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_idx)
81 char base_path[PATH_MAX];
84 if (strlcpy(base_path, path_idx, PATH_MAX) > PATH_MAX)
85 return got_error(GOT_ERR_NO_SPACE);
87 dot = strrchr(base_path, '.');
89 return got_error(GOT_ERR_BAD_PATH);
91 if (asprintf(&path_pack, "%s.pack", base_path) == -1)
92 return got_error_from_errno();
94 if (stat(path_pack, &sb) != 0) {
96 return got_error_from_errno();
104 const struct got_error *
105 got_packidx_open(struct got_packidx_v2_hdr **packidx, const char *path)
107 struct got_packidx_v2_hdr *p;
109 const struct got_error *err = NULL;
110 size_t n, nobj, packfile_size;
112 uint8_t sha1[SHA1_DIGEST_LENGTH];
116 f = fopen(path, "rb");
118 return got_error_from_errno();
120 err = get_packfile_size(&packfile_size, path);
124 p = calloc(1, sizeof(*p));
126 err = got_error_from_errno();
130 n = fread(&p->magic, sizeof(p->magic), 1, f);
132 err = got_ferror(f, GOT_ERR_BAD_PACKIDX);
136 if (betoh32(p->magic) != GOT_PACKIDX_V2_MAGIC) {
137 err = got_error(GOT_ERR_BAD_PACKIDX);
141 SHA1Update(&ctx, (uint8_t *)&p->magic, sizeof(p->magic));
143 n = fread(&p->version, sizeof(p->version), 1, f);
145 err = got_ferror(f, GOT_ERR_BAD_PACKIDX);
149 if (betoh32(p->version) != GOT_PACKIDX_VERSION) {
150 err = got_error(GOT_ERR_BAD_PACKIDX);
154 SHA1Update(&ctx, (uint8_t *)&p->version, sizeof(p->version));
156 n = fread(&p->fanout_table, sizeof(p->fanout_table), 1, f);
158 err = got_ferror(f, GOT_ERR_BAD_PACKIDX);
162 err = verify_fanout_table(p->fanout_table);
166 SHA1Update(&ctx, (uint8_t *)p->fanout_table, sizeof(p->fanout_table));
168 nobj = betoh32(p->fanout_table[0xff]);
170 p->sorted_ids = calloc(nobj, sizeof(*p->sorted_ids));
171 if (p->sorted_ids == NULL) {
172 err = got_error_from_errno();
176 n = fread(p->sorted_ids, sizeof(*p->sorted_ids), nobj, f);
178 err = got_ferror(f, GOT_ERR_BAD_PACKIDX);
182 SHA1Update(&ctx, (uint8_t *)p->sorted_ids,
183 nobj * sizeof(*p->sorted_ids));
185 p->crc32 = calloc(nobj, sizeof(*p->crc32));
186 if (p->crc32 == NULL) {
187 err = got_error_from_errno();
191 n = fread(p->crc32, sizeof(*p->crc32), nobj, f);
193 err = got_ferror(f, GOT_ERR_BAD_PACKIDX);
197 SHA1Update(&ctx, (uint8_t *)p->crc32, nobj * sizeof(*p->crc32));
199 p->offsets = calloc(nobj, sizeof(*p->offsets));
200 if (p->offsets == NULL) {
201 err = got_error_from_errno();
205 n = fread(p->offsets, sizeof(*p->offsets), nobj, f);
207 err = got_ferror(f, GOT_ERR_BAD_PACKIDX);
211 SHA1Update(&ctx, (uint8_t *)p->offsets, nobj * sizeof(*p->offsets));
213 /* Large file offsets are contained only in files > 2GB. */
214 if (packfile_size <= 0x80000000)
217 p->large_offsets = calloc(nobj, sizeof(*p->large_offsets));
218 if (p->large_offsets == NULL) {
219 err = got_error_from_errno();
223 n = fread(p->large_offsets, sizeof(*p->large_offsets), nobj, f);
225 err = got_ferror(f, GOT_ERR_BAD_PACKIDX);
229 SHA1Update(&ctx, (uint8_t*)p->large_offsets,
230 nobj * sizeof(*p->large_offsets));
233 n = fread(&p->trailer, sizeof(p->trailer), 1, f);
235 err = got_ferror(f, GOT_ERR_BAD_PACKIDX);
239 SHA1Update(&ctx, p->trailer.packfile_sha1, SHA1_DIGEST_LENGTH);
240 SHA1Final(sha1, &ctx);
241 if (memcmp(p->trailer.packidx_sha1, sha1, SHA1_DIGEST_LENGTH) != 0)
242 err = got_error(GOT_ERR_PACKIDX_CSUM);
246 got_packidx_close(p);
253 got_packidx_close(struct got_packidx_v2_hdr *packidx)
255 free(packidx->sorted_ids);
256 free(packidx->offsets);
257 free(packidx->crc32);
258 free(packidx->large_offsets);
263 is_packidx_filename(const char *name, size_t len)
265 if (len != GOT_PACKIDX_NAMELEN)
268 if (strncmp(name, GOT_PACK_PREFIX, strlen(GOT_PACK_PREFIX)) != 0)
271 if (strcmp(name + strlen(GOT_PACK_PREFIX) +
272 SHA1_DIGEST_STRING_LENGTH - 1, GOT_PACKIDX_SUFFIX) != 0)
279 get_object_offset(struct got_packidx_v2_hdr *packidx, int idx)
281 uint32_t totobj = betoh32(packidx->fanout_table[0xff]);
282 uint32_t offset = betoh32(packidx->offsets[idx]);
283 if (offset & GOT_PACKIDX_OFFSET_VAL_IS_LARGE_IDX) {
285 idx = offset & GOT_PACKIDX_OFFSET_VAL_MASK;
286 if (idx < 0 || idx > totobj || packidx->large_offsets == NULL)
288 loffset = betoh64(packidx->large_offsets[idx]);
289 return (loffset > INT64_MAX ? -1 : (off_t)loffset);
291 return (off_t)(offset & GOT_PACKIDX_OFFSET_VAL_MASK);
295 get_object_idx(struct got_packidx_v2_hdr *packidx, struct got_object_id *id)
297 u_int8_t id0 = id->sha1[0];
298 uint32_t totobj = betoh32(packidx->fanout_table[0xff]);
302 i = betoh32(packidx->fanout_table[id0 - 1]);
305 struct got_object_id *oid = &packidx->sorted_ids[i];
306 int cmp = got_object_id_cmp(id, oid);
316 static struct got_packidx_v2_hdr *
317 dup_packidx(struct got_packidx_v2_hdr *packidx)
319 struct got_packidx_v2_hdr *p;
322 p = calloc(1, sizeof(*p));
326 memcpy(p, packidx, sizeof(*p));
327 p->sorted_ids = NULL;
330 p->large_offsets = NULL;
332 nobj = betoh32(p->fanout_table[0xff]);
334 p->sorted_ids = calloc(nobj, sizeof(*p->sorted_ids));
335 if (p->sorted_ids == NULL)
337 memcpy(p->sorted_ids, packidx->sorted_ids, nobj * sizeof(*p->sorted_ids));
339 p->crc32 = calloc(nobj, sizeof(*p->crc32));
340 if (p->crc32 == NULL)
342 memcpy(p->crc32, packidx->crc32, nobj * sizeof(*p->crc32));
344 p->offsets = calloc(nobj, sizeof(*p->offsets));
345 if (p->offsets == NULL)
347 memcpy(p->offsets, packidx->offsets, nobj * sizeof(*p->offsets));
349 if (p->large_offsets) {
350 p->large_offsets = calloc(nobj, sizeof(*p->large_offsets));
351 if (p->large_offsets == NULL)
353 memcpy(p->large_offsets, packidx->large_offsets,
354 nobj * sizeof(*p->large_offsets));
360 free(p->large_offsets);
369 cache_packidx(struct got_packidx_v2_hdr *packidx, struct got_repository *repo)
373 for (i = 0; i < nitems(repo->packidx_cache); i++) {
374 if (repo->packidx_cache[i] == NULL)
378 if (i == nitems(repo->packidx_cache)) {
379 got_packidx_close(repo->packidx_cache[i - 1]);
380 memmove(&repo->packidx_cache[1], &repo->packidx_cache[0],
381 sizeof(repo->packidx_cache) -
382 sizeof(repo->packidx_cache[0]));
386 repo->packidx_cache[i] = dup_packidx(packidx);
389 static const struct got_error *
390 search_packidx(struct got_packidx_v2_hdr **packidx, int *idx,
391 struct got_repository *repo, struct got_object_id *id)
393 const struct got_error *err;
400 /* Search pack index cache. */
401 for (i = 0; i < nitems(repo->packidx_cache); i++) {
402 if (repo->packidx_cache[i] == NULL)
404 *idx = get_object_idx(repo->packidx_cache[i], id);
406 *packidx = repo->packidx_cache[i];
410 /* No luck. Search the filesystem. */
412 path_packdir = got_repo_get_path_objects_pack(repo);
413 if (path_packdir == NULL)
414 return got_error_from_errno();
416 packdir = opendir(path_packdir);
417 if (packdir == NULL) {
418 err = got_error_from_errno();
422 while ((dent = readdir(packdir)) != NULL) {
423 if (!is_packidx_filename(dent->d_name, dent->d_namlen))
426 if (asprintf(&path_packidx, "%s/%s", path_packdir,
427 dent->d_name) == -1) {
428 err = got_error_from_errno();
432 err = got_packidx_open(packidx, path_packidx);
437 *idx = get_object_idx(*packidx, id);
439 err = NULL; /* found the object */
440 cache_packidx(*packidx, repo);
444 got_packidx_close(*packidx);
448 err = got_error(GOT_ERR_NO_OBJ);
451 if (packdir && closedir(packdir) != 0 && err == 0)
452 err = got_error_from_errno();
456 static const struct got_error *
457 get_packfile_path(char **path_packfile, struct got_repository *repo,
458 struct got_packidx_v2_hdr *packidx)
461 char hex[SHA1_DIGEST_STRING_LENGTH];
464 path_packdir = got_repo_get_path_objects_pack(repo);
465 if (path_packdir == NULL)
466 return got_error_from_errno();
468 sha1str = got_sha1_digest_to_str(packidx->trailer.packfile_sha1,
471 return got_error(GOT_ERR_PACKIDX_CSUM);
473 if (asprintf(path_packfile, "%s/%s%s%s", path_packdir,
474 GOT_PACK_PREFIX, sha1str, GOT_PACKFILE_SUFFIX) == -1) {
475 *path_packfile = NULL;
476 return got_error_from_errno();
482 const struct got_error *
483 read_packfile_hdr(FILE *f, struct got_packidx_v2_hdr *packidx)
485 const struct got_error *err = NULL;
486 uint32_t totobj = betoh32(packidx->fanout_table[0xff]);
487 struct got_packfile_hdr hdr;
490 n = fread(&hdr, sizeof(hdr), 1, f);
492 return got_ferror(f, GOT_ERR_BAD_PACKIDX);
494 if (betoh32(hdr.signature) != GOT_PACKFILE_SIGNATURE ||
495 betoh32(hdr.version) != GOT_PACKFILE_VERSION ||
496 betoh32(hdr.nobjects) != totobj)
497 err = got_error(GOT_ERR_BAD_PACKFILE);
502 static const struct got_error *
503 open_packfile(FILE **packfile, const char *path_packfile,
504 struct got_repository *repo, struct got_packidx_v2_hdr *packidx)
506 const struct got_error *err = NULL;
510 *packfile = fopen(path_packfile, "rb");
511 if (*packfile == NULL) {
512 err = got_error_from_errno();
517 err = read_packfile_hdr(*packfile, packidx);
527 got_pack_close(struct got_pack *pack)
529 fclose(pack->packfile);
530 pack->packfile = NULL;
531 free(pack->path_packfile);
532 pack->path_packfile = NULL;
536 static const struct got_error *
537 cache_pack(struct got_pack **packp, const char *path_packfile,
538 struct got_packidx_v2_hdr *packidx, struct got_repository *repo)
540 const struct got_error *err = NULL;
541 struct got_pack *pack = NULL;
547 for (i = 0; i < nitems(repo->packs); i++) {
548 pack = &repo->packs[i];
549 if (pack->path_packfile == NULL)
551 if (strcmp(pack->path_packfile, path_packfile) == 0)
555 if (i == nitems(repo->packs) - 1) {
556 got_pack_close(&repo->packs[i - 1]);
557 memmove(&repo->packs[1], &repo->packs[0],
558 sizeof(repo->packs) - sizeof(repo->packs[0]));
562 pack = &repo->packs[i];
564 pack->path_packfile = strdup(path_packfile);
565 if (pack->path_packfile == NULL) {
566 err = got_error_from_errno();
570 err = open_packfile(&pack->packfile, path_packfile, repo, packidx);
574 err = get_packfile_size(&pack->filesize, path_packfile);
578 free(pack->path_packfile);
586 get_cached_pack(const char *path_packfile, struct got_repository *repo)
588 struct got_pack *pack = NULL;
591 for (i = 0; i < nitems(repo->packs); i++) {
592 pack = &repo->packs[i];
593 if (pack->path_packfile == NULL)
595 if (strcmp(pack->path_packfile, path_packfile) == 0)
602 static const struct got_error *
603 parse_object_type_and_size(uint8_t *type, uint64_t *size, size_t *len,
613 /* We do not support size values which don't fit in 64 bit. */
615 return got_error(GOT_ERR_NO_SPACE);
617 n = fread(&sizeN, sizeof(sizeN), 1, packfile);
619 return got_ferror(packfile, GOT_ERR_BAD_PACKIDX);
622 t = (sizeN & GOT_PACK_OBJ_SIZE0_TYPE_MASK) >>
623 GOT_PACK_OBJ_SIZE0_TYPE_MASK_SHIFT;
624 s = (sizeN & GOT_PACK_OBJ_SIZE0_VAL_MASK);
626 size_t shift = 4 + 7 * (i - 1);
627 s |= ((sizeN & GOT_PACK_OBJ_SIZE_VAL_MASK) << shift);
630 } while (sizeN & GOT_PACK_OBJ_SIZE_MORE);
634 *len = i * sizeof(sizeN);
638 static const struct got_error *
639 open_plain_object(struct got_object **obj, const char *path_packfile,
640 struct got_object_id *id, uint8_t type, off_t offset, size_t size)
642 *obj = calloc(1, sizeof(**obj));
644 return got_error_from_errno();
646 (*obj)->path_packfile = strdup(path_packfile);
647 if ((*obj)->path_packfile == NULL) {
648 const struct got_error *err = got_error_from_errno();
655 (*obj)->flags = GOT_OBJ_FLAG_PACKED;
658 memcpy(&(*obj)->id, id, sizeof((*obj)->id));
659 (*obj)->pack_offset = offset;
664 static const struct got_error *
665 parse_negative_offset(int64_t *offset, size_t *len, FILE *packfile)
673 /* We do not support offset values which don't fit in 64 bit. */
675 return got_error(GOT_ERR_NO_SPACE);
677 n = fread(&offN, sizeof(offN), 1, packfile);
679 return got_ferror(packfile, GOT_ERR_BAD_PACKIDX);
682 o = (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
686 o += (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
689 } while (offN & GOT_PACK_OBJ_DELTA_OFF_MORE);
692 *len = i * sizeof(offN);
696 static const struct got_error *
697 parse_offset_delta(off_t *base_offset, FILE *packfile, off_t offset)
699 const struct got_error *err;
703 err = parse_negative_offset(&negoffset, &negofflen, packfile);
707 /* Compute the base object's offset (must be in the same pack file). */
708 *base_offset = (offset - negoffset);
709 if (*base_offset <= 0)
710 return got_error(GOT_ERR_BAD_PACKFILE);
715 static const struct got_error *
716 resolve_delta_chain(struct got_delta_chain *, struct got_repository *,
717 FILE *, const char *, off_t, size_t, int, size_t);
719 static const struct got_error *
720 add_delta(struct got_delta_chain *deltas, const char *path_packfile,
721 off_t delta_offset, size_t tslen, int delta_type, size_t delta_size,
722 size_t delta_data_offset, uint8_t *delta_buf, size_t delta_len)
724 struct got_delta *delta;
726 delta = got_delta_open(path_packfile, delta_offset, tslen,
727 delta_type, delta_size, delta_data_offset, delta_buf,
730 return got_error_from_errno();
731 /* delta is freed in got_object_close() */
733 SIMPLEQ_INSERT_HEAD(&deltas->entries, delta, entry);
737 static const struct got_error *
738 resolve_offset_delta(struct got_delta_chain *deltas,
739 struct got_repository *repo, FILE *packfile, const char *path_packfile,
740 off_t delta_offset,size_t tslen, int delta_type, size_t delta_size)
743 const struct got_error *err;
748 off_t delta_data_offset;
752 err = parse_offset_delta(&base_offset, packfile, delta_offset);
756 delta_data_offset = ftello(packfile);
757 if (delta_data_offset == -1)
758 return got_error_from_errno();
760 err = got_inflate_to_mem(&delta_buf, &delta_len, packfile);
764 err = add_delta(deltas, path_packfile, delta_offset, tslen,
765 delta_type, delta_size, delta_data_offset, delta_buf, delta_len);
769 /* An offset delta must be in the same packfile. */
770 if (fseeko(packfile, base_offset, SEEK_SET) != 0)
771 return got_error_from_errno();
773 err = parse_object_type_and_size(&base_type, &base_size, &base_tslen,
778 return resolve_delta_chain(deltas, repo, packfile, path_packfile,
779 base_offset, base_tslen, base_type, base_size);
782 static const struct got_error *
783 resolve_ref_delta(struct got_delta_chain *deltas, struct got_repository *repo,
784 FILE *packfile, const char *path_packfile, off_t delta_offset,
785 size_t tslen, int delta_type, size_t delta_size)
787 const struct got_error *err;
788 struct got_object_id id;
789 struct got_packidx_v2_hdr *packidx;
796 char *path_base_packfile;
797 struct got_pack *base_pack;
798 off_t delta_data_offset;
802 n = fread(&id, sizeof(id), 1, packfile);
804 return got_ferror(packfile, GOT_ERR_IO);
806 delta_data_offset = ftello(packfile);
807 if (delta_data_offset == -1)
808 return got_error_from_errno();
810 err = got_inflate_to_mem(&delta_buf, &delta_len, packfile);
814 err = add_delta(deltas, path_packfile, delta_offset, tslen,
815 delta_type, delta_size, delta_data_offset, delta_buf, delta_len);
819 err = search_packidx(&packidx, &idx, repo, &id);
823 base_offset = get_object_offset(packidx, idx);
824 if (base_offset == (uint64_t)-1) {
825 return got_error(GOT_ERR_BAD_PACKIDX);
828 err = get_packfile_path(&path_base_packfile, repo, packidx);
832 base_pack = get_cached_pack(path_base_packfile, repo);
833 if (base_pack == NULL) {
834 err = cache_pack(&base_pack, path_base_packfile, NULL, repo);
839 if (fseeko(base_pack->packfile, base_offset, SEEK_SET) != 0) {
840 err = got_error_from_errno();
844 err = parse_object_type_and_size(&base_type, &base_size, &base_tslen,
845 base_pack->packfile);
849 err = resolve_delta_chain(deltas, repo, base_pack->packfile,
850 path_base_packfile, base_offset, base_tslen, base_type,
853 free(path_base_packfile);
857 static const struct got_error *
858 resolve_delta_chain(struct got_delta_chain *deltas, struct got_repository *repo,
859 FILE *packfile, const char *path_packfile, off_t delta_offset, size_t tslen,
860 int delta_type, size_t delta_size)
862 const struct got_error *err = NULL;
864 switch (delta_type) {
865 case GOT_OBJ_TYPE_COMMIT:
866 case GOT_OBJ_TYPE_TREE:
867 case GOT_OBJ_TYPE_BLOB:
868 case GOT_OBJ_TYPE_TAG:
869 /* Plain types are the final delta base. Recursion ends. */
870 err = add_delta(deltas, path_packfile, delta_offset, tslen,
871 delta_type, delta_size, 0, NULL, 0);
873 case GOT_OBJ_TYPE_OFFSET_DELTA:
874 err = resolve_offset_delta(deltas, repo, packfile,
875 path_packfile, delta_offset, tslen, delta_type,
878 case GOT_OBJ_TYPE_REF_DELTA:
879 err = resolve_ref_delta(deltas, repo, packfile,
880 path_packfile, delta_offset, tslen, delta_type,
884 return got_error(GOT_ERR_NOT_IMPL);
890 static const struct got_error *
891 open_delta_object(struct got_object **obj, struct got_repository *repo,
892 struct got_packidx_v2_hdr *packidx, const char *path_packfile,
893 FILE *packfile, struct got_object_id *id, off_t offset, size_t tslen,
894 int delta_type, size_t delta_size)
896 const struct got_error *err = NULL;
899 *obj = calloc(1, sizeof(**obj));
901 return got_error_from_errno();
905 (*obj)->size = 0; /* Not known because deltas aren't applied yet. */
906 memcpy(&(*obj)->id, id, sizeof((*obj)->id));
907 (*obj)->pack_offset = offset + tslen;
909 (*obj)->path_packfile = strdup(path_packfile);
910 if ((*obj)->path_packfile == NULL) {
911 err = got_error_from_errno();
914 (*obj)->flags |= GOT_OBJ_FLAG_PACKED;
916 SIMPLEQ_INIT(&(*obj)->deltas.entries);
917 (*obj)->flags |= GOT_OBJ_FLAG_DELTIFIED;
919 err = resolve_delta_chain(&(*obj)->deltas, repo, packfile,
920 path_packfile, offset, tslen, delta_type, delta_size);
924 err = got_delta_chain_get_base_type(&resolved_type, &(*obj)->deltas);
927 (*obj)->type = resolved_type;
931 got_object_close(*obj);
937 static const struct got_error *
938 open_packed_object(struct got_object **obj, struct got_repository *repo,
939 struct got_packidx_v2_hdr *packidx, int idx, struct got_object_id *id)
941 const struct got_error *err = NULL;
944 struct got_pack *pack;
951 offset = get_object_offset(packidx, idx);
952 if (offset == (uint64_t)-1)
953 return got_error(GOT_ERR_BAD_PACKIDX);
955 err = get_packfile_path(&path_packfile, repo, packidx);
959 pack = get_cached_pack(path_packfile, repo);
961 err = cache_pack(&pack, path_packfile, packidx, repo);
966 if (fseeko(pack->packfile, offset, SEEK_SET) != 0) {
967 err = got_error_from_errno();
971 err = parse_object_type_and_size(&type, &size, &tslen, pack->packfile);
976 case GOT_OBJ_TYPE_COMMIT:
977 case GOT_OBJ_TYPE_TREE:
978 case GOT_OBJ_TYPE_BLOB:
979 case GOT_OBJ_TYPE_TAG:
980 err = open_plain_object(obj, path_packfile, id, type,
981 offset + tslen, size);
984 case GOT_OBJ_TYPE_OFFSET_DELTA:
985 case GOT_OBJ_TYPE_REF_DELTA:
986 err = open_delta_object(obj, repo, packidx, path_packfile,
987 pack->packfile, id, offset, tslen, type, size);
991 err = got_error(GOT_ERR_NOT_IMPL);
999 const struct got_error *
1000 got_packfile_open_object(struct got_object **obj, struct got_object_id *id,
1001 struct got_repository *repo)
1003 const struct got_error *err = NULL;
1004 struct got_packidx_v2_hdr *packidx = NULL;
1007 err = search_packidx(&packidx, &idx, repo, id);
1011 err = open_packed_object(obj, repo, packidx, idx, id);
1015 err = cache_pack(NULL, (*obj)->path_packfile, packidx, repo);
1019 static const struct got_error *
1020 get_delta_chain_max_size(uint64_t *max_size, struct got_delta_chain *deltas)
1022 struct got_delta *delta;
1023 uint64_t base_size = 0, result_size = 0;
1026 SIMPLEQ_FOREACH(delta, &deltas->entries, entry) {
1027 /* Plain object types are the delta base. */
1028 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1029 delta->type != GOT_OBJ_TYPE_TREE &&
1030 delta->type != GOT_OBJ_TYPE_BLOB &&
1031 delta->type != GOT_OBJ_TYPE_TAG) {
1032 const struct got_error *err;
1033 err = got_delta_get_sizes(&base_size, &result_size,
1034 delta->delta_buf, delta->delta_len);
1038 base_size = delta->size;
1039 if (base_size > *max_size)
1040 *max_size = base_size;
1041 if (result_size > *max_size)
1042 *max_size = result_size;
1048 static const struct got_error *
1049 dump_delta_chain_to_file(size_t *result_size, struct got_delta_chain *deltas,
1050 FILE *outfile, struct got_pack *pack, struct got_repository *repo)
1052 const struct got_error *err = NULL;
1053 struct got_delta *delta;
1054 FILE *base_file = NULL, *accum_file = NULL;
1055 uint8_t *base_buf = NULL, *accum_buf = NULL;
1056 size_t accum_size = 0;
1062 if (SIMPLEQ_EMPTY(&deltas->entries))
1063 return got_error(GOT_ERR_BAD_DELTA_CHAIN);
1065 /* We process small enough files entirely in memory for speed. */
1066 err = get_delta_chain_max_size(&max_size, deltas);
1069 if (max_size < GOT_DELTA_RESULT_SIZE_CACHED_MAX) {
1070 accum_buf = malloc(max_size);
1071 if (accum_buf == NULL)
1072 return got_error_from_errno();
1074 base_file = got_opentemp();
1075 if (base_file == NULL)
1076 return got_error_from_errno();
1078 accum_file = got_opentemp();
1079 if (accum_file == NULL) {
1080 err = got_error_from_errno();
1086 /* Deltas are ordered in ascending order. */
1087 SIMPLEQ_FOREACH(delta, &deltas->entries, entry) {
1091 /* Plain object types are the delta base. */
1092 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1093 delta->type != GOT_OBJ_TYPE_TREE &&
1094 delta->type != GOT_OBJ_TYPE_BLOB &&
1095 delta->type != GOT_OBJ_TYPE_TAG) {
1096 err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1100 if (fseeko(pack->packfile, delta->offset + delta->tslen,
1102 err = got_error_from_errno();
1106 err = got_inflate_to_file(&base_len,
1107 pack->packfile, base_file);
1109 err = got_inflate_to_mem(&base_buf, &base_len,
1111 if (base_len < max_size) {
1113 p = reallocarray(base_buf, 1, max_size);
1115 err = got_error_from_errno();
1130 err = got_delta_apply_in_mem(base_buf, delta->delta_buf,
1131 delta->delta_len, accum_buf, &accum_size);
1134 err = got_delta_apply(base_file, delta->delta_buf,
1136 /* Final delta application writes to output file. */
1137 ++n < deltas->nentries ? accum_file : outfile,
1143 if (n < deltas->nentries) {
1144 /* Accumulated delta becomes the new base. */
1146 uint8_t *tmp = accum_buf;
1147 accum_buf = base_buf;
1150 FILE *tmp = accum_file;
1151 accum_file = base_file;
1162 size_t len = fwrite(accum_buf, 1, accum_size, outfile);
1164 if (len != accum_size)
1165 return got_ferror(outfile, GOT_ERR_IO);
1173 *result_size = accum_size;
1177 static const struct got_error *
1178 dump_delta_chain_to_mem(uint8_t **outbuf, size_t *outlen,
1179 struct got_delta_chain *deltas, struct got_pack *pack,
1180 struct got_repository *repo)
1182 const struct got_error *err = NULL;
1183 struct got_delta *delta;
1184 uint8_t *base_buf = NULL, *accum_buf = NULL;
1192 if (SIMPLEQ_EMPTY(&deltas->entries))
1193 return got_error(GOT_ERR_BAD_DELTA_CHAIN);
1195 err = get_delta_chain_max_size(&max_size, deltas);
1198 accum_buf = malloc(max_size);
1199 if (accum_buf == NULL)
1200 return got_error_from_errno();
1202 /* Deltas are ordered in ascending order. */
1203 SIMPLEQ_FOREACH(delta, &deltas->entries, entry) {
1207 /* Plain object types are the delta base. */
1208 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1209 delta->type != GOT_OBJ_TYPE_TREE &&
1210 delta->type != GOT_OBJ_TYPE_BLOB &&
1211 delta->type != GOT_OBJ_TYPE_TAG) {
1212 err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1216 if (fseeko(pack->packfile, delta->offset + delta->tslen,
1218 err = got_error_from_errno();
1221 err = got_inflate_to_mem(&base_buf, &base_len,
1223 if (base_len < max_size) {
1225 p = reallocarray(base_buf, 1, max_size);
1227 err = got_error_from_errno();
1238 err = got_delta_apply_in_mem(base_buf, delta->delta_buf,
1239 delta->delta_len, accum_buf, &accum_size);
1244 if (n < deltas->nentries) {
1245 /* Accumulated delta becomes the new base. */
1246 uint8_t *tmp = accum_buf;
1247 accum_buf = base_buf;
1259 *outbuf = accum_buf;
1260 *outlen = accum_size;
1265 const struct got_error *
1266 got_packfile_extract_object(FILE **f, struct got_object *obj,
1267 struct got_repository *repo)
1269 const struct got_error *err = NULL;
1270 struct got_pack *pack;
1272 if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
1273 return got_error(GOT_ERR_OBJ_NOT_PACKED);
1275 pack = get_cached_pack(obj->path_packfile, repo);
1277 err = cache_pack(&pack, obj->path_packfile, NULL, repo);
1282 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0) {
1283 if (fseeko(pack->packfile, obj->pack_offset, SEEK_SET) != 0) {
1284 err = got_error_from_errno();
1288 if (obj->size < GOT_DELTA_RESULT_SIZE_CACHED_MAX) {
1289 size_t size = obj->size;
1290 if (size == 0) /* empty file */
1292 *f = fmemopen(NULL, size, "w+");
1294 *f = got_opentemp();
1296 err = got_error(GOT_ERR_FILE_OPEN);
1299 err = got_inflate_to_file(&obj->size, pack->packfile, *f);
1303 err = get_delta_chain_max_size(&max_size, &obj->deltas);
1306 if (max_size < GOT_DELTA_RESULT_SIZE_CACHED_MAX)
1307 *f = fmemopen(NULL, max_size, "w+");
1309 *f = got_opentemp();
1311 err = got_error(GOT_ERR_FILE_OPEN);
1314 err = dump_delta_chain_to_file(&obj->size, &obj->deltas, *f,
1325 const struct got_error *
1326 got_packfile_extract_object_to_mem(uint8_t **buf, size_t *len,
1327 struct got_object *obj, struct got_repository *repo)
1329 const struct got_error *err = NULL;
1330 FILE *packfile = NULL;
1331 struct got_pack *pack;
1333 if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
1334 return got_error(GOT_ERR_OBJ_NOT_PACKED);
1336 pack = get_cached_pack(obj->path_packfile, repo);
1338 err = cache_pack(&pack, obj->path_packfile, NULL, repo);
1343 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0) {
1344 if (fseeko(pack->packfile, obj->pack_offset, SEEK_SET) != 0) {
1345 err = got_error_from_errno();
1349 err = got_inflate_to_mem(buf, len, pack->packfile);
1351 err = dump_delta_chain_to_mem(buf, len, &obj->deltas, pack,