src/third-party/zlib/gzguts.h (view raw)
1/* gzguts.h -- zlib internal header definitions for gz* operations
2 * Copyright (C) 2004, 2005, 2010, 2011, 2012, 2013 Mark Adler
3 * For conditions of distribution and use, see copyright notice in zlib.h
4 */
5
6#ifdef _LARGEFILE64_SOURCE
7# ifndef _LARGEFILE_SOURCE
8# define _LARGEFILE_SOURCE 1
9# endif
10# ifdef _FILE_OFFSET_BITS
11# undef _FILE_OFFSET_BITS
12# endif
13#endif
14
15#ifdef HAVE_HIDDEN
16# define ZLIB_INTERNAL __attribute__((visibility ("hidden")))
17#else
18# define ZLIB_INTERNAL
19#endif
20
21#include <stdio.h>
22#include "zlib.h"
23#ifdef STDC
24# include <string.h>
25# include <stdlib.h>
26# include <limits.h>
27#endif
28#include <fcntl.h>
29
30#ifdef _WIN32
31# include <stddef.h>
32#endif
33
34#if defined(__TURBOC__) || defined(_MSC_VER) || defined(_WIN32)
35# include <io.h>
36#endif
37
38#ifdef WINAPI_FAMILY
39# define open _open
40# define read _read
41# define write _write
42# define close _close
43#endif
44
45#ifdef NO_DEFLATE /* for compatibility with old definition */
46# define NO_GZCOMPRESS
47#endif
48
49#if defined(STDC99) || (defined(__TURBOC__) && __TURBOC__ >= 0x550)
50# ifndef HAVE_VSNPRINTF
51# define HAVE_VSNPRINTF
52# endif
53#endif
54
55#if defined(__CYGWIN__)
56# ifndef HAVE_VSNPRINTF
57# define HAVE_VSNPRINTF
58# endif
59#endif
60
61#if defined(MSDOS) && defined(__BORLANDC__) && (BORLANDC > 0x410)
62# ifndef HAVE_VSNPRINTF
63# define HAVE_VSNPRINTF
64# endif
65#endif
66
67#ifndef HAVE_VSNPRINTF
68# ifdef MSDOS
69/* vsnprintf may exist on some MS-DOS compilers (DJGPP?),
70 but for now we just assume it doesn't. */
71# define NO_vsnprintf
72# endif
73# ifdef __TURBOC__
74# define NO_vsnprintf
75# endif
76# ifdef WIN32
77/* In Win32, vsnprintf is available as the "non-ANSI" _vsnprintf. */
78# if !defined(vsnprintf) && !defined(NO_vsnprintf)
79# if !defined(_MSC_VER) || ( defined(_MSC_VER) && _MSC_VER < 1500 )
80# define vsnprintf _vsnprintf
81# endif
82# endif
83# endif
84# ifdef __SASC
85# define NO_vsnprintf
86# endif
87# ifdef VMS
88# define NO_vsnprintf
89# endif
90# ifdef __OS400__
91# define NO_vsnprintf
92# endif
93# ifdef __MVS__
94# define NO_vsnprintf
95# endif
96#endif
97
98/* unlike snprintf (which is required in C99, yet still not supported by
99 Microsoft more than a decade later!), _snprintf does not guarantee null
100 termination of the result -- however this is only used in gzlib.c where
101 the result is assured to fit in the space provided */
102#ifdef _MSC_VER
103# define snprintf _snprintf
104#endif
105
106#ifndef local
107# define local static
108#endif
109/* compile with -Dlocal if your debugger can't find static symbols */
110
111/* gz* functions always use library allocation functions */
112#ifndef STDC
113 extern voidp malloc OF((uInt size));
114 extern void free OF((voidpf ptr));
115#endif
116
117/* get errno and strerror definition */
118#if defined UNDER_CE
119# include <windows.h>
120# define zstrerror() gz_strwinerror((DWORD)GetLastError())
121#else
122# ifndef NO_STRERROR
123# include <errno.h>
124# define zstrerror() strerror(errno)
125# else
126# define zstrerror() "stdio error (consult errno)"
127# endif
128#endif
129
130/* provide prototypes for these when building zlib without LFS */
131#if !defined(_LARGEFILE64_SOURCE) || _LFS64_LARGEFILE-0 == 0
132 ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *));
133 ZEXTERN z_off64_t ZEXPORT gzseek64 OF((gzFile, z_off64_t, int));
134 ZEXTERN z_off64_t ZEXPORT gztell64 OF((gzFile));
135 ZEXTERN z_off64_t ZEXPORT gzoffset64 OF((gzFile));
136#endif
137
138/* default memLevel */
139#if MAX_MEM_LEVEL >= 8
140# define DEF_MEM_LEVEL 8
141#else
142# define DEF_MEM_LEVEL MAX_MEM_LEVEL
143#endif
144
145/* default i/o buffer size -- double this for output when reading (this and
146 twice this must be able to fit in an unsigned type) */
147#define GZBUFSIZE 8192
148
149/* gzip modes, also provide a little integrity check on the passed structure */
150#define GZ_NONE 0
151#define GZ_READ 7247
152#define GZ_WRITE 31153
153#define GZ_APPEND 1 /* mode set to GZ_WRITE after the file is opened */
154
155/* values for gz_state how */
156#define LOOK 0 /* look for a gzip header */
157#define COPY 1 /* copy input directly */
158#define GZIP 2 /* decompress a gzip stream */
159
160/* internal gzip file state data structure */
161typedef struct {
162 /* exposed contents for gzgetc() macro */
163 struct gzFile_s x; /* "x" for exposed */
164 /* x.have: number of bytes available at x.next */
165 /* x.next: next output data to deliver or write */
166 /* x.pos: current position in uncompressed data */
167 /* used for both reading and writing */
168 int mode; /* see gzip modes above */
169 int fd; /* file descriptor */
170 char *path; /* path or fd for error messages */
171 unsigned size; /* buffer size, zero if not allocated yet */
172 unsigned want; /* requested buffer size, default is GZBUFSIZE */
173 unsigned char *in; /* input buffer */
174 unsigned char *out; /* output buffer (double-sized when reading) */
175 int direct; /* 0 if processing gzip, 1 if transparent */
176 /* just for reading */
177 int how; /* 0: get header, 1: copy, 2: decompress */
178 z_off64_t start; /* where the gzip data started, for rewinding */
179 int eof; /* true if end of input file reached */
180 int past; /* true if read requested past end */
181 /* just for writing */
182 int level; /* compression level */
183 int strategy; /* compression strategy */
184 /* seek request */
185 z_off64_t skip; /* amount to skip (already rewound if backwards) */
186 int seek; /* true if seek request pending */
187 /* error information */
188 int err; /* error code */
189 char *msg; /* error message */
190 /* zlib inflate or deflate stream */
191 z_stream strm; /* stream structure in-place (not a pointer) */
192} gz_state;
193typedef gz_state FAR *gz_statep;
194
195/* shared functions */
196void ZLIB_INTERNAL gz_error OF((gz_statep, int, const char *));
197#if defined UNDER_CE
198char ZLIB_INTERNAL *gz_strwinerror OF((DWORD error));
199#endif
200
201/* GT_OFF(x), where x is an unsigned value, is true if x > maximum z_off64_t
202 value -- needed when comparing unsigned to z_off64_t, which is signed
203 (possible z_off64_t types off_t, off64_t, and long are all signed) */
204#ifdef INT_MAX
205# define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > INT_MAX)
206#else
207unsigned ZLIB_INTERNAL gz_intmax OF((void));
208# define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > gz_intmax())
209#endif