src/util/vfs.c (view raw)
1/* Copyright (c) 2013-2014 Jeffrey Pfau
2 *
3 * This Source Code Form is subject to the terms of the Mozilla Public
4 * License, v. 2.0. If a copy of the MPL was not distributed with this
5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
6#include "util/vfs.h"
7
8#include "util/string.h"
9
10#include <fcntl.h>
11#include <dirent.h>
12#include <sys/stat.h>
13
14#ifndef _WIN32
15#include <sys/mman.h>
16#define PATH_SEP '/'
17#else
18#include <io.h>
19#include <windows.h>
20#define PATH_SEP '\\'
21#endif
22
23struct VFileFD {
24 struct VFile d;
25 int fd;
26#ifdef _WIN32
27 HANDLE hMap;
28#endif
29};
30
31static bool _vfdClose(struct VFile* vf);
32static off_t _vfdSeek(struct VFile* vf, off_t offset, int whence);
33static ssize_t _vfdRead(struct VFile* vf, void* buffer, size_t size);
34static ssize_t _vfdReadline(struct VFile* vf, char* buffer, size_t size);
35static ssize_t _vfdWrite(struct VFile* vf, const void* buffer, size_t size);
36static void* _vfdMap(struct VFile* vf, size_t size, int flags);
37static void _vfdUnmap(struct VFile* vf, void* memory, size_t size);
38static void _vfdTruncate(struct VFile* vf, size_t size);
39static ssize_t _vfdSize(struct VFile* vf);
40
41static bool _vdClose(struct VDir* vd);
42static void _vdRewind(struct VDir* vd);
43static struct VDirEntry* _vdListNext(struct VDir* vd);
44static struct VFile* _vdOpenFile(struct VDir* vd, const char* path, int mode);
45
46static const char* _vdeName(struct VDirEntry* vde);
47
48struct VFile* VFileOpen(const char* path, int flags) {
49 if (!path) {
50 return 0;
51 }
52#ifdef _WIN32
53 flags |= O_BINARY;
54#endif
55 int fd = open(path, flags, 0666);
56 return VFileFromFD(fd);
57}
58
59struct VFile* VFileFromFD(int fd) {
60 if (fd < 0) {
61 return 0;
62 }
63
64 struct VFileFD* vfd = malloc(sizeof(struct VFileFD));
65 if (!vfd) {
66 return 0;
67 }
68
69 vfd->fd = fd;
70 vfd->d.close = _vfdClose;
71 vfd->d.seek = _vfdSeek;
72 vfd->d.read = _vfdRead;
73 vfd->d.readline = _vfdReadline;
74 vfd->d.write = _vfdWrite;
75 vfd->d.map = _vfdMap;
76 vfd->d.unmap = _vfdUnmap;
77 vfd->d.truncate = _vfdTruncate;
78 vfd->d.size = _vfdSize;
79
80 return &vfd->d;
81}
82
83bool _vfdClose(struct VFile* vf) {
84 struct VFileFD* vfd = (struct VFileFD*) vf;
85 if (close(vfd->fd) < 0) {
86 return false;
87 }
88 free(vfd);
89 return true;
90}
91
92off_t _vfdSeek(struct VFile* vf, off_t offset, int whence) {
93 struct VFileFD* vfd = (struct VFileFD*) vf;
94 return lseek(vfd->fd, offset, whence);
95}
96
97ssize_t _vfdRead(struct VFile* vf, void* buffer, size_t size) {
98 struct VFileFD* vfd = (struct VFileFD*) vf;
99 return read(vfd->fd, buffer, size);
100}
101
102ssize_t _vfdReadline(struct VFile* vf, char* buffer, size_t size) {
103 struct VFileFD* vfd = (struct VFileFD*) vf;
104 size_t bytesRead = 0;
105 while (bytesRead < size - 1) {
106 size_t newRead = read(vfd->fd, &buffer[bytesRead], 1);
107 bytesRead += newRead;
108 if (!newRead || buffer[bytesRead] == '\n') {
109 break;
110 }
111 }
112 return buffer[bytesRead] = '\0';
113}
114
115ssize_t _vfdWrite(struct VFile* vf, const void* buffer, size_t size) {
116 struct VFileFD* vfd = (struct VFileFD*) vf;
117 return write(vfd->fd, buffer, size);
118}
119
120#ifndef _WIN32
121static void* _vfdMap(struct VFile* vf, size_t size, int flags) {
122 struct VFileFD* vfd = (struct VFileFD*) vf;
123 int mmapFlags = MAP_PRIVATE;
124 if (flags & MAP_WRITE) {
125 mmapFlags = MAP_SHARED;
126 }
127 return mmap(0, size, PROT_READ | PROT_WRITE, mmapFlags, vfd->fd, 0);
128}
129
130static void _vfdUnmap(struct VFile* vf, void* memory, size_t size) {
131 UNUSED(vf);
132 munmap(memory, size);
133}
134#else
135static void* _vfdMap(struct VFile* vf, size_t size, int flags) {
136 struct VFileFD* vfd = (struct VFileFD*) vf;
137 int createFlags = PAGE_WRITECOPY;
138 int mapFiles = FILE_MAP_COPY;
139 if (flags & MAP_WRITE) {
140 createFlags = PAGE_READWRITE;
141 mapFiles = FILE_MAP_WRITE;
142 }
143 size_t fileSize;
144 struct stat stat;
145 if (fstat(vfd->fd, &stat) < 0) {
146 return 0;
147 }
148 fileSize = stat.st_size;
149 if (size > fileSize) {
150 size = fileSize;
151 }
152 vfd->hMap = CreateFileMapping((HANDLE) _get_osfhandle(vfd->fd), 0, createFlags, 0, size & 0xFFFFFFFF, 0);
153 return MapViewOfFile(vfd->hMap, mapFiles, 0, 0, size);
154}
155
156static void _vfdUnmap(struct VFile* vf, void* memory, size_t size) {
157 UNUSED(size);
158 struct VFileFD* vfd = (struct VFileFD*) vf;
159 UnmapViewOfFile(memory);
160 CloseHandle(vfd->hMap);
161 vfd->hMap = 0;
162}
163#endif
164
165static void _vfdTruncate(struct VFile* vf, size_t size) {
166 struct VFileFD* vfd = (struct VFileFD*) vf;
167 ftruncate(vfd->fd, size);
168}
169
170static ssize_t _vfdSize(struct VFile* vf) {
171 struct VFileFD* vfd = (struct VFileFD*) vf;
172 struct stat stat;
173 if (fstat(vfd->fd, &stat) < 0) {
174 return -1;
175 }
176 return stat.st_size;
177}
178
179struct VDirEntryDE {
180 struct VDirEntry d;
181 struct dirent* ent;
182};
183
184struct VDirDE {
185 struct VDir d;
186 DIR* de;
187 struct VDirEntryDE vde;
188 char* path;
189};
190
191struct VDir* VDirOpen(const char* path) {
192 DIR* de = opendir(path);
193 if (!de) {
194 return 0;
195 }
196
197 struct VDirDE* vd = malloc(sizeof(struct VDirDE));
198 if (!vd) {
199 return 0;
200 }
201
202 vd->d.close = _vdClose;
203 vd->d.rewind = _vdRewind;
204 vd->d.listNext = _vdListNext;
205 vd->d.openFile = _vdOpenFile;
206 vd->path = strdup(path);
207 vd->de = de;
208
209 vd->vde.d.name = _vdeName;
210
211 return &vd->d;
212}
213
214struct VFile* VDirOptionalOpenFile(struct VDir* dir, const char* realPath, const char* prefix, const char* suffix, int mode) {
215 char path[PATH_MAX];
216 path[PATH_MAX - 1] = '\0';
217 struct VFile* vf;
218 if (!dir) {
219 if (!realPath) {
220 return 0;
221 }
222 char* dotPoint = strrchr(realPath, '.');
223 if (dotPoint - realPath + 1 >= PATH_MAX - 1) {
224 return 0;
225 }
226 if (dotPoint > strrchr(realPath, '/')) {
227 int len = dotPoint - realPath;
228 strncpy(path, realPath, len);
229 path[len] = 0;
230 strncat(path + len, suffix, PATH_MAX - len - 1);
231 } else {
232 snprintf(path, PATH_MAX - 1, "%s%s", realPath, suffix);
233 }
234 vf = VFileOpen(path, mode);
235 } else {
236 snprintf(path, PATH_MAX - 1, "%s%s", prefix, suffix);
237 vf = dir->openFile(dir, path, mode);
238 }
239 return vf;
240}
241
242struct VFile* VDirOptionalOpenIncrementFile(struct VDir* dir, const char* realPath, const char* prefix, const char* infix, const char* suffix, int mode) {
243 char path[PATH_MAX];
244 path[PATH_MAX - 1] = '\0';
245 char realPrefix[PATH_MAX];
246 realPrefix[PATH_MAX - 1] = '\0';
247 if (!dir) {
248 if (!realPath) {
249 return 0;
250 }
251 const char* separatorPoint = strrchr(realPath, '/');
252 const char* dotPoint;
253 size_t len;
254 if (!separatorPoint) {
255 strcpy(path, "./");
256 separatorPoint = realPath;
257 dotPoint = strrchr(realPath, '.');
258 } else {
259 path[0] = '\0';
260 dotPoint = strrchr(separatorPoint, '.');
261
262 if (separatorPoint - realPath + 1 >= PATH_MAX - 1) {
263 return 0;
264 }
265
266 len = separatorPoint - realPath;
267 strncat(path, realPath, len);
268 path[len] = '\0';
269 ++separatorPoint;
270 }
271
272 if (dotPoint - realPath + 1 >= PATH_MAX - 1) {
273 return 0;
274 }
275
276 if (dotPoint >= separatorPoint) {
277 len = dotPoint - separatorPoint;
278 } else {
279 len = PATH_MAX - 1;
280 }
281
282 strncpy(realPrefix, separatorPoint, len);
283 realPrefix[len] = '\0';
284
285 prefix = realPrefix;
286 dir = VDirOpen(path);
287 }
288 if (!dir) {
289 // This shouldn't be possible
290 return 0;
291 }
292 dir->rewind(dir);
293 struct VDirEntry* dirent;
294 size_t prefixLen = strlen(prefix);
295 size_t infixLen = strlen(infix);
296 unsigned next = 0;
297 while ((dirent = dir->listNext(dir))) {
298 const char* filename = dirent->name(dirent);
299 char* dotPoint = strrchr(filename, '.');
300 size_t len = strlen(filename);
301 if (dotPoint) {
302 len = (dotPoint - filename);
303 }
304 const char* separator = strnrstr(filename, infix, len);
305 if (!separator) {
306 continue;
307 }
308 len = separator - filename;
309 if (len != prefixLen) {
310 continue;
311 }
312 if (strncmp(filename, prefix, prefixLen) == 0) {
313 int nlen;
314 separator += infixLen;
315 snprintf(path, PATH_MAX - 1, "%%u%s%%n", suffix);
316 unsigned increment;
317 if (sscanf(separator, path, &increment, &nlen) < 1) {
318 continue;
319 }
320 len = strlen(separator);
321 if (nlen < (ssize_t) len) {
322 continue;
323 }
324 if (next <= increment) {
325 next = increment + 1;
326 }
327 }
328 }
329 snprintf(path, PATH_MAX - 1, "%s%s%u%s", prefix, infix, next, suffix);
330 path[PATH_MAX - 1] = '\0';
331 return dir->openFile(dir, path, mode);
332}
333
334bool _vdClose(struct VDir* vd) {
335 struct VDirDE* vdde = (struct VDirDE*) vd;
336 if (closedir(vdde->de) < 0) {
337 return false;
338 }
339 free(vdde->path);
340 free(vdde);
341 return true;
342}
343
344void _vdRewind(struct VDir* vd) {
345 struct VDirDE* vdde = (struct VDirDE*) vd;
346 rewinddir(vdde->de);
347}
348
349struct VDirEntry* _vdListNext(struct VDir* vd) {
350 struct VDirDE* vdde = (struct VDirDE*) vd;
351 vdde->vde.ent = readdir(vdde->de);
352 if (vdde->vde.ent) {
353 return &vdde->vde.d;
354 }
355
356 return 0;
357}
358
359struct VFile* _vdOpenFile(struct VDir* vd, const char* path, int mode) {
360 struct VDirDE* vdde = (struct VDirDE*) vd;
361 if (!path) {
362 return 0;
363 }
364 const char* dir = vdde->path;
365 char* combined = malloc(sizeof(char) * (strlen(path) + strlen(dir) + 2));
366 sprintf(combined, "%s%c%s", dir, PATH_SEP, path);
367
368 struct VFile* file = VFileOpen(combined, mode);
369 free(combined);
370 return file;
371}
372
373const char* _vdeName(struct VDirEntry* vde) {
374 struct VDirEntryDE* vdede = (struct VDirEntryDE*) vde;
375 if (vdede->ent) {
376 return vdede->ent->d_name;
377 }
378 return 0;
379}