More static
[git/git.git] / sha1_file.c
CommitLineData
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 */
0fcfd160 9#include "cache.h"
1f688557 10#include "delta.h"
a733cb60 11#include "pack.h"
8e440259
PE
12#include "blob.h"
13#include "commit.h"
14#include "tag.h"
15#include "tree.h"
f35a6d3b 16#include "refs.h"
0fcfd160 17
144bde78
LT
18#ifndef O_NOATIME
19#if defined(__linux__) && (defined(__i386__) || defined(__PPC__))
20#define O_NOATIME 01000000
21#else
22#define O_NOATIME 0
23#endif
24#endif
25
e05db0fd
PR
26#ifdef NO_C99_FORMAT
27#define SZ_FMT "lu"
28#else
29#define SZ_FMT "zu"
30#endif
31
96f1e58f 32const unsigned char null_sha1[20];
88cd621d 33
144bde78
LT
34static unsigned int sha1_file_open_flag = O_NOATIME;
35
192a6be2 36const signed char hexval_table[256] = {
e49521b5
JH
37 -1, -1, -1, -1, -1, -1, -1, -1, /* 00-07 */
38 -1, -1, -1, -1, -1, -1, -1, -1, /* 08-0f */
39 -1, -1, -1, -1, -1, -1, -1, -1, /* 10-17 */
40 -1, -1, -1, -1, -1, -1, -1, -1, /* 18-1f */
41 -1, -1, -1, -1, -1, -1, -1, -1, /* 20-27 */
42 -1, -1, -1, -1, -1, -1, -1, -1, /* 28-2f */
43 0, 1, 2, 3, 4, 5, 6, 7, /* 30-37 */
44 8, 9, -1, -1, -1, -1, -1, -1, /* 38-3f */
45 -1, 10, 11, 12, 13, 14, 15, -1, /* 40-47 */
46 -1, -1, -1, -1, -1, -1, -1, -1, /* 48-4f */
47 -1, -1, -1, -1, -1, -1, -1, -1, /* 50-57 */
48 -1, -1, -1, -1, -1, -1, -1, -1, /* 58-5f */
49 -1, 10, 11, 12, 13, 14, 15, -1, /* 60-67 */
50 -1, -1, -1, -1, -1, -1, -1, -1, /* 68-67 */
51 -1, -1, -1, -1, -1, -1, -1, -1, /* 70-77 */
52 -1, -1, -1, -1, -1, -1, -1, -1, /* 78-7f */
53 -1, -1, -1, -1, -1, -1, -1, -1, /* 80-87 */
54 -1, -1, -1, -1, -1, -1, -1, -1, /* 88-8f */
55 -1, -1, -1, -1, -1, -1, -1, -1, /* 90-97 */
56 -1, -1, -1, -1, -1, -1, -1, -1, /* 98-9f */
57 -1, -1, -1, -1, -1, -1, -1, -1, /* a0-a7 */
58 -1, -1, -1, -1, -1, -1, -1, -1, /* a8-af */
59 -1, -1, -1, -1, -1, -1, -1, -1, /* b0-b7 */
60 -1, -1, -1, -1, -1, -1, -1, -1, /* b8-bf */
61 -1, -1, -1, -1, -1, -1, -1, -1, /* c0-c7 */
62 -1, -1, -1, -1, -1, -1, -1, -1, /* c8-cf */
63 -1, -1, -1, -1, -1, -1, -1, -1, /* d0-d7 */
64 -1, -1, -1, -1, -1, -1, -1, -1, /* d8-df */
65 -1, -1, -1, -1, -1, -1, -1, -1, /* e0-e7 */
66 -1, -1, -1, -1, -1, -1, -1, -1, /* e8-ef */
67 -1, -1, -1, -1, -1, -1, -1, -1, /* f0-f7 */
68 -1, -1, -1, -1, -1, -1, -1, -1, /* f8-ff */
69};
0fcfd160
LT
70
71int get_sha1_hex(const char *hex, unsigned char *sha1)
72{
73 int i;
74 for (i = 0; i < 20; i++) {
75 unsigned int val = (hexval(hex[0]) << 4) | hexval(hex[1]);
76 if (val & ~0xff)
77 return -1;
78 *sha1++ = val;
79 hex += 2;
80 }
81 return 0;
82}
83
b2cb9425
JH
84int safe_create_leading_directories(char *path)
85{
86 char *pos = path;
67d42212
JR
87 struct stat st;
88
67ffdf4c
JS
89 if (*pos == '/')
90 pos++;
b2cb9425
JH
91
92 while (pos) {
93 pos = strchr(pos, '/');
94 if (!pos)
95 break;
96 *pos = 0;
67d42212
JR
97 if (!stat(path, &st)) {
98 /* path exists */
99 if (!S_ISDIR(st.st_mode)) {
b2cb9425 100 *pos = '/';
67d42212 101 return -3;
b2cb9425 102 }
457f06d6 103 }
67d42212
JR
104 else if (mkdir(path, 0777)) {
105 *pos = '/';
106 return -1;
107 }
457f06d6
JS
108 else if (adjust_shared_perm(path)) {
109 *pos = '/';
110 return -2;
111 }
b2cb9425
JH
112 *pos++ = '/';
113 }
114 return 0;
115}
723c31fe 116
0fcfd160
LT
117char * sha1_to_hex(const unsigned char *sha1)
118{
dcb3450f
LT
119 static int bufno;
120 static char hexbuffer[4][50];
0fcfd160 121 static const char hex[] = "0123456789abcdef";
dcb3450f 122 char *buffer = hexbuffer[3 & ++bufno], *buf = buffer;
0fcfd160
LT
123 int i;
124
125 for (i = 0; i < 20; i++) {
126 unsigned int val = *sha1++;
127 *buf++ = hex[val >> 4];
128 *buf++ = hex[val & 0xf];
129 }
1e80e044
JS
130 *buf = '\0';
131
0fcfd160
LT
132 return buffer;
133}
134
ace1534d
JH
135static void fill_sha1_path(char *pathbuf, const unsigned char *sha1)
136{
137 int i;
138 for (i = 0; i < 20; i++) {
139 static char hex[] = "0123456789abcdef";
140 unsigned int val = sha1[i];
141 char *pos = pathbuf + i*2 + (i > 0);
142 *pos++ = hex[val >> 4];
143 *pos = hex[val & 0xf];
144 }
145}
146
0fcfd160
LT
147/*
148 * NOTE! This returns a statically allocated buffer, so you have to be
9befac47 149 * careful about using it. Do a "xstrdup()" if you need to save the
0fcfd160 150 * filename.
ace1534d
JH
151 *
152 * Also note that this returns the location for creating. Reading
153 * SHA1 file can happen from any alternate directory listed in the
d19938ab 154 * DB_ENVIRONMENT environment variable if it is not found in
ace1534d 155 * the primary object database.
0fcfd160
LT
156 */
157char *sha1_file_name(const unsigned char *sha1)
158{
0fcfd160
LT
159 static char *name, *base;
160
161 if (!base) {
d19938ab 162 const char *sha1_file_directory = get_object_directory();
0fcfd160 163 int len = strlen(sha1_file_directory);
812666c8 164 base = xmalloc(len + 60);
0fcfd160
LT
165 memcpy(base, sha1_file_directory, len);
166 memset(base+len, 0, 60);
167 base[len] = '/';
168 base[len+3] = '/';
169 name = base + len + 1;
170 }
ace1534d 171 fill_sha1_path(name, sha1);
0fcfd160
LT
172 return base;
173}
174
bf592c50
DB
175char *sha1_pack_name(const unsigned char *sha1)
176{
177 static const char hex[] = "0123456789abcdef";
178 static char *name, *base, *buf;
179 int i;
180
181 if (!base) {
182 const char *sha1_file_directory = get_object_directory();
183 int len = strlen(sha1_file_directory);
184 base = xmalloc(len + 60);
185 sprintf(base, "%s/pack/pack-1234567890123456789012345678901234567890.pack", sha1_file_directory);
186 name = base + len + 11;
187 }
188
189 buf = name;
190
191 for (i = 0; i < 20; i++) {
192 unsigned int val = *sha1++;
193 *buf++ = hex[val >> 4];
194 *buf++ = hex[val & 0xf];
195 }
a6080a0a 196
bf592c50
DB
197 return base;
198}
199
200char *sha1_pack_index_name(const unsigned char *sha1)
201{
202 static const char hex[] = "0123456789abcdef";
203 static char *name, *base, *buf;
204 int i;
205
206 if (!base) {
207 const char *sha1_file_directory = get_object_directory();
208 int len = strlen(sha1_file_directory);
209 base = xmalloc(len + 60);
210 sprintf(base, "%s/pack/pack-1234567890123456789012345678901234567890.idx", sha1_file_directory);
211 name = base + len + 11;
212 }
213
214 buf = name;
215
216 for (i = 0; i < 20; i++) {
217 unsigned int val = *sha1++;
218 *buf++ = hex[val >> 4];
219 *buf++ = hex[val & 0xf];
220 }
a6080a0a 221
bf592c50
DB
222 return base;
223}
224
d5a63b99
JH
225struct alternate_object_database *alt_odb_list;
226static struct alternate_object_database **alt_odb_tail;
ace1534d 227
c2f493a4
MW
228static void read_info_alternates(const char * alternates, int depth);
229
ddd5d056
JH
230/*
231 * Prepare alternate object database registry.
d5a63b99
JH
232 *
233 * The variable alt_odb_list points at the list of struct
234 * alternate_object_database. The elements on this list come from
235 * non-empty elements from colon separated ALTERNATE_DB_ENVIRONMENT
236 * environment variable, and $GIT_OBJECT_DIRECTORY/info/alternates,
1494e038
JH
237 * whose contents is similar to that environment variable but can be
238 * LF separated. Its base points at a statically allocated buffer that
d5a63b99
JH
239 * contains "/the/directory/corresponding/to/.git/objects/...", while
240 * its name points just after the slash at the end of ".git/objects/"
241 * in the example above, and has enough space to hold 40-byte hex
242 * SHA1, an extra slash for the first level indirection, and the
243 * terminating NUL.
ddd5d056 244 */
c2f493a4 245static int link_alt_odb_entry(const char * entry, int len, const char * relative_base, int depth)
ace1534d 246{
c2f493a4 247 struct stat st;
1494e038 248 const char *objdir = get_object_directory();
c2f493a4
MW
249 struct alternate_object_database *ent;
250 struct alternate_object_database *alt;
251 /* 43 = 40-byte + 2 '/' + terminating NUL */
252 int pfxlen = len;
253 int entlen = pfxlen + 43;
ccfd3e99 254 int base_len = -1;
d5a63b99 255
c2f493a4
MW
256 if (*entry != '/' && relative_base) {
257 /* Relative alt-odb */
258 if (base_len < 0)
259 base_len = strlen(relative_base) + 1;
260 entlen += base_len;
261 pfxlen += base_len;
262 }
263 ent = xmalloc(sizeof(*ent) + entlen);
264
265 if (*entry != '/' && relative_base) {
266 memcpy(ent->base, relative_base, base_len - 1);
267 ent->base[base_len - 1] = '/';
268 memcpy(ent->base + base_len, entry, len);
269 }
270 else
271 memcpy(ent->base, entry, pfxlen);
272
273 ent->name = ent->base + pfxlen + 1;
274 ent->base[pfxlen + 3] = '/';
275 ent->base[pfxlen] = ent->base[entlen-1] = 0;
276
277 /* Detect cases where alternate disappeared */
278 if (stat(ent->base, &st) || !S_ISDIR(st.st_mode)) {
279 error("object directory %s does not exist; "
280 "check .git/objects/info/alternates.",
281 ent->base);
282 free(ent);
283 return -1;
284 }
285
286 /* Prevent the common mistake of listing the same
287 * thing twice, or object directory itself.
288 */
289 for (alt = alt_odb_list; alt; alt = alt->next) {
290 if (!memcmp(ent->base, alt->base, pfxlen)) {
291 free(ent);
292 return -1;
293 }
294 }
295 if (!memcmp(ent->base, objdir, pfxlen)) {
296 free(ent);
297 return -1;
298 }
299
300 /* add the alternate entry */
301 *alt_odb_tail = ent;
302 alt_odb_tail = &(ent->next);
303 ent->next = NULL;
304
305 /* recursively add alternates */
306 read_info_alternates(ent->base, depth + 1);
307
308 ent->base[pfxlen] = '/';
309
310 return 0;
311}
312
313static void link_alt_odb_entries(const char *alt, const char *ep, int sep,
314 const char *relative_base, int depth)
315{
316 const char *cp, *last;
317
318 if (depth > 5) {
319 error("%s: ignoring alternate object stores, nesting too deep.",
320 relative_base);
321 return;
322 }
323
d5a63b99 324 last = alt;
9577e7e3
JH
325 while (last < ep) {
326 cp = last;
327 if (cp < ep && *cp == '#') {
328 while (cp < ep && *cp != sep)
329 cp++;
330 last = cp + 1;
331 continue;
332 }
c2f493a4
MW
333 while (cp < ep && *cp != sep)
334 cp++;
d5a63b99 335 if (last != cp) {
c2f493a4
MW
336 if ((*last != '/') && depth) {
337 error("%s: ignoring relative alternate object store %s",
338 relative_base, last);
339 } else {
340 link_alt_odb_entry(last, cp - last,
341 relative_base, depth);
1494e038 342 }
d5a63b99 343 }
9577e7e3 344 while (cp < ep && *cp == sep)
d5a63b99
JH
345 cp++;
346 last = cp;
9577e7e3 347 }
d5a63b99
JH
348}
349
c2f493a4 350static void read_info_alternates(const char * relative_base, int depth)
d5a63b99 351{
9577e7e3 352 char *map;
dc49cd76 353 size_t mapsz;
d5a63b99 354 struct stat st;
c2f493a4
MW
355 char path[PATH_MAX];
356 int fd;
d5a63b99 357
c2f493a4 358 sprintf(path, "%s/info/alternates", relative_base);
d5a63b99
JH
359 fd = open(path, O_RDONLY);
360 if (fd < 0)
361 return;
362 if (fstat(fd, &st) || (st.st_size == 0)) {
363 close(fd);
9a217f2a 364 return;
ace1534d 365 }
dc49cd76
SP
366 mapsz = xsize_t(st.st_size);
367 map = xmmap(NULL, mapsz, PROT_READ, MAP_PRIVATE, fd, 0);
d5a63b99 368 close(fd);
d5a63b99 369
dc49cd76 370 link_alt_odb_entries(map, map + mapsz, '\n', relative_base, depth);
c2f493a4 371
dc49cd76 372 munmap(map, mapsz);
ace1534d
JH
373}
374
c2f493a4
MW
375void prepare_alt_odb(void)
376{
554fe20d 377 const char *alt;
c2f493a4 378
7dc24aa5
SP
379 if (alt_odb_tail)
380 return;
381
c2f493a4
MW
382 alt = getenv(ALTERNATE_DB_ENVIRONMENT);
383 if (!alt) alt = "";
384
c2f493a4
MW
385 alt_odb_tail = &alt_odb_list;
386 link_alt_odb_entries(alt, alt + strlen(alt), ':', NULL, 0);
387
388 read_info_alternates(get_object_directory(), 0);
389}
390
ace1534d
JH
391static char *find_sha1_file(const unsigned char *sha1, struct stat *st)
392{
ace1534d 393 char *name = sha1_file_name(sha1);
d5a63b99 394 struct alternate_object_database *alt;
ace1534d
JH
395
396 if (!stat(name, st))
397 return name;
9a217f2a 398 prepare_alt_odb();
d5a63b99
JH
399 for (alt = alt_odb_list; alt; alt = alt->next) {
400 name = alt->name;
ace1534d 401 fill_sha1_path(name, sha1);
d5a63b99
JH
402 if (!stat(alt->base, st))
403 return alt->base;
ace1534d
JH
404 }
405 return NULL;
406}
407
60bb8b14 408static unsigned int pack_used_ctr;
a53128b6
SP
409static unsigned int pack_mmap_calls;
410static unsigned int peak_pack_open_windows;
411static unsigned int pack_open_windows;
412static size_t peak_pack_mapped;
60bb8b14 413static size_t pack_mapped;
9a217f2a 414struct packed_git *packed_git;
1f688557 415
b79d18c9 416void pack_report(void)
a53128b6
SP
417{
418 fprintf(stderr,
e05db0fd
PR
419 "pack_report: getpagesize() = %10" SZ_FMT "\n"
420 "pack_report: core.packedGitWindowSize = %10" SZ_FMT "\n"
421 "pack_report: core.packedGitLimit = %10" SZ_FMT "\n",
78a28df9 422 (size_t) getpagesize(),
a53128b6
SP
423 packed_git_window_size,
424 packed_git_limit);
425 fprintf(stderr,
426 "pack_report: pack_used_ctr = %10u\n"
427 "pack_report: pack_mmap_calls = %10u\n"
428 "pack_report: pack_open_windows = %10u / %10u\n"
e05db0fd
PR
429 "pack_report: pack_mapped = "
430 "%10" SZ_FMT " / %10" SZ_FMT "\n",
a53128b6
SP
431 pack_used_ctr,
432 pack_mmap_calls,
433 pack_open_windows, peak_pack_open_windows,
434 pack_mapped, peak_pack_mapped);
435}
436
42873078 437static int check_packed_git_idx(const char *path, struct packed_git *p)
1f688557
JH
438{
439 void *idx_map;
42873078 440 struct pack_idx_header *hdr;
dc49cd76 441 size_t idx_size;
74e34e1f 442 uint32_t version, nr, i, *index;
e93ec6f9 443 int fd = open(path, O_RDONLY);
1f688557 444 struct stat st;
42873078 445
1f688557
JH
446 if (fd < 0)
447 return -1;
448 if (fstat(fd, &st)) {
449 close(fd);
450 return -1;
451 }
dc49cd76 452 idx_size = xsize_t(st.st_size);
2d88451b
SP
453 if (idx_size < 4 * 256 + 20 + 20) {
454 close(fd);
455 return error("index file %s is too small", path);
456 }
c4712e45 457 idx_map = xmmap(NULL, idx_size, PROT_READ, MAP_PRIVATE, fd, 0);
1f688557 458 close(fd);
1f688557 459
42873078
NP
460 hdr = idx_map;
461 if (hdr->idx_signature == htonl(PACK_IDX_SIGNATURE)) {
74e34e1f
NP
462 version = ntohl(hdr->idx_version);
463 if (version < 2 || version > 2) {
464 munmap(idx_map, idx_size);
465 return error("index file %s is version %d"
466 " and is not supported by this binary"
467 " (try upgrading GIT to a newer version)",
468 path, version);
469 }
470 } else
471 version = 1;
df1b059d 472
1f688557 473 nr = 0;
42873078 474 index = idx_map;
74e34e1f
NP
475 if (version > 1)
476 index += 2; /* skip index header */
1f688557 477 for (i = 0; i < 256; i++) {
326bf396 478 uint32_t n = ntohl(index[i]);
2d88451b
SP
479 if (n < nr) {
480 munmap(idx_map, idx_size);
df1b059d 481 return error("non-monotonic index %s", path);
2d88451b 482 }
1f688557
JH
483 nr = n;
484 }
485
74e34e1f
NP
486 if (version == 1) {
487 /*
488 * Total size:
489 * - 256 index entries 4 bytes each
490 * - 24-byte entries * nr (20-byte sha1 + 4-byte offset)
491 * - 20-byte SHA1 of the packfile
492 * - 20-byte SHA1 file checksum
493 */
494 if (idx_size != 4*256 + nr * 24 + 20 + 20) {
495 munmap(idx_map, idx_size);
496 return error("wrong index file size in %s", path);
497 }
498 } else if (version == 2) {
499 /*
500 * Minimum size:
501 * - 8 bytes of header
502 * - 256 index entries 4 bytes each
503 * - 20-byte sha1 entry * nr
504 * - 4-byte crc entry * nr
505 * - 4-byte offset entry * nr
506 * - 20-byte SHA1 of the packfile
507 * - 20-byte SHA1 file checksum
508 * And after the 4-byte offset table might be a
509 * variable sized table containing 8-byte entries
510 * for offsets larger than 2^31.
511 */
512 unsigned long min_size = 8 + 4*256 + nr*(20 + 4 + 4) + 20 + 20;
513 if (idx_size < min_size || idx_size > min_size + (nr - 1)*8) {
514 munmap(idx_map, idx_size);
515 return error("wrong index file size in %s", path);
516 }
517 if (idx_size != min_size) {
518 /* make sure we can deal with large pack offsets */
519 off_t x = 0x7fffffffUL, y = 0xffffffffUL;
520 if (x > (x + 1) || y > (y + 1)) {
521 munmap(idx_map, idx_size);
522 return error("pack too large for current definition of off_t in %s", path);
523 }
524 }
2d88451b 525 }
1f688557 526
74e34e1f 527 p->index_version = version;
42873078
NP
528 p->index_data = idx_map;
529 p->index_size = idx_size;
57059091 530 p->num_objects = nr;
1f688557
JH
531 return 0;
532}
533
bc8e478a 534int open_pack_index(struct packed_git *p)
d079837e
SP
535{
536 char *idx_name;
537 int ret;
538
539 if (p->index_data)
540 return 0;
541
542 idx_name = xstrdup(p->pack_name);
543 strcpy(idx_name + strlen(idx_name) - strlen(".pack"), ".idx");
544 ret = check_packed_git_idx(idx_name, p);
545 free(idx_name);
546 return ret;
547}
548
11daf39b
SP
549static void scan_windows(struct packed_git *p,
550 struct packed_git **lru_p,
551 struct pack_window **lru_w,
552 struct pack_window **lru_l)
1f688557 553{
11daf39b
SP
554 struct pack_window *w, *w_l;
555
556 for (w_l = NULL, w = p->windows; w; w = w->next) {
557 if (!w->inuse_cnt) {
558 if (!*lru_w || w->last_used < (*lru_w)->last_used) {
559 *lru_p = p;
560 *lru_w = w;
561 *lru_l = w_l;
54044bf8 562 }
54044bf8 563 }
11daf39b 564 w_l = w;
f9253394 565 }
11daf39b
SP
566}
567
d1efefa4 568static int unuse_one_window(struct packed_git *current, int keep_fd)
11daf39b
SP
569{
570 struct packed_git *p, *lru_p = NULL;
571 struct pack_window *lru_w = NULL, *lru_l = NULL;
572
573 if (current)
574 scan_windows(current, &lru_p, &lru_w, &lru_l);
575 for (p = packed_git; p; p = p->next)
576 scan_windows(p, &lru_p, &lru_w, &lru_l);
54044bf8
SP
577 if (lru_p) {
578 munmap(lru_w->base, lru_w->len);
579 pack_mapped -= lru_w->len;
580 if (lru_l)
581 lru_l->next = lru_w->next;
582 else {
583 lru_p->windows = lru_w->next;
d1efefa4 584 if (!lru_p->windows && lru_p->pack_fd != keep_fd) {
54044bf8
SP
585 close(lru_p->pack_fd);
586 lru_p->pack_fd = -1;
587 }
588 }
589 free(lru_w);
a53128b6 590 pack_open_windows--;
54044bf8
SP
591 return 1;
592 }
593 return 0;
f9253394
JH
594}
595
d1efefa4 596void release_pack_memory(size_t need, int fd)
97bfeb34
SP
597{
598 size_t cur = pack_mapped;
d1efefa4 599 while (need >= (cur - pack_mapped) && unuse_one_window(NULL, fd))
97bfeb34
SP
600 ; /* nothing */
601}
602
03e79c88 603void unuse_pack(struct pack_window **w_cursor)
f9253394 604{
03e79c88
SP
605 struct pack_window *w = *w_cursor;
606 if (w) {
607 w->inuse_cnt--;
608 *w_cursor = NULL;
609 }
1f688557
JH
610}
611
3cf8b462
SP
612/*
613 * Do not call this directly as this leaks p->pack_fd on error return;
614 * call open_packed_git() instead.
615 */
616static int open_packed_git_1(struct packed_git *p)
1f688557 617{
9bc879c1
SP
618 struct stat st;
619 struct pack_header hdr;
620 unsigned char sha1[20];
621 unsigned char *idx_sha1;
2c039da8 622 long fd_flag;
9bc879c1 623
d079837e
SP
624 if (!p->index_data && open_pack_index(p))
625 return error("packfile %s index unavailable", p->pack_name);
626
9bc879c1
SP
627 p->pack_fd = open(p->pack_name, O_RDONLY);
628 if (p->pack_fd < 0 || fstat(p->pack_fd, &st))
072db278 629 return -1;
9bc879c1
SP
630
631 /* If we created the struct before we had the pack we lack size. */
bf592c50 632 if (!p->pack_size) {
bf592c50 633 if (!S_ISREG(st.st_mode))
072db278 634 return error("packfile %s not a regular file", p->pack_name);
bf592c50 635 p->pack_size = st.st_size;
9bc879c1 636 } else if (p->pack_size != st.st_size)
072db278 637 return error("packfile %s size changed", p->pack_name);
9bc879c1 638
2c039da8
JH
639 /* We leave these file descriptors open with sliding mmap;
640 * there is no point keeping them open across exec(), though.
641 */
642 fd_flag = fcntl(p->pack_fd, F_GETFD, 0);
643 if (fd_flag < 0)
072db278 644 return error("cannot determine file descriptor flags");
2c039da8
JH
645 fd_flag |= FD_CLOEXEC;
646 if (fcntl(p->pack_fd, F_SETFD, fd_flag) == -1)
072db278 647 return error("cannot set FD_CLOEXEC");
2c039da8 648
9bc879c1 649 /* Verify we recognize this pack file format. */
e6e2bd62 650 if (read_in_full(p->pack_fd, &hdr, sizeof(hdr)) != sizeof(hdr))
072db278 651 return error("file %s is far too short to be a packfile", p->pack_name);
9bc879c1 652 if (hdr.hdr_signature != htonl(PACK_SIGNATURE))
072db278 653 return error("file %s is not a GIT packfile", p->pack_name);
9bc879c1 654 if (!pack_version_ok(hdr.hdr_version))
072db278 655 return error("packfile %s is version %u and not supported"
9bc879c1
SP
656 " (try upgrading GIT to a newer version)",
657 p->pack_name, ntohl(hdr.hdr_version));
658
659 /* Verify the pack matches its index. */
57059091 660 if (p->num_objects != ntohl(hdr.hdr_entries))
072db278 661 return error("packfile %s claims to have %u objects"
57059091
NP
662 " while index indicates %u objects",
663 p->pack_name, ntohl(hdr.hdr_entries),
664 p->num_objects);
9bc879c1 665 if (lseek(p->pack_fd, p->pack_size - sizeof(sha1), SEEK_SET) == -1)
072db278 666 return error("end of packfile %s is unavailable", p->pack_name);
e6e2bd62 667 if (read_in_full(p->pack_fd, sha1, sizeof(sha1)) != sizeof(sha1))
072db278 668 return error("packfile %s signature is unavailable", p->pack_name);
42873078 669 idx_sha1 = ((unsigned char *)p->index_data) + p->index_size - 40;
9bc879c1 670 if (hashcmp(sha1, idx_sha1))
072db278
SP
671 return error("packfile %s does not match index", p->pack_name);
672 return 0;
9bc879c1
SP
673}
674
3cf8b462
SP
675static int open_packed_git(struct packed_git *p)
676{
677 if (!open_packed_git_1(p))
678 return 0;
679 if (p->pack_fd != -1) {
680 close(p->pack_fd);
681 p->pack_fd = -1;
682 }
683 return -1;
684}
685
c4001d92 686static int in_window(struct pack_window *win, off_t offset)
60bb8b14
SP
687{
688 /* We must promise at least 20 bytes (one hash) after the
689 * offset is available from this window, otherwise the offset
690 * is not actually in this window and a different window (which
691 * has that one hash excess) must be used. This is to support
692 * the object header and delta base parsing routines below.
693 */
694 off_t win_off = win->offset;
695 return win_off <= offset
696 && (offset + 20) <= (win_off + win->len);
697}
698
03e79c88
SP
699unsigned char* use_pack(struct packed_git *p,
700 struct pack_window **w_cursor,
c4001d92 701 off_t offset,
03e79c88 702 unsigned int *left)
9bc879c1 703{
60bb8b14 704 struct pack_window *win = *w_cursor;
03e79c88 705
072db278
SP
706 if (p->pack_fd == -1 && open_packed_git(p))
707 die("packfile %s cannot be accessed", p->pack_name);
60bb8b14
SP
708
709 /* Since packfiles end in a hash of their content and its
710 * pointless to ask for an offset into the middle of that
711 * hash, and the in_window function above wouldn't match
712 * don't allow an offset too close to the end of the file.
713 */
714 if (offset > (p->pack_size - 20))
715 die("offset beyond end of packfile (truncated pack?)");
716
717 if (!win || !in_window(win, offset)) {
718 if (win)
719 win->inuse_cnt--;
720 for (win = p->windows; win; win = win->next) {
721 if (in_window(win, offset))
722 break;
723 }
724 if (!win) {
78a28df9 725 size_t window_align = packed_git_window_size / 2;
dc49cd76 726 off_t len;
60bb8b14 727 win = xcalloc(1, sizeof(*win));
78a28df9 728 win->offset = (offset / window_align) * window_align;
dc49cd76
SP
729 len = p->pack_size - win->offset;
730 if (len > packed_git_window_size)
731 len = packed_git_window_size;
732 win->len = (size_t)len;
60bb8b14 733 pack_mapped += win->len;
11daf39b 734 while (packed_git_limit < pack_mapped
d1efefa4 735 && unuse_one_window(p, p->pack_fd))
60bb8b14 736 ; /* nothing */
c4712e45 737 win->base = xmmap(NULL, win->len,
60bb8b14
SP
738 PROT_READ, MAP_PRIVATE,
739 p->pack_fd, win->offset);
740 if (win->base == MAP_FAILED)
73b4e4be
SP
741 die("packfile %s cannot be mapped: %s",
742 p->pack_name,
743 strerror(errno));
a53128b6
SP
744 pack_mmap_calls++;
745 pack_open_windows++;
746 if (pack_mapped > peak_pack_mapped)
747 peak_pack_mapped = pack_mapped;
748 if (pack_open_windows > peak_pack_open_windows)
749 peak_pack_open_windows = pack_open_windows;
60bb8b14
SP
750 win->next = p->windows;
751 p->windows = win;
752 }
1f688557 753 }
03e79c88
SP
754 if (win != *w_cursor) {
755 win->last_used = pack_used_ctr++;
756 win->inuse_cnt++;
757 *w_cursor = win;
758 }
60bb8b14 759 offset -= win->offset;
03e79c88 760 if (left)
dc49cd76 761 *left = win->len - xsize_t(offset);
03e79c88 762 return win->base + offset;
1f688557
JH
763}
764
42873078 765struct packed_git *add_packed_git(const char *path, int path_len, int local)
1f688557
JH
766{
767 struct stat st;
42873078 768 struct packed_git *p = xmalloc(sizeof(*p) + path_len + 2);
1f688557 769
42873078
NP
770 /*
771 * Make sure a corresponding .pack file exists and that
772 * the index looks sane.
773 */
774 path_len -= strlen(".idx");
775 if (path_len < 1)
1f688557 776 return NULL;
42873078
NP
777 memcpy(p->pack_name, path, path_len);
778 strcpy(p->pack_name + path_len, ".pack");
d079837e 779 if (stat(p->pack_name, &st) || !S_ISREG(st.st_mode)) {
42873078 780 free(p);
1f688557
JH
781 return NULL;
782 }
42873078 783
1f688557
JH
784 /* ok, it looks sane as far as we can check without
785 * actually mapping the pack file.
786 */
d079837e
SP
787 p->index_version = 0;
788 p->index_data = NULL;
789 p->index_size = 0;
790 p->num_objects = 0;
1f688557 791 p->pack_size = st.st_size;
1f688557 792 p->next = NULL;
c41ee586 793 p->windows = NULL;
9bc879c1 794 p->pack_fd = -1;
9d835df2 795 p->pack_local = local;
b867092f 796 p->mtime = st.st_mtime;
42873078
NP
797 if (path_len < 40 || get_sha1_hex(path + path_len - 40, p->sha1))
798 hashclr(p->sha1);
1f688557
JH
799 return p;
800}
801
bf592c50 802struct packed_git *parse_pack_index(unsigned char *sha1)
c508df5e
DB
803{
804 char *path = sha1_pack_index_name(sha1);
805 return parse_pack_index_file(sha1, path);
806}
807
42873078
NP
808struct packed_git *parse_pack_index_file(const unsigned char *sha1,
809 const char *idx_path)
bf592c50 810{
42873078
NP
811 const char *path = sha1_pack_name(sha1);
812 struct packed_git *p = xmalloc(sizeof(*p) + strlen(path) + 2);
bf592c50 813
42873078
NP
814 if (check_packed_git_idx(idx_path, p)) {
815 free(p);
bf592c50 816 return NULL;
42873078 817 }
bf592c50 818
bf592c50 819 strcpy(p->pack_name, path);
bf592c50 820 p->pack_size = 0;
bf592c50 821 p->next = NULL;
c41ee586 822 p->windows = NULL;
9bc879c1 823 p->pack_fd = -1;
e702496e 824 hashcpy(p->sha1, sha1);
bf592c50
DB
825 return p;
826}
827
828void install_packed_git(struct packed_git *pack)
829{
830 pack->next = packed_git;
831 packed_git = pack;
832}
833
9d835df2 834static void prepare_packed_git_one(char *objdir, int local)
1f688557
JH
835{
836 char path[PATH_MAX];
837 int len;
838 DIR *dir;
839 struct dirent *de;
840
841 sprintf(path, "%s/pack", objdir);
842 len = strlen(path);
843 dir = opendir(path);
b5b16990 844 if (!dir) {
26125f6b 845 if (errno != ENOENT)
bd2afde8 846 error("unable to open object pack directory: %s: %s",
26125f6b 847 path, strerror(errno));
1f688557 848 return;
b5b16990 849 }
1f688557
JH
850 path[len++] = '/';
851 while ((de = readdir(dir)) != NULL) {
852 int namelen = strlen(de->d_name);
853 struct packed_git *p;
854
5bb1cda5 855 if (!has_extension(de->d_name, ".idx"))
1f688557
JH
856 continue;
857
54a15a8d 858 /* Don't reopen a pack we already have. */
1f688557 859 strcpy(path + len, de->d_name);
86f7780c
JK
860 for (p = packed_git; p; p = p->next) {
861 if (!memcmp(path, p->pack_name, len + namelen - 4))
862 break;
863 }
864 if (p)
865 continue;
54a15a8d
SP
866 /* See if it really is a valid .idx file with corresponding
867 * .pack file that we can map.
868 */
9d835df2 869 p = add_packed_git(path, len + namelen, local);
1f688557
JH
870 if (!p)
871 continue;
625e9421 872 install_packed_git(p);
1f688557 873 }
5b35bcd5 874 closedir(dir);
1f688557
JH
875}
876
b867092f
JH
877static int sort_pack(const void *a_, const void *b_)
878{
879 struct packed_git *a = *((struct packed_git **)a_);
880 struct packed_git *b = *((struct packed_git **)b_);
881 int st;
882
883 /*
884 * Local packs tend to contain objects specific to our
885 * variant of the project than remote ones. In addition,
886 * remote ones could be on a network mounted filesystem.
887 * Favor local ones for these reasons.
888 */
889 st = a->pack_local - b->pack_local;
890 if (st)
891 return -st;
892
893 /*
894 * Younger packs tend to contain more recent objects,
895 * and more recent objects tend to get accessed more
896 * often.
897 */
898 if (a->mtime < b->mtime)
899 return 1;
900 else if (a->mtime == b->mtime)
901 return 0;
902 return -1;
903}
904
905static void rearrange_packed_git(void)
906{
907 struct packed_git **ary, *p;
908 int i, n;
909
910 for (n = 0, p = packed_git; p; p = p->next)
911 n++;
912 if (n < 2)
913 return;
914
915 /* prepare an array of packed_git for easier sorting */
916 ary = xcalloc(n, sizeof(struct packed_git *));
917 for (n = 0, p = packed_git; p; p = p->next)
918 ary[n++] = p;
919
920 qsort(ary, n, sizeof(struct packed_git *), sort_pack);
921
922 /* link them back again */
923 for (i = 0; i < n - 1; i++)
924 ary[i]->next = ary[i + 1];
925 ary[n - 1]->next = NULL;
926 packed_git = ary[0];
927
928 free(ary);
929}
930
637cdd9d 931static int prepare_packed_git_run_once = 0;
9a217f2a 932void prepare_packed_git(void)
1f688557 933{
d5a63b99 934 struct alternate_object_database *alt;
1f688557 935
637cdd9d 936 if (prepare_packed_git_run_once)
1f688557 937 return;
9d835df2 938 prepare_packed_git_one(get_object_directory(), 1);
9a217f2a 939 prepare_alt_odb();
d5a63b99 940 for (alt = alt_odb_list; alt; alt = alt->next) {
1494e038 941 alt->name[-1] = 0;
9d835df2 942 prepare_packed_git_one(alt->base, 0);
1494e038 943 alt->name[-1] = '/';
1f688557 944 }
b867092f 945 rearrange_packed_git();
637cdd9d
JK
946 prepare_packed_git_run_once = 1;
947}
948
fc04c412 949void reprepare_packed_git(void)
637cdd9d
JK
950{
951 prepare_packed_git_run_once = 0;
952 prepare_packed_git();
1f688557
JH
953}
954
5d6ccf5c 955int check_sha1_signature(const unsigned char *sha1, void *map, unsigned long size, const char *type)
0fcfd160
LT
956{
957 unsigned char real_sha1[20];
7cfb5f36 958 hash_sha1_file(map, size, type, real_sha1);
a89fccd2 959 return hashcmp(sha1, real_sha1) ? -1 : 0;
0fcfd160
LT
960}
961
4175e9e3 962static void *map_sha1_file(const unsigned char *sha1, unsigned long *size)
0fcfd160 963{
0fcfd160
LT
964 struct stat st;
965 void *map;
144bde78 966 int fd;
ace1534d
JH
967 char *filename = find_sha1_file(sha1, &st);
968
969 if (!filename) {
ace1534d
JH
970 return NULL;
971 }
0fcfd160 972
144bde78 973 fd = open(filename, O_RDONLY | sha1_file_open_flag);
0fcfd160 974 if (fd < 0) {
144bde78
LT
975 /* See if it works without O_NOATIME */
976 switch (sha1_file_open_flag) {
977 default:
978 fd = open(filename, O_RDONLY);
979 if (fd >= 0)
980 break;
981 /* Fallthrough */
982 case 0:
144bde78
LT
983 return NULL;
984 }
985
1f688557
JH
986 /* If it failed once, it will probably fail again.
987 * Stop using O_NOATIME
988 */
144bde78 989 sha1_file_open_flag = 0;
0fcfd160 990 }
dc49cd76
SP
991 *size = xsize_t(st.st_size);
992 map = xmmap(NULL, *size, PROT_READ, MAP_PRIVATE, fd, 0);
0fcfd160 993 close(fd);
0fcfd160
LT
994 return map;
995}
996
726f852b 997static int legacy_loose_object(unsigned char *map)
bb6b8e4f
JH
998{
999 unsigned int word;
1000
1001 /*
1002 * Is it a zlib-compressed buffer? If so, the first byte
1003 * must be 0x78 (15-bit window size, deflated), and the
1004 * first 16-bit word is evenly divisible by 31
1005 */
1006 word = (map[0] << 8) + map[1];
1007 if (map[0] == 0x78 && !(word % 31))
1008 return 1;
1009 else
1010 return 0;
1011}
1012
72518e9c 1013unsigned long unpack_object_header_gently(const unsigned char *buf, unsigned long len, enum object_type *type, unsigned long *sizep)
c4483576 1014{
ad1ed5ee 1015 unsigned shift;
93821bd9 1016 unsigned char c;
93821bd9 1017 unsigned long size;
ad1ed5ee
JH
1018 unsigned long used = 0;
1019
1020 c = buf[used++];
1021 *type = (c >> 4) & 7;
1022 size = c & 15;
1023 shift = 4;
1024 while (c & 0x80) {
1025 if (len <= used)
1026 return 0;
1027 if (sizeof(long) * 8 <= shift)
1028 return 0;
1029 c = buf[used++];
1030 size += (c & 0x7f) << shift;
1031 shift += 7;
1032 }
1033 *sizep = size;
1034 return used;
1035}
1036
1037static int unpack_sha1_header(z_stream *stream, unsigned char *map, unsigned long mapsize, void *buffer, unsigned long bufsiz)
1038{
1039 unsigned long size, used;
1040 static const char valid_loose_object_type[8] = {
1041 0, /* OBJ_EXT */
1042 1, 1, 1, 1, /* "commit", "tree", "blob", "tag" */
1043 0, /* "delta" and others are invalid in a loose object */
93821bd9 1044 };
ad1ed5ee 1045 enum object_type type;
93821bd9 1046
c4483576
LT
1047 /* Get the data stream */
1048 memset(stream, 0, sizeof(*stream));
1049 stream->next_in = map;
1050 stream->avail_in = mapsize;
1051 stream->next_out = buffer;
93821bd9
LT
1052 stream->avail_out = bufsiz;
1053
bb6b8e4f 1054 if (legacy_loose_object(map)) {
93821bd9
LT
1055 inflateInit(stream);
1056 return inflate(stream, 0);
1057 }
1058
726f852b
NP
1059
1060 /*
1061 * There used to be a second loose object header format which
1062 * was meant to mimic the in-pack format, allowing for direct
1063 * copy of the object data. This format turned up not to be
1064 * really worth it and we don't write it any longer. But we
1065 * can still read it.
1066 */
ad1ed5ee
JH
1067 used = unpack_object_header_gently(map, mapsize, &type, &size);
1068 if (!used || !valid_loose_object_type[type])
93821bd9 1069 return -1;
ad1ed5ee
JH
1070 map += used;
1071 mapsize -= used;
93821bd9
LT
1072
1073 /* Set up the stream for the rest.. */
1074 stream->next_in = map;
1075 stream->avail_in = mapsize;
c4483576 1076 inflateInit(stream);
93821bd9
LT
1077
1078 /* And generate the fake traditional header */
ad1ed5ee 1079 stream->total_out = 1 + snprintf(buffer, bufsiz, "%s %lu",
df843662 1080 typename(type), size);
93821bd9 1081 return 0;
c4483576
LT
1082}
1083
7efbff75 1084static void *unpack_sha1_rest(z_stream *stream, void *buffer, unsigned long size, const unsigned char *sha1)
5180cacc
LT
1085{
1086 int bytes = strlen(buffer) + 1;
d565b341 1087 unsigned char *buf = xmalloc(1+size);
93821bd9 1088 unsigned long n;
7efbff75 1089 int status = Z_OK;
5180cacc 1090
93821bd9
LT
1091 n = stream->total_out - bytes;
1092 if (n > size)
1093 n = size;
1094 memcpy(buf, (char *) buffer + bytes, n);
1095 bytes = n;
456cdf6e
LT
1096 if (bytes <= size) {
1097 /*
1098 * The above condition must be (bytes <= size), not
1099 * (bytes < size). In other words, even though we
1100 * expect no more output and set avail_out to zer0,
1101 * the input zlib stream may have bytes that express
1102 * "this concludes the stream", and we *do* want to
1103 * eat that input.
1104 *
1105 * Otherwise we would not be able to test that we
1106 * consumed all the input to reach the expected size;
1107 * we also want to check that zlib tells us that all
1108 * went well with status == Z_STREAM_END at the end.
1109 */
5180cacc
LT
1110 stream->next_out = buf + bytes;
1111 stream->avail_out = size - bytes;
7efbff75
JH
1112 while (status == Z_OK)
1113 status = inflate(stream, Z_FINISH);
5180cacc
LT
1114 }
1115 buf[size] = 0;
456cdf6e 1116 if (status == Z_STREAM_END && !stream->avail_in) {
7efbff75
JH
1117 inflateEnd(stream);
1118 return buf;
1119 }
1120
1121 if (status < 0)
1122 error("corrupt loose object '%s'", sha1_to_hex(sha1));
1123 else if (stream->avail_in)
1124 error("garbage at end of loose object '%s'",
1125 sha1_to_hex(sha1));
1126 free(buf);
1127 return NULL;
5180cacc
LT
1128}
1129
1130/*
1131 * We used to just use "sscanf()", but that's actually way
1132 * too permissive for what we want to check. So do an anal
1133 * object header parse by hand.
1134 */
21666f1a 1135static int parse_sha1_header(const char *hdr, unsigned long *sizep)
5180cacc 1136{
21666f1a 1137 char type[10];
5180cacc
LT
1138 int i;
1139 unsigned long size;
1140
1141 /*
a6080a0a 1142 * The type can be at most ten bytes (including the
5180cacc 1143 * terminating '\0' that we add), and is followed by
21666f1a 1144 * a space.
5180cacc 1145 */
21666f1a 1146 i = 0;
5180cacc
LT
1147 for (;;) {
1148 char c = *hdr++;
1149 if (c == ' ')
1150 break;
21666f1a
NP
1151 type[i++] = c;
1152 if (i >= sizeof(type))
5180cacc 1153 return -1;
5180cacc 1154 }
21666f1a 1155 type[i] = 0;
5180cacc
LT
1156
1157 /*
1158 * The length must follow immediately, and be in canonical
1159 * decimal format (ie "010" is not valid).
1160 */
1161 size = *hdr++ - '0';
1162 if (size > 9)
1163 return -1;
1164 if (size) {
1165 for (;;) {
1166 unsigned long c = *hdr - '0';
1167 if (c > 9)
1168 break;
1169 hdr++;
1170 size = size * 10 + c;
1171 }
1172 }
1173 *sizep = size;
1174
1175 /*
1176 * The length must be followed by a zero byte
1177 */
21666f1a 1178 return *hdr ? -1 : type_from_string(type);
5180cacc
LT
1179}
1180
7efbff75 1181static void *unpack_sha1_file(void *map, unsigned long mapsize, enum object_type *type, unsigned long *size, const unsigned char *sha1)
0fcfd160 1182{
5180cacc 1183 int ret;
0fcfd160 1184 z_stream stream;
5180cacc 1185 char hdr[8192];
0fcfd160 1186
5180cacc 1187 ret = unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr));
21666f1a 1188 if (ret < Z_OK || (*type = parse_sha1_header(hdr, size)) < 0)
0fcfd160
LT
1189 return NULL;
1190
7efbff75 1191 return unpack_sha1_rest(&stream, hdr, *size, sha1);
0fcfd160
LT
1192}
1193
54dab52a
NP
1194unsigned long get_size_from_delta(struct packed_git *p,
1195 struct pack_window **w_curs,
1196 off_t curpos)
1197{
1198 const unsigned char *data;
1199 unsigned char delta_head[20], *in;
1200 z_stream stream;
1201 int st;
1202
1203 memset(&stream, 0, sizeof(stream));
1204 stream.next_out = delta_head;
1205 stream.avail_out = sizeof(delta_head);
1206
1207 inflateInit(&stream);
1208 do {
1209 in = use_pack(p, w_curs, curpos, &stream.avail_in);
1210 stream.next_in = in;
1211 st = inflate(&stream, Z_FINISH);
1212 curpos += stream.next_in - in;
1213 } while ((st == Z_OK || st == Z_BUF_ERROR) &&
1214 stream.total_out < sizeof(delta_head));
1215 inflateEnd(&stream);
1216 if ((st != Z_STREAM_END) && stream.total_out != sizeof(delta_head))
1217 die("delta data unpack-initial failed");
1218
1219 /* Examine the initial part of the delta to figure out
1220 * the result size.
1221 */
1222 data = delta_head;
1223
1224 /* ignore base size */
1225 get_delta_hdr_size(&data, delta_head+sizeof(delta_head));
1226
1227 /* Read the result size */
1228 return get_delta_hdr_size(&data, delta_head+sizeof(delta_head));
1229}
1230
c4001d92 1231static off_t get_delta_base(struct packed_git *p,
03e79c88 1232 struct pack_window **w_curs,
c4001d92 1233 off_t *curpos,
21666f1a 1234 enum object_type type,
c4001d92 1235 off_t delta_obj_offset)
eb32d236 1236{
2b87c45b 1237 unsigned char *base_info = use_pack(p, w_curs, *curpos, NULL);
c4001d92 1238 off_t base_offset;
eb32d236 1239
8d8a4ea5
SP
1240 /* use_pack() assured us we have [base_info, base_info + 20)
1241 * as a range that we can look at without walking off the
1242 * end of the mapped window. Its actually the hash size
1243 * that is assured. An OFS_DELTA longer than the hash size
1244 * is stupid, as then a REF_DELTA would be smaller to store.
1245 */
21666f1a 1246 if (type == OBJ_OFS_DELTA) {
eb32d236
NP
1247 unsigned used = 0;
1248 unsigned char c = base_info[used++];
1249 base_offset = c & 127;
1250 while (c & 128) {
1251 base_offset += 1;
8723f216 1252 if (!base_offset || MSB(base_offset, 7))
eb32d236
NP
1253 die("offset value overflow for delta base object");
1254 c = base_info[used++];
1255 base_offset = (base_offset << 7) + (c & 127);
1256 }
1257 base_offset = delta_obj_offset - base_offset;
1258 if (base_offset >= delta_obj_offset)
1259 die("delta base offset out of bound");
2b87c45b 1260 *curpos += used;
21666f1a 1261 } else if (type == OBJ_REF_DELTA) {
eb32d236
NP
1262 /* The base entry _must_ be in the same pack */
1263 base_offset = find_pack_entry_one(base_info, p);
1264 if (!base_offset)
1265 die("failed to find delta-pack base object %s",
1266 sha1_to_hex(base_info));
2b87c45b 1267 *curpos += 20;
eb32d236
NP
1268 } else
1269 die("I am totally screwed");
2b87c45b 1270 return base_offset;
eb32d236
NP
1271}
1272
f3bf9224 1273/* forward declaration for a mutually recursive function */
c4001d92 1274static int packed_object_info(struct packed_git *p, off_t offset,
21666f1a 1275 unsigned long *sizep);
f3bf9224 1276
43057304 1277static int packed_delta_info(struct packed_git *p,
03e79c88 1278 struct pack_window **w_curs,
c4001d92 1279 off_t curpos,
21666f1a 1280 enum object_type type,
c4001d92 1281 off_t obj_offset,
43057304 1282 unsigned long *sizep)
5db47c2b 1283{
c4001d92 1284 off_t base_offset;
f3bf9224 1285
21666f1a
NP
1286 base_offset = get_delta_base(p, w_curs, &curpos, type, obj_offset);
1287 type = packed_object_info(p, base_offset, NULL);
f3bf9224 1288
c62266f3
JH
1289 /* We choose to only get the type of the base object and
1290 * ignore potentially corrupt pack file that expects the delta
1291 * based on a base with a wrong size. This saves tons of
1292 * inflate() calls.
1293 */
54dab52a
NP
1294 if (sizep)
1295 *sizep = get_size_from_delta(p, w_curs, curpos);
21666f1a
NP
1296
1297 return type;
5db47c2b
JH
1298}
1299
2b87c45b
NP
1300static int unpack_object_header(struct packed_git *p,
1301 struct pack_window **w_curs,
c4001d92 1302 off_t *curpos,
2b87c45b 1303 unsigned long *sizep)
a733cb60 1304{
03e79c88
SP
1305 unsigned char *base;
1306 unsigned int left;
ad1ed5ee 1307 unsigned long used;
2b87c45b 1308 enum object_type type;
a733cb60 1309
8d8a4ea5
SP
1310 /* use_pack() assures us we have [base, base + 20) available
1311 * as a range that we can look at at. (Its actually the hash
3dff5379 1312 * size that is assured.) With our object header encoding
8d8a4ea5
SP
1313 * the maximum deflated object size is 2^137, which is just
1314 * insane, so we know won't exceed what we have been given.
1315 */
2b87c45b
NP
1316 base = use_pack(p, w_curs, *curpos, &left);
1317 used = unpack_object_header_gently(base, left, &type, sizep);
ad1ed5ee
JH
1318 if (!used)
1319 die("object offset outside of pack file");
2b87c45b 1320 *curpos += used;
ad1ed5ee 1321
2b87c45b 1322 return type;
a733cb60
LT
1323}
1324
21666f1a 1325const char *packed_object_info_detail(struct packed_git *p,
c4001d92 1326 off_t obj_offset,
21666f1a
NP
1327 unsigned long *size,
1328 unsigned long *store_size,
1329 unsigned int *delta_chain_length,
1330 unsigned char *base_sha1)
ad8c80a5 1331{
03e79c88 1332 struct pack_window *w_curs = NULL;
c4001d92
SP
1333 off_t curpos;
1334 unsigned long dummy;
43057304 1335 unsigned char *next_sha1;
21666f1a 1336 enum object_type type;
ad8c80a5 1337
43057304 1338 *delta_chain_length = 0;
2b87c45b 1339 curpos = obj_offset;
21666f1a 1340 type = unpack_object_header(p, &w_curs, &curpos, size);
43057304
NP
1341
1342 for (;;) {
21666f1a 1343 switch (type) {
43057304 1344 default:
08a19d87 1345 die("pack %s contains unknown object type %d",
21666f1a 1346 p->pack_name, type);
43057304
NP
1347 case OBJ_COMMIT:
1348 case OBJ_TREE:
1349 case OBJ_BLOB:
1350 case OBJ_TAG:
43057304 1351 *store_size = 0; /* notyet */
03e79c88 1352 unuse_pack(&w_curs);
21666f1a 1353 return typename(type);
eb32d236 1354 case OBJ_OFS_DELTA:
21666f1a 1355 obj_offset = get_delta_base(p, &w_curs, &curpos, type, obj_offset);
eb32d236 1356 if (*delta_chain_length == 0) {
2b87c45b 1357 /* TODO: find base_sha1 as pointed by curpos */
30fee062 1358 hashclr(base_sha1);
eb32d236
NP
1359 }
1360 break;
1361 case OBJ_REF_DELTA:
2b87c45b 1362 next_sha1 = use_pack(p, &w_curs, curpos, NULL);
43057304
NP
1363 if (*delta_chain_length == 0)
1364 hashcpy(base_sha1, next_sha1);
2b87c45b 1365 obj_offset = find_pack_entry_one(next_sha1, p);
43057304
NP
1366 break;
1367 }
43057304 1368 (*delta_chain_length)++;
2b87c45b 1369 curpos = obj_offset;
21666f1a 1370 type = unpack_object_header(p, &w_curs, &curpos, &dummy);
ad8c80a5 1371 }
ad8c80a5
JH
1372}
1373
c4001d92 1374static int packed_object_info(struct packed_git *p, off_t obj_offset,
21666f1a 1375 unsigned long *sizep)
1f688557 1376{
03e79c88 1377 struct pack_window *w_curs = NULL;
c4001d92
SP
1378 unsigned long size;
1379 off_t curpos = obj_offset;
21666f1a 1380 enum object_type type;
5db47c2b 1381
21666f1a 1382 type = unpack_object_header(p, &w_curs, &curpos, &size);
5db47c2b 1383
21666f1a 1384 switch (type) {
eb32d236
NP
1385 case OBJ_OFS_DELTA:
1386 case OBJ_REF_DELTA:
21666f1a
NP
1387 type = packed_delta_info(p, &w_curs, curpos,
1388 type, obj_offset, sizep);
2b87c45b 1389 break;
a733cb60 1390 case OBJ_COMMIT:
a733cb60 1391 case OBJ_TREE:
a733cb60 1392 case OBJ_BLOB:
a733cb60 1393 case OBJ_TAG:
2b87c45b
NP
1394 if (sizep)
1395 *sizep = size;
a69d0943 1396 break;
1f688557 1397 default:
08a19d87 1398 die("pack %s contains unknown object type %d",
21666f1a 1399 p->pack_name, type);
1f688557 1400 }
2b87c45b 1401 unuse_pack(&w_curs);
21666f1a 1402 return type;
1f688557
JH
1403}
1404
eb950c19 1405static void *unpack_compressed_entry(struct packed_git *p,
03e79c88 1406 struct pack_window **w_curs,
c4001d92 1407 off_t curpos,
eb950c19 1408 unsigned long size)
de530aaa
SP
1409{
1410 int st;
1411 z_stream stream;
079afb18 1412 unsigned char *buffer, *in;
de530aaa
SP
1413
1414 buffer = xmalloc(size + 1);
1415 buffer[size] = 0;
1416 memset(&stream, 0, sizeof(stream));
de530aaa
SP
1417 stream.next_out = buffer;
1418 stream.avail_out = size;
1419
1420 inflateInit(&stream);
079afb18 1421 do {
2b87c45b 1422 in = use_pack(p, w_curs, curpos, &stream.avail_in);
079afb18
SP
1423 stream.next_in = in;
1424 st = inflate(&stream, Z_FINISH);
2b87c45b 1425 curpos += stream.next_in - in;
079afb18 1426 } while (st == Z_OK || st == Z_BUF_ERROR);
de530aaa
SP
1427 inflateEnd(&stream);
1428 if ((st != Z_STREAM_END) || stream.total_out != size) {
1429 free(buffer);
1430 return NULL;
1431 }
1432
1433 return buffer;
1434}
1435
e5e01619
LT
1436#define MAX_DELTA_CACHE (256)
1437
18bdec11 1438static size_t delta_base_cached;
5e08ecbf
NP
1439
1440static struct delta_base_cache_lru_list {
1441 struct delta_base_cache_lru_list *prev;
1442 struct delta_base_cache_lru_list *next;
1443} delta_base_cache_lru = { &delta_base_cache_lru, &delta_base_cache_lru };
1444
e5e01619 1445static struct delta_base_cache_entry {
5e08ecbf
NP
1446 struct delta_base_cache_lru_list lru;
1447 void *data;
e5e01619
LT
1448 struct packed_git *p;
1449 off_t base_offset;
1450 unsigned long size;
e5e01619
LT
1451 enum object_type type;
1452} delta_base_cache[MAX_DELTA_CACHE];
1453
1454static unsigned long pack_entry_hash(struct packed_git *p, off_t base_offset)
1455{
1456 unsigned long hash;
1457
1458 hash = (unsigned long)p + (unsigned long)base_offset;
1459 hash += (hash >> 8) + (hash >> 16);
3358004a 1460 return hash % MAX_DELTA_CACHE;
e5e01619
LT
1461}
1462
62f255ad 1463static void *cache_or_unpack_entry(struct packed_git *p, off_t base_offset,
a0cba108 1464 unsigned long *base_size, enum object_type *type, int keep_cache)
62f255ad 1465{
e5e01619
LT
1466 void *ret;
1467 unsigned long hash = pack_entry_hash(p, base_offset);
1468 struct delta_base_cache_entry *ent = delta_base_cache + hash;
1469
1470 ret = ent->data;
1471 if (ret && ent->p == p && ent->base_offset == base_offset)
1472 goto found_cache_entry;
62f255ad 1473 return unpack_entry(p, base_offset, type, base_size);
e5e01619
LT
1474
1475found_cache_entry:
18bdec11 1476 if (!keep_cache) {
a0cba108 1477 ent->data = NULL;
5e08ecbf
NP
1478 ent->lru.next->prev = ent->lru.prev;
1479 ent->lru.prev->next = ent->lru.next;
18bdec11
SP
1480 delta_base_cached -= ent->size;
1481 }
a0cba108
NP
1482 else {
1483 ret = xmalloc(ent->size + 1);
1484 memcpy(ret, ent->data, ent->size);
1485 ((char *)ret)[ent->size] = 0;
1486 }
e5e01619
LT
1487 *type = ent->type;
1488 *base_size = ent->size;
1489 return ret;
62f255ad
LT
1490}
1491
18bdec11
SP
1492static inline void release_delta_base_cache(struct delta_base_cache_entry *ent)
1493{
1494 if (ent->data) {
1495 free(ent->data);
1496 ent->data = NULL;
5e08ecbf
NP
1497 ent->lru.next->prev = ent->lru.prev;
1498 ent->lru.prev->next = ent->lru.next;
18bdec11
SP
1499 delta_base_cached -= ent->size;
1500 }
1501}
1502
62f255ad
LT
1503static void add_delta_base_cache(struct packed_git *p, off_t base_offset,
1504 void *base, unsigned long base_size, enum object_type type)
1505{
5e08ecbf 1506 unsigned long hash = pack_entry_hash(p, base_offset);
e5e01619 1507 struct delta_base_cache_entry *ent = delta_base_cache + hash;
5e08ecbf 1508 struct delta_base_cache_lru_list *lru;
e5e01619 1509
18bdec11
SP
1510 release_delta_base_cache(ent);
1511 delta_base_cached += base_size;
5e08ecbf
NP
1512
1513 for (lru = delta_base_cache_lru.next;
1514 delta_base_cached > delta_base_cache_limit
1515 && lru != &delta_base_cache_lru;
1516 lru = lru->next) {
1517 struct delta_base_cache_entry *f = (void *)lru;
18bdec11
SP
1518 if (f->type == OBJ_BLOB)
1519 release_delta_base_cache(f);
1520 }
5e08ecbf
NP
1521 for (lru = delta_base_cache_lru.next;
1522 delta_base_cached > delta_base_cache_limit
1523 && lru != &delta_base_cache_lru;
1524 lru = lru->next) {
1525 struct delta_base_cache_entry *f = (void *)lru;
1526 release_delta_base_cache(f);
1527 }
18bdec11 1528
e5e01619
LT
1529 ent->p = p;
1530 ent->base_offset = base_offset;
1531 ent->type = type;
1532 ent->data = base;
1533 ent->size = base_size;
5e08ecbf
NP
1534 ent->lru.next = &delta_base_cache_lru;
1535 ent->lru.prev = delta_base_cache_lru.prev;
1536 delta_base_cache_lru.prev->next = &ent->lru;
1537 delta_base_cache_lru.prev = &ent->lru;
62f255ad
LT
1538}
1539
eb950c19 1540static void *unpack_delta_entry(struct packed_git *p,
03e79c88 1541 struct pack_window **w_curs,
c4001d92 1542 off_t curpos,
1f688557 1543 unsigned long delta_size,
c4001d92 1544 off_t obj_offset,
21666f1a 1545 enum object_type *type,
eb950c19 1546 unsigned long *sizep)
1f688557 1547{
7c3e8be3 1548 void *delta_data, *result, *base;
c4001d92
SP
1549 unsigned long base_size;
1550 off_t base_offset;
43057304 1551
21666f1a 1552 base_offset = get_delta_base(p, w_curs, &curpos, *type, obj_offset);
a0cba108 1553 base = cache_or_unpack_entry(p, base_offset, &base_size, type, 0);
67686d95 1554 if (!base)
c4001d92
SP
1555 die("failed to read delta base object"
1556 " at %"PRIuMAX" from %s",
1557 (uintmax_t)base_offset, p->pack_name);
67686d95 1558
2b87c45b 1559 delta_data = unpack_compressed_entry(p, w_curs, curpos, delta_size);
1f688557
JH
1560 result = patch_delta(base, base_size,
1561 delta_data, delta_size,
21666f1a 1562 sizep);
1f688557
JH
1563 if (!result)
1564 die("failed to apply delta");
1565 free(delta_data);
62f255ad 1566 add_delta_base_cache(p, base_offset, base, base_size, *type);
1f688557
JH
1567 return result;
1568}
1569
c4001d92 1570void *unpack_entry(struct packed_git *p, off_t obj_offset,
21666f1a 1571 enum object_type *type, unsigned long *sizep)
1f688557 1572{
03e79c88 1573 struct pack_window *w_curs = NULL;
c4001d92 1574 off_t curpos = obj_offset;
21666f1a 1575 void *data;
1f688557 1576
21666f1a
NP
1577 *type = unpack_object_header(p, &w_curs, &curpos, sizep);
1578 switch (*type) {
eb32d236
NP
1579 case OBJ_OFS_DELTA:
1580 case OBJ_REF_DELTA:
21666f1a
NP
1581 data = unpack_delta_entry(p, &w_curs, curpos, *sizep,
1582 obj_offset, type, sizep);
4d703a1a 1583 break;
a733cb60 1584 case OBJ_COMMIT:
a733cb60 1585 case OBJ_TREE:
a733cb60 1586 case OBJ_BLOB:
a733cb60 1587 case OBJ_TAG:
21666f1a 1588 data = unpack_compressed_entry(p, &w_curs, curpos, *sizep);
4d703a1a 1589 break;
1f688557 1590 default:
21666f1a 1591 die("unknown object type %i in %s", *type, p->pack_name);
1f688557 1592 }
03e79c88 1593 unuse_pack(&w_curs);
21666f1a 1594 return data;
1f688557
JH
1595}
1596
d079837e 1597const unsigned char *nth_packed_object_sha1(struct packed_git *p,
d72308e0 1598 uint32_t n)
9a217f2a 1599{
42873078 1600 const unsigned char *index = p->index_data;
d079837e
SP
1601 if (!index) {
1602 if (open_pack_index(p))
1603 return NULL;
1604 index = p->index_data;
1605 }
57059091 1606 if (n >= p->num_objects)
d72308e0 1607 return NULL;
74e34e1f
NP
1608 index += 4 * 256;
1609 if (p->index_version == 1) {
1610 return index + 24 * n + 4;
1611 } else {
1612 index += 8;
1613 return index + 20 * n;
1614 }
1615}
1616
1617static off_t nth_packed_object_offset(const struct packed_git *p, uint32_t n)
1618{
1619 const unsigned char *index = p->index_data;
1620 index += 4 * 256;
1621 if (p->index_version == 1) {
1622 return ntohl(*((uint32_t *)(index + 24 * n)));
1623 } else {
1624 uint32_t off;
1625 index += 8 + p->num_objects * (20 + 4);
1626 off = ntohl(*((uint32_t *)(index + 4 * n)));
1627 if (!(off & 0x80000000))
1628 return off;
1629 index += p->num_objects * 4 + (off & 0x7fffffff) * 8;
1630 return (((uint64_t)ntohl(*((uint32_t *)(index + 0)))) << 32) |
1631 ntohl(*((uint32_t *)(index + 4)));
1632 }
9a217f2a
JH
1633}
1634
c4001d92 1635off_t find_pack_entry_one(const unsigned char *sha1,
43057304 1636 struct packed_git *p)
1f688557 1637{
42873078 1638 const uint32_t *level1_ofs = p->index_data;
42873078 1639 const unsigned char *index = p->index_data;
74e34e1f 1640 unsigned hi, lo;
42873078 1641
d079837e
SP
1642 if (!index) {
1643 if (open_pack_index(p))
1644 return 0;
1645 level1_ofs = p->index_data;
1646 index = p->index_data;
1647 }
74e34e1f
NP
1648 if (p->index_version > 1) {
1649 level1_ofs += 2;
1650 index += 8;
1651 }
42873078 1652 index += 4 * 256;
74e34e1f
NP
1653 hi = ntohl(level1_ofs[*sha1]);
1654 lo = ((*sha1 == 0x0) ? 0 : ntohl(level1_ofs[*sha1 - 1]));
1f688557
JH
1655
1656 do {
74e34e1f
NP
1657 unsigned mi = (lo + hi) / 2;
1658 unsigned x = (p->index_version > 1) ? (mi * 20) : (mi * 24 + 4);
1659 int cmp = hashcmp(index + x, sha1);
43057304 1660 if (!cmp)
74e34e1f 1661 return nth_packed_object_offset(p, mi);
1f688557
JH
1662 if (cmp > 0)
1663 hi = mi;
1664 else
1665 lo = mi+1;
1666 } while (lo < hi);
1667 return 0;
1668}
1669
d4ff6d92
SP
1670static int matches_pack_name(struct packed_git *p, const char *ig)
1671{
1672 const char *last_c, *c;
1673
1674 if (!strcmp(p->pack_name, ig))
1675 return 0;
1676
1677 for (c = p->pack_name, last_c = c; *c;)
1678 if (*c == '/')
1679 last_c = ++c;
1680 else
1681 ++c;
1682 if (!strcmp(last_c, ig))
1683 return 0;
1684
1685 return 1;
1686}
1687
106d710b 1688static int find_pack_entry(const unsigned char *sha1, struct pack_entry *e, const char **ignore_packed)
1f688557 1689{
f7c22cc6 1690 static struct packed_git *last_found = (void *)1;
1f688557 1691 struct packed_git *p;
c4001d92 1692 off_t offset;
43057304 1693
1f688557 1694 prepare_packed_git();
f7c22cc6
NP
1695 if (!packed_git)
1696 return 0;
1697 p = (last_found == (void *)1) ? packed_git : last_found;
1f688557 1698
f7c22cc6 1699 do {
106d710b
JH
1700 if (ignore_packed) {
1701 const char **ig;
1702 for (ig = ignore_packed; *ig; ig++)
d4ff6d92 1703 if (!matches_pack_name(p, *ig))
106d710b
JH
1704 break;
1705 if (*ig)
f7c22cc6 1706 goto next;
106d710b 1707 }
f7c22cc6 1708
43057304
NP
1709 offset = find_pack_entry_one(sha1, p);
1710 if (offset) {
c715f783
SP
1711 /*
1712 * We are about to tell the caller where they can
1713 * locate the requested object. We better make
1714 * sure the packfile is still here and can be
1715 * accessed before supplying that answer, as
1716 * it may have been deleted since the index
1717 * was loaded!
1718 */
1719 if (p->pack_fd == -1 && open_packed_git(p)) {
1720 error("packfile %s cannot be accessed", p->pack_name);
f7c22cc6 1721 goto next;
c715f783 1722 }
43057304
NP
1723 e->offset = offset;
1724 e->p = p;
1725 hashcpy(e->sha1, sha1);
f7c22cc6 1726 last_found = p;
1f688557 1727 return 1;
43057304 1728 }
f7c22cc6
NP
1729
1730 next:
1731 if (p == last_found)
1732 p = packed_git;
1733 else
1734 p = p->next;
1735 if (p == last_found)
1736 p = p->next;
1737 } while (p);
1f688557
JH
1738 return 0;
1739}
1740
a6080a0a 1741struct packed_git *find_sha1_pack(const unsigned char *sha1,
bf592c50
DB
1742 struct packed_git *packs)
1743{
1744 struct packed_git *p;
bf592c50
DB
1745
1746 for (p = packs; p; p = p->next) {
43057304 1747 if (find_pack_entry_one(sha1, p))
bf592c50
DB
1748 return p;
1749 }
1750 return NULL;
21666f1a 1751
bf592c50
DB
1752}
1753
21666f1a 1754static int sha1_loose_object_info(const unsigned char *sha1, unsigned long *sizep)
65c2e0c3 1755{
36e4d74a 1756 int status;
65c2e0c3
JH
1757 unsigned long mapsize, size;
1758 void *map;
1759 z_stream stream;
d65a16f6 1760 char hdr[32];
65c2e0c3 1761
bb6b8e4f 1762 map = map_sha1_file(sha1, &mapsize);
f0df4ed5
JS
1763 if (!map)
1764 return error("unable to find %s", sha1_to_hex(sha1));
36e4d74a
JH
1765 if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0)
1766 status = error("unable to unpack %s header",
1767 sha1_to_hex(sha1));
21666f1a 1768 else if ((status = parse_sha1_header(hdr, &size)) < 0)
36e4d74a 1769 status = error("unable to parse %s header", sha1_to_hex(sha1));
21666f1a
NP
1770 else if (sizep)
1771 *sizep = size;
65c2e0c3
JH
1772 inflateEnd(&stream);
1773 munmap(map, mapsize);
1774 return status;
1775}
1776
21666f1a 1777int sha1_object_info(const unsigned char *sha1, unsigned long *sizep)
f0df4ed5 1778{
f0df4ed5
JS
1779 struct pack_entry e;
1780
1781 if (!find_pack_entry(sha1, &e, NULL)) {
1782 reprepare_packed_git();
1783 if (!find_pack_entry(sha1, &e, NULL))
21666f1a 1784 return sha1_loose_object_info(sha1, sizep);
f0df4ed5 1785 }
21666f1a 1786 return packed_object_info(e.p, e.offset, sizep);
f0df4ed5
JS
1787}
1788
21666f1a
NP
1789static void *read_packed_sha1(const unsigned char *sha1,
1790 enum object_type *type, unsigned long *size)
1f688557
JH
1791{
1792 struct pack_entry e;
1793
8276c007 1794 if (!find_pack_entry(sha1, &e, NULL))
1f688557 1795 return NULL;
8276c007 1796 else
a0cba108 1797 return cache_or_unpack_entry(e.p, e.offset, size, type, 1);
1f688557
JH
1798}
1799
d66b37bb
JH
1800/*
1801 * This is meant to hold a *small* number of objects that you would
1802 * want read_sha1_file() to be able to return, but yet you do not want
1803 * to write them into the object store (e.g. a browse-only
1804 * application).
1805 */
1806static struct cached_object {
1807 unsigned char sha1[20];
21666f1a 1808 enum object_type type;
d66b37bb
JH
1809 void *buf;
1810 unsigned long size;
1811} *cached_objects;
1812static int cached_object_nr, cached_object_alloc;
1813
1814static struct cached_object *find_cached_object(const unsigned char *sha1)
1815{
1816 int i;
1817 struct cached_object *co = cached_objects;
1818
1819 for (i = 0; i < cached_object_nr; i++, co++) {
1820 if (!hashcmp(co->sha1, sha1))
1821 return co;
1822 }
1823 return NULL;
1824}
1825
21666f1a
NP
1826int pretend_sha1_file(void *buf, unsigned long len, enum object_type type,
1827 unsigned char *sha1)
d66b37bb
JH
1828{
1829 struct cached_object *co;
1830
21666f1a 1831 hash_sha1_file(buf, len, typename(type), sha1);
d66b37bb
JH
1832 if (has_sha1_file(sha1) || find_cached_object(sha1))
1833 return 0;
1834 if (cached_object_alloc <= cached_object_nr) {
1835 cached_object_alloc = alloc_nr(cached_object_alloc);
1836 cached_objects = xrealloc(cached_objects,
1837 sizeof(*cached_objects) *
1838 cached_object_alloc);
1839 }
1840 co = &cached_objects[cached_object_nr++];
1841 co->size = len;
21666f1a 1842 co->type = type;
efa13f7b
JH
1843 co->buf = xmalloc(len);
1844 memcpy(co->buf, buf, len);
d66b37bb
JH
1845 hashcpy(co->sha1, sha1);
1846 return 0;
1847}
1848
21666f1a
NP
1849void *read_sha1_file(const unsigned char *sha1, enum object_type *type,
1850 unsigned long *size)
0fcfd160
LT
1851{
1852 unsigned long mapsize;
1853 void *map, *buf;
d66b37bb
JH
1854 struct cached_object *co;
1855
1856 co = find_cached_object(sha1);
1857 if (co) {
1858 buf = xmalloc(co->size + 1);
1859 memcpy(buf, co->buf, co->size);
1860 ((char*)buf)[co->size] = 0;
21666f1a 1861 *type = co->type;
d66b37bb
JH
1862 *size = co->size;
1863 return buf;
1864 }
0fcfd160 1865
8276c007
PE
1866 buf = read_packed_sha1(sha1, type, size);
1867 if (buf)
1868 return buf;
bb6b8e4f 1869 map = map_sha1_file(sha1, &mapsize);
0fcfd160 1870 if (map) {
7efbff75 1871 buf = unpack_sha1_file(map, mapsize, type, size, sha1);
0fcfd160
LT
1872 munmap(map, mapsize);
1873 return buf;
1874 }
637cdd9d 1875 reprepare_packed_git();
8276c007 1876 return read_packed_sha1(sha1, type, size);
0fcfd160
LT
1877}
1878
40469ee9 1879void *read_object_with_reference(const unsigned char *sha1,
21666f1a 1880 const char *required_type_name,
40469ee9
JH
1881 unsigned long *size,
1882 unsigned char *actual_sha1_return)
f4913f91 1883{
21666f1a 1884 enum object_type type, required_type;
f4913f91
JH
1885 void *buffer;
1886 unsigned long isize;
40469ee9 1887 unsigned char actual_sha1[20];
f4913f91 1888
21666f1a 1889 required_type = type_from_string(required_type_name);
e702496e 1890 hashcpy(actual_sha1, sha1);
40469ee9
JH
1891 while (1) {
1892 int ref_length = -1;
1893 const char *ref_type = NULL;
f4913f91 1894
21666f1a 1895 buffer = read_sha1_file(actual_sha1, &type, &isize);
40469ee9
JH
1896 if (!buffer)
1897 return NULL;
21666f1a 1898 if (type == required_type) {
40469ee9
JH
1899 *size = isize;
1900 if (actual_sha1_return)
e702496e 1901 hashcpy(actual_sha1_return, actual_sha1);
40469ee9
JH
1902 return buffer;
1903 }
1904 /* Handle references */
21666f1a 1905 else if (type == OBJ_COMMIT)
40469ee9 1906 ref_type = "tree ";
21666f1a 1907 else if (type == OBJ_TAG)
40469ee9
JH
1908 ref_type = "object ";
1909 else {
1910 free(buffer);
1911 return NULL;
1912 }
1913 ref_length = strlen(ref_type);
f4913f91 1914
40469ee9 1915 if (memcmp(buffer, ref_type, ref_length) ||
1d7f171c 1916 get_sha1_hex((char *) buffer + ref_length, actual_sha1)) {
40469ee9
JH
1917 free(buffer);
1918 return NULL;
1919 }
1cf58e72 1920 free(buffer);
40469ee9
JH
1921 /* Now we have the ID of the referred-to object in
1922 * actual_sha1. Check again. */
f4913f91 1923 }
f4913f91
JH
1924}
1925
ce9fbf16 1926static void write_sha1_file_prepare(const void *buf, unsigned long len,
972a9155 1927 const char *type, unsigned char *sha1,
d65a16f6 1928 char *hdr, int *hdrlen)
d410c0f5
JH
1929{
1930 SHA_CTX c;
1931
1932 /* Generate the header */
d65a16f6 1933 *hdrlen = sprintf(hdr, "%s %lu", type, len)+1;
d410c0f5
JH
1934
1935 /* Sha1.. */
1936 SHA1_Init(&c);
1937 SHA1_Update(&c, hdr, *hdrlen);
1938 SHA1_Update(&c, buf, len);
1939 SHA1_Final(sha1, &c);
d410c0f5
JH
1940}
1941
230f1322
LT
1942/*
1943 * Link the tempfile to the final place, possibly creating the
1944 * last directory level as you do so.
1945 *
1946 * Returns the errno on failure, 0 on success.
1947 */
839837b9 1948static int link_temp_to_file(const char *tmpfile, const char *filename)
230f1322
LT
1949{
1950 int ret;
756aaf4a 1951 char *dir;
230f1322
LT
1952
1953 if (!link(tmpfile, filename))
1954 return 0;
1955
1956 /*
756aaf4a 1957 * Try to mkdir the last path component if that failed.
230f1322
LT
1958 *
1959 * Re-try the "link()" regardless of whether the mkdir
1960 * succeeds, since a race might mean that somebody
1961 * else succeeded.
1962 */
1963 ret = errno;
756aaf4a
SP
1964 dir = strrchr(filename, '/');
1965 if (dir) {
1966 *dir = 0;
866cae0d 1967 if (!mkdir(filename, 0777) && adjust_shared_perm(filename)) {
91c23e48 1968 *dir = '/';
756aaf4a 1969 return -2;
91c23e48 1970 }
756aaf4a
SP
1971 *dir = '/';
1972 if (!link(tmpfile, filename))
1973 return 0;
1974 ret = errno;
230f1322
LT
1975 }
1976 return ret;
1977}
1978
1979/*
1980 * Move the just written object into its final resting place
1981 */
839837b9 1982int move_temp_to_file(const char *tmpfile, const char *filename)
230f1322
LT
1983{
1984 int ret = link_temp_to_file(tmpfile, filename);
7ebb6fca
LT
1985
1986 /*
1987 * Coda hack - coda doesn't like cross-directory links,
1988 * so we fall back to a rename, which will mean that it
1989 * won't be able to check collisions, but that's not a
1990 * big deal.
1991 *
1992 * The same holds for FAT formatted media.
1993 *
1994 * When this succeeds, we just return 0. We have nothing
1995 * left to unlink.
1996 */
1997 if (ret && ret != EEXIST) {
1998 if (!rename(tmpfile, filename))
230f1322 1999 return 0;
9e48b389 2000 ret = errno;
230f1322
LT
2001 }
2002 unlink(tmpfile);
2003 if (ret) {
2004 if (ret != EEXIST) {
916d081b 2005 return error("unable to write sha1 filename %s: %s\n", filename, strerror(ret));
230f1322
LT
2006 }
2007 /* FIXME!!! Collision check here ? */
2008 }
2009
2010 return 0;
2011}
2012
4d548150
LT
2013static int write_buffer(int fd, const void *buf, size_t len)
2014{
d34cf19b 2015 if (write_in_full(fd, buf, len) < 0)
93822c22 2016 return error("file write error (%s)", strerror(errno));
4d548150
LT
2017 return 0;
2018}
2019
ce9fbf16 2020int hash_sha1_file(const void *buf, unsigned long len, const char *type,
abdc3fc8
RS
2021 unsigned char *sha1)
2022{
d65a16f6 2023 char hdr[32];
abdc3fc8
RS
2024 int hdrlen;
2025 write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen);
2026 return 0;
2027}
2028
bf0f910d 2029int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *returnsha1)
0fcfd160 2030{
ac54c277 2031 int size, ret;
bf0f910d 2032 unsigned char *compressed;
0fcfd160
LT
2033 z_stream stream;
2034 unsigned char sha1[20];
706bc531 2035 char *filename;
aac17941 2036 static char tmpfile[PATH_MAX];
d65a16f6 2037 char hdr[32];
230f1322 2038 int fd, hdrlen;
a44c9a5e 2039
d410c0f5
JH
2040 /* Normally if we have it in the pack then we do not bother writing
2041 * it out into .git/objects/??/?{38} file.
2042 */
972a9155
RS
2043 write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen);
2044 filename = sha1_file_name(sha1);
706bc531 2045 if (returnsha1)
e702496e 2046 hashcpy(returnsha1, sha1);
d410c0f5
JH
2047 if (has_sha1_file(sha1))
2048 return 0;
aac17941
LT
2049 fd = open(filename, O_RDONLY);
2050 if (fd >= 0) {
706bc531 2051 /*
aac17941
LT
2052 * FIXME!!! We might do collision checking here, but we'd
2053 * need to uncompress the old file and check it. Later.
706bc531 2054 */
aac17941 2055 close(fd);
706bc531
LT
2056 return 0;
2057 }
2058
aac17941 2059 if (errno != ENOENT) {
916d081b 2060 return error("sha1 file %s: %s\n", filename, strerror(errno));
aac17941
LT
2061 }
2062
0e55181f 2063 snprintf(tmpfile, sizeof(tmpfile), "%s/tmp_obj_XXXXXX", get_object_directory());
ace1534d 2064
aac17941
LT
2065 fd = mkstemp(tmpfile);
2066 if (fd < 0) {
916d081b
PB
2067 if (errno == EPERM)
2068 return error("insufficient permission for adding an object to repository database %s\n", get_object_directory());
2069 else
2070 return error("unable to create temporary sha1 filename %s: %s\n", tmpfile, strerror(errno));
aac17941
LT
2071 }
2072
0fcfd160
LT
2073 /* Set it up */
2074 memset(&stream, 0, sizeof(stream));
12f6c308 2075 deflateInit(&stream, zlib_compression_level);
93821bd9 2076 size = 8 + deflateBound(&stream, len+hdrlen);
812666c8 2077 compressed = xmalloc(size);
0fcfd160
LT
2078
2079 /* Compress it */
0fcfd160
LT
2080 stream.next_out = compressed;
2081 stream.avail_out = size;
a44c9a5e
LT
2082
2083 /* First header.. */
d65a16f6 2084 stream.next_in = (unsigned char *)hdr;
a44c9a5e 2085 stream.avail_in = hdrlen;
726f852b
NP
2086 while (deflate(&stream, 0) == Z_OK)
2087 /* nothing */;
a44c9a5e
LT
2088
2089 /* Then the data itself.. */
2090 stream.next_in = buf;
2091 stream.avail_in = len;
ac54c277
LT
2092 ret = deflate(&stream, Z_FINISH);
2093 if (ret != Z_STREAM_END)
2094 die("unable to deflate new object %s (%d)", sha1_to_hex(sha1), ret);
2095
2096 ret = deflateEnd(&stream);
2097 if (ret != Z_OK)
2098 die("deflateEnd on object %s failed (%d)", sha1_to_hex(sha1), ret);
2099
0fcfd160
LT
2100 size = stream.total_out;
2101
4d548150
LT
2102 if (write_buffer(fd, compressed, size) < 0)
2103 die("unable to write sha1 file");
aac17941 2104 fchmod(fd, 0444);
e82973cf
JH
2105 if (close(fd))
2106 die("unable to write sha1 file");
383f85b7 2107 free(compressed);
0fcfd160 2108
230f1322 2109 return move_temp_to_file(tmpfile, filename);
0fcfd160 2110}
8237b185 2111
4d548150
LT
2112/*
2113 * We need to unpack and recompress the object for writing
2114 * it out to a different file.
2115 */
2116static void *repack_object(const unsigned char *sha1, unsigned long *objsize)
a5eda52b 2117{
4d548150 2118 size_t size;
a5eda52b 2119 z_stream stream;
4d548150
LT
2120 unsigned char *unpacked;
2121 unsigned long len;
21666f1a 2122 enum object_type type;
d65a16f6 2123 char hdr[32];
4d548150
LT
2124 int hdrlen;
2125 void *buf;
bfc66daf 2126
a9486b02 2127 /* need to unpack and recompress it by itself */
21666f1a 2128 unpacked = read_packed_sha1(sha1, &type, &len);
8276c007
PE
2129 if (!unpacked)
2130 error("cannot read sha1_file for %s", sha1_to_hex(sha1));
a5eda52b 2131
21666f1a 2132 hdrlen = sprintf(hdr, "%s %lu", typename(type), len) + 1;
a5eda52b 2133
4d548150
LT
2134 /* Set it up */
2135 memset(&stream, 0, sizeof(stream));
12f6c308 2136 deflateInit(&stream, zlib_compression_level);
4d548150
LT
2137 size = deflateBound(&stream, len + hdrlen);
2138 buf = xmalloc(size);
a5eda52b 2139
4d548150
LT
2140 /* Compress it */
2141 stream.next_out = buf;
2142 stream.avail_out = size;
a5eda52b 2143
4d548150
LT
2144 /* First header.. */
2145 stream.next_in = (void *)hdr;
2146 stream.avail_in = hdrlen;
2147 while (deflate(&stream, 0) == Z_OK)
2148 /* nothing */;
bfc66daf 2149
4d548150
LT
2150 /* Then the data itself.. */
2151 stream.next_in = unpacked;
2152 stream.avail_in = len;
2153 while (deflate(&stream, Z_FINISH) == Z_OK)
2154 /* nothing */;
2155 deflateEnd(&stream);
2156 free(unpacked);
bfc66daf 2157
4d548150
LT
2158 *objsize = stream.total_out;
2159 return buf;
2160}
2161
2162int write_sha1_to_fd(int fd, const unsigned char *sha1)
2163{
2164 int retval;
2165 unsigned long objsize;
bb6b8e4f 2166 void *buf = map_sha1_file(sha1, &objsize);
4d548150
LT
2167
2168 if (buf) {
2169 retval = write_buffer(fd, buf, objsize);
2170 munmap(buf, objsize);
2171 return retval;
2172 }
2173
2174 buf = repack_object(sha1, &objsize);
2175 retval = write_buffer(fd, buf, objsize);
2176 free(buf);
2177 return retval;
a5eda52b
DB
2178}
2179
70b9829e
DB
2180int write_sha1_from_fd(const unsigned char *sha1, int fd, char *buffer,
2181 size_t bufsize, size_t *bufposn)
8237b185 2182{
230f1322 2183 char tmpfile[PATH_MAX];
8237b185
DB
2184 int local;
2185 z_stream stream;
2186 unsigned char real_sha1[20];
bf0f910d 2187 unsigned char discard[4096];
8237b185
DB
2188 int ret;
2189 SHA_CTX c;
2190
0e55181f 2191 snprintf(tmpfile, sizeof(tmpfile), "%s/tmp_obj_XXXXXX", get_object_directory());
8237b185 2192
230f1322 2193 local = mkstemp(tmpfile);
916d081b
PB
2194 if (local < 0) {
2195 if (errno == EPERM)
2196 return error("insufficient permission for adding an object to repository database %s\n", get_object_directory());
2197 else
2198 return error("unable to create temporary sha1 filename %s: %s\n", tmpfile, strerror(errno));
2199 }
8237b185
DB
2200
2201 memset(&stream, 0, sizeof(stream));
2202
2203 inflateInit(&stream);
2204
2205 SHA1_Init(&c);
2206
2207 do {
2208 ssize_t size;
70b9829e
DB
2209 if (*bufposn) {
2210 stream.avail_in = *bufposn;
96ad15ae 2211 stream.next_in = (unsigned char *) buffer;
70b9829e
DB
2212 do {
2213 stream.next_out = discard;
2214 stream.avail_out = sizeof(discard);
2215 ret = inflate(&stream, Z_SYNC_FLUSH);
2216 SHA1_Update(&c, discard, sizeof(discard) -
2217 stream.avail_out);
2218 } while (stream.avail_in && ret == Z_OK);
4d548150
LT
2219 if (write_buffer(local, buffer, *bufposn - stream.avail_in) < 0)
2220 die("unable to write sha1 file");
70b9829e
DB
2221 memmove(buffer, buffer + *bufposn - stream.avail_in,
2222 stream.avail_in);
2223 *bufposn = stream.avail_in;
2224 if (ret != Z_OK)
2225 break;
2226 }
93d26e4c 2227 size = xread(fd, buffer + *bufposn, bufsize - *bufposn);
8237b185
DB
2228 if (size <= 0) {
2229 close(local);
230f1322 2230 unlink(tmpfile);
8237b185
DB
2231 if (!size)
2232 return error("Connection closed?");
2233 perror("Reading from connection");
2234 return -1;
2235 }
70b9829e
DB
2236 *bufposn += size;
2237 } while (1);
8237b185
DB
2238 inflateEnd(&stream);
2239
b5b8d814 2240 fchmod(local, 0444);
0d315468
JM
2241 if (close(local) != 0)
2242 die("unable to write sha1 file");
8237b185
DB
2243 SHA1_Final(real_sha1, &c);
2244 if (ret != Z_STREAM_END) {
230f1322 2245 unlink(tmpfile);
8237b185
DB
2246 return error("File %s corrupted", sha1_to_hex(sha1));
2247 }
a89fccd2 2248 if (hashcmp(sha1, real_sha1)) {
230f1322 2249 unlink(tmpfile);
bd2afde8 2250 return error("File %s has bad hash", sha1_to_hex(sha1));
8237b185 2251 }
230f1322
LT
2252
2253 return move_temp_to_file(tmpfile, sha1_file_name(sha1));
8237b185
DB
2254}
2255
bf592c50
DB
2256int has_pack_index(const unsigned char *sha1)
2257{
2258 struct stat st;
2259 if (stat(sha1_pack_index_name(sha1), &st))
2260 return 0;
2261 return 1;
2262}
2263
2264int has_pack_file(const unsigned char *sha1)
2265{
2266 struct stat st;
2267 if (stat(sha1_pack_name(sha1), &st))
2268 return 0;
2269 return 1;
2270}
2271
106d710b 2272int has_sha1_pack(const unsigned char *sha1, const char **ignore_packed)
dade09c2
LT
2273{
2274 struct pack_entry e;
106d710b 2275 return find_pack_entry(sha1, &e, ignore_packed);
dade09c2
LT
2276}
2277
8237b185
DB
2278int has_sha1_file(const unsigned char *sha1)
2279{
8237b185 2280 struct stat st;
1f688557
JH
2281 struct pack_entry e;
2282
106d710b 2283 if (find_pack_entry(sha1, &e, NULL))
1f688557 2284 return 1;
ab90ea5d 2285 return find_sha1_file(sha1, &st) ? 1 : 0;
8237b185 2286}
74400e71 2287
e7332f96
BE
2288/*
2289 * reads from fd as long as possible into a supplied buffer of size bytes.
82e5a82f 2290 * If necessary the buffer's size is increased using realloc()
e7332f96
BE
2291 *
2292 * returns 0 if anything went fine and -1 otherwise
2293 *
2294 * NOTE: both buf and size may change, but even when -1 is returned
2295 * you still have to free() it yourself.
2296 */
2297int read_pipe(int fd, char** return_buf, unsigned long* return_size)
024510c8 2298{
e7332f96
BE
2299 char* buf = *return_buf;
2300 unsigned long size = *return_size;
8a912bcb 2301 ssize_t iret;
024510c8 2302 unsigned long off = 0;
e7332f96 2303
024510c8 2304 do {
e7332f96 2305 iret = xread(fd, buf + off, size - off);
024510c8
DB
2306 if (iret > 0) {
2307 off += iret;
2308 if (off == size) {
2309 size *= 2;
83572c1a 2310 buf = xrealloc(buf, size);
024510c8
DB
2311 }
2312 }
2313 } while (iret > 0);
e7332f96
BE
2314
2315 *return_buf = buf;
2316 *return_size = off;
2317
2318 if (iret < 0)
2319 return -1;
2320 return 0;
2321}
2322
2323int index_pipe(unsigned char *sha1, int fd, const char *type, int write_object)
2324{
2325 unsigned long size = 4096;
2d7320d0 2326 char *buf = xmalloc(size);
e7332f96 2327 int ret;
e7332f96
BE
2328
2329 if (read_pipe(fd, &buf, &size)) {
024510c8
DB
2330 free(buf);
2331 return -1;
2332 }
e7332f96 2333
024510c8 2334 if (!type)
8e440259 2335 type = blob_type;
024510c8 2336 if (write_object)
e7332f96 2337 ret = write_sha1_file(buf, size, type, sha1);
abdc3fc8
RS
2338 else
2339 ret = hash_sha1_file(buf, size, type, sha1);
024510c8
DB
2340 free(buf);
2341 return ret;
2342}
2343
edaec3fb 2344int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object,
53bca91a 2345 enum object_type type, const char *path)
74400e71 2346{
dc49cd76 2347 size_t size = xsize_t(st->st_size);
3a55602e 2348 void *buf = NULL;
6c510bee 2349 int ret, re_allocated = 0;
74400e71 2350
74400e71 2351 if (size)
c4712e45 2352 buf = xmmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0);
74400e71 2353 close(fd);
74400e71 2354
7672db20 2355 if (!type)
edaec3fb 2356 type = OBJ_BLOB;
6c510bee
LT
2357
2358 /*
2359 * Convert blobs to git internal format
2360 */
d0d8e14d 2361 if ((type == OBJ_BLOB) && S_ISREG(st->st_mode)) {
6c510bee 2362 unsigned long nsize = size;
ac78e548
AR
2363 char *nbuf = convert_to_git(path, buf, &nsize);
2364 if (nbuf) {
2365 munmap(buf, size);
6c510bee
LT
2366 size = nsize;
2367 buf = nbuf;
2368 re_allocated = 1;
2369 }
2370 }
2371
7672db20 2372 if (write_object)
edaec3fb 2373 ret = write_sha1_file(buf, size, typename(type), sha1);
abdc3fc8 2374 else
edaec3fb 2375 ret = hash_sha1_file(buf, size, typename(type), sha1);
6c510bee
LT
2376 if (re_allocated) {
2377 free(buf);
2378 return ret;
2379 }
aac17941
LT
2380 if (size)
2381 munmap(buf, size);
2382 return ret;
74400e71 2383}
ec1fcc16
JH
2384
2385int index_path(unsigned char *sha1, const char *path, struct stat *st, int write_object)
2386{
2387 int fd;
2388 char *target;
dc49cd76 2389 size_t len;
ec1fcc16
JH
2390
2391 switch (st->st_mode & S_IFMT) {
2392 case S_IFREG:
2393 fd = open(path, O_RDONLY);
2394 if (fd < 0)
2395 return error("open(\"%s\"): %s", path,
2396 strerror(errno));
53bca91a 2397 if (index_fd(sha1, fd, st, write_object, OBJ_BLOB, path) < 0)
ec1fcc16
JH
2398 return error("%s: failed to insert into database",
2399 path);
2400 break;
2401 case S_IFLNK:
dc49cd76
SP
2402 len = xsize_t(st->st_size);
2403 target = xmalloc(len + 1);
2404 if (readlink(path, target, len + 1) != st->st_size) {
ec1fcc16
JH
2405 char *errstr = strerror(errno);
2406 free(target);
2407 return error("readlink(\"%s\"): %s", path,
2408 errstr);
2409 }
abdc3fc8 2410 if (!write_object)
dc49cd76
SP
2411 hash_sha1_file(target, len, blob_type, sha1);
2412 else if (write_sha1_file(target, len, blob_type, sha1))
ec1fcc16
JH
2413 return error("%s: failed to insert into database",
2414 path);
2415 free(target);
2416 break;
f35a6d3b
LT
2417 case S_IFDIR:
2418 return resolve_gitlink_ref(path, "HEAD", sha1);
ec1fcc16
JH
2419 default:
2420 return error("%s: unsupported file type", path);
2421 }
2422 return 0;
2423}
a69e5429
JH
2424
2425int read_pack_header(int fd, struct pack_header *header)
2426{
2427 char *c = (char*)header;
2428 ssize_t remaining = sizeof(struct pack_header);
2429 do {
2430 ssize_t r = xread(fd, c, remaining);
2431 if (r <= 0)
2432 /* "eof before pack header was fully read" */
2433 return PH_ERROR_EOF;
2434 remaining -= r;
2435 c += r;
2436 } while (remaining > 0);
2437 if (header->hdr_signature != htonl(PACK_SIGNATURE))
2438 /* "protocol error (pack signature mismatch detected)" */
2439 return PH_ERROR_PACK_SIGNATURE;
2440 if (!pack_version_ok(header->hdr_version))
2441 /* "protocol error (pack version unsupported)" */
2442 return PH_ERROR_PROTOCOL;
2443 return 0;
2444}