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"
36 #include "got_opentemp.h"
38 #include "got_lib_sha1.h"
39 #include "got_lib_pack.h"
40 #include "got_lib_path.h"
41 #include "got_lib_delta.h"
42 #include "got_lib_zbuf.h"
43 #include "got_lib_object.h"
44 #include "got_lib_repository.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)
85 dot = strrchr(path, '.');
87 return got_error(GOT_ERR_BAD_PATH);
89 /* Path must point to a pack index or to a pack file. */
90 if (strcmp(dot, ".idx") == 0) {
91 const struct got_error *err = NULL;
93 char base_path[PATH_MAX];
95 /* Convert pack index path to pack file path. */
96 if (strlcpy(base_path, path, PATH_MAX) > PATH_MAX)
97 return got_error(GOT_ERR_NO_SPACE);
98 dot = strrchr(base_path, '.');
100 return got_error(GOT_ERR_BAD_PATH);
102 if (asprintf(&path_pack, "%s.pack", base_path) == -1)
103 return got_error_from_errno();
105 if (stat(path_pack, &sb) != 0)
106 err = got_error_from_errno();
110 } else if (strcmp(dot, ".pack") == 0) {
111 if (stat(path, &sb) != 0)
112 return got_error_from_errno();
114 return got_error(GOT_ERR_BAD_PATH);
120 const struct got_error *
121 got_packidx_open(struct got_packidx **packidx, const char *path)
123 struct got_packidx *p;
124 struct got_packidx_v2_hdr *h;
126 const struct got_error *err = NULL;
127 size_t n, nobj, packfile_size;
129 uint8_t sha1[SHA1_DIGEST_LENGTH];
135 f = fopen(path, "rb");
137 return got_error_from_errno();
139 err = get_packfile_size(&packfile_size, path);
143 p = calloc(1, sizeof(*p));
145 return got_error_from_errno();
146 p->path_packidx = strdup(path);
147 if (p->path_packidx == NULL) {
148 err = got_error_from_errno();
149 free(p->path_packidx);
155 n = fread(&h->magic, sizeof(h->magic), 1, f);
157 err = got_ferror(f, GOT_ERR_BAD_PACKIDX);
161 if (betoh32(h->magic) != GOT_PACKIDX_V2_MAGIC) {
162 err = got_error(GOT_ERR_BAD_PACKIDX);
166 SHA1Update(&ctx, (uint8_t *)&h->magic, sizeof(h->magic));
168 n = fread(&h->version, sizeof(h->version), 1, f);
170 err = got_ferror(f, GOT_ERR_BAD_PACKIDX);
174 if (betoh32(h->version) != GOT_PACKIDX_VERSION) {
175 err = got_error(GOT_ERR_BAD_PACKIDX);
179 SHA1Update(&ctx, (uint8_t *)&h->version, sizeof(h->version));
181 n = fread(&h->fanout_table, sizeof(h->fanout_table), 1, f);
183 err = got_ferror(f, GOT_ERR_BAD_PACKIDX);
187 err = verify_fanout_table(h->fanout_table);
191 SHA1Update(&ctx, (uint8_t *)h->fanout_table, sizeof(h->fanout_table));
193 nobj = betoh32(h->fanout_table[0xff]);
195 h->sorted_ids = calloc(nobj, sizeof(*h->sorted_ids));
196 if (h->sorted_ids == NULL) {
197 err = got_error_from_errno();
201 n = fread(h->sorted_ids, sizeof(*h->sorted_ids), nobj, f);
203 err = got_ferror(f, GOT_ERR_BAD_PACKIDX);
207 SHA1Update(&ctx, (uint8_t *)h->sorted_ids,
208 nobj * sizeof(*h->sorted_ids));
210 h->crc32 = calloc(nobj, sizeof(*h->crc32));
211 if (h->crc32 == NULL) {
212 err = got_error_from_errno();
216 n = fread(h->crc32, sizeof(*h->crc32), nobj, f);
218 err = got_ferror(f, GOT_ERR_BAD_PACKIDX);
222 SHA1Update(&ctx, (uint8_t *)h->crc32, nobj * sizeof(*h->crc32));
224 h->offsets = calloc(nobj, sizeof(*h->offsets));
225 if (h->offsets == NULL) {
226 err = got_error_from_errno();
230 n = fread(h->offsets, sizeof(*h->offsets), nobj, f);
232 err = got_ferror(f, GOT_ERR_BAD_PACKIDX);
236 SHA1Update(&ctx, (uint8_t *)h->offsets, nobj * sizeof(*h->offsets));
238 /* Large file offsets are contained only in files > 2GB. */
239 if (packfile_size <= 0x80000000)
242 h->large_offsets = calloc(nobj, sizeof(*h->large_offsets));
243 if (h->large_offsets == NULL) {
244 err = got_error_from_errno();
248 n = fread(h->large_offsets, sizeof(*h->large_offsets), nobj, f);
250 err = got_ferror(f, GOT_ERR_BAD_PACKIDX);
254 SHA1Update(&ctx, (uint8_t*)h->large_offsets,
255 nobj * sizeof(*h->large_offsets));
258 n = fread(&h->trailer, sizeof(h->trailer), 1, f);
260 err = got_ferror(f, GOT_ERR_BAD_PACKIDX);
264 SHA1Update(&ctx, h->trailer.packfile_sha1, SHA1_DIGEST_LENGTH);
265 SHA1Final(sha1, &ctx);
266 if (memcmp(h->trailer.packidx_sha1, sha1, SHA1_DIGEST_LENGTH) != 0)
267 err = got_error(GOT_ERR_PACKIDX_CSUM);
271 got_packidx_close(p);
278 got_packidx_close(struct got_packidx *packidx)
280 free(packidx->hdr.sorted_ids);
281 free(packidx->hdr.offsets);
282 free(packidx->hdr.crc32);
283 free(packidx->hdr.large_offsets);
284 free(packidx->path_packidx);
289 is_packidx_filename(const char *name, size_t len)
291 if (len != GOT_PACKIDX_NAMELEN)
294 if (strncmp(name, GOT_PACK_PREFIX, strlen(GOT_PACK_PREFIX)) != 0)
297 if (strcmp(name + strlen(GOT_PACK_PREFIX) +
298 SHA1_DIGEST_STRING_LENGTH - 1, GOT_PACKIDX_SUFFIX) != 0)
305 get_object_offset(struct got_packidx *packidx, int idx)
307 uint32_t totobj = betoh32(packidx->hdr.fanout_table[0xff]);
308 uint32_t offset = betoh32(packidx->hdr.offsets[idx]);
309 if (offset & GOT_PACKIDX_OFFSET_VAL_IS_LARGE_IDX) {
311 idx = offset & GOT_PACKIDX_OFFSET_VAL_MASK;
312 if (idx < 0 || idx > totobj ||
313 packidx->hdr.large_offsets == NULL)
315 loffset = betoh64(packidx->hdr.large_offsets[idx]);
316 return (loffset > INT64_MAX ? -1 : (off_t)loffset);
318 return (off_t)(offset & GOT_PACKIDX_OFFSET_VAL_MASK);
321 static const struct got_error *
322 get_packfile_path(char **path_packfile, struct got_repository *repo,
323 struct got_packidx *packidx);
326 get_object_idx(struct got_packidx *packidx, struct got_object_id *id,
327 struct got_repository *repo)
329 u_int8_t id0 = id->sha1[0];
330 uint32_t totobj = betoh32(packidx->hdr.fanout_table[0xff]);
334 i = betoh32(packidx->hdr.fanout_table[id0 - 1]);
337 struct got_object_id *oid = &packidx->hdr.sorted_ids[i];
338 int cmp = got_object_id_cmp(id, oid);
348 static struct got_packidx *
349 dup_packidx(struct got_packidx *packidx)
351 struct got_packidx *p;
354 p = calloc(1, sizeof(*p));
358 p->path_packidx = strdup(packidx->path_packidx);
359 if (p->path_packidx == NULL) {
363 memcpy(&p->hdr, &packidx->hdr, sizeof(p->hdr));
364 p->hdr.sorted_ids = NULL;
366 p->hdr.offsets = NULL;
367 p->hdr.large_offsets = NULL;
369 nobj = betoh32(p->hdr.fanout_table[0xff]);
371 p->hdr.sorted_ids = calloc(nobj, sizeof(*p->hdr.sorted_ids));
372 if (p->hdr.sorted_ids == NULL)
374 memcpy(p->hdr.sorted_ids, packidx->hdr.sorted_ids,
375 nobj * sizeof(*p->hdr.sorted_ids));
377 p->hdr.crc32 = calloc(nobj, sizeof(*p->hdr.crc32));
378 if (p->hdr.crc32 == NULL)
380 memcpy(p->hdr.crc32, packidx->hdr.crc32, nobj * sizeof(*p->hdr.crc32));
382 p->hdr.offsets = calloc(nobj, sizeof(*p->hdr.offsets));
383 if (p->hdr.offsets == NULL)
385 memcpy(p->hdr.offsets, packidx->hdr.offsets,
386 nobj * sizeof(*p->hdr.offsets));
388 if (p->hdr.large_offsets) {
389 p->hdr.large_offsets = calloc(nobj,
390 sizeof(*p->hdr.large_offsets));
391 if (p->hdr.large_offsets == NULL)
393 memcpy(p->hdr.large_offsets, packidx->hdr.large_offsets,
394 nobj * sizeof(*p->hdr.large_offsets));
400 free(p->hdr.large_offsets);
401 free(p->hdr.offsets);
403 free(p->hdr.sorted_ids);
404 free(p->path_packidx);
410 cache_packidx(struct got_packidx *packidx, struct got_repository *repo)
414 for (i = 0; i < nitems(repo->packidx_cache); i++) {
415 if (repo->packidx_cache[i] == NULL)
419 if (i == nitems(repo->packidx_cache)) {
420 got_packidx_close(repo->packidx_cache[i - 1]);
421 memmove(&repo->packidx_cache[1], &repo->packidx_cache[0],
422 sizeof(repo->packidx_cache) -
423 sizeof(repo->packidx_cache[0]));
427 repo->packidx_cache[i] = dup_packidx(packidx);
430 static const struct got_error *
431 search_packidx(struct got_packidx **packidx, int *idx,
432 struct got_repository *repo, struct got_object_id *id)
434 const struct got_error *err;
441 /* Search pack index cache. */
442 for (i = 0; i < nitems(repo->packidx_cache); i++) {
443 if (repo->packidx_cache[i] == NULL)
445 *idx = get_object_idx(repo->packidx_cache[i], id, repo);
447 *packidx = repo->packidx_cache[i];
451 /* No luck. Search the filesystem. */
453 path_packdir = got_repo_get_path_objects_pack(repo);
454 if (path_packdir == NULL)
455 return got_error_from_errno();
457 packdir = opendir(path_packdir);
458 if (packdir == NULL) {
459 err = got_error_from_errno();
463 while ((dent = readdir(packdir)) != NULL) {
464 if (!is_packidx_filename(dent->d_name, dent->d_namlen))
467 if (asprintf(&path_packidx, "%s/%s", path_packdir,
468 dent->d_name) == -1) {
469 err = got_error_from_errno();
473 err = got_packidx_open(packidx, path_packidx);
478 *idx = get_object_idx(*packidx, id, repo);
480 err = NULL; /* found the object */
481 cache_packidx(*packidx, repo);
485 got_packidx_close(*packidx);
489 err = got_error(GOT_ERR_NO_OBJ);
492 if (packdir && closedir(packdir) != 0 && err == 0)
493 err = got_error_from_errno();
497 static const struct got_error *
498 get_packfile_path(char **path_packfile, struct got_repository *repo,
499 struct got_packidx *packidx)
503 /* Packfile path contains ".pack" instead of ".idx", so add one byte. */
504 size = strlen(packidx->path_packidx) + 2;
505 if (size < GOT_PACKFILE_NAMELEN + 1)
506 return got_error(GOT_ERR_BAD_PATH);
508 *path_packfile = calloc(size, sizeof(**path_packfile));
509 if (*path_packfile == NULL)
510 return got_error_from_errno();
512 /* Copy up to and excluding ".idx". */
513 strncpy(*path_packfile, packidx->path_packidx,
514 size - strlen(".idx") - 2);
516 if (strlcat(*path_packfile, GOT_PACKFILE_SUFFIX, size) >= size)
517 return got_error(GOT_ERR_NO_SPACE);
522 const struct got_error *
523 read_packfile_hdr(int fd, struct got_packidx *packidx)
525 const struct got_error *err = NULL;
526 uint32_t totobj = betoh32(packidx->hdr.fanout_table[0xff]);
527 struct got_packfile_hdr hdr;
530 n = read(fd, &hdr, sizeof(hdr));
532 return got_error_from_errno();
533 if (n != sizeof(hdr))
534 return got_error(GOT_ERR_BAD_PACKFILE);
536 if (betoh32(hdr.signature) != GOT_PACKFILE_SIGNATURE ||
537 betoh32(hdr.version) != GOT_PACKFILE_VERSION ||
538 betoh32(hdr.nobjects) != totobj)
539 err = got_error(GOT_ERR_BAD_PACKFILE);
544 static const struct got_error *
545 open_packfile(int *fd, const char *path_packfile,
546 struct got_repository *repo, struct got_packidx *packidx)
548 const struct got_error *err = NULL;
550 *fd = open(path_packfile, O_RDONLY | O_NOFOLLOW, GOT_DEFAULT_FILE_MODE);
552 return got_error_from_errno();
555 err = read_packfile_hdr(*fd, packidx);
565 got_pack_close(struct got_pack *pack)
569 free(pack->path_packfile);
570 pack->path_packfile = NULL;
574 static const struct got_error *
575 cache_pack(struct got_pack **packp, const char *path_packfile,
576 struct got_packidx *packidx, struct got_repository *repo)
578 const struct got_error *err = NULL;
579 struct got_pack *pack = NULL;
585 for (i = 0; i < nitems(repo->packs); i++) {
586 pack = &repo->packs[i];
587 if (pack->path_packfile == NULL)
589 if (strcmp(pack->path_packfile, path_packfile) == 0)
593 if (i == nitems(repo->packs) - 1) {
594 got_pack_close(&repo->packs[i - 1]);
595 memmove(&repo->packs[1], &repo->packs[0],
596 sizeof(repo->packs) - sizeof(repo->packs[0]));
600 pack = &repo->packs[i];
602 pack->path_packfile = strdup(path_packfile);
603 if (pack->path_packfile == NULL) {
604 err = got_error_from_errno();
608 err = open_packfile(&pack->fd, path_packfile, repo, packidx);
612 err = get_packfile_size(&pack->filesize, path_packfile);
616 free(pack->path_packfile);
617 memset(pack, 0, sizeof(*pack));
625 get_cached_pack(const char *path_packfile, struct got_repository *repo)
627 struct got_pack *pack = NULL;
630 for (i = 0; i < nitems(repo->packs); i++) {
631 pack = &repo->packs[i];
632 if (pack->path_packfile == NULL)
634 if (strcmp(pack->path_packfile, path_packfile) == 0)
641 static const struct got_error *
642 parse_object_type_and_size(uint8_t *type, uint64_t *size, size_t *len, int fd)
651 /* We do not support size values which don't fit in 64 bit. */
653 return got_error(GOT_ERR_NO_SPACE);
655 n = read(fd, &sizeN, sizeof(sizeN));
657 return got_error_from_errno();
658 if (n != sizeof(sizeN))
659 return got_error(GOT_ERR_BAD_PACKFILE);
662 t = (sizeN & GOT_PACK_OBJ_SIZE0_TYPE_MASK) >>
663 GOT_PACK_OBJ_SIZE0_TYPE_MASK_SHIFT;
664 s = (sizeN & GOT_PACK_OBJ_SIZE0_VAL_MASK);
666 size_t shift = 4 + 7 * (i - 1);
667 s |= ((sizeN & GOT_PACK_OBJ_SIZE_VAL_MASK) << shift);
670 } while (sizeN & GOT_PACK_OBJ_SIZE_MORE);
674 *len = i * sizeof(sizeN);
678 static const struct got_error *
679 open_plain_object(struct got_object **obj, const char *path_packfile,
680 struct got_object_id *id, uint8_t type, off_t offset, size_t size)
682 *obj = calloc(1, sizeof(**obj));
684 return got_error_from_errno();
686 (*obj)->path_packfile = strdup(path_packfile);
687 if ((*obj)->path_packfile == NULL) {
688 const struct got_error *err = got_error_from_errno();
695 (*obj)->flags = GOT_OBJ_FLAG_PACKED;
698 memcpy(&(*obj)->id, id, sizeof((*obj)->id));
699 (*obj)->pack_offset = offset;
704 static const struct got_error *
705 parse_negative_offset(int64_t *offset, size_t *len, int fd)
713 /* We do not support offset values which don't fit in 64 bit. */
715 return got_error(GOT_ERR_NO_SPACE);
717 n = read(fd, &offN, sizeof(offN));
719 return got_error_from_errno();
720 if (n != sizeof(offN))
721 return got_error(GOT_ERR_BAD_PACKFILE);
724 o = (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
728 o += (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
731 } while (offN & GOT_PACK_OBJ_DELTA_OFF_MORE);
734 *len = i * sizeof(offN);
738 static const struct got_error *
739 parse_offset_delta(off_t *base_offset, int fd, off_t offset)
741 const struct got_error *err;
745 err = parse_negative_offset(&negoffset, &negofflen, fd);
749 /* Compute the base object's offset (must be in the same pack file). */
750 *base_offset = (offset - negoffset);
751 if (*base_offset <= 0)
752 return got_error(GOT_ERR_BAD_PACKFILE);
757 static const struct got_error *
758 resolve_delta_chain(struct got_delta_chain *, struct got_repository *,
759 int, size_t, const char *, off_t, size_t, int, size_t, unsigned int);
761 static const struct got_error *
762 add_delta(struct got_delta_chain *deltas, const char *path_packfile,
763 off_t delta_offset, size_t tslen, int delta_type, size_t delta_size,
764 size_t delta_data_offset, uint8_t *delta_buf, size_t delta_len)
766 struct got_delta *delta;
768 delta = got_delta_open(path_packfile, delta_offset, tslen,
769 delta_type, delta_size, delta_data_offset, delta_buf,
772 return got_error_from_errno();
773 /* delta is freed in got_object_close() */
775 SIMPLEQ_INSERT_HEAD(&deltas->entries, delta, entry);
779 static const struct got_error *
780 resolve_offset_delta(struct got_delta_chain *deltas,
781 struct got_repository *repo, int fd, size_t packfile_size,
782 const char *path_packfile, off_t delta_offset, size_t tslen,
783 int delta_type, size_t delta_size, unsigned int recursion)
786 const struct got_error *err;
791 off_t delta_data_offset;
795 err = parse_offset_delta(&base_offset, fd, delta_offset);
799 delta_data_offset = lseek(fd, 0, SEEK_CUR);
800 if (delta_data_offset == -1)
801 return got_error_from_errno();
803 err = got_inflate_to_mem_fd(&delta_buf, &delta_len, fd);
807 err = add_delta(deltas, path_packfile, delta_offset, tslen,
808 delta_type, delta_size, delta_data_offset, delta_buf, delta_len);
812 /* An offset delta must be in the same packfile. */
813 if (base_offset >= packfile_size)
814 return got_error(GOT_ERR_PACK_OFFSET);
815 if (lseek(fd, base_offset, SEEK_SET) == -1)
816 return got_error_from_errno();
818 err = parse_object_type_and_size(&base_type, &base_size, &base_tslen,
823 return resolve_delta_chain(deltas, repo, fd, packfile_size,
824 path_packfile, base_offset, base_tslen, base_type, base_size,
828 static const struct got_error *
829 resolve_ref_delta(struct got_delta_chain *deltas, struct got_repository *repo,
830 int fd, const char *path_packfile, off_t delta_offset,
831 size_t tslen, int delta_type, size_t delta_size, unsigned int recursion)
833 const struct got_error *err;
834 struct got_object_id id;
835 struct got_packidx *packidx;
842 char *path_base_packfile;
843 struct got_pack *base_pack;
844 off_t delta_data_offset;
848 n = read(fd, &id, sizeof(id));
850 return got_error_from_errno();
852 return got_error(GOT_ERR_BAD_PACKFILE);
854 delta_data_offset = lseek(fd, 0, SEEK_CUR);
855 if (delta_data_offset == -1)
856 return got_error_from_errno();
858 err = got_inflate_to_mem_fd(&delta_buf, &delta_len, fd);
862 err = add_delta(deltas, path_packfile, delta_offset, tslen,
863 delta_type, delta_size, delta_data_offset, delta_buf, delta_len);
867 err = search_packidx(&packidx, &idx, repo, &id);
871 base_offset = get_object_offset(packidx, idx);
872 if (base_offset == (uint64_t)-1) {
873 return got_error(GOT_ERR_BAD_PACKIDX);
876 err = get_packfile_path(&path_base_packfile, repo, packidx);
880 base_pack = get_cached_pack(path_base_packfile, repo);
881 if (base_pack == NULL) {
882 err = cache_pack(&base_pack, path_base_packfile, NULL, repo);
887 if (base_offset >= base_pack->filesize) {
888 err = got_error(GOT_ERR_PACK_OFFSET);
891 if (lseek(base_pack->fd, base_offset, SEEK_SET) == -1) {
892 err = got_error_from_errno();
896 err = parse_object_type_and_size(&base_type, &base_size, &base_tslen,
901 err = resolve_delta_chain(deltas, repo, base_pack->fd,
902 base_pack->filesize, path_base_packfile, base_offset,
903 base_tslen, base_type, base_size, recursion - 1);
905 free(path_base_packfile);
909 static const struct got_error *
910 resolve_delta_chain(struct got_delta_chain *deltas, struct got_repository *repo,
911 int fd, size_t packfile_size, const char *path_packfile, off_t delta_offset,
912 size_t tslen, int delta_type, size_t delta_size, unsigned int recursion)
914 const struct got_error *err = NULL;
916 if (--recursion == 0)
917 return got_error(GOT_ERR_RECURSION);
919 switch (delta_type) {
920 case GOT_OBJ_TYPE_COMMIT:
921 case GOT_OBJ_TYPE_TREE:
922 case GOT_OBJ_TYPE_BLOB:
923 case GOT_OBJ_TYPE_TAG:
924 /* Plain types are the final delta base. Recursion ends. */
925 err = add_delta(deltas, path_packfile, delta_offset, tslen,
926 delta_type, delta_size, 0, NULL, 0);
928 case GOT_OBJ_TYPE_OFFSET_DELTA:
929 err = resolve_offset_delta(deltas, repo, fd, packfile_size,
930 path_packfile, delta_offset, tslen, delta_type, delta_size,
933 case GOT_OBJ_TYPE_REF_DELTA:
934 err = resolve_ref_delta(deltas, repo, fd, path_packfile,
935 delta_offset, tslen, delta_type, delta_size, recursion - 1);
938 return got_error(GOT_ERR_OBJ_TYPE);
944 static const struct got_error *
945 open_delta_object(struct got_object **obj, struct got_repository *repo,
946 const char *path_packfile, int fd, size_t packfile_size,
947 struct got_object_id *id, off_t offset, size_t tslen,
948 int delta_type, size_t delta_size)
950 const struct got_error *err = NULL;
953 *obj = calloc(1, sizeof(**obj));
955 return got_error_from_errno();
959 (*obj)->size = 0; /* Not known because deltas aren't applied yet. */
960 memcpy(&(*obj)->id, id, sizeof((*obj)->id));
961 (*obj)->pack_offset = offset + tslen;
963 (*obj)->path_packfile = strdup(path_packfile);
964 if ((*obj)->path_packfile == NULL) {
965 err = got_error_from_errno();
968 (*obj)->flags |= GOT_OBJ_FLAG_PACKED;
970 SIMPLEQ_INIT(&(*obj)->deltas.entries);
971 (*obj)->flags |= GOT_OBJ_FLAG_DELTIFIED;
973 err = resolve_delta_chain(&(*obj)->deltas, repo, fd, packfile_size,
974 path_packfile, offset, tslen, delta_type, delta_size,
975 GOT_DELTA_CHAIN_RECURSION_MAX);
979 err = got_delta_chain_get_base_type(&resolved_type, &(*obj)->deltas);
982 (*obj)->type = resolved_type;
986 got_object_close(*obj);
992 static const struct got_error *
993 open_packed_object(struct got_object **obj, struct got_repository *repo,
994 struct got_packidx *packidx, int idx, struct got_object_id *id)
996 const struct got_error *err = NULL;
999 struct got_pack *pack;
1006 offset = get_object_offset(packidx, idx);
1007 if (offset == (uint64_t)-1)
1008 return got_error(GOT_ERR_BAD_PACKIDX);
1010 err = get_packfile_path(&path_packfile, repo, packidx);
1014 pack = get_cached_pack(path_packfile, repo);
1016 err = cache_pack(&pack, path_packfile, packidx, repo);
1021 if (offset >= pack->filesize) {
1022 err = got_error(GOT_ERR_PACK_OFFSET);
1025 if (lseek(pack->fd, offset, SEEK_SET) == -1) {
1026 err = got_error_from_errno();
1030 err = parse_object_type_and_size(&type, &size, &tslen, pack->fd);
1035 case GOT_OBJ_TYPE_COMMIT:
1036 case GOT_OBJ_TYPE_TREE:
1037 case GOT_OBJ_TYPE_BLOB:
1038 case GOT_OBJ_TYPE_TAG:
1039 err = open_plain_object(obj, path_packfile, id, type,
1040 offset + tslen, size);
1043 case GOT_OBJ_TYPE_OFFSET_DELTA:
1044 case GOT_OBJ_TYPE_REF_DELTA:
1045 err = open_delta_object(obj, repo, path_packfile, pack->fd,
1046 pack->filesize, id, offset, tslen, type, size);
1050 err = got_error(GOT_ERR_OBJ_TYPE);
1054 free(path_packfile);
1058 const struct got_error *
1059 got_packfile_open_object(struct got_object **obj, struct got_object_id *id,
1060 struct got_repository *repo)
1062 const struct got_error *err = NULL;
1063 struct got_packidx *packidx = NULL;
1066 err = search_packidx(&packidx, &idx, repo, id);
1070 err = open_packed_object(obj, repo, packidx, idx, id);
1074 err = cache_pack(NULL, (*obj)->path_packfile, packidx, repo);
1078 static const struct got_error *
1079 get_delta_chain_max_size(uint64_t *max_size, struct got_delta_chain *deltas)
1081 struct got_delta *delta;
1082 uint64_t base_size = 0, result_size = 0;
1085 SIMPLEQ_FOREACH(delta, &deltas->entries, entry) {
1086 /* Plain object types are the delta base. */
1087 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1088 delta->type != GOT_OBJ_TYPE_TREE &&
1089 delta->type != GOT_OBJ_TYPE_BLOB &&
1090 delta->type != GOT_OBJ_TYPE_TAG) {
1091 const struct got_error *err;
1092 err = got_delta_get_sizes(&base_size, &result_size,
1093 delta->delta_buf, delta->delta_len);
1097 base_size = delta->size;
1098 if (base_size > *max_size)
1099 *max_size = base_size;
1100 if (result_size > *max_size)
1101 *max_size = result_size;
1107 static const struct got_error *
1108 dump_delta_chain_to_file(size_t *result_size, struct got_delta_chain *deltas,
1109 FILE *outfile, struct got_repository *repo)
1111 const struct got_error *err = NULL;
1112 struct got_delta *delta;
1113 FILE *base_file = NULL, *accum_file = NULL;
1114 uint8_t *base_buf = NULL, *accum_buf = NULL;
1115 size_t accum_size = 0;
1121 if (SIMPLEQ_EMPTY(&deltas->entries))
1122 return got_error(GOT_ERR_BAD_DELTA_CHAIN);
1124 /* We process small enough files entirely in memory for speed. */
1125 err = get_delta_chain_max_size(&max_size, deltas);
1128 if (max_size < GOT_DELTA_RESULT_SIZE_CACHED_MAX) {
1129 accum_buf = malloc(max_size);
1130 if (accum_buf == NULL)
1131 return got_error_from_errno();
1133 base_file = got_opentemp();
1134 if (base_file == NULL)
1135 return got_error_from_errno();
1137 accum_file = got_opentemp();
1138 if (accum_file == NULL) {
1139 err = got_error_from_errno();
1145 /* Deltas are ordered in ascending order. */
1146 SIMPLEQ_FOREACH(delta, &deltas->entries, entry) {
1148 struct got_pack *pack;
1150 off_t delta_data_offset;
1152 /* Plain object types are the delta base. */
1153 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1154 delta->type != GOT_OBJ_TYPE_TREE &&
1155 delta->type != GOT_OBJ_TYPE_BLOB &&
1156 delta->type != GOT_OBJ_TYPE_TAG) {
1157 err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1161 pack = get_cached_pack(delta->path_packfile, repo);
1163 err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1167 delta_data_offset = delta->offset + delta->tslen;
1168 if (delta_data_offset >= pack->filesize) {
1169 err = got_error(GOT_ERR_PACK_OFFSET);
1172 if (lseek(pack->fd, delta_data_offset, SEEK_SET) == -1) {
1173 err = got_error_from_errno();
1177 err = got_inflate_to_file_fd(&base_len,
1178 pack->fd, base_file);
1180 err = got_inflate_to_mem_fd(&base_buf,
1181 &base_len, pack->fd);
1182 if (base_len < max_size) {
1184 p = reallocarray(base_buf, 1, max_size);
1186 err = got_error_from_errno();
1201 err = got_delta_apply_in_mem(base_buf, delta->delta_buf,
1202 delta->delta_len, accum_buf, &accum_size);
1205 err = got_delta_apply(base_file, delta->delta_buf,
1207 /* Final delta application writes to output file. */
1208 ++n < deltas->nentries ? accum_file : outfile,
1214 if (n < deltas->nentries) {
1215 /* Accumulated delta becomes the new base. */
1217 uint8_t *tmp = accum_buf;
1218 accum_buf = base_buf;
1221 FILE *tmp = accum_file;
1222 accum_file = base_file;
1233 size_t len = fwrite(accum_buf, 1, accum_size, outfile);
1235 if (len != accum_size)
1236 return got_ferror(outfile, GOT_ERR_IO);
1244 *result_size = accum_size;
1248 static const struct got_error *
1249 dump_delta_chain_to_mem(uint8_t **outbuf, size_t *outlen,
1250 struct got_delta_chain *deltas, struct got_repository *repo)
1252 const struct got_error *err = NULL;
1253 struct got_delta *delta;
1254 uint8_t *base_buf = NULL, *accum_buf = NULL;
1262 if (SIMPLEQ_EMPTY(&deltas->entries))
1263 return got_error(GOT_ERR_BAD_DELTA_CHAIN);
1265 err = get_delta_chain_max_size(&max_size, deltas);
1268 accum_buf = malloc(max_size);
1269 if (accum_buf == NULL)
1270 return got_error_from_errno();
1272 /* Deltas are ordered in ascending order. */
1273 SIMPLEQ_FOREACH(delta, &deltas->entries, entry) {
1275 struct got_pack *pack;
1277 size_t delta_data_offset;
1279 /* Plain object types are the delta base. */
1280 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1281 delta->type != GOT_OBJ_TYPE_TREE &&
1282 delta->type != GOT_OBJ_TYPE_BLOB &&
1283 delta->type != GOT_OBJ_TYPE_TAG) {
1284 err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1288 pack = get_cached_pack(delta->path_packfile, repo);
1290 err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1294 delta_data_offset = delta->offset + delta->tslen;
1295 if (delta_data_offset >= pack->filesize) {
1296 err = got_error(GOT_ERR_PACK_OFFSET);
1299 if (lseek(pack->fd, delta_data_offset, SEEK_SET) == -1) {
1300 err = got_error_from_errno();
1303 err = got_inflate_to_mem_fd(&base_buf, &base_len,
1305 if (base_len < max_size) {
1307 p = reallocarray(base_buf, 1, max_size);
1309 err = got_error_from_errno();
1320 err = got_delta_apply_in_mem(base_buf, delta->delta_buf,
1321 delta->delta_len, accum_buf, &accum_size);
1326 if (n < deltas->nentries) {
1327 /* Accumulated delta becomes the new base. */
1328 uint8_t *tmp = accum_buf;
1329 accum_buf = base_buf;
1341 *outbuf = accum_buf;
1342 *outlen = accum_size;
1347 const struct got_error *
1348 got_packfile_extract_object(FILE **f, struct got_object *obj,
1349 struct got_repository *repo)
1351 const struct got_error *err = NULL;
1355 if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
1356 return got_error(GOT_ERR_OBJ_NOT_PACKED);
1358 *f = got_opentemp();
1360 err = got_error_from_errno();
1364 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0) {
1365 struct got_pack *pack;
1367 pack = get_cached_pack(obj->path_packfile, repo);
1369 err = cache_pack(&pack, obj->path_packfile, NULL, repo);
1374 if (obj->pack_offset >= pack->filesize) {
1375 err = got_error(GOT_ERR_PACK_OFFSET);
1378 if (lseek(pack->fd, obj->pack_offset, SEEK_SET) == -1) {
1379 err = got_error_from_errno();
1383 err = got_inflate_to_file_fd(&obj->size, pack->fd, *f);
1385 err = dump_delta_chain_to_file(&obj->size,
1386 &obj->deltas, *f, repo);
1395 const struct got_error *
1396 got_packfile_extract_object_to_mem(uint8_t **buf, size_t *len,
1397 struct got_object *obj, struct got_repository *repo)
1399 const struct got_error *err = NULL;
1401 if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
1402 return got_error(GOT_ERR_OBJ_NOT_PACKED);
1404 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0) {
1405 struct got_pack *pack;
1407 pack = get_cached_pack(obj->path_packfile, repo);
1409 err = cache_pack(&pack, obj->path_packfile, NULL, repo);
1414 if (obj->pack_offset >= pack->filesize) {
1415 err = got_error(GOT_ERR_PACK_OFFSET);
1418 if (lseek(pack->fd, obj->pack_offset, SEEK_SET) == -1) {
1419 err = got_error_from_errno();
1423 err = got_inflate_to_mem_fd(buf, len, pack->fd);
1425 err = dump_delta_chain_to_mem(buf, len, &obj->deltas, repo);