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Commit | Line | Data |
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0fcfd160 LT |
1 | /* |
2 | * GIT - The information manager from hell | |
3 | * | |
4 | * Copyright (C) Linus Torvalds, 2005 | |
5 | * | |
6 | * This handles basic git sha1 object files - packing, unpacking, | |
7 | * creation etc. | |
8 | */ | |
1f688557 JH |
9 | #include <sys/types.h> |
10 | #include <dirent.h> | |
0fcfd160 | 11 | #include "cache.h" |
1f688557 | 12 | #include "delta.h" |
a733cb60 | 13 | #include "pack.h" |
0fcfd160 | 14 | |
144bde78 LT |
15 | #ifndef O_NOATIME |
16 | #if defined(__linux__) && (defined(__i386__) || defined(__PPC__)) | |
17 | #define O_NOATIME 01000000 | |
18 | #else | |
19 | #define O_NOATIME 0 | |
20 | #endif | |
21 | #endif | |
22 | ||
23 | static unsigned int sha1_file_open_flag = O_NOATIME; | |
24 | ||
0fcfd160 LT |
25 | static unsigned hexval(char c) |
26 | { | |
27 | if (c >= '0' && c <= '9') | |
28 | return c - '0'; | |
29 | if (c >= 'a' && c <= 'f') | |
30 | return c - 'a' + 10; | |
31 | if (c >= 'A' && c <= 'F') | |
32 | return c - 'A' + 10; | |
33 | return ~0; | |
34 | } | |
35 | ||
36 | int get_sha1_hex(const char *hex, unsigned char *sha1) | |
37 | { | |
38 | int i; | |
39 | for (i = 0; i < 20; i++) { | |
40 | unsigned int val = (hexval(hex[0]) << 4) | hexval(hex[1]); | |
41 | if (val & ~0xff) | |
42 | return -1; | |
43 | *sha1++ = val; | |
44 | hex += 2; | |
45 | } | |
46 | return 0; | |
47 | } | |
48 | ||
e99d59ff | 49 | static int get_sha1_file(const char *path, unsigned char *result) |
3c249c95 LT |
50 | { |
51 | char buffer[60]; | |
52 | int fd = open(path, O_RDONLY); | |
53 | int len; | |
54 | ||
55 | if (fd < 0) | |
56 | return -1; | |
57 | len = read(fd, buffer, sizeof(buffer)); | |
58 | close(fd); | |
59 | if (len < 40) | |
60 | return -1; | |
61 | return get_sha1_hex(buffer, result); | |
62 | } | |
63 | ||
95fc7512 | 64 | static char *git_dir, *git_object_dir, *git_index_file, *git_refs_dir; |
8ac069ac JH |
65 | static void setup_git_env(void) |
66 | { | |
67 | git_dir = gitenv(GIT_DIR_ENVIRONMENT); | |
68 | if (!git_dir) | |
69 | git_dir = DEFAULT_GIT_DIR_ENVIRONMENT; | |
70 | git_object_dir = gitenv(DB_ENVIRONMENT); | |
71 | if (!git_object_dir) { | |
72 | git_object_dir = xmalloc(strlen(git_dir) + 9); | |
73 | sprintf(git_object_dir, "%s/objects", git_dir); | |
74 | } | |
95fc7512 DB |
75 | git_refs_dir = xmalloc(strlen(git_dir) + 6); |
76 | sprintf(git_refs_dir, "%s/refs", git_dir); | |
8ac069ac JH |
77 | git_index_file = gitenv(INDEX_ENVIRONMENT); |
78 | if (!git_index_file) { | |
79 | git_index_file = xmalloc(strlen(git_dir) + 7); | |
80 | sprintf(git_index_file, "%s/index", git_dir); | |
81 | } | |
82 | } | |
83 | ||
84 | char *get_object_directory(void) | |
85 | { | |
86 | if (!git_object_dir) | |
87 | setup_git_env(); | |
88 | return git_object_dir; | |
89 | } | |
90 | ||
95fc7512 DB |
91 | char *get_refs_directory(void) |
92 | { | |
93 | if (!git_refs_dir) | |
94 | setup_git_env(); | |
95 | return git_refs_dir; | |
96 | } | |
97 | ||
8ac069ac JH |
98 | char *get_index_file(void) |
99 | { | |
100 | if (!git_index_file) | |
101 | setup_git_env(); | |
102 | return git_index_file; | |
103 | } | |
104 | ||
3c249c95 LT |
105 | int get_sha1(const char *str, unsigned char *sha1) |
106 | { | |
107 | static char pathname[PATH_MAX]; | |
35ad3382 LT |
108 | static const char *prefix[] = { |
109 | "", | |
110 | "refs", | |
111 | "refs/tags", | |
112 | "refs/heads", | |
113 | "refs/snap", | |
114 | NULL | |
115 | }; | |
35ad3382 | 116 | const char **p; |
3c249c95 LT |
117 | |
118 | if (!get_sha1_hex(str, sha1)) | |
119 | return 0; | |
35ad3382 | 120 | |
8ac069ac JH |
121 | if (!git_dir) |
122 | setup_git_env(); | |
35ad3382 | 123 | for (p = prefix; *p; p++) { |
8ac069ac JH |
124 | snprintf(pathname, sizeof(pathname), "%s/%s/%s", |
125 | git_dir, *p, str); | |
35ad3382 LT |
126 | if (!get_sha1_file(pathname, sha1)) |
127 | return 0; | |
128 | } | |
129 | ||
3c249c95 LT |
130 | return -1; |
131 | } | |
132 | ||
0fcfd160 LT |
133 | char * sha1_to_hex(const unsigned char *sha1) |
134 | { | |
135 | static char buffer[50]; | |
136 | static const char hex[] = "0123456789abcdef"; | |
137 | char *buf = buffer; | |
138 | int i; | |
139 | ||
140 | for (i = 0; i < 20; i++) { | |
141 | unsigned int val = *sha1++; | |
142 | *buf++ = hex[val >> 4]; | |
143 | *buf++ = hex[val & 0xf]; | |
144 | } | |
145 | return buffer; | |
146 | } | |
147 | ||
ace1534d JH |
148 | static void fill_sha1_path(char *pathbuf, const unsigned char *sha1) |
149 | { | |
150 | int i; | |
151 | for (i = 0; i < 20; i++) { | |
152 | static char hex[] = "0123456789abcdef"; | |
153 | unsigned int val = sha1[i]; | |
154 | char *pos = pathbuf + i*2 + (i > 0); | |
155 | *pos++ = hex[val >> 4]; | |
156 | *pos = hex[val & 0xf]; | |
157 | } | |
158 | } | |
159 | ||
0fcfd160 LT |
160 | /* |
161 | * NOTE! This returns a statically allocated buffer, so you have to be | |
162 | * careful about using it. Do a "strdup()" if you need to save the | |
163 | * filename. | |
ace1534d JH |
164 | * |
165 | * Also note that this returns the location for creating. Reading | |
166 | * SHA1 file can happen from any alternate directory listed in the | |
d19938ab | 167 | * DB_ENVIRONMENT environment variable if it is not found in |
ace1534d | 168 | * the primary object database. |
0fcfd160 LT |
169 | */ |
170 | char *sha1_file_name(const unsigned char *sha1) | |
171 | { | |
0fcfd160 LT |
172 | static char *name, *base; |
173 | ||
174 | if (!base) { | |
d19938ab | 175 | const char *sha1_file_directory = get_object_directory(); |
0fcfd160 | 176 | int len = strlen(sha1_file_directory); |
812666c8 | 177 | base = xmalloc(len + 60); |
0fcfd160 LT |
178 | memcpy(base, sha1_file_directory, len); |
179 | memset(base+len, 0, 60); | |
180 | base[len] = '/'; | |
181 | base[len+3] = '/'; | |
182 | name = base + len + 1; | |
183 | } | |
ace1534d | 184 | fill_sha1_path(name, sha1); |
0fcfd160 LT |
185 | return base; |
186 | } | |
187 | ||
9a217f2a | 188 | struct alternate_object_database *alt_odb; |
ace1534d | 189 | |
ddd5d056 JH |
190 | /* |
191 | * Prepare alternate object database registry. | |
192 | * alt_odb points at an array of struct alternate_object_database. | |
193 | * This array is terminated with an element that has both its base | |
194 | * and name set to NULL. alt_odb[n] comes from n'th non-empty | |
d19938ab | 195 | * element from colon separated ALTERNATE_DB_ENVIRONMENT environment |
ddd5d056 JH |
196 | * variable, and its base points at a statically allocated buffer |
197 | * that contains "/the/directory/corresponding/to/.git/objects/...", | |
198 | * while its name points just after the slash at the end of | |
199 | * ".git/objects/" in the example above, and has enough space to hold | |
200 | * 40-byte hex SHA1, an extra slash for the first level indirection, | |
201 | * and the terminating NUL. | |
202 | * This function allocates the alt_odb array and all the strings | |
203 | * pointed by base fields of the array elements with one xmalloc(); | |
204 | * the string pool immediately follows the array. | |
205 | */ | |
9a217f2a | 206 | void prepare_alt_odb(void) |
ace1534d JH |
207 | { |
208 | int pass, totlen, i; | |
ace1534d | 209 | const char *cp, *last; |
e99d59ff | 210 | char *op = NULL; |
d19938ab | 211 | const char *alt = gitenv(ALTERNATE_DB_ENVIRONMENT) ? : ""; |
ace1534d | 212 | |
9a217f2a JH |
213 | if (alt_odb) |
214 | return; | |
ddd5d056 JH |
215 | /* The first pass counts how large an area to allocate to |
216 | * hold the entire alt_odb structure, including array of | |
217 | * structs and path buffers for them. The second pass fills | |
218 | * the structure and prepares the path buffers for use by | |
219 | * fill_sha1_path(). | |
220 | */ | |
ace1534d JH |
221 | for (totlen = pass = 0; pass < 2; pass++) { |
222 | last = alt; | |
223 | i = 0; | |
224 | do { | |
225 | cp = strchr(last, ':') ? : last + strlen(last); | |
226 | if (last != cp) { | |
227 | /* 43 = 40-byte + 2 '/' + terminating NUL */ | |
228 | int pfxlen = cp - last; | |
229 | int entlen = pfxlen + 43; | |
230 | if (pass == 0) | |
231 | totlen += entlen; | |
232 | else { | |
233 | alt_odb[i].base = op; | |
234 | alt_odb[i].name = op + pfxlen + 1; | |
235 | memcpy(op, last, pfxlen); | |
236 | op[pfxlen] = op[pfxlen + 3] = '/'; | |
237 | op[entlen-1] = 0; | |
238 | op += entlen; | |
239 | } | |
240 | i++; | |
241 | } | |
242 | while (*cp && *cp == ':') | |
243 | cp++; | |
244 | last = cp; | |
245 | } while (*cp); | |
246 | if (pass) | |
247 | break; | |
ddd5d056 | 248 | alt_odb = xmalloc(sizeof(*alt_odb) * (i + 1) + totlen); |
e99d59ff | 249 | alt_odb[i].base = alt_odb[i].name = NULL; |
ace1534d JH |
250 | op = (char*)(&alt_odb[i+1]); |
251 | } | |
252 | } | |
253 | ||
254 | static char *find_sha1_file(const unsigned char *sha1, struct stat *st) | |
255 | { | |
256 | int i; | |
257 | char *name = sha1_file_name(sha1); | |
258 | ||
259 | if (!stat(name, st)) | |
260 | return name; | |
9a217f2a | 261 | prepare_alt_odb(); |
ace1534d JH |
262 | for (i = 0; (name = alt_odb[i].name) != NULL; i++) { |
263 | fill_sha1_path(name, sha1); | |
264 | if (!stat(alt_odb[i].base, st)) | |
265 | return alt_odb[i].base; | |
266 | } | |
267 | return NULL; | |
268 | } | |
269 | ||
1f688557 JH |
270 | #define PACK_MAX_SZ (1<<26) |
271 | static int pack_used_ctr; | |
272 | static unsigned long pack_mapped; | |
9a217f2a | 273 | struct packed_git *packed_git; |
1f688557 JH |
274 | |
275 | struct pack_entry { | |
276 | unsigned int offset; | |
277 | unsigned char sha1[20]; | |
278 | struct packed_git *p; | |
279 | }; | |
280 | ||
281 | static int check_packed_git_idx(const char *path, unsigned long *idx_size_, | |
282 | void **idx_map_) | |
283 | { | |
284 | void *idx_map; | |
285 | unsigned int *index; | |
286 | unsigned long idx_size; | |
287 | int nr, i; | |
288 | int fd = open(path, O_RDONLY); | |
289 | struct stat st; | |
290 | if (fd < 0) | |
291 | return -1; | |
292 | if (fstat(fd, &st)) { | |
293 | close(fd); | |
294 | return -1; | |
295 | } | |
296 | idx_size = st.st_size; | |
297 | idx_map = mmap(NULL, idx_size, PROT_READ, MAP_PRIVATE, fd, 0); | |
298 | close(fd); | |
299 | if (idx_map == MAP_FAILED) | |
300 | return -1; | |
301 | ||
302 | index = idx_map; | |
303 | ||
304 | /* check index map */ | |
305 | if (idx_size < 4*256 + 20) | |
306 | return error("index file too small"); | |
307 | nr = 0; | |
308 | for (i = 0; i < 256; i++) { | |
309 | unsigned int n = ntohl(index[i]); | |
310 | if (n < nr) | |
311 | return error("non-monotonic index"); | |
312 | nr = n; | |
313 | } | |
314 | ||
315 | /* | |
316 | * Total size: | |
317 | * - 256 index entries 4 bytes each | |
318 | * - 24-byte entries * nr (20-byte sha1 + 4-byte offset) | |
319 | * - 20-byte SHA1 of the packfile | |
320 | * - 20-byte SHA1 file checksum | |
321 | */ | |
322 | if (idx_size != 4*256 + nr * 24 + 20 + 20) | |
323 | return error("wrong index file size"); | |
324 | ||
325 | *idx_map_ = idx_map; | |
326 | *idx_size_ = idx_size; | |
327 | return 0; | |
328 | } | |
329 | ||
330 | static void unuse_one_packed_git(void) | |
331 | { | |
332 | /* NOTYET */ | |
333 | } | |
334 | ||
335 | static int use_packed_git(struct packed_git *p) | |
336 | { | |
337 | if (!p->pack_base) { | |
338 | int fd; | |
339 | struct stat st; | |
340 | void *map; | |
341 | ||
342 | pack_mapped += p->pack_size; | |
343 | while (PACK_MAX_SZ < pack_mapped) | |
344 | unuse_one_packed_git(); | |
345 | fd = open(p->pack_name, O_RDONLY); | |
346 | if (fd < 0) | |
347 | return -1; | |
348 | if (fstat(fd, &st)) { | |
349 | close(fd); | |
350 | return -1; | |
351 | } | |
352 | if (st.st_size != p->pack_size) | |
353 | return -1; | |
354 | map = mmap(NULL, p->pack_size, PROT_READ, MAP_PRIVATE, fd, 0); | |
355 | close(fd); | |
356 | if (map == MAP_FAILED) | |
357 | return -1; | |
358 | p->pack_base = map; | |
359 | } | |
360 | p->pack_last_used = pack_used_ctr++; | |
361 | return 0; | |
362 | } | |
363 | ||
364 | static struct packed_git *add_packed_git(char *path, int path_len) | |
365 | { | |
366 | struct stat st; | |
367 | struct packed_git *p; | |
368 | unsigned long idx_size; | |
369 | void *idx_map; | |
370 | ||
371 | if (check_packed_git_idx(path, &idx_size, &idx_map)) | |
372 | return NULL; | |
373 | ||
374 | /* do we have a corresponding .pack file? */ | |
375 | strcpy(path + path_len - 4, ".pack"); | |
376 | if (stat(path, &st) || !S_ISREG(st.st_mode)) { | |
377 | munmap(idx_map, idx_size); | |
378 | return NULL; | |
379 | } | |
380 | /* ok, it looks sane as far as we can check without | |
381 | * actually mapping the pack file. | |
382 | */ | |
383 | p = xmalloc(sizeof(*p) + path_len + 2); | |
384 | strcpy(p->pack_name, path); | |
385 | p->index_size = idx_size; | |
386 | p->pack_size = st.st_size; | |
387 | p->index_base = idx_map; | |
388 | p->next = NULL; | |
d85a4fee | 389 | p->pack_base = NULL; |
1f688557 JH |
390 | p->pack_last_used = 0; |
391 | return p; | |
392 | } | |
393 | ||
394 | static void prepare_packed_git_one(char *objdir) | |
395 | { | |
396 | char path[PATH_MAX]; | |
397 | int len; | |
398 | DIR *dir; | |
399 | struct dirent *de; | |
400 | ||
401 | sprintf(path, "%s/pack", objdir); | |
402 | len = strlen(path); | |
403 | dir = opendir(path); | |
404 | if (!dir) | |
405 | return; | |
406 | path[len++] = '/'; | |
407 | while ((de = readdir(dir)) != NULL) { | |
408 | int namelen = strlen(de->d_name); | |
409 | struct packed_git *p; | |
410 | ||
411 | if (strcmp(de->d_name + namelen - 4, ".idx")) | |
412 | continue; | |
413 | ||
414 | /* we have .idx. Is it a file we can map? */ | |
415 | strcpy(path + len, de->d_name); | |
416 | p = add_packed_git(path, len + namelen); | |
417 | if (!p) | |
418 | continue; | |
419 | p->next = packed_git; | |
420 | packed_git = p; | |
421 | } | |
422 | } | |
423 | ||
9a217f2a | 424 | void prepare_packed_git(void) |
1f688557 JH |
425 | { |
426 | int i; | |
427 | static int run_once = 0; | |
428 | ||
429 | if (run_once++) | |
430 | return; | |
431 | ||
432 | prepare_packed_git_one(get_object_directory()); | |
9a217f2a | 433 | prepare_alt_odb(); |
1f688557 JH |
434 | for (i = 0; alt_odb[i].base != NULL; i++) { |
435 | alt_odb[i].name[0] = 0; | |
436 | prepare_packed_git_one(alt_odb[i].base); | |
437 | } | |
438 | } | |
439 | ||
5d6ccf5c | 440 | int check_sha1_signature(const unsigned char *sha1, void *map, unsigned long size, const char *type) |
0fcfd160 | 441 | { |
d98b46f8 | 442 | char header[100]; |
0fcfd160 LT |
443 | unsigned char real_sha1[20]; |
444 | SHA_CTX c; | |
445 | ||
446 | SHA1_Init(&c); | |
d98b46f8 | 447 | SHA1_Update(&c, header, 1+sprintf(header, "%s %lu", type, size)); |
0fcfd160 LT |
448 | SHA1_Update(&c, map, size); |
449 | SHA1_Final(real_sha1, &c); | |
450 | return memcmp(sha1, real_sha1, 20) ? -1 : 0; | |
451 | } | |
452 | ||
1f688557 JH |
453 | static void *map_sha1_file_internal(const unsigned char *sha1, |
454 | unsigned long *size, | |
455 | int say_error) | |
0fcfd160 | 456 | { |
0fcfd160 LT |
457 | struct stat st; |
458 | void *map; | |
144bde78 | 459 | int fd; |
ace1534d JH |
460 | char *filename = find_sha1_file(sha1, &st); |
461 | ||
462 | if (!filename) { | |
1f688557 JH |
463 | if (say_error) |
464 | error("cannot map sha1 file %s", sha1_to_hex(sha1)); | |
ace1534d JH |
465 | return NULL; |
466 | } | |
0fcfd160 | 467 | |
144bde78 | 468 | fd = open(filename, O_RDONLY | sha1_file_open_flag); |
0fcfd160 | 469 | if (fd < 0) { |
144bde78 LT |
470 | /* See if it works without O_NOATIME */ |
471 | switch (sha1_file_open_flag) { | |
472 | default: | |
473 | fd = open(filename, O_RDONLY); | |
474 | if (fd >= 0) | |
475 | break; | |
476 | /* Fallthrough */ | |
477 | case 0: | |
1f688557 JH |
478 | if (say_error) |
479 | perror(filename); | |
144bde78 LT |
480 | return NULL; |
481 | } | |
482 | ||
1f688557 JH |
483 | /* If it failed once, it will probably fail again. |
484 | * Stop using O_NOATIME | |
485 | */ | |
144bde78 | 486 | sha1_file_open_flag = 0; |
0fcfd160 | 487 | } |
0fcfd160 LT |
488 | map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0); |
489 | close(fd); | |
490 | if (-1 == (int)(long)map) | |
491 | return NULL; | |
492 | *size = st.st_size; | |
493 | return map; | |
494 | } | |
495 | ||
1f688557 JH |
496 | void *map_sha1_file(const unsigned char *sha1, unsigned long *size) |
497 | { | |
498 | return map_sha1_file_internal(sha1, size, 1); | |
499 | } | |
500 | ||
c4483576 LT |
501 | int unpack_sha1_header(z_stream *stream, void *map, unsigned long mapsize, void *buffer, unsigned long size) |
502 | { | |
503 | /* Get the data stream */ | |
504 | memset(stream, 0, sizeof(*stream)); | |
505 | stream->next_in = map; | |
506 | stream->avail_in = mapsize; | |
507 | stream->next_out = buffer; | |
508 | stream->avail_out = size; | |
509 | ||
510 | inflateInit(stream); | |
511 | return inflate(stream, 0); | |
512 | } | |
513 | ||
5180cacc LT |
514 | void *unpack_sha1_rest(z_stream *stream, void *buffer, unsigned long size) |
515 | { | |
516 | int bytes = strlen(buffer) + 1; | |
d565b341 | 517 | unsigned char *buf = xmalloc(1+size); |
5180cacc LT |
518 | |
519 | memcpy(buf, buffer + bytes, stream->total_out - bytes); | |
520 | bytes = stream->total_out - bytes; | |
521 | if (bytes < size) { | |
522 | stream->next_out = buf + bytes; | |
523 | stream->avail_out = size - bytes; | |
524 | while (inflate(stream, Z_FINISH) == Z_OK) | |
525 | /* nothing */; | |
526 | } | |
527 | buf[size] = 0; | |
528 | inflateEnd(stream); | |
529 | return buf; | |
530 | } | |
531 | ||
532 | /* | |
533 | * We used to just use "sscanf()", but that's actually way | |
534 | * too permissive for what we want to check. So do an anal | |
535 | * object header parse by hand. | |
536 | */ | |
537 | int parse_sha1_header(char *hdr, char *type, unsigned long *sizep) | |
538 | { | |
539 | int i; | |
540 | unsigned long size; | |
541 | ||
542 | /* | |
543 | * The type can be at most ten bytes (including the | |
544 | * terminating '\0' that we add), and is followed by | |
545 | * a space. | |
546 | */ | |
547 | i = 10; | |
548 | for (;;) { | |
549 | char c = *hdr++; | |
550 | if (c == ' ') | |
551 | break; | |
552 | if (!--i) | |
553 | return -1; | |
554 | *type++ = c; | |
555 | } | |
556 | *type = 0; | |
557 | ||
558 | /* | |
559 | * The length must follow immediately, and be in canonical | |
560 | * decimal format (ie "010" is not valid). | |
561 | */ | |
562 | size = *hdr++ - '0'; | |
563 | if (size > 9) | |
564 | return -1; | |
565 | if (size) { | |
566 | for (;;) { | |
567 | unsigned long c = *hdr - '0'; | |
568 | if (c > 9) | |
569 | break; | |
570 | hdr++; | |
571 | size = size * 10 + c; | |
572 | } | |
573 | } | |
574 | *sizep = size; | |
575 | ||
576 | /* | |
577 | * The length must be followed by a zero byte | |
578 | */ | |
579 | return *hdr ? -1 : 0; | |
580 | } | |
581 | ||
0fcfd160 LT |
582 | void * unpack_sha1_file(void *map, unsigned long mapsize, char *type, unsigned long *size) |
583 | { | |
5180cacc | 584 | int ret; |
0fcfd160 | 585 | z_stream stream; |
5180cacc | 586 | char hdr[8192]; |
0fcfd160 | 587 | |
5180cacc LT |
588 | ret = unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)); |
589 | if (ret < Z_OK || parse_sha1_header(hdr, type, size) < 0) | |
0fcfd160 LT |
590 | return NULL; |
591 | ||
5180cacc | 592 | return unpack_sha1_rest(&stream, hdr, *size); |
0fcfd160 LT |
593 | } |
594 | ||
5db47c2b JH |
595 | static int packed_delta_info(unsigned char *base_sha1, |
596 | unsigned long delta_size, | |
597 | unsigned long left, | |
598 | char *type, | |
599 | unsigned long *sizep) | |
600 | { | |
601 | unsigned char *data; | |
602 | unsigned char delta_head[64]; | |
5db47c2b JH |
603 | unsigned long data_size, result_size, base_size, verify_base_size; |
604 | z_stream stream; | |
605 | int st; | |
606 | ||
607 | if (left < 20) | |
608 | die("truncated pack file"); | |
609 | if (sha1_object_info(base_sha1, type, &base_size)) | |
610 | die("cannot get info for delta-pack base"); | |
611 | ||
612 | data = base_sha1 + 20; | |
613 | data_size = left - 20; | |
614 | ||
615 | memset(&stream, 0, sizeof(stream)); | |
616 | ||
617 | stream.next_in = data; | |
618 | stream.avail_in = data_size; | |
619 | stream.next_out = delta_head; | |
620 | stream.avail_out = sizeof(delta_head); | |
621 | ||
622 | inflateInit(&stream); | |
623 | st = inflate(&stream, Z_FINISH); | |
624 | inflateEnd(&stream); | |
625 | if ((st != Z_STREAM_END) && stream.total_out != sizeof(delta_head)) | |
626 | die("delta data unpack-initial failed"); | |
627 | ||
628 | /* Examine the initial part of the delta to figure out | |
629 | * the result size. Verify the base size while we are at it. | |
630 | */ | |
631 | data = delta_head; | |
dcde55bc | 632 | verify_base_size = get_delta_hdr_size(&data); |
5db47c2b JH |
633 | if (verify_base_size != base_size) |
634 | die("delta base size mismatch"); | |
635 | ||
dcde55bc NP |
636 | /* Read the result size */ |
637 | result_size = get_delta_hdr_size(&data); | |
5db47c2b JH |
638 | *sizep = result_size; |
639 | return 0; | |
640 | } | |
641 | ||
a733cb60 LT |
642 | static unsigned long unpack_object_header(struct packed_git *p, unsigned long offset, |
643 | enum object_type *type, unsigned long *sizep) | |
644 | { | |
01247d87 | 645 | unsigned shift; |
a733cb60 LT |
646 | unsigned char *pack, c; |
647 | unsigned long size; | |
648 | ||
649 | if (offset >= p->pack_size) | |
650 | die("object offset outside of pack file"); | |
651 | ||
652 | pack = p->pack_base + offset; | |
653 | c = *pack++; | |
654 | offset++; | |
655 | *type = (c >> 4) & 7; | |
656 | size = c & 15; | |
01247d87 | 657 | shift = 4; |
a733cb60 LT |
658 | while (c & 0x80) { |
659 | if (offset >= p->pack_size) | |
660 | die("object offset outside of pack file"); | |
661 | c = *pack++; | |
662 | offset++; | |
01247d87 LT |
663 | size += (c & 0x7f) << shift; |
664 | shift += 7; | |
a733cb60 LT |
665 | } |
666 | *sizep = size; | |
667 | return offset; | |
668 | } | |
669 | ||
1f688557 JH |
670 | static int packed_object_info(struct pack_entry *entry, |
671 | char *type, unsigned long *sizep) | |
672 | { | |
673 | struct packed_git *p = entry->p; | |
674 | unsigned long offset, size, left; | |
675 | unsigned char *pack; | |
a733cb60 | 676 | enum object_type kind; |
5db47c2b JH |
677 | |
678 | if (use_packed_git(p)) | |
679 | die("cannot map packed file"); | |
680 | ||
a733cb60 | 681 | offset = unpack_object_header(p, entry->offset, &kind, &size); |
1f688557 | 682 | pack = p->pack_base + offset; |
a733cb60 LT |
683 | left = p->pack_size - offset; |
684 | ||
685 | switch (kind) { | |
686 | case OBJ_DELTA: | |
687 | return packed_delta_info(pack, size, left, type, sizep); | |
1f688557 | 688 | break; |
a733cb60 | 689 | case OBJ_COMMIT: |
1f688557 JH |
690 | strcpy(type, "commit"); |
691 | break; | |
a733cb60 | 692 | case OBJ_TREE: |
1f688557 JH |
693 | strcpy(type, "tree"); |
694 | break; | |
a733cb60 | 695 | case OBJ_BLOB: |
1f688557 JH |
696 | strcpy(type, "blob"); |
697 | break; | |
a733cb60 | 698 | case OBJ_TAG: |
a69d0943 LT |
699 | strcpy(type, "tag"); |
700 | break; | |
1f688557 JH |
701 | default: |
702 | die("corrupted pack file"); | |
703 | } | |
704 | *sizep = size; | |
705 | return 0; | |
706 | } | |
707 | ||
708 | /* forward declaration for a mutually recursive function */ | |
709 | static void *unpack_entry(struct pack_entry *, char *, unsigned long *); | |
710 | ||
711 | static void *unpack_delta_entry(unsigned char *base_sha1, | |
712 | unsigned long delta_size, | |
713 | unsigned long left, | |
714 | char *type, | |
715 | unsigned long *sizep) | |
716 | { | |
717 | void *data, *delta_data, *result, *base; | |
718 | unsigned long data_size, result_size, base_size; | |
719 | z_stream stream; | |
720 | int st; | |
721 | ||
722 | if (left < 20) | |
723 | die("truncated pack file"); | |
724 | data = base_sha1 + 20; | |
725 | data_size = left - 20; | |
726 | delta_data = xmalloc(delta_size); | |
727 | ||
728 | memset(&stream, 0, sizeof(stream)); | |
729 | ||
730 | stream.next_in = data; | |
731 | stream.avail_in = data_size; | |
732 | stream.next_out = delta_data; | |
733 | stream.avail_out = delta_size; | |
734 | ||
735 | inflateInit(&stream); | |
736 | st = inflate(&stream, Z_FINISH); | |
737 | inflateEnd(&stream); | |
738 | if ((st != Z_STREAM_END) || stream.total_out != delta_size) | |
739 | die("delta data unpack failed"); | |
740 | ||
741 | /* This may recursively unpack the base, which is what we want */ | |
742 | base = read_sha1_file(base_sha1, type, &base_size); | |
743 | if (!base) | |
744 | die("failed to read delta-pack base object %s", | |
745 | sha1_to_hex(base_sha1)); | |
746 | result = patch_delta(base, base_size, | |
747 | delta_data, delta_size, | |
748 | &result_size); | |
749 | if (!result) | |
750 | die("failed to apply delta"); | |
751 | free(delta_data); | |
752 | free(base); | |
753 | *sizep = result_size; | |
754 | return result; | |
755 | } | |
756 | ||
757 | static void *unpack_non_delta_entry(unsigned char *data, | |
758 | unsigned long size, | |
759 | unsigned long left) | |
760 | { | |
761 | int st; | |
762 | z_stream stream; | |
763 | char *buffer; | |
764 | ||
765 | buffer = xmalloc(size + 1); | |
766 | buffer[size] = 0; | |
767 | memset(&stream, 0, sizeof(stream)); | |
768 | stream.next_in = data; | |
769 | stream.avail_in = left; | |
770 | stream.next_out = buffer; | |
771 | stream.avail_out = size; | |
772 | ||
773 | inflateInit(&stream); | |
774 | st = inflate(&stream, Z_FINISH); | |
775 | inflateEnd(&stream); | |
776 | if ((st != Z_STREAM_END) || stream.total_out != size) { | |
777 | free(buffer); | |
778 | return NULL; | |
779 | } | |
780 | ||
781 | return buffer; | |
782 | } | |
783 | ||
784 | static void *unpack_entry(struct pack_entry *entry, | |
785 | char *type, unsigned long *sizep) | |
786 | { | |
787 | struct packed_git *p = entry->p; | |
788 | unsigned long offset, size, left; | |
789 | unsigned char *pack; | |
a733cb60 | 790 | enum object_type kind; |
1f688557 JH |
791 | |
792 | if (use_packed_git(p)) | |
793 | die("cannot map packed file"); | |
794 | ||
a733cb60 | 795 | offset = unpack_object_header(p, entry->offset, &kind, &size); |
1f688557 | 796 | pack = p->pack_base + offset; |
a733cb60 LT |
797 | left = p->pack_size - offset; |
798 | switch (kind) { | |
799 | case OBJ_DELTA: | |
800 | return unpack_delta_entry(pack, size, left, type, sizep); | |
801 | case OBJ_COMMIT: | |
1f688557 JH |
802 | strcpy(type, "commit"); |
803 | break; | |
a733cb60 | 804 | case OBJ_TREE: |
1f688557 JH |
805 | strcpy(type, "tree"); |
806 | break; | |
a733cb60 | 807 | case OBJ_BLOB: |
1f688557 JH |
808 | strcpy(type, "blob"); |
809 | break; | |
a733cb60 | 810 | case OBJ_TAG: |
a69d0943 LT |
811 | strcpy(type, "tag"); |
812 | break; | |
1f688557 JH |
813 | default: |
814 | die("corrupted pack file"); | |
815 | } | |
816 | *sizep = size; | |
a733cb60 | 817 | return unpack_non_delta_entry(pack, size, left); |
1f688557 JH |
818 | } |
819 | ||
9a217f2a JH |
820 | int num_packed_objects(const struct packed_git *p) |
821 | { | |
822 | /* See check_packed_git_idx and pack-objects.c */ | |
823 | return (p->index_size - 20 - 20 - 4*256) / 24; | |
824 | } | |
825 | ||
826 | int nth_packed_object_sha1(const struct packed_git *p, int n, | |
827 | unsigned char* sha1) | |
828 | { | |
829 | void *index = p->index_base + 256; | |
830 | if (n < 0 || num_packed_objects(p) <= n) | |
831 | return -1; | |
832 | memcpy(sha1, (index + 24 * n + 4), 20); | |
833 | return 0; | |
834 | } | |
835 | ||
1f688557 JH |
836 | static int find_pack_entry_1(const unsigned char *sha1, |
837 | struct pack_entry *e, struct packed_git *p) | |
838 | { | |
839 | int *level1_ofs = p->index_base; | |
840 | int hi = ntohl(level1_ofs[*sha1]); | |
841 | int lo = ((*sha1 == 0x0) ? 0 : ntohl(level1_ofs[*sha1 - 1])); | |
842 | void *index = p->index_base + 256; | |
843 | ||
844 | do { | |
845 | int mi = (lo + hi) / 2; | |
846 | int cmp = memcmp(index + 24 * mi + 4, sha1, 20); | |
847 | if (!cmp) { | |
848 | e->offset = ntohl(*((int*)(index + 24 * mi))); | |
849 | memcpy(e->sha1, sha1, 20); | |
850 | e->p = p; | |
851 | return 1; | |
852 | } | |
853 | if (cmp > 0) | |
854 | hi = mi; | |
855 | else | |
856 | lo = mi+1; | |
857 | } while (lo < hi); | |
858 | return 0; | |
859 | } | |
860 | ||
861 | static int find_pack_entry(const unsigned char *sha1, struct pack_entry *e) | |
862 | { | |
863 | struct packed_git *p; | |
864 | prepare_packed_git(); | |
865 | ||
866 | for (p = packed_git; p; p = p->next) { | |
867 | if (find_pack_entry_1(sha1, e, p)) | |
868 | return 1; | |
869 | } | |
870 | return 0; | |
871 | } | |
872 | ||
36e4d74a | 873 | int sha1_object_info(const unsigned char *sha1, char *type, unsigned long *sizep) |
65c2e0c3 | 874 | { |
36e4d74a | 875 | int status; |
65c2e0c3 JH |
876 | unsigned long mapsize, size; |
877 | void *map; | |
878 | z_stream stream; | |
36e4d74a | 879 | char hdr[128]; |
65c2e0c3 | 880 | |
1f688557 JH |
881 | map = map_sha1_file_internal(sha1, &mapsize, 0); |
882 | if (!map) { | |
883 | struct pack_entry e; | |
884 | ||
885 | if (!find_pack_entry(sha1, &e)) | |
886 | return error("unable to find %s", sha1_to_hex(sha1)); | |
887 | if (!packed_object_info(&e, type, sizep)) | |
888 | return 0; | |
889 | /* sheesh */ | |
890 | map = unpack_entry(&e, type, sizep); | |
891 | free(map); | |
892 | return (map == NULL) ? 0 : -1; | |
893 | } | |
36e4d74a JH |
894 | if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0) |
895 | status = error("unable to unpack %s header", | |
896 | sha1_to_hex(sha1)); | |
897 | if (parse_sha1_header(hdr, type, &size) < 0) | |
898 | status = error("unable to parse %s header", sha1_to_hex(sha1)); | |
c4584ae3 | 899 | else { |
65c2e0c3 | 900 | status = 0; |
c4584ae3 | 901 | *sizep = size; |
65c2e0c3 | 902 | } |
65c2e0c3 JH |
903 | inflateEnd(&stream); |
904 | munmap(map, mapsize); | |
905 | return status; | |
906 | } | |
907 | ||
1f688557 JH |
908 | static void *read_packed_sha1(const unsigned char *sha1, char *type, unsigned long *size) |
909 | { | |
910 | struct pack_entry e; | |
911 | ||
912 | if (!find_pack_entry(sha1, &e)) { | |
913 | error("cannot read sha1_file for %s", sha1_to_hex(sha1)); | |
914 | return NULL; | |
915 | } | |
916 | return unpack_entry(&e, type, size); | |
917 | } | |
918 | ||
0fcfd160 LT |
919 | void * read_sha1_file(const unsigned char *sha1, char *type, unsigned long *size) |
920 | { | |
921 | unsigned long mapsize; | |
922 | void *map, *buf; | |
923 | ||
1f688557 | 924 | map = map_sha1_file_internal(sha1, &mapsize, 0); |
0fcfd160 LT |
925 | if (map) { |
926 | buf = unpack_sha1_file(map, mapsize, type, size); | |
927 | munmap(map, mapsize); | |
928 | return buf; | |
929 | } | |
1f688557 | 930 | return read_packed_sha1(sha1, type, size); |
0fcfd160 LT |
931 | } |
932 | ||
40469ee9 | 933 | void *read_object_with_reference(const unsigned char *sha1, |
bf0f910d | 934 | const char *required_type, |
40469ee9 JH |
935 | unsigned long *size, |
936 | unsigned char *actual_sha1_return) | |
f4913f91 JH |
937 | { |
938 | char type[20]; | |
939 | void *buffer; | |
940 | unsigned long isize; | |
40469ee9 | 941 | unsigned char actual_sha1[20]; |
f4913f91 | 942 | |
40469ee9 JH |
943 | memcpy(actual_sha1, sha1, 20); |
944 | while (1) { | |
945 | int ref_length = -1; | |
946 | const char *ref_type = NULL; | |
f4913f91 | 947 | |
40469ee9 JH |
948 | buffer = read_sha1_file(actual_sha1, type, &isize); |
949 | if (!buffer) | |
950 | return NULL; | |
951 | if (!strcmp(type, required_type)) { | |
952 | *size = isize; | |
953 | if (actual_sha1_return) | |
954 | memcpy(actual_sha1_return, actual_sha1, 20); | |
955 | return buffer; | |
956 | } | |
957 | /* Handle references */ | |
958 | else if (!strcmp(type, "commit")) | |
959 | ref_type = "tree "; | |
960 | else if (!strcmp(type, "tag")) | |
961 | ref_type = "object "; | |
962 | else { | |
963 | free(buffer); | |
964 | return NULL; | |
965 | } | |
966 | ref_length = strlen(ref_type); | |
f4913f91 | 967 | |
40469ee9 JH |
968 | if (memcmp(buffer, ref_type, ref_length) || |
969 | get_sha1_hex(buffer + ref_length, actual_sha1)) { | |
970 | free(buffer); | |
971 | return NULL; | |
972 | } | |
973 | /* Now we have the ID of the referred-to object in | |
974 | * actual_sha1. Check again. */ | |
f4913f91 | 975 | } |
f4913f91 JH |
976 | } |
977 | ||
d410c0f5 JH |
978 | static char *write_sha1_file_prepare(void *buf, |
979 | unsigned long len, | |
980 | const char *type, | |
981 | unsigned char *sha1, | |
982 | unsigned char *hdr, | |
983 | int *hdrlen) | |
984 | { | |
985 | SHA_CTX c; | |
986 | ||
987 | /* Generate the header */ | |
988 | *hdrlen = sprintf((char *)hdr, "%s %lu", type, len)+1; | |
989 | ||
990 | /* Sha1.. */ | |
991 | SHA1_Init(&c); | |
992 | SHA1_Update(&c, hdr, *hdrlen); | |
993 | SHA1_Update(&c, buf, len); | |
994 | SHA1_Final(sha1, &c); | |
995 | ||
996 | return sha1_file_name(sha1); | |
997 | } | |
998 | ||
bf0f910d | 999 | int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *returnsha1) |
0fcfd160 LT |
1000 | { |
1001 | int size; | |
bf0f910d | 1002 | unsigned char *compressed; |
0fcfd160 LT |
1003 | z_stream stream; |
1004 | unsigned char sha1[20]; | |
706bc531 | 1005 | char *filename; |
aac17941 | 1006 | static char tmpfile[PATH_MAX]; |
bf0f910d | 1007 | unsigned char hdr[50]; |
aac17941 | 1008 | int fd, hdrlen, ret; |
a44c9a5e | 1009 | |
d410c0f5 JH |
1010 | /* Normally if we have it in the pack then we do not bother writing |
1011 | * it out into .git/objects/??/?{38} file. | |
1012 | */ | |
1013 | filename = write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen); | |
706bc531 LT |
1014 | if (returnsha1) |
1015 | memcpy(returnsha1, sha1, 20); | |
d410c0f5 JH |
1016 | if (has_sha1_file(sha1)) |
1017 | return 0; | |
aac17941 LT |
1018 | fd = open(filename, O_RDONLY); |
1019 | if (fd >= 0) { | |
706bc531 | 1020 | /* |
aac17941 LT |
1021 | * FIXME!!! We might do collision checking here, but we'd |
1022 | * need to uncompress the old file and check it. Later. | |
706bc531 | 1023 | */ |
aac17941 | 1024 | close(fd); |
706bc531 LT |
1025 | return 0; |
1026 | } | |
1027 | ||
aac17941 LT |
1028 | if (errno != ENOENT) { |
1029 | fprintf(stderr, "sha1 file %s: %s", filename, strerror(errno)); | |
1030 | return -1; | |
1031 | } | |
1032 | ||
1033 | snprintf(tmpfile, sizeof(tmpfile), "%s/obj_XXXXXX", get_object_directory()); | |
ace1534d | 1034 | |
aac17941 LT |
1035 | fd = mkstemp(tmpfile); |
1036 | if (fd < 0) { | |
1037 | fprintf(stderr, "unable to create temporary sha1 filename %s: %s", tmpfile, strerror(errno)); | |
1038 | return -1; | |
1039 | } | |
1040 | ||
0fcfd160 LT |
1041 | /* Set it up */ |
1042 | memset(&stream, 0, sizeof(stream)); | |
1043 | deflateInit(&stream, Z_BEST_COMPRESSION); | |
a44c9a5e | 1044 | size = deflateBound(&stream, len+hdrlen); |
812666c8 | 1045 | compressed = xmalloc(size); |
0fcfd160 LT |
1046 | |
1047 | /* Compress it */ | |
0fcfd160 LT |
1048 | stream.next_out = compressed; |
1049 | stream.avail_out = size; | |
a44c9a5e LT |
1050 | |
1051 | /* First header.. */ | |
1052 | stream.next_in = hdr; | |
1053 | stream.avail_in = hdrlen; | |
1054 | while (deflate(&stream, 0) == Z_OK) | |
6ffcee88 | 1055 | /* nothing */; |
a44c9a5e LT |
1056 | |
1057 | /* Then the data itself.. */ | |
1058 | stream.next_in = buf; | |
1059 | stream.avail_in = len; | |
0fcfd160 LT |
1060 | while (deflate(&stream, Z_FINISH) == Z_OK) |
1061 | /* nothing */; | |
1062 | deflateEnd(&stream); | |
1063 | size = stream.total_out; | |
1064 | ||
706bc531 LT |
1065 | if (write(fd, compressed, size) != size) |
1066 | die("unable to write file"); | |
aac17941 | 1067 | fchmod(fd, 0444); |
706bc531 | 1068 | close(fd); |
383f85b7 | 1069 | free(compressed); |
0fcfd160 | 1070 | |
aac17941 | 1071 | ret = link(tmpfile, filename); |
a31c6d02 | 1072 | if (ret < 0) { |
aac17941 | 1073 | ret = errno; |
a31c6d02 LT |
1074 | |
1075 | /* | |
1076 | * Coda hack - coda doesn't like cross-directory links, | |
1077 | * so we fall back to a rename, which will mean that it | |
1078 | * won't be able to check collisions, but that's not a | |
1079 | * big deal. | |
1080 | * | |
1081 | * When this succeeds, we just return 0. We have nothing | |
1082 | * left to unlink. | |
1083 | */ | |
1084 | if (ret == EXDEV && !rename(tmpfile, filename)) | |
1085 | return 0; | |
1086 | } | |
aac17941 LT |
1087 | unlink(tmpfile); |
1088 | if (ret) { | |
1089 | if (ret != EEXIST) { | |
1090 | fprintf(stderr, "unable to write sha1 filename %s: %s", filename, strerror(ret)); | |
0fcfd160 | 1091 | return -1; |
aac17941 LT |
1092 | } |
1093 | /* FIXME!!! Collision check here ? */ | |
0fcfd160 | 1094 | } |
aac17941 | 1095 | |
0fcfd160 LT |
1096 | return 0; |
1097 | } | |
8237b185 DB |
1098 | |
1099 | int write_sha1_from_fd(const unsigned char *sha1, int fd) | |
1100 | { | |
1101 | char *filename = sha1_file_name(sha1); | |
1102 | ||
1103 | int local; | |
1104 | z_stream stream; | |
1105 | unsigned char real_sha1[20]; | |
bf0f910d BG |
1106 | unsigned char buf[4096]; |
1107 | unsigned char discard[4096]; | |
8237b185 DB |
1108 | int ret; |
1109 | SHA_CTX c; | |
1110 | ||
1111 | local = open(filename, O_WRONLY | O_CREAT | O_EXCL, 0666); | |
1112 | ||
1113 | if (local < 0) | |
1114 | return error("Couldn't open %s\n", filename); | |
1115 | ||
1116 | memset(&stream, 0, sizeof(stream)); | |
1117 | ||
1118 | inflateInit(&stream); | |
1119 | ||
1120 | SHA1_Init(&c); | |
1121 | ||
1122 | do { | |
1123 | ssize_t size; | |
1124 | size = read(fd, buf, 4096); | |
1125 | if (size <= 0) { | |
1126 | close(local); | |
1127 | unlink(filename); | |
1128 | if (!size) | |
1129 | return error("Connection closed?"); | |
1130 | perror("Reading from connection"); | |
1131 | return -1; | |
1132 | } | |
1133 | write(local, buf, size); | |
1134 | stream.avail_in = size; | |
1135 | stream.next_in = buf; | |
1136 | do { | |
1137 | stream.next_out = discard; | |
1138 | stream.avail_out = sizeof(discard); | |
1139 | ret = inflate(&stream, Z_SYNC_FLUSH); | |
1140 | SHA1_Update(&c, discard, sizeof(discard) - | |
1141 | stream.avail_out); | |
1142 | } while (stream.avail_in && ret == Z_OK); | |
1143 | ||
1144 | } while (ret == Z_OK); | |
1145 | inflateEnd(&stream); | |
1146 | ||
1147 | close(local); | |
1148 | SHA1_Final(real_sha1, &c); | |
1149 | if (ret != Z_STREAM_END) { | |
1150 | unlink(filename); | |
1151 | return error("File %s corrupted", sha1_to_hex(sha1)); | |
1152 | } | |
1153 | if (memcmp(sha1, real_sha1, 20)) { | |
1154 | unlink(filename); | |
1155 | return error("File %s has bad hash\n", sha1_to_hex(sha1)); | |
1156 | } | |
1157 | ||
1158 | return 0; | |
1159 | } | |
1160 | ||
1161 | int has_sha1_file(const unsigned char *sha1) | |
1162 | { | |
8237b185 | 1163 | struct stat st; |
1f688557 JH |
1164 | struct pack_entry e; |
1165 | ||
1166 | if (find_sha1_file(sha1, &st)) | |
1167 | return 1; | |
1168 | return find_pack_entry(sha1, &e); | |
8237b185 | 1169 | } |
74400e71 JH |
1170 | |
1171 | int index_fd(unsigned char *sha1, int fd, struct stat *st) | |
1172 | { | |
74400e71 | 1173 | unsigned long size = st->st_size; |
aac17941 LT |
1174 | void *buf; |
1175 | int ret; | |
74400e71 | 1176 | |
aac17941 | 1177 | buf = ""; |
74400e71 | 1178 | if (size) |
aac17941 | 1179 | buf = mmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0); |
74400e71 | 1180 | close(fd); |
aac17941 | 1181 | if ((int)(long)buf == -1) |
74400e71 JH |
1182 | return -1; |
1183 | ||
aac17941 LT |
1184 | ret = write_sha1_file(buf, size, "blob", sha1); |
1185 | if (size) | |
1186 | munmap(buf, size); | |
1187 | return ret; | |
74400e71 | 1188 | } |