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>
34 #include "got_error.h"
35 #include "got_object.h"
36 #include "got_repository.h"
38 #include "got_sha1_lib.h"
39 #include "got_pack_lib.h"
40 #include "got_path_lib.h"
41 #include "got_delta_lib.h"
42 #include "got_zbuf_lib.h"
43 #include "got_object_lib.h"
44 #include "got_repository_lib.h"
47 #define nitems(_a) (sizeof(_a) / sizeof((_a)[0]))
50 #define GOT_PACK_PREFIX "pack-"
51 #define GOT_PACKFILE_SUFFIX ".pack"
52 #define GOT_PACKIDX_SUFFIX ".idx"
53 #define GOT_PACKFILE_NAMELEN (strlen(GOT_PACK_PREFIX) + \
54 SHA1_DIGEST_STRING_LENGTH - 1 + \
55 strlen(GOT_PACKFILE_SUFFIX))
56 #define GOT_PACKIDX_NAMELEN (strlen(GOT_PACK_PREFIX) + \
57 SHA1_DIGEST_STRING_LENGTH - 1 + \
58 strlen(GOT_PACKIDX_SUFFIX))
61 #define MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
64 static const struct got_error *
65 verify_fanout_table(uint32_t *fanout_table)
69 for (i = 0; i < 0xff - 1; i++) {
70 if (be32toh(fanout_table[i]) > be32toh(fanout_table[i + 1]))
71 return got_error(GOT_ERR_BAD_PACKIDX);
77 static const struct got_error *
78 get_packfile_size(size_t *size, const char *path_idx)
82 char base_path[PATH_MAX];
85 if (strlcpy(base_path, path_idx, PATH_MAX) > PATH_MAX)
86 return got_error(GOT_ERR_NO_SPACE);
88 dot = strrchr(base_path, '.');
90 return got_error(GOT_ERR_BAD_PATH);
92 if (asprintf(&path_pack, "%s.pack", base_path) == -1)
93 return got_error(GOT_ERR_NO_MEM);
95 if (stat(path_pack, &sb) != 0) {
97 return got_error_from_errno();
105 const struct got_error *
106 got_packidx_open(struct got_packidx_v2_hdr **packidx, const char *path)
108 struct got_packidx_v2_hdr *p;
110 const struct got_error *err = NULL;
111 size_t n, nobj, packfile_size;
113 uint8_t sha1[SHA1_DIGEST_LENGTH];
117 f = fopen(path, "rb");
119 return got_error_from_errno();
121 err = get_packfile_size(&packfile_size, path);
125 p = calloc(1, sizeof(*p));
127 err = got_error(GOT_ERR_NO_MEM);
131 n = fread(&p->magic, sizeof(p->magic), 1, f);
133 err = got_ferror(f, GOT_ERR_BAD_PACKIDX);
137 if (betoh32(p->magic) != GOT_PACKIDX_V2_MAGIC) {
138 err = got_error(GOT_ERR_BAD_PACKIDX);
142 SHA1Update(&ctx, (uint8_t *)&p->magic, sizeof(p->magic));
144 n = fread(&p->version, sizeof(p->version), 1, f);
146 err = got_ferror(f, GOT_ERR_BAD_PACKIDX);
150 if (betoh32(p->version) != GOT_PACKIDX_VERSION) {
151 err = got_error(GOT_ERR_BAD_PACKIDX);
155 SHA1Update(&ctx, (uint8_t *)&p->version, sizeof(p->version));
157 n = fread(&p->fanout_table, sizeof(p->fanout_table), 1, f);
159 err = got_ferror(f, GOT_ERR_BAD_PACKIDX);
163 err = verify_fanout_table(p->fanout_table);
167 SHA1Update(&ctx, (uint8_t *)p->fanout_table, sizeof(p->fanout_table));
169 nobj = betoh32(p->fanout_table[0xff]);
171 p->sorted_ids = calloc(nobj, sizeof(*p->sorted_ids));
172 if (p->sorted_ids == NULL) {
173 err = got_error(GOT_ERR_NO_MEM);
177 n = fread(p->sorted_ids, sizeof(*p->sorted_ids), nobj, f);
179 err = got_ferror(f, GOT_ERR_BAD_PACKIDX);
183 SHA1Update(&ctx, (uint8_t *)p->sorted_ids,
184 nobj * sizeof(*p->sorted_ids));
186 p->crc32 = calloc(nobj, sizeof(*p->crc32));
187 if (p->crc32 == NULL) {
188 err = got_error(GOT_ERR_NO_MEM);
192 n = fread(p->crc32, sizeof(*p->crc32), nobj, f);
194 err = got_ferror(f, GOT_ERR_BAD_PACKIDX);
198 SHA1Update(&ctx, (uint8_t *)p->crc32, nobj * sizeof(*p->crc32));
200 p->offsets = calloc(nobj, sizeof(*p->offsets));
201 if (p->offsets == NULL) {
202 err = got_error(GOT_ERR_NO_MEM);
206 n = fread(p->offsets, sizeof(*p->offsets), nobj, f);
208 err = got_ferror(f, GOT_ERR_BAD_PACKIDX);
212 SHA1Update(&ctx, (uint8_t *)p->offsets, nobj * sizeof(*p->offsets));
214 /* Large file offsets are contained only in files > 2GB. */
215 if (packfile_size <= 0x80000000)
218 p->large_offsets = calloc(nobj, sizeof(*p->large_offsets));
219 if (p->large_offsets == NULL) {
220 err = got_error(GOT_ERR_NO_MEM);
224 n = fread(p->large_offsets, sizeof(*p->large_offsets), nobj, f);
226 err = got_ferror(f, GOT_ERR_BAD_PACKIDX);
230 SHA1Update(&ctx, (uint8_t*)p->large_offsets,
231 nobj * sizeof(*p->large_offsets));
234 n = fread(&p->trailer, sizeof(p->trailer), 1, f);
236 err = got_ferror(f, GOT_ERR_BAD_PACKIDX);
240 SHA1Update(&ctx, p->trailer.packfile_sha1, SHA1_DIGEST_LENGTH);
241 SHA1Final(sha1, &ctx);
242 if (memcmp(p->trailer.packidx_sha1, sha1, SHA1_DIGEST_LENGTH) != 0)
243 err = got_error(GOT_ERR_PACKIDX_CSUM);
247 got_packidx_close(p);
254 got_packidx_close(struct got_packidx_v2_hdr *packidx)
256 free(packidx->sorted_ids);
257 free(packidx->offsets);
258 free(packidx->crc32);
259 free(packidx->large_offsets);
264 is_packidx_filename(const char *name, size_t len)
266 if (len != GOT_PACKIDX_NAMELEN)
269 if (strncmp(name, GOT_PACK_PREFIX, strlen(GOT_PACK_PREFIX)) != 0)
272 if (strcmp(name + strlen(GOT_PACK_PREFIX) +
273 SHA1_DIGEST_STRING_LENGTH - 1, GOT_PACKIDX_SUFFIX) != 0)
280 get_object_offset(struct got_packidx_v2_hdr *packidx, int idx)
282 uint32_t totobj = betoh32(packidx->fanout_table[0xff]);
283 uint32_t offset = betoh32(packidx->offsets[idx]);
284 if (offset & GOT_PACKIDX_OFFSET_VAL_IS_LARGE_IDX) {
286 idx = offset & GOT_PACKIDX_OFFSET_VAL_MASK;
287 if (idx < 0 || idx > totobj || packidx->large_offsets == NULL)
289 loffset = betoh64(packidx->large_offsets[idx]);
290 return (loffset > INT64_MAX ? -1 : (off_t)loffset);
292 return (off_t)(offset & GOT_PACKIDX_OFFSET_VAL_MASK);
296 get_object_idx(struct got_packidx_v2_hdr *packidx, struct got_object_id *id)
298 u_int8_t id0 = id->sha1[0];
299 uint32_t totobj = betoh32(packidx->fanout_table[0xff]);
303 i = betoh32(packidx->fanout_table[id0 - 1]);
306 struct got_object_id *oid = &packidx->sorted_ids[i];
307 int cmp = got_object_id_cmp(id, oid);
317 static struct got_packidx_v2_hdr *
318 dup_packidx(struct got_packidx_v2_hdr *packidx)
320 struct got_packidx_v2_hdr *p;
323 p = calloc(1, sizeof(*p));
327 memcpy(p, packidx, sizeof(*p));
328 p->sorted_ids = NULL;
331 p->large_offsets = NULL;
333 nobj = betoh32(p->fanout_table[0xff]);
335 p->sorted_ids = calloc(nobj, sizeof(*p->sorted_ids));
336 if (p->sorted_ids == NULL)
338 memcpy(p->sorted_ids, packidx->sorted_ids, nobj * sizeof(*p->sorted_ids));
340 p->crc32 = calloc(nobj, sizeof(*p->crc32));
341 if (p->crc32 == NULL)
343 memcpy(p->crc32, packidx->crc32, nobj * sizeof(*p->crc32));
345 p->offsets = calloc(nobj, sizeof(*p->offsets));
346 if (p->offsets == NULL)
348 memcpy(p->offsets, packidx->offsets, nobj * sizeof(*p->offsets));
350 if (p->large_offsets) {
351 p->large_offsets = calloc(nobj, sizeof(*p->large_offsets));
352 if (p->large_offsets == NULL)
354 memcpy(p->large_offsets, packidx->large_offsets,
355 nobj * sizeof(*p->large_offsets));
361 free(p->large_offsets);
370 cache_packidx(struct got_packidx_v2_hdr *packidx, struct got_repository *repo)
374 for (i = 0; i < nitems(repo->packidx_cache); i++) {
375 if (repo->packidx_cache[i] == NULL)
379 if (i == nitems(repo->packidx_cache)) {
380 got_packidx_close(repo->packidx_cache[i - 1]);
381 memmove(&repo->packidx_cache[1], &repo->packidx_cache[0],
382 sizeof(repo->packidx_cache) -
383 sizeof(repo->packidx_cache[0]));
387 repo->packidx_cache[i] = dup_packidx(packidx);
390 static const struct got_error *
391 search_packidx(struct got_packidx_v2_hdr **packidx, int *idx,
392 struct got_repository *repo, struct got_object_id *id)
394 const struct got_error *err;
401 /* Search pack index cache. */
402 for (i = 0; i < nitems(repo->packidx_cache); i++) {
403 if (repo->packidx_cache[i] == NULL)
405 *idx = get_object_idx(repo->packidx_cache[i], id);
407 *packidx = repo->packidx_cache[i];
408 if (*packidx == NULL)
409 return got_error(GOT_ERR_NO_MEM);
413 /* No luck. Search the filesystem. */
415 path_packdir = got_repo_get_path_objects_pack(repo);
416 if (path_packdir == NULL)
417 return got_error(GOT_ERR_NO_MEM);
419 packdir = opendir(path_packdir);
420 if (packdir == NULL) {
421 err = got_error_from_errno();
425 while ((dent = readdir(packdir)) != NULL) {
426 if (!is_packidx_filename(dent->d_name, dent->d_namlen))
429 if (asprintf(&path_packidx, "%s/%s", path_packdir,
430 dent->d_name) == -1) {
431 err = got_error(GOT_ERR_NO_MEM);
435 err = got_packidx_open(packidx, path_packidx);
440 *idx = get_object_idx(*packidx, id);
442 err = NULL; /* found the object */
443 cache_packidx(*packidx, repo);
447 got_packidx_close(*packidx);
451 err = got_error(GOT_ERR_NO_OBJ);
454 if (packdir && closedir(packdir) != 0 && err == 0)
455 err = got_error_from_errno();
459 static const struct got_error *
460 get_packfile_path(char **path_packfile, struct got_repository *repo,
461 struct got_packidx_v2_hdr *packidx)
464 char hex[SHA1_DIGEST_STRING_LENGTH];
467 path_packdir = got_repo_get_path_objects_pack(repo);
468 if (path_packdir == NULL)
469 return got_error(GOT_ERR_NO_MEM);
471 sha1str = got_sha1_digest_to_str(packidx->trailer.packfile_sha1,
474 return got_error(GOT_ERR_PACKIDX_CSUM);
476 if (asprintf(path_packfile, "%s/%s%s%s", path_packdir,
477 GOT_PACK_PREFIX, sha1str, GOT_PACKFILE_SUFFIX) == -1) {
478 *path_packfile = NULL;
479 return got_error(GOT_ERR_NO_MEM);
485 const struct got_error *
486 read_packfile_hdr(FILE *f, struct got_packidx_v2_hdr *packidx)
488 const struct got_error *err = NULL;
489 uint32_t totobj = betoh32(packidx->fanout_table[0xff]);
490 struct got_packfile_hdr hdr;
493 n = fread(&hdr, sizeof(hdr), 1, f);
495 return got_ferror(f, GOT_ERR_BAD_PACKIDX);
497 if (betoh32(hdr.signature) != GOT_PACKFILE_SIGNATURE ||
498 betoh32(hdr.version) != GOT_PACKFILE_VERSION ||
499 betoh32(hdr.nobjects) != totobj)
500 err = got_error(GOT_ERR_BAD_PACKFILE);
506 static const struct got_error *
507 map_packfile_segment(struct got_pack_mapping **map, const char *path_packfile,
508 off_t offset, size_t len)
510 const struct got_error *err = NULL;
512 if (len < GOT_PACK_MAPPING_MIN_SIZE)
513 len = GOT_PACK_MAPPING_MIN_SIZE;
515 if (len > GOT_PACK_MAPPING_MAX_SIZE)
516 return got_error(GOT_ERR_NO_SPACE);
518 *map = calloc(1, sizeof(**map));
520 return got_error(GOT_ERR_NO_MEM);
522 (*map)->fd = open(path_packfile, O_RDONLY | O_NOFOLLOW);
523 if ((*map)->fd == -1) {
524 err = got_error_from_errno();
530 (*map)->addr = mmap(NULL, len, PROT_READ, MAP_PRIVATE, (*map)->fd, offset);
531 if ((*map)->addr == NULL) {
532 err = got_error_from_errno();
539 (*map)->offset = offset;
546 static const struct got_error *
547 unmap_packfile_segment(struct got_pack_mapping *map)
549 if (munmap(map->addr, map->len) == -1 || close(map->fd) == -1)
550 return got_error_from_errno();
555 static const struct got_error *
556 open_packfile(FILE **packfile, const char *path_packfile,
557 struct got_repository *repo, struct got_packidx_v2_hdr *packidx)
559 const struct got_error *err = NULL;
563 *packfile = fopen(path_packfile, "rb");
564 if (*packfile == NULL) {
565 err = got_error_from_errno();
570 err = read_packfile_hdr(*packfile, packidx);
579 const struct got_error *
580 got_pack_close(struct got_pack *pack)
582 const struct got_error *err = NULL;
584 while (!TAILQ_EMPTY(&pack->mappings)) {
585 struct got_pack_mapping *map = TAILQ_FIRST(&pack->mappings);
586 err = unmap_packfile_segment(map);
589 TAILQ_REMOVE(&pack->mappings, map, entry);
594 fclose(pack->packfile);
595 pack->packfile = NULL;
596 free(pack->path_packfile);
597 pack->path_packfile = NULL;
604 static const struct got_error *
605 cache_pack(struct got_pack **packp, const char *path_packfile,
606 struct got_packidx_v2_hdr *packidx, struct got_repository *repo)
608 const struct got_error *err = NULL;
609 struct got_pack *pack = NULL;
615 for (i = 0; i < nitems(repo->packs); i++) {
616 pack = &repo->packs[i];
617 if (pack->path_packfile == NULL)
619 if (strcmp(pack->path_packfile, path_packfile) == 0)
623 if (i == nitems(repo->packs) - 1) {
624 got_pack_close(&repo->packs[i - 1]);
625 memmove(&repo->packs[1], &repo->packs[0],
626 sizeof(repo->packs) - sizeof(repo->packs[0]));
630 pack = &repo->packs[i];
632 TAILQ_INIT(&pack->mappings);
634 pack->path_packfile = strdup(path_packfile);
635 if (pack->path_packfile == NULL) {
636 err = got_error(GOT_ERR_NO_MEM);
640 err = open_packfile(&pack->packfile, path_packfile, repo, packidx);
644 err = get_packfile_size(&pack->filesize, path_packfile);
648 free(pack->path_packfile);
656 get_cached_pack(const char *path_packfile, struct got_repository *repo)
658 struct got_pack *pack = NULL;
661 for (i = 0; i < nitems(repo->packs); i++) {
662 pack = &repo->packs[i];
663 if (pack->path_packfile == NULL)
665 if (strcmp(pack->path_packfile, path_packfile) == 0)
672 static const struct got_error *
673 parse_object_type_and_size(uint8_t *type, uint64_t *size, size_t *len,
683 /* We do not support size values which don't fit in 64 bit. */
685 return got_error(GOT_ERR_NO_SPACE);
687 n = fread(&sizeN, sizeof(sizeN), 1, packfile);
689 return got_ferror(packfile, GOT_ERR_BAD_PACKIDX);
692 t = (sizeN & GOT_PACK_OBJ_SIZE0_TYPE_MASK) >>
693 GOT_PACK_OBJ_SIZE0_TYPE_MASK_SHIFT;
694 s = (sizeN & GOT_PACK_OBJ_SIZE0_VAL_MASK);
696 size_t shift = 4 + 7 * (i - 1);
697 s |= ((sizeN & GOT_PACK_OBJ_SIZE_VAL_MASK) << shift);
700 } while (sizeN & GOT_PACK_OBJ_SIZE_MORE);
704 *len = i * sizeof(sizeN);
708 static const struct got_error *
709 open_plain_object(struct got_object **obj, const char *path_packfile,
710 struct got_object_id *id, uint8_t type, off_t offset, size_t size)
712 *obj = calloc(1, sizeof(**obj));
714 return got_error(GOT_ERR_NO_MEM);
716 (*obj)->path_packfile = strdup(path_packfile);
717 if ((*obj)->path_packfile == NULL) {
720 return got_error(GOT_ERR_NO_MEM);
724 (*obj)->flags = GOT_OBJ_FLAG_PACKED;
727 memcpy(&(*obj)->id, id, sizeof((*obj)->id));
728 (*obj)->pack_offset = offset;
733 static const struct got_error *
734 parse_negative_offset(int64_t *offset, size_t *len, FILE *packfile)
742 /* We do not support offset values which don't fit in 64 bit. */
744 return got_error(GOT_ERR_NO_SPACE);
746 n = fread(&offN, sizeof(offN), 1, packfile);
748 return got_ferror(packfile, GOT_ERR_BAD_PACKIDX);
751 o = (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
755 o += (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
758 } while (offN & GOT_PACK_OBJ_DELTA_OFF_MORE);
761 *len = i * sizeof(offN);
765 static const struct got_error *
766 parse_offset_delta(off_t *base_offset, FILE *packfile, off_t offset)
768 const struct got_error *err;
772 err = parse_negative_offset(&negoffset, &negofflen, packfile);
776 /* Compute the base object's offset (must be in the same pack file). */
777 *base_offset = (offset - negoffset);
778 if (*base_offset <= 0)
779 return got_error(GOT_ERR_BAD_PACKFILE);
784 static const struct got_error *
785 resolve_delta_chain(struct got_delta_chain *, struct got_repository *,
786 FILE *, const char *, off_t, size_t, int, size_t);
788 static const struct got_error *
789 add_delta(struct got_delta_chain *deltas, const char *path_packfile,
790 off_t delta_offset, size_t tslen, int delta_type, size_t delta_size,
791 size_t delta_data_offset, uint8_t *delta_buf, size_t delta_len)
793 struct got_delta *delta;
795 delta = got_delta_open(path_packfile, delta_offset, tslen,
796 delta_type, delta_size, delta_data_offset, delta_buf,
799 return got_error(GOT_ERR_NO_MEM);
800 /* delta is freed in got_object_close() */
802 SIMPLEQ_INSERT_HEAD(&deltas->entries, delta, entry);
806 static const struct got_error *
807 resolve_offset_delta(struct got_delta_chain *deltas,
808 struct got_repository *repo, FILE *packfile, const char *path_packfile,
809 off_t delta_offset,size_t tslen, int delta_type, size_t delta_size)
812 const struct got_error *err;
817 off_t delta_data_offset;
821 err = parse_offset_delta(&base_offset, packfile, delta_offset);
825 delta_data_offset = ftello(packfile);
826 if (delta_data_offset == -1)
827 return got_error_from_errno();
829 err = got_inflate_to_mem(&delta_buf, &delta_len, packfile);
833 err = add_delta(deltas, path_packfile, delta_offset, tslen,
834 delta_type, delta_size, delta_data_offset, delta_buf, delta_len);
838 /* An offset delta must be in the same packfile. */
839 if (fseeko(packfile, base_offset, SEEK_SET) != 0)
840 return got_error_from_errno();
842 err = parse_object_type_and_size(&base_type, &base_size, &base_tslen,
847 return resolve_delta_chain(deltas, repo, packfile, path_packfile,
848 base_offset, base_tslen, base_type, base_size);
851 static const struct got_error *
852 resolve_ref_delta(struct got_delta_chain *deltas, struct got_repository *repo,
853 FILE *packfile, const char *path_packfile, off_t delta_offset,
854 size_t tslen, int delta_type, size_t delta_size)
856 const struct got_error *err;
857 struct got_object_id id;
858 struct got_packidx_v2_hdr *packidx;
865 char *path_base_packfile;
866 struct got_pack *base_pack;
867 off_t delta_data_offset;
871 n = fread(&id, sizeof(id), 1, packfile);
873 return got_ferror(packfile, GOT_ERR_IO);
875 delta_data_offset = ftello(packfile);
876 if (delta_data_offset == -1)
877 return got_error_from_errno();
879 err = got_inflate_to_mem(&delta_buf, &delta_len, packfile);
883 err = add_delta(deltas, path_packfile, delta_offset, tslen,
884 delta_type, delta_size, delta_data_offset, delta_buf, delta_len);
888 err = search_packidx(&packidx, &idx, repo, &id);
892 base_offset = get_object_offset(packidx, idx);
893 if (base_offset == (uint64_t)-1) {
894 return got_error(GOT_ERR_BAD_PACKIDX);
897 err = get_packfile_path(&path_base_packfile, repo, packidx);
901 base_pack = get_cached_pack(path_base_packfile, repo);
902 if (base_pack == NULL) {
903 err = cache_pack(&base_pack, path_base_packfile, NULL, repo);
908 if (fseeko(base_pack->packfile, base_offset, SEEK_SET) != 0) {
909 err = got_error_from_errno();
913 err = parse_object_type_and_size(&base_type, &base_size, &base_tslen,
914 base_pack->packfile);
918 err = resolve_delta_chain(deltas, repo, base_pack->packfile,
919 path_base_packfile, base_offset, base_tslen, base_type,
922 free(path_base_packfile);
926 static const struct got_error *
927 resolve_delta_chain(struct got_delta_chain *deltas, struct got_repository *repo,
928 FILE *packfile, const char *path_packfile, off_t delta_offset, size_t tslen,
929 int delta_type, size_t delta_size)
931 const struct got_error *err = NULL;
933 switch (delta_type) {
934 case GOT_OBJ_TYPE_COMMIT:
935 case GOT_OBJ_TYPE_TREE:
936 case GOT_OBJ_TYPE_BLOB:
937 case GOT_OBJ_TYPE_TAG:
938 /* Plain types are the final delta base. Recursion ends. */
939 err = add_delta(deltas, path_packfile, delta_offset, tslen,
940 delta_type, delta_size, 0, NULL, 0);
942 case GOT_OBJ_TYPE_OFFSET_DELTA:
943 err = resolve_offset_delta(deltas, repo, packfile,
944 path_packfile, delta_offset, tslen, delta_type,
947 case GOT_OBJ_TYPE_REF_DELTA:
948 err = resolve_ref_delta(deltas, repo, packfile,
949 path_packfile, delta_offset, tslen, delta_type,
953 return got_error(GOT_ERR_NOT_IMPL);
959 static const struct got_error *
960 open_delta_object(struct got_object **obj, struct got_repository *repo,
961 struct got_packidx_v2_hdr *packidx, const char *path_packfile,
962 FILE *packfile, struct got_object_id *id, off_t offset, size_t tslen,
963 int delta_type, size_t delta_size)
965 const struct got_error *err = NULL;
968 *obj = calloc(1, sizeof(**obj));
970 return got_error(GOT_ERR_NO_MEM);
974 (*obj)->size = 0; /* Not known because deltas aren't applied yet. */
975 memcpy(&(*obj)->id, id, sizeof((*obj)->id));
976 (*obj)->pack_offset = offset + tslen;
978 (*obj)->path_packfile = strdup(path_packfile);
979 if ((*obj)->path_packfile == NULL) {
980 err = got_error(GOT_ERR_NO_MEM);
983 (*obj)->flags |= GOT_OBJ_FLAG_PACKED;
985 SIMPLEQ_INIT(&(*obj)->deltas.entries);
986 (*obj)->flags |= GOT_OBJ_FLAG_DELTIFIED;
988 err = resolve_delta_chain(&(*obj)->deltas, repo, packfile,
989 path_packfile, offset, tslen, delta_type, delta_size);
993 err = got_delta_chain_get_base_type(&resolved_type, &(*obj)->deltas);
996 (*obj)->type = resolved_type;
1000 got_object_close(*obj);
1006 static const struct got_error *
1007 open_packed_object(struct got_object **obj, struct got_repository *repo,
1008 struct got_packidx_v2_hdr *packidx, int idx, struct got_object_id *id)
1010 const struct got_error *err = NULL;
1012 char *path_packfile;
1013 struct got_pack *pack;
1020 offset = get_object_offset(packidx, idx);
1021 if (offset == (uint64_t)-1)
1022 return got_error(GOT_ERR_BAD_PACKIDX);
1024 err = get_packfile_path(&path_packfile, repo, packidx);
1028 pack = get_cached_pack(path_packfile, repo);
1030 err = cache_pack(&pack, path_packfile, packidx, repo);
1035 if (fseeko(pack->packfile, offset, SEEK_SET) != 0) {
1036 err = got_error_from_errno();
1040 err = parse_object_type_and_size(&type, &size, &tslen, pack->packfile);
1045 case GOT_OBJ_TYPE_COMMIT:
1046 case GOT_OBJ_TYPE_TREE:
1047 case GOT_OBJ_TYPE_BLOB:
1048 case GOT_OBJ_TYPE_TAG:
1049 err = open_plain_object(obj, path_packfile, id, type,
1050 offset + tslen, size);
1053 case GOT_OBJ_TYPE_OFFSET_DELTA:
1054 case GOT_OBJ_TYPE_REF_DELTA:
1055 err = open_delta_object(obj, repo, packidx, path_packfile,
1056 pack->packfile, id, offset, tslen, type, size);
1060 err = got_error(GOT_ERR_NOT_IMPL);
1064 free(path_packfile);
1068 const struct got_error *
1069 got_packfile_open_object(struct got_object **obj, struct got_object_id *id,
1070 struct got_repository *repo)
1072 const struct got_error *err = NULL;
1073 struct got_packidx_v2_hdr *packidx = NULL;
1076 err = search_packidx(&packidx, &idx, repo, id);
1080 err = open_packed_object(obj, repo, packidx, idx, id);
1084 err = cache_pack(NULL, (*obj)->path_packfile, packidx, repo);
1088 static const struct got_error *
1089 get_delta_chain_max_size(uint64_t *max_size, struct got_delta_chain *deltas)
1091 struct got_delta *delta;
1092 uint64_t base_size = 0, result_size = 0;
1095 SIMPLEQ_FOREACH(delta, &deltas->entries, entry) {
1096 /* Plain object types are the delta base. */
1097 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1098 delta->type != GOT_OBJ_TYPE_TREE &&
1099 delta->type != GOT_OBJ_TYPE_BLOB &&
1100 delta->type != GOT_OBJ_TYPE_TAG) {
1101 const struct got_error *err;
1102 err = got_delta_get_sizes(&base_size, &result_size,
1103 delta->delta_buf, delta->delta_len);
1107 base_size = delta->size;
1108 if (base_size > *max_size)
1109 *max_size = base_size;
1110 if (result_size > *max_size)
1111 *max_size = result_size;
1117 static const struct got_error *
1118 dump_delta_chain_to_file(size_t *result_size, struct got_delta_chain *deltas,
1119 FILE *outfile, struct got_pack *pack, struct got_repository *repo)
1121 const struct got_error *err = NULL;
1122 struct got_delta *delta;
1123 FILE *base_file = NULL, *accum_file = NULL;
1124 uint8_t *base_buf = NULL, *accum_buf = NULL;
1125 size_t accum_size = 0;
1131 if (SIMPLEQ_EMPTY(&deltas->entries))
1132 return got_error(GOT_ERR_BAD_DELTA_CHAIN);
1134 /* We process small enough files entirely in memory for speed. */
1135 err = get_delta_chain_max_size(&max_size, deltas);
1138 if (max_size < GOT_DELTA_RESULT_SIZE_CACHED_MAX) {
1139 accum_buf = malloc(max_size);
1140 if (accum_buf == NULL)
1141 return got_error(GOT_ERR_NO_MEM);
1143 base_file = got_opentemp();
1144 if (base_file == NULL)
1145 return got_error_from_errno();
1147 accum_file = got_opentemp();
1148 if (accum_file == NULL) {
1149 err = got_error_from_errno();
1155 /* Deltas are ordered in ascending order. */
1156 SIMPLEQ_FOREACH(delta, &deltas->entries, entry) {
1160 /* Plain object types are the delta base. */
1161 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1162 delta->type != GOT_OBJ_TYPE_TREE &&
1163 delta->type != GOT_OBJ_TYPE_BLOB &&
1164 delta->type != GOT_OBJ_TYPE_TAG) {
1165 err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1169 if (fseeko(pack->packfile, delta->offset + delta->tslen,
1171 err = got_error_from_errno();
1175 err = got_inflate_to_file(&base_len,
1176 pack->packfile, base_file);
1178 err = got_inflate_to_mem(&base_buf, &base_len,
1180 if (base_len < max_size) {
1182 p = reallocarray(base_buf, 1, max_size);
1184 err = got_error(GOT_ERR_NO_MEM);
1199 err = got_delta_apply_in_mem(base_buf, delta->delta_buf,
1200 delta->delta_len, accum_buf, &accum_size);
1203 err = got_delta_apply(base_file, delta->delta_buf,
1205 /* Final delta application writes to output file. */
1206 ++n < deltas->nentries ? accum_file : outfile,
1212 if (n < deltas->nentries) {
1213 /* Accumulated delta becomes the new base. */
1215 uint8_t *tmp = accum_buf;
1216 accum_buf = base_buf;
1219 FILE *tmp = accum_file;
1220 accum_file = base_file;
1231 size_t len = fwrite(accum_buf, 1, accum_size, outfile);
1233 if (len != accum_size)
1234 return got_ferror(outfile, GOT_ERR_IO);
1242 *result_size = accum_size;
1246 static const struct got_error *
1247 dump_delta_chain_to_mem(uint8_t **outbuf, size_t *outlen,
1248 struct got_delta_chain *deltas, struct got_pack *pack,
1249 struct got_repository *repo)
1251 const struct got_error *err = NULL;
1252 struct got_delta *delta;
1253 uint8_t *base_buf = NULL, *accum_buf = NULL;
1261 if (SIMPLEQ_EMPTY(&deltas->entries))
1262 return got_error(GOT_ERR_BAD_DELTA_CHAIN);
1264 err = get_delta_chain_max_size(&max_size, deltas);
1267 accum_buf = malloc(max_size);
1268 if (accum_buf == NULL)
1269 return got_error(GOT_ERR_NO_MEM);
1271 /* Deltas are ordered in ascending order. */
1272 SIMPLEQ_FOREACH(delta, &deltas->entries, entry) {
1276 /* Plain object types are the delta base. */
1277 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1278 delta->type != GOT_OBJ_TYPE_TREE &&
1279 delta->type != GOT_OBJ_TYPE_BLOB &&
1280 delta->type != GOT_OBJ_TYPE_TAG) {
1281 err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1285 if (fseeko(pack->packfile, delta->offset + delta->tslen,
1287 err = got_error_from_errno();
1290 err = got_inflate_to_mem(&base_buf, &base_len,
1292 if (base_len < max_size) {
1294 p = reallocarray(base_buf, 1, max_size);
1296 err = got_error(GOT_ERR_NO_MEM);
1307 err = got_delta_apply_in_mem(base_buf, delta->delta_buf,
1308 delta->delta_len, accum_buf, &accum_size);
1313 if (n < deltas->nentries) {
1314 /* Accumulated delta becomes the new base. */
1315 uint8_t *tmp = accum_buf;
1316 accum_buf = base_buf;
1328 *outbuf = accum_buf;
1329 *outlen = accum_size;
1334 const struct got_error *
1335 got_packfile_extract_object(FILE **f, struct got_object *obj,
1336 struct got_repository *repo)
1338 const struct got_error *err = NULL;
1339 struct got_pack *pack;
1341 if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
1342 return got_error(GOT_ERR_OBJ_NOT_PACKED);
1344 pack = get_cached_pack(obj->path_packfile, repo);
1346 err = cache_pack(&pack, obj->path_packfile, NULL, repo);
1351 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0) {
1352 if (fseeko(pack->packfile, obj->pack_offset, SEEK_SET) != 0) {
1353 err = got_error_from_errno();
1357 if (obj->size < GOT_DELTA_RESULT_SIZE_CACHED_MAX) {
1358 size_t size = obj->size;
1359 if (size == 0) /* empty file */
1361 *f = fmemopen(NULL, size, "w+");
1363 *f = got_opentemp();
1365 err = got_error(GOT_ERR_FILE_OPEN);
1368 err = got_inflate_to_file(&obj->size, pack->packfile, *f);
1372 err = get_delta_chain_max_size(&max_size, &obj->deltas);
1375 if (max_size < GOT_DELTA_RESULT_SIZE_CACHED_MAX)
1376 *f = fmemopen(NULL, max_size, "w+");
1378 *f = got_opentemp();
1380 err = got_error(GOT_ERR_FILE_OPEN);
1383 err = dump_delta_chain_to_file(&obj->size, &obj->deltas, *f,
1394 const struct got_error *
1395 got_packfile_extract_object_to_mem(uint8_t **buf, size_t *len,
1396 struct got_object *obj, struct got_repository *repo)
1398 const struct got_error *err = NULL;
1399 FILE *packfile = NULL;
1400 struct got_pack *pack;
1402 if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
1403 return got_error(GOT_ERR_OBJ_NOT_PACKED);
1405 pack = get_cached_pack(obj->path_packfile, repo);
1407 err = cache_pack(&pack, obj->path_packfile, NULL, repo);
1412 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0) {
1413 if (fseeko(pack->packfile, obj->pack_offset, SEEK_SET) != 0) {
1414 err = got_error_from_errno();
1418 err = got_inflate_to_mem(buf, len, pack->packfile);
1420 err = dump_delta_chain_to_mem(buf, len, &obj->deltas, pack,