2 * Copyright (c) 2018 Stefan Sperling <stsp@openbsd.org>
4 * Permission to use, copy, modify, and distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 #include <sys/types.h>
19 #include <sys/queue.h>
33 #include "got_error.h"
34 #include "got_object.h"
35 #include "got_repository.h"
37 #include "got_lib_sha1.h"
38 #include "got_lib_pack.h"
39 #include "got_lib_path.h"
40 #include "got_lib_delta.h"
41 #include "got_lib_zbuf.h"
42 #include "got_lib_object.h"
43 #include "got_lib_repository.h"
46 #define nitems(_a) (sizeof(_a) / sizeof((_a)[0]))
49 #define GOT_PACK_PREFIX "pack-"
50 #define GOT_PACKFILE_SUFFIX ".pack"
51 #define GOT_PACKIDX_SUFFIX ".idx"
52 #define GOT_PACKFILE_NAMELEN (strlen(GOT_PACK_PREFIX) + \
53 SHA1_DIGEST_STRING_LENGTH - 1 + \
54 strlen(GOT_PACKFILE_SUFFIX))
55 #define GOT_PACKIDX_NAMELEN (strlen(GOT_PACK_PREFIX) + \
56 SHA1_DIGEST_STRING_LENGTH - 1 + \
57 strlen(GOT_PACKIDX_SUFFIX))
60 #define MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
63 static const struct got_error *
64 verify_fanout_table(uint32_t *fanout_table)
68 for (i = 0; i < 0xff - 1; i++) {
69 if (be32toh(fanout_table[i]) > be32toh(fanout_table[i + 1]))
70 return got_error(GOT_ERR_BAD_PACKIDX);
76 static const struct got_error *
77 get_packfile_size(size_t *size, const char *path)
84 dot = strrchr(path, '.');
86 return got_error(GOT_ERR_BAD_PATH);
88 /* Path must point to a pack index or to a pack file. */
89 if (strcmp(dot, ".idx") == 0) {
90 const struct got_error *err = NULL;
92 char base_path[PATH_MAX];
94 /* Convert pack index path to pack file path. */
95 if (strlcpy(base_path, path, PATH_MAX) > PATH_MAX)
96 return got_error(GOT_ERR_NO_SPACE);
97 dot = strrchr(base_path, '.');
99 return got_error(GOT_ERR_BAD_PATH);
101 if (asprintf(&path_pack, "%s.pack", base_path) == -1)
102 return got_error_from_errno();
104 if (stat(path_pack, &sb) != 0)
105 err = got_error_from_errno();
109 } else if (strcmp(dot, ".pack") == 0) {
110 if (stat(path, &sb) != 0)
111 return got_error_from_errno();
113 return got_error(GOT_ERR_BAD_PATH);
119 const struct got_error *
120 got_packidx_open(struct got_packidx_v2_hdr **packidx, const char *path)
122 struct got_packidx_v2_hdr *p;
124 const struct got_error *err = NULL;
125 size_t n, nobj, packfile_size;
127 uint8_t sha1[SHA1_DIGEST_LENGTH];
131 f = fopen(path, "rb");
133 return got_error_from_errno();
135 err = get_packfile_size(&packfile_size, path);
139 p = calloc(1, sizeof(*p));
141 err = got_error_from_errno();
145 n = fread(&p->magic, sizeof(p->magic), 1, f);
147 err = got_ferror(f, GOT_ERR_BAD_PACKIDX);
151 if (betoh32(p->magic) != GOT_PACKIDX_V2_MAGIC) {
152 err = got_error(GOT_ERR_BAD_PACKIDX);
156 SHA1Update(&ctx, (uint8_t *)&p->magic, sizeof(p->magic));
158 n = fread(&p->version, sizeof(p->version), 1, f);
160 err = got_ferror(f, GOT_ERR_BAD_PACKIDX);
164 if (betoh32(p->version) != GOT_PACKIDX_VERSION) {
165 err = got_error(GOT_ERR_BAD_PACKIDX);
169 SHA1Update(&ctx, (uint8_t *)&p->version, sizeof(p->version));
171 n = fread(&p->fanout_table, sizeof(p->fanout_table), 1, f);
173 err = got_ferror(f, GOT_ERR_BAD_PACKIDX);
177 err = verify_fanout_table(p->fanout_table);
181 SHA1Update(&ctx, (uint8_t *)p->fanout_table, sizeof(p->fanout_table));
183 nobj = betoh32(p->fanout_table[0xff]);
185 p->sorted_ids = calloc(nobj, sizeof(*p->sorted_ids));
186 if (p->sorted_ids == NULL) {
187 err = got_error_from_errno();
191 n = fread(p->sorted_ids, sizeof(*p->sorted_ids), nobj, f);
193 err = got_ferror(f, GOT_ERR_BAD_PACKIDX);
197 SHA1Update(&ctx, (uint8_t *)p->sorted_ids,
198 nobj * sizeof(*p->sorted_ids));
200 p->crc32 = calloc(nobj, sizeof(*p->crc32));
201 if (p->crc32 == NULL) {
202 err = got_error_from_errno();
206 n = fread(p->crc32, sizeof(*p->crc32), nobj, f);
208 err = got_ferror(f, GOT_ERR_BAD_PACKIDX);
212 SHA1Update(&ctx, (uint8_t *)p->crc32, nobj * sizeof(*p->crc32));
214 p->offsets = calloc(nobj, sizeof(*p->offsets));
215 if (p->offsets == NULL) {
216 err = got_error_from_errno();
220 n = fread(p->offsets, sizeof(*p->offsets), nobj, f);
222 err = got_ferror(f, GOT_ERR_BAD_PACKIDX);
226 SHA1Update(&ctx, (uint8_t *)p->offsets, nobj * sizeof(*p->offsets));
228 /* Large file offsets are contained only in files > 2GB. */
229 if (packfile_size <= 0x80000000)
232 p->large_offsets = calloc(nobj, sizeof(*p->large_offsets));
233 if (p->large_offsets == NULL) {
234 err = got_error_from_errno();
238 n = fread(p->large_offsets, sizeof(*p->large_offsets), nobj, f);
240 err = got_ferror(f, GOT_ERR_BAD_PACKIDX);
244 SHA1Update(&ctx, (uint8_t*)p->large_offsets,
245 nobj * sizeof(*p->large_offsets));
248 n = fread(&p->trailer, sizeof(p->trailer), 1, f);
250 err = got_ferror(f, GOT_ERR_BAD_PACKIDX);
254 SHA1Update(&ctx, p->trailer.packfile_sha1, SHA1_DIGEST_LENGTH);
255 SHA1Final(sha1, &ctx);
256 if (memcmp(p->trailer.packidx_sha1, sha1, SHA1_DIGEST_LENGTH) != 0)
257 err = got_error(GOT_ERR_PACKIDX_CSUM);
261 got_packidx_close(p);
268 got_packidx_close(struct got_packidx_v2_hdr *packidx)
270 free(packidx->sorted_ids);
271 free(packidx->offsets);
272 free(packidx->crc32);
273 free(packidx->large_offsets);
278 is_packidx_filename(const char *name, size_t len)
280 if (len != GOT_PACKIDX_NAMELEN)
283 if (strncmp(name, GOT_PACK_PREFIX, strlen(GOT_PACK_PREFIX)) != 0)
286 if (strcmp(name + strlen(GOT_PACK_PREFIX) +
287 SHA1_DIGEST_STRING_LENGTH - 1, GOT_PACKIDX_SUFFIX) != 0)
294 get_object_offset(struct got_packidx_v2_hdr *packidx, int idx)
296 uint32_t totobj = betoh32(packidx->fanout_table[0xff]);
297 uint32_t offset = betoh32(packidx->offsets[idx]);
298 if (offset & GOT_PACKIDX_OFFSET_VAL_IS_LARGE_IDX) {
300 idx = offset & GOT_PACKIDX_OFFSET_VAL_MASK;
301 if (idx < 0 || idx > totobj || packidx->large_offsets == NULL)
303 loffset = betoh64(packidx->large_offsets[idx]);
304 return (loffset > INT64_MAX ? -1 : (off_t)loffset);
306 return (off_t)(offset & GOT_PACKIDX_OFFSET_VAL_MASK);
309 static const struct got_error *
310 get_packfile_path(char **path_packfile, struct got_repository *repo,
311 struct got_packidx_v2_hdr *packidx);
314 get_object_idx(struct got_packidx_v2_hdr *packidx, struct got_object_id *id, struct got_repository *repo)
316 u_int8_t id0 = id->sha1[0];
317 uint32_t totobj = betoh32(packidx->fanout_table[0xff]);
321 i = betoh32(packidx->fanout_table[id0 - 1]);
324 struct got_object_id *oid = &packidx->sorted_ids[i];
325 int cmp = got_object_id_cmp(id, oid);
335 static struct got_packidx_v2_hdr *
336 dup_packidx(struct got_packidx_v2_hdr *packidx)
338 struct got_packidx_v2_hdr *p;
341 p = calloc(1, sizeof(*p));
345 memcpy(p, packidx, sizeof(*p));
346 p->sorted_ids = NULL;
349 p->large_offsets = NULL;
351 nobj = betoh32(p->fanout_table[0xff]);
353 p->sorted_ids = calloc(nobj, sizeof(*p->sorted_ids));
354 if (p->sorted_ids == NULL)
356 memcpy(p->sorted_ids, packidx->sorted_ids,
357 nobj * sizeof(*p->sorted_ids));
359 p->crc32 = calloc(nobj, sizeof(*p->crc32));
360 if (p->crc32 == NULL)
362 memcpy(p->crc32, packidx->crc32, nobj * sizeof(*p->crc32));
364 p->offsets = calloc(nobj, sizeof(*p->offsets));
365 if (p->offsets == NULL)
367 memcpy(p->offsets, packidx->offsets, nobj * sizeof(*p->offsets));
369 if (p->large_offsets) {
370 p->large_offsets = calloc(nobj, sizeof(*p->large_offsets));
371 if (p->large_offsets == NULL)
373 memcpy(p->large_offsets, packidx->large_offsets,
374 nobj * sizeof(*p->large_offsets));
380 free(p->large_offsets);
389 cache_packidx(struct got_packidx_v2_hdr *packidx, struct got_repository *repo)
393 for (i = 0; i < nitems(repo->packidx_cache); i++) {
394 if (repo->packidx_cache[i] == NULL)
398 if (i == nitems(repo->packidx_cache)) {
399 got_packidx_close(repo->packidx_cache[i - 1]);
400 memmove(&repo->packidx_cache[1], &repo->packidx_cache[0],
401 sizeof(repo->packidx_cache) -
402 sizeof(repo->packidx_cache[0]));
406 repo->packidx_cache[i] = dup_packidx(packidx);
409 static const struct got_error *
410 search_packidx(struct got_packidx_v2_hdr **packidx, int *idx,
411 struct got_repository *repo, struct got_object_id *id)
413 const struct got_error *err;
420 /* Search pack index cache. */
421 for (i = 0; i < nitems(repo->packidx_cache); i++) {
422 if (repo->packidx_cache[i] == NULL)
424 *idx = get_object_idx(repo->packidx_cache[i], id, repo);
426 *packidx = repo->packidx_cache[i];
430 /* No luck. Search the filesystem. */
432 path_packdir = got_repo_get_path_objects_pack(repo);
433 if (path_packdir == NULL)
434 return got_error_from_errno();
436 packdir = opendir(path_packdir);
437 if (packdir == NULL) {
438 err = got_error_from_errno();
442 while ((dent = readdir(packdir)) != NULL) {
443 if (!is_packidx_filename(dent->d_name, dent->d_namlen))
446 if (asprintf(&path_packidx, "%s/%s", path_packdir,
447 dent->d_name) == -1) {
448 err = got_error_from_errno();
452 err = got_packidx_open(packidx, path_packidx);
457 *idx = get_object_idx(*packidx, id, repo);
459 err = NULL; /* found the object */
460 cache_packidx(*packidx, repo);
464 got_packidx_close(*packidx);
468 err = got_error(GOT_ERR_NO_OBJ);
471 if (packdir && closedir(packdir) != 0 && err == 0)
472 err = got_error_from_errno();
476 static const struct got_error *
477 get_packfile_path(char **path_packfile, struct got_repository *repo,
478 struct got_packidx_v2_hdr *packidx)
481 char hex[SHA1_DIGEST_STRING_LENGTH];
484 path_packdir = got_repo_get_path_objects_pack(repo);
485 if (path_packdir == NULL)
486 return got_error_from_errno();
488 sha1str = got_sha1_digest_to_str(packidx->trailer.packfile_sha1,
491 return got_error(GOT_ERR_PACKIDX_CSUM);
493 if (asprintf(path_packfile, "%s/%s%s%s", path_packdir,
494 GOT_PACK_PREFIX, sha1str, GOT_PACKFILE_SUFFIX) == -1) {
495 *path_packfile = NULL;
496 return got_error_from_errno();
502 const struct got_error *
503 read_packfile_hdr(int fd, struct got_packidx_v2_hdr *packidx)
505 const struct got_error *err = NULL;
506 uint32_t totobj = betoh32(packidx->fanout_table[0xff]);
507 struct got_packfile_hdr hdr;
510 n = read(fd, &hdr, sizeof(hdr));
512 return got_error_from_errno();
513 if (n != sizeof(hdr))
514 return got_error(GOT_ERR_BAD_PACKFILE);
516 if (betoh32(hdr.signature) != GOT_PACKFILE_SIGNATURE ||
517 betoh32(hdr.version) != GOT_PACKFILE_VERSION ||
518 betoh32(hdr.nobjects) != totobj)
519 err = got_error(GOT_ERR_BAD_PACKFILE);
524 static const struct got_error *
525 open_packfile(int *fd, const char *path_packfile,
526 struct got_repository *repo, struct got_packidx_v2_hdr *packidx)
528 const struct got_error *err = NULL;
530 *fd = open(path_packfile, O_RDONLY | O_NOFOLLOW, GOT_DEFAULT_FILE_MODE);
532 return got_error_from_errno();
535 err = read_packfile_hdr(*fd, packidx);
545 got_pack_close(struct got_pack *pack)
549 free(pack->path_packfile);
550 pack->path_packfile = NULL;
554 static const struct got_error *
555 cache_pack(struct got_pack **packp, const char *path_packfile,
556 struct got_packidx_v2_hdr *packidx, struct got_repository *repo)
558 const struct got_error *err = NULL;
559 struct got_pack *pack = NULL;
565 for (i = 0; i < nitems(repo->packs); i++) {
566 pack = &repo->packs[i];
567 if (pack->path_packfile == NULL)
569 if (strcmp(pack->path_packfile, path_packfile) == 0)
573 if (i == nitems(repo->packs) - 1) {
574 got_pack_close(&repo->packs[i - 1]);
575 memmove(&repo->packs[1], &repo->packs[0],
576 sizeof(repo->packs) - sizeof(repo->packs[0]));
580 pack = &repo->packs[i];
582 pack->path_packfile = strdup(path_packfile);
583 if (pack->path_packfile == NULL) {
584 err = got_error_from_errno();
588 err = open_packfile(&pack->fd, path_packfile, repo, packidx);
592 err = get_packfile_size(&pack->filesize, path_packfile);
596 free(pack->path_packfile);
604 get_cached_pack(const char *path_packfile, struct got_repository *repo)
606 struct got_pack *pack = NULL;
609 for (i = 0; i < nitems(repo->packs); i++) {
610 pack = &repo->packs[i];
611 if (pack->path_packfile == NULL)
613 if (strcmp(pack->path_packfile, path_packfile) == 0)
620 static const struct got_error *
621 parse_object_type_and_size(uint8_t *type, uint64_t *size, size_t *len, int fd)
630 /* We do not support size values which don't fit in 64 bit. */
632 return got_error(GOT_ERR_NO_SPACE);
634 n = read(fd, &sizeN, sizeof(sizeN));
636 return got_error_from_errno();
637 if (n != sizeof(sizeN))
638 return got_error(GOT_ERR_BAD_PACKFILE);
641 t = (sizeN & GOT_PACK_OBJ_SIZE0_TYPE_MASK) >>
642 GOT_PACK_OBJ_SIZE0_TYPE_MASK_SHIFT;
643 s = (sizeN & GOT_PACK_OBJ_SIZE0_VAL_MASK);
645 size_t shift = 4 + 7 * (i - 1);
646 s |= ((sizeN & GOT_PACK_OBJ_SIZE_VAL_MASK) << shift);
649 } while (sizeN & GOT_PACK_OBJ_SIZE_MORE);
653 *len = i * sizeof(sizeN);
657 static const struct got_error *
658 open_plain_object(struct got_object **obj, const char *path_packfile,
659 struct got_object_id *id, uint8_t type, off_t offset, size_t size)
661 *obj = calloc(1, sizeof(**obj));
663 return got_error_from_errno();
665 (*obj)->path_packfile = strdup(path_packfile);
666 if ((*obj)->path_packfile == NULL) {
667 const struct got_error *err = got_error_from_errno();
674 (*obj)->flags = GOT_OBJ_FLAG_PACKED;
677 memcpy(&(*obj)->id, id, sizeof((*obj)->id));
678 (*obj)->pack_offset = offset;
683 static const struct got_error *
684 parse_negative_offset(int64_t *offset, size_t *len, int fd)
692 /* We do not support offset values which don't fit in 64 bit. */
694 return got_error(GOT_ERR_NO_SPACE);
696 n = read(fd, &offN, sizeof(offN));
698 return got_error_from_errno();
699 if (n != sizeof(offN))
700 return got_error(GOT_ERR_BAD_PACKFILE);
703 o = (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
707 o += (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
710 } while (offN & GOT_PACK_OBJ_DELTA_OFF_MORE);
713 *len = i * sizeof(offN);
717 static const struct got_error *
718 parse_offset_delta(off_t *base_offset, int fd, off_t offset)
720 const struct got_error *err;
724 err = parse_negative_offset(&negoffset, &negofflen, fd);
728 /* Compute the base object's offset (must be in the same pack file). */
729 *base_offset = (offset - negoffset);
730 if (*base_offset <= 0)
731 return got_error(GOT_ERR_BAD_PACKFILE);
736 static const struct got_error *
737 resolve_delta_chain(struct got_delta_chain *, struct got_repository *,
738 int, size_t, const char *, off_t, size_t, int, size_t, unsigned int);
740 static const struct got_error *
741 add_delta(struct got_delta_chain *deltas, const char *path_packfile,
742 off_t delta_offset, size_t tslen, int delta_type, size_t delta_size,
743 size_t delta_data_offset, uint8_t *delta_buf, size_t delta_len)
745 struct got_delta *delta;
747 delta = got_delta_open(path_packfile, delta_offset, tslen,
748 delta_type, delta_size, delta_data_offset, delta_buf,
751 return got_error_from_errno();
752 /* delta is freed in got_object_close() */
754 SIMPLEQ_INSERT_HEAD(&deltas->entries, delta, entry);
758 static const struct got_error *
759 resolve_offset_delta(struct got_delta_chain *deltas,
760 struct got_repository *repo, int fd, size_t packfile_size,
761 const char *path_packfile, off_t delta_offset, size_t tslen,
762 int delta_type, size_t delta_size, unsigned int recursion)
765 const struct got_error *err;
770 off_t delta_data_offset;
774 err = parse_offset_delta(&base_offset, fd, delta_offset);
778 delta_data_offset = lseek(fd, 0, SEEK_CUR);
779 if (delta_data_offset == -1)
780 return got_error_from_errno();
782 err = got_inflate_to_mem_fd(&delta_buf, &delta_len, fd);
786 err = add_delta(deltas, path_packfile, delta_offset, tslen,
787 delta_type, delta_size, delta_data_offset, delta_buf, delta_len);
791 /* An offset delta must be in the same packfile. */
792 if (base_offset >= packfile_size)
793 return got_error(GOT_ERR_PACK_OFFSET);
794 if (lseek(fd, base_offset, SEEK_SET) == -1)
795 return got_error_from_errno();
797 err = parse_object_type_and_size(&base_type, &base_size, &base_tslen,
802 return resolve_delta_chain(deltas, repo, fd, packfile_size,
803 path_packfile, base_offset, base_tslen, base_type, base_size,
807 static const struct got_error *
808 resolve_ref_delta(struct got_delta_chain *deltas, struct got_repository *repo,
809 int fd, const char *path_packfile, off_t delta_offset,
810 size_t tslen, int delta_type, size_t delta_size, unsigned int recursion)
812 const struct got_error *err;
813 struct got_object_id id;
814 struct got_packidx_v2_hdr *packidx;
821 char *path_base_packfile;
822 struct got_pack *base_pack;
823 off_t delta_data_offset;
827 n = read(fd, &id, sizeof(id));
829 return got_error_from_errno();
831 return got_error(GOT_ERR_BAD_PACKFILE);
833 delta_data_offset = lseek(fd, 0, SEEK_CUR);
834 if (delta_data_offset == -1)
835 return got_error_from_errno();
837 err = got_inflate_to_mem_fd(&delta_buf, &delta_len, fd);
841 err = add_delta(deltas, path_packfile, delta_offset, tslen,
842 delta_type, delta_size, delta_data_offset, delta_buf, delta_len);
846 err = search_packidx(&packidx, &idx, repo, &id);
850 base_offset = get_object_offset(packidx, idx);
851 if (base_offset == (uint64_t)-1) {
852 return got_error(GOT_ERR_BAD_PACKIDX);
855 err = get_packfile_path(&path_base_packfile, repo, packidx);
859 base_pack = get_cached_pack(path_base_packfile, repo);
860 if (base_pack == NULL) {
861 err = cache_pack(&base_pack, path_base_packfile, NULL, repo);
866 if (base_offset >= base_pack->filesize) {
867 err = got_error(GOT_ERR_PACK_OFFSET);
870 if (lseek(base_pack->fd, base_offset, SEEK_SET) == -1) {
871 err = got_error_from_errno();
875 err = parse_object_type_and_size(&base_type, &base_size, &base_tslen,
880 err = resolve_delta_chain(deltas, repo, base_pack->fd,
881 base_pack->filesize, path_base_packfile, base_offset,
882 base_tslen, base_type, base_size, recursion - 1);
884 free(path_base_packfile);
888 static const struct got_error *
889 resolve_delta_chain(struct got_delta_chain *deltas, struct got_repository *repo,
890 int fd, size_t packfile_size, const char *path_packfile, off_t delta_offset,
891 size_t tslen, int delta_type, size_t delta_size, unsigned int recursion)
893 const struct got_error *err = NULL;
895 if (--recursion == 0)
896 return got_error(GOT_ERR_RECURSION);
898 switch (delta_type) {
899 case GOT_OBJ_TYPE_COMMIT:
900 case GOT_OBJ_TYPE_TREE:
901 case GOT_OBJ_TYPE_BLOB:
902 case GOT_OBJ_TYPE_TAG:
903 /* Plain types are the final delta base. Recursion ends. */
904 err = add_delta(deltas, path_packfile, delta_offset, tslen,
905 delta_type, delta_size, 0, NULL, 0);
907 case GOT_OBJ_TYPE_OFFSET_DELTA:
908 err = resolve_offset_delta(deltas, repo, fd, packfile_size,
909 path_packfile, delta_offset, tslen, delta_type, delta_size,
912 case GOT_OBJ_TYPE_REF_DELTA:
913 err = resolve_ref_delta(deltas, repo, fd, path_packfile,
914 delta_offset, tslen, delta_type, delta_size, recursion - 1);
917 return got_error(GOT_ERR_OBJ_TYPE);
923 static const struct got_error *
924 open_delta_object(struct got_object **obj, struct got_repository *repo,
925 struct got_packidx_v2_hdr *packidx, const char *path_packfile,
926 int fd, size_t packfile_size, struct got_object_id *id, off_t offset,
927 size_t tslen, int delta_type, size_t delta_size)
929 const struct got_error *err = NULL;
932 *obj = calloc(1, sizeof(**obj));
934 return got_error_from_errno();
938 (*obj)->size = 0; /* Not known because deltas aren't applied yet. */
939 memcpy(&(*obj)->id, id, sizeof((*obj)->id));
940 (*obj)->pack_offset = offset + tslen;
942 (*obj)->path_packfile = strdup(path_packfile);
943 if ((*obj)->path_packfile == NULL) {
944 err = got_error_from_errno();
947 (*obj)->flags |= GOT_OBJ_FLAG_PACKED;
949 SIMPLEQ_INIT(&(*obj)->deltas.entries);
950 (*obj)->flags |= GOT_OBJ_FLAG_DELTIFIED;
952 err = resolve_delta_chain(&(*obj)->deltas, repo, fd, packfile_size,
953 path_packfile, offset, tslen, delta_type, delta_size,
954 GOT_DELTA_CHAIN_RECURSION_MAX);
958 err = got_delta_chain_get_base_type(&resolved_type, &(*obj)->deltas);
961 (*obj)->type = resolved_type;
965 got_object_close(*obj);
971 static const struct got_error *
972 open_packed_object(struct got_object **obj, struct got_repository *repo,
973 struct got_packidx_v2_hdr *packidx, int idx, struct got_object_id *id)
975 const struct got_error *err = NULL;
978 struct got_pack *pack;
985 offset = get_object_offset(packidx, idx);
986 if (offset == (uint64_t)-1)
987 return got_error(GOT_ERR_BAD_PACKIDX);
989 err = get_packfile_path(&path_packfile, repo, packidx);
993 pack = get_cached_pack(path_packfile, repo);
995 err = cache_pack(&pack, path_packfile, packidx, repo);
1000 if (offset >= pack->filesize) {
1001 err = got_error(GOT_ERR_PACK_OFFSET);
1004 if (lseek(pack->fd, offset, SEEK_SET) == -1) {
1005 err = got_error_from_errno();
1009 err = parse_object_type_and_size(&type, &size, &tslen, pack->fd);
1014 case GOT_OBJ_TYPE_COMMIT:
1015 case GOT_OBJ_TYPE_TREE:
1016 case GOT_OBJ_TYPE_BLOB:
1017 case GOT_OBJ_TYPE_TAG:
1018 err = open_plain_object(obj, path_packfile, id, type,
1019 offset + tslen, size);
1022 case GOT_OBJ_TYPE_OFFSET_DELTA:
1023 case GOT_OBJ_TYPE_REF_DELTA:
1024 err = open_delta_object(obj, repo, packidx, path_packfile,
1025 pack->fd, pack->filesize, id, offset, tslen, type, size);
1029 err = got_error(GOT_ERR_OBJ_TYPE);
1033 free(path_packfile);
1037 const struct got_error *
1038 got_packfile_open_object(struct got_object **obj, struct got_object_id *id,
1039 struct got_repository *repo)
1041 const struct got_error *err = NULL;
1042 struct got_packidx_v2_hdr *packidx = NULL;
1045 err = search_packidx(&packidx, &idx, repo, id);
1049 err = open_packed_object(obj, repo, packidx, idx, id);
1053 err = cache_pack(NULL, (*obj)->path_packfile, packidx, repo);
1057 static const struct got_error *
1058 get_delta_chain_max_size(uint64_t *max_size, struct got_delta_chain *deltas)
1060 struct got_delta *delta;
1061 uint64_t base_size = 0, result_size = 0;
1064 SIMPLEQ_FOREACH(delta, &deltas->entries, entry) {
1065 /* Plain object types are the delta base. */
1066 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1067 delta->type != GOT_OBJ_TYPE_TREE &&
1068 delta->type != GOT_OBJ_TYPE_BLOB &&
1069 delta->type != GOT_OBJ_TYPE_TAG) {
1070 const struct got_error *err;
1071 err = got_delta_get_sizes(&base_size, &result_size,
1072 delta->delta_buf, delta->delta_len);
1076 base_size = delta->size;
1077 if (base_size > *max_size)
1078 *max_size = base_size;
1079 if (result_size > *max_size)
1080 *max_size = result_size;
1086 static const struct got_error *
1087 dump_delta_chain_to_file(size_t *result_size, struct got_delta_chain *deltas,
1088 FILE *outfile, struct got_repository *repo)
1090 const struct got_error *err = NULL;
1091 struct got_delta *delta;
1092 FILE *base_file = NULL, *accum_file = NULL;
1093 uint8_t *base_buf = NULL, *accum_buf = NULL;
1094 size_t accum_size = 0;
1100 if (SIMPLEQ_EMPTY(&deltas->entries))
1101 return got_error(GOT_ERR_BAD_DELTA_CHAIN);
1103 /* We process small enough files entirely in memory for speed. */
1104 err = get_delta_chain_max_size(&max_size, deltas);
1107 if (max_size < GOT_DELTA_RESULT_SIZE_CACHED_MAX) {
1108 accum_buf = malloc(max_size);
1109 if (accum_buf == NULL)
1110 return got_error_from_errno();
1112 base_file = got_opentemp();
1113 if (base_file == NULL)
1114 return got_error_from_errno();
1116 accum_file = got_opentemp();
1117 if (accum_file == NULL) {
1118 err = got_error_from_errno();
1124 /* Deltas are ordered in ascending order. */
1125 SIMPLEQ_FOREACH(delta, &deltas->entries, entry) {
1127 struct got_pack *pack;
1129 off_t delta_data_offset;
1131 /* Plain object types are the delta base. */
1132 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1133 delta->type != GOT_OBJ_TYPE_TREE &&
1134 delta->type != GOT_OBJ_TYPE_BLOB &&
1135 delta->type != GOT_OBJ_TYPE_TAG) {
1136 err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1140 pack = get_cached_pack(delta->path_packfile, repo);
1142 err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1146 delta_data_offset = delta->offset + delta->tslen;
1147 if (delta_data_offset >= pack->filesize) {
1148 err = got_error(GOT_ERR_PACK_OFFSET);
1151 if (lseek(pack->fd, delta_data_offset, SEEK_SET) == -1) {
1152 err = got_error_from_errno();
1156 err = got_inflate_to_file_fd(&base_len,
1157 pack->fd, base_file);
1159 err = got_inflate_to_mem_fd(&base_buf, &base_len,
1161 if (base_len < max_size) {
1163 p = reallocarray(base_buf, 1, max_size);
1165 err = got_error_from_errno();
1180 err = got_delta_apply_in_mem(base_buf, delta->delta_buf,
1181 delta->delta_len, accum_buf, &accum_size);
1184 err = got_delta_apply(base_file, delta->delta_buf,
1186 /* Final delta application writes to output file. */
1187 ++n < deltas->nentries ? accum_file : outfile,
1193 if (n < deltas->nentries) {
1194 /* Accumulated delta becomes the new base. */
1196 uint8_t *tmp = accum_buf;
1197 accum_buf = base_buf;
1200 FILE *tmp = accum_file;
1201 accum_file = base_file;
1212 size_t len = fwrite(accum_buf, 1, accum_size, outfile);
1214 if (len != accum_size)
1215 return got_ferror(outfile, GOT_ERR_IO);
1223 *result_size = accum_size;
1227 static const struct got_error *
1228 dump_delta_chain_to_mem(uint8_t **outbuf, size_t *outlen,
1229 struct got_delta_chain *deltas, struct got_repository *repo)
1231 const struct got_error *err = NULL;
1232 struct got_delta *delta;
1233 uint8_t *base_buf = NULL, *accum_buf = NULL;
1241 if (SIMPLEQ_EMPTY(&deltas->entries))
1242 return got_error(GOT_ERR_BAD_DELTA_CHAIN);
1244 err = get_delta_chain_max_size(&max_size, deltas);
1247 accum_buf = malloc(max_size);
1248 if (accum_buf == NULL)
1249 return got_error_from_errno();
1251 /* Deltas are ordered in ascending order. */
1252 SIMPLEQ_FOREACH(delta, &deltas->entries, entry) {
1254 struct got_pack *pack;
1256 size_t delta_data_offset;
1258 /* Plain object types are the delta base. */
1259 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1260 delta->type != GOT_OBJ_TYPE_TREE &&
1261 delta->type != GOT_OBJ_TYPE_BLOB &&
1262 delta->type != GOT_OBJ_TYPE_TAG) {
1263 err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1267 pack = get_cached_pack(delta->path_packfile, repo);
1269 err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1273 delta_data_offset = delta->offset + delta->tslen;
1274 if (delta_data_offset >= pack->filesize) {
1275 err = got_error(GOT_ERR_PACK_OFFSET);
1278 if (lseek(pack->fd, delta_data_offset, SEEK_SET) == -1) {
1279 err = got_error_from_errno();
1282 err = got_inflate_to_mem_fd(&base_buf, &base_len,
1284 if (base_len < max_size) {
1286 p = reallocarray(base_buf, 1, max_size);
1288 err = got_error_from_errno();
1299 err = got_delta_apply_in_mem(base_buf, delta->delta_buf,
1300 delta->delta_len, accum_buf, &accum_size);
1305 if (n < deltas->nentries) {
1306 /* Accumulated delta becomes the new base. */
1307 uint8_t *tmp = accum_buf;
1308 accum_buf = base_buf;
1320 *outbuf = accum_buf;
1321 *outlen = accum_size;
1326 const struct got_error *
1327 got_packfile_extract_object(FILE **f, struct got_object *obj,
1328 struct got_repository *repo)
1330 const struct got_error *err = NULL;
1334 if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
1335 return got_error(GOT_ERR_OBJ_NOT_PACKED);
1337 *f = got_opentemp();
1339 err = got_error_from_errno();
1343 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0) {
1344 struct got_pack *pack;
1346 pack = get_cached_pack(obj->path_packfile, repo);
1348 err = cache_pack(&pack, obj->path_packfile, NULL, repo);
1353 if (obj->pack_offset >= pack->filesize) {
1354 err = got_error(GOT_ERR_PACK_OFFSET);
1357 if (lseek(pack->fd, obj->pack_offset, SEEK_SET) == -1) {
1358 err = got_error_from_errno();
1362 err = got_inflate_to_file_fd(&obj->size, pack->fd, *f);
1364 err = dump_delta_chain_to_file(&obj->size,
1365 &obj->deltas, *f, repo);
1374 const struct got_error *
1375 got_packfile_extract_object_to_mem(uint8_t **buf, size_t *len,
1376 struct got_object *obj, struct got_repository *repo)
1378 const struct got_error *err = NULL;
1380 if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
1381 return got_error(GOT_ERR_OBJ_NOT_PACKED);
1383 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0) {
1384 struct got_pack *pack;
1386 pack = get_cached_pack(obj->path_packfile, repo);
1388 err = cache_pack(&pack, obj->path_packfile, NULL, repo);
1393 if (obj->pack_offset >= pack->filesize) {
1394 err = got_error(GOT_ERR_PACK_OFFSET);
1397 if (lseek(pack->fd, obj->pack_offset, SEEK_SET) == -1) {
1398 err = got_error_from_errno();
1402 err = got_inflate_to_mem_fd(buf, len, pack->fd);
1404 err = dump_delta_chain_to_mem(buf, len, &obj->deltas, repo);