 (Greg Roelofs)
312 Changed format of the PNG_LIBPNG_VER integer to xyyzz instead of xyz
313 for major, minor, and bugfix releases. This is 10001. (Adam Costello,
314 Tom Lane)
315 Make months range from 1-12 in png_convert_to_rfc1123
316
317Version 1.0.0b [March 13, 1998]
318 Quieted compiler complaints about two empty "for" loops in pngrutil.c
319 Minor changes to makefile.s2x
320 Removed #ifdef/#endif around a png_free() in pngread.c
321
322Version 1.0.1 [March 14, 1998]
323 Changed makefile.s2x to reduce security risk of using a relative pathname
324 Fixed some typos in the documentation (Greg).
325 Fixed a problem with value of "channels" returned by png_read_update_info()
326
327Version 1.0.1a [April 21, 1998]
328 Optimized Paeth calculations by replacing abs() function calls with intrinsics
329 plus other loop optimizations. Improves avg decoding speed by about 20%.
330 Commented out i386istic "align" compiler flags in makefile.lnx.
331 Reduced the default warning level in some makefiles, to make them consistent.
332 Removed references to IJG and JPEG in the ansi2knr.c copyright statement.
333 Fixed a bug in png_do_strip_filler with XXRRGGBB => RRGGBB transformation.
334 Added grayscale and 16-bit capability to png_do_read_filler().
335 Fixed a bug in pngset.c, introduced in version 0.99c, that sets rowbytes
336 too large when writing an image with bit_depth < 8 (Bob Dellaca).
337 Corrected some bugs in the experimental weighted filtering heuristics.
338 Moved a misplaced pngrutil code block that truncates tRNS if it has more
339 than num_palette entries -- test was done before num_palette was defined.
340 Fixed a png_convert_to_rfc1123() bug that converts day 31 to 0 (Steve Eddins).
341 Changed compiler flags in makefile.wat for better optimization
342 (Pawel Mrochen).
343
344Version 1.0.1b [May 2, 1998]
345 Relocated png_do_gray_to_rgb() within png_do_read_transformations() (Greg).
346 Relocated the png_composite macros from pngrtran.c to png.h (Greg).
347 Added makefile.sco (contributed by Mike Hopkirk).
348 Fixed two bugs (missing definitions of "istop") introduced in libpng-1.0.1a.
349 Fixed a bug in pngrtran.c that would set channels=5 under some circumstances.
350 More work on the Paeth-filtering, achieving imperceptible speedup
351 (A Kleinert).
352 More work on loop optimization which may help when compiled with C++
353 compilers.
354 Added warnings when people try to use transforms they've defined out.
355 Collapsed 4 "i" and "c" loops into single "i" loops in pngrtran and pngwtran.
356 Revised paragraph about png_set_expand() in libpng.txt and libpng.3 (Greg)
357
358Version 1.0.1c [May 11, 1998]
359 Fixed a bug in pngrtran.c (introduced in libpng-1.0.1a) where the masks for
360 filler bytes should have been 0xff instead of 0xf.
361 Added max_pixel_depth=32 in pngrutil.c when using FILLER with palette images.
362 Moved PNG_WRITE_WEIGHTED_FILTER_SUPPORTED and PNG_WRITE_FLUSH_SUPPORTED
363 out of the PNG_WRITE_TRANSFORMS_NOT_SUPPORTED block of pngconf.h
364 Added "PNG_NO_WRITE_TRANSFORMS" etc., as alternatives for *_NOT_SUPPORTED,
365 for consistency, in pngconf.h
366 Added individual "ifndef PNG_NO_[CAPABILITY]" in pngconf.h to make it easier
367 to remove unwanted capabilities via the compile line
368 Made some corrections to grammar (which, it's) in documentation (Greg).
369 Corrected example.c, use of row_pointers in png_write_image().
370
371Version 1.0.1d [May 24, 1998]
372 Corrected several statements that used side effects illegally in pngrutil.c
373 and pngtrans.c, that were introduced in version 1.0.1b
374 Revised png_read_rows() to avoid repeated if-testing for NULL (A Kleinert)
375 More corrections to example.c, use of row_pointers in png_write_image()
376 and png_read_rows().
377 Added pngdll.mak and pngdef.pas to scripts directory, contributed by
378 Bob Dellaca, to make a png32bd.dll with Borland C++ 4.5
379 Fixed error in example.c with png_set_text: num_text is 3, not 2 (Guido V.)
380 Changed several loops from count-down to count-up, for consistency.
381
382Version 1.0.1e [June 6, 1998]
383 Revised libpng.txt and libpng.3 description of png_set_read|write_fn(), and
384 added warnings when people try to set png_read_fn and png_write_fn in
385 the same structure.
386 Added a test such that png_do_gamma will be done when num_trans==0
387 for truecolor images that have defined a background. This corrects an
388 error that was introduced in libpng-0.90 that can cause gamma processing
389 to be skipped.
390 Added tests in png.h to include "trans" and "trans_values" in structures
391 when PNG_READ_BACKGROUND_SUPPORTED or PNG_READ_EXPAND_SUPPORTED is defined.
392 Add png_free(png_ptr->time_buffer) in png_destroy_read_struct()
393 Moved png_convert_to_rfc_1123() from pngwrite.c to png.c
394 Added capability for user-provided malloc_fn() and free_fn() functions,
395 and revised pngtest.c to demonstrate their use, replacing the
396 PNGTEST_DEBUG_MEM feature.
397 Added makefile.w32, for Microsoft C++ 4.0 and later (Tim Wegner).
398
399Version 1.0.2 [June 14, 1998]
400 Fixed two bugs in makefile.bor .
401
402Version 1.0.2a [December 30, 1998]
403 Replaced and extended code that was removed from png_set_filler() in 1.0.1a.
404 Fixed a bug in png_do_filler() that made it fail to write filler bytes in
405 the left-most pixel of each row (Kevin Bracey).
406 Changed "static pngcharp tIME_string" to "static char tIME_string[30]"
407 in pngtest.c (Duncan Simpson).
408 Fixed a bug in pngtest.c that caused pngtest to try to write a tIME chunk
409 even when no tIME chunk was present in the source file.
410 Fixed a problem in pngrutil.c: gray_to_rgb didn't always work with 16-bit.
411 Fixed a problem in png_read_push_finish_row(), which would not skip some
412 passes that it should skip, for images that are less than 3 pixels high.
413 Interchanged the order of calls to png_do_swap() and png_do_shift()
414 in pngwtran.c (John Cromer).
415 Added #ifdef PNG_DEBUG/#endif surrounding use of PNG_DEBUG in png.h .
416 Changed "bad adaptive filter type" from error to warning in pngrutil.c .
417 Fixed a documentation error about default filtering with 8-bit indexed-color.
418 Separated the PNG_NO_STDIO macro into PNG_NO_STDIO and PNG_NO_CONSOLE_IO
419 (L. Peter Deutsch).
420 Added png_set_rgb_to_gray() and png_get_rgb_to_gray_status() functions.
421 Added png_get_copyright() and png_get_header_version() functions.
422 Revised comments on png_set_progressive_read_fn() in libpng.txt and example.c
423 Added information about debugging in libpng.txt and libpng.3 .
424 Changed "ln -sf" to "ln -s -f" in makefile.s2x, makefile.lnx, and
425 makefile.sco.
426 Removed lines after Dynamic Dependencies" in makefile.aco .
427 Revised makefile.dec to make a shared library (Jeremie Petit).
428 Removed trailing blanks from all files.
429
430Version 1.0.2a [January 6, 1999]
431 Removed misplaced #endif and #ifdef PNG_NO_EXTERN near the end of png.h
432 Added "if" tests to silence complaints about unused png_ptr in png.h and png.c
433 Changed "check_if_png" function in example.c to return true (nonzero) if PNG.
434 Changed libpng.txt to demonstrate png_sig_cmp() instead of png_check_sig()
435 which is obsolete.
436
437Version 1.0.3 [January 14, 1999]
438 Added makefile.hux, for Hewlett Packard HPUX 10.20 and 11.00 (Jim Rice)
439 Added a statement of Y2K compliance in png.h, libpng.3, and Y2KINFO.
440
441Version 1.0.3a [August 12, 1999]
442 Added check for PNG_READ_INTERLACE_SUPPORTED in pngread.c; issue a warning
443 if an attempt is made to read an interlaced image when it's not supported.
444 Added check if png_ptr->trans is defined before freeing it in pngread.c
445 Modified the Y2K statement to include versions back to version 0.71
446 Fixed a bug in the check for valid IHDR bit_depth/color_types in pngrutil.c
447 Modified makefile.wat (added -zp8 flag, ".symbolic", changed some comments)
448 Replaced leading blanks with tab characters in makefile.hux
449 Changed "dworkin.wustl.edu" to "ccrc.wustl.edu" in various documents.
450 Changed (float)red and (float)green to (double)red, (double)green
451 in png_set_rgb_to_gray() to avoid "promotion" problems in AIX.
452 Fixed a bug in pngconf.h that omitted <stdio.h> when PNG_DEBUG==0 (K Bracey).
453 Reformatted libpng.3 and libpngpf.3 with proper fonts (script by J. vanZandt).
454 Updated documentation to refer to the PNG-1.2 specification.
455 Removed ansi2knr.c and left pointers to the latest source for ansi2knr.c
456 in makefile.knr, INSTALL, and README (L. Peter Deutsch)
457 Fixed bugs in calculation of the length of rowbytes when adding alpha
458 channels to 16-bit images, in pngrtran.c (Chris Nokleberg)
459 Added function png_set_user_transform_info() to store user_transform_ptr,
460 user_depth, and user_channels into the png_struct, and a function
461 png_get_user_transform_ptr() to retrieve the pointer (Chris Nokleberg)
462 Added function png_set_empty_plte_permitted() to make libpng useable
463 in MNG applications.
464 Corrected the typedef for png_free_ptr in png.h (Jesse Jones).
465 Correct gamma with srgb is 45455 instead of 45000 in pngrutil.c, to be
466 consistent with PNG-1.2, and allow variance of 500 before complaining.
467 Added assembler code contributed by Intel in file pngvcrd.c and modified
468 makefile.w32 to use it (Nirav Chhatrapati, INTEL Corporation,
469 Gilles Vollant)
470 Changed "ln -s -f" to "ln -f -s" in the makefiles to make Solaris happy.
471 Added some aliases for png_set_expand() in pngrtran.c, namely
472 png_set_expand_PLTE(), png_set_expand_depth(), and png_set_expand_tRNS()
473 (Greg Roelofs, in "PNG: The Definitive Guide").
474 Added makefile.beo for BEOS on X86, contributed by Sander Stok.
475
476Version 1.0.3b [August 26, 1999]
477 Replaced 2147483647L several places with PNG_MAX_UINT macro, defined in png.h
478 Changed leading blanks to tabs in all makefiles.
479 Define PNG_USE_PNGVCRD in makefile.w32, to get MMX assembler code.
480 Made alternate versions of png_set_expand() in pngrtran.c, namely
481 png_set_gray_1_2_4_to_8, png_set_palette_to_rgb, and png_set_tRNS_to_alpha
482 (Greg Roelofs, in "PNG: The Definitive Guide"). Deleted the 1.0.3a aliases.
483 Relocated start of 'extern "C"' block in png.h so it doesn't include pngconf.h
484 Revised calculation of num_blocks in pngmem.c to avoid a potentially
485 negative shift distance, whose results are undefined in the C language.
486 Added a check in pngset.c to prevent writing multiple tIME chunks.
487 Added a check in pngwrite.c to detect invalid small window_bits sizes.
488
489Version 1.0.3d [September 4, 1999]
490 Fixed type casting of igamma in pngrutil.c
491 Added new png_expand functions to scripts/pngdef.pas and pngos2.def
492 Added a demo read_user_transform_fn that examines the row filters in pngtest.c
493
494Version 1.0.4 [September 24, 1999]
495 Define PNG_ALWAYS_EXTERN in pngconf.h if __STDC__ is defined
496 Delete #define PNG_INTERNAL and include "png.h" from pngasmrd.h
497 Made several minor corrections to pngtest.c
498 Renamed the makefiles with longer but more user friendly extensions.
499 Copied the PNG copyright and license to a separate LICENSE file.
500 Revised documentation, png.h, and example.c to remove reference to
501 "viewing_gamma" which no longer appears in the PNG specification.
502 Revised pngvcrd.c to use MMX code for interlacing only on the final pass.
503 Updated pngvcrd.c to use the faster C filter algorithms from libpng-1.0.1a
504 Split makefile.win32vc into two versions, makefile.vcawin32 (uses MMX
505 assembler code) and makefile.vcwin32 (doesn't).
506 Added a CPU timing report to pngtest.c (enabled by defining PNGTEST_TIMING)
507 Added a copy of pngnow.png to the distribution.
508
509Version 1.0.4a [September 25, 1999]
510 Increase max_pixel_depth in pngrutil.c if a user transform needs it.
511 Changed several division operations to right-shifts in pngvcrd.c
512
513Version 1.0.4b [September 30, 1999]
514 Added parentheses in line 3732 of pngvcrd.c
515 Added a comment in makefile.linux warning about buggy -O3 in pgcc 2.95.1
516
517Version 1.0.4c [October 1, 1999]
518 Added a "png_check_version" function in png.c and pngtest.c that will generate
519 a helpful compiler error if an old png.h is found in the search path.
520 Changed type of png_user_transform_depth|channels from int to png_byte.
521
522Version 1.0.4d [October 6, 1999]
523 Changed 0.45 to 0.45455 in png_set_sRGB()
524 Removed unused PLTE entries from pngnow.png
525 Re-enabled some parts of pngvcrd.c (png_combine_row) that work properly.
526
527Version 1.0.4e [October 10, 1999]
528 Fixed sign error in pngvcrd.c (Greg Roelofs)
529 Replaced some instances of memcpy with simple assignments in pngvcrd (GR-P)
530
531Version 1.0.4f [October 15, 1999]
532 Surrounded example.c code with #if 0 .. #endif to prevent people from
533 inadvertently trying to compile it.
534 Changed png_get_header_version() from a function to a macro in png.h
535 Added type casting mostly in pngrtran.c and pngwtran.c
536 Removed some pointless "ptr = NULL" in pngmem.c
537 Added a "contrib" directory containing the source code from Greg's book.
538
539Version 1.0.5 [October 15, 1999]
540 Minor editing of the INSTALL and README files.
541
542Version 1.0.5a [October 23, 1999]
543 Added contrib/pngsuite and contrib/pngminus (Willem van Schaik)
544 Fixed a typo in the png_set_sRGB() function call in example.c (Jan Nijtmans)
545 Further optimization and bugfix of pngvcrd.c
546 Revised pngset.c so that it does not allocate or free memory in the user's
547 text_ptr structure. Instead, it makes its own copy.
548 Created separate write_end_info_struct in pngtest.c for a more severe test.
549 Added code in pngwrite.c to free info_ptr->text[i].key to stop a memory leak.
550
551Version 1.0.5b [November 23, 1999]
552 Moved PNG_FLAG_HAVE_CHUNK_HEADER, PNG_FLAG_BACKGROUND_IS_GRAY and
553 PNG_FLAG_WROTE_tIME from flags to mode.
554 Added png_write_info_before_PLTE() function.
555 Fixed some typecasting in contrib/gregbook/*.c
556 Updated scripts/makevms.com and added makevms.com to contrib/gregbook
557 and contrib/pngminus (Martin Zinser)
558
559Version 1.0.5c [November 26, 1999]
560 Moved png_get_header_version from png.h to png.c, to accommodate ansi2knr.
561 Removed all global arrays (according to PNG_NO_GLOBAL_ARRAYS macro), to
562 accommodate making DLL's: Moved usr_png_ver from global variable to function
563 png_get_header_ver() in png.c. Moved png_sig to png_sig_bytes in png.c and
564 eliminated use of png_sig in pngwutil.c. Moved the various png_CHNK arrays
565 into pngtypes.h. Eliminated use of global png_pass arrays. Declared the
566 png_CHNK and png_pass arrays to be "const". Made the global arrays
567 available to applications (although none are used in libpng itself) when
568 PNG_NO_GLOBAL_ARRAYS is not defined or when PNG_GLOBAL_ARRAYS is defined.
569 Removed some extraneous "-I" from contrib/pngminus/makefile.std
570 Changed the PNG_sRGB_INTENT macros in png.h to be consistent with PNG-1.2.
571 Change PNG_SRGB_INTENT to PNG_sRGB_INTENT in libpng.txt and libpng.3
572
573Version 1.0.5d [November 29, 1999]
574 Add type cast (png_const_charp) two places in png.c
575 Eliminated pngtypes.h; use macros instead to declare PNG_CHNK arrays.
576 Renamed "PNG_GLOBAL_ARRAYS" to "PNG_USE_GLOBAL_ARRAYS" and made available
577 to applications a macro "PNG_USE_LOCAL_ARRAYS".
578 comment out (with #ifdef) all the new declarations when
579 PNG_USE_GLOBAL_ARRAYS is defined.
580 Added PNG_EXPORT_VAR macro to accommodate making DLL's.
581
582Version 1.0.5e [November 30, 1999]
583 Added iCCP, iTXt, and sPLT support; added "lang" member to the png_text
584 structure; refactored the inflate/deflate support to make adding new chunks
585 with trailing compressed parts easier in the future, and added new functions
586 png_free_iCCP, png_free_pCAL, png_free_sPLT, png_free_text, png_get_iCCP,
587 png_get_spalettes, png_set_iCCP, png_set_spalettes (Eric S. Raymond).
588 NOTE: Applications that write text chunks MUST define png_text->lang
589 before calling png_set_text(). It must be set to NULL if you want to
590 write tEXt or zTXt chunks. If you want your application to be able to
591 run with older versions of libpng, use
592
593 #ifdef PNG_iTXt_SUPPORTED
594 png_text[i].lang = NULL;
595 #endif
596
597 Changed png_get_oFFs() and png_set_oFFs() to use signed rather than unsigned
598 offsets (Eric S. Raymond).
599 Combined PNG_READ_cHNK_SUPPORTED and PNG_WRITE_cHNK_SUPPORTED macros into
600 PNG_cHNK_SUPPORTED and combined the three types of PNG_text_SUPPORTED
601 macros, leaving the separate macros also available.
602 Removed comments on #endifs at the end of many short, non-nested #if-blocks.
603
604Version 1.0.5f [December 6, 1999]
605 Changed makefile.solaris to issue a warning about potential problems when
606 the ucb "ld" is in the path ahead of the ccs "ld".
607 Removed "- [date]" from the "synopsis" line in libpng.3 and libpngpf.3.
608 Added sCAL chunk support (Eric S. Raymond).
609
610Version 1.0.5g [December 7, 1999]
611 Fixed "png_free_spallettes" typo in png.h
612 Added code to handle new chunks in pngpread.c
613 Moved PNG_CHNK string macro definitions outside of PNG_NO_EXTERN block
614 Added "translated_key" to png_text structure and png_write_iTXt().
615 Added code in pngwrite.c to work around a newly discovered zlib bug.
616
617Version 1.0.5h [December 10, 1999]
618 NOTE: regarding the note for version 1.0.5e, the following must also
619 be included in your code:
620 png_text[i].translated_key = NULL;
621 Unknown chunk handling is now supported.
622 Option to eliminate all floating point support was added. Some new
623 fixed-point functions such as png_set_gAMA_fixed() were added.
624 Expanded tabs and removed trailing blanks in source files.
625
626Version 1.0.5i [December 13, 1999]
627 Added some type casts to silence compiler warnings.
628 Renamed "png_free_spalette" to "png_free_spalettes" for consistency.
629 Removed leading blanks from a #define in pngvcrd.c
630 Added some parameters to the new png_set_keep_unknown_chunks() function.
631 Added a test for up->location != 0 in the first instance of writing
632 unknown chunks in pngwrite.c
633 Changed "num" to "i" in png_free_spalettes() and png_free_unknowns() to
634 prevent recursion.
635 Added png_free_hIST() function.
636 Various patches to fix bugs in the sCAL and integer cHRM processing,
637 and to add some convenience macros for use with sCAL.
638
639Version 1.0.5j [December 21, 1999]
640 Changed "unit" parameter of png_write_sCAL from png_byte to int, to work
641 around buggy compilers.
642 Added new type "png_fixed_point" for integers that hold float*100000 values
643 Restored backward compatibility of tEXt/zTXt chunk processing:
644 Restored the first four members of png_text to the same order as v.1.0.5d.
645 Added members "lang_key" and "itxt_length" to png_text struct. Set
646 text_length=0 when "text" contains iTXt data. Use the "compression"
647 member to distinguish among tEXt/zTXt/iTXt types. Added
648 PNG_ITXT_COMPRESSION_NONE (1) and PNG_ITXT_COMPRESSION_zTXt(2) macros.
649 The "Note" above, about backward incompatibility of libpng-1.0.5e, no
650 longer applies.
651 Fixed png_read|write_iTXt() to read|write parameters in the right order,
652 and to write the iTXt chunk after IDAT if it appears in the end_ptr.
653 Added pnggccrd.c, version of pngvcrd.c Intel assembler for gcc (Greg Roelofs)
654 Reversed the order of trying to write floating-point and fixed-point gAMA.
655
656Version 1.0.5k [December 27, 1999]
657 Added many parentheses, e.g., "if (a && b & c)" becomes "if (a && (b & c))"
658 Added png_handle_as_unknown() function (Glenn)
659 Added png_free_chunk_list() function and chunk_list and num_chunk_list members
660 of png_ptr.
661 Eliminated erroneous warnings about multiple sPLT chunks and sPLT-after-PLTE.
662 Fixed a libpng-1.0.5h bug in pngrutil.c that was issuing erroneous warnings
663 about ignoring incorrect gAMA with sRGB (gAMA was in fact not ignored)
664 Added png_free_tRNS(); png_set_tRNS() now malloc's its own trans array (ESR).
665 Define png_get_int_32 when oFFs chunk is supported as well as when pCAL is.
666 Changed type of proflen from png_int_32 to png_uint_32 in png_get_iCCP().
667
668Version 1.0.5l [January 1, 2000]
669 Added functions png_set_read_user_chunk_fn() and png_get_user_chunk_ptr()
670 for setting a callback function to handle unknown chunks and for
671 retrieving the associated user pointer (Glenn).
672
673Version 1.0.5m [January 7, 2000]
674 Added high-level functions png_read_png(), png_write_png(), png_free_pixels().
675
676Version 1.0.5n [January 9, 2000]
677 Added png_free_PLTE() function, and modified png_set_PLTE() to malloc its
678 own memory for info_ptr->palette. This makes it safe for the calling
679 application to free its copy of the palette any time after it calls
680 png_set_PLTE().
681
682Version 1.0.5o [January 20, 2000]
683 Cosmetic changes only (removed some trailing blanks and TABs)
684
685Version 1.0.5p [January 31, 2000]
686 Renamed pngdll.mak to makefile.bd32
687 Cosmetic changes in pngtest.c
688
689Version 1.0.5q [February 5, 2000]
690 Relocated the makefile.solaris warning about PATH problems.
691 Fixed pngvcrd.c bug by pushing/popping registers in mmxsupport (Bruce Oberg)
692 Revised makefile.gcmmx
693 Added PNG_SETJMP_SUPPORTED, PNG_SETJMP_NOT_SUPPORTED, and PNG_ABORT() macros
694
695Version 1.0.5r [February 7, 2000]
696 Removed superfluous prototype for png_get_itxt from png.h
697 Fixed a bug in pngrtran.c that improperly expanded the background color.
698 Return *num_text=0 from png_get_text() when appropriate, and fix documentation
699 of png_get_text() in libpng.txt/libpng.3.
700
701Version 1.0.5s [February 18, 2000]
702 Added "png_jmp_env()" macro to pngconf.h, to help people migrate to the
703 new error handler that's planned for the next libpng release, and changed
704 example.c, pngtest.c, and contrib programs to use this macro.
705 Revised some of the DLL-export macros in pngconf.h (Greg Roelofs)
706 Fixed a bug in png_read_png() that caused it to fail to expand some images
707 that it should have expanded.
708 Fixed some mistakes in the unused and undocumented INCH_CONVERSIONS functions
709 in pngget.c
710 Changed the allocation of palette, history, and trans arrays back to
711 the version 1.0.5 method (linking instead of copying) which restores
712 backward compatibility with version 1.0.5. Added some remarks about
713 that in example.c. Added "free_me" member to info_ptr and png_ptr
714 and added png_free_data() function.
715 Updated makefile.linux and makefile.gccmmx to make directories conditionally.
716 Made cosmetic changes to pngasmrd.h
717 Added png_set_rows() and png_get_rows(), for use with png_read|write_png().
718 Modified png_read_png() to allocate info_ptr->row_pointers only if it
719 hasn't already been allocated.
720
721Version 1.0.5t [March 4, 2000]
722 Changed png_jmp_env() migration aiding macro to png_jmpbuf().
723 Fixed "interlace" typo (should be "interlaced") in contrib/gregbook/read2-x.c
724 Fixed bug with use of PNG_BEFORE_IHDR bit in png_ptr->mode, introduced when
725 PNG_FLAG_HAVE_CHUNK_HEADER was moved into png_ptr->mode in version 1.0.5b
726 Files in contrib/gregbook were revised to use png_jmpbuf() and to select
727 a 24-bit visual if one is available, and to allow abbreviated options.
728 Files in contrib/pngminus were revised to use the png_jmpbuf() macro.
729 Removed spaces in makefile.linux and makefile.gcmmx, introduced in 1.0.5s
730
731Version 1.0.5u [March 5, 2000]
732 Simplified the code that detects old png.h in png.c and pngtest.c
733 Renamed png_spalette (_p, _pp) to png_sPLT_t (_tp, _tpp)
734 Increased precision of rgb_to_gray calculations from 8 to 15 bits and
735 added png_set_rgb_to_gray_fixed() function.
736 Added makefile.bc32 (32-bit Borland C++, C mode)
737
738Version 1.0.5v [March 11, 2000]
739 Added some parentheses to the png_jmpbuf macro definition.
740 Updated references to the zlib home page, which has moved to freesoftware.com.
741 Corrected bugs in documentation regarding png_read_row() and png_write_row().
742 Updated documentation of png_rgb_to_gray calculations in libpng.3/libpng.txt.
743 Renamed makefile.borland,turboc3 back to makefile.bor,tc3 as in version 1.0.3,
744 revised borland makefiles; added makefile.ibmvac3 and makefile.gcc (Cosmin)
745
746Version 1.0.6 [March 20, 2000]
747 Minor revisions of makefile.bor, libpng.txt, and gregbook/rpng2-win.c
748 Added makefile.sggcc (SGI IRIX with gcc)
749
750Version 1.0.6d [April 7, 2000]
751 Changed sprintf() to strcpy() in png_write_sCAL_s() to work without STDIO
752 Added data_length parameter to png_decompress_chunk() function
753 Revised documentation to remove reference to abandoned png_free_chnk functions
754 Fixed an error in png_rgb_to_gray_fixed()
755 Revised example.c, usage of png_destroy_write_struct().
756 Renamed makefile.ibmvac3 to makefile.ibmc, added libpng.icc IBM project file
757 Added a check for info_ptr->free_me&PNG_FREE_TEXT when freeing text in png.c
758 Simplify png_sig_bytes() function to remove use of non-ISO-C strdup().
759
760Version 1.0.6e [April 9, 2000]
761 Added png_data_freer() function.
762 In the code that checks for over-length tRNS chunks, added check of
763 info_ptr->num_trans as well as png_ptr->num_trans (Matthias Benckmann)
764 Minor revisions of libpng.txt/libpng.3.
765 Check for existing data and free it if the free_me flag is set, in png_set_*()
766 and png_handle_*().
767 Only define PNG_WEIGHTED_FILTERS_SUPPORTED when PNG_FLOATING_POINT_SUPPORTED
768 is defined.
769 Changed several instances of PNG_NO_CONSOLE_ID to PNG_NO_STDIO in pngrutil.c
770 and mentioned the purposes of the two macros in libpng.txt/libpng.3.
771
772Version 1.0.6f [April 14, 2000]
773 Revised png_set_iCCP() and png_set_rows() to avoid prematurely freeing data.
774 Add checks in png_set_text() for NULL members of the input text structure.
775 Revised libpng.txt/libpng.3.
776 Removed superfluous prototype for png_set_iTXt from png.h
777 Removed "else" from pngread.c, after png_error(), and changed "0" to "length".
778 Changed several png_errors about malformed ancillary chunks to png_warnings.
779
780Version 1.0.6g [April 24, 2000]
781 Added png_pass-* arrays to pnggccrd.c when PNG_USE_LOCAL_ARRAYS is defined.
782 Relocated paragraph about png_set_background() in libpng.3/libpng.txt
783 and other revisions (Matthias Benckmann)
784 Relocated info_ptr->free_me, png_ptr->free_me, and other info_ptr and
785 png_ptr members to restore binary compatibility with libpng-1.0.5
786 (breaks compatibility with libpng-1.0.6).
787
788Version 1.0.6h [April 24, 2000]
789 Changed shared library so-number pattern from 2.x.y.z to xy.z (this builds
790 libpng.so.10 & libpng.so.10.6h instead of libpng.so.2 & libpng.so.2.1.0.6h)
791 This is a temporary change for test purposes.
792
793Version 1.0.6i [May 2, 2000]
794 Rearranged some members at the end of png_info and png_struct, to put
795 unknown_chunks_num and free_me within the original size of the png_structs
796 and free_me, png_read_user_fn, and png_free_fn within the original png_info,
797 because some old applications allocate the structs directly instead of
798 using png_create_*().
799 Added documentation of user memory functions in libpng.txt/libpng.3
800 Modified png_read_png so that it will use user_allocated row_pointers
801 if present, unless free_me directs that it be freed, and added description
802 of the use of png_set_rows() and png_get_rows() in libpng.txt/libpng.3.
803 Added PNG_LEGACY_SUPPORTED macro, and #ifdef out all new (since version
804 1.00) members of png_struct and png_info, to regain binary compatibility
805 when you define this macro. Capabilities lost in this event
806 are user transforms (new in version 1.0.0),the user transform pointer
807 (new in version 1.0.2), rgb_to_gray (new in 1.0.5), iCCP, sCAL, sPLT,
808 the high-level interface, and unknown chunks support (all new in 1.0.6).
809 This was necessary because of old applications that allocate the structs
810 directly as authors were instructed to do in libpng-0.88 and earlier,
811 instead of using png_create_*().
812 Added modes PNG_CREATED_READ_STRUCT and PNG_CREATED_WRITE_STRUCT which
813 can be used to detect codes that directly allocate the structs, and
814 code to check these modes in png_read_init() and png_write_init() and
815 generate a libpng error if the modes aren't set and PNG_LEGACY_SUPPORTED
816 was not defined.
817 Added makefile.intel and updated makefile.watcom (Pawel Mrochen)
818
819Version 1.0.6j [May 3, 2000]
820 Overloaded png_read_init() and png_write_init() with macros that convert
821 calls to png_read_init_2() or png_write_init_2() that check the version
822 and structure sizes.
823
824Version 1.0.7beta11 [May 7, 2000]
825 Removed the new PNG_CREATED_READ_STRUCT and PNG_CREATED_WRITE_STRUCT modes
826 which are no longer used.
827 Eliminated the three new members of png_text when PNG_LEGACY_SUPPORTED is
828 defined or when neither PNG_READ_iTXt_SUPPORTED nor PNG_WRITE_iTXT_SUPPORTED
829 is defined.
830 Made PNG_NO_READ|WRITE_iTXt the default setting, to avoid memory
831 overrun when old applications fill the info_ptr->text structure directly.
832 Added PNGAPI macro, and added it to the definitions of all exported functions.
833 Relocated version macro definitions ahead of the includes of zlib.h and
834 pngconf.h in png.h.
835
836Version 1.0.7beta12 [May 12, 2000]
837 Revised pngset.c to avoid a problem with expanding the png_debug macro.
838 Deleted some extraneous defines from pngconf.h
839 Made PNG_NO_CONSOLE_IO the default condition when PNG_BUILD_DLL is defined.
840 Use MSC _RPTn debugging instead of fprintf if _MSC_VER is defined.
841 Added png_access_version_number() function.
842 Check for mask&PNG_FREE_CHNK (for TEXT, SCAL, PCAL) in png_free_data().
843 Expanded libpng.3/libpng.txt information about png_data_freer().
844
845Version 1.0.7beta14 [May 17, 2000] (beta13 was not published)
846 Changed pnggccrd.c and pngvcrd.c to handle bad adaptive filter types as
847 warnings instead of errors, as pngrutil.c does.
848 Set the PNG_INFO_IDAT valid flag in png_set_rows() so png_write_png()
849 will actually write IDATs.
850 Made the default PNG_USE_LOCAL_ARRAYS depend on PNG_DLL instead of WIN32.
851 Make png_free_data() ignore its final parameter except when freeing data
852 that can have multiple instances (text, sPLT, unknowns).
853 Fixed a new bug in png_set_rows().
854 Removed info_ptr->valid tests from png_free_data(), as in version 1.0.5.
855 Added png_set_invalid() function.
856 Fixed incorrect illustrations of png_destroy_write_struct() in example.c.
857
858Version 1.0.7beta15 [May 30, 2000]
859 Revised the deliberately erroneous Linux setjmp code in pngconf.h to produce
860 fewer error messages.
861 Rearranged checks for Z_OK to check the most likely path first in pngpread.c
862 and pngwutil.c.
863 Added checks in pngtest.c for png_create_*() returning NULL, and mentioned
864 in libpng.txt/libpng.3 the need for applications to check this.
865 Changed names of png_default_*() functions in pngtest to pngtest_*().
866 Changed return type of png_get_x|y_offset_*() from png_uint_32 to png_int_32.
867 Fixed some bugs in the unused PNG_INCH_CONVERSIONS functions in pngget.c
868 Set each pointer to NULL after freeing it in png_free_data().
869 Worked around a problem in pngconf.h; AIX's strings.h defines an "index"
870 macro that conflicts with libpng's png_color_16.index. (Dimitri
871 Papadapoulos)
872 Added "msvc" directory with MSVC++ project files (Simon-Pierre Cadieux).
873
874Version 1.0.7beta16 [June 4, 2000]
875 Revised the workaround of AIX string.h "index" bug.
876 Added a check for overlength PLTE chunk in pngrutil.c.
877 Added PNG_NO_POINTER_INDEXING macro to use array-indexing instead of pointer
878 indexing in pngrutil.c and pngwutil.c to accommodate a buggy compiler.
879 Added a warning in png_decompress_chunk() when it runs out of data, e.g.
880 when it tries to read an erroneous PhotoShop iCCP chunk.
881 Added PNG_USE_DLL macro.
882 Revised the copyright/disclaimer/license notice.
883 Added contrib/msvctest directory
884
885Version 1.0.7rc1 [June 9, 2000]
886 Corrected the definition of PNG_TRANSFORM_INVERT_ALPHA (0x0400 not 0x0200)
887 Added contrib/visupng directory (Willem van Schaik)
888
889Version 1.0.7beta18 [June 23, 2000]
890 Revised PNGAPI definition, and pngvcrd.c to work with __GCC__
891 and do not redefine PNGAPI if it is passed in via a compiler directive.
892 Revised visupng/PngFile.c to remove returns from within the Try block.
893 Removed leading underscores from "_PNG_H" and "_PNG_SAVE_BSD_SOURCE" macros.
894 Updated contrib/visupng/cexcept.h to version 1.0.0.
895 Fixed bugs in pngwrite.c and pngwutil.c that prevented writing iCCP chunks.
896
897Version 1.0.7rc2 [June 28, 2000]
898 Updated license to include disclaimers required by UCITA.
899 Fixed "DJBPP" typo in pnggccrd.c introduced in beta18.
900
901Version 1.0.7 [July 1, 2000]
902 Revised the definition of "trans_values" in libpng.3/libpng.txt
903
904Version 1.0.8beta1 [July 8, 2000]
905 Added png_free(png_ptr, key) two places in pngpread.c to stop memory leaks.
906 Changed PNG_NO_STDIO to PNG_NO_CONSOLE_IO, several places in pngrutil.c and
907 pngwutil.c.
908 Changed PNG_EXPORT_VAR to use PNG_IMPEXP, in pngconf.h.
909 Removed unused "#include <assert.h>" from png.c
910 Added WindowsCE support.
911 Revised pnggccrd.c to work with gcc-2.95.2 and in the Cygwin environment.
912
913Version 1.0.8beta2 [July 10, 2000]
914 Added project files to the wince directory and made further revisions
915 of pngtest.c, pngrio.c, and pngwio.c in support of WindowsCE.
916
917Version 1.0.8beta3 [July 11, 2000]
918 Only set the PNG_FLAG_FREE_TRNS or PNG_FREE_TRNS flag in png_handle_tRNS()
919 for indexed-color input files to avoid potential double-freeing trans array
920 under some unusual conditions; problem was introduced in version 1.0.6f.
921 Further revisions to pngtest.c and files in the wince subdirectory.
922
923Version 1.0.8beta4 [July 14, 2000]
924 Added the files pngbar.png and pngbar.jpg to the distribution.
925 Added makefile.cygwin, and cygwin support in pngconf.h
926 Added PNG_NO_ZALLOC_ZERO macro (makes png_zalloc skip zeroing memory)
927
928Version 1.0.8rc1 [July 16, 2000]
929 Revised png_debug() macros and statements to eliminate compiler warnings.
930
931Version 1.0.8 [July 24, 2000]
932 Added png_flush() in pngwrite.c, after png_write_IEND().
933 Updated makefile.hpux to build a shared library.
934
935Version 1.0.9beta1 [November 10, 2000]
936 Fixed typo in scripts/makefile.hpux
937 Updated makevms.com in scripts and contrib/* and contrib/* (Martin Zinser)
938 Fixed seqence-point bug in contrib/pngminus/png2pnm (Martin Zinser)
939 Changed "cdrom.com" in documentation to "libpng.org"
940 Revised pnggccrd.c to get it all working, and updated makefile.gcmmx (Greg).
941 Changed type of "params" from voidp to png_voidp in png_read|write_png().
942 Make sure PNGAPI and PNG_IMPEXP are defined in pngconf.h.
943 Revised the 3 instances of WRITEFILE in pngtest.c.
944 Relocated "msvc" and "wince" project subdirectories into "dll" subdirectory.
945 Updated png.rc in dll/msvc project
946 Revised makefile.dec to define and use LIBPATH and INCPATH
947 Increased size of global png_libpng_ver[] array from 12 to 18 chars.
948 Made global png_libpng_ver[], png_sig[] and png_pass_*[] arrays const.
949 Removed duplicate png_crc_finish() from png_handle_bKGD() function.
950 Added a warning when application calls png_read_update_info() multiple times.
951 Revised makefile.cygwin
952 Fixed bugs in iCCP support in pngrutil.c and pngwutil.c.
953 Replaced png_set_empty_plte_permitted() with png_permit_mng_features().
954
955Version 1.0.9beta2 [November 19, 2000]
956 Renamed the "dll" subdirectory "projects".
957 Added borland project files to "projects" subdirectory.
958 Set VS_FF_PRERELEASE and VS_FF_PATCHED flags in msvc/png.rc when appropriate.
959 Add error message in png_set_compression_buffer_size() when malloc fails.
960
961Version 1.0.9beta3 [November 23, 2000]
962 Revised PNG_LIBPNG_BUILD_TYPE macro in png.h, used in the msvc project.
963 Removed the png_flush() in pngwrite.c that crashes some applications
964 that don't set png_output_flush_fn.
965 Added makefile.macosx and makefile.aix to scripts directory.
966
967Version 1.0.9beta4 [December 1, 2000]
968 Change png_chunk_warning to png_warning in png_check_keyword().
969 Increased the first part of msg buffer from 16 to 18 in png_chunk_error().
970
971Version 1.0.9beta5 [December 15, 2000]
972 Added support for filter method 64 (for PNG datastreams embedded in MNG).
973
974Version 1.0.9beta6 [December 18, 2000]
975 Revised png_set_filter() to accept filter method 64 when appropriate.
976 Added new PNG_HAVE_PNG_SIGNATURE bit to png_ptr->mode and use it to
977 help prevent applications from using MNG features in PNG datastreams.
978 Added png_permit_mng_features() function.
979 Revised libpng.3/libpng.txt. Changed "filter type" to "filter method".
980
981Version 1.0.9rc1 [December 23, 2000]
982 Revised test for PNG_HAVE_PNG_SIGNATURE in pngrutil.c
983 Fixed error handling of unknown compression type in png_decompress_chunk().
984 In pngconf.h, define __cdecl when _MSC_VER is defined.
985
986Version 1.0.9beta7 [December 28, 2000]
987 Changed PNG_TEXT_COMPRESSION_zTXt to PNG_COMPRESSION_TYPE_BASE several places.
988 Revised memory management in png_set_hIST and png_handle_hIST in a backward
989 compatible manner. PLTE and tRNS were revised similarly.
990 Revised the iCCP chunk reader to ignore trailing garbage.
991
992Version 1.0.9beta8 [January 12, 2001]
993 Moved pngasmrd.h into pngconf.h.
994 Improved handling of out-of-spec garbage iCCP chunks generated by PhotoShop.
995
996Version 1.0.9beta9 [January 15, 2001]
997 Added png_set_invalid, png_permit_mng_features, and png_mmx_supported to
998 wince and msvc project module definition files.
999 Minor revision of makefile.cygwin.
1000 Fixed bug with progressive reading of narrow interlaced images in pngpread.c
1001
1002Version 1.0.9beta10 [January 16, 2001]
1003 Do not typedef png_FILE_p in pngconf.h when PNG_NO_STDIO is defined.
1004 Fixed "png_mmx_supported" typo in project definition files.
1005
1006Version 1.0.9beta11 [January 19, 2001]
1007 Updated makefile.sgi to make shared library.
1008 Removed png_mmx_support() function and disabled PNG_MNG_FEATURES_SUPPORTED
1009 by default, for the benefit of DLL forward compatibility. These will
1010 be re-enabled in version 1.2.0.
1011
1012Version 1.0.9rc2 [January 22, 2001]
1013 Revised cygwin support.
1014
1015Version 1.0.9 [January 31, 2001]
1016 Added check of cygwin's ALL_STATIC in pngconf.h
1017 Added "-nommx" parameter to contrib/gregbook/rpng2-win and rpng2-x demos.
1018
1019Version 1.0.10beta1 [March 14, 2001]
1020 Revised makefile.dec, makefile.sgi, and makefile.sggcc; added makefile.hpgcc.
1021 Reformatted libpng.3 to eliminate bad line breaks.
1022 Added checks for _mmx_supported in the read_filter_row function of pnggccrd.c
1023 Added prototype for png_mmx_support() near the top of pnggccrd.c
1024 Moved some error checking from png_handle_IHDR to png_set_IHDR.
1025 Added PNG_NO_READ_SUPPORTED and PNG_NO_WRITE_SUPPORTED macros.
1026 Revised png_mmx_support() function in pnggccrd.c
1027 Restored version 1.0.8 PNG_WRITE_EMPTY_PLTE_SUPPORTED behavior in pngwutil.c
1028 Fixed memory leak in contrib/visupng/PngFile.c
1029 Fixed bugs in png_combine_row() in pnggccrd.c and pngvcrd.c (C version)
1030 Added warnings when retrieving or setting gamma=0.
1031 Increased the first part of msg buffer from 16 to 18 in png_chunk_warning().
1032
1033Version 1.0.10rc1 [March 23, 2001]
1034 Changed all instances of memcpy, strcpy, and strlen to png_memcpy, png_strcpy,
1035 and png_strlen.
1036 Revised png_mmx_supported() function in pnggccrd.c to return proper value.
1037 Fixed bug in progressive reading (pngpread.c) with small images (height < 8).
1038
1039Version 1.0.10 [March 30, 2001]
1040 Deleted extraneous space (introduced in 1.0.9) from line 42 of makefile.cygwin
1041 Added beos project files (Chris Herborth)
1042
1043Version 1.0.11beta1 [April 3, 2001]
1044 Added type casts on several png_malloc() calls (Dimitri Papadapoulos).
1045 Removed a no-longer needed AIX work-around from pngconf.h
1046 Changed several "//" single-line comments to C-style in pnggccrd.c
1047
1048Version 1.0.11beta2 [April 11, 2001]
1049 Removed PNGAPI from several functions whose prototypes did not have PNGAPI.
1050 Updated scripts/pngos2.def
1051
1052Version 1.0.11beta3 [April 14, 2001]
1053 Added checking the results of many instances of png_malloc() for NULL
1054
1055Version 1.0.11beta4 [April 20, 2001]
1056 Undid the changes from version 1.0.11beta3. Added a check for NULL return
1057 from user's malloc_fn().
1058 Removed some useless type casts of the NULL pointer.
1059 Added makefile.netbsd
1060
1061Version 1.0.11 [April 27, 2001]
1062 Revised makefile.netbsd
1063
1064Version 1.0.12beta1 [May 14, 2001]
1065 Test for Windows platform in pngconf.h when including malloc.h (Emmanuel Blot)
1066 Updated makefile.cygwin and handling of Cygwin's ALL_STATIC in pngconf.h
1067 Added some never-to-be-executed code in pnggccrd.c to quiet compiler warnings.
1068 Eliminated the png_error about apps using png_read|write_init(). Instead,
1069 libpng will reallocate the png_struct and info_struct if they are too small.
1070 This retains future binary compatibility for old applications written for
1071 libpng-0.88 and earlier.
1072
1073Version 1.2.0beta1 [May 6, 2001]
1074 Bumped DLLNUM to 2.
1075 Re-enabled PNG_MNG_FEATURES_SUPPORTED and enabled PNG_ASSEMBLER_CODE_SUPPORTED
1076 by default.
1077 Added runtime selection of MMX features.
1078 Added png_set_strip_error_numbers function and related macros.
1079
1080Version 1.2.0beta2 [May 7, 2001]
1081 Finished merging 1.2.0beta1 with version 1.0.11
1082 Added a check for attempts to read or write PLTE in grayscale PNG datastreams.
1083
1084Version 1.2.0beta3 [May 17, 2001]
1085 Enabled user memory function by default.
1086 Modified png_create_struct so it passes user mem_ptr to user memory allocator.
1087 Increased png_mng_features flag from png_byte to png_uint_32.
1088 Bumped shared-library (so-number) and dll-number to 3.
1089
1090Version 1.2.0beta4 [June 23, 2001]
1091 Check for missing profile length field in iCCP chunk and free chunk_data
1092 in case of truncated iCCP chunk.
1093 Bumped shared-library number to 3 in makefile.sgi and makefile.sggcc
1094 Bumped dll-number from 2 to 3 in makefile.cygwin
1095 Revised contrib/gregbook/rpng*-x.c to avoid a memory leak and to exit cleanly
1096 if user attempts to run it on an 8-bit display.
1097 Updated contrib/gregbook
1098 Use png_malloc instead of png_zalloc to allocate palette in pngset.c
1099 Updated makefile.ibmc
1100 Added some typecasts to eliminate gcc 3.0 warnings. Changed prototypes
1101 of png_write_oFFS width and height from png_uint_32 to png_int_32.
1102 Updated example.c
1103 Revised prototypes for png_debug_malloc and png_debug_free in pngtest.c
1104
1105Version 1.2.0beta5 [August 8, 2001]
1106 Revised contrib/gregbook
1107 Revised makefile.gcmmx
1108 Revised pnggccrd.c to conditionally compile some thread-unsafe code only
1109 when PNG_THREAD_UNSAFE_OK is defined.
1110 Added tests to prevent pngwutil.c from writing a bKGD or tRNS chunk with
1111 value exceeding 2^bit_depth-1
1112 Revised makefile.sgi and makefile.sggcc
1113 Replaced calls to fprintf(stderr,...) with png_warning() in pnggccrd.c
1114 Removed restriction that do_invert_mono only operate on 1-bit opaque files
1115
1116Version 1.2.0 [September 1, 2001]
1117 Changed a png_warning() to png_debug() in pnggccrd.c
1118 Fixed contrib/gregbook/rpng-x.c, rpng2-x.c to avoid crash with XFreeGC().
1119
1120Version 1.2.1beta1 [October 19, 2001]
1121 Revised makefile.std in contrib/pngminus
1122 Include background_1 in png_struct regardless of gamma support.
1123 Revised makefile.netbsd and makefile.macosx, added makefile.darwin.
1124 Revised example.c to provide more details about using row_callback().
1125
1126Version 1.2.1beta2 [October 25, 2001]
1127 Added type cast to each NULL appearing in a function call, except for
1128 WINCE functions.
1129 Added makefile.so9.
1130
1131Version 1.2.1beta3 [October 27, 2001]
1132 Removed type casts from all NULLs.
1133 Simplified png_create_struct_2().
1134
1135Version 1.2.1beta4 [November 7, 2001]
1136 Revised png_create_info_struct() and png_creat_struct_2().
1137 Added error message if png_write_info() was omitted.
1138 Type cast NULLs appearing in function calls when _NO_PROTO or
1139 PNG_TYPECAST_NULL is defined.
1140
1141Version 1.2.1rc1 [November 24, 2001]
1142 Type cast NULLs appearing in function calls except when PNG_NO_TYPECAST_NULL
1143 is defined.
1144 Changed typecast of "size" argument to png_size_t in pngmem.c calls to
1145 the user malloc_fn, to agree with the prototype in png.h
1146 Added a pop/push operation to pnggccrd.c, to preserve Eflag (Maxim Sobolev)
1147 Updated makefile.sgi to recognize LIBPATH and INCPATH.
1148 Updated various makefiles so "make clean" does not remove previous major
1149 version of the shared library.
1150
1151Version 1.2.1rc2 [December 4, 2001]
1152 Always allocate 256-entry internal palette, hist, and trans arrays, to
1153 avoid out-of-bounds memory reference caused by invalid PNG datastreams.
1154 Added a check for prefix_length > data_length in iCCP chunk handler.
1155
1156Version 1.2.1 [December 7, 2001]
1157 None.
1158
1159Version 1.2.2beta1 [February 22, 2002]
1160 Fixed a bug with reading the length of iCCP profiles (Larry Reeves).
1161 Revised makefile.linux, makefile.gcmmx, and makefile.sgi to generate
1162 libpng.a, libpng12.so (not libpng.so.3), and libpng12/png.h
1163 Revised makefile.darwin to remove "-undefined suppress" option.
1164 Added checks for gamma and chromaticity values over 21474.83, which exceed
1165 the limit for PNG unsigned 32-bit integers when encoded.
1166 Revised calls to png_create_read_struct() and png_create_write_struct()
1167 for simpler debugging.
1168 Revised png_zalloc() so zlib handles errors (uses PNG_FLAG_MALLOC_NULL_MEM_OK)
1169
1170Version 1.2.2beta2 [February 23, 2002]
1171 Check chunk_length and idat_size for invalid (over PNG_MAX_UINT) lengths.
1172 Check for invalid image dimensions in png_get_IHDR.
1173 Added missing "fi;" in the install target of the SGI makefiles.
1174 Added install-static to all makefiles that make shared libraries.
1175 Always do gamma compensation when image is partially transparent.
1176
1177Version 1.2.2beta3 [March 7, 2002]
1178 Compute background.gray and background_1.gray even when color_type is RGB
1179 in case image gets reduced to gray later.
1180 Modified shared-library makefiles to install pkgconfig/libpngNN.pc.
1181 Export (with PNGAPI) png_zalloc, png_zfree, and png_handle_as_unknown
1182 Removed unused png_write_destroy_info prototype from png.h
1183 Eliminated incorrect use of width_mmx from pnggccrd.c in pixel_bytes == 8 case
1184 Added install-shared target to all makefiles that make shared libraries.
1185 Stopped a double free of palette, hist, and trans when not using free_me.
1186 Added makefile.32sunu for Sun Ultra 32 and makefile.64sunu for Sun Ultra 64.
1187
1188Version 1.2.2beta4 [March 8, 2002]
1189 Compute background.gray and background_1.gray even when color_type is RGB
1190 in case image gets reduced to gray later (Jason Summers).
1191 Relocated a misplaced /bin/rm in the "install-shared" makefile targets
1192 Added PNG_1_0_X macro which can be used to build a 1.0.x-compatible library.
1193
1194Version 1.2.2beta5 [March 26, 2002]
1195 Added missing PNGAPI to several function definitions.
1196 Check for invalid bit_depth or color_type in png_get_IHDR(), and
1197 check for missing PLTE or IHDR in png_push_read_chunk() (Matthias Clasen).
1198 Revised iTXt support to accept NULL for lang and lang_key.
1199 Compute gamma for color components of background even when color_type is gray.
1200 Changed "()" to "{}" in scripts/libpng.pc.in.
1201 Revised makefiles to put png.h and pngconf.h only in $prefix/include/libpngNN
1202 Revised makefiles to make symlink to libpng.so.NN in addition to libpngNN.so
1203
1204Version 1.2.2beta6 [March 31, 2002]
1205
1206Version 1.0.13beta1 [March 31, 2002]
1207 Prevent png_zalloc() from trying to memset memory that it failed to acquire.
1208 Add typecasts of PNG_MAX_UINT in pngset_cHRM_fixed() (Matt Holgate).
1209 Ensure that the right function (user or default) is used to free the
1210 png_struct after an error in png_create_read_struct_2().
1211
1212Version 1.2.2rc1 [April 7, 2002]
1213
1214Version 1.0.13rc1 [April 7, 2002]
1215 Save the ebx register in pnggccrd.c (Sami Farin)
1216 Add "mem_ptr = png_ptr->mem_ptr" in png_destroy_write_struct() (Paul Gardner).
1217 Updated makefiles to put headers in include/libpng and remove old include/*.h.
1218
1219Version 1.2.2 [April 15, 2002]
1220
1221Version 1.0.13 [April 15, 2002]
1222 Revised description of png_set_filter() in libpng.3/libpng.txt.
1223 Revised makefile.netbsd and added makefile.neNNbsd and makefile.freebsd
1224
1225Version 1.0.13patch01 [April 17, 2002]
1226
1227Version 1.2.2patch01 [April 17, 2002]
1228 Changed ${PNGMAJ}.${PNGVER} bug to ${PNGVER} in makefile.sgi and
1229 makefile.sggcc
1230 Fixed VER -> PNGVER typo in makefile.macosx and added install-static to
1231 install
1232 Added install: target to makefile.32sunu and makefile.64sunu
1233
1234Version 1.0.13patch03 [April 18, 2002]
1235
1236Version 1.2.2patch03 [April 18, 2002]
1237 Revised 15 makefiles to link libpng.a to libpngNN.a and the include libpng
1238 subdirectory to libpngNN subdirectory without the full pathname.
1239 Moved generation of libpng.pc from "install" to "all" in 15 makefiles.
1240
1241Version 1.2.3rc1 [April 28, 2002]
1242 Added install-man target to 15 makefiles (Dimitri Papadopolous-Orfanos).
1243 Added $(DESTDIR) feature to 24 makefiles (Tim Mooney)
1244 Fixed bug with $prefix, should be $(prefix) in makefile.hpux.
1245 Updated cygwin-specific portion of pngconf.h and revised makefile.cygwin
1246 Added a link from libpngNN.pc to libpng.pc in 15 makefiles.
1247 Added links from include/libpngNN/*.h to include/*.h in 24 makefiles.
1248 Revised makefile.darwin to make relative links without full pathname.
1249 Added setjmp() at the end of png_create_*_struct_2() in case user forgets
1250 to put one in their application.
1251 Restored png_zalloc() and png_zfree() prototypes to version 1.2.1 and
1252 removed them from module definition files.
1253
1254Version 1.2.3rc2 [May 1, 2002]
1255 Fixed bug in reporting number of channels in pngget.c and pngset.c,
1256 that was introduced in version 1.2.2beta5.
1257 Exported png_zalloc(), png_zfree(), png_default_read(), png_default_write(),
1258 png_default_flush(), and png_push_fill_buffer() and included them in
1259 module definition files.
1260 Added "libpng.pc" dependency to the "install-shared" target in 15 makefiles.
1261
1262Version 1.2.3rc3 [May 1, 2002]
1263 Revised prototype for png_default_flush()
1264 Remove old libpng.pc and libpngNN.pc before installing new ones.
1265
1266Version 1.2.3rc4 [May 2, 2002]
1267 Typos in *.def files (png_default_read|write -> png_default_read|write_data)
1268 In makefiles, changed rm libpng.NN.pc to rm libpngNN.pc
1269 Added libpng-config and libpngNN-config and modified makefiles to install
1270 them.
1271 Changed $(MANPATH) to $(DESTDIR)$(MANPATH) in makefiles
1272 Added "Win32 DLL VB" configuration to projects/msvc/libpng.dsp
1273
1274Version 1.2.3rc5 [May 11, 2002]
1275 Changed "error" and "message" in prototypes to "error_message" and
1276 "warning_message" to avoid namespace conflict.
1277 Revised 15 makefiles to build libpng-config from libpng-config-*.in
1278 Once more restored png_zalloc and png_zfree to regular nonexported form.
1279 Restored png_default_read|write_data, png_default_flush, png_read_fill_buffer
1280 to nonexported form, but with PNGAPI, and removed them from module def
1281 files.
1282
1283Version 1.2.3rc6 [May 14, 2002]
1284 Removed "PNGAPI" from png_zalloc() and png_zfree() in png.c
1285 Changed "Gz" to "Gd" in projects/msvc/libpng.dsp and zlib.dsp.
1286 Removed leftover libpng-config "sed" script from four makefiles.
1287 Revised libpng-config creating script in 16 makefiles.
1288
1289Version 1.2.3 [May 22, 2002]
1290 Revised libpng-config target in makefile.cygwin.
1291 Removed description of png_set_mem_fn() from documentation.
1292 Revised makefile.freebsd.
1293 Minor cosmetic changes to 15 makefiles, e.g., $(DI) = $(DESTDIR)/$(INCDIR).
1294 Revised projects/msvc/README.txt
1295 Changed -lpng to -lpngNN in LDFLAGS in several makefiles.
1296
1297Version 1.2.4beta1 [May 24, 2002]
1298 Added libpng.pc and libpng-config to "all:" target in 16 makefiles.
1299 Fixed bug in 16 makefiles: $(DESTDIR)/$(LIBPATH) to $(DESTDIR)$(LIBPATH)
1300 Added missing "\" before closing double quote in makefile.gcmmx.
1301 Plugged various memory leaks; added png_malloc_warn() and png_set_text_2()
1302 functions.
1303
1304Version 1.2.4beta2 [June 25, 2002]
1305 Plugged memory leak of png_ptr->current_text (Matt Holgate).
1306 Check for buffer overflow before reading CRC in pngpread.c (Warwick Allison)
1307 Added -soname to the loader flags in makefile.dec, makefile.sgi, and
1308 makefile.sggcc.
1309 Added "test-installed" target to makefile.linux, makefile.gcmmx,
1310 makefile.sgi, and makefile.sggcc.
1311
1312Version 1.2.4beta3 [June 28, 2002]
1313 Plugged memory leak of row_buf in pngtest.c when there is a png_error().
1314 Detect buffer overflow in pngpread.c when IDAT is corrupted with extra data.
1315 Added "test-installed" target to makefile.32sunu, makefile.64sunu,
1316 makefile.beos, makefile.darwin, makefile.dec, makefile.macosx,
1317 makefile.solaris, makefile.hpux, makefile.hpgcc, and makefile.so9.
1318
1319Version 1.2.4rc1 and 1.0.14rc1 [July 2, 2002]
1320 Added "test-installed" target to makefile.cygwin and makefile.sco.
1321 Revised pnggccrd.c to be able to back out version 1.0.x via PNG_1_0_X macro.
1322
1323Version 1.2.4 and 1.0.14 [July 8, 2002]
1324 Changed png_warning() to png_error() when width is too large to process.
1325
1326Version 1.2.4patch01 [July 20, 2002]
1327 Revised makefile.cygwin to use DLL number 12 instead of 13.
1328
1329Version 1.2.5beta1 [August 6, 2002]
1330 Added code to contrib/gregbook/readpng2.c to ignore unused chunks.
1331 Replaced toucan.png in contrib/gregbook (it has been corrupt since 1.0.11)
1332 Removed some stray *.o files from contrib/gregbook.
1333 Changed png_error() to png_warning() about "Too much data" in pngpread.c
1334 and about "Extra compressed data" in pngrutil.c.
1335 Prevent png_ptr->pass from exceeding 7 in png_push_finish_row().
1336 Updated makefile.hpgcc
1337 Updated png.c and pnggccrd.c handling of return from png_mmx_support()
1338
1339Version 1.2.5beta2 [August 15, 2002]
1340 Only issue png_warning() about "Too much data" in pngpread.c when avail_in
1341 is nonzero.
1342 Updated makefiles to install a separate libpng.so.3 with its own rpath.
1343
1344Version 1.2.5rc1 and 1.0.15rc1 [August 24, 2002]
1345 Revised makefiles to not remove previous minor versions of shared libraries.
1346
1347Version 1.2.5rc2 and 1.0.15rc2 [September 16, 2002]
1348 Revised 13 makefiles to remove "-lz" and "-L$(ZLIBLIB)", etc., from shared
1349 library loader directive.
1350 Added missing "$OBJSDLL" line to makefile.gcmmx.
1351 Added missing "; fi" to makefile.32sunu.
1352
1353Version 1.2.5rc3 and 1.0.15rc3 [September 18, 2002]
1354 Revised libpng-config script.
1355
1356Version 1.2.5 and 1.0.15 [October 3, 2002]
1357 Revised makefile.macosx, makefile.darwin, makefile.hpgcc, and makefile.hpux,
1358 and makefile.aix.
1359 Relocated two misplaced PNGAPI lines in pngtest.c
1360
1361Version 1.2.6beta1 [October 22, 2002]
1362 Commented out warning about uninitialized mmx_support in pnggccrd.c.
1363 Changed "IBMCPP__" flag to "__IBMCPP__" in pngconf.h.
1364 Relocated two more misplaced PNGAPI lines in pngtest.c
1365 Fixed memory overrun bug in png_do_read_filler() with 16-bit datastreams,
1366 introduced in version 1.0.2.
1367 Revised makefile.macosx, makefile.dec, makefile.aix, and makefile.32sunu.
1368
1369Version 1.2.6beta2 [November 1, 2002]
1370 Added libpng-config "--ldopts" output.
1371 Added "AR=ar" and "ARFLAGS=rc" and changed "ar rc" to "$(AR) $(ARFLAGS)"
1372 in makefiles.
1373
1374Version 1.2.6beta3 [July 18, 2004]
1375 Reverted makefile changes from version 1.2.6beta2 and some of the changes
1376 from version 1.2.6beta1; these will be postponed until version 1.2.7.
1377 Version 1.2.6 is going to be a simple bugfix release.
1378 Changed the one instance of "ln -sf" to "ln -f -s" in each Sun makefile.
1379 Fixed potential overrun in pngerror.c by using strncpy instead of memcpy.
1380 Added "#!/bin/sh" at the top of configure, for recognition of the
1381 'x' flag under Cygwin (Cosmin).
1382 Optimized vacuous tests that silence compiler warnings, in png.c (Cosmin).
1383 Added support for PNG_USER_CONFIG, in pngconf.h (Cosmin).
1384 Fixed the special memory handler for Borland C under DOS, in pngmem.c
1385 (Cosmin).
1386 Removed some spurious assignments in pngrutil.c (Cosmin).
1387 Replaced 65536 with 65536L, and 0xffff with 0xffffL, to silence warnings
1388 on 16-bit platforms (Cosmin).
1389 Enclosed shift op expressions in parentheses, to silence warnings (Cosmin).
1390 Used proper type png_fixed_point, to avoid problems on 16-bit platforms,
1391 in png_handle_sRGB() (Cosmin).
1392 Added compression_type to png_struct, and optimized the window size
1393 inside the deflate stream (Cosmin).
1394 Fixed definition of isnonalpha(), in pngerror.c and pngrutil.c (Cosmin).
1395 Fixed handling of unknown chunks that come after IDAT (Cosmin).
1396 Allowed png_error() and png_warning() to work even if png_ptr == NULL
1397 (Cosmin).
1398 Replaced row_info->rowbytes with row_bytes in png_write_find_filter()
1399 (Cosmin).
1400 Fixed definition of PNG_LIBPNG_VER_DLLNUM (Simon-Pierre).
1401 Used PNG_LIBPNG_VER and PNG_LIBPNG_VER_STRING instead of the hardcoded
1402 values in png.c (Simon-Pierre, Cosmin).
1403 Initialized png_libpng_ver[] with PNG_LIBPNG_VER_STRING (Simon-Pierre).
1404 Replaced PNG_LIBPNG_VER_MAJOR with PNG_LIBPNG_VER_DLLNUM in png.rc
1405 (Simon-Pierre).
1406 Moved the definition of PNG_HEADER_VERSION_STRING near the definitions
1407 of the other PNG_LIBPNG_VER_... symbols in png.h (Cosmin).
1408 Relocated #ifndef PNGAPI guards in pngconf.h (Simon-Pierre, Cosmin).
1409 Updated scripts/makefile.vc(a)win32 (Cosmin).
1410 Updated the MSVC project (Simon-Pierre, Cosmin).
1411 Updated the Borland C++ Builder project (Cosmin).
1412 Avoided access to asm_flags in pngvcrd.c, if PNG_1_0_X is defined (Cosmin).
1413 Commented out warning about uninitialized mmx_support in pngvcrd.c (Cosmin).
1414 Removed scripts/makefile.bd32 and scripts/pngdef.pas (Cosmin).
1415 Added extra guard around inclusion of Turbo C memory headers, in pngconf.h
1416 (Cosmin).
1417 Renamed projects/msvc/ to projects/visualc6/, and projects/borland/ to
1418 projects/cbuilder5/ (Cosmin).
1419 Moved projects/visualc6/png32ms.def to scripts/pngw32.def,
1420 and projects/visualc6/png.rc to scripts/pngw32.rc (Cosmin).
1421 Added projects/visualc6/pngtest.dsp; removed contrib/msvctest/ (Cosmin).
1422 Changed line endings to DOS style in cbuilder5 and visualc6 files, even
1423 in the tar.* distributions (Cosmin).
1424 Updated contrib/visupng/VisualPng.dsp (Cosmin).
1425 Updated contrib/visupng/cexcept.h to version 2.0.0 (Cosmin).
1426 Added a separate distribution with "configure" and supporting files (Junichi).
1427
1428Version 1.2.6beta4 [July 28, 2004]
1429 Added user ability to change png_size_t via a PNG_SIZE_T macro.
1430 Added png_sizeof() and png_convert_size() functions.
1431 Added PNG_SIZE_MAX (maximum value of a png_size_t variable.
1432 Added check in png_malloc_default() for (size_t)size != (png_uint_32)size
1433 which would indicate an overflow.
1434 Changed sPLT failure action from png_error to png_warning and abandon chunk.
1435 Changed sCAL and iCCP failures from png_error to png_warning and abandon.
1436 Added png_get_uint_31(png_ptr, buf) function.
1437 Added PNG_UINT_32_MAX macro.
1438 Renamed PNG_MAX_UINT to PNG_UINT_31_MAX.
1439 Made png_zalloc() issue a png_warning and return NULL on potential
1440 overflow.
1441 Turn on PNG_NO_ZALLOC_ZERO by default in version 1.2.x
1442 Revised "clobber list" in pnggccrd.c so it will compile under gcc-3.4.
1443 Revised Borland portion of png_malloc() to return NULL or issue
1444 png_error() according to setting of PNG_FLAG_MALLOC_NULL_MEM_OK.
1445 Added PNG_NO_SEQUENTIAL_READ_SUPPORTED macro to conditionally remove
1446 sequential read support.
1447 Added some "#if PNG_WRITE_SUPPORTED" blocks.
1448 Added #ifdef to remove some redundancy in png_malloc_default().
1449 Use png_malloc instead of png_zalloc to allocate the pallete.
1450
1451Version 1.0.16rc1 and 1.2.6rc1 [August 4, 2004]
1452 Fixed buffer overflow vulnerability in png_handle_tRNS()
1453 Fixed integer arithmetic overflow vulnerability in png_read_png().
1454 Fixed some harmless bugs in png_handle_sBIT, etc, that would cause
1455 duplicate chunk types to go undetected.
1456 Fixed some timestamps in the -config version
1457 Rearranged order of processing of color types in png_handle_tRNS().
1458 Added ROWBYTES macro to calculate rowbytes without integer overflow.
1459 Updated makefile.darwin and removed makefile.macosx from scripts directory.
1460 Imposed default one million column, one-million row limits on the image
1461 dimensions, and added png_set_user_limits() function to override them.
1462 Revised use of PNG_SET_USER_LIMITS_SUPPORTED macro.
1463 Fixed wrong cast of returns from png_get_user_width|height_max().
1464 Changed some "keep the compiler happy" from empty statements to returns,
1465 Revised libpng.txt to remove 1.2.x stuff from the 1.0.x distribution
1466
1467Version 1.0.16rc2 and 1.2.6rc2 [August 7, 2004]
1468 Revised makefile.darwin and makefile.solaris. Removed makefile.macosx.
1469 Revised pngtest's png_debug_malloc() to use png_malloc() instead of
1470 png_malloc_default() which is not supposed to be exported.
1471 Fixed off-by-one error in one of the conversions to PNG_ROWBYTES() in
1472 pngpread.c. Bug was introduced in 1.2.6rc1.
1473 Fixed bug in RGB to RGBX transformation introduced in 1.2.6rc1.
1474 Fixed old bug in RGB to Gray transformation.
1475 Fixed problem with 64-bit compilers by casting arguments to abs()
1476 to png_int_32.
1477 Changed "ln -sf" to "ln -f -s" in three makefiles (solaris, sco, so9).
1478 Changed "HANDLE_CHUNK_*" to "PNG_HANDLE_CHUNK_*" (Cosmin)
1479 Added "-@/bin/rm -f $(DL)/$(LIBNAME).so.$(PNGMAJ)" to 15 *NIX makefiles.
1480 Added code to update the row_info->colortype in png_do_read_filler() (MSB).
1481
1482Version 1.0.16rc3 and 1.2.6rc3 [August 9, 2004]
1483 Eliminated use of "abs()" in testing cHRM and gAMA values, to avoid
1484 trouble with some 64-bit compilers. Created PNG_OUT_OF_RANGE() macro.
1485 Revised documentation of png_set_keep_unknown_chunks().
1486 Check handle_as_unknown status in pngpread.c, as in pngread.c previously.
1487 Moved "PNG_HANDLE_CHUNK_*" macros out of PNG_INTERNAL section of png.h
1488 Added "rim" definitions for CONST4 and CONST6 in pnggccrd.c
1489
1490Version 1.0.16rc4 and 1.2.6rc4 [August 10, 2004]
1491 Fixed mistake in pngtest.c introduced in 1.2.6rc2 (declaration of
1492 "pinfo" was out of place).
1493
1494Version 1.0.16rc5 and 1.2.6rc5 [August 10, 2004]
1495 Moved "PNG_HANDLE_CHUNK_*" macros out of PNG_ASSEMBLER_CODE_SUPPORTED
1496 section of png.h where they were inadvertently placed in version rc3.
1497
1498Version 1.2.6 and 1.0.16 [August 15, 2004]
1499 Revised pngtest so memory allocation testing is only done when PNG_DEBUG==1.
1500
1501Version 1.2.7beta1 [August 26, 2004]
1502 Removed unused pngasmrd.h file.
1503 Removed references to uu.net for archived files. Added references to
1504 PNG Spec (second edition) and the PNG ISO/IEC Standard.
1505 Added "test-dd" target in 15 makefiles, to run pngtest in DESTDIR.
1506 Fixed bug with "optimized window size" in the IDAT datastream, that
1507 causes libpng to write PNG files with incorrect zlib header bytes.
1508
1509Version 1.2.7beta2 [August 28, 2004]
1510 Fixed bug with sCAL chunk and big-endian machines (David Munro).
1511 Undid new code added in 1.2.6rc2 to update the color_type in
1512 png_set_filler().
1513 Added png_set_add_alpha() that updates color type.
1514
1515Version 1.0.17rc1 and 1.2.7rc1 [September 4, 2004]
1516 Revised png_set_strip_filler() to not remove alpha if color_type has alpha.
1517
1518Version 1.2.7 and 1.0.17 [September 12, 2004]
1519 Added makefile.hp64
1520 Changed projects/msvc/png32ms.def to scripts/png32ms.def in makefile.cygwin
1521
1522Version 1.2.8beta1 [November 1, 2004]
1523 Fixed bug in png_text_compress() that would fail to complete a large block.
1524 Fixed bug, introduced in libpng-1.2.7, that overruns a buffer during
1525 strip alpha operation in png_do_strip_filler().
1526 Added PNG_1_2_X definition in pngconf.h
1527 Use #ifdef to comment out png_info_init in png.c and png_read_init in
1528 pngread.c (as of 1.3.0)
1529
1530Version 1.2.8beta2 [November 2, 2004]
1531 Reduce color_type to a nonalpha type after strip alpha operation in
1532 png_do_strip_filler().
1533
1534Version 1.2.8beta3 [November 3, 2004]
1535 Revised definitions of PNG_MAX_UINT_32, PNG_MAX_SIZE, and PNG_MAXSUM
1536
1537Version 1.2.8beta4 [November 12, 2004]
1538 Fixed (again) definition of PNG_LIBPNG_VER_DLLNUM in png.h (Cosmin).
1539 Added PNG_LIBPNG_BUILD_PRIVATE in png.h (Cosmin).
1540 Set png_ptr->zstream.data_type to Z_BINARY, to avoid unnecessary detection
1541 of data type in deflate (Cosmin).
1542 Deprecated but continue to support SPECIALBUILD and PRIVATEBUILD in favor of
1543 PNG_LIBPNG_BUILD_SPECIAL_STRING and PNG_LIBPNG_BUILD_PRIVATE_STRING.
1544
1545Version 1.2.8beta5 [November 20, 2004]
1546 Use png_ptr->flags instead of png_ptr->transformations to pass
1547 PNG_STRIP_ALPHA info to png_do_strip_filler(), to preserve ABI
1548 compatibility.
1549 Revised handling of SPECIALBUILD, PRIVATEBUILD,
1550 PNG_LIBPNG_BUILD_SPECIAL_STRING and PNG_LIBPNG_BUILD_PRIVATE_STRING.
1551
1552Version 1.2.8rc1 [November 24, 2004]
1553 Moved handling of BUILD macros from pngconf.h to png.h
1554 Added definition of PNG_LIBPNG_BASE_TYPE in png.h, inadvertently
1555 omitted from beta5.
1556 Revised scripts/pngw32.rc
1557 Despammed mailing addresses by masking "@" with "at".
1558 Inadvertently installed a supposedly faster test version of pngrutil.c
1559
1560Version 1.2.8rc2 [November 26, 2004]
1561 Added two missing "\" in png.h
1562 Change tests in pngread.c and pngpread.c to
1563 if (png_ptr->transformations || (png_ptr->flags&PNG_FLAG_STRIP_ALPHA))
1564 png_do_read_transformations(png_ptr);
1565
1566Version 1.2.8rc3 [November 28, 2004]
1567 Reverted pngrutil.c to version libpng-1.2.8beta5.
1568 Added scripts/makefile.elf with supporting code in pngconf.h for symbol
1569 versioning (John Bowler).
1570
1571Version 1.2.8rc4 [November 29, 2004]
1572 Added projects/visualc7 (Simon-pierre).
1573
1574Version 1.2.8rc5 [November 29, 2004]
1575 Fixed new typo in scripts/pngw32.rc
1576
1577Version 1.2.8 [December 3, 2004]
1578 Removed projects/visualc7, added projects/visualc71.
1579
1580Version 1.2.9beta1 [February 21, 2006]
1581 Initialized some structure members in pngwutil.c to avoid gcc-4.0.0 complaints
1582 Revised man page and libpng.txt to make it clear that one should not call
1583 png_read_end or png_write_end after png_read_png or png_write_png.
1584 Updated references to png-mng-implement mailing list.
1585 Fixed an incorrect typecast in pngrutil.c
1586 Added PNG_NO_READ_SUPPORTED conditional for making a write-only library.
1587 Added PNG_NO_WRITE_INTERLACING_SUPPORTED conditional.
1588 Optimized alpha-inversion loops in pngwtran.c
1589 Moved test for nonzero gamma outside of png_build_gamma_table() in pngrtran.c
1590 Make sure num_trans is <= 256 before copying data in png_set_tRNS().
1591 Make sure num_palette is <= 256 before copying data in png_set_PLTE().
1592 Interchanged order of write_swap_alpha and write_invert_alpha transforms.
1593 Added parentheses in the definition of PNG_LIBPNG_BUILD_TYPE (Cosmin).
1594 Optimized zlib window flag (CINFO) in contrib/pngsuite/*.png (Cosmin).
1595 Updated scripts/makefile.bc32 for Borland C++ 5.6 (Cosmin).
1596 Exported png_get_uint_32, png_save_uint_32, png_get_uint_16, png_save_uint_16,
1597 png_get_int_32, png_save_int_32, png_get_uint_31 (Cosmin).
1598 Added type cast (png_byte) in png_write_sCAL() (Cosmin).
1599 Fixed scripts/makefile.cygwin (Christian Biesinger, Cosmin).
1600 Default iTXt support was inadvertently enabled.
1601
1602Version 1.2.9beta2 [February 21, 2006]
1603 Check for png_rgb_to_gray and png_gray_to_rgb read transformations before
1604 checking for png_read_dither in pngrtran.c
1605 Revised checking of chromaticity limits to accommodate extended RGB
1606 colorspace (John Denker).
1607 Changed line endings in some of the project files to CRLF, even in the
1608 "Unix" tar distributions (Cosmin).
1609 Made png_get_int_32 and png_save_int_32 always available (Cosmin).
1610 Updated scripts/pngos2.def, scripts/pngw32.def and projects/wince/png32ce.def
1611 with the newly exported functions.
1612 Eliminated distributions without the "configure" script.
1613 Updated INSTALL instructions.
1614
1615Version 1.2.9beta3 [February 24, 2006]
1616 Fixed CRCRLF line endings in contrib/visupng/VisualPng.dsp
1617 Made libpng.pc respect EXEC_PREFIX (D. P. Kreil, J. Bowler)
1618 Removed reference to pngasmrd.h from Makefile.am
1619 Renamed CHANGES to ChangeLog.
1620 Renamed LICENSE to COPYING.
1621 Renamed ANNOUNCE to NEWS.
1622 Created AUTHORS file.
1623
1624Version 1.2.9beta4 [March 3, 2006]
1625 Changed definition of PKGCONFIG from $prefix/lib to $libdir in configure.ac
1626 Reverted to filenames LICENSE and ANNOUNCE; removed AUTHORS and COPYING.
1627 Removed newline from the end of some error and warning messages.
1628 Removed test for sqrt() from configure.ac and configure.
1629 Made swap tables in pngtrans.c PNG_CONST (Carlo Bramix).
1630 Disabled default iTXt support that was inadvertently enabled in
1631 libpng-1.2.9beta1.
1632 Added "OS2" to list of systems that don't need underscores, in pnggccrd.c
1633 Removed libpng version and date from *.c files.
1634
1635Version 1.2.9beta5 [March 4, 2006]
1636 Removed trailing blanks from source files.
1637 Put version and date of latest change in each source file, and changed
1638 copyright year accordingly.
1639 More cleanup of configure.ac, Makefile.am, and associated scripts.
1640 Restored scripts/makefile.elf which was inadvertently deleted.
1641
1642Version 1.2.9beta6 [March 6, 2006]
1643 Fixed typo (RELEASE) in configuration files.
1644
1645Version 1.2.9beta7 [March 7, 2006]
1646 Removed libpng.vers and libpng.sym from libpng12_la_SOURCES in Makefile.am
1647 Fixed inconsistent #ifdef's around png_sig_bytes() and png_set_sCAL_s()
1648 in png.h.
1649 Updated makefile.elf as suggested by debian.
1650 Made cosmetic changes to some makefiles, adding LN_SF and other macros.
1651 Made some makefiles accept "exec_prefix".
1652
1653Version 1.2.9beta8 [March 9, 2006]
1654 Fixed some "#if defined (..." which should be "#if defined(..."
1655 Bug introduced in libpng-1.2.8.
1656 Fixed inconsistency in definition of png_default_read_data()
1657 Restored blank that was lost from makefile.sggcc "clean" target in beta7.
1658 Revised calculation of "current" and "major" for irix in ltmain.sh
1659 Changed "mkdir" to "MKDIR_P" in some makefiles.
1660 Separated PNG_EXPAND and PNG_EXPAND_tRNS.
1661 Added png_set_expand_gray_1_2_4_to_8() and deprecated
1662 png_set_gray_1_2_4_to_8() which also expands tRNS to alpha.
1663
1664Version 1.2.9beta9 [March 10, 2006]
1665 Include "config.h" in pngconf.h when available.
1666 Added some checks for NULL png_ptr or NULL info_ptr (timeless)
1667
1668Version 1.2.9beta10 [March 20, 2006]
1669 Removed extra CR from contrib/visualpng/VisualPng.dsw (Cosmin)
1670 Made pnggccrd.c PIC-compliant (Christian Aichinger).
1671 Added makefile.mingw (Wolfgang Glas).
1672 Revised pngconf.h MMX checking.
1673
1674Version 1.2.9beta11 [March 22, 2006]
1675 Fixed out-of-order declaration in pngwrite.c that was introduced in beta9
1676 Simplified some makefiles by using LIBSO, LIBSOMAJ, and LIBSOVER macros.
1677
1678Version 1.2.9rc1 [March 31, 2006]
1679 Defined PNG_USER_PRIVATEBUILD when including "pngusr.h" (Cosmin).
1680 Removed nonsensical assertion check from pngtest.c (Cosmin).
1681
1682Version 1.2.9 [April 14, 2006]
1683 Revised makefile.beos and added "none" selector in ltmain.sh
1684
1685Version 1.2.10beta1 [April 15, 2006]
1686 Renamed "config.h" to "png_conf.h" and revised Makefile.am to add
1687 -DPNG_BUILDING_LIBPNG to compile directive, and modified pngconf.h
1688 to include png_conf.h only when PNG_BUILDING_LIBPNG is defined.
1689
1690Version 1.2.10beta2 [April 15, 2006]
1691 Manually updated Makefile.in and configure. Changed png_conf.h.in
1692 back to config.h.
1693
1694Version 1.2.10beta3 [April 15, 2006]
1695 Change png_conf.h back to config.h in pngconf.h.
1696
1697Version 1.2.10beta4 [April 16, 2006]
1698 Change PNG_BUILDING_LIBPNG to PNG_CONFIGURE_LIBPNG in config/Makefile*.
1699
1700Version 1.2.10beta5 [April 16, 2006]
1701 Added a configure check for compiling assembler code in pnggccrd.c
1702
1703Version 1.2.10beta6 [April 17, 2006]
1704 Revised the configure check for pnggccrd.c
1705 Moved -DPNG_CONFIGURE_LIBPNG into @LIBPNG_DEFINES@
1706 Added @LIBPNG_DEFINES@ to arguments when building libpng.sym
1707
1708Version 1.2.10beta7 [April 18, 2006]
1709 Change "exec_prefix=$prefix" to "exec_prefix=$(prefix)" in makefiles.
1710
1711Version 1.2.10rc1 [April 19, 2006]
1712 Ensure pngconf.h doesn't define both PNG_USE_PNGGCCRD and PNG_USE_PNGVCRD
1713 Fixed "LN_FS" typo in makefile.sco and makefile.solaris.
1714
1715Version 1.2.10rc2 [April 20, 2006]
1716 Added a backslash between -DPNG_CONFIGURE_LIBPNG and -DPNG_NO_ASSEMBLER_CODE
1717 in configure.ac and configure
1718 Made the configure warning about versioned symbols less arrogant.
1719
1720Version 1.2.10rc3 [April 21, 2006]
1721 Added a note in libpng.txt that png_set_sig_bytes(8) can be used when
1722 writing an embedded PNG without the 8-byte signature.
1723 Revised makefiles and configure to avoid making links to libpng.so.*
1724
1725Version 1.2.10 [April 23, 2006]
1726 Reverted configure to "rc2" state.
1727
1728Version 1.2.11beta1 [May 31, 2006]
1729 scripts/libpng.pc.in contained "configure" style version info and would
1730 not work with makefiles.
1731 The shared-library makefiles were linking to libpng.so.0 instead of
1732 libpng.so.3 compatibility as the library.
1733
1734Version 1.2.11beta2 [June 2, 2006]
1735 Increased sprintf buffer from 50 to 52 chars in pngrutil.c to avoid
1736 buffer overflow.
1737 Fixed bug in example.c (png_set_palette_rgb -> png_set_palette_to_rgb)
1738
1739Version 1.2.11beta3 [June 5, 2006]
1740 Prepended "#! /bin/sh" to ltmail.sh and contrib/pngminus/*.sh (Cosmin).
1741 Removed the accidental leftover Makefile.in~ (Cosmin).
1742 Avoided potential buffer overflow and optimized buffer in
1743 png_write_sCAL(), png_write_sCAL_s() (Cosmin).
1744 Removed the include directories and libraries from CFLAGS and LDFLAGS
1745 in scripts/makefile.gcc (Nelson A. de Oliveira, Cosmin).
1746
1747Version 1.2.11beta4 [June 6, 2006]
1748 Allow zero-length IDAT chunks after the entire zlib datastream, but not
1749 after another intervening chunk type.
1750
1751Version 1.0.19rc1, 1.2.11rc1 [June 13, 2006]
1752 Deleted extraneous square brackets from [config.h] in configure.ac
1753
1754Version 1.0.19rc2, 1.2.11rc2 [June 14, 2006]
1755 Added prototypes for PNG_INCH_CONVERSIONS functions to png.h
1756 Revised INSTALL and autogen.sh
1757 Fixed typo in several makefiles (-W1 should be -Wl)
1758 Added typedef for png_int_32 and png_uint_32 on 64-bit systems.
1759
1760Version 1.0.19rc3, 1.2.11rc3 [June 15, 2006]
1761 Removed the new typedefs for 64-bit systems (delay until version 1.4.0)
1762 Added one zero element to png_gamma_shift[] array in pngrtran.c to avoid
1763 reading out of bounds.
1764
1765Version 1.0.19rc4, 1.2.11rc4 [June 15, 2006]
1766 Really removed the new typedefs for 64-bit systems.
1767
1768Version 1.0.19rc5, 1.2.11rc5 [June 22, 2006]
1769 Removed png_sig_bytes entry from scripts/pngw32.def
1770
1771Version 1.0.19, 1.2.11 [June 26, 2006]
1772 None.
1773
1774Version 1.0.20, 1.2.12 [June 27, 2006]
1775 Really increased sprintf buffer from 50 to 52 chars in pngrutil.c to avoid
1776 buffer overflow.
1777
1778Version 1.2.13beta1 [October 2, 2006]
1779 Removed AC_FUNC_MALLOC from configure.ac
1780 Work around Intel-Mac compiler bug by setting PNG_NO_MMX_CODE in pngconf.h
1781 Change "logical" to "bitwise" throughout documentation.
1782 Detect and fix attempt to write wrong iCCP profile length (CVE-2006-7244)
1783
1784Version 1.0.21, 1.2.13 [November 14, 2006]
1785 Fix potential buffer overflow in sPLT chunk handler.
1786 Fix Makefile.am to not try to link to noexistent files.
1787 Check all exported functions for NULL png_ptr.
1788
1789Version 1.2.14beta1 [November 17, 2006]
1790 Relocated three misplaced tests for NULL png_ptr.
1791 Built Makefile.in with automake-1.9.6 instead of 1.9.2.
1792 Build configure with autoconf-2.60 instead of 2.59
1793
1794Version 1.2.14beta2 [November 17, 2006]
1795 Added some typecasts in png_zalloc().
1796
1797Version 1.2.14rc1 [November 20, 2006]
1798 Changed "strtod" to "png_strtod" in pngrutil.c
1799
1800Version 1.0.22, 1.2.14 [November 27, 2006]
1801 Added missing "$(srcdir)" in Makefile.am and Makefile.in
1802
1803Version 1.2.15beta1 [December 3, 2006]
1804 Generated configure with autoconf-2.61 instead of 2.60
1805 Revised configure.ac to update libpng.pc and libpng-config.
1806
1807Version 1.2.15beta2 [December 3, 2006]
1808 Always export MMX asm functions, just stubs if not building pnggccrd.c
1809
1810Version 1.2.15beta3 [December 4, 2006]
1811 Add "png_bytep" typecast to profile while calculating length in pngwutil.c
1812
1813Version 1.2.15beta4 [December 7, 2006]
1814 Added scripts/CMakeLists.txt
1815 Changed PNG_NO_ASSEMBLER_CODE to PNG_NO_MMX_CODE in scripts, like 1.4.0beta
1816
1817Version 1.2.15beta5 [December 7, 2006]
1818 Changed some instances of PNG_ASSEMBLER_* to PNG_MMX_* in pnggccrd.c
1819 Revised scripts/CMakeLists.txt
1820
1821Version 1.2.15beta6 [December 13, 2006]
1822 Revised scripts/CMakeLists.txt and configure.ac
1823
1824Version 1.2.15rc1 [December 18, 2006]
1825 Revised scripts/CMakeLists.txt
1826
1827Version 1.2.15rc2 [December 21, 2006]
1828 Added conditional #undef jmpbuf in pngtest.c to undo #define in AIX headers.
1829 Added scripts/makefile.nommx
1830
1831Version 1.2.15rc3 [December 25, 2006]
1832 Fixed shared library numbering error that was introduced in 1.2.15beta6.
1833
1834Version 1.2.15rc4 [December 27, 2006]
1835 Fixed handling of rgb_to_gray when png_ptr->color.gray isn't set.
1836
1837Version 1.2.15rc5 [December 31, 2006]
1838 Revised handling of rgb_to_gray.
1839
1840Version 1.2.15 [January 5, 2007]
1841 Added some (unsigned long) typecasts in pngtest.c to avoid printing errors.
1842
1843Version 1.2.16beta1 [January 6, 2007]
1844 Fix bugs in makefile.nommx
1845
1846Version 1.2.16beta2 [January 16, 2007]
1847 Revised scripts/CMakeLists.txt
1848
1849Version 1.2.16 [January 31, 2007]
1850 No changes.
1851
1852Version 1.2.17beta1 [March 6, 2007]
1853 Revised scripts/CMakeLists.txt to install both shared and static libraries.
1854 Deleted a redundant line from pngset.c.
1855
1856Version 1.2.17beta2 [April 26, 2007]
1857 Relocated misplaced test for png_ptr == NULL in pngpread.c
1858 Change "==" to "&" for testing PNG_RGB_TO_GRAY_ERR & PNG_RGB_TO_GRAY_WARN
1859 flags.
1860 Changed remaining instances of PNG_ASSEMBLER_* to PNG_MMX_*
1861 Added pngerror() when write_IHDR fails in deflateInit2().
1862 Added "const" to some array declarations.
1863 Mention examples of libpng usage in the libpng*.txt and libpng.3 documents.
1864
1865Version 1.2.17rc1 [May 4, 2007]
1866 No changes.
1867
1868Version 1.2.17rc2 [May 8, 2007]
1869 Moved several PNG_HAVE_* macros out of PNG_INTERNAL because applications
1870 calling set_unknown_chunk_location() need them.
1871 Changed transformation flag from PNG_EXPAND_tRNS to PNG_EXPAND in
1872 png_set_expand_gray_1_2_4_to_8().
1873 Added png_ptr->unknown_chunk to hold working unknown chunk data, so it
1874 can be free'ed in case of error. Revised unknown chunk handling in
1875 pngrutil.c and pngpread.c to use this structure.
1876
1877Version 1.2.17rc3 [May 8, 2007]
1878 Revised symbol-handling in configure script.
1879
1880Version 1.2.17rc4 [May 10, 2007]
1881 Revised unknown chunk handling to avoid storing unknown critical chunks.
1882
1883Version 1.0.25 [May 15, 2007]
1884Version 1.2.17 [May 15, 2007]
1885 Added "png_ptr->num_trans=0" before error return in png_handle_tRNS,
1886 to eliminate a vulnerability (CVE-2007-2445, CERT VU#684664)
1887
1888Version 1.0.26 [May 15, 2007]
1889Version 1.2.18 [May 15, 2007]
1890 Reverted the libpng-1.2.17rc3 change to symbol-handling in configure script
1891
1892Version 1.2.19beta1 [May 18, 2007]
1893 Changed "const static" to "static PNG_CONST" everywhere, mostly undoing
1894 change of libpng-1.2.17beta2. Changed other "const" to "PNG_CONST"
1895 Changed some handling of unused parameters, to avoid compiler warnings.
1896 "if (unused == NULL) return;" becomes "unused = unused".
1897
1898Version 1.2.19beta2 [May 18, 2007]
1899 Only use the valid bits of tRNS value in png_do_expand() (Brian Cartier)
1900
1901Version 1.2.19beta3 [May 19, 2007]
1902 Add some "png_byte" typecasts in png_check_keyword() and write new_key
1903 instead of key in zTXt chunk (Kevin Ryde).
1904
1905Version 1.2.19beta4 [May 21, 2007]
1906 Add png_snprintf() function and use it in place of sprint() for improved
1907 defense against buffer overflows.
1908
1909Version 1.2.19beta5 [May 21, 2007]
1910 Fixed png_handle_tRNS() to only use the valid bits of tRNS value.
1911 Changed handling of more unused parameters, to avoid compiler warnings.
1912 Removed some PNG_CONST in pngwutil.c to avoid compiler warnings.
1913
1914Version 1.2.19beta6 [May 22, 2007]
1915 Added some #ifdef PNG_MMX_CODE_SUPPORTED where needed in pngvcrd.c
1916 Added a special "_MSC_VER" case that defines png_snprintf to _snprintf
1917
1918Version 1.2.19beta7 [May 22, 2007]
1919 Squelched png_squelch_warnings() in pnggccrd.c and added
1920 an #ifdef PNG_MMX_CODE_SUPPORTED block around the declarations that caused
1921 the warnings that png_squelch_warnings was squelching.
1922
1923Version 1.2.19beta8 [May 22, 2007]
1924 Removed __MMX__ from test in pngconf.h.
1925
1926Version 1.2.19beta9 [May 23, 2007]
1927 Made png_squelch_warnings() available via PNG_SQUELCH_WARNINGS macro.
1928 Revised png_squelch_warnings() so it might work.
1929 Updated makefile.sgcc and makefile.solaris; added makefile.solaris-x86.
1930
1931Version 1.2.19beta10 [May 24, 2007]
1932 Resquelched png_squelch_warnings(), use "__attribute__((used))" instead.
1933
1934Version 1.4.0beta1 [April 20, 2006]
1935 Enabled iTXt support (changes png_struct, thus requires so-number change).
1936 Cleaned up PNG_ASSEMBLER_CODE_SUPPORTED vs PNG_MMX_CODE_SUPPORTED
1937 Eliminated PNG_1_0_X and PNG_1_2_X macros.
1938 Removed deprecated functions png_read_init, png_write_init, png_info_init,
1939 png_permit_empty_plte, png_set_gray_1_2_4_to_8, png_check_sig, and
1940 removed the deprecated macro PNG_MAX_UINT.
1941 Moved "PNG_INTERNAL" parts of png.h and pngconf.h into pngintrn.h
1942 Removed many WIN32_WCE #ifdefs (Cosmin).
1943 Reduced dependency on C-runtime library when on Windows (Simon-Pierre)
1944 Replaced sprintf() with png_sprintf() (Simon-Pierre)
1945
1946Version 1.4.0beta2 [April 20, 2006]
1947 Revised makefiles and configure to avoid making links to libpng.so.*
1948 Moved some leftover MMX-related defines from pngconf.h to pngintrn.h
1949 Updated scripts/pngos2.def, pngw32.def, and projects/wince/png32ce.def
1950
1951Version 1.4.0beta3 [May 10, 2006]
1952 Updated scripts/pngw32.def to comment out MMX functions.
1953 Added PNG_NO_GET_INT_32 and PNG_NO_SAVE_INT_32 macros.
1954 Scripts/libpng.pc.in contained "configure" style version info and would
1955 not work with makefiles.
1956 Revised pngconf.h and added pngconf.h.in, so makefiles and configure can
1957 pass defines to libpng and applications.
1958
1959Version 1.4.0beta4 [May 11, 2006]
1960 Revised configure.ac, Makefile.am, and many of the makefiles to write
1961 their defines in pngconf.h.
1962
1963Version 1.4.0beta5 [May 15, 2006]
1964 Added a missing semicolon in Makefile.am and Makefile.in
1965 Deleted extraneous square brackets from configure.ac
1966
1967Version 1.4.0beta6 [June 2, 2006]
1968 Increased sprintf buffer from 50 to 52 chars in pngrutil.c to avoid
1969 buffer overflow.
1970 Changed sonum from 0 to 1.
1971 Removed unused prototype for png_check_sig() from png.h
1972
1973Version 1.4.0beta7 [June 16, 2006]
1974 Exported png_write_sig (Cosmin).
1975 Optimized buffer in png_handle_cHRM() (Cosmin).
1976 Set pHYs = 2835 x 2835 pixels per meter, and added
1977 sCAL = 0.352778e-3 x 0.352778e-3 meters, in pngtest.png (Cosmin).
1978 Added png_set_benign_errors(), png_benign_error(), png_chunk_benign_error().
1979 Added typedef for png_int_32 and png_uint_32 on 64-bit systems.
1980 Added "(unsigned long)" typecast on png_uint_32 variables in printf lists.
1981
1982Version 1.4.0beta8 [June 22, 2006]
1983 Added demonstration of user chunk support in pngtest.c, to support the
1984 public sTER chunk and a private vpAg chunk.
1985
1986Version 1.4.0beta9 [July 3, 2006]
1987 Removed ordinals from scripts/pngw32.def and removed png_info_int and
1988 png_set_gray_1_2_4_to_8 entries.
1989 Inline call of png_get_uint_32() in png_get_uint_31().
1990 Use png_get_uint_31() to get vpAg width and height in pngtest.c
1991 Removed WINCE and Netware projects.
1992 Removed standalone Y2KINFO file.
1993
1994Version 1.4.0beta10 [July 12, 2006]
1995 Eliminated automatic copy of pngconf.h to pngconf.h.in from configure and
1996 some makefiles, because it was not working reliably. Instead, distribute
1997 pngconf.h.in along with pngconf.h and cause configure and some of the
1998 makefiles to update pngconf.h from pngconf.h.in.
1999 Added pngconf.h to DEPENDENCIES in Makefile.am
2000
2001Version 1.4.0beta11 [August 19, 2006]
2002 Removed AC_FUNC_MALLOC from configure.ac.
2003 Added a warning when writing iCCP profile with mismatched profile length.
2004 Patched pnggccrd.c to assemble on x86_64 platforms.
2005 Moved chunk header reading into a separate function png_read_chunk_header()
2006 in pngrutil.c. The chunk header (len+sig) is now serialized in a single
2007 operation (Cosmin).
2008 Implemented support for I/O states. Added png_ptr member io_state, and
2009 functions png_get_io_chunk_name() and png_get_io_state() in pngget.c
2010 (Cosmin).
2011 Added png_get_io_chunk_name and png_get_io_state to scripts/*.def (Cosmin).
2012 Renamed scripts/pngw32.* to scripts/pngwin.* (Cosmin).
2013 Removed the include directories and libraries from CFLAGS and LDFLAGS
2014 in scripts/makefile.gcc (Cosmin).
2015 Used png_save_uint_32() to set vpAg width and height in pngtest.c (Cosmin).
2016 Cast to proper type when getting/setting vpAg units in pngtest.c (Cosmin).
2017 Added pngintrn.h to the Visual C++ projects (Cosmin).
2018 Removed scripts/list (Cosmin).
2019 Updated copyright year in scripts/pngwin.def (Cosmin).
2020 Removed PNG_TYPECAST_NULL and used standard NULL consistently (Cosmin).
2021 Disallowed the user to redefine png_size_t, and enforced a consistent use
2022 of png_size_t across libpng (Cosmin).
2023 Changed the type of png_ptr->rowbytes, PNG_ROWBYTES() and friends
2024 to png_size_t (Cosmin).
2025 Removed png_convert_size() and replaced png_sizeof with sizeof (Cosmin).
2026 Removed some unnecessary type casts (Cosmin).
2027 Changed prototype of png_get_compression_buffer_size() and
2028 png_set_compression_buffer_size() to work with png_size_t instead of
2029 png_uint_32 (Cosmin).
2030 Removed png_memcpy_check() and png_memset_check() (Cosmin).
2031 Fixed a typo (png_byte --> png_bytep) in libpng.3 and libpng.txt (Cosmin).
2032 Clarified that png_zalloc() does not clear the allocated memory,
2033 and png_zalloc() and png_zfree() cannot be PNGAPI (Cosmin).
2034 Renamed png_mem_size_t to png_alloc_size_t, fixed its definition in
2035 pngconf.h, and used it in all memory allocation functions (Cosmin).
2036 Renamed pngintrn.h to pngpriv.h, added a comment at the top of the file
2037 mentioning that the symbols declared in that file are private, and
2038 updated the scripts and the Visual C++ projects accordingly (Cosmin).
2039 Removed circular references between pngconf.h and pngconf.h.in in
2040 scripts/makefile.vc*win32 (Cosmin).
2041 Removing trailing '.' from the warning and error messages (Cosmin).
2042 Added pngdefs.h that is built by makefile or configure, instead of
2043 pngconf.h.in (Glenn).
2044 Detect and fix attempt to write wrong iCCP profile length.
2045
2046Version 1.4.0beta12 [October 19, 2006]
2047 Changed "logical" to "bitwise" in the documentation.
2048 Work around Intel-Mac compiler bug by setting PNG_NO_MMX_CODE in pngconf.h
2049 Add a typecast to stifle compiler warning in pngrutil.c
2050
2051Version 1.4.0beta13 [November 10, 2006]
2052 Fix potential buffer overflow in sPLT chunk handler.
2053 Fix Makefile.am to not try to link to noexistent files.
2054
2055Version 1.4.0beta14 [November 15, 2006]
2056 Check all exported functions for NULL png_ptr.
2057
2058Version 1.4.0beta15 [November 17, 2006]
2059 Relocated two misplaced tests for NULL png_ptr.
2060 Built Makefile.in with automake-1.9.6 instead of 1.9.2.
2061 Build configure with autoconf-2.60 instead of 2.59
2062 Add "install: all" in Makefile.am so "configure; make install" will work.
2063
2064Version 1.4.0beta16 [November 17, 2006]
2065 Added a typecast in png_zalloc().
2066
2067Version 1.4.0beta17 [December 4, 2006]
2068 Changed "new_key[79] = '\0';" to "(*new_key)[79] = '\0';" in pngwutil.c
2069 Add "png_bytep" typecast to profile while calculating length in pngwutil.c
2070
2071Version 1.4.0beta18 [December 7, 2006]
2072 Added scripts/CMakeLists.txt
2073
2074Version 1.4.0beta19 [May 16, 2007]
2075 Revised scripts/CMakeLists.txt
2076 Rebuilt configure and Makefile.in with newer tools.
2077 Added conditional #undef jmpbuf in pngtest.c to undo #define in AIX headers.
2078 Added scripts/makefile.nommx
2079
2080Version 1.4.0beta20 [July 9, 2008]
2081 Moved several PNG_HAVE_* macros from pngpriv.h to png.h because applications
2082 calling set_unknown_chunk_location() need them.
2083 Moved several macro definitions from pngpriv.h to pngconf.h
2084 Merge with changes to the 1.2.X branch, as of 1.2.30beta04.
2085 Deleted all use of the MMX assembler code and Intel-licensed optimizations.
2086 Revised makefile.mingw
2087
2088Version 1.4.0beta21 [July 21, 2008]
2089 Moved local array "chunkdata" from pngrutil.c to the png_struct, so
2090 it will be freed by png_read_destroy() in case of a read error (Kurt
2091 Christensen).
2092
2093Version 1.4.0beta22 [July 21, 2008]
2094 Change "purpose" and "buffer" to png_ptr->chunkdata to avoid memory leaking.
2095
2096Version 1.4.0beta23 [July 22, 2008]
2097 Change "chunkdata = NULL" to "png_ptr->chunkdata = NULL" several places in
2098 png_decompress_chunk().
2099
2100Version 1.4.0beta24 [July 25, 2008]
2101 Change all remaining "chunkdata" to "png_ptr->chunkdata" in
2102 png_decompress_chunk(), and remove "chunkdata" from parameter list.
2103 Put a call to png_check_chunk_name() in png_read_chunk_header().
2104 Revised png_check_chunk_name() to reject a name with a lowercase 3rd byte.
2105 Removed two calls to png_check_chunk_name() occurring later in the process.
2106 Define PNG_NO_ERROR_NUMBERS by default in pngconf.h
2107
2108Version 1.4.0beta25 [July 30, 2008]
2109 Added a call to png_check_chunk_name() in pngpread.c
2110 Reverted png_check_chunk_name() to accept a name with a lowercase 3rd byte.
2111 Added png_push_have_buffer() function to pngpread.c
2112 Eliminated PNG_BIG_ENDIAN_SUPPORTED and associated png_get_* macros.
2113 Made inline expansion of png_get_*() optional with PNG_USE_READ_MACROS.
2114 Eliminated all PNG_USELESS_TESTS and PNG_CORRECT_PALETTE_SUPPORTED code.
2115 Synced contrib directory and configure files with libpng-1.2.30beta06.
2116 Eliminated no-longer-used pngdefs.h (but it's still built in the makefiles)
2117 Relocated a misplaced "#endif /* PNG_NO_WRITE_FILTER */" in pngwutil.c
2118
2119Version 1.4.0beta26 [August 4, 2008]
2120 Removed png_push_have_buffer() function in pngpread.c. It increased the
2121 compiled library size slightly.
2122 Changed "-Wall" to "-W -Wall" in the CFLAGS in all makefiles (Cosmin Truta)
2123 Declared png_ptr "volatile" in pngread.c and pngwrite.c to avoid warnings.
2124 Updated contrib/visupng/cexcept.h to version 2.0.1
2125 Added PNG_LITERAL_CHARACTER macros for #, [, and ].
2126
2127Version 1.4.0beta27 [August 5, 2008]
2128 Revised usage of PNG_LITERAL_SHARP in pngerror.c.
2129 Moved newline character from individual png_debug messages into the
2130 png_debug macros.
2131 Allow user to #define their own png_debug, png_debug1, and png_debug2.
2132
2133Version 1.4.0beta28 [August 5, 2008]
2134 Revised usage of PNG_LITERAL_SHARP in pngerror.c.
2135 Added PNG_STRING_NEWLINE macro
2136
2137Version 1.4.0beta29 [August 9, 2008]
2138 Revised usage of PNG_STRING_NEWLINE to work on non-ISO compilers.
2139 Added PNG_STRING_COPYRIGHT macro.
2140 Added non-ISO versions of png_debug macros.
2141
2142Version 1.4.0beta30 [August 14, 2008]
2143 Added premultiplied alpha feature (Volker Wiendl).
2144
2145Version 1.4.0beta31 [August 18, 2008]
2146 Moved png_set_premultiply_alpha from pngtrans.c to pngrtran.c
2147 Removed extra crc check at the end of png_handle_cHRM(). Bug introduced
2148 in libpng-1.4.0beta20.
2149
2150Version 1.4.0beta32 [August 19, 2008]
2151 Added PNG_WRITE_FLUSH_SUPPORTED block around new png_flush() call.
2152 Revised PNG_NO_STDIO version of png_write_flush()
2153
2154Version 1.4.0beta33 [August 20, 2008]
2155 Added png_get|set_chunk_cache_max() to limit the total number of sPLT,
2156 text, and unknown chunks that can be stored.
2157
2158Version 1.4.0beta34 [September 6, 2008]
2159 Shortened tIME_string to 29 bytes in pngtest.c
2160 Fixed off-by-one error introduced in png_push_read_zTXt() function in
2161 libpng-1.2.30beta04/pngpread.c (Harald van Dijk)
2162
2163Version 1.4.0beta35 [October 6, 2008]
2164 Changed "trans_values" to "trans_color".
2165 Changed so-number from 0 to 14. Some OS do not like 0.
2166 Revised makefile.darwin to fix shared library numbering.
2167 Change png_set_gray_1_2_4_to_8() to png_set_expand_gray_1_2_4_to_8()
2168 in example.c (debian bug report)
2169
2170Version 1.4.0beta36 [October 25, 2008]
2171 Sync with tEXt vulnerability fix in libpng-1.2.33rc02.
2172
2173Version 1.4.0beta37 [November 13, 2008]
2174 Added png_check_cHRM in png.c and moved checking from pngget.c, pngrutil.c,
2175 and pngwrite.c
2176
2177Version 1.4.0beta38 [November 22, 2008]
2178 Added check for zero-area RGB cHRM triangle in png_check_cHRM() and
2179 png_check_cHRM_fixed().
2180
2181Version 1.4.0beta39 [November 23, 2008]
2182 Revised png_warning() to write its message on standard output by default
2183 when warning_fn is NULL.
2184
2185Version 1.4.0beta40 [November 24, 2008]
2186 Eliminated png_check_cHRM(). Instead, always use png_check_cHRM_fixed().
2187 In png_check_cHRM_fixed(), ensure white_y is > 0, and removed redundant
2188 check for all-zero coordinates that is detected by the triangle check.
2189
2190Version 1.4.0beta41 [November 26, 2008]
2191 Fixed string vs pointer-to-string error in png_check_keyword().
2192 Rearranged test expressions in png_check_cHRM_fixed() to avoid internal
2193 overflows.
2194 Added PNG_NO_CHECK_cHRM conditional.
2195
2196Version 1.4.0beta42, 43 [December 1, 2008]
2197 Merge png_debug with version 1.2.34beta04.
2198
2199Version 1.4.0beta44 [December 6, 2008]
2200 Removed redundant check for key==NULL before calling png_check_keyword()
2201 to ensure that new_key gets initialized and removed extra warning
2202 (Merge with version 1.2.34beta05 -- Arvan Pritchard).
2203
2204Version 1.4.0beta45 [December 9, 2008]
2205 In png_write_png(), respect the placement of the filler bytes in an earlier
2206 call to png_set_filler() (Jim Barry).
2207
2208Version 1.4.0beta46 [December 10, 2008]
2209 Undid previous change and added PNG_TRANSFORM_STRIP_FILLER_BEFORE and
2210 PNG_TRANSFORM_STRIP_FILLER_AFTER conditionals and deprecated
2211 PNG_TRANSFORM_STRIP_FILLER (Jim Barry).
2212
2213Version 1.4.0beta47 [December 15, 2008]
2214 Support for dithering was disabled by default, because it has never
2215 been well tested and doesn't work very well. The code has not
2216 been removed, however, and can be enabled by building libpng with
2217 PNG_READ_DITHER_SUPPORTED defined.
2218
2219Version 1.4.0beta48 [February 14, 2009]
2220 Added new exported function png_calloc().
2221 Combined several instances of png_malloc(); png_memset() into png_calloc().
2222 Removed prototype for png_freeptr() that was added in libpng-1.4.0beta24
2223 but was never defined.
2224
2225Version 1.4.0beta49 [February 28, 2009]
2226 Added png_fileno() macro to pngconf.h, used in pngwio.c
2227 Corrected order of #ifdef's in png_debug definition in png.h
2228 Fixed bug introduced in libpng-1.4.0beta48 with the memset arguments
2229 for pcal_params.
2230 Fixed order of #ifdef directives in the png_debug defines in png.h
2231 (bug introduced in libpng-1.2.34/1.4.0beta29).
2232 Revised comments in png_set_read_fn() and png_set_write_fn().
2233
2234Version 1.4.0beta50 [March 18, 2009]
2235 Use png_calloc() instead of png_malloc() to allocate big_row_buf when
2236 reading an interlaced file, to avoid a possible UMR.
2237 Undid revision of PNG_NO_STDIO version of png_write_flush(). Users
2238 having trouble with fflush() can build with PNG_NO_WRITE_FLUSH defined
2239 or supply their own flush_fn() replacement.
2240 Revised libpng*.txt and png.h documentation about use of png_write_flush()
2241 and png_set_write_fn().
2242 Removed fflush() from pngtest.c.
2243 Added "#define PNG_NO_WRITE_FLUSH" to contrib/pngminim/encoder/pngusr.h
2244
2245Version 1.4.0beta51 [March 21, 2009]
2246 Removed new png_fileno() macro from pngconf.h .
2247
2248Version 1.4.0beta52 [March 27, 2009]
2249 Relocated png_do_chop() ahead of building gamma tables in pngrtran.c
2250 This avoids building 16-bit gamma tables unnecessarily.
2251 Removed fflush() from pngtest.c.
2252 Added "#define PNG_NO_WRITE_FLUSH" to contrib/pngminim/encoder/pngusr.h
2253 Added a section on differences between 1.0.x and 1.2.x to libpng.3/libpng.txt
2254
2255Version 1.4.0beta53 [April 1, 2009]
2256 Removed some remaining MMX macros from pngpriv.h
2257 Fixed potential memory leak of "new_name" in png_write_iCCP() (Ralph Giles)
2258
2259Version 1.4.0beta54 [April 13, 2009]
2260 Added "ifndef PNG_SKIP_SETJMP_CHECK" block in pngconf.h to allow
2261 application code writers to bypass the check for multiple inclusion
2262 of setjmp.h when they know that it is safe to ignore the situation.
2263 Eliminated internal use of setjmp() in pngread.c and pngwrite.c
2264 Reordered ancillary chunks in pngtest.png to be the same as what
2265 pngtest now produces, and made some cosmetic changes to pngtest output.
2266 Eliminated deprecated png_read_init_3() and png_write_init_3() functions.
2267
2268Version 1.4.0beta55 [April 15, 2009]
2269 Simplified error handling in pngread.c and pngwrite.c by putting
2270 the new png_read_cleanup() and png_write_cleanup() functions inline.
2271
2272Version 1.4.0beta56 [April 25, 2009]
2273 Renamed "user_chunk_data" to "my_user_chunk_data" in pngtest.c to suppress
2274 "shadowed declaration" warning from gcc-4.3.3.
2275 Renamed "gamma" to "png_gamma" in pngset.c to avoid "shadowed declaration"
2276 warning about a global "gamma" variable in math.h on some platforms.
2277
2278Version 1.4.0beta57 [May 2, 2009]
2279 Removed prototype for png_freeptr() that was added in libpng-1.4.0beta24
2280 but was never defined (again).
2281 Rebuilt configure scripts with autoconf-2.63 instead of 2.62
2282 Removed pngprefs.h and MMX from makefiles
2283
2284Version 1.4.0beta58 [May 14, 2009]
2285 Changed pngw32.def to pngwin.def in makefile.mingw (typo was introduced
2286 in beta57).
2287 Clarified usage of sig_bit versus sig_bit_p in example.c (Vincent Torri)
2288
2289Version 1.4.0beta59 [May 15, 2009]
2290 Reformated sources in libpng style (3-space intentation, comment format)
2291 Fixed typo in libpng docs (PNG_FILTER_AVE should be PNG_FILTER_AVG)
2292 Added sections about the git repository and our coding style to the
2293 documentation
2294 Relocated misplaced #endif in pngwrite.c, sCAL chunk handler.
2295
2296Version 1.4.0beta60 [May 19, 2009]
2297 Conditionally compile png_read_finish_row() which is not used by
2298 progressive readers.
2299 Added contrib/pngminim/preader to demonstrate building minimal progressive
2300 decoder, based on contrib/gregbook with embedded libpng and zlib.
2301
2302Version 1.4.0beta61 [May 20, 2009]
2303 In contrib/pngminim/*, renamed "makefile.std" to "makefile", since there
2304 is only one makefile in those directories, and revised the README files
2305 accordingly.
2306 More reformatting of comments, mostly to capitalize sentences.
2307
2308Version 1.4.0beta62 [June 2, 2009]
2309 Added "#define PNG_NO_WRITE_SWAP" to contrib/pngminim/encoder/pngusr.h
2310 and "define PNG_NO_READ_SWAP" to decoder/pngusr.h and preader/pngusr.h
2311 Reformatted several remaining "else statement" into two lines.
2312 Added a section to the libpng documentation about using png_get_io_ptr()
2313 in configure scripts to detect the presence of libpng.
2314
2315Version 1.4.0beta63 [June 15, 2009]
2316 Revised libpng*.txt and libpng.3 to mention calling png_set_IHDR()
2317 multiple times and to specify the sample order in the tRNS chunk,
2318 because the ISO PNG specification has a typo in the tRNS table.
2319 Changed several PNG_UNKNOWN_CHUNK_SUPPORTED to
2320 PNG_HANDLE_AS_UNKNOWN_SUPPORTED, to make the png_set_keep mechanism
2321 available for ignoring known chunks even when not saving unknown chunks.
2322 Adopted preference for consistent use of "#ifdef" and "#ifndef" versus
2323 "#if defined()" and "if !defined()" where possible.
2324
2325Version 1.4.0beta64 [June 24, 2009]
2326 Eliminated PNG_LEGACY_SUPPORTED code.
2327 Moved the various unknown chunk macro definitions outside of the
2328 PNG_READ|WRITE_ANCILLARY_CHUNK_SUPPORTED blocks.
2329
2330Version 1.4.0beta65 [June 26, 2009]
2331 Added a reference to the libpng license in each file.
2332
2333Version 1.4.0beta66 [June 27, 2009]
2334 Refer to the libpng license instead of the libpng license in each file.
2335
2336Version 1.4.0beta67 [July 6, 2009]
2337 Relocated INVERT_ALPHA within png_read_png() and png_write_png().
2338 Added high-level API transform PNG_TRANSFORM_GRAY_TO_RGB.
2339 Added an "xcode" project to the projects directory (Alam Arias).
2340
2341Version 1.4.0beta68 [July 19, 2009]
2342 Avoid some tests in filter selection in pngwutil.c
2343
2344Version 1.4.0beta69 [July 25, 2009]
2345 Simplified the new filter-selection test. This runs faster in the
2346 common "PNG_ALL_FILTERS" and PNG_FILTER_NONE cases.
2347 Removed extraneous declaration from the new call to png_read_gray_to_rgb()
2348 (bug introduced in libpng-1.4.0beta67).
2349 Fixed up xcode project (Alam Arias)
2350 Added a prototype for png_64bit_product() in png.c
2351
2352Version 1.4.0beta70 [July 27, 2009]
2353 Avoid a possible NULL dereference in debug build, in png_set_text_2().
2354 (bug introduced in libpng-0.95, discovered by Evan Rouault)
2355
2356Version 1.4.0beta71 [July 29, 2009]
2357 Rebuilt configure scripts with autoconf-2.64.
2358
2359Version 1.4.0beta72 [August 1, 2009]
2360 Replaced *.tar.lzma with *.tar.xz in distribution. Get the xz codec
2361 from <http://tukaani.org/xz>.
2362
2363Version 1.4.0beta73 [August 1, 2009]
2364 Reject attempt to write iCCP chunk with negative embedded profile length
2365 (JD Chen) (CVE-2009-5063).
2366
2367Version 1.4.0beta74 [August 8, 2009]
2368 Changed png_ptr and info_ptr member "trans" to "trans_alpha".
2369
2370Version 1.4.0beta75 [August 21, 2009]
2371 Removed an extra png_debug() recently added to png_write_find_filter().
2372 Fixed incorrect #ifdef in pngset.c regarding unknown chunk support.
2373
2374Version 1.4.0beta76 [August 22, 2009]
2375 Moved an incorrectly located test in png_read_row() in pngread.c
2376
2377Version 1.4.0beta77 [August 27, 2009]
2378 Removed lpXYZ.tar.bz2 (with CRLF), KNOWNBUG, libpng-x.y.z-KNOWNBUG.txt,
2379 and the "noconfig" files from the distribution.
2380 Moved CMakeLists.txt from scripts into the main libpng directory.
2381 Various bugfixes and improvements to CMakeLists.txt (Philip Lowman)
2382
2383Version 1.4.0beta78 [August 31, 2009]
2384 Converted all PNG_NO_* tests to PNG_*_SUPPORTED everywhere except pngconf.h
2385 Eliminated PNG_NO_FREE_ME and PNG_FREE_ME_SUPPORTED macros.
2386 Use png_malloc plus a loop instead of png_calloc() to initialize
2387 row_pointers in png_read_png().
2388
2389Version 1.4.0beta79 [September 1, 2009]
2390 Eliminated PNG_GLOBAL_ARRAYS and PNG_LOCAL_ARRAYS; always use local arrays.
2391 Eliminated PNG_CALLOC_SUPPORTED macro and always provide png_calloc().
2392
2393Version 1.4.0beta80 [September 17, 2009]
2394 Removed scripts/libpng.icc
2395 Changed typecast of filler from png_byte to png_uint_16 in png_set_filler().
2396 (Dennis Gustafsson)
2397 Fixed typo introduced in beta78 in pngtest.c ("#if def " should be "#ifdef ")
2398
2399Version 1.4.0beta81 [September 23, 2009]
2400 Eliminated unused PNG_FLAG_FREE_* defines from pngpriv.h
2401 Expanded TAB characters in pngrtran.c
2402 Removed PNG_CONST from all "PNG_CONST PNG_CHNK" declarations to avoid
2403 compiler complaints about doubly declaring things "const".
2404 Changed all "#if [!]defined(X)" to "if[n]def X" where possible.
2405 Eliminated unused png_ptr->row_buf_size
2406
2407Version 1.4.0beta82 [September 25, 2009]
2408 Moved redundant IHDR checking into new png_check_IHDR() in png.c
2409 and report all errors found in the IHDR data.
2410 Eliminated useless call to png_check_cHRM() from pngset.c
2411
2412Version 1.4.0beta83 [September 25, 2009]
2413 Revised png_check_IHDR() to eliminate bogus complaint about filter_type.
2414
2415Version 1.4.0beta84 [September 30, 2009]
2416 Fixed some inconsistent indentation in pngconf.h
2417 Revised png_check_IHDR() to add a test for width variable less than 32-bit.
2418
2419Version 1.4.0beta85 [October 1, 2009]
2420 Revised png_check_IHDR() again, to check info_ptr members instead of
2421 the contents of the returned parameters.
2422
2423Version 1.4.0beta86 [October 9, 2009]
2424 Updated the "xcode" project (Alam Arias).
2425 Eliminated a shadowed declaration of "pp" in png_handle_sPLT().
2426
2427Version 1.4.0rc01 [October 19, 2009]
2428 Trivial cosmetic changes.
2429
2430Version 1.4.0beta87 [October 30, 2009]
2431 Moved version 1.4.0 back into beta.
2432
2433Version 1.4.0beta88 [October 30, 2009]
2434 Revised libpng*.txt section about differences between 1.2.x and 1.4.0
2435 because most of the new features have now been ported back to 1.2.41
2436
2437Version 1.4.0beta89 [November 1, 2009]
2438 More bugfixes and improvements to CMakeLists.txt (Philip Lowman)
2439 Removed a harmless extra png_set_invert_alpha() from pngwrite.c
2440 Apply png_user_chunk_cache_max within png_decompress_chunk().
2441 Merged libpng-1.2.41.txt with libpng-1.4.0.txt where appropriate.
2442
2443Version 1.4.0beta90 [November 2, 2009]
2444 Removed all remaining WIN32_WCE #ifdefs except those involving the
2445 time.h "tm" structure
2446
2447Version 1.4.0beta91 [November 3, 2009]
2448 Updated scripts/pngw32.def and projects/wince/png32ce.def
2449 Copied projects/wince/png32ce.def to the scripts directory.
2450 Added scripts/makefile.wce
2451 Patched ltmain.sh for wince support.
2452 Added PNG_CONVERT_tIME_SUPPORTED macro.
2453
2454Version 1.4.0beta92 [November 4, 2009]
2455 Make inclusion of time.h in pngconf.h depend on PNG_CONVERT_tIME_SUPPORTED
2456 Make #define PNG_CONVERT_tIME_SUPPORTED depend on PNG_WRITE_tIME_SUPPORTED
2457 Revised libpng*.txt to describe differences from 1.2.40 to 1.4.0 (instead
2458 of differences from 1.2.41 to 1.4.0)
2459
2460Version 1.4.0beta93 [November 7, 2009]
2461 Added PNG_DEPSTRUCT, PNG_DEPRECATED, PNG_USE_RESULT, PNG_NORETURN, and
2462 PNG_ALLOCATED macros to detect deprecated direct access to the
2463 png_struct or info_struct members and other deprecated usage in
2464 applications (John Bowler).
2465 Updated scripts/makefile* to add "-DPNG_CONFIGURE_LIBPNG" to CFLAGS,
2466 to prevent warnings about direct access to png structs by libpng
2467 functions while building libpng. They need to be tested, especially
2468 those using compilers other than gcc.
2469 Updated projects/visualc6 and visualc71 with "/d PNG_CONFIGURE_LIBPNG".
2470 They should work but still need to be updated to remove
2471 references to pnggccrd.c or pngvcrd.c and ASM building.
2472 Added README.txt to the beos, cbuilder5, netware, and xcode projects warning
2473 that they need to be updated, to remove references to pnggccrd.c and
2474 pngvcrd.c and to depend on pngpriv.h
2475 Removed three direct references to read_info_ptr members in pngtest.c
2476 that were detected by the new PNG_DEPSTRUCT macro.
2477 Moved the png_debug macro definitions and the png_read_destroy(),
2478 png_write_destroy() and png_far_to_near() prototypes from png.h
2479 to pngpriv.h (John Bowler)
2480 Moved the synopsis lines for png_read_destroy(), png_write_destroy()
2481 png_debug(), png_debug1(), and png_debug2() from libpng.3 to libpngpf.3.
2482
2483Version 1.4.0beta94 [November 9, 2009]
2484 Removed the obsolete, unused pnggccrd.c and pngvcrd.c files.
2485 Updated CMakeLists.txt to add "-DPNG_CONFIGURE_LIBPNG" to the definitions.
2486 Removed dependency of pngtest.o on pngpriv.h in the makefiles.
2487 Only #define PNG_DEPSTRUCT, etc. in pngconf.h if not already defined.
2488
2489Version 1.4.0beta95 [November 10, 2009]
2490 Changed png_check_sig() to !png_sig_cmp() in contrib programs.
2491 Added -DPNG_CONFIGURE_LIBPNG to contrib/pngminm/*/makefile
2492 Changed png_check_sig() to !png_sig_cmp() in contrib programs.
2493 Corrected the png_get_IHDR() call in contrib/gregbook/readpng2.c
2494 Changed pngminim/*/gather.sh to stop trying to remove pnggccrd.c and pngvcrd.c
2495 Added dependency on pngpriv.h in contrib/pngminim/*/makefile
2496
2497Version 1.4.0beta96 [November 12, 2009]
2498 Renamed scripts/makefile.wce to scripts/makefile.cegcc
2499 Revised Makefile.am to use libpng.sys while building libpng.so
2500 so that only PNG_EXPORT functions are exported.
2501 Removed the deprecated png_check_sig() function/macro.
2502 Removed recently removed function names from scripts/*.def
2503 Revised pngtest.png to put chunks in the same order written by pngtest
2504 (evidently the same change made in libpng-1.0beta54 was lost).
2505 Added PNG_PRIVATE macro definition in pngconf.h for possible future use.
2506
2507Version 1.4.0beta97 [November 13, 2009]
2508 Restored pngtest.png to the libpng-1.4.0beta7 version.
2509 Removed projects/beos and netware.txt; no one seems to be supporting them.
2510 Revised Makefile.in
2511
2512Version 1.4.0beta98 [November 13, 2009]
2513 Added the "xcode" project to zip distributions,
2514 Fixed a typo in scripts/pngwin.def introduced in beta97.
2515
2516Version 1.4.0beta99 [November 14, 2009]
2517 Moved libpng-config.in and libpng.pc-configure.in out of the scripts
2518 directory, to libpng-config.in and libpng-pc.in, respectively, and
2519 modified Makefile.am and configure.ac accordingly. Now "configure"
2520 needs nothing from the "scripts" directory.
2521 Avoid redefining PNG_CONST in pngconf.h
2522
2523Version 1.4.0beta100 [November 14, 2009]
2524 Removed ASM builds from projects/visualc6 and projects/visualc71
2525 Removed scripts/makefile.nommx and makefile.vcawin32
2526 Revised CMakeLists.txt to account for new location of libpng-config.in
2527 and libpng-pc.in
2528 Updated INSTALL to reflect removal and relocation of files.
2529
2530Version 1.4.0beta101 [November 14, 2009]
2531 Restored the binary files (*.jpg, *.png, some project files) that were
2532 accidentally deleted from the zip and 7z distributions when the xcode
2533 project was added.
2534
2535Version 1.4.0beta102 [November 18, 2009]
2536 Added libpng-config.in and libpng-pc.in to the zip and 7z distributions.
2537 Fixed a typo in projects/visualc6/pngtest.dsp, introduced in beta100.
2538 Moved descriptions of makefiles and other scripts out of INSTALL into
2539 scripts/README.txt
2540 Updated the copyright year in scripts/pngwin.rc from 2006 to 2009.
2541
2542Version 1.4.0beta103 [November 21, 2009]
2543 Removed obsolete comments about ASM from projects/visualc71/README_zlib.txt
2544 Align row_buf on 16-byte boundary in memory.
2545 Restored the PNG_WRITE_FLUSH_AFTER_IEND_SUPPORTED guard around the call
2546 to png_flush() after png_write_IEND(). See 1.4.0beta32, 1.4.0beta50
2547 changes above and 1.2.30, 1.2.30rc01 and rc03 in 1.2.41 CHANGES. Someone
2548 needs this feature.
2549 Make the 'png_jmpbuf' macro expand to a call that records the correct
2550 longjmp function as well as returning a pointer to the setjmp
2551 jmp_buf buffer, and marked direct access to jmpbuf 'deprecated'.
2552 (John Bowler)
2553
2554Version 1.4.0beta104 [November 22, 2009]
2555 Removed png_longjmp_ptr from scripts/*.def and libpng.3
2556 Rebuilt configure scripts with autoconf-2.65
2557
2558Version 1.4.0beta105 [November 25, 2009]
2559 Use fast integer PNG_DIVIDE_BY_255() or PNG_DIVIDE_BY_65535()
2560 to accomplish alpha premultiplication when
2561 PNG_READ_COMPOSITE_NODIV_SUPPORTED is defined.
2562 Changed "/255" to "/255.0" in background calculations to make it clear
2563 that the 255 is used as a double.
2564
2565Version 1.4.0beta106 [November 27, 2009]
2566 Removed premultiplied alpha feature.
2567
2568Version 1.4.0beta107 [December 4, 2009]
2569 Updated README
2570 Added "#define PNG_NO_PEDANTIC_WARNINGS" in the libpng source files.
2571 Removed "-DPNG_CONFIGURE_LIBPNG" from the makefiles and projects.
2572 Revised scripts/makefile.netbsd, makefile.openbsd, and makefile.sco
2573 to put png.h and pngconf.h in $prefix/include, like the other scripts,
2574 instead of in $prefix/include/libpng. Also revised makefile.sco
2575 to put them in $prefix/include/libpng15 instead of in
2576 $prefix/include/libpng/libpng15.
2577
2578Version 1.4.0beta108 [December 11, 2009]
2579 Removed leftover "-DPNG_CONFIGURE_LIBPNG" from contrib/pngminim/*/makefile
2580 Relocated png_do_chop() to its original position in pngrtran.c; the
2581 change in version 1.2.41beta08 caused transparency to be handled wrong
2582 in some 16-bit datastreams (Yusaku Sugai).
2583
2584Version 1.4.0beta109 [December 13, 2009]
2585 Added "bit_depth" parameter to the private png_build_gamma_table() function.
2586 Pass bit_depth=8 to png_build_gamma_table() when bit_depth is 16 but the
2587 PNG_16_TO_8 transform has been set, to avoid unnecessary build of 16-bit
2588 tables.
2589
2590Version 1.4.0rc02 [December 20, 2009]
2591 Declared png_cleanup_needed "volatile" in pngread.c and pngwrite.c
2592
2593Version 1.4.0rc03 [December 22, 2009]
2594 Renamed libpng-pc.in back to libpng.pc.in and revised CMakeLists.txt
2595 (revising the change in 1.4.0beta99)
2596
2597Version 1.4.0rc04 [December 25, 2009]
2598 Swapped PNG_UNKNOWN_CHUNKS_SUPPORTED and PNG_HANDLE_AS_UNKNOWN_SUPPORTED
2599 in pngset.c to be consistent with other changes in version 1.2.38.
2600
2601Version 1.4.0rc05 [December 25, 2009]
2602 Changed "libpng-pc.in" to "libpng.pc.in" in configure.ac, configure, and
2603 Makefile.in to be consistent with changes in libpng-1.4.0rc03
2604
2605Version 1.4.0rc06 [December 29, 2009]
2606 Reverted the gamma_table changes from libpng-1.4.0beta109.
2607 Fixed some indentation errors.
2608
2609Version 1.4.0rc07 [January 1, 2010]
2610 Revised libpng*.txt and libpng.3 about 1.2.x->1.4.x differences.
2611 Use png_calloc() instead of png_malloc(); png_memset() in pngrutil.c
2612 Update copyright year to 2010.
2613
2614Version 1.4.0rc08 [January 2, 2010]
2615 Avoid deprecated references to png_ptr-io_ptr and png_ptr->error_ptr
2616 in pngtest.c
2617
2618Version 1.4.0 [January 3, 2010]
2619 No changes.
2620
2621Version 1.4.1beta01 [January 8, 2010]
2622 Updated CMakeLists.txt for consistent indentation and to avoid an
2623 unclosed if-statement warning (Philip Lowman).
2624 Revised Makefile.am and Makefile.in to remove references to Y2KINFO,
2625 KNOWNBUG, and libpng.la (Robert Schwebel).
2626 Revised the makefiles to install the same files and symbolic
2627 links as configure, except for libpng.la and libpng14.la.
2628 Make png_set|get_compression_buffer_size() available even when
2629 PNG_WRITE_SUPPORTED is not enabled.
2630 Revised Makefile.am and Makefile.in to simplify their maintenance.
2631 Revised scripts/makefile.linux to install a link to libpng14.so.14.1
2632
2633Version 1.4.1beta02 [January 9, 2010]
2634 Revised the rest of the makefiles to install a link to libpng14.so.14.1
2635
2636Version 1.4.1beta03 [January 10, 2010]
2637 Removed png_set_premultiply_alpha() from scripts/*.def
2638
2639Version 1.4.1rc01 [January 16, 2010]
2640 No changes.
2641
2642Version 1.4.1beta04 [January 23, 2010]
2643 Revised png_decompress_chunk() to improve speed and memory usage when
2644 decoding large chunks.
2645 Added png_set|get_chunk_malloc_max() functions.
2646
2647Version 1.4.1beta05 [January 26, 2010]
2648 Relocated "int k" declaration in pngtest.c to minimize its scope.
2649
2650Version 1.4.1beta06 [January 28, 2010]
2651 Revised png_decompress_chunk() to use a two-pass method suggested by
2652 John Bowler.
2653
2654Version 1.4.1beta07 [February 6, 2010]
2655 Folded some long lines in the source files.
2656 Added defineable PNG_USER_CHUNK_CACHE_MAX, PNG_USER_CHUNK_MALLOC_MAX,
2657 and a PNG_USER_LIMITS_SUPPORTED flag.
2658 Eliminated use of png_ptr->irowbytes and reused the slot in png_ptr as
2659 png_ptr->png_user_chunk_malloc_max.
2660 Revised png_push_save_buffer() to do fewer but larger png_malloc() calls.
2661
2662Version 1.4.1beta08 [February 6, 2010]
2663 Minor cleanup and updating of dates and copyright year.
2664
2665Version 1.5.0beta01 [February 7, 2010]
2666 Moved declaration of png_struct into private pngstruct.h and png_info
2667 into pnginfo.h
2668
2669Version 1.4.1beta09 and 1.5.0beta02 [February 7, 2010]
2670 Reverted to original png_push_save_buffer() code.
2671
2672Version 1.4.1beta10 and 1.5.0beta03 [February 8, 2010]
2673 Return allocated "old_buffer" in png_push_save_buffer() before
2674 calling png_error(), to avoid a potential memory leak.
2675 Updated configure script to use SO number 15.
2676
2677Version 1.5.0beta04 [February 9, 2010]
2678 Removed malformed "incomplete struct declaration" of png_info from png.h
2679
2680Version 1.5.0beta05 [February 12, 2010]
2681 Removed PNG_DEPSTRUCT markup in pngstruct.h and pnginfo.h, and undid the
2682 linewrapping that it entailed.
2683 Revised comments in pngstruct.h and pnginfo.h and added pointers to
2684 the libpng license.
2685 Changed PNG_INTERNAL to PNG_EXPOSE_INTERNAL_STRUCTURES
2686 Removed the cbuilder5 project, which has not been updated to 1.4.0.
2687
2688Version 1.4.1beta12 and 1.5.0beta06 [February 14, 2010]
2689 Fixed type declaration of png_get_chunk_malloc_max() in pngget.c (Daisuke
2690 Nishikawa)
2691
2692Version 1.5.0beta07 [omitted]
2693
2694Version 1.5.0beta08 [February 19, 2010]
2695 Changed #ifdef PNG_NO_STDIO_SUPPORTED to #ifdef PNG_NO_CONSOLE_IO_SUPPORTED
2696 wherever png_snprintf() is used to construct error and warning messages.
2697 Noted in scripts/makefile.mingw that it expects to be run under MSYS.
2698 Removed obsolete unused MMX-querying support from contrib/gregbook
2699 Added exported png_longjmp() function.
2700 Removed the AIX redefinition of jmpbuf in png.h
2701 Added -D_ALLSOURCE in configure.ac, makefile.aix, and CMakeLists.txt
2702 when building on AIX.
2703
2704Version 1.5.0beta09 [February 19, 2010]
2705 Removed -D_ALLSOURCE from configure.ac, makefile.aix, and CMakeLists.txt.
2706 Changed the name of png_ptr->jmpbuf to png_ptr->png_jmpbuf in pngstruct.h
2707
2708Version 1.5.0beta10 [February 25, 2010]
2709 Removed unused gzio.c from contrib/pngminim gather and makefile scripts
2710 Removed replacement error handlers from contrib/gregbook. Because of
2711 the new png_longjmp() function they are no longer needed.
2712
2713Version 1.5.0beta11 [March 6, 2010]
2714 Removed checking for already-included setjmp.h from pngconf.h
2715 Fixed inconsistent indentations and made numerous cosmetic changes.
2716 Revised the "SEE ALSO" style of libpng.3, libpngpf.3, and png.5
2717
2718Version 1.5.0beta12 [March 9, 2010]
2719 Moved "#include png.h" inside pngpriv.h and removed "#include png.h" from
2720 the source files, along with "#define PNG_EXPOSE_INTERNAL_STRUCTURES"
2721 and "#define PNG_NO_PEDANTIC_WARNINGS" (John Bowler).
2722 Created new pngdebug.h and moved debug definitions there.
2723
2724Version 1.5.0beta13 [March 10, 2010]
2725 Protect pngstruct.h, pnginfo.h, and pngdebug.h from being included twice.
2726 Revise the "#ifdef" blocks in png_inflate() so it will compile when neither
2727 PNG_USER_CHUNK_MALLOC_MAX nor PNG_SET_CHUNK_MALLOC_LIMIT_SUPPORTED
2728 is defined.
2729 Removed unused png_measure_compressed_chunk() from pngpriv.h and libpngpf.3
2730 Moved the 'config.h' support from pngconf.h to pngpriv.h
2731 Removed PNGAPI from the png_longjmp_ptr typedef.
2732 Eliminated dependence of pngtest.c on the private pngdebug.h file.
2733 Make all png_debug macros into *unterminated* statements or
2734 expressions (i.e. a trailing ';' must always be added) and correct
2735 the format statements in various png_debug messages.
2736
2737Version 1.5.0beta14 [March 14, 2010]
2738 Removed direct access to png_ptr->io_ptr from the Windows code in pngtest.c
2739 Revised Makefile.am to account for recent additions and replacements.
2740 Corrected CE and OS/2 DEF files (scripts/png*def) for symbols removed and
2741 added ordinal numbers to the Windows DEF file and corrected the duplicated
2742 ordinal numbers on CE symbols that are commented out.
2743 Added back in export symbols that can be present in the Windows build but
2744 are disabled by default.
2745 PNG_EXPORT changed to include an 'ordinal' field for DEF file generation.
2746 PNG_CALLBACK added to make callback definitions uniform. PNGAPI split
2747 into PNGCAPI (base C form), PNGAPI (exports) and PNGCBAPI (callbacks),
2748 and appropriate changes made to all files. Cygwin builds re-hinged to
2749 allow procedure call standard changes and to remove the need for the DEF
2750 file (fixes build on Cygwin).
2751 Enabled 'attribute' warnings that are relevant to library APIs and callbacks.
2752 Changed rules for generation of the various symbol files and added a new
2753 rule for a DEF file (which is also added to the distribution).
2754 Updated the symbol file generation to stop it adding spurious spaces
2755 to EOL (coming from preprocessor macro expansion). Added a facility
2756 to join tokens in the output and rewrite *.dfn to use this.
2757 Eliminated scripts/*.def in favor of libpng.def; updated projects/visualc71
2758 and removed scripts/makefile.cygwin.
2759 Made PNG_BUILD_DLL safe: it can be set whenever a DLL is being built.
2760 Removed the include of sys/types.h - apparently unnecessary now on the
2761 platforms on which it happened (all but Mac OS and RISC OS).
2762 Moved the Mac OS test into pngpriv.h (the only place it is used.)
2763
2764Version 1.5.0beta15 [March 17, 2010]
2765 Added symbols.chk target to Makefile.am to validate the symbols in png.h
2766 against the new DEF file scripts/symbols.def.
2767 Changed the default DEF file back to pngwin.def.
2768 Removed makefile.mingw.
2769 Eliminated PNG_NO_EXTERN and PNG_ALL_EXTERN
2770
2771Version 1.5.0beta16 [April 1, 2010]
2772 Make png_text_struct independent of PNG_iTXt_SUPPORTED, so that
2773 fields are initialized in all configurations. The READ/WRITE
2774 macros (PNG_(READ|WRITE)_iTXt_SUPPORTED) still function as
2775 before to disable code to actually read or write iTXt chunks
2776 and iTXt_SUPPORTED can be used to detect presence of either
2777 read or write support (but it is probably better to check for
2778 the one actually required - read or write.)
2779 Combined multiple png_warning() calls for a single error.
2780 Restored the macro definition of png_check_sig().
2781
2782Version 1.5.0beta17 [April 17, 2010]
2783 Added some "(long)" typecasts to printf calls in png_handle_cHRM().
2784 Documented the fact that png_set_dither() was disabled since libpng-1.4.0.
2785 Reenabled png_set_dither() but renamed it to png_set_quantize() to reflect
2786 more accurately what it actually does. At the same time, renamed
2787 the PNG_DITHER_[RED,GREEN_BLUE]_BITS macros to
2788 PNG_QUANTIZE_[RED,GREEN,BLUE]_BITS.
2789 Added some "(long)" typecasts to printf calls in png_handle_cHRM().
2790 Freeze build-time only configuration in the build.
2791 In all prior versions of libpng most configuration options
2792 controlled by compiler #defines had to be repeated by the
2793 application code that used libpng. This patch changes this
2794 so that compilation options that can only be changed at build
2795 time are frozen in the build. Options that are compiler
2796 dependent (and those that are system dependent) are evaluated
2797 each time - pngconf.h holds these. Options that can be changed
2798 per-file in the application are in png.h. Frozen options are
2799 in the new installed header file pnglibconf.h (John Bowler)
2800 Removed the xcode project because it has not been updated to work
2801 with libpng-1.5.0.
2802 Removed the ability to include optional pngusr.h
2803
2804Version 1.5.0beta18 [April 17, 2010]
2805 Restored the ability to include optional pngusr.h
2806 Moved replacements for png_error() and png_warning() from the
2807 contrib/pngminim project to pngerror.c, for use when warnings or
2808 errors are disabled via PNG_NO_WARN or PNG_NO_ERROR_TEXT, to avoid
2809 storing unneeded error/warning text.
2810 Updated contrib/pngminim project to work with the new pnglibconf.h
2811 Added some PNG_NO_* defines to contrib/pngminim/*/pngusr.h to save space.
2812
2813Version 1.5.0beta19 [April 24, 2010]
2814 Added PNG_{READ,WRITE}_INT_FUNCTIONS_SUPPORTED. This allows the functions
2815 to read and write ints to be disabled independently of PNG_USE_READ_MACROS,
2816 which allows libpng to be built with the functions even though the default
2817 is to use the macros - this allows applications to choose at app build
2818 time whether or not to use macros (previously impossible because the
2819 functions weren't in the default build.)
2820 Changed Windows calling convention back to __cdecl for API functions.
2821 For Windows/x86 platforms only:
2822 __stdcall is no longer needed for Visual Basic, so libpng-1.5.0 uses
2823 __cdecl throughout (both API functions and callbacks) on Windows/x86
2824 platforms.
2825 Replaced visualc6 and visualc71 projects with new vstudio project
2826 Relaxed the overly-restrictive permissions of some files.
2827
2828Version 1.5.0beta20 [April 24, 2010]
2829 Relaxed more overly-restrictive permissions of some files.
2830
2831Version 1.5.0beta21 [April 27, 2010]
2832 Removed some unwanted binary bytes and changed CRLF to NEWLINE in the new
2833 vstudio project files, and some trivial editing of some files in the
2834 scripts directory.
2835 Set PNG_NO_READ_BGR, PNG_NO_IO_STATE, and PNG_NO_TIME_RFC1123 in
2836 contrib/pngminim/decoder/pngusr.h to make a smaller decoder application.
2837
2838Version 1.5.0beta22 [April 28, 2010]
2839 Fixed dependencies of GET_INT_32 - it does not require READ_INT_FUNCTIONS
2840 because it has a macro equivalent.
2841 Improved the options.awk script; added an "everything off" option.
2842 Revised contrib/pngminim to use the "everything off" option in pngusr.dfa.
2843
2844Version 1.5.0beta23 [April 29, 2010]
2845 Corrected PNG_REMOVED macro to take five arguments.
2846 The macro was documented with two arguments (name,ordinal), however
2847 the symbol checking .dfn files assumed five arguments. The five
2848 argument form seems more useful so it is changed to that.
2849 Corrected PNG_UNKNOWN_CHUNKS_SUPPORTED to PNG_HANDLE_AS_UNKNOWN_SUPPORTED
2850 in gregbook/readpng2.c
2851 Corrected protection of png_get_user_transform_ptr. The API declaration in
2852 png.h is removed if both READ and WRITE USER_TRANSFORM are turned off
2853 but was left defined in pngtrans.c
2854 Added logunsupported=1 to cause pnglibconf.h to document disabled options.
2855 This makes the installed pnglibconf.h more readable but causes no
2856 other change. The intention is that users of libpng will find it
2857 easier to understand if an API they need is missing.
2858 Include png_reset_zstream() in png.c only when PNG_READ_SUPPORTED is defined.
2859 Removed dummy_inflate.c from contrib/pngminim/encoder
2860 Removed contrib/pngminim/*/gather.sh; gathering is now done in the makefile.
2861
2862Version 1.5.0beta24 [May 7, 2010]
2863 Use bitwise "&" instead of arithmetic mod in pngrutil.c calculation of the
2864 offset of the png_ptr->rowbuf pointer into png_ptr->big_row_buf.
2865 Added more blank lines for readability.
2866
2867Version 1.5.0beta25 [June 18, 2010]
2868 In pngpread.c: png_push_have_row() add check for new_row > height
2869 Removed the now-redundant check for out-of-bounds new_row from example.c
2870
2871Version 1.5.0beta26 [June 18, 2010]
2872 In pngpread.c: png_push_process_row() add check for too many rows.
2873
2874Version 1.5.0beta27 [June 18, 2010]
2875 Removed the check added in beta25 as it is now redundant.
2876
2877Version 1.5.0beta28 [June 20, 2010]
2878 Rewrote png_process_IDAT_data to consistently treat extra data as warnings
2879 and handle end conditions more cleanly.
2880 Removed the new (beta26) check in png_push_process_row().
2881
2882Version 1.5.0beta29 [June 21, 2010]
2883 Revised scripts/options.awk to work on Sunos (but still doesn't work)
2884 Added comment to options.awk and contrib/pngminim/*/makefile to try nawk.
2885
2886Version 1.5.0beta30 [June 22, 2010]
2887 Stop memory leak when reading a malformed sCAL chunk.
2888
2889Version 1.5.0beta31 [June 26, 2010]
2890 Revised pngpread.c patch of beta28 to avoid an endless loop.
2891 Removed some trailing blanks.
2892
2893Version 1.5.0beta32 [June 26, 2010]
2894 Removed leftover scripts/options.patch and scripts/options.rej
2895
2896Version 1.5.0beta33 [July 6, 3010]
2897 Made FIXED and FLOATING options consistent in the APIs they enable and
2898 disable. Corrected scripts/options.awk to handle both command line
2899 options and options specified in the .dfa files.
2900 Changed char *msg to PNG_CONST char *msg in pngrutil.c
2901 Make png_set_sRGB_gAMA_and_cHRM set values using either the fixed or
2902 floating point APIs, but not both.
2903 Reversed patch to remove error handler when the jmp_buf is stored in the
2904 main program structure, not the png_struct.
2905 The error handler is needed because the default handler in libpng will
2906 always use the jmp_buf in the library control structure; this is never
2907 set. The gregbook code is a useful example because, even though it
2908 uses setjmp/longjmp, it shows how error handling can be implemented
2909 using control mechanisms not directly supported by libpng. The
2910 technique will work correctly with mechanisms such as Microsoft
2911 Structure Exceptions or C++ exceptions (compiler willing - note that gcc
2912 does not by default support interworking of C and C++ error handling.)
2913 Reverted changes to call png_longjmp in contrib/gregbook where it is not
2914 appropriate. If mainprog->jmpbuf is used by setjmp, then png_longjmp
2915 cannot be used.
2916 Changed "extern PNG_EXPORT" to "PNG_EXPORT" in png.h (Jan Nijtmans)
2917 Changed "extern" to "PNG_EXTERN" in pngpriv.h (except for the 'extern "C" {')
2918
2919Version 1.5.0beta34 [July 12, 2010]
2920 Put #ifndef PNG_EXTERN, #endif around the define PNG_EXTERN in pngpriv.h
2921
2922Version 1.5.0beta35 [July 24, 2010]
2923 Removed some newly-added TAB characters.
2924 Added -DNO_PNG_SNPRINTF to CFLAGS in scripts/makefile.dj2
2925 Moved the definition of png_snprintf() outside of the enclosing
2926 #ifdef blocks in pngconf.h
2927
2928Version 1.5.0beta36 [July 29, 2010]
2929 Patches by John Bowler:
2930 Fixed point APIs are now supported throughout (no missing APIs).
2931 Internal fixed point arithmetic support exists for all internal floating
2932 point operations.
2933 sCAL validates the floating point strings it is passed.
2934 Safe, albeit rudimentary, Watcom support is provided by PNG_API_RULE==2
2935 Two new APIs exist to get the number of passes without turning on the
2936 PNG_INTERLACE transform and to get the number of rows in the current
2937 pass.
2938 A new test program, pngvalid.c, validates the gamma code.
2939 Errors in the 16-bit gamma correction (overflows) have been corrected.
2940 cHRM chunk testing is done consistently (previously the floating point
2941 API bypassed it, because the test really didn't work on FP, now the test
2942 is performed on the actual values to be stored in the PNG file so it
2943 works in the FP case too.)
2944 Most floating point APIs now simply call the fixed point APIs after
2945 converting the values to the fixed point form used in the PNG file.
2946 The standard headers no longer include zlib.h, which is currently only
2947 required for pngstruct.h and can therefore be internal.
2948 Revised png_get_int_32 to undo the PNG two's complement representation of
2949 negative numbers.
2950
2951Version 1.5.0beta37 [July 30, 2010]
2952 Added a typecast in png_get_int_32() in png.h and pngrutil.h to avoid
2953 a compiler warning.
2954 Replaced oFFs 0,0 with oFFs -10,20 in pngtest.png
2955
2956Version 1.5.0beta38 [July 31, 2010]
2957 Implemented remaining "_fixed" functions.
2958 Corrected a number of recently introduced warnings mostly resulting from
2959 safe but uncast assignments to shorter integers. Also added a zlib
2960 VStudio release library project because the latest zlib Official Windows
2961 build does not include such a thing.
2962 Revised png_get_int_16() to be similar to png_get_int_32().
2963 Restored projects/visualc71.
2964
2965Version 1.5.0beta39 [August 2, 2010]
2966 VisualC/GCC warning fixes, VisualC build fixes
2967 The changes include support for function attributes in VC in addition to
2968 those already present in GCC - necessary because without these some
2969 warnings are unavoidable. Fixes include signed/unsigned fixes in
2970 pngvalid and checks with gcc -Wall -Wextra -Wunused.
2971 VC requires function attributes on function definitions as well as
2972 declarations, PNG_FUNCTION has been added to enable this and the
2973 relevant function definitions changed.
2974
2975Version 1.5.0beta40 [August 6, 2010]
2976 Correct use of _WINDOWS_ in pngconf.h
2977 Removed png_mem_ #defines; they are no longer used.
2978 Added the sRGB chunk to pngtest.png
2979
2980Version 1.5.0beta41 [August 11, 2010]
2981 Added the cHRM chunk to pngtest.png
2982 Don't try to use version-script with cygwin/mingw.
2983 Revised contrib/gregbook to work under cygwin/mingw.
2984
2985Version 1.5.0beta42 [August 18, 2010]
2986 Add .dll.a to the list of extensions to be symlinked by Makefile.am (Yaakov)
2987 Made all API functions that have const arguments and constant string
2988 literal pointers declare them (John Bowler).
2989
2990Version 1.5.0beta43 [August 20, 2010]
2991 Removed spurious tabs, shorten long lines (no source change)
2992 Also added scripts/chkfmt to validate the format of all the files that can
2993 reasonably be validated (it is suggested to run "make distclean" before
2994 checking, because some machine generated files have long lines.)
2995 Reformatted the CHANGES file to be more consistent throughout.
2996 Made changes to address various issues identified by GCC, mostly
2997 signed/unsigned and shortening problems on assignment but also a few
2998 difficult to optimize (for GCC) loops.
2999 Fixed non-GCC fixed point builds. In png.c a declaration was misplaced
3000 in an earlier update. Fixed to declare the auto variables at the head.
3001 Use cexcept.h in pngvalid.c.
3002
3003Version 1.5.0beta44 [August 24, 2010]
3004 Updated CMakeLists.txt to use CMAKE_INSTALL_LIBDIR variable; useful for
3005 installing libpng in /usr/lib64 (Funda Wang).
3006 Revised CMakeLists.txt to put the man pages in share/man/man* not man/man*
3007 Revised CMakeLists.txt to make symlinks instead of copies when installing.
3008 Changed PNG_LIB_NAME from pngNN to libpngNN in CMakeLists.txt (Philip Lowman)
3009 Implemented memory checks within pngvalid
3010 Reformatted/rearranged pngvalid.c to assist use of progressive reader.
3011 Check interlaced images in pngvalid
3012 Clarified pngusr.h comments in pnglibconf.dfa
3013 Simplified the pngvalid error-handling code now that cexcept.h is in place.
3014 Implemented progressive reader in pngvalid.c for standard tests
3015 Implemented progressive read in pngvalid.c gamma tests
3016 Turn on progressive reader in pngvalid.c by default and tidy code.
3017
3018Version 1.5.0beta45 [August 26, 2010]
3019 Added an explicit make step to projects/vstudio for pnglibconf.h
3020 Also corrected zlib.vcxproj into which Visual Studio had introduced
3021 what it calls an "authoring error". The change to make pnglibconf.h
3022 simply copies the file; in the future it may actually generate the
3023 file from scripts/pnglibconf.dfa as the other build systems do.
3024 Changed pngvalid to work when floating point APIs are disabled
3025 Renamed the prebuilt scripts/pnglibconf.h to scripts/pnglibconf.h.prebuilt
3026 Supply default values for PNG_USER_PRIVATEBUILD and PNG_USER_DLLFNAME_POSTFIX
3027 in pngpriv.h in case the user neglected to define them in their pngusr.h
3028
3029Version 1.5.0beta46 [August 28, 2010]
3030 Added new private header files to libpng_sources in CMakeLists.txt
3031 Added PNG_READ_16BIT, PNG_WRITE_16BIT, and PNG_16BIT options.
3032 Added reference to scripts/pnglibconf.h.prebuilt in the visualc71 project.
3033
3034Version 1.5.0beta47 [September 11, 2010]
3035 Fixed a number of problems with 64-bit compilation reported by Visual
3036 Studio 2010 (John Bowler).
3037
3038Version 1.5.0beta48 [October 4, 2010]
3039 Updated CMakeLists.txt (Philip Lowman).
3040 Revised autogen.sh to recognize and use $AUTOCONF, $AUTOMAKE, $AUTOHEADER,
3041 $AUTOPOINT, $ACLOCAL and $LIBTOOLIZE
3042 Fixed problem with symbols creation in Makefile.am which was assuming that
3043 all versions of ccp write to standard output by default (Martin Banky). The
3044 bug was introduced in libpng-1.2.9beta5.
3045 Removed unused mkinstalldirs.
3046
3047Version 1.5.0beta49 [October 8, 2010]
3048 Undid Makefile.am revision of 1.5.0beta48.
3049
3050Version 1.5.0beta50 [October 14, 2010]
3051 Revised Makefile.in to account for mkinstalldirs being removed.
3052 Added some "(unsigned long)" typecasts in printf statements in pngvalid.c.
3053 Suppressed a compiler warning in png_handle_sPLT().
3054 Check for out-of-range text compression mode in png_set_text().
3055
3056Version 1.5.0beta51 [October 15, 2010]
3057 Changed embedded dates to "(PENDING RELEASE) in beta releases (and future
3058 rc releases) to minimize the difference between releases.
3059
3060Version 1.5.0beta52 [October 16, 2010]
3061 Restored some of the embedded dates (in png.h, png.c, documentation, etc.)
3062
3063Version 1.5.0beta53 [October 18, 2010]
3064 Updated INSTALL to mention using "make maintainer-clean" and to remove
3065 obsolete statement about a custom ltmain.sh
3066 Disabled "color-tests" by default in Makefile.am so it will work with
3067 automake versions earlier than 1.11.1
3068 Use document name "libpng-manual.txt" instead of "libpng-<version>.txt"
3069 to simplify version differences.
3070 Removed obsolete remarks about setjmp handling from INSTALL.
3071 Revised and renamed the typedef in png.h and png.c that was designed
3072 to catch library and header mismatch.
3073
3074Version 1.5.0beta54 [November 10, 2010]
3075 Require 48 bytes, not 64 bytes, for big_row_buf in overflow checks.
3076 Used a consistent structure for the pngget.c functions.
3077
3078Version 1.5.0beta55 [November 21, 2010]
3079 Revised png_get_uint_32, png_get_int_32, png_get_uint_16 (Cosmin)
3080 Moved reading of file signature into png_read_sig (Cosmin)
3081 Fixed atomicity of chunk header serialization (Cosmin)
3082 Added test for io_state in pngtest.c (Cosmin)
3083 Added "#!/bin/sh" at the top of contrib/pngminim/*/gather.sh scripts.
3084 Changes to remove gcc warnings (John Bowler)
3085 Certain optional gcc warning flags resulted in warnings in libpng code.
3086 With these changes only -Wconversion and -Wcast-qual cannot be turned on.
3087 Changes are trivial rearrangements of code. -Wconversion is not possible
3088 for pngrutil.c (because of the widespread use of += et al on variables
3089 smaller than (int) or (unsigned int)) and -Wcast-qual is not possible
3090 with pngwio.c and pngwutil.c because the 'write' callback and zlib
3091 compression both fail to declare their input buffers with 'const'.
3092
3093Version 1.5.0beta56 [December 7, 2010]
3094 Added the private PNG_UNUSED() macro definition in pngpriv.h.
3095 Added some commentary about PNG_EXPORT in png.h and pngconf.h
3096 Revised PNG_EXPORT() macro and added PNG_EXPORTA() macro, with the
3097 objective of simplifying and improving the cosmetic appearance of png.h.
3098 Fixed some incorrect "=" macro names in pnglibconf.dfa
3099 Included documentation of changes in 1.5.0 from 1.4.x in libpng-manual.txt
3100
3101Version 1.5.0beta57 [December 9, 2010]
3102 Documented the pngvalid gamma error summary with additional comments and
3103 print statements.
3104 Improved missing symbol handling in checksym.awk; symbols missing in both
3105 the old and new files can now be optionally ignored, treated as errors
3106 or warnings.
3107 Removed references to pngvcrd.c and pnggccrd.c from the vstudio project.
3108 Updated "libpng14" to "libpng15" in the visualc71 project.
3109 Enabled the strip16 tests in pngvalid.`
3110 Don't display test results (except PASS/FAIL) when running "make test".
3111 Instead put them in pngtest-log.txt
3112 Added "--with-zprefix=<string>" to configure.ac
3113 Updated the prebuilt configuration files to autoconf version 2.68
3114
3115Version 1.5.0beta58 [December 19, 2010]
3116 Fixed interlace image handling and add test cases (John Bowler)
3117 Fixed the clean rule in Makefile.am to remove pngtest-log.txt
3118 Made minor changes to work around warnings in gcc 3.4
3119
3120Version 1.5.0rc01 [December 27, 2010]
3121 No changes.
3122
3123Version 1.5.0rc02 [December 27, 2010]
3124 Eliminated references to the scripts/*.def files in project/visualc71.
3125
3126Version 1.5.0rc03 [December 28, 2010]
3127 Eliminated scripts/*.def and revised Makefile.am accordingly
3128
3129Version 1.5.0rc04 [December 29, 2010]
3130 Fixed bug in background transformation handling in pngrtran.c (it was
3131 looking for the flag in png_ptr->transformations instead of in
3132 png_ptr->flags) (David Raymond).
3133
3134Version 1.5.0rc05 [December 31, 2010]
3135 Fixed typo in a comment in CMakeLists.txt (libpng14 => libpng15) (Cosmin)
3136
3137Version 1.5.0rc06 [January 4, 2011]
3138 Changed the new configure option "zprefix=string" to "zlib-prefix=string"
3139
3140Version 1.5.0rc07 [January 4, 2011]
3141 Updated copyright year.
3142
3143Version 1.5.0 [January 6, 2011]
3144 No changes.
3145
3146version 1.5.1beta01 [January 8, 2011]
3147 Added description of png_set_crc_action() to the manual.
3148 Added a note in the manual that the type of the iCCP profile was changed
3149 from png_charpp to png_bytepp in png_get_iCCP(). This change happened
3150 in version 1.5.0beta36 but is not noted in the CHANGES. Similarly,
3151 it was changed from png_charpp to png_const_bytepp in png_set_iCCP().
3152 Ensure that png_rgb_to_gray ignores palette mapped images, if libpng
3153 internally happens to call it with one, and fixed a failure to handle
3154 palette mapped images correctly. This fixes CVE-2690.
3155
3156Version 1.5.1beta02 [January 14, 2011]
3157 Fixed a bug in handling of interlaced images (bero at arklinux.org).
3158 Updated CMakeLists.txt (Clifford Yapp)
3159
3160Version 1.5.1beta03 [January 14, 2011]
3161 Fixed typecasting of some png_debug() statements (Cosmin)
3162
3163Version 1.5.1beta04 [January 16, 2011]
3164 Updated documentation of png_set|get_tRNS() (Thomas Klausner).
3165 Mentioned in the documentation that applications must #include "zlib.h"
3166 if they need access to anything in zlib.h, and that a number of
3167 macros such as png_memset() are no longer accessible by applications.
3168 Corrected pngvalid gamma test "sample" function to access all of the color
3169 samples of each pixel, instead of sampling the red channel three times.
3170 Prefixed variable names index, div, exp, gamma with "png_" to avoid "shadow"
3171 warnings, and (mistakenly) changed png_exp() to exp().
3172
3173Version 1.5.1beta05 [January 16, 2011]
3174 Changed variable names png_index, png_div, png_exp, and png_gamma to
3175 char_index, divisor, exp_b10, and gamma_val, respectively, and
3176 changed exp() back to png_exp().
3177
3178Version 1.5.1beta06 [January 20, 2011]
3179 Prevent png_push_crc_skip() from hanging while reading an unknown chunk
3180 or an over-large compressed zTXt chunk with the progressive reader.
3181 Eliminated more GCC "shadow" warnings.
3182 Revised png_fixed() in png.c to avoid compiler warning about reaching the
3183 end without returning anything.
3184
3185Version 1.5.1beta07 [January 22, 2011]
3186 In the manual, describe the png_get_IHDR() arguments in the correct order.
3187 Added const_png_structp and const_png_infop types, and used them in
3188 prototypes for most png_get_*() functions.
3189
3190Version 1.5.1beta08 [January 23, 2011]
3191 Added png_get_io_chunk_type() and deprecated png_get_io_chunk_name()
3192 Added synopses for the IO_STATE functions and other missing synopses
3193 to the manual. Removed the synopses from libpngpf.3 because they
3194 were out of date and no longer useful. Better information can be
3195 obtained by reading the prototypes and comments in pngpriv.h
3196 Attempted to fix cpp on Solaris with S. Studio 12 cc, fix build
3197 Added a make macro DFNCPP that is a CPP that will accept the tokens in
3198 a .dfn file and adds configure stuff to test for such a CPP. ./configure
3199 should fail if one is not available.
3200 Corrected const_png_ in png.h to png_const_ to avoid polluting the namespace.
3201 Added png_get_current_row_number and png_get_current_pass_number for the
3202 benefit of the user transform callback.
3203 Added png_process_data_pause and png_process_data_skip for the benefit of
3204 progressive readers that need to stop data processing or want to optimize
3205 skipping of unread data (e.g., if the reader marks a chunk to be skipped.)
3206
3207Version 1.5.1beta09 [January 24, 2011]
3208 Enhanced pngvalid, corrected an error in gray_to_rgb, corrected doc error.
3209 pngvalid contains tests of transforms, which tests are currently disabled
3210 because they are incompletely tested. gray_to_rgb was failing to expand
3211 the bit depth for smaller bit depth images; this seems to be a long
3212 standing error and resulted, apparently, in invalid output
3213 (CVE-2011-0408, CERT VU#643140). The documentation did not accurately
3214 describe what libpng really does when converting RGB to gray.
3215
3216Version 1.5.1beta10 [January 27, 2010]
3217 Fixed incorrect examples of callback prototypes in the manual, that were
3218 introduced in libpng-1.0.0.
3219 In addition the order of the png_get_uint macros with respect to the
3220 relevant function definitions has been reversed. This helps the
3221 preprocessing of the symbol files be more robust. Furthermore, the
3222 symbol file preprocessing now uses -DPNG_NO_USE_READ_MACROS even when
3223 the library may actually be built with PNG_USE_READ_MACROS; this stops
3224 the read macros interfering with the symbol file format.
3225 Made the manual, synopses, and function prototypes use the function
3226 argument names file_gamma, int_file_gamma, and srgb_intent consistently.
3227
3228Version 1.5.1beta11 [January 28, 2011]
3229 Changed PNG_UNUSED from "param=param;" to "{if(param){}}".
3230 Corrected local variable type in new API png_process_data_skip()
3231 The type was self-evidently incorrect but only causes problems on 64-bit
3232 architectures.
3233 Added transform tests to pngvalid and simplified the arguments.
3234
3235Version 1.5.1rc01 [January 29, 2011]
3236 No changes.
3237
3238Version 1.5.1rc02 [January 31, 2011]
3239 Added a request in the manual that applications do not use "png_" or
3240 "PNG_" to begin any of their own symbols.
3241 Changed PNG_UNUSED to "(void)param;" and updated the commentary in pngpriv.h
3242
3243Version 1.5.1 [February 3, 2011]
3244 No changes.
3245
3246Version 1.5.2beta01 [February 13, 2011]
3247 More -Wshadow fixes for older gcc compilers. Older gcc versions apparently
3248 check formal parameters names in function declarations (as well as
3249 definitions) to see if they match a name in the global namespace.
3250 Revised PNG_EXPORTA macro to not use an empty parameter, to accommodate the
3251 old VisualC++ preprocessor.
3252 Turned on interlace handling in png_read_png().
3253 Fixed gcc pendantic warnings.
3254 Handle longjmp in Cygwin.
3255 Fixed png_get_current_row_number() in the interlaced case.
3256 Cleaned up ALPHA flags and transformations.
3257 Implemented expansion to 16 bits.
3258
3259Version 1.5.2beta02 [February 19, 2011]
3260 Fixed mistake in the descriptions of user read_transform and write_transform
3261 function prototypes in the manual. The row_info struct is png_row_infop.
3262 Reverted png_get_current_row_number() to previous (1.5.2beta01) behavior.
3263 Corrected png_get_current_row_number documentation
3264 Fixed the read/write row callback documentation.
3265 This documents the current behavior, where the callback is called after
3266 every row with information pertaining to the next row.
3267
3268Version 1.5.2beta03 [March 3, 2011]
3269 Fixed scripts/makefile.vcwin32
3270 Updated contrib/pngsuite/README to add the word "modify".
3271 Define PNG_ALLOCATED to blank when _MSC_VER<1300.
3272
3273Version 1.5.2rc01 [March 19, 2011]
3274 Define remaining attributes to blank when MSC_VER<1300.
3275 ifdef out mask arrays in pngread.c when interlacing is not supported.
3276
3277Version 1.5.2rc02 [March 22, 2011]
3278 Added a hint to try CPP=/bin/cpp if "cpp -E" fails in scripts/pnglibconf.mak
3279 and in contrib/pngminim/*/makefile, eg., on SunOS 5.10, and removed "strip"
3280 from the makefiles.
3281 Fixed a bug (present since libpng-1.0.7) that makes png_handle_sPLT() fail
3282 to compile when PNG_NO_POINTER_INDEXING is defined (Chubanov Kirill)
3283
3284Version 1.5.2rc03 [March 24, 2011]
3285 Don't include standard header files in png.h while building the symbol table,
3286 to avoid cpp failure on SunOS (introduced PNG_BUILDING_SYMBOL_TABLE macro).
3287
3288Version 1.5.2 [March 31, 2011]
3289 No changes.
3290
3291Version 1.5.3beta01 [April 1, 2011]
3292 Re-initialize the zlib compressor before compressing non-IDAT chunks.
3293 Added API functions (png_set_text_compression_level() and four others) to
3294 set parameters for zlib compression of non-IDAT chunks.
3295
3296Version 1.5.3beta02 [April 3, 2011]
3297 Updated scripts/symbols.def with new API functions.
3298 Only compile the new zlib re-initializing code when text or iCCP is
3299 supported, using PNG_WRITE_COMPRESSED_TEXT_SUPPORTED macro.
3300 Improved the optimization of the zlib CMF byte (see libpng-1.2.6beta03).
3301 Optimize the zlib CMF byte in non-IDAT compressed chunks
3302
3303Version 1.5.3beta03 [April 16, 2011]
3304 Fixed gcc -ansi -pedantic compile. A strict ANSI system does not have
3305 snprintf, and the "__STRICT_ANSI__" detects that condition more reliably
3306 than __STDC__ (John Bowler).
3307 Removed the PNG_PTR_NORETURN attribute because it too dangerous. It tells
3308 the compiler that a user supplied callback (the error handler) does not
3309 return, yet there is no guarantee in practice that the application code
3310 will correctly implement the error handler because the compiler only
3311 issues a warning if there is a mistake (John Bowler).
3312 Removed the no-longer-used PNG_DEPSTRUCT macro.
3313 Updated the zlib version to 1.2.5 in the VStudio project.
3314 Fixed 64-bit builds where png_uint_32 is smaller than png_size_t in
3315 pngwutil.c (John Bowler).
3316 Fixed bug with stripping the filler or alpha channel when writing, that
3317 was introduced in libpng-1.5.2beta01 (bug report by Andrew Church).
3318
3319Version 1.5.3beta04 [April 27, 2011]
3320 Updated pngtest.png with the new zlib CMF optimization.
3321 Cleaned up conditional compilation code and of background/gamma handling
3322 Internal changes only except a new option to avoid compiling the
3323 png_build_grayscale_palette API (which is not used at all internally.)
3324 The main change is to move the transform tests (READ_TRANSFORMS,
3325 WRITE_TRANSFORMS) up one level to the caller of the APIs. This avoids
3326 calls to spurious functions if all transforms are disabled and slightly
3327 simplifies those functions. Pngvalid modified to handle this.
3328 A minor change is to stop the strip_16 and expand_16 interfaces from
3329 disabling each other; this allows the future alpha premultiplication
3330 code to use 16-bit intermediate values while still producing 8-bit output.
3331 png_do_background and png_do_gamma have been simplified to take a single
3332 pointer to the png_struct rather than pointers to every item required
3333 from the png_struct. This makes no practical difference to the internal
3334 code.
3335 A serious bug in the pngvalid internal routine 'standard_display_init' has
3336 been fixed - this failed to initialize the red channel and accidentally
3337 initialized the alpha channel twice.
3338 Changed png_struct jmp_buf member name from png_jmpbuf to tmp_jmpbuf to
3339 avoid a possible clash with the png_jmpbuf macro on some platforms.
3340
3341Version 1.5.3beta05 [May 6, 2011]
3342 Added the "_POSIX_SOURCE" feature test macro to ensure libpng sees the
3343 correct API. _POSIX_SOURCE is defined in pngpriv.h, pngtest.c and
3344 pngvalid.c to ensure that POSIX conformant systems disable non-POSIX APIs.
3345 Removed png_snprintf and added formatted warning messages. This change adds
3346 internal APIs to allow png_warning messages to have parameters without
3347 requiring the host OS to implement snprintf. As a side effect the
3348 dependency of the tIME-supporting RFC1132 code on stdio is removed and
3349 PNG_NO_WARNINGS does actually work now.
3350 Pass "" instead of '\0' to png_default_error() in png_err(). This mistake
3351 was introduced in libpng-1.2.20beta01. This fixes CVE-2011-2691.
3352 Added PNG_WRITE_OPTIMIZE_CMF_SUPPORTED macro to make the zlib "CMF" byte
3353 optimization configureable.
3354 IDAT compression failed if preceded by a compressed text chunk (bug
3355 introduced in libpng-1.5.3beta01-02). This was because the attempt to
3356 reset the zlib stream in png_write_IDAT happened after the first IDAT
3357 chunk had been deflated - much too late. In this change internal
3358 functions were added to claim/release the z_stream and, hopefully, make
3359 the code more robust. Also deflateEnd checking is added - previously
3360 libpng would ignore an error at the end of the stream.
3361
3362Version 1.5.3beta06 [May 8, 2011]
3363 Removed the -D_ALL_SOURCE from definitions for AIX in CMakeLists.txt
3364 Implemented premultiplied alpha support: png_set_alpha_mode API
3365
3366Version 1.5.3beta07 [May 11, 2011]
3367 Added expand_16 support to the high level interface.
3368 Added named value and 'flag' gamma support to png_set_gamma. Made a minor
3369 change from the previous (unreleased) ABI/API to hide the exact value used
3370 for Macs - it's not a good idea to embed this in the ABI!
3371 Moved macro definitions for PNG_HAVE_IHDR, PNG_HAVE_PLTE, and PNG_AFTER_IDAT
3372 from pngpriv.h to png.h because they must be visible to applications
3373 that call png_set_unknown_chunks().
3374 Check for up->location !PNG_AFTER_IDAT when writing unknown chunks
3375 before IDAT.
3376
3377Version 1.5.3beta08 [May 16, 2011]
3378 Improved "pngvalid --speed" to exclude more of pngvalid from the time.
3379 Documented png_set_alpha_mode(), other changes in libpng.3/libpng-manual.txt
3380 The cHRM chunk now sets the defaults for png_set_rgb_to_gray() (when negative
3381 parameters are supplied by the caller), while in the absence of cHRM
3382 sRGB/Rec 709 values are still used. This introduced a divide-by-zero
3383 bug in png_handle_cHRM().
3384 The bKGD chunk no longer overwrites the background value set by
3385 png_set_background(), allowing the latter to be used before the file
3386 header is read. It never performed any useful function to override
3387 the default anyway.
3388 Added memory overwrite and palette image checks to pngvalid.c
3389 Previously palette image code was poorly checked. Since the transformation
3390 code has a special palette path in most cases this was a severe weakness.
3391 Minor cleanup and some extra checking in pngrutil.c and pngrtran.c. When
3392 expanding an indexed image, always expand to RGBA if transparency is
3393 present.
3394
3395Version 1.5.3beta09 [May 17, 2011]
3396 Reversed earlier 1.5.3 change of transformation order; move png_expand_16
3397 back where it was. The change doesn't work because it requires 16-bit
3398 gamma tables when the code only generates 8-bit ones. This fails
3399 silently; the libpng code just doesn't do any gamma correction. Moving
3400 the tests back leaves the old, inaccurate, 8-bit gamma calculations, but
3401 these are clearly better than none!
3402
3403Version 1.5.3beta10 [May 20, 2011]
3404
3405 png_set_background() and png_expand_16() did not work together correctly.
3406 This problem is present in 1.5.2; if png_set_background is called with
3407 need_expand false and the matching 16 bit color libpng erroneously just
3408 treats it as an 8-bit color because of where png_do_expand_16 is in the
3409 transform list. This simple fix reduces the supplied colour to 8-bits,
3410 so it gets smashed, but this is better than the current behavior.
3411 Added tests for expand16, more fixes for palette image tests to pngvalid.
3412 Corrects the code for palette image tests and disables attempts to
3413 validate palette colors.
3414
3415Version 1.5.3rc01 [June 3, 2011]
3416 No changes.
3417
3418Version 1.5.3rc02 [June 8, 2011]
3419 Fixed uninitialized memory read in png_format_buffer() (Bug report by
3420 Frank Busse, CVE-2011-2501, related to CVE-2004-0421).
3421
3422Version 1.5.3beta11 [June 11, 2011]
3423 Fixed png_handle_sCAL which is broken in 1.5. This fixes CVE 2011-2692.
3424 Added sCAL to pngtest.png
3425 Revised documentation about png_set_user_limits() to say that it also affects
3426 png writing.
3427 Revised handling of png_set_user_limits() so that it can increase the
3428 limit beyond the PNG_USER_WIDTH|HEIGHT_MAX; previously it could only
3429 reduce it.
3430 Make the 16-to-8 scaling accurate. Dividing by 256 with no rounding is
3431 wrong (high by one) 25% of the time. Dividing by 257 with rounding is
3432 wrong in 128 out of 65536 cases. Getting the right answer all the time
3433 without division is easy.
3434 Added "_SUPPORTED" to the PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION macro.
3435 Added projects/owatcom, an IDE project for OpenWatcom to replace
3436 scripts/makefile.watcom. This project works with OpenWatcom 1.9. The
3437 IDE autogenerates appropriate makefiles (libpng.mk) for batch processing.
3438 The project is configurable, unlike the Visual Studio project, so long
3439 as the developer has an awk.
3440 Changed png_set_gAMA to limit the gamma value range so that the inverse
3441 of the stored value cannot overflow the fixed point representation,
3442 and changed other things OpenWatcom warns about.
3443 Revised pngvalid.c to test PNG_ALPHA_MODE_SUPPORTED correctly. This allows
3444 pngvalid to build when ALPHA_MODE is not supported, which is required if
3445 it is to build on libpng 1.4.
3446 Removed string/memory macros that are no longer used and are not
3447 necessarily fully supportable, particularly png_strncpy and png_snprintf.
3448 Added log option to pngvalid.c and attempted to improve gamma messages.
3449
3450Version 1.5.3 [omitted]
3451 People found the presence of a beta release following an rc release
3452 to be confusing; therefore we bump the version to libpng-1.5.4beta01
3453 and there will be no libpng-1.5.3 release.
3454
3455Version 1.5.4beta01 [June 14, 2011]
3456 Made it possible to undefine PNG_READ_16_TO_8_ACCURATE_SCALE_SUPPORTED
3457 to get the same (inaccurate) output as libpng-1.5.2 and earlier.
3458 Moved definitions of PNG_HAVE_IHDR, PNG_AFTER_IDAT, and PNG_HAVE_PLTE
3459 outside of an unknown-chunk block in png.h because they are also
3460 needed for other uses.
3461
3462Version 1.5.4beta02 [June 14, 2011]
3463 Fixed and clarified LEGACY 16-to-8 scaling code.
3464 Added png_set_chop_16() API, to match inaccurate results from previous
3465 libpng versions.
3466 Removed the ACCURATE and LEGACY options (they are no longer useable)
3467 Use the old scaling method for background if png_set_chop_16() was
3468 called.
3469 Made png_set_chop_16() API removeable by disabling PNG_CHOP_16_TO_8_SUPPORTED
3470
3471Version 1.5.4beta03 [June 15, 2011]
3472 Fixed a problem in png_do_expand_palette() exposed by optimization in
3473 1.5.3beta06
3474 Also removed a spurious and confusing "trans" member ("trans") from png_info.
3475 The palette expand optimization prevented expansion to an intermediate RGBA
3476 form if tRNS was present but alpha was marked to be stripped; this exposed
3477 a check for tRNS in png_do_expand_palette() which is inconsistent with the
3478 code elsewhere in libpng.
3479 Correction to the expand_16 code; removed extra instance of
3480 png_set_scale_16_to_8 from pngpriv.h
3481
3482Version 1.5.4beta04 [June 16, 2011]
3483 Added a missing "#ifdef PNG_READ_BACKGROUND_SUPPORTED/#endif" in pngrtran.c
3484 Added PNG_TRANSFORM_CHOP_16 to the high-level read transforms.
3485 Made PNG_READ_16_TO_8_ACCURATE_SCALE configurable again. If this is
3486 not enabled, png_set_strip_16() and png_do_scale_16_to_8() aren't built.
3487 Revised contrib/visupng, gregbook, and pngminim to demonstrate chop_16_to_8
3488
3489Version 1.5.4beta05 [June 16, 2011]
3490 Renamed png_set_strip_16() to png_set_scale_16() and renamed
3491 png_set_chop_16() to png_set_strip(16) in an attempt to minimize the
3492 behavior changes between libpng14 and libpng15.
3493
3494Version 1.5.4beta06 [June 18, 2011]
3495 Fixed new bug that was causing both strip_16 and scale_16 to be applied.
3496
3497Version 1.5.4beta07 [June 19, 2011]
3498 Fixed pngvalid, simplified macros, added checking for 0 in sCAL.
3499 The ACCURATE scale macro is no longer defined in 1.5 - call the
3500 png_scale_16_to_8 API. Made sure that PNG_READ_16_TO_8 is still defined
3501 if the png_strip_16_to_8 API is present. png_check_fp_number now
3502 maintains some state so that positive, negative and zero values are
3503 identified. sCAL uses these to be strictly spec conformant.
3504
3505Version 1.5.4beta08 [June 23, 2011]
3506 Fixed pngvalid if ACCURATE_SCALE is defined.
3507 Updated scripts/pnglibconf.h.prebuilt.
3508
3509Version 1.5.4rc01 [June 30, 2011]
3510 Define PNG_ALLOCATED to "restrict" only if MSC_VER >= 1400.
3511
3512Version 1.5.4 [July 7, 2011]
3513 No changes.
3514
3515Version 1.5.5beta01 [July 13, 2011]
3516 Fixed some typos and made other minor changes in the manual.
3517 Updated contrib/pngminus/makefile.std (Samuli Souminen)
3518
3519Version 1.5.5beta02 [July 14, 2011]
3520 Revised Makefile.am and Makefile.in to look in the right directory for
3521 pnglibconf.h.prebuilt
3522
3523Version 1.5.5beta03 [July 27, 2011]
3524 Enabled compilation with g++ compiler. This compiler does not recognize
3525 the file extension, so it always compiles with C++ rules. Made minor
3526 changes to pngrutil.c to cast results where C++ expects it but C does not.
3527 Minor editing of libpng.3 and libpng-manual.txt.
3528
3529Version 1.5.5beta04 [July 29, 2011]
3530 Revised CMakeLists.txt (Clifford Yapp)
3531 Updated commentary about the png_rgb_to_gray() default coefficients
3532 in the manual and in pngrtran.c
3533
3534Version 1.5.5beta05 [August 17, 2011]
3535 Prevent unexpected API exports from non-libpng DLLs on Windows. The "_DLL"
3536 is removed from the test of whether a DLL is being built (this erroneously
3537 caused the libpng APIs to be marked as DLL exports in static builds under
3538 Microsoft Visual Studio). Almost all of the libpng building configuration
3539 is moved from pngconf.h to pngpriv.h, but PNG_DLL_EXPORT remains in
3540 pngconf.h, though, so that it is colocated with the import definition (it
3541 is no longer used anywhere in the installed headers). The VStudio project
3542 definitions have been cleaned up: "_USRDLL" has been removed from the
3543 static library builds (this was incorrect), and PNG_USE_DLL has been added
3544 to pngvalid to test the functionality (pngtest does not supply it,
3545 deliberately). The spurious "_EXPORTS" has been removed from the
3546 libpng build (all these errors were a result of copy/paste between project
3547 configurations.)
3548 Added new types and internal functions for CIE RGB end point handling to
3549 pngpriv.h (functions yet to be implemented).
3550
3551Version 1.5.5beta06 [August 26, 2011]
3552 Ensure the CMAKE_LIBRARY_OUTPUT_DIRECTORY is set in CMakeLists.txt
3553 (Clifford Yap)
3554 Fixes to rgb_to_gray and cHRM XYZ APIs (John Bowler):
3555 The rgb_to_gray code had errors when combined with gamma correction.
3556 Some pixels were treated as true grey when they weren't and such pixels
3557 and true grey ones were not gamma corrected (the original value of the
3558 red component was used instead). APIs to get and set cHRM using color
3559 space end points have been added and the rgb_to_gray code that defaults
3560 based on cHRM, and the divide-by-zero bug in png_handle_cHRM (CERT
3561 VU#477046, CVE-2011-3328, introduced in 1.5.4) have been corrected.
3562 A considerable number of tests has been added to pngvalid for the
3563 rgb_to_gray transform.
3564 Arithmetic errors in rgb_to_gray whereby the calculated gray value was
3565 truncated to the bit depth rather than rounded have been fixed except in
3566 the 8-bit non-gamma-corrected case (where consistency seems more important
3567 than correctness.) The code still has considerable inaccuracies in the
3568 8-bit case because 8-bit linear arithmetic is used.
3569
3570Version 1.5.5beta07 [September 7, 2011]
3571 Added "$(ARCH)" option to makefile.darwin
3572 Added SunOS support to configure.ac and Makefile.am
3573 Changed png_chunk_benign_error() to png_warning() in png.c, in
3574 png_XYZ_from_xy_checked().
3575
3576Version 1.5.5beta08 [September 10, 2011]
3577 Fixed 64-bit compilation errors (gcc). The errors fixed relate
3578 to conditions where types that are 32 bits in the GCC 32-bit
3579 world (uLong and png_size_t) become 64 bits in the 64-bit
3580 world. This produces potential truncation errors which the
3581 compiler correctly flags.
3582 Relocated new HAVE_SOLARIS_LD definition in configure.ac
3583 Constant changes for 64-bit compatibility (removal of L suffixes). The
3584 16-bit cases still use "L" as we don't have a 16-bit test system.
3585
3586Version 1.5.5rc01 [September 15, 2011]
3587 Removed "L" suffixes in pngpriv.h
3588
3589Version 1.5.5 [September 22, 2011]
3590 No changes.
3591
3592Version 1.5.6beta01 [September 22, 2011]
3593 Fixed some 64-bit type conversion warnings in pngrtran.c
3594 Moved row_info from png_struct to a local variable.
3595 The various interlace mask arrays have been made into arrays of
3596 bytes and made PNG_CONST and static (previously some arrays were
3597 marked PNG_CONST and some weren't).
3598 Additional checks have been added to the transform code to validate the
3599 pixel depths after the transforms on both read and write.
3600 Removed some redundant code from pngwrite.c, in png_destroy_write_struct().
3601 Changed chunk reading/writing code to use png_uint_32 instead of png_byte[4].
3602 This removes the need to allocate temporary strings for chunk names on
3603 the stack in the read/write code. Unknown chunk handling still uses the
3604 string form because this is exposed in the API.
3605
3606Version 1.5.6beta02 [September 26, 2011]
3607 Added a note in the manual the png_read_update_info() must be called only
3608 once with a particular info_ptr.
3609 Fixed a typo in the definition of the new PNG_STRING_FROM_CHUNK(s,c) macro.
3610
3611Version 1.5.6beta03 [September 28, 2011]
3612 Revised test-pngtest.sh to report FAIL when pngtest fails.
3613 Added "--strict" option to pngtest, to report FAIL when the failure is
3614 only because the resulting valid files are different.
3615 Revised CMakeLists.txt to work with mingw and removed some material from
3616 CMakeLists.txt that is no longer useful in libpng-1.5.
3617
3618Version 1.5.6beta04 [October 5, 2011]
3619 Fixed typo in Makefile.in and Makefile.am ("-M Wl" should be "-M -Wl")."
3620
3621Version 1.5.6beta05 [October 12, 2011]
3622 Speed up png_combine_row() for interlaced images. This reduces the generality
3623 of the code, allowing it to be optimized for Adam7 interlace. The masks
3624 passed to png_combine_row() are now generated internally, avoiding
3625 some code duplication and localizing the interlace handling somewhat.
3626 Align png_struct::row_buf - previously it was always unaligned, caused by
3627 a bug in the code that attempted to align it; the code needs to subtract
3628 one from the pointer to take account of the filter byte prepended to
3629 each row.
3630 Optimized png_combine_row() when rows are aligned. This gains a small
3631 percentage for 16-bit and 32-bit pixels in the typical case where the
3632 output row buffers are appropriately aligned. The optimization was not
3633 previously possible because the png_struct buffer was always misaligned.
3634 Fixed bug in png_write_chunk_header() debug print, introduced in 1.5.6beta01.
3635
3636Version 1.5.6beta06 [October 17, 2011]
3637 Removed two redundant tests for unitialized row.
3638 Fixed a relatively harmless memory overwrite in compressed text writing
3639 with a 1 byte zlib buffer.
3640 Add ability to call png_read_update_info multiple times to pngvalid.c.
3641 Fixes for multiple calls to png_read_update_info. These fixes attend to
3642 most of the errors revealed in pngvalid, however doing the gamma work
3643 twice results in inaccuracies that can't be easily fixed. There is now
3644 a warning in the code if this is going to happen.
3645 Turned on multiple png_read_update_info in pngvalid transform tests.
3646 Prevent libpng from overwriting unused bits at the end of the image when
3647 it is not byte aligned, while reading. Prior to libpng-1.5.6 libpng would
3648 overwrite the partial byte at the end of each row if the row width was not
3649 an exact multiple of 8 bits and the image is not interlaced.
3650
3651Version 1.5.6beta07 [October 21, 2011]
3652 Made png_ptr->prev_row an aligned pointer into png_ptr->big_prev_row
3653 (Mans Rullgard).
3654
3655Version 1.5.6rc01 [October 26, 2011]
3656 Changed misleading "Missing PLTE before cHRM" warning to "Out of place cHRM"
3657
3658Version 1.5.6rc02 [October 27, 2011]
3659 Added LSR() macro to defend against buggy compilers that evaluate non-taken
3660 code branches and complain about out-of-range shifts.
3661
3662Version 1.5.6rc03 [October 28, 2011]
3663 Renamed the LSR() macro to PNG_LSR() and added PNG_LSL() macro.
3664 Fixed compiler warnings with Intel and MSYS compilers. The logical shift
3665 fix for Microsoft Visual C is required by other compilers, so this
3666 enables that fix for all compilers when using compile-time constants.
3667 Under MSYS 'byte' is a name declared in a system header file, so we
3668 changed the name of a local variable to avoid the warnings that result.
3669 Added #define PNG_ALIGN_TYPE PNG_ALIGN_NONE to contrib/pngminim/*/pngusr.h
3670
3671Version 1.5.6 [November 3, 2011]
3672 No changes.
3673
3674Version 1.5.7beta01 [November 4, 2011]
3675 Added support for ARM processor, when decoding all PNG up-filtered rows
3676 and any other-filtered rows with 3 or 4 bytes per pixel (Mans Rullgard).
3677 Fixed bug in pngvalid on early allocation failure; fixed type cast in
3678 pngmem.c; pngvalid would attempt to call png_error() if the allocation
3679 of a png_struct or png_info failed. This would probably have led to a
3680 crash. The pngmem.c implementation of png_malloc() included a cast
3681 to png_size_t which would fail on large allocations on 16-bit systems.
3682 Fix for the preprocessor of the Intel C compiler. The preprocessor
3683 splits adjacent @ signs with a space; this changes the concatentation
3684 token from @-@-@ to PNG_JOIN; that should work with all compiler
3685 preprocessors.
3686 Paeth filter speed improvements from work by Siarhei Siamashka. This
3687 changes the 'Paeth' reconstruction function to improve the GCC code
3688 generation on x86. The changes are only part of the suggested ones;
3689 just the changes that definitely improve speed and remain simple.
3690 The changes also slightly increase the clarity of the code.
3691
3692Version 1.5.7beta02 [November 11, 2011]
3693 Check compression_type parameter in png_get_iCCP and remove spurious
3694 casts. The compression_type parameter is always assigned to, so must
3695 be non-NULL. The cast of the profile length potentially truncated the
3696 value unnecessarily on a 16-bit int system, so the cast of the (byte)
3697 compression type to (int) is specified by ANSI-C anyway.
3698 Fixed FP division by zero in pngvalid.c; the 'test_pixel' code left
3699 the sBIT fields in the test pixel as 0, which resulted in a floating
3700 point division by zero which was irrelevant but causes systems where
3701 FP exceptions cause a crash. Added code to pngvalid to turn on FP
3702 exceptions if the appropriate glibc support is there to ensure this is
3703 tested in the future.
3704 Updated scripts/pnglibconf.mak and scripts/makefile.std to handle the
3705 new PNG_JOIN macro.
3706 Added versioning to pnglibconf.h comments.
3707 Simplified read/write API initial version; basic read/write tested on
3708 a variety of images, limited documentation (in the header file.)
3709 Installed more accurate linear to sRGB conversion tables. The slightly
3710 modified tables reduce the number of 16-bit values that
3711 convert to an off-by-one 8-bit value. The "makesRGB.c" code that was used
3712 to generate the tables is now in a contrib/sRGBtables sub-directory.
3713
3714Version 1.5.7beta03 [November 17, 2011]
3715 Removed PNG_CONST from the sRGB table declarations in pngpriv.h and png.c
3716 Added run-time detection of NEON support.
3717 Added contrib/libtests; includes simplified API test and timing test and
3718 a color conversion utility for rapid checking of failed 'pngstest' results.
3719 Multiple transform bug fixes plus a work-round for double gamma correction.
3720 libpng does not support more than one transform that requires linear data
3721 at once - if this is tried typically the results is double gamma
3722 correction. Since the simplified APIs can need rgb to gray combined with
3723 a compose operation it is necessary to do one of these outside the main
3724 libpng transform code. This check-in also contains fixes to various bugs
3725 in the simplified APIs themselves and to some bugs in compose and rgb to
3726 gray (on palette) itself.
3727 Fixes for C++ compilation using g++ When libpng source is compiled
3728 using g++. The compiler imposes C++ rules on the C source; thus it
3729 is desireable to make the source work with either C or C++ rules
3730 without throwing away useful error information. This change adds
3731 png_voidcast to allow C semantic (void*) cases or the corresponding
3732 C++ static_cast operation, as appropriate.
3733 Added --noexecstack to assembler file compilation. GCC does not set
3734 this on assembler compilation, even though it does on C compilation.
3735 This creates security issues if assembler code is enabled; the
3736 work-around is to set it by default in the flags for $(CCAS)
3737 Work around compilers that don't support declaration of const data. Some
3738 compilers fault 'extern const' data declarations (because the data is
3739 not initialized); this turns on const-ness only for compilers where
3740 this is known to work.
3741
3742Version 1.5.7beta04 [November 17, 2011]
3743 Since the gcc driver does not recognize the --noexecstack flag, we must
3744 use the -Wa prefix to have it passed through to the assembler.
3745 Also removed a duplicate setting of this flag.
3746 Added files that were omitted from the libpng-1.5.7beta03 zip distribution.
3747
3748Version 1.5.7beta05 [November 25, 2011]
3749 Removed "zTXt" from warning in generic chunk decompression function.
3750 Validate time settings passed to pngset() and png_convert_to_rfc1123()
3751 (Frank Busse).
3752 Added MINGW support to CMakeLists.txt
3753 Reject invalid compression flag or method when reading the iTXt chunk.
3754 Backed out 'simplified' API changes. The API seems too complex and there
3755 is a lack of consensus or enthusiasm for the proposals. The API also
3756 reveals significant bugs inside libpng (double gamma correction and the
3757 known bug of being unable to retrieve a corrected palette). It seems
3758 better to wait until the bugs, at least, are corrected.
3759 Moved pngvalid.c into contrib/libtests
3760 Rebuilt Makefile.in, configure, etc., with autoconf-2.68
3761
3762Version 1.5.7rc01 [December 1, 2011]
3763 Replaced an "#if" with "#ifdef" in pngrtran.c
3764 Revised #if PNG_DO_BC block in png.c (use #ifdef and add #else)
3765
3766Version 1.5.7rc02 [December 5, 2011]
3767 Revised project files and contrib/pngvalid/pngvalid.c to account for
3768 the relocation of pngvalid into contrib/libtests.
3769 Revised pngconf.h to use " __declspec(restrict)" only when MSC_VER >= 1400,
3770 as in libpng-1.5.4.
3771 Put CRLF line endings in the owatcom project files.
3772
3773Version 1.5.7rc03 [December 7, 2011]
3774 Updated CMakeLists.txt to account for the relocation of pngvalid.c
3775
3776Version 1.5.7 [December 15, 2011]
3777 Minor fixes to pngvalid.c for gcc 4.6.2 compatibility to remove warnings
3778 reported by earlier versions.
3779 Fixed minor memset/sizeof errors in pngvalid.c.
3780
3781Version 1.6.0beta01 [December 15, 2011]
3782 Removed machine-generated configure files from the GIT repository (they will
3783 continue to appear in the tarball distributions and in the libpng15 and
3784 earlier GIT branches).
3785 Restored the new 'simplified' API, which was started in libpng-1.5.7beta02
3786 but later deleted from libpng-1.5.7beta05.
3787 Added example programs for the new 'simplified' API.
3788 Added ANSI-C (C90) headers and require them, and take advantage of the
3789 change. Also fixed some of the projects/* and contrib/* files that needed
3790 updates for libpng16 and the move of pngvalid.c.
3791 With this change the required ANSI-C header files are assumed to exist: the
3792 implementation must provide float.h, limits.h, stdarg.h and stddef.h and
3793 libpng relies on limits.h and stddef.h existing and behaving as defined
3794 (the other two required headers aren't used). Non-ANSI systems that don't
3795 have stddef.h or limits.h will have to provide an appropriate fake
3796 containing the relevant types and #defines.
3797 The use of FAR/far has been eliminated and the definition of png_alloc_size_t
3798 is now controlled by a flag so that 'small size_t' systems can select it
3799 if necessary. Libpng 1.6 may not currently work on such systems -- it
3800 seems likely that it will ask 'malloc' for more than 65535 bytes with any
3801 image that has a sufficiently large row size (rather than simply failing
3802 to read such images).
3803 New tools directory containing tools used to generate libpng code.
3804 Fixed race conditions in parallel make builds. With higher degrees of
3805 parallelism during 'make' the use of the same temporary file names such
3806 as 'dfn*' can result in a race where a temporary file from one arm of the
3807 build is deleted or overwritten in another arm. This changes the
3808 temporary files for suffix rules to always use $* and ensures that the
3809 non-suffix rules use unique file names.
3810
3811Version 1.6.0beta02 [December 21, 2011]
3812 Correct configure builds where build and source directories are separate.
3813 The include path of 'config.h' was erroneously made relative in pngvalid.c
3814 in libpng 1.5.7.
3815
3816Version 1.6.0beta03 [December 22, 2011]
3817 Start-up code size improvements, error handler flexibility. These changes
3818 alter how the tricky allocation of the initial png_struct and png_info
3819 structures are handled. png_info is now handled in pretty much the same
3820 way as everything else, except that the allocations handle NULL return
3821 silently. png_struct is changed in a similar way on allocation and on
3822 deallocation a 'safety' error handler is put in place (which should never
3823 be required). The error handler itself is changed to permit mismatches
3824 in the application and libpng error buffer size; however, this means a
3825 silent change to the API to return the jmp_buf if the size doesn't match
3826 the size from the libpng compilation; libpng now allocates the memory and
3827 this may fail. Overall these changes result in slight code size
3828 reductions; however, this is a reduction in code that is always executed
3829 so is particularly valuable. Overall on a 64-bit system the libpng DLL
3830 decreases in code size by 1733 bytes. pngerror.o increases in size by
3831 about 465 bytes because of the new functionality.
3832 Added png_convert_to_rfc1123_buffer() and deprecated png_convert_to_rfc1123()
3833 to avoid including a spurious buffer in the png_struct.
3834
3835Version 1.6.0beta04 [December 30, 2011]
3836 Regenerated configure scripts with automake-1.11.2
3837 Eliminated png_info_destroy(). It is now used only in png.c and only calls
3838 one other internal function and memset().
3839 Enabled png_get_sCAL_fixed() if floating point APIs are enabled. Previously
3840 it was disabled whenever internal fixed point arithmetic was selected,
3841 which meant it didn't exist even on systems where FP was available but not
3842 preferred.
3843 Added pngvalid.c compile time checks for const APIs.
3844 Implemented 'restrict' for png_info and png_struct. Because of the way
3845 libpng works both png_info and png_struct are always accessed via a
3846 single pointer. This means adding C99 'restrict' to the pointer gives
3847 the compiler some opportunity to optimize the code. This change allows
3848 that.
3849 Moved AC_MSG_CHECKING([if libraries can be versioned]) later to the proper
3850 location in configure.ac (Gilles Espinasse).
3851 Changed png_memcpy to C assignment where appropriate. Changed all those
3852 uses of png_memcpy that were doing a simple assignment to assignments
3853 (all those cases where the thing being copied is a non-array C L-value).
3854 Added some error checking to png_set_*() routines.
3855 Removed the reference to the non-exported function png_memcpy() from
3856 example.c.
3857 Fixed the Visual C 64-bit build - it requires jmp_buf to be aligned, but
3858 it had become misaligned.
3859 Revised contrib/pngminus/pnm2png.c to avoid warnings when png_uint_32
3860 and unsigned long are of different sizes.
3861
3862Version 1.6.0beta05 [January 15, 2012]
3863 Updated manual with description of the simplified API (copied from png.h)
3864 Fix bug in pngerror.c: some long warnings were being improperly truncated
3865 (CVE-2011-3464, bug introduced in libpng-1.5.3beta05).
3866
3867Version 1.6.0beta06 [January 24, 2012]
3868 Added palette support to the simplified APIs. This commit
3869 changes some of the macro definitions in png.h, app code
3870 may need corresponding changes.
3871 Increased the formatted warning buffer to 192 bytes.
3872 Added color-map support to simplified API. This is an initial version for
3873 review; the documentation has not yet been updated.
3874 Fixed Min/GW uninstall to remove libpng.dll.a
3875
3876Version 1.6.0beta07 [January 28, 2012]
3877 Eliminated Intel icc/icl compiler warnings. The Intel (GCC derived)
3878 compiler issues slightly different warnings from those issued by the
3879 current vesions of GCC. This eliminates those warnings by
3880 adding/removing casts and small code rewrites.
3881 Updated configure.ac from autoupdate: added --enable-werror option.
3882 Also some layout regularization and removal of introduced tab characters
3883 (replaced with 3-character indentation). Obsolete macros identified by
3884 autoupdate have been removed; the replacements are all in 2.59 so
3885 the pre-req hasn't been changed. --enable-werror checks for support
3886 for -Werror (or the given argument) in the compiler. This mimics the
3887 gcc configure option by allowing -Werror to be turned on safely; without
3888 the option the tests written in configure itself fail compilation because
3889 they cause compiler warnings.
3890 Rewrote autogen.sh to run autoreconf instead of running tools one-by-one.
3891 Conditionalize the install rules for MINGW and CYGWIN in CMakeLists.txt and
3892 set CMAKE_LIBRARY_OUTPUT_DIRECTORY to "lib" on all platforms (C. Yapp).
3893 Freeze libtool files in the 'scripts' directory. This version of autogen.sh
3894 attempts to dissuade people from running it when it is not, or should not,
3895 be necessary. In fact, autogen.sh does not work when run in a libpng
3896 directory extracted from a tar distribution anymore. You must run it in
3897 a GIT clone instead.
3898 Added two images to contrib/pngsuite (1-bit and 2-bit transparent grayscale),
3899 and renamed three whose names were inconsistent with those in
3900 pngsuite/README.txt.
3901
3902Version 1.6.0beta08 [February 1, 2012]
3903 Fixed Image::colormap misalignment in pngstest.c
3904 Check libtool/libtoolize version number (2.4.2) in configure.ac
3905 Divide test-pngstest.sh into separate pngstest runs for basic and
3906 transparent images.
3907 Moved automake options to AM_INIT_AUTOMAKE in configure.ac
3908 Added color-tests, silent-rules (Not yet implemented in Makefile.am) and
3909 version checking to configure.ac
3910 Improved pngstest speed by not doing redundant tests and add const to
3911 the background parameter of png_image_finish_read. The --background
3912 option is now done automagically only when required, so that commandline
3913 option no longer exists.
3914 Cleaned up pngpriv.h to consistently declare all functions and data.
3915 Also eliminated PNG_CONST_DATA, which is apparently not needed but we
3916 can't be sure until it is gone.
3917 Added symbol prefixing that allows all the libpng external symbols
3918 to be prefixed (suggested by Reuben Hawkins).
3919 Updated "ftbb*.png" list in the owatcom and vstudio projects.
3920 Fixed 'prefix' builds on clean systems. The generation of pngprefix.h
3921 should not require itself.
3922 Updated INSTALL to explain that autogen.sh must be run in a GIT clone,
3923 not in a libpng directory extracted from a tar distribution.
3924
3925Version 1.6.0beta09 [February 1, 2012]
3926 Reverted the prebuilt configure files to libpng-1.6.0beta05 condition.
3927
3928Version 1.6.0beta10 [February 3, 2012]
3929 Added Z_SOLO for zlib-1.2.6+ and correct pngstest tests
3930 Updated list of test images in CMakeLists.txt
3931 Updated the prebuilt configure files to current condition.
3932 Revised INSTALL information about autogen.sh; it works in tar distributions.
3933
3934Version 1.6.0beta11 [February 16, 2012]
3935 Fix character count in pngstest command in projects/owatcom/pngstest.tgt
3936 Revised test-pngstest.sh to report PASS/FAIL for each image.
3937 Updated documentation about the simplified API.
3938 Corrected estimate of error in libpng png_set_rgb_to_gray API. The API is
3939 extremely inaccurate for sRGB conversions because it uses an 8-bit
3940 intermediate linear value and it does not use the sRGB transform, so it
3941 suffers from the known instability in gamma transforms for values close
3942 to 0 (see Poynton). The net result is that the calculation has a maximum
3943 error of 14.99/255; 0.5/255^(1/2.2). pngstest now uses 15 for the
3944 permitted 8-bit error. This may still not be enough because of arithmetic
3945 error.
3946 Removed some unused arrays (with #ifdef) from png_read_push_finish_row().
3947 Fixed a memory overwrite bug in simplified read of RGB PNG with
3948 non-linear gamma Also bugs in the error checking in pngread.c and changed
3949 quite a lot of the checks in pngstest.c to be correct; either correctly
3950 written or not over-optimistic. The pngstest changes are insufficient to
3951 allow all possible RGB transforms to be passed; pngstest cmppixel needs
3952 to be rewritten to make it clearer which errors it allows and then changed
3953 to permit known inaccuracies.
3954 Removed tests for no-longer-used *_EMPTY_PLTE_SUPPORTED from pngstruct.h
3955 Fixed fixed/float API export conditionals. 1) If FIXED_POINT or
3956 FLOATING_POINT options were switched off, png.h ended up with lone ';'
3957 characters. This is not valid ANSI-C outside a function. The ';'
3958 characters have been moved inside the definition of PNG_FP_EXPORT and
3959 PNG_FIXED_EXPORT. 2) If either option was switched off, the declaration
3960 of the corresponding functions were completely omitted, even though some
3961 of them are still used internally. The result is still valid, but
3962 produces warnings from gcc with some warning options (including -Wall). The
3963 fix is to cause png.h to declare the functions with PNG_INTERNAL_FUNCTION
3964 when png.h is included from pngpriv.h.
3965 Check for invalid palette index while reading paletted PNG. When one is
3966 found, issue a warning and increase png_ptr->num_palette accordingly.
3967 Apps are responsible for checking to see if that happened.
3968
3969Version 1.6.0beta12 [February 18, 2012]
3970 Do not increase num_palette on invalid_index.
3971 Relocated check for invalid palette index to pngrtran.c, after unpacking
3972 the sub-8-bit pixels.
3973 Fixed CVE-2011-3026 buffer overrun bug. This bug was introduced when
3974 iCCP chunk support was added at libpng-1.0.6. Deal more correctly with the
3975 test on iCCP chunk length. Also removed spurious casts that may hide
3976 problems on 16-bit systems.
3977
3978Version 1.6.0beta13 [February 24, 2012]
3979 Eliminated redundant png_push_read_tEXt|zTXt|iTXt|unknown code from
3980 pngpread.c and use the sequential png_handle_tEXt, etc., in pngrutil.c;
3981 now that png_ptr->buffer is inaccessible to applications, the special
3982 handling is no longer useful.
3983 Added PNG_SAFE_LIMITS feature to pnglibconf.dfa, pngpriv.h, and new
3984 pngusr.dfa to reset the user limits to safe ones if PNG_SAFE_LIMITS is
3985 defined. To enable, use "CPPFLAGS=-DPNG_SAFE_LIMITS_SUPPORTED=1" on the
3986 configure command or put #define PNG_SAFE_LIMITS_SUPPORTED in
3987 pnglibconf.h.prebuilt and pnglibconf.h.
3988
3989Version 1.6.0beta14 [February 27, 2012]
3990 Added information about the new limits in the manual.
3991 Updated Makefile.in
3992
3993Version 1.6.0beta15 [March 2, 2012]
3994 Removed unused "current_text" members of png_struct and the png_free()
3995 of png_ptr->current_text from pngread.c
3996 Rewrote pngstest.c for substantial speed improvement.
3997 Fixed transparent pixel and 16-bit rgb tests in pngstest and removed a
3998 spurious check in pngwrite.c
3999 Added PNG_IMAGE_FLAG_FAST for the benefit of applications that store
4000 intermediate files, or intermediate in-memory data, while processing
4001 image data with the simplified API. The option makes the files larger
4002 but faster to write and read. pngstest now uses this by default; this
4003 can be disabled with the --slow option.
4004 Improved pngstest fine tuning of error numbers, new test file generator.
4005 The generator generates images that test the full range of sample values,
4006 allow the error numbers in pngstest to be tuned and checked. makepng
4007 also allows generation of images with extra chunks, although this is
4008 still work-in-progress.
4009 Added check for invalid palette index while reading.
4010 Fixed some bugs in ICC profile writing. The code should now accept
4011 all potentially valid ICC profiles and reject obviously invalid ones.
4012 It now uses png_error() to do so rather than casually writing a PNG
4013 without the necessary color data.
4014 Removed whitespace from the end of lines in all source files and scripts.
4015
4016Version 1.6.0beta16 [March 6, 2012]
4017 Relocated palette-index checking function from pngrutil.c to pngtrans.c
4018 Added palette-index checking while writing.
4019 Changed png_inflate() and calling routines to avoid overflow problems.
4020 This is an intermediate check-in that solves the immediate problems and
4021 introduces one performance improvement (avoiding a copy via png_ptr->zbuf.)
4022 Further changes will be made to make ICC profile handling more secure.
4023 Fixed build warnings (MSVC, GCC, GCC v3). Cygwin GCC with default options
4024 declares 'index' as a global, causing a warning if it is used as a local
4025 variable. GCC 64-bit warns about assigning a (size_t) (unsigned 64-bit)
4026 to an (int) (signed 32-bit). MSVC, however, warns about using the
4027 unary '-' operator on an unsigned value (even though it is well defined
4028 by ANSI-C to be ~x+1). The padding calculation was changed to use a
4029 different method. Removed the tests on png_ptr->pass.
4030 Added contrib/libtests/tarith.c to test internal arithmetic functions from
4031 png.c. This is a libpng maintainer program used to validate changes to the
4032 internal arithmetic functions.
4033 Made read 'inflate' handling like write 'deflate' handling. The read
4034 code now claims and releases png_ptr->zstream, like the write code.
4035 The bug whereby the progressive reader failed to release the zstream
4036 is now fixed, all initialization is delayed, and the code checks for
4037 changed parameters on deflate rather than always calling
4038 deflatedEnd/deflateInit.
4039 Validate the zTXt strings in pngvalid.
4040 Added code to validate the windowBits value passed to deflateInit2().
4041 If the call to deflateInit2() is wrong a png_warning will be issued
4042 (in fact this is harmless, but the PNG data produced may be sub-optimal).
4043
4044Version 1.6.0beta17 [March 10, 2012]
4045 Fixed PNG_LIBPNG_BUILD_BASE_TYPE definition.
4046 Reject all iCCP chunks after the first, even if the first one is invalid.
4047 Deflate/inflate was reworked to move common zlib calls into single
4048 functions [rw]util.c. A new shared keyword check routine was also added
4049 and the 'zbuf' is no longer allocated on progressive read. It is now
4050 possible to call png_inflate() incrementally. A warning is no longer
4051 issued if the language tag or translated keyword in the iTXt chunk
4052 has zero length.
4053 If benign errors are disabled use maximum window on ancilliary inflate.
4054 This works round a bug introduced in 1.5.4 where compressed ancillary
4055 chunks could end up with a too-small windowBits value in the deflate
4056 header.
4057
4058Version 1.6.0beta18 [March 16, 2012]
4059 Issue a png_benign_error() instead of png_warning() about bad palette index.
4060 In pngtest, treat benign errors as errors if "-strict" is present.
4061 Fixed an off-by-one error in the palette index checking function.
4062 Fixed a compiler warning under Cygwin (Windows-7, 32-bit system)
4063 Revised example.c to put text strings in a temporary character array
4064 instead of directly assigning string constants to png_textp members.
4065 This avoids compiler warnings when -Wwrite-strings is enabled.
4066 Added output flushing to aid debugging under Visual Studio. Unfortunately
4067 this is necessary because the VS2010 output window otherwise simply loses
4068 the error messages on error (they weren't flushed to the window before
4069 the process exited, apparently!)
4070 Added configuration support for benign errors and changed the read
4071 default. Also changed some warnings in the iCCP and sRGB handling
4072 from to benign errors. Configuration now makes read benign
4073 errors warnings and write benign errors to errors by default (thus
4074 changing the behavior on read). The simplified API always forces
4075 read benign errors to warnings (regardless of the system default, unless
4076 this is disabled in which case the simplified API can't be built.)
4077
4078Version 1.6.0beta19 [March 18, 2012]
4079 Work around for duplicate row start calls; added warning messages.
4080 This turns on PNG_FLAG_DETECT_UNINITIALIZED to detect app code that
4081 fails to call one of the 'start' routines (not enabled in libpng-1.5
4082 because it is technically an API change, since it did normally work
4083 before.) It also makes duplicate calls to png_read_start_row (an
4084 internal function called at the start of the image read) benign, as
4085 they were before changes to use png_inflate_claim. Somehow webkit is
4086 causing this to happen; this is probably a mis-feature in the zlib
4087 changes so this commit is only a work-round.
4088 Removed erroneous setting of DETECT_UNINITIALIZED and added more
4089 checks. The code now does a png_error if an attempt is made to do the
4090 row initialization twice; this is an application error and it has
4091 serious consequences because the transform data in png_struct is
4092 changed by each call.
4093 Added application error reporting and added chunk names to read
4094 benign errors; also added --strict to pngstest - not enabled
4095 yet because a warning is produced.
4096 Avoid the double gamma correction warning in the simplified API.
4097 This allows the --strict option to pass in the pngstest checks
4098
4099Version 1.6.0beta20 [March 29, 2012]
4100 Changed chunk handler warnings into benign errors, incrementally load iCCP
4101 Added checksum-icc.c to contrib/tools
4102 Prevent PNG_EXPAND+PNG_SHIFT doing the shift twice.
4103 Recognize known sRGB ICC profiles while reading; prefer writing the
4104 iCCP profile over writing the sRGB chunk, controlled by the
4105 PNG_sRGB_PROFILE_CHECKS option.
4106 Revised png_set_text_2() to avoid potential memory corruption (fixes
4107 CVE-2011-3048, also known as CVE-2012-3425).
4108
4109Version 1.6.0beta21 [April 27, 2012]
4110 Revised scripts/makefile.darwin: use system zlib; remove quotes around
4111 architecture list; add missing ppc architecture; add architecture options
4112 to shared library link; don't try to create a shared lib based on missing
4113 RELEASE variable.
4114 Enable png_set_check_for_invalid_index() for both read and write.
4115 Removed #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED in pngpriv.h around
4116 declaration of png_handle_unknown().
4117 Added -lssp_nonshared in a comment in scripts/makefile.freebsd
4118 and changed deprecated NOOBJ and NOPROFILE to NO_OBJ and NO_PROFILE.
4119
4120Version 1.6.0beta22 [May 23, 2012]
4121 Removed need for -Wno-cast-align with clang. clang correctly warns on
4122 alignment increasing pointer casts when -Wcast-align is passed. This
4123 fixes the cases that clang warns about either by eliminating the
4124 casts from png_bytep to png_uint_16p (pngread.c), or, for pngrutil.c
4125 where the cast is previously verified or pngstest.c where it is OK, by
4126 introducing new png_aligncast macros to do the cast in a way that clang
4127 accepts.
4128
4129Version 1.6.0beta23 [June 6, 2012]
4130 Revised CMakeLists.txt to not attempt to make a symlink under mingw.
4131 Made fixes for new optimization warnings from gcc 4.7.0. The compiler
4132 performs an optimization which is safe; however it then warns about it.
4133 Changing the type of 'palette_number' in pngvalid.c removes the warning.
4134 Do not depend upon a GCC feature macro being available for use in generating
4135 the linker mapfile symbol prefix.
4136 Improved performance of new do_check_palette_indexes() function (only
4137 update the value when it actually increases, move test for whether
4138 the check is wanted out of the function.
4139
4140Version 1.6.0beta24 [June 7, 2012]
4141 Don't check palette indexes if num_palette is 0 (as it can be in MNG files).
4142
4143Version 1.6.0beta25 [June 16, 2012]
4144 Revised png_set_keep_unknown_chunks() so num_chunks < 0 means ignore all
4145 unknown chunks and all known chunks except for IHDR, PLTE, tRNS, IDAT,
4146 and IEND. Previously it only meant ignore all unknown chunks, the
4147 same as num_chunks == 0. Revised png_image_skip_unused_chunks() to
4148 provide a list of chunks to be processed instead of a list of chunks to
4149 ignore. Revised contrib/gregbook/readpng2.c accordingly.
4150
4151Version 1.6.0beta26 [July 10, 2012]
4152 Removed scripts/makefile.cegcc from the *.zip and *.7z distributions; it
4153 depends on configure, which is not included in those archives.
4154 Moved scripts/chkfmt to contrib/tools.
4155 Changed "a+w" to "u+w" in Makefile.in to fix CVE-2012-3386.
4156
4157Version 1.6.0beta27 [August 11, 2012]
4158 Do not compile PNG_DEPRECATED, PNG_ALLOC and PNG_PRIVATE when __GNUC__ < 3.
4159 Do not use __restrict when GNUC is <= 3.1
4160 Removed references to png_zalloc() and png_zfree() from the manual.
4161 Fixed configurations where floating point is completely disabled. Because
4162 of the changes to support symbol prefixing PNG_INTERNAL_FUNCTION declares
4163 floating point APIs during libpng builds even if they are completely
4164 disabled. This requires the png floating point types (png_double*) to be
4165 declared even though the functions are never actually defined. This
4166 change provides a dummy definition so that the declarations work, yet any
4167 implementation will fail to compile because of an incomplete type.
4168 Re-eliminated the use of strcpy() in pngtest.c. An unncessary use of
4169 strcpy() was accidentally re-introduced in libpng16; this change replaces
4170 it with strncpy().
4171 Eliminated use of png_sizeof(); use sizeof() instead.
4172 Use a consistent style for (sizeof type) and (sizeof (array))
4173 Cleanup of png_set_filler(). This function does very different things on
4174 read and write. In libpng 1.6 the two cases can be distinguished and
4175 considerable code cleanup, and extra error checking, is possible. This
4176 makes calls on the write side that have no effect be ignored with a
4177 png_app_error(), which can be disabled in the app using
4178 png_set_benign_errors(), and removes the spurious use of usr_channels
4179 on the read side.
4180 Insist on autotools 1.12.1 for git builds because there are security issues
4181 with 1.12 and insisting on anything less would allow 1.12 to be used.
4182 Removed info_ptr->signature[8] from WRITE-only builds.
4183 Add some conditions for compiling png_fixed(). This is a small function
4184 but it requires "-lm" on some platforms.
4185 Cause pngtest --strict to fail on any warning from libpng (not just errors)
4186 and cause it not to fail at the comparison step if libpng lacks support
4187 for writing chunks that it reads from the input (currently only implemented
4188 for compressed text chunks).
4189 Make all three "make check" test programs work without READ or WRITE support.
4190 Now "make check" will succeed even if libpng is compiled with -DPNG_NO_READ
4191 or -DPNG_NO_WRITE. The tests performed are reduced, but the basic reading
4192 and writing of a PNG file is always tested by one or more of the tests.
4193 Consistently use strlen(), memset(), memcpy(), and memcmp() instead of the
4194 png_strlen(), png_memset(), png_memcpy(), and png_memcmp() macros.
4195 Removed the png_sizeof(), png_strlen(), png_memset(), png_memcpy(), and
4196 png_memcmp() macros.
4197 Work around gcc 3.x and Microsoft Visual Studio 2010 complaints. Both object
4198 to the split initialization of num_chunks.
4199
4200Version 1.6.0beta28 [August 29, 2012]
4201 Unknown handling fixes and clean up. This adds more correct option
4202 control of the unknown handling, corrects the pre-existing bug where
4203 the per-chunk 'keep' setting is ignored and makes it possible to skip
4204 IDAT chunks in the sequential reader (broken in earlier 1.6 versions).
4205 There is a new test program, test-unknown.c, which is a work in progress
4206 (not currently part of the test suite). Comments in the header files now
4207 explain how the unknown handling works.
4208 Allow fine grain control of unknown chunk APIs. This change allows
4209 png_set_keep_unknown_chunks() to be turned off if not required and causes
4210 both read and write to behave appropriately (on read this is only possible
4211 if the user callback is used to handle unknown chunks). The change
4212 also removes the support for storing unknown chunks in the info_struct
4213 if the only unknown handling enabled is via the callback, allowing libpng
4214 to be configured with callback reading and none of the unnecessary code.
4215 Corrected fix for unknown handling in pngtest. This reinstates the
4216 libpng handling of unknown chunks other than vpAg and sTER (including
4217 unsafe-to-copy chunks which were dropped before) and eliminates the
4218 repositioning of vpAg and sTER in pngtest.png by changing pngtest.png
4219 (so the chunks are where libpng would put them).
4220 Added "tunknown" test and corrected a logic error in png_handle_unknown()
4221 when SAVE support is absent. Moved the shell test scripts for
4222 contrib/libtests from the libpng top directory to contrib/libtests.
4223 png_handle_unknown() must always read or skip the chunk, if
4224 SAVE_UNKNOWN_CHUNKS is turned off *and* the application does not set
4225 a user callback an unknown chunk will not be read, leading to a read
4226 error, which was revealed by the "tunknown" test.
4227 Cleaned up and corrected ICC profile handling.
4228 contrib/libtests/makepng: corrected 'rgb' and 'gray' cases. profile_error
4229 messages could be truncated; made a correct buffer size calculation and
4230 adjusted pngerror.c appropriately. png_icc_check_* checking improved;
4231 changed the functions to receive the correct color type of the PNG on read
4232 or write and check that it matches the color space of the profile (despite
4233 what the comments said before, there is danger in assuming the app will
4234 cope correctly with an RGB profile on a grayscale image and, since it
4235 violates the PNG spec, allowing it is certain to produce inconsistent
4236 app behavior and might even cause app crashes.) Check that profiles
4237 contain the tags needed to process the PNG (tags all required by the ICC
4238 spec). Removed unused PNG_STATIC from pngpriv.h.
4239
4240Version 1.6.0beta29 [September 4, 2012]
4241 Fixed the simplified API example programs to add the *colormap parameter
4242 to several of he API and improved the error message if the version field
4243 is not set.
4244 Added contrib/examples/* to the *.zip and *.7z distributions.
4245 Updated simplified API synopses and description of the png_image structure
4246 in the manual.
4247 Made makepng and pngtest produce identical PNGs, add "--relaxed" option
4248 to pngtest. The "--relaxed" option turns off the benign errors that are
4249 enabled by default in pre-RC builds. makepng can now write ICC profiles
4250 where the length has not been extended to a multiple of 4, and pngtest
4251 now intercepts all libpng errors, allowing the previously-introduced
4252 "--strict test" on no warnings to actually work.
4253 Improved ICC profile handling including cHRM chunk generation and fixed
4254 Cygwin+MSVC build errors. The ICC profile handling now includes more
4255 checking. Several errors that caused rejection of the profile are now
4256 handled with a warning in such a way that the invalid profiles will be
4257 read by default in release (but not pre-RC) builds but will not be
4258 written by default. The easy part of handling the cHRM chunk is written,
4259 where the ICC profile contains the required data. The more difficult
4260 part plus guessing a gAMA value requires code to pass selected RGB values
4261 through the profile.
4262
4263Version 1.6.0beta30 [October 24, 2012]
4264 Changed ICC profile matrix/vector types to not depend on array type rules.
4265 By the ANSI-C standard the new types should be identical to the previous
4266 versions, and all known versions of gcc tested with the previous versions
4267 except for GCC-4.2.1 work with this version. The change makes the ANSI-C
4268 rule that const applied to an array of elements applies instead to the
4269 elements in the array moot by explicitly applying const to the base
4270 elements of the png_icc_matrix and png_icc_vector types. The accidental
4271 (harmless) 'const' previously applied to the parameters of two of the
4272 functions have also been removed.
4273 Added a work around for GCC 4.2 optimization bug.
4274 Marked the broken (bad white point) original HP sRGB profiles correctly and
4275 correct comments.
4276 Added -DZ_SOLO to contrib/pngminim/*/makefile to work with zlib-1.2.7
4277 Use /MDd for vstudio debug builds. Also added pngunkown to the vstudio
4278 builds, fixed build errors and corrected a minor exit code error in
4279 pngvalid if the 'touch' file name is invalid.
4280 Add updated WARNING file to projects/vstudio from libpng 1.5/vstudio
4281 Fixed build when using #define PNG_NO_READ_GAMMA in png_do_compose() in
4282 pngrtran.c (Domani Hannes).
4283
4284Version 1.6.0beta31 [November 1, 2012]
4285 Undid the erroneous change to vstudio/pngvalid build in libpng-1.6.0beta30.
4286 Made pngvalid so that it will build outside the libpng source tree.
4287 Made builds -DPNG_NO_READ_GAMMA compile (the unit tests still fail).
4288 Made PNG_NO_READ_GAMMA switch off interfaces that depend on READ_GAMMA.
4289 Prior to 1.6.0 switching off READ_GAMMA did unpredictable things to the
4290 interfaces that use it (specifically, png_do_background in 1.4 would
4291 simply display composite for grayscale images but do composition
4292 with the incorrect arithmetic for color ones). In 1.6 the semantic
4293 of -DPNG_NO_READ_GAMMA is changed to simply disable any interface that
4294 depends on it; this obliges people who set it to consider whether they
4295 really want it off if they happen to use any of the interfaces in
4296 question (typically most users who disable it won't).
4297 Fixed GUIDs in projects/vstudio. Some were duplicated or missing,
4298 resulting in VS2010 having to update the files.
4299 Removed non-working ICC profile support code that was mostly added to
4300 libpng-1.6.0beta29 and beta30. There was too much code for too little
4301 gain; implementing full ICC color correction may be desireable but is left
4302 up to applications.
4303
4304Version 1.6.0beta32 [November 25, 2012]
4305 Fixed an intermittent SEGV in pngstest due to an uninitialized array element.
4306 Added the ability for contrib/libtests/makepng.c to make a PNG with just one
4307 color. This is useful for debugging pngstest color inaccuracy reports.
4308 Fixed error checking in the simplified write API (Olaf van der Spek)
4309 Made png_user_version_check() ok to use with libpng version 1.10.x and later.
4310
4311Version 1.6.0beta33 [December 15, 2012]
4312 Fixed typo in png.c (PNG_SET_CHUNK_MALLOC_MAX should be PNG_CHUNK_MALLOC_MAX)
4313 that causes the MALLOC_MAX limit not to work (John Bowler)
4314 Change png_warning() to png_app_error() in pngwrite.c and comment the
4315 fall-through condition.
4316 Change png_warning() to png_app_warning() in png_write_tRNS().
4317 Rearranged the ARM-NEON optimizations: Isolated the machine specific code
4318 to the hardware subdirectory and added comments to pngrutil.c so that
4319 implementors of other optimizations know what to do.
4320 Fixed cases of unquoted DESTDIR in Makefile.am
4321 Rebuilt Makefile.in, etc., with autoconf-2.69 and automake-1.12.5.
4322
4323Version 1.6.0beta34 [December 19, 2012]
4324 Cleaned up whitespace in the synopsis portion of the manpage "libpng.3"
4325 Disassembled the version number in scripts/options.awk (necessary for
4326 building on SunOs).
4327
4328Version 1.6.0beta35 [December 23, 2012]
4329 Made default Zlib compression settings be configurable. This adds #defines to
4330 pnglibconf.h to control the defaults.
4331 Fixed Windows build issues, enabled ARM compilation. Various warnings issued
4332 by earlier versions of GCC fixed for Cygwin and Min/GW (which both use old
4333 GCCs.) ARM support is enabled by default in zlib.props (unsupported by
4334 Microsoft) and ARM compilation is made possible by deleting the check for
4335 x86. The test programs cannot be run because they are not signed.
4336
4337Version 1.6.0beta36 [January 2, 2013]
4338 Discontinued distributing libpng-1.x.x.tar.bz2.
4339 Discontinued distributing libpng-1.7.0-1.6.0-diff.txt and similar.
4340 Rebuilt configure with autoconf-2.69 (inadvertently not done in beta33)
4341 Fixed 'make distcheck' on SUN OS - libpng.so was not being removed
4342
4343Version 1.6.0beta37 [January 10, 2013]
4344 Fixed conceivable but difficult to repro overflow. Also added two test
4345 programs to generate and test a PNG which should have the problem.
4346
4347Version 1.6.0beta39 [January 19, 2013]
4348 Again corrected attempt at overflow detection in png_set_unknown_chunks()
4349 (CVE-2013-7353). Added overflow detection in png_set_sPLT() and
4350 png_set_text_2() (CVE-2013-7354).
4351
4352Version 1.6.0beta40 [January 20, 2013]
4353 Use consistent handling of overflows in text, sPLT and unknown png_set_* APIs
4354
4355Version 1.6.0rc01 [January 26, 2013]
4356 No changes.
4357
4358Version 1.6.0rc02 [February 4, 2013]
4359 Added png_get_palette_max() function.
4360
4361Version 1.6.0rc03 [February 5, 2013]
4362 Fixed the png_get_palette_max API.
4363
4364Version 1.6.0rc04 [February 7, 2013]
4365 Turn serial tests back on (recently turned off by autotools upgrade).
4366
4367Version 1.6.0rc05 [February 8, 2013]
4368 Update manual about png_get_palette_max().
4369
4370Version 1.6.0rc06 [February 9, 2013]
4371 Fixed missing dependency in --prefix builds The intermediate
4372 internal 'prefix.h' file can only be generated correctly after
4373 pnglibconf.h, however the dependency was not in Makefile.am. The
4374 symptoms are unpredictable depending on the order make chooses to
4375 build pngprefix.h and pnglibconf.h, often the error goes unnoticed
4376 because there is a system pnglibconf.h to use instead.
4377
4378Version 1.6.0rc07 [February 10, 2013]
4379 Enclosed the new png_get_palette_max in #ifdef PNG_GET_PALETTE_MAX_SUPPORTED
4380 block, and revised pnglibconf.h and pnglibconf.h.prebuilt accordingly.
4381
4382Version 1.6.0rc08 [February 10, 2013]
4383 Fix typo in png.h #ifdef
4384
4385Version 1.6.0 [February 14, 2013]
4386 No changes.
4387
4388Version 1.6.1beta01 [February 16, 2013]
4389 Made symbol prefixing work with the ARM neon optimizations. Also allow
4390 pngpriv.h to be included for preprocessor definitions only, so it can
4391 be used in non-C/C++ files. Back ported from libpng 1.7.
4392 Made sRGB check numbers consistent.
4393 Ported libpng 1.5 options.awk/dfn file handling to 1.6, fixed one bug.
4394 Removed cc -E workround, corrected png_get_palette_max API Tested on
4395 SUN OS cc 5.9, which demonstrates the tokenization problem previously
4396 avoided by using /lib/cpp. Since all .dfn output is now protected in
4397 double quotes unless it is to be macro substituted the fix should
4398 work everywhere.
4399 Enabled parallel tests - back ported from libpng-1.7.
4400 scripts/pnglibconf.dfa formatting improvements back ported from libpng17.
4401 Fixed a race condition in the creation of the build 'scripts' directory
4402 while building with a parallel make.
4403 Use approved/supported Android method to check for NEON, use Linux/POSIX
4404 1003.1 API to check /proc/self/auxv avoiding buffer allocation and other
4405 library calls (ported from libpng15).
4406
4407Version 1.6.1beta02 [February 19, 2013]
4408 Use parentheses more consistently in "#if defined(MACRO)" tests.
4409 Folded long lines.
4410 Reenabled code to allow zero length PLTE chunks for MNG.
4411
4412Version 1.6.1beta03 [February 22, 2013]
4413 Fixed ALIGNED_MEMORY support.
4414 Allow run-time ARM NEON checking to be disabled. A new configure option:
4415 --enable-arm-neon=always will stop the run-time checks. New checks
4416 within arm/arm_init.c will cause the code not to be compiled unless
4417 __ARM_NEON__ is set. This should make it fail safe (if someone asks
4418 for it on then the build will fail if it can't be done.)
4419 Updated the INSTALL document.
4420
4421Version 1.6.1beta04 [February 27, 2013]
4422 Revised INSTALL to recommend using CPPFLAGS instead of INCLUDES.
4423 Revised scripts/makefile.freebsd to respect ZLIBLIB and ZLIBINC.
4424 Revised scripts/dfn.awk to work with the buggy MSYS awk that has trouble
4425 with CRLF line endings.
4426
4427Version 1.6.1beta05 [March 1, 2013]
4428 Avoid a possible memory leak in contrib/gregbook/readpng.c
4429
4430Version 1.6.1beta06 [March 4, 2013]
4431 Better documentation of unknown handling API interactions.
4432 Corrected Android builds and corrected libpng.vers with symbol
4433 prefixing. This adds an API to set optimization options externally,
4434 providing an alternative and general solution for the non-portable
4435 run-time tests used by the ARM Neon code. It also makes those tests
4436 compile and link on Android.
4437 The order of settings vs options in pnglibconf.h is reversed to allow
4438 settings to depend on options and options can now set (or override) the
4439 defaults for settings.
4440
4441Version 1.6.1beta07 [March 7, 2013]
4442 Corrected simplified API default gamma for color-mapped output, added
4443 a flag to change default. In 1.6.0 when the simplified API was used
4444 to produce color-mapped output from an input image with no gamma
4445 information the gamma assumed for the input could be different from
4446 that assumed for non-color-mapped output. In particular 16-bit depth
4447 input files were assumed to be sRGB encoded, whereas in the 'direct'
4448 case they were assumed to have linear data. This was an error. The
4449 fix makes the simplified API treat all input files the same way and
4450 adds a new flag to the png_image::flags member to allow the
4451 application/user to specify that 16-bit files contain sRGB data
4452 rather than the default linear.
4453 Fixed bugs in the pngpixel and makepng test programs.
4454
4455Version 1.6.1beta08 [March 7, 2013]
4456 Fixed CMakelists.txt to allow building a single variant of the library
4457 (Claudio Bley):
4458 Introduced a PNG_LIB_TARGETS variable that lists all activated library
4459 targets. It is an error if this variable ends up empty, ie. you have
4460 to build at least one library variant.
4461 Made the *_COPY targets only depend on library targets actually being build.
4462 Use PNG_LIB_TARGETS to unify a code path.
4463 Changed the CREATE_SYMLINK macro to expect the full path to a file as the
4464 first argument. When symlinking the filename component of that path is
4465 determined and used as the link target.
4466 Use copy_if_different in the CREATE_SYMLINK macro.
4467
4468Version 1.6.1beta09 [March 13, 2013]
4469 Eliminated two warnings from the Intel C compiler. The warnings are
4470 technically valid, although a reasonable treatment of division would
4471 show it to be incorrect.
4472
4473Version 1.6.1rc01 [March 21, 2013]
4474 No changes.
4475
4476Version 1.6.1 [March 28, 2013]
4477 No changes.
4478
4479Version 1.6.2beta01 [April 14, 2013]
4480 Updated documentation of 1.5.x to 1.6.x changes in iCCP chunk handling.
4481 Fixed incorrect warning of excess deflate data. End condition - the
4482 warning would be produced if the end of the deflate stream wasn't read
4483 in the last row. The warning is harmless.
4484 Corrected the test on user transform changes on read. It was in the
4485 png_set of the transform function, but that doesn't matter unless the
4486 transform function changes the rowbuf size, and that is only valid if
4487 transform_info is called.
4488 Corrected a misplaced closing bracket in contrib/libtests/pngvalid.c
4489 (Flavio Medeiros).
4490 Corrected length written to uncompressed iTXt chunks (Samuli Suominen).
4491 Bug was introduced in libpng-1.6.0.
4492
4493Version 1.6.2rc01 [April 18, 2013]
4494 Added contrib/tools/fixitxt.c, to repair the erroneous iTXt chunk length
4495 written by libpng-1.6.0 and 1.6.1.
4496 Disallow storing sRGB information when the sRGB is not supported.
4497
4498Version 1.6.2rc02 [April 18, 2013]
4499 Merge pngtest.c with libpng-1.7.0
4500
4501Version 1.6.2rc03 [April 22, 2013]
4502 Trivial spelling cleanup.
4503
4504Version 1.6.2rc04 and 1.6.2rc05 [omitted]
4505
4506Version 1.6.2rc06 [April 24, 2013]
4507 Reverted to version 1.6.2rc03. Recent changes to arm/neon support
4508 have been ported to libpng-1.7.0beta09 and will reappear in version
4509 1.6.3beta01.
4510
4511Version 1.6.2 [April 25, 2013]
4512 No changes.
4513
4514Version 1.6.3beta01 [April 25, 2013]
4515 Revised stack marking in arm/filter_neon.S and configure.ac.
4516 Ensure that NEON filter stuff is completely disabled when switched 'off'.
4517 Previously the ARM NEON specific files were still built if the option
4518 was switched 'off' as opposed to being explicitly disabled.
4519
4520Version 1.6.3beta02 [April 26, 2013]
4521 Test for 'arm*' not just 'arm' in the host_cpu configure variable.
4522 Rebuilt the configure scripts.
4523
4524Version 1.6.3beta03 [April 30, 2013]
4525 Expanded manual paragraph about writing private chunks, particularly
4526 the need to call png_set_keep_unknown_chunks() when writing them.
4527 Avoid dereferencing NULL pointer possibly returned from
4528 png_create_write_struct() (Andrew Church).
4529
4530Version 1.6.3beta05 [May 9, 2013]
4531 Calculate our own zlib windowBits when decoding rather than trusting the
4532 CMF bytes in the PNG datastream.
4533 Added an option to force maximum window size for inflating, which was
4534 the behavior of libpng15 and earlier.
4535 Added png-fix-itxt and png-fix-too-far-back to the built programs and
4536 removed warnings from the source code and timepng that are revealed as
4537 a result.
4538 Detect wrong libpng versions linked to png-fix-too-far-back, which currently
4539 only works with libpng versions that can be made to reliably fail when
4540 the deflate data contains an out-of-window reference. This means only
4541 1.6 and later.
4542 Fixed gnu issues: g++ needs a static_cast, gcc 4.4.7 has a broken warning
4543 message which it is easier to work round than ignore.
4544 Updated contrib/pngminus/pnm2png.c (Paul Stewart):
4545 Check for EOF
4546 Ignore "#" delimited comments in input file to pnm2png.c.
4547 Fixed whitespace handling
4548 Added a call to png_set_packing()
4549 Initialize dimension values so if sscanf fails at least we have known
4550 invalid values.
4551 Attempt to detect configuration issues with png-fix-too-far-back, which
4552 requires both the correct libpng and the correct zlib to function
4553 correctly.
4554 Check ZLIB_VERNUM for mismatches, enclose #error in quotes
4555 Added information in the documentation about problems with and fixes for
4556 the bad CRC and bad iTXt chunk situations.
4557
4558Version 1.6.3beta06 [May 12, 2013]
4559 Allow contrib/pngminus/pnm2png.c to compile without WRITE_INVERT and
4560 WRITE_PACK supported (writes error message that it can't read P1 or
4561 P4 PBM files).
4562 Improved png-fix-too-far-back usage message, added --suffix option.
4563 Revised contrib/pngminim/*/makefile to generate pnglibconf.h with the
4564 right zlib header files.
4565 Separated CPPFLAGS and CFLAGS in contrib/pngminim/*/makefile
4566
4567Version 1.6.3beta07 [June 8, 2013]
4568 Removed a redundant test in png_set_IHDR().
4569 Added set(CMAKE_CONFIGURATION_TYPES ...) to CMakeLists.txt (Andrew Hundt)
4570 Deleted set(CMAKE_BUILD_TYPE) block from CMakeLists.txt
4571 Enclose the prototypes for the simplified write API in
4572 #ifdef PNG_STDIO_SUPPORTED/#endif
4573 Make ARM NEON support work at compile time (not just configure time).
4574 This moves the test on __ARM_NEON__ into pngconf.h to avoid issues when
4575 using a compiler that compiles for multiple architectures at one time.
4576 Removed PNG_FILTER_OPTIMIZATIONS and PNG_ARM_NEON_SUPPORTED from
4577 pnglibconf.h, allowing more of the decisions to be made internally
4578 (pngpriv.h) during the compile. Without this, symbol prefixing is broken
4579 under certain circumstances on ARM platforms. Now only the API parts of
4580 the optimizations ('check' vs 'api') are exposed in the public header files
4581 except that the new setting PNG_ARM_NEON_OPT documents how libpng makes the
4582 decision about whether or not to use the optimizations.
4583 Protect symbol prefixing against CC/CPPFLAGS/CFLAGS useage.
4584 Previous iOS/Xcode fixes for the ARM NEON optimizations moved the test
4585 on __ARM_NEON__ from configure time to compile time. This breaks symbol
4586 prefixing because the definition of the special png_init_filter_functions
4587 call was hidden at configure time if the relevant compiler arguments are
4588 passed in CFLAGS as opposed to CC. This change attempts to avoid all
4589 the confusion that would result by declaring the init function even when
4590 it is not used, so that it will always get prefixed.
4591
4592Version 1.6.3beta08 [June 18, 2013]
4593 Revised libpng.3 so that "doclifter" can process it.
4594
4595Version 1.6.3beta09 [June 27, 2013]
4596 Revised example.c to illustrate use of PNG_DEFAULT_sRGB and PNG_GAMMA_MAC_18
4597 as parameters for png_set_gamma(). These have been available since
4598 libpng-1.5.4.
4599 Renamed contrib/tools/png-fix-too-far-back.c to pngfix.c and revised it
4600 to check all compressed chunks known to libpng.
4601
4602Version 1.6.3beta10 [July 5, 2013]
4603 Updated documentation to show default behavior of benign errors correctly.
4604 Only compile ARM code when PNG_READ_SUPPORTED is defined.
4605 Fixed undefined behavior in contrib/tools/pngfix.c and added new strip
4606 option. pngfix relied on undefined behavior and even a simple change from
4607 gcc to g++ caused it to fail. The new strip option 'unsafe' has been
4608 implemented and is the default if --max is given. Option names have
4609 been clarified, with --strip=transform now stripping the bKGD chunk,
4610 which was stripped previously with --strip=unused.
4611 Added all documented chunk types to pngpriv.h
4612 Unified pngfix.c source with libpng17.
4613
4614Version 1.6.3rc01 [July 11, 2013]
4615 No changes.
4616
4617Version 1.6.3 [July 18, 2013]
4618 Revised manual about changes in iTXt chunk handling made in libpng-1.6.0.
4619 Added "/* SAFE */" comments in pngrutil.c and pngrtran.c where warnings
4620 may be erroneously issued by code-checking applications.
4621
4622Version 1.6.4beta01 [August 21, 2013]
4623 Added information about png_set_options() to the manual.
4624 Delay calling png_init_filter_functions() until a row with nonzero filter
4625 is found.
4626
4627Version 1.6.4beta02 [August 30, 2013]
4628 Fixed inconsistent conditional compilation of png_chunk_unknown_handling()
4629 prototype, definition, and usage. Made it depend on
4630 PNG_HANDLE_AS_UNKNOWN_SUPPORTED everywhere.
4631
4632Version 1.6.4rc01 [September 5, 2013]
4633 No changes.
4634
4635Version 1.6.4 [September 12, 2013]
4636 No changes.
4637
4638Version 1.6.5 [September 14, 2013]
4639 Removed two stray lines of code from arm/arm_init.c.
4640
4641Version 1.6.6 [September 16, 2013]
4642 Removed two stray lines of code from arm/arm_init.c, again.
4643
4644Version 1.6.7beta01 [September 30, 2013]
4645 Revised unknown chunk code to correct several bugs in the NO_SAVE_/NO_WRITE
4646 combination
4647 Allow HANDLE_AS_UNKNOWN to work when other options are configured off. Also
4648 fixed the pngminim makefiles to work when $(MAKEFLAGS) contains stuff
4649 which terminates the make options (as by default in recent versions of
4650 Gentoo).
4651 Avoid up-cast warnings in pngvalid.c. On ARM the alignment requirements of
4652 png_modifier are greater than that of png_store and as a consequence
4653 compilation of pngvalid.c results in a warning about increased alignment
4654 requirements because of the bare cast to (png_modifier*). The code is safe,
4655 because the pointer is known to point to a stack allocated png_modifier,
4656 but this change avoids the warning.
4657 Fixed default behavior of ARM_NEON_API. If the ARM NEON API option was
4658 compiled without the CHECK option it defaulted to on, not off.
4659 Check user callback behavior in pngunknown.c. Previous versions compiled
4660 if SAVE_UNKNOWN was not available but did nothing since the callback
4661 was never implemented.
4662 Merged pngunknown.c with 1.7 version and back ported 1.7 improvements/fixes
4663
4664Version 1.6.7beta02 [October 12, 2013]
4665 Made changes for compatibility with automake 1.14:
4666 1) Added the 'compile' program to the list of programs that must be cleaned
4667 in autogen.sh
4668 2) Added 'subdir-objects' which causes .c files in sub-directories to be
4669 compiled such that the corresponding .o files are also in the
4670 sub-directory. This is because automake 1.14 warns that the
4671 current behavior of compiling to the top level directory may be removed
4672 in the future.
4673 3) Updated dependencies on pnglibconf.h to match the new .o locations and
4674 added all the files in contrib/libtests and contrib/tools that depend
4675 on pnglibconf.h
4676 4) Added 'BUILD_SOURCES = pnglibconf.h'; this is the automake recommended
4677 way of handling the dependencies of sources that are machine generated;
4678 unfortunately it only works if the user does 'make all' or 'make check',
4679 so the dependencies (3) are still required.
4680 Cleaned up (char*) casts of zlib messages. The latest version of the Intel C
4681 compiler complains about casting a string literal as (char*), so copied the
4682 treatment of z_const from the library code into pngfix.c
4683 Simplified error message code in pngunknown. The simplification has the
4684 useful side effect of avoiding a bogus warning generated by the latest
4685 version of the Intel C compiler (it objects to
4686 condition ? string-literal : string-literal).
4687 Make autogen.sh work with automake 1.13 as well as 1.14. Do this by always
4688 removing the 1.14 'compile' script but never checking for it.
4689
4690Version 1.6.7beta03 [October 19, 2013]
4691 Added ARMv8 support (James Yu <james.yu at linaro.org>). Added file
4692 arm/filter_neon_intrinsics.c; enable with -mfpu=neon.
4693 Revised pngvalid to generate size images with as many filters as it can
4694 manage, limited by the number of rows.
4695 Cleaned up ARM NEON compilation handling. The tests are now in pngpriv.h
4696 and detect the broken GCC compilers.
4697
4698Version 1.6.7beta04 [October 26, 2013]
4699 Allow clang derived from older GCC versions to use ARM intrinsics. This
4700 causes all clang builds that use -mfpu=neon to use the intrinsics code,
4701 not the assembler code. This has only been tested on iOS 7. It may be
4702 necessary to exclude some earlier clang versions but this seems unlikely.
4703 Changed NEON implementation selection mechanism. This allows assembler
4704 or intrinsics to be turned on at compile time during the build by defining
4705 PNG_ARM_NEON_IMPLEMENTATION to the correct value (2 or 1). This macro
4706 is undefined by default and the build type is selected in pngpriv.h.
4707
4708Version 1.6.7rc01 [November 2, 2013]
4709 No changes.
4710
4711Version 1.6.7rc02 [November 7, 2013]
4712 Fixed #include in filter_neon_intrinsics.c and ctype macros. The ctype char
4713 checking macros take an unsigned char argument, not a signed char.
4714
4715Version 1.6.7 [November 14, 2013]
4716 No changes.
4717
4718Version 1.6.8beta01 [November 24, 2013]
4719 Moved prototype for png_handle_unknown() in pngpriv.h outside of
4720 the #ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED/#endif block.
4721 Added "-Wall" to CFLAGS in contrib/pngminim/*/makefile
4722 Conditionally compile some unused functions reported by -Wall in
4723 pngminim.
4724 Fixed 'minimal' builds. Various obviously useful minimal configurations
4725 don't build because of missing contrib/libtests test programs and
4726 overly complex dependencies in scripts/pnglibconf.dfa. This change
4727 adds contrib/conftest/*.dfa files that can be used in automatic build
4728 scripts to ensure that these configurations continue to build.
4729 Enabled WRITE_INVERT and WRITE_PACK in contrib/pngminim/encoder.
4730 Fixed pngvalid 'fail' function declaration on the Intel C Compiler.
4731 This reverts to the previous 'static' implementation and works round
4732 the 'unused static function' warning by using PNG_UNUSED().
4733
4734Version 1.6.8beta02 [November 30, 2013]
4735 Removed or marked PNG_UNUSED some harmless "dead assignments" reported
4736 by clang scan-build.
4737 Changed tabs to 3 spaces in png_debug macros and changed '"%s"m'
4738 to '"%s" m' to improve portability among compilers.
4739 Changed png_free_default() to free() in pngtest.c
4740
4741Version 1.6.8rc01 [December 12, 2013]
4742 Tidied up pngfix inits and fixed pngtest no-write builds.
4743
4744Version 1.6.8rc02 [December 14, 2013]
4745 Handle zero-length PLTE chunk or NULL palette with png_error()
4746 instead of png_chunk_report(), which by default issues a warning
4747 rather than an error, leading to later reading from a NULL pointer
4748 (png_ptr->palette) in png_do_expand_palette(). This is CVE-2013-6954
4749 and VU#650142. Libpng-1.6.1 through 1.6.7 are vulnerable.
4750 Libpng-1.6.0 and earlier do not have this bug.
4751
4752Version 1.6.8 [December 19, 2013]
4753 No changes.
4754
4755Version 1.6.9beta01 [December 26, 2013]
4756 Bookkeeping: Moved functions around (no changes). Moved transform
4757 function definitions before the place where they are called so that
4758 they can be made static. Move the intrapixel functions and the
4759 grayscale palette builder out of the png?tran.c files. The latter
4760 isn't a transform function and is no longer used internally, and the
4761 former MNG specific functions are better placed in pngread/pngwrite.c
4762 Made transform implementation functions static. This makes the internal
4763 functions called by png_do_{read|write}_transformations static. On an
4764 x86-64 DLL build (Gentoo Linux) this reduces the size of the text
4765 segment of the DLL by 1208 bytes, about 0.6%. It also simplifies
4766 maintenance by removing the declarations from pngpriv.h and allowing
4767 easier changes to the internal interfaces.
4768 Rebuilt configure scripts with automake-1.14.1 and autoconf-2.69
4769 in the tar distributions.
4770
4771Version 1.6.9beta02 [January 1, 2014]
4772 Added checks for libpng 1.5 to pngvalid.c. This supports the use of
4773 this version of pngvalid in libpng 1.5
4774 Merged with pngvalid.c from libpng-1.7 changes to create a single
4775 pngvalid.c
4776 Removed #error macro from contrib/tools/pngfix.c (Thomas Klausner).
4777 Merged pngrio.c, pngtrans.c, pngwio.c, and pngerror.c with libpng-1.7.0
4778 Merged libpng-1.7.0 changes to make no-interlace configurations work
4779 with test programs.
4780 Revised pngvalid.c to support libpng 1.5, which does not support the
4781 PNG_MAXIMUM_INFLATE_WINDOW option, so #define it out when appropriate in
4782 pngvalid.c
4783 Allow unversioned links created on install to be disabled in configure.
4784 In configure builds 'make install' changes/adds links like png.h
4785 and libpng.a to point to the newly installed, versioned, files (e.g.
4786 libpng17/png.h and libpng17.a). Three new configure options and some
4787 rearrangement of Makefile.am allow creation of these links to be disabled.
4788
4789Version 1.6.9beta03 [January 10, 2014]
4790 Removed potentially misleading warning from png_check_IHDR().
4791
4792Version 1.6.9beta04 [January 20, 2014]
4793 Updated scripts/makefile.* to use CPPFLAGS (Cosmin).
4794 Added clang attribute support (Cosmin).
4795
4796Version 1.6.9rc01 [January 28, 2014]
4797 No changes.
4798
4799Version 1.6.9rc02 [January 30, 2014]
4800 Quiet an uninitialized memory warning from VC2013 in png_get_png().
4801
4802Version 1.6.9 [February 6, 2014]
4803
4804Version 1.6.10beta01 [February 9, 2014]
4805 Backported changes from libpng-1.7.0beta30 and beta31:
4806 Fixed a large number of instances where PNGCBAPI was omitted from
4807 function definitions.
4808 Added pngimage test program for png_read_png() and png_write_png()
4809 with two new test scripts.
4810 Removed dependence on !PNG_READ_EXPAND_SUPPORTED for calling
4811 png_set_packing() in png_read_png().
4812 Fixed combination of ~alpha with shift. On read invert alpha, processing
4813 occurred after shift processing, which causes the final values to be
4814 outside the range that should be produced by the shift. Reversing the
4815 order on read makes the two transforms work together correctly and mirrors
4816 the order used on write.
4817 Do not read invalid sBIT chunks. Previously libpng only checked sBIT
4818 values on write, so a malicious PNG writer could therefore cause
4819 the read code to return an invalid sBIT chunk, which might lead to
4820 application errors or crashes. Such chunks are now skipped (with
4821 chunk_benign_error).
4822 Make png_read_png() and png_write_png() prototypes in png.h depend
4823 upon PNG_READ_SUPPORTED and PNG_WRITE_SUPPORTED.
4824 Support builds with unsupported PNG_TRANSFORM_* values. All of the
4825 PNG_TRANSFORM_* values are always defined in png.h and, because they
4826 are used for both read and write in some cases, it is not reliable
4827 to #if out ones that are totally unsupported. This change adds error
4828 detection in png_read_image() and png_write_image() to do a
4829 png_app_error() if the app requests something that cannot be done
4830 and it adds corresponding code to pngimage.c to handle such options
4831 by not attempting to test them.
4832
4833Version 1.6.10beta02 [February 23, 2014]
4834 Moved redefines of png_error(), png_warning(), png_chunk_error(),
4835 and png_chunk_warning() from pngpriv.h to png.h to make them visible
4836 to libpng-calling applications.
4837 Moved OS dependent code from arm/arm_init.c, to allow the included
4838 implementation of the ARM NEON discovery function to be set at
4839 build-time and provide sample implementations from the current code in the
4840 contrib/arm-neon subdirectory. The __linux__ code has also been changed to
4841 compile and link on Android by using /proc/cpuinfo, and the old linux code
4842 is in contrib/arm-neon/linux-auxv.c. The new code avoids POSIX and Linux
4843 dependencies apart from opening /proc/cpuinfo and is C90 compliant.
4844 Check for info_ptr == NULL early in png_read_end() so we don't need to
4845 run all the png_handle_*() and depend on them to return if info_ptr == NULL.
4846 This improves the performance of png_read_end(png_ptr, NULL) and makes
4847 it more robust against future programming errors.
4848 Check for __has_extension before using it in pngconf.h, to
4849 support older Clang versions (Jeremy Sequoia).
4850 Treat CRC error handling with png_set_crc_action(), instead of with
4851 png_set_benign_errors(), which has been the case since libpng-1.6.0beta18.
4852 Use a user warning handler in contrib/gregbook/readpng2.c instead of default,
4853 so warnings will be put on stderr even if libpng has CONSOLE_IO disabled.
4854 Added png_ptr->process_mode = PNG_READ_IDAT_MODE in png_push_read_chunk
4855 after recognizing the IDAT chunk, which avoids an infinite loop while
4856 reading a datastream whose first IDAT chunk is of zero-length.
4857 This fixes CERT VU#684412 and CVE-2014-0333.
4858 Don't recognize known sRGB profiles as sRGB if they have been hacked,
4859 but don't reject them and don't issue a copyright violation warning.
4860
4861Version 1.6.10beta03 [February 25, 2014]
4862 Moved some documentation from png.h to libpng.3 and libpng-manual.txt
4863 Minor editing of contrib/arm-neon/README and contrib/examples/*.c
4864
4865Version 1.6.10rc01 [February 27, 2014]
4866 Fixed typos in the manual and in scripts/pnglibconf.dfa (CFLAGS -> CPPFLAGS
4867 and PNG_USR_CONFIG -> PNG_USER_CONFIG).
4868
4869Version 1.6.10rc02 [February 28, 2014]
4870 Removed unreachable return statement after png_chunk_error()
4871 in pngrutil.c
4872
4873Version 1.6.10rc03 [March 4, 2014]
4874 Un-deprecated png_data_freer().
4875
4876Version 1.6.10 [March 6, 2014]
4877 No changes.
4878
4879Version 1.6.11beta01 [March 17, 2014]
4880 Use "if (value != 0)" instead of "if (value)" consistently.
4881 Changed ZlibSrcDir from 1.2.5 to 1.2.8 in projects/vstudio.
4882 Moved configuration information from the manual to the INSTALL file.
4883
4884Version 1.6.11beta02 [April 6, 2014]
4885 Removed #if/#else/#endif from inside two pow() calls in pngvalid.c because
4886 they were handled improperly by Portland Group's PGI-14.1 - PGI-14.3
4887 when using its "__builtin_pow()" function.
4888 Silence 'unused parameter' build warnings (Cosmin Truta).
4889 $(CP) is now used alongside $(RM_F). Also, use 'copy' instead of 'cp'
4890 where applicable, and applied other minor makefile changes (Cosmin).
4891 Don't warn about invalid dimensions exceeding user limits (Cosmin).
4892 Allow an easy replacement of the default pre-built configuration
4893 header with a custom header, via the make PNGLIBCONF_H_PREBUILT
4894 macro (Cosmin).
4895
4896Version 1.6.11beta03 [April 6, 2014]
4897 Fixed a typo in pngrutil.c, introduced in libpng-1.5.6, that interferes
4898 with "blocky" expansion of sub-8-bit interlaced PNG files (Eric Huss).
4899 Optionally use __builtin_bswap16() in png_do_swap().
4900
4901Version 1.6.11beta04 [April 19, 2014]
4902 Made progressive reading of interlaced images consistent with the
4903 behavior of the sequential reader and consistent with the manual, by
4904 moving some code out of the PNG_READ_INTERLACING_SUPPORTED blocks. The
4905 row_callback now receives the proper pass number and unexpanded rows, when
4906 png_combine_row() isn't built or used, and png_set_interlace_handling()
4907 is not called.
4908 Allow PNG_sRGB_PROFILE_CHECKING = (-1) to mean no sRGB profile checking.
4909
4910Version 1.6.11beta05 [April 26, 2014]
4911 Do not reject ICC V2 profiles that lack padding (Kai-Uwe Behrmann).
4912 Relocated closing bracket of the sRGB profile test loop to avoid getting
4913 "Not recognizing known sRGB profile that has been edited" warning for
4914 ICC V2 profiles that lack the MD5 signature in the profile header.
4915
4916Version 1.6.11beta06 [May 19, 2014]
4917 Added PNG_SKIP_sRGB_CHECK_PROFILE choice for png_set_option().
4918
4919Version 1.6.11rc01 [May 27, 2014]
4920 No changes.
4921
4922Version 1.6.11rc02 [June 3, 2014]
4923 Test ZLIB_VERNUM instead of PNG_ZLIB_VERNUM in contrib/tools/pngfix.c
4924
4925Version 1.6.11 [June 5, 2014]
4926 No changes.
4927
4928Version 1.6.12rc01 [June 6, 2014]
4929 Relocated new code from 1.6.11beta06 in png.c to a point after the
4930 declarations (Max Stepin).
4931
4932Version 1.6.12rc02 [June 7, 2014]
4933 Changed file permissions of contrib/tools/intgamma.sh,
4934 test-driver, and compile from 0644 to 0755 (Cosmin).
4935
4936Version 1.6.12rc03 [June 8, 2014]
4937 Ensure "__has_attribute()" macro exists before trying to use it with
4938 old clang compilers (MacPorts Ticket #43939).
4939
4940Version 1.6.12 [June 12, 2014]
4941 No changes.
4942
4943Version 1.6.13beta01 [July 4, 2014]
4944 Quieted -Wsign-compare and -Wclobber compiler warnings in
4945 contrib/pngminus/*.c
4946 Added "(void) png_ptr;" where needed in contrib/gregbook to quiet
4947 compiler complaints about unused pointers.
4948 Split a long output string in contrib/gregbook/rpng2-x.c.
4949 Added "PNG_SET_OPTION" requirement for sRGB chunk support to pnglibconf.dfa,
4950 Needed for write-only support (John Bowler).
4951 Changed "if defined(__ARM_NEON__)" to
4952 "if (defined(__ARM_NEON__) || defined(__ARM_NEON))" (James Wu).
4953 Fixed clang no-warning builds: png_digit was defined but never used.
4954
4955Version 1.6.13beta02 [July 21, 2014]
4956 Fixed an incorrect separator ("/" should be "\") in scripts/makefile.vcwin32
4957 (bug report from Wolfgang S. Kechel). Bug was introduced in libpng-1.6.11.
4958 Also fixed makefile.bc32, makefile.bor, makefile.msc, makefile.intel, and
4959 makefile.tc3 similarly.
4960
4961Version 1.6.13beta03 [August 3, 2014]
4962 Removed scripts/makefile.elf. It has not worked since libpng-1.5.0beta14
4963 due to elimination of the PNG_FUNCTION_EXPORT and PNG_DATA_EXPORT
4964 definitions from pngconf.h.
4965 Ensure that CMakeLists.txt makes the target "lib" directory before making
4966 symbolic link into it (SourceForge bug report #226 by Rolf Timmermans).
4967
4968Version 1.6.13beta04 [August 8, 2014]
4969 Added opinion that the ECCN (Export Control Classification Number) for
4970 libpng is EAR99 to the README file.
4971 Eliminated use of "$<" in makefile explicit rules, when copying
4972 $PNGLIBCONF_H_PREBUILT. This does not work on some versions of make;
4973 bug introduced in libpng version 1.6.11.
4974
4975Version 1.6.13rc01 [August 14, 2014]
4976 Made "ccopts" agree with "CFLAGS" in scripts/makefile.hp* and makefile.*sunu
4977
4978Version 1.6.13 [August 21, 2014]
4979 No changes.
4980
4981Version 1.6.14beta01 [September 14, 2014]
4982 Guard usage of png_ptr->options with #ifdef PNG_SET_OPTION_SUPPORTED.
4983 Do not build contrib/tools/pngfix.c when PNG_SETJMP_NOT_SUPPORTED,
4984 to allow "make" to complete without setjmp support (bug report by
4985 Claudio Fontana)
4986 Add "#include <setjmp.h>" to contrib/tools/pngfix.c (John Bowler)
4987
4988Version 1.6.14beta02 [September 18, 2014]
4989 Use nanosleep() instead of usleep() in contrib/gregbook/rpng2-x.c
4990 because usleep() is deprecated.
4991 Define usleep() in contrib/gregbook/rpng2-x.c if not already defined
4992 in unistd.h and nanosleep() is not available; fixes error introduced
4993 in libpng-1.6.13.
4994 Disable floating point exception handling in pngvalid.c when
4995 PNG_FLOATING_ARITHMETIC is not supported (bug report by "zootus
4996 at users.sourceforge.net").
4997
4998Version 1.6.14beta03 [September 19, 2014]
4999 Define FE_DIVBYZERO, FE_INVALID, and FE_OVERFLOW in pngvalid.c if not
5000 already defined. Revert floating point exception handling in pngvalid.c
5001 to version 1.6.14beta01 behavior.
5002
5003Version 1.6.14beta04 [September 27, 2014]
5004 Fixed incorrect handling of the iTXt compression flag in pngrutil.c
5005 (bug report by Shunsaku Hirata). Bug was introduced in libpng-1.6.0.
5006
5007Version 1.6.14beta05 [October 1, 2014]
5008 Added "option READ_iCCP enables READ_COMPRESSED_TEXT" to pnglibconf.dfa
5009
5010Version 1.6.14beta06 [October 5, 2014]
5011 Removed unused "text_len" parameter from private function png_write_zTXt().
5012 Conditionally compile some code in png_deflate_claim(), when
5013 PNG_WARNINGS_SUPPORTED and PNG_ERROR_TEXT_SUPPORTED are disabled.
5014 Replaced repeated code in pngpread.c with PNG_PUSH_SAVE_BUFFER_IF_FULL.
5015 Added "chunk iTXt enables TEXT" and "chunk zTXt enables TEXT"
5016 to pnglibconf.dfa.
5017 Removed "option READ_COMPRESSED_TEXT enables READ_TEXT" from pnglibconf.dfa,
5018 to make it possible to configure a libpng that supports iCCP but not TEXT.
5019
5020Version 1.6.14beta07 [October 7, 2014]
5021 Removed "option WRITE_COMPRESSED_TEXT enables WRITE_TEXT" from pnglibconf.dfa
5022 Only mark text chunks as written after successfully writing them.
5023
5024Version 1.6.14rc01 [October 15, 2014]
5025 Fixed some typos in comments.
5026
5027Version 1.6.14rc02 [October 17, 2014]
5028 Changed png_convert_to_rfc_1123() to png_convert_to_rfc_1123_buffer()
5029 in the manual, to reflect the change made in libpng-1.6.0.
5030 Updated README file to explain that direct access to the png_struct
5031 and info_struct members has not been permitted since libpng-1.5.0.
5032
5033Version 1.6.14 [October 23, 2014]
5034 No changes.
5035
5036Version 1.6.15beta01 [October 29, 2014]
5037 Changed "if (!x)" to "if (x == 0)" and "if (x)" to "if (x != 0)"
5038 Simplified png_free_data().
5039 Added missing "ptr = NULL" after some instances of png_free().
5040
5041Version 1.6.15beta02 [November 1, 2014]
5042 Changed remaining "if (!x)" to "if (x == 0)" and "if (x)" to "if (x != 0)"
5043
5044Version 1.6.15beta03 [November 3, 2014]
5045 Added PNG_USE_ARM_NEON configuration flag (Marcin Juszkiewicz).
5046
5047Version 1.6.15beta04 [November 4, 2014]
5048 Removed new PNG_USE_ARM_NEON configuration flag and made a one-line
5049 revision to configure.ac to support ARM on aarch64 instead (John Bowler).
5050
5051Version 1.6.15beta05 [November 5, 2014]
5052 Use png_get_libpng_ver(NULL) instead of PNG_LIBPNG_VER_STRING in
5053 example.c, pngtest.c, and applications in the contrib directory.
5054 Avoid out-of-bounds memory access in png_user_version_check().
5055 Simplified and future-proofed png_user_version_check().
5056 Fixed GCC unsigned int->float warnings. Various versions of GCC
5057 seem to generate warnings when an unsigned value is implicitly
5058 converted to double. This is probably a GCC bug but this change
5059 avoids the issue by explicitly converting to (int) where safe.
5060 Free all allocated memory in pngimage. The file buffer cache was left
5061 allocated at the end of the program, harmless but it causes memory
5062 leak reports from clang.
5063 Fixed array size calculations to avoid warnings. At various points
5064 in the code the number of elements in an array is calculated using
5065 sizeof. This generates a compile time constant of type (size_t) which
5066 is then typically assigned to an (unsigned int) or (int). Some versions
5067 of GCC on 64-bit systems warn about the apparent narrowing, even though
5068 the same compiler does apparently generate the correct, in-range,
5069 numeric constant. This adds appropriate, safe, casts to make the
5070 warnings go away.
5071
5072Version 1.6.15beta06 [November 6, 2014]
5073 Reverted use png_get_libpng_ver(NULL) instead of PNG_LIBPNG_VER_STRING
5074 in the manual, example.c, pngtest.c, and applications in the contrib
5075 directory. It was incorrect advice.
5076
5077Version 1.6.15beta07 [November 7, 2014]
5078 Removed #ifdef PNG_16BIT_SUPPORTED/#endif around png_product2(); it is
5079 needed by png_reciprocal2().
5080 Added #ifdef PNG_16BIT_SUPPORTED/#endif around png_log16bit() and
5081 png_do_swap().
5082 Changed all "#endif /* PNG_FEATURE_SUPPORTED */" to "#endif /* FEATURE */"
5083
5084Version 1.6.15beta08 [November 8, 2014]
5085 More housecleaning in *.h
5086
5087Version 1.6.15rc01 [November 13, 2014]
5088
5089Version 1.6.15rc02 [November 14, 2014]
5090 The macros passed in the command line to Borland make were ignored if
5091 similarly-named macros were already defined in makefiles. This behavior
5092 is different from POSIX make and other make programs. Surround the
5093 macro definitions with ifndef guards (Cosmin).
5094
5095Version 1.6.15rc03 [November 16, 2014]
5096 Added "-D_CRT_SECURE_NO_WARNINGS" to CFLAGS in scripts/makefile.vcwin32.
5097 Removed the obsolete $ARCH variable from scripts/makefile.darwin.
5098
5099Version 1.6.15 [November 20, 2014]
5100 No changes.
5101
5102Version 1.6.16beta01 [December 14, 2014]
5103 Added ".align 2" to arm/filter_neon.S to support old GAS assemblers that
5104 don't do alignment correctly.
5105 Revised Makefile.am and scripts/symbols.dfn to work with MinGW/MSYS
5106 (Bob Friesenhahn).
5107
5108Version 1.6.16beta02 [December 15, 2014]
5109 Revised Makefile.am and scripts/*.dfn again to work with MinGW/MSYS;
5110 renamed scripts/*.dfn to scripts/*.c (John Bowler).
5111
5112Version 1.6.16beta03 [December 21, 2014]
5113 Quiet a "comparison always true" warning in pngstest.c (John Bowler).
5114
5115Version 1.6.16rc01 [December 21, 2014]
5116 Restored a test on width that was removed from png.c at libpng-1.6.9
5117 (Bug report by Alex Eubanks, CVE-2015-0973).
5118
5119Version 1.6.16rc02 [December 21, 2014]
5120 Undid the update to pngrutil.c in 1.6.16rc01.
5121
5122Version 1.6.16rc03 [December 21, 2014]
5123 Fixed an overflow in png_combine_row() with very wide interlaced images
5124 (Bug report and fix by John Bowler, CVE-2014-9495).
5125
5126Version 1.6.16 [December 22, 2014]
5127 No changes.
5128
5129Version 1.6.17beta01 [January 29, 2015]
5130 Removed duplicate PNG_SAFE_LIMITS_SUPPORTED handling from pngconf.h
5131 Corrected the width limit calculation in png_check_IHDR().
5132 Removed user limits from pngfix. Also pass NULL pointers to
5133 png_read_row to skip the unnecessary row de-interlace stuff.
5134 Added testing of png_set_packing() to pngvalid.c
5135 Regenerated configure scripts in the *.tar distributions with libtool-2.4.4
5136 Implement previously untested cases of libpng transforms in pngvalid.c
5137 Fixed byte order in 2-byte filler, in png_do_read_filler().
5138 Made the check for out-of-range values in png_set_tRNS() detect
5139 values that are exactly 2^bit_depth, and work on 16-bit platforms.
5140 Merged some parts of libpng-1.6.17beta01 and libpng-1.7.0beta47.
5141 Added #ifndef __COVERITY__ where needed in png.c, pngrutil.c and
5142 pngset.c to avoid warnings about dead code.
5143 Added "& 0xff" to many instances of expressions that are typecast
5144 to (png_byte), to avoid Coverity gripes.
5145
5146Version 1.6.17beta02 [February 7, 2015]
5147 Work around one more Coverity-scan dead-code warning.
5148 Do not build png_product2() when it is unused.
5149
5150Version 1.6.17beta03 [February 17, 2015]
5151 Display user limits in the output from pngtest.
5152 Eliminated the PNG_SAFE_LIMITS macro and restored the 1-million-column
5153 and 1-million-row default limits in pnglibconf.dfa, that can be reset
5154 by the user at build time or run time. This provides a more robust
5155 defense against DOS and as-yet undiscovered overflows.
5156
5157Version 1.6.17beta04 [February 21, 2015]
5158 Added PNG_WRITE_CUSTOMIZE_COMPRESSION_SUPPORTED macro, on by default.
5159 Allow user to call png_get_IHDR() with NULL arguments (Reuben Hawkins).
5160 Rebuilt configure scripts with automake-1.15 and libtool-2.4.6
5161
5162Version 1.6.17beta05 [February 25, 2015]
5163 Restored compiling of png_reciprocal2 with PNG_NO_16BIT.
5164
5165Version 1.6.17beta06 [February 27, 2015]
5166 Moved png_set_filter() prototype into a PNG_WRITE_SUPPORTED block
5167 of png.h.
5168 Avoid runtime checks when converting integer to png_byte with
5169 Visual Studio (Sergey Kosarevsky)
5170
5171Version 1.6.17rc01 [March 4, 2015]
5172 No changes.
5173
5174Version 1.6.17rc02 [March 9, 2015]
5175 Removed some comments that the configure script did not handle
5176 properly from scripts/pnglibconf.dfa and pnglibconf.h.prebuilt.
5177 Free the unknown_chunks structure even when it contains no data.
5178
5179Version 1.6.17rc03 [March 12, 2015]
5180 Updated CMakeLists.txt to add OSX framework, change YES/NO to ON/OFF
5181 for consistency, and remove some useless tests (Alexey Petruchik).
5182
5183Version 1.6.17rc04 [March 16, 2015]
5184 Remove pnglibconf.h, pnglibconf.c, and pnglibconf.out instead of
5185 pnglibconf.* in "make clean" (Cosmin).
5186 Fix bug in calculation of maxbits, in png_write_sBIT, introduced
5187 in libpng-1.6.17beta01 (John Bowler).
5188
5189Version 1.6.17rc05 [March 21, 2015]
5190 Define PNG_FILTER_* and PNG_FILTER_VALUE_* in png.h even when WRITE
5191 is not supported (John Bowler). This fixes an error introduced in
5192 libpng-1.6.17beta06.
5193 Reverted "& 0xff" additions of version 1.6.17beta01. Libpng passes
5194 the Coverity scan without them.
5195
5196Version 1.6.17rc06 [March 23, 2015]
5197 Remove pnglibconf.dfn and pnglibconf.pre with "make clean".
5198 Reformatted some "&0xff" instances to "& 0xff".
5199 Fixed simplified 8-bit-linear to sRGB alpha. The calculated alpha
5200 value was wrong. It's not clear if this affected the final stored
5201 value; in the obvious code path the upper and lower 8-bits of the
5202 alpha value were identical and the alpha was truncated to 8-bits
5203 rather than dividing by 257 (John Bowler).
5204
5205Version 1.6.17 [March 26, 2015]
5206 No changes.
5207
5208Send comments/corrections/commendations to png-mng-implement at lists.sf.net
5209(subscription required; visit
5210https://lists.sourceforge.net/lists/listinfo/png-mng-implement
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5212or to glennrp at users.sourceforge.net
5213
5214Glenn R-P