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>
32 #include "got_error.h"
33 #include "got_object.h"
34 #include "got_repository.h"
36 #include "got_sha1_lib.h"
37 #include "got_pack_lib.h"
38 #include "got_path_lib.h"
39 #include "got_delta_lib.h"
40 #include "got_zbuf_lib.h"
41 #include "got_object_lib.h"
42 #include "got_repository_lib.h"
45 #define nitems(_a) (sizeof(_a) / sizeof((_a)[0]))
48 #define GOT_PACK_PREFIX "pack-"
49 #define GOT_PACKFILE_SUFFIX ".pack"
50 #define GOT_PACKIDX_SUFFIX ".idx"
51 #define GOT_PACKFILE_NAMELEN (strlen(GOT_PACK_PREFIX) + \
52 SHA1_DIGEST_STRING_LENGTH - 1 + \
53 strlen(GOT_PACKFILE_SUFFIX))
54 #define GOT_PACKIDX_NAMELEN (strlen(GOT_PACK_PREFIX) + \
55 SHA1_DIGEST_STRING_LENGTH - 1 + \
56 strlen(GOT_PACKIDX_SUFFIX))
59 #define MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
62 static const struct got_error *
63 verify_fanout_table(uint32_t *fanout_table)
67 for (i = 0; i < 0xff - 1; i++) {
68 if (be32toh(fanout_table[i]) > be32toh(fanout_table[i + 1]))
69 return got_error(GOT_ERR_BAD_PACKIDX);
75 static const struct got_error *
76 get_packfile_size(size_t *size, const char *path_idx)
80 char base_path[PATH_MAX];
83 if (strlcpy(base_path, path_idx, PATH_MAX) > PATH_MAX)
84 return got_error(GOT_ERR_NO_SPACE);
86 dot = strrchr(base_path, '.');
88 return got_error(GOT_ERR_BAD_PATH);
90 if (asprintf(&path_pack, "%s.pack", base_path) == -1)
91 return got_error(GOT_ERR_NO_MEM);
93 if (stat(path_pack, &sb) != 0) {
95 return got_error_from_errno();
103 const struct got_error *
104 got_packidx_open(struct got_packidx_v2_hdr **packidx, const char *path)
106 struct got_packidx_v2_hdr *p;
108 const struct got_error *err = NULL;
109 size_t n, nobj, packfile_size;
111 uint8_t sha1[SHA1_DIGEST_LENGTH];
115 f = fopen(path, "rb");
117 return got_error(GOT_ERR_BAD_PATH);
119 err = get_packfile_size(&packfile_size, path);
123 p = calloc(1, sizeof(*p));
125 err = got_error(GOT_ERR_NO_MEM);
129 n = fread(&p->magic, sizeof(p->magic), 1, f);
131 err = got_ferror(f, GOT_ERR_BAD_PACKIDX);
135 if (betoh32(p->magic) != GOT_PACKIDX_V2_MAGIC) {
136 err = got_error(GOT_ERR_BAD_PACKIDX);
140 SHA1Update(&ctx, (uint8_t *)&p->magic, sizeof(p->magic));
142 n = fread(&p->version, sizeof(p->version), 1, f);
144 err = got_ferror(f, GOT_ERR_BAD_PACKIDX);
148 if (betoh32(p->version) != GOT_PACKIDX_VERSION) {
149 err = got_error(GOT_ERR_BAD_PACKIDX);
153 SHA1Update(&ctx, (uint8_t *)&p->version, sizeof(p->version));
155 n = fread(&p->fanout_table, sizeof(p->fanout_table), 1, f);
157 err = got_ferror(f, GOT_ERR_BAD_PACKIDX);
161 err = verify_fanout_table(p->fanout_table);
165 SHA1Update(&ctx, (uint8_t *)p->fanout_table, sizeof(p->fanout_table));
167 nobj = betoh32(p->fanout_table[0xff]);
169 p->sorted_ids = calloc(nobj, sizeof(*p->sorted_ids));
170 if (p->sorted_ids == NULL) {
171 err = got_error(GOT_ERR_NO_MEM);
175 n = fread(p->sorted_ids, sizeof(*p->sorted_ids), nobj, f);
177 err = got_ferror(f, GOT_ERR_BAD_PACKIDX);
181 SHA1Update(&ctx, (uint8_t *)p->sorted_ids,
182 nobj * sizeof(*p->sorted_ids));
184 p->crc32 = calloc(nobj, sizeof(*p->crc32));
185 if (p->crc32 == NULL) {
186 err = got_error(GOT_ERR_NO_MEM);
190 n = fread(p->crc32, sizeof(*p->crc32), nobj, f);
192 err = got_ferror(f, GOT_ERR_BAD_PACKIDX);
196 SHA1Update(&ctx, (uint8_t *)p->crc32, nobj * sizeof(*p->crc32));
198 p->offsets = calloc(nobj, sizeof(*p->offsets));
199 if (p->offsets == NULL) {
200 err = got_error(GOT_ERR_NO_MEM);
204 n = fread(p->offsets, sizeof(*p->offsets), nobj, f);
206 err = got_ferror(f, GOT_ERR_BAD_PACKIDX);
210 SHA1Update(&ctx, (uint8_t *)p->offsets, nobj * sizeof(*p->offsets));
212 /* Large file offsets are contained only in files > 2GB. */
213 if (packfile_size <= 0x80000000)
216 p->large_offsets = calloc(nobj, sizeof(*p->large_offsets));
217 if (p->large_offsets == NULL) {
218 err = got_error(GOT_ERR_NO_MEM);
222 n = fread(p->large_offsets, sizeof(*p->large_offsets), nobj, f);
224 err = got_ferror(f, GOT_ERR_BAD_PACKIDX);
228 SHA1Update(&ctx, (uint8_t*)p->large_offsets,
229 nobj * sizeof(*p->large_offsets));
232 n = fread(&p->trailer, sizeof(p->trailer), 1, f);
234 err = got_ferror(f, GOT_ERR_BAD_PACKIDX);
238 SHA1Update(&ctx, p->trailer.packfile_sha1, SHA1_DIGEST_LENGTH);
239 SHA1Final(sha1, &ctx);
240 if (memcmp(p->trailer.packidx_sha1, sha1, SHA1_DIGEST_LENGTH) != 0)
241 err = got_error(GOT_ERR_PACKIDX_CSUM);
245 got_packidx_close(p);
252 got_packidx_close(struct got_packidx_v2_hdr *packidx)
254 free(packidx->sorted_ids);
255 free(packidx->offsets);
256 free(packidx->crc32);
257 free(packidx->large_offsets);
262 is_packidx_filename(const char *name, size_t len)
264 if (len != GOT_PACKIDX_NAMELEN)
267 if (strncmp(name, GOT_PACK_PREFIX, strlen(GOT_PACK_PREFIX)) != 0)
270 if (strcmp(name + strlen(GOT_PACK_PREFIX) +
271 SHA1_DIGEST_STRING_LENGTH - 1, GOT_PACKIDX_SUFFIX) != 0)
278 get_object_offset(struct got_packidx_v2_hdr *packidx, int idx)
280 uint32_t totobj = betoh32(packidx->fanout_table[0xff]);
281 uint32_t offset = betoh32(packidx->offsets[idx]);
282 if (offset & GOT_PACKIDX_OFFSET_VAL_IS_LARGE_IDX) {
284 idx = offset & GOT_PACKIDX_OFFSET_VAL_MASK;
285 if (idx < 0 || idx > totobj || packidx->large_offsets == NULL)
287 loffset = betoh64(packidx->large_offsets[idx]);
288 return (loffset > INT64_MAX ? -1 : (off_t)loffset);
290 return (off_t)(offset & GOT_PACKIDX_OFFSET_VAL_MASK);
294 get_object_idx(struct got_packidx_v2_hdr *packidx, struct got_object_id *id)
296 u_int8_t id0 = id->sha1[0];
297 uint32_t totobj = betoh32(packidx->fanout_table[0xff]);
301 i = betoh32(packidx->fanout_table[id0 - 1]);
304 struct got_object_id *oid = &packidx->sorted_ids[i];
305 int cmp = got_object_id_cmp(id, oid);
315 static struct got_packidx_v2_hdr *
316 dup_packidx(struct got_packidx_v2_hdr *packidx)
318 struct got_packidx_v2_hdr *p;
321 p = calloc(1, sizeof(*p));
325 memcpy(p, packidx, sizeof(*p));
326 p->sorted_ids = NULL;
329 p->large_offsets = NULL;
331 nobj = betoh32(p->fanout_table[0xff]);
333 p->sorted_ids = calloc(nobj, sizeof(*p->sorted_ids));
334 if (p->sorted_ids == NULL)
336 memcpy(p->sorted_ids, packidx->sorted_ids, nobj * sizeof(*p->sorted_ids));
338 p->crc32 = calloc(nobj, sizeof(*p->crc32));
339 if (p->crc32 == NULL)
341 memcpy(p->crc32, packidx->crc32, nobj * sizeof(*p->crc32));
343 p->offsets = calloc(nobj, sizeof(*p->offsets));
344 if (p->offsets == NULL)
346 memcpy(p->offsets, packidx->offsets, nobj * sizeof(*p->offsets));
348 if (p->large_offsets) {
349 p->large_offsets = calloc(nobj, sizeof(*p->large_offsets));
350 if (p->large_offsets == NULL)
352 memcpy(p->large_offsets, packidx->large_offsets,
353 nobj * sizeof(*p->large_offsets));
359 free(p->large_offsets);
368 cache_packidx(struct got_packidx_v2_hdr *packidx, struct got_repository *repo)
372 for (i = 0; i < nitems(repo->packidx_cache); i++) {
373 if (repo->packidx_cache[i] == NULL)
377 if (i == nitems(repo->packidx_cache)) {
378 got_packidx_close(repo->packidx_cache[i - 1]);
379 memmove(&repo->packidx_cache[1], &repo->packidx_cache[0],
380 sizeof(repo->packidx_cache) -
381 sizeof(repo->packidx_cache[0]));
385 repo->packidx_cache[i] = dup_packidx(packidx);
388 static const struct got_error *
389 search_packidx(struct got_packidx_v2_hdr **packidx, int *idx,
390 struct got_repository *repo, struct got_object_id *id)
392 const struct got_error *err;
399 /* Search pack index cache. */
400 for (i = 0; i < nitems(repo->packidx_cache); i++) {
401 if (repo->packidx_cache[i] == NULL)
403 *idx = get_object_idx(repo->packidx_cache[i], id);
405 *packidx = dup_packidx(repo->packidx_cache[i]);
406 if (*packidx == NULL)
407 return got_error(GOT_ERR_NO_MEM);
411 /* No luck. Search the filesystem. */
413 path_packdir = got_repo_get_path_objects_pack(repo);
414 if (path_packdir == NULL)
415 return got_error(GOT_ERR_NO_MEM);
417 packdir = opendir(path_packdir);
418 if (packdir == NULL) {
419 err = got_error_from_errno();
423 while ((dent = readdir(packdir)) != NULL) {
424 if (!is_packidx_filename(dent->d_name, dent->d_namlen))
427 if (asprintf(&path_packidx, "%s/%s", path_packdir,
428 dent->d_name) == -1) {
429 err = got_error(GOT_ERR_NO_MEM);
433 err = got_packidx_open(packidx, path_packidx);
438 *idx = get_object_idx(*packidx, id);
440 err = NULL; /* found the object */
441 cache_packidx(*packidx, repo);
445 got_packidx_close(*packidx);
449 err = got_error(GOT_ERR_NO_OBJ);
452 if (packdir && closedir(packdir) != 0 && err == 0)
453 err = got_error_from_errno();
457 static const struct got_error *
458 get_packfile_path(char **path_packfile, struct got_repository *repo,
459 struct got_packidx_v2_hdr *packidx)
462 char hex[SHA1_DIGEST_STRING_LENGTH];
465 path_packdir = got_repo_get_path_objects_pack(repo);
466 if (path_packdir == NULL)
467 return got_error(GOT_ERR_NO_MEM);
469 sha1str = got_sha1_digest_to_str(packidx->trailer.packfile_sha1,
472 return got_error(GOT_ERR_PACKIDX_CSUM);
474 if (asprintf(path_packfile, "%s/%s%s%s", path_packdir,
475 GOT_PACK_PREFIX, sha1str, GOT_PACKFILE_SUFFIX) == -1) {
476 *path_packfile = NULL;
477 return got_error(GOT_ERR_NO_MEM);
483 const struct got_error *
484 read_packfile_hdr(FILE *f, struct got_packidx_v2_hdr *packidx)
486 const struct got_error *err = NULL;
487 uint32_t totobj = betoh32(packidx->fanout_table[0xff]);
488 struct got_packfile_hdr hdr;
491 n = fread(&hdr, sizeof(hdr), 1, f);
493 return got_ferror(f, GOT_ERR_BAD_PACKIDX);
495 if (betoh32(hdr.signature) != GOT_PACKFILE_SIGNATURE ||
496 betoh32(hdr.version) != GOT_PACKFILE_VERSION ||
497 betoh32(hdr.nobjects) != totobj)
498 err = got_error(GOT_ERR_BAD_PACKFILE);
503 static const struct got_error *
504 open_packfile(FILE **packfile, char **path_packfile,
505 struct got_repository *repo, struct got_packidx_v2_hdr *packidx)
507 const struct got_error *err;
511 err = get_packfile_path(path_packfile, repo, packidx);
515 *packfile = fopen(*path_packfile, "rb");
516 if (*packfile == NULL) {
517 err = got_error_from_errno();
518 free(*path_packfile);
522 err = read_packfile_hdr(*packfile, packidx);
530 static const struct got_error *
531 parse_object_type_and_size(uint8_t *type, uint64_t *size, size_t *len,
541 /* We do not support size values which don't fit in 64 bit. */
543 return got_error(GOT_ERR_NO_SPACE);
545 n = fread(&sizeN, sizeof(sizeN), 1, packfile);
547 return got_ferror(packfile, GOT_ERR_BAD_PACKIDX);
550 t = (sizeN & GOT_PACK_OBJ_SIZE0_TYPE_MASK) >>
551 GOT_PACK_OBJ_SIZE0_TYPE_MASK_SHIFT;
552 s = (sizeN & GOT_PACK_OBJ_SIZE0_VAL_MASK);
554 size_t shift = 4 + 7 * (i - 1);
555 s |= ((sizeN & GOT_PACK_OBJ_SIZE_VAL_MASK) << shift);
558 } while (sizeN & GOT_PACK_OBJ_SIZE_MORE);
562 *len = i * sizeof(sizeN);
566 static const struct got_error *
567 open_plain_object(struct got_object **obj, const char *path_packfile,
568 struct got_object_id *id, uint8_t type, off_t offset, size_t size)
570 *obj = calloc(1, sizeof(**obj));
572 return got_error(GOT_ERR_NO_MEM);
574 (*obj)->path_packfile = strdup(path_packfile);
575 if ((*obj)->path_packfile == NULL) {
578 return got_error(GOT_ERR_NO_MEM);
582 (*obj)->flags = GOT_OBJ_FLAG_PACKED;
585 memcpy(&(*obj)->id, id, sizeof((*obj)->id));
586 (*obj)->pack_offset = offset;
591 static const struct got_error *
592 parse_negative_offset(int64_t *offset, size_t *len, FILE *packfile)
600 /* We do not support offset values which don't fit in 64 bit. */
602 return got_error(GOT_ERR_NO_SPACE);
604 n = fread(&offN, sizeof(offN), 1, packfile);
606 return got_ferror(packfile, GOT_ERR_BAD_PACKIDX);
609 o = (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
613 o += (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
616 } while (offN & GOT_PACK_OBJ_DELTA_OFF_MORE);
619 *len = i * sizeof(offN);
623 static const struct got_error *
624 parse_offset_delta(off_t *base_offset, FILE *packfile, off_t offset)
626 const struct got_error *err;
630 err = parse_negative_offset(&negoffset, &negofflen, packfile);
634 /* Compute the base object's offset (must be in the same pack file). */
635 *base_offset = (offset - negoffset);
636 if (*base_offset <= 0)
637 return got_error(GOT_ERR_BAD_PACKFILE);
642 static const struct got_error *
643 resolve_delta_chain(struct got_delta_chain *, struct got_repository *,
644 FILE *, const char *, off_t, size_t, int, size_t);
646 static const struct got_error *
647 add_delta(struct got_delta_chain *deltas, const char *path_packfile,
648 off_t delta_offset, size_t tslen, int delta_type, size_t delta_size,
649 size_t delta_data_offset)
651 struct got_delta *delta;
653 delta = got_delta_open(path_packfile, delta_offset, tslen,
654 delta_type, delta_size, delta_data_offset);
656 return got_error(GOT_ERR_NO_MEM);
657 /* delta is freed in got_object_close() */
659 SIMPLEQ_INSERT_HEAD(&deltas->entries, delta, entry);
663 static const struct got_error *
664 resolve_offset_delta(struct got_delta_chain *deltas,
665 struct got_repository *repo, FILE *packfile, const char *path_packfile,
666 off_t delta_offset,size_t tslen, int delta_type, size_t delta_size)
669 const struct got_error *err;
674 off_t delta_data_offset;
676 err = parse_offset_delta(&base_offset, packfile, delta_offset);
680 delta_data_offset = ftello(packfile);
681 if (delta_data_offset == -1)
682 return got_error_from_errno();
684 err = add_delta(deltas, path_packfile, delta_offset, tslen,
685 delta_type, delta_size, delta_data_offset);
689 /* An offset delta must be in the same packfile. */
690 if (fseeko(packfile, base_offset, SEEK_SET) != 0)
691 return got_error_from_errno();
693 err = parse_object_type_and_size(&base_type, &base_size, &base_tslen,
698 return resolve_delta_chain(deltas, repo, packfile, path_packfile,
699 base_offset, base_tslen, base_type, base_size);
702 static const struct got_error *
703 resolve_ref_delta(struct got_delta_chain *deltas, struct got_repository *repo,
704 FILE *packfile, const char *path_packfile, off_t delta_offset,
705 size_t tslen, int delta_type, size_t delta_size)
707 const struct got_error *err;
708 struct got_object_id id;
709 struct got_packidx_v2_hdr *packidx;
717 char *path_base_packfile;
718 off_t delta_data_offset;
720 n = fread(&id, sizeof(id), 1, packfile);
722 return got_ferror(packfile, GOT_ERR_IO);
724 delta_data_offset = ftello(packfile);
725 if (delta_data_offset == -1)
726 return got_error_from_errno();
728 err = add_delta(deltas, path_packfile, delta_offset, tslen,
729 delta_type, delta_size, delta_data_offset);
733 err = search_packidx(&packidx, &idx, repo, &id);
737 base_offset = get_object_offset(packidx, idx);
738 if (base_offset == (uint64_t)-1) {
739 got_packidx_close(packidx);
740 return got_error(GOT_ERR_BAD_PACKIDX);
743 err = open_packfile(&base_packfile, &path_base_packfile, repo, packidx);
744 got_packidx_close(packidx);
748 if (fseeko(base_packfile, base_offset, SEEK_SET) != 0) {
749 err = got_error_from_errno();
753 err = parse_object_type_and_size(&base_type, &base_size, &base_tslen,
758 err = resolve_delta_chain(deltas, repo, base_packfile,
759 path_base_packfile, base_offset, base_tslen, base_type,
762 free(path_base_packfile);
763 if (base_packfile && fclose(base_packfile) == -1 && err == 0)
764 err = got_error_from_errno();
768 static const struct got_error *
769 resolve_delta_chain(struct got_delta_chain *deltas, struct got_repository *repo,
770 FILE *packfile, const char *path_packfile, off_t delta_offset, size_t tslen,
771 int delta_type, size_t delta_size)
773 const struct got_error *err = NULL;
775 switch (delta_type) {
776 case GOT_OBJ_TYPE_COMMIT:
777 case GOT_OBJ_TYPE_TREE:
778 case GOT_OBJ_TYPE_BLOB:
779 case GOT_OBJ_TYPE_TAG:
780 /* Plain types are the final delta base. Recursion ends. */
781 err = add_delta(deltas, path_packfile, delta_offset, tslen,
782 delta_type, delta_size, 0);
784 case GOT_OBJ_TYPE_OFFSET_DELTA:
785 err = resolve_offset_delta(deltas, repo, packfile,
786 path_packfile, delta_offset, tslen, delta_type,
789 case GOT_OBJ_TYPE_REF_DELTA:
790 err = resolve_ref_delta(deltas, repo, packfile,
791 path_packfile, delta_offset, tslen, delta_type,
795 return got_error(GOT_ERR_NOT_IMPL);
801 static const struct got_error *
802 open_delta_object(struct got_object **obj, struct got_repository *repo,
803 struct got_packidx_v2_hdr *packidx, const char *path_packfile,
804 FILE *packfile, struct got_object_id *id, off_t offset, size_t tslen,
805 int delta_type, size_t delta_size)
807 const struct got_error *err = NULL;
810 *obj = calloc(1, sizeof(**obj));
812 return got_error(GOT_ERR_NO_MEM);
816 (*obj)->size = 0; /* Not known because deltas aren't applied yet. */
817 memcpy(&(*obj)->id, id, sizeof((*obj)->id));
818 (*obj)->pack_offset = offset + tslen;
820 (*obj)->path_packfile = strdup(path_packfile);
821 if ((*obj)->path_packfile == NULL) {
822 err = got_error(GOT_ERR_NO_MEM);
825 (*obj)->flags |= GOT_OBJ_FLAG_PACKED;
827 SIMPLEQ_INIT(&(*obj)->deltas.entries);
828 (*obj)->flags |= GOT_OBJ_FLAG_DELTIFIED;
830 err = resolve_delta_chain(&(*obj)->deltas, repo, packfile,
831 path_packfile, offset, tslen, delta_type, delta_size);
835 err = got_delta_chain_get_base_type(&resolved_type, &(*obj)->deltas);
838 (*obj)->type = resolved_type;
842 got_object_close(*obj);
848 static const struct got_error *
849 open_packed_object(struct got_object **obj, struct got_repository *repo,
850 struct got_packidx_v2_hdr *packidx, int idx, struct got_object_id *id)
852 const struct got_error *err = NULL;
862 offset = get_object_offset(packidx, idx);
863 if (offset == (uint64_t)-1)
864 return got_error(GOT_ERR_BAD_PACKIDX);
866 err = open_packfile(&packfile, &path_packfile, repo, packidx);
870 if (fseeko(packfile, offset, SEEK_SET) != 0) {
871 err = got_error_from_errno();
875 err = parse_object_type_and_size(&type, &size, &tslen, packfile);
880 case GOT_OBJ_TYPE_COMMIT:
881 case GOT_OBJ_TYPE_TREE:
882 case GOT_OBJ_TYPE_BLOB:
883 case GOT_OBJ_TYPE_TAG:
884 err = open_plain_object(obj, path_packfile, id, type,
885 offset + tslen, size);
888 case GOT_OBJ_TYPE_OFFSET_DELTA:
889 case GOT_OBJ_TYPE_REF_DELTA:
890 err = open_delta_object(obj, repo, packidx, path_packfile,
891 packfile, id, offset, tslen, type, size);
895 err = got_error(GOT_ERR_NOT_IMPL);
900 if (packfile && fclose(packfile) == -1 && err == 0)
901 err = got_error_from_errno();
905 const struct got_error *
906 got_packfile_open_object(struct got_object **obj, struct got_object_id *id,
907 struct got_repository *repo)
909 const struct got_error *err = NULL;
910 struct got_packidx_v2_hdr *packidx = NULL;
913 err = search_packidx(&packidx, &idx, repo, id);
917 err = open_packed_object(obj, repo, packidx, idx, id);
918 got_packidx_close(packidx);
922 static const struct got_error *
923 dump_delta_chain(struct got_delta_chain *deltas, FILE *outfile)
925 const struct got_error *err = NULL;
926 struct got_delta *delta;
927 FILE *base_file, *accum_file;
930 if (SIMPLEQ_EMPTY(&deltas->entries))
931 return got_error(GOT_ERR_BAD_DELTA_CHAIN);
933 base_file = got_opentemp();
934 if (base_file == NULL)
935 return got_error_from_errno();
937 accum_file = got_opentemp();
938 if (accum_file == NULL) {
939 err = got_error_from_errno();
944 /* Deltas are ordered in ascending order. */
945 SIMPLEQ_FOREACH(delta, &deltas->entries, entry) {
946 uint8_t *delta_buf = NULL;
947 size_t delta_len = 0;
950 delta_file = fopen(delta->path_packfile, "rb");
951 if (delta_file == NULL) {
952 err = got_error_from_errno();
958 /* Plain object types are the delta base. */
959 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
960 delta->type != GOT_OBJ_TYPE_TREE &&
961 delta->type != GOT_OBJ_TYPE_BLOB &&
962 delta->type != GOT_OBJ_TYPE_TAG) {
963 err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
967 if (fseeko(delta_file, delta->offset + delta->tslen,
970 err = got_error_from_errno();
973 err = got_inflate_to_file(&delta_len, delta_file,
983 if (fseeko(delta_file, delta->data_offset, SEEK_CUR) != 0) {
985 err = got_error_from_errno();
989 /* Delta streams should always fit in memory. */
990 err = got_inflate_to_mem(&delta_buf, &delta_len, delta_file);
995 err = got_delta_apply(base_file, delta_buf, delta_len,
996 /* Final delta application writes to the output file. */
997 ++n < deltas->nentries ? accum_file : outfile);
1002 if (n < deltas->nentries) {
1003 /* Accumulated delta becomes the new base. */
1004 FILE *tmp = accum_file;
1005 accum_file = base_file;
1019 const struct got_error *
1020 got_packfile_extract_object(FILE **f, struct got_object *obj,
1021 struct got_repository *repo)
1023 const struct got_error *err = NULL;
1024 FILE *packfile = NULL;
1026 if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
1027 return got_error(GOT_ERR_OBJ_NOT_PACKED);
1029 *f = got_opentemp();
1031 err = got_error(GOT_ERR_FILE_OPEN);
1035 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0) {
1036 packfile = fopen(obj->path_packfile, "rb");
1037 if (packfile == NULL) {
1038 err = got_error_from_errno();
1042 if (fseeko(packfile, obj->pack_offset, SEEK_SET) != 0) {
1043 err = got_error_from_errno();
1047 err = got_inflate_to_file(&obj->size, packfile, *f);
1049 err = dump_delta_chain(&obj->deltas, *f);