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>
35 #include "got_error.h"
36 #include "got_object.h"
37 #include "got_opentemp.h"
39 #include "got_lib_sha1.h"
40 #include "got_lib_pack.h"
41 #include "got_lib_path.h"
42 #include "got_lib_delta.h"
43 #include "got_lib_inflate.h"
44 #include "got_lib_object.h"
45 #include "got_lib_privsep.h"
48 #define nitems(_a) (sizeof(_a) / sizeof((_a)[0]))
52 #define MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
55 static const struct got_error *
56 verify_fanout_table(uint32_t *fanout_table)
60 for (i = 0; i < 0xff - 1; i++) {
61 if (be32toh(fanout_table[i]) > be32toh(fanout_table[i + 1]))
62 return got_error(GOT_ERR_BAD_PACKIDX);
68 const struct got_error *
69 got_pack_get_packfile_size(size_t *size, const char *path)
76 dot = strrchr(path, '.');
78 return got_error(GOT_ERR_BAD_PATH);
80 /* Path must point to a pack index or to a pack file. */
81 if (strcmp(dot, GOT_PACKIDX_SUFFIX) == 0) {
82 const struct got_error *err = NULL;
84 char base_path[PATH_MAX];
86 /* Convert pack index path to pack file path. */
87 if (strlcpy(base_path, path, PATH_MAX) > PATH_MAX)
88 return got_error(GOT_ERR_NO_SPACE);
89 dot = strrchr(base_path, '.');
91 return got_error(GOT_ERR_BAD_PATH);
93 if (asprintf(&path_pack, "%s.pack", base_path) == -1)
94 return got_error_from_errno();
96 if (stat(path_pack, &sb) != 0)
97 err = got_error_from_errno();
101 } else if (strcmp(dot, GOT_PACKFILE_SUFFIX) == 0) {
102 if (stat(path, &sb) != 0)
103 return got_error_from_errno();
105 return got_error(GOT_ERR_BAD_PATH);
111 const struct got_error *
112 got_packidx_init_hdr(struct got_packidx *p, int verify)
114 const struct got_error *err = NULL;
115 struct got_packidx_v2_hdr *h;
117 uint8_t sha1[SHA1_DIGEST_LENGTH];
118 size_t nobj, len_fanout, len_ids, offset, remain;
127 if (remain < sizeof(*h->magic)) {
128 err = got_error(GOT_ERR_BAD_PACKIDX);
132 h->magic = (uint32_t *)(p->map + offset);
134 h->magic = malloc(sizeof(*h->magic));
135 if (h->magic == NULL) {
136 err = got_error_from_errno();
139 n = read(p->fd, h->magic, sizeof(*h->magic));
140 if (n != sizeof(*h->magic)) {
141 err = got_error(GOT_ERR_BAD_PACKIDX);
145 if (betoh32(*h->magic) != GOT_PACKIDX_V2_MAGIC) {
146 err = got_error(GOT_ERR_BAD_PACKIDX);
149 offset += sizeof(*h->magic);
150 remain -= sizeof(*h->magic);
153 SHA1Update(&ctx, (uint8_t *)h->magic, sizeof(*h->magic));
155 if (remain < sizeof(*h->version)) {
156 err = got_error(GOT_ERR_BAD_PACKIDX);
160 h->version = (uint32_t *)(p->map + offset);
162 h->version = malloc(sizeof(*h->version));
163 if (h->version == NULL) {
164 err = got_error_from_errno();
167 n = read(p->fd, h->version, sizeof(*h->version));
168 if (n != sizeof(*h->version)) {
169 err = got_error(GOT_ERR_BAD_PACKIDX);
173 if (betoh32(*h->version) != GOT_PACKIDX_VERSION) {
174 err = got_error(GOT_ERR_BAD_PACKIDX);
177 offset += sizeof(*h->version);
178 remain -= sizeof(*h->version);
181 SHA1Update(&ctx, (uint8_t *)h->version, sizeof(*h->version));
184 sizeof(*h->fanout_table) * GOT_PACKIDX_V2_FANOUT_TABLE_ITEMS;
185 if (remain < len_fanout) {
186 err = got_error(GOT_ERR_BAD_PACKIDX);
190 h->fanout_table = (uint32_t *)(p->map + offset);
192 h->fanout_table = malloc(len_fanout);
193 if (h->fanout_table == NULL) {
194 err = got_error_from_errno();
197 n = read(p->fd, h->fanout_table, len_fanout);
198 if (n != len_fanout) {
199 err = got_error(GOT_ERR_BAD_PACKIDX);
203 err = verify_fanout_table(h->fanout_table);
207 SHA1Update(&ctx, (uint8_t *)h->fanout_table, len_fanout);
208 offset += len_fanout;
209 remain -= len_fanout;
211 nobj = betoh32(h->fanout_table[0xff]);
212 len_ids = nobj * sizeof(*h->sorted_ids);
213 if (len_ids <= nobj || len_ids > remain) {
214 err = got_error(GOT_ERR_BAD_PACKIDX);
219 (struct got_packidx_object_id *)((uint8_t*)(p->map + offset));
221 h->sorted_ids = malloc(len_ids);
222 if (h->sorted_ids == NULL) {
223 err = got_error(GOT_ERR_BAD_PACKIDX);
226 n = read(p->fd, h->sorted_ids, len_ids);
228 err = got_error(GOT_ERR_BAD_PACKIDX);
233 SHA1Update(&ctx, (uint8_t *)h->sorted_ids, len_ids);
237 if (remain < nobj * sizeof(*h->crc32)) {
238 err = got_error(GOT_ERR_BAD_PACKIDX);
242 h->crc32 = (uint32_t *)((uint8_t*)(p->map + offset));
244 h->crc32 = malloc(nobj * sizeof(*h->crc32));
245 if (h->crc32 == NULL) {
246 err = got_error_from_errno();
249 n = read(p->fd, h->crc32, nobj * sizeof(*h->crc32));
250 if (n != nobj * sizeof(*h->crc32)) {
251 err = got_error(GOT_ERR_BAD_PACKIDX);
256 SHA1Update(&ctx, (uint8_t *)h->crc32, nobj * sizeof(*h->crc32));
257 remain -= nobj * sizeof(*h->crc32);
258 offset += nobj * sizeof(*h->crc32);
260 if (remain < nobj * sizeof(*h->offsets)) {
261 err = got_error(GOT_ERR_BAD_PACKIDX);
265 h->offsets = (uint32_t *)((uint8_t*)(p->map + offset));
267 h->offsets = malloc(nobj * sizeof(*h->offsets));
268 if (h->offsets == NULL) {
269 err = got_error_from_errno();
272 n = read(p->fd, h->offsets, nobj * sizeof(*h->offsets));
273 if (n != nobj * sizeof(*h->offsets)) {
274 err = got_error(GOT_ERR_BAD_PACKIDX);
279 SHA1Update(&ctx, (uint8_t *)h->offsets,
280 nobj * sizeof(*h->offsets));
281 remain -= nobj * sizeof(*h->offsets);
282 offset += nobj * sizeof(*h->offsets);
284 /* Large file offsets are contained only in files > 2GB. */
285 if (p->len <= 0x80000000)
288 if (remain < nobj * sizeof(*h->large_offsets)) {
289 err = got_error(GOT_ERR_BAD_PACKIDX);
293 h->large_offsets = (uint64_t *)((uint8_t*)(p->map + offset));
295 h->offsets = malloc(nobj * sizeof(*h->large_offsets));
296 if (h->offsets == NULL) {
297 err = got_error_from_errno();
300 n = read(p->fd, h->large_offsets,
301 nobj * sizeof(*h->large_offsets));
302 if (n != nobj * sizeof(*h->large_offsets)) {
303 err = got_error(GOT_ERR_BAD_PACKIDX);
308 SHA1Update(&ctx, (uint8_t*)h->large_offsets,
309 nobj * sizeof(*h->large_offsets));
310 remain -= nobj * sizeof(*h->large_offsets);
311 offset += nobj * sizeof(*h->large_offsets);
314 if (remain < sizeof(*h->trailer)) {
315 err = got_error(GOT_ERR_BAD_PACKIDX);
320 (struct got_packidx_trailer *)((uint8_t*)(p->map + offset));
322 h->trailer = malloc(sizeof(*h->trailer));
323 if (h->trailer == NULL) {
324 err = got_error_from_errno();
327 n = read(p->fd, h->trailer, sizeof(*h->trailer));
328 if (n != sizeof(*h->trailer)) {
329 err = got_error(GOT_ERR_BAD_PACKIDX);
334 SHA1Update(&ctx, h->trailer->packfile_sha1, SHA1_DIGEST_LENGTH);
335 SHA1Final(sha1, &ctx);
336 if (memcmp(h->trailer->packidx_sha1, sha1,
337 SHA1_DIGEST_LENGTH) != 0)
338 err = got_error(GOT_ERR_PACKIDX_CSUM);
344 const struct got_error *
345 got_packidx_open(struct got_packidx **packidx, const char *path, int verify)
347 const struct got_error *err = NULL;
348 struct got_packidx *p;
352 p = calloc(1, sizeof(*p));
354 return got_error_from_errno();
356 p->fd = open(path, O_RDONLY | O_NOFOLLOW, GOT_DEFAULT_FILE_MODE);
358 return got_error_from_errno();
360 err = got_pack_get_packfile_size(&p->len, path);
366 if (p->len < sizeof(p->hdr)) {
367 err = got_error(GOT_ERR_BAD_PACKIDX);
373 p->path_packidx = strdup(path);
374 if (p->path_packidx == NULL) {
375 err = got_error_from_errno();
379 #ifndef GOT_PACK_NO_MMAP
380 p->map = mmap(NULL, p->len, PROT_READ, MAP_PRIVATE, p->fd, 0);
381 if (p->map == MAP_FAILED)
382 p->map = NULL; /* fall back to read(2) */
385 err = got_packidx_init_hdr(p, verify);
388 got_packidx_close(p);
395 const struct got_error *
396 got_packidx_close(struct got_packidx *packidx)
398 const struct got_error *err = NULL;
400 free(packidx->path_packidx);
402 if (munmap(packidx->map, packidx->len) == -1)
403 err = got_error_from_errno();
405 free(packidx->hdr.magic);
406 free(packidx->hdr.version);
407 free(packidx->hdr.fanout_table);
408 free(packidx->hdr.sorted_ids);
409 free(packidx->hdr.crc32);
410 free(packidx->hdr.offsets);
411 free(packidx->hdr.large_offsets);
412 free(packidx->hdr.trailer);
421 get_object_offset(struct got_packidx *packidx, int idx)
423 uint32_t totobj = betoh32(packidx->hdr.fanout_table[0xff]);
424 uint32_t offset = betoh32(packidx->hdr.offsets[idx]);
425 if (offset & GOT_PACKIDX_OFFSET_VAL_IS_LARGE_IDX) {
427 idx = offset & GOT_PACKIDX_OFFSET_VAL_MASK;
428 if (idx < 0 || idx > totobj ||
429 packidx->hdr.large_offsets == NULL)
431 loffset = betoh64(packidx->hdr.large_offsets[idx]);
432 return (loffset > INT64_MAX ? -1 : (off_t)loffset);
434 return (off_t)(offset & GOT_PACKIDX_OFFSET_VAL_MASK);
438 got_packidx_get_object_idx(struct got_packidx *packidx, struct got_object_id *id)
440 u_int8_t id0 = id->sha1[0];
441 uint32_t totobj = betoh32(packidx->hdr.fanout_table[0xff]);
442 int left = 0, right = totobj - 1;
445 left = betoh32(packidx->hdr.fanout_table[id0 - 1]);
447 while (left <= right) {
448 struct got_packidx_object_id *oid;
451 i = ((left + right) / 2);
452 oid = &packidx->hdr.sorted_ids[i];
453 cmp = memcmp(id->sha1, oid->sha1, SHA1_DIGEST_LENGTH);
465 const struct got_error *
466 got_pack_stop_privsep_child(struct got_pack *pack)
468 const struct got_error *err = NULL, *child_err = NULL;
470 if (pack->privsep_child == NULL)
473 err = got_privsep_send_stop(pack->privsep_child->imsg_fd);
474 child_err = got_privsep_wait_for_child(
475 pack->privsep_child->pid);
476 if (child_err && err == NULL)
478 free(pack->privsep_child);
479 pack->privsep_child = NULL;
483 const struct got_error *
484 got_pack_close(struct got_pack *pack)
486 const struct got_error *err = NULL;
488 err = got_pack_stop_privsep_child(pack);
489 if (pack->map && munmap(pack->map, pack->filesize) == -1 && !err)
490 err = got_error_from_errno();
493 free(pack->path_packfile);
494 pack->path_packfile = NULL;
500 static const struct got_error *
501 parse_object_type_and_size(uint8_t *type, uint64_t *size, size_t *len,
502 struct got_pack *pack, off_t offset)
512 if (offset >= pack->filesize)
513 return got_error(GOT_ERR_PACK_OFFSET);
516 mapoff = (size_t)offset;
518 if (lseek(pack->fd, offset, SEEK_SET) == -1)
519 return got_error_from_errno();
523 /* We do not support size values which don't fit in 64 bit. */
525 return got_error(GOT_ERR_NO_SPACE);
528 sizeN = *(pack->map + mapoff);
529 mapoff += sizeof(sizeN);
531 ssize_t n = read(pack->fd, &sizeN, sizeof(sizeN));
533 return got_error_from_errno();
534 if (n != sizeof(sizeN))
535 return got_error(GOT_ERR_BAD_PACKFILE);
537 *len += sizeof(sizeN);
540 t = (sizeN & GOT_PACK_OBJ_SIZE0_TYPE_MASK) >>
541 GOT_PACK_OBJ_SIZE0_TYPE_MASK_SHIFT;
542 s = (sizeN & GOT_PACK_OBJ_SIZE0_VAL_MASK);
544 size_t shift = 4 + 7 * (i - 1);
545 s |= ((sizeN & GOT_PACK_OBJ_SIZE_VAL_MASK) << shift);
548 } while (sizeN & GOT_PACK_OBJ_SIZE_MORE);
555 static const struct got_error *
556 open_plain_object(struct got_object **obj, const char *path_packfile,
557 struct got_object_id *id, uint8_t type, off_t offset, size_t size, int idx)
559 *obj = calloc(1, sizeof(**obj));
561 return got_error_from_errno();
563 (*obj)->path_packfile = strdup(path_packfile);
564 if ((*obj)->path_packfile == NULL) {
565 const struct got_error *err = got_error_from_errno();
572 (*obj)->flags = GOT_OBJ_FLAG_PACKED;
573 (*obj)->pack_idx = idx;
577 memcpy(&(*obj)->id, id, sizeof((*obj)->id));
578 (*obj)->pack_offset = offset;
583 static const struct got_error *
584 parse_negative_offset(int64_t *offset, size_t *len, struct got_pack *pack,
594 /* We do not support offset values which don't fit in 64 bit. */
596 return got_error(GOT_ERR_NO_SPACE);
600 if (delta_offset >= pack->filesize)
601 return got_error(GOT_ERR_PACK_OFFSET);
602 mapoff = (size_t)delta_offset + *len;
603 offN = *(pack->map + mapoff);
606 n = read(pack->fd, &offN, sizeof(offN));
608 return got_error_from_errno();
609 if (n != sizeof(offN))
610 return got_error(GOT_ERR_BAD_PACKFILE);
612 *len += sizeof(offN);
615 o = (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
619 o += (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
622 } while (offN & GOT_PACK_OBJ_DELTA_OFF_MORE);
628 static const struct got_error *
629 parse_offset_delta(off_t *base_offset, size_t *len, struct got_pack *pack,
630 off_t offset, int tslen)
632 const struct got_error *err;
638 err = parse_negative_offset(&negoffset, &negofflen, pack,
643 /* Compute the base object's offset (must be in the same pack file). */
644 *base_offset = (offset - negoffset);
645 if (*base_offset <= 0)
646 return got_error(GOT_ERR_BAD_PACKFILE);
652 static const struct got_error *
653 resolve_delta_chain(struct got_delta_chain *, struct got_packidx *,
654 struct got_pack *, off_t, size_t, int, size_t, unsigned int);
656 static const struct got_error *
657 add_delta(struct got_delta_chain *deltas, off_t delta_offset, size_t tslen,
658 int delta_type, size_t delta_size, size_t delta_data_offset,
659 uint8_t *delta_buf, size_t delta_len)
661 struct got_delta *delta;
663 delta = got_delta_open(delta_offset, tslen, delta_type, delta_size,
664 delta_data_offset, delta_buf,
667 return got_error_from_errno();
668 /* delta is freed in got_object_close() */
670 SIMPLEQ_INSERT_HEAD(&deltas->entries, delta, entry);
674 static const struct got_error *
675 resolve_offset_delta(struct got_delta_chain *deltas,
676 struct got_packidx *packidx, struct got_pack *pack, off_t delta_offset,
677 size_t tslen, int delta_type, size_t delta_size, unsigned int recursion)
680 const struct got_error *err;
685 off_t delta_data_offset;
687 size_t delta_len, consumed;
689 err = parse_offset_delta(&base_offset, &consumed, pack,
690 delta_offset, tslen);
694 delta_data_offset = delta_offset + tslen + consumed;
695 if (delta_data_offset >= pack->filesize)
696 return got_error(GOT_ERR_PACK_OFFSET);
698 if (pack->map == NULL) {
699 delta_data_offset = lseek(pack->fd, 0, SEEK_CUR);
700 if (delta_data_offset == -1)
701 return got_error_from_errno();
705 size_t mapoff = (size_t)delta_data_offset;
706 err = got_inflate_to_mem_mmap(&delta_buf, &delta_len, pack->map,
707 mapoff, pack->filesize - mapoff);
712 err = got_inflate_to_mem_fd(&delta_buf, &delta_len, pack->fd);
717 err = add_delta(deltas, delta_offset, tslen, delta_type, delta_size,
718 delta_data_offset, delta_buf, delta_len);
722 /* An offset delta must be in the same packfile. */
723 if (base_offset >= pack->filesize) {
724 err = got_error(GOT_ERR_PACK_OFFSET);
728 err = parse_object_type_and_size(&base_type, &base_size, &base_tslen,
733 err = resolve_delta_chain(deltas, packidx, pack, base_offset,
734 base_tslen, base_type, base_size, recursion - 1);
741 static const struct got_error *
742 resolve_ref_delta(struct got_delta_chain *deltas, struct got_packidx *packidx,
743 struct got_pack *pack, off_t delta_offset, size_t tslen, int delta_type,
744 size_t delta_size, unsigned int recursion)
746 const struct got_error *err;
747 struct got_object_id id;
753 off_t delta_data_offset;
754 uint8_t *delta_buf = NULL;
757 if (delta_offset >= pack->filesize)
758 return got_error(GOT_ERR_PACK_OFFSET);
759 delta_data_offset = delta_offset + tslen;
760 if (delta_data_offset >= pack->filesize)
761 return got_error(GOT_ERR_PACK_OFFSET);
763 if (pack->map == NULL) {
764 delta_data_offset = lseek(pack->fd, 0, SEEK_CUR);
765 if (delta_data_offset == -1)
766 return got_error_from_errno();
771 size_t mapoff = (size_t)delta_data_offset;
772 memcpy(&id, pack->map + mapoff, sizeof(id));
773 mapoff += sizeof(id);
774 err = got_inflate_to_mem_mmap(&delta_buf, &delta_len, pack->map,
775 mapoff, pack->filesize - mapoff);
779 ssize_t n = read(pack->fd, &id, sizeof(id));
781 return got_error_from_errno();
783 return got_error(GOT_ERR_BAD_PACKFILE);
784 err = got_inflate_to_mem_fd(&delta_buf, &delta_len, pack->fd);
789 err = add_delta(deltas, delta_offset, tslen, delta_type, delta_size,
790 delta_data_offset, delta_buf, delta_len);
794 /* Delta base must be in the same pack file. */
795 idx = got_packidx_get_object_idx(packidx, &id);
797 err = got_error(GOT_ERR_BAD_PACKFILE);
801 base_offset = get_object_offset(packidx, idx);
802 if (base_offset == (uint64_t)-1) {
803 err = got_error(GOT_ERR_BAD_PACKIDX);
807 if (base_offset >= pack->filesize) {
808 err = got_error(GOT_ERR_PACK_OFFSET);
812 err = parse_object_type_and_size(&base_type, &base_size, &base_tslen,
817 err = resolve_delta_chain(deltas, packidx, pack, base_offset,
818 base_tslen, base_type, base_size, recursion - 1);
825 static const struct got_error *
826 resolve_delta_chain(struct got_delta_chain *deltas, struct got_packidx *packidx,
827 struct got_pack *pack, off_t delta_offset, size_t tslen, int delta_type,
828 size_t delta_size, unsigned int recursion)
830 const struct got_error *err = NULL;
832 if (--recursion == 0)
833 return got_error(GOT_ERR_RECURSION);
835 switch (delta_type) {
836 case GOT_OBJ_TYPE_COMMIT:
837 case GOT_OBJ_TYPE_TREE:
838 case GOT_OBJ_TYPE_BLOB:
839 case GOT_OBJ_TYPE_TAG:
840 /* Plain types are the final delta base. Recursion ends. */
841 err = add_delta(deltas, delta_offset, tslen, delta_type,
842 delta_size, 0, NULL, 0);
844 case GOT_OBJ_TYPE_OFFSET_DELTA:
845 err = resolve_offset_delta(deltas, packidx, pack,
846 delta_offset, tslen, delta_type, delta_size, recursion - 1);
848 case GOT_OBJ_TYPE_REF_DELTA:
849 err = resolve_ref_delta(deltas, packidx, pack,
850 delta_offset, tslen, delta_type, delta_size, recursion - 1);
853 return got_error(GOT_ERR_OBJ_TYPE);
859 static const struct got_error *
860 open_delta_object(struct got_object **obj, struct got_packidx *packidx,
861 struct got_pack *pack, struct got_object_id *id, off_t offset,
862 size_t tslen, int delta_type, size_t delta_size, int idx)
864 const struct got_error *err = NULL;
867 *obj = calloc(1, sizeof(**obj));
869 return got_error_from_errno();
873 (*obj)->size = 0; /* Not known because deltas aren't applied yet. */
875 memcpy(&(*obj)->id, id, sizeof((*obj)->id));
876 (*obj)->pack_offset = offset + tslen;
878 (*obj)->path_packfile = strdup(pack->path_packfile);
879 if ((*obj)->path_packfile == NULL) {
880 err = got_error_from_errno();
883 (*obj)->flags |= GOT_OBJ_FLAG_PACKED;
884 (*obj)->pack_idx = idx;
886 SIMPLEQ_INIT(&(*obj)->deltas.entries);
887 (*obj)->flags |= GOT_OBJ_FLAG_DELTIFIED;
889 err = resolve_delta_chain(&(*obj)->deltas, packidx, pack, offset,
890 tslen, delta_type, delta_size, GOT_DELTA_CHAIN_RECURSION_MAX);
894 err = got_delta_chain_get_base_type(&resolved_type, &(*obj)->deltas);
897 (*obj)->type = resolved_type;
900 got_object_close(*obj);
906 const struct got_error *
907 got_packfile_open_object(struct got_object **obj, struct got_pack *pack,
908 struct got_packidx *packidx, int idx, struct got_object_id *id)
910 const struct got_error *err = NULL;
918 offset = get_object_offset(packidx, idx);
919 if (offset == (uint64_t)-1)
920 return got_error(GOT_ERR_BAD_PACKIDX);
922 err = parse_object_type_and_size(&type, &size, &tslen, pack, offset);
927 case GOT_OBJ_TYPE_COMMIT:
928 case GOT_OBJ_TYPE_TREE:
929 case GOT_OBJ_TYPE_BLOB:
930 case GOT_OBJ_TYPE_TAG:
931 err = open_plain_object(obj, pack->path_packfile, id, type,
932 offset + tslen, size, idx);
934 case GOT_OBJ_TYPE_OFFSET_DELTA:
935 case GOT_OBJ_TYPE_REF_DELTA:
936 err = open_delta_object(obj, packidx, pack, id, offset,
937 tslen, type, size, idx);
940 err = got_error(GOT_ERR_OBJ_TYPE);
947 static const struct got_error *
948 get_delta_chain_max_size(uint64_t *max_size, struct got_delta_chain *deltas)
950 struct got_delta *delta;
951 uint64_t base_size = 0, result_size = 0;
954 SIMPLEQ_FOREACH(delta, &deltas->entries, entry) {
955 /* Plain object types are the delta base. */
956 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
957 delta->type != GOT_OBJ_TYPE_TREE &&
958 delta->type != GOT_OBJ_TYPE_BLOB &&
959 delta->type != GOT_OBJ_TYPE_TAG) {
960 const struct got_error *err;
961 err = got_delta_get_sizes(&base_size, &result_size,
962 delta->delta_buf, delta->delta_len);
966 base_size = delta->size;
967 if (base_size > *max_size)
968 *max_size = base_size;
969 if (result_size > *max_size)
970 *max_size = result_size;
976 static const struct got_error *
977 dump_delta_chain_to_file(size_t *result_size, struct got_delta_chain *deltas,
978 struct got_pack *pack, FILE *outfile, FILE *base_file, FILE *accum_file)
980 const struct got_error *err = NULL;
981 struct got_delta *delta;
982 uint8_t *base_buf = NULL, *accum_buf = NULL;
983 size_t accum_size = 0;
989 if (SIMPLEQ_EMPTY(&deltas->entries))
990 return got_error(GOT_ERR_BAD_DELTA_CHAIN);
992 /* We process small enough files entirely in memory for speed. */
993 err = get_delta_chain_max_size(&max_size, deltas);
996 if (max_size < GOT_DELTA_RESULT_SIZE_CACHED_MAX) {
997 accum_buf = malloc(max_size);
998 if (accum_buf == NULL)
999 return got_error_from_errno();
1004 /* Deltas are ordered in ascending order. */
1005 SIMPLEQ_FOREACH(delta, &deltas->entries, entry) {
1007 size_t base_len, mapoff;
1008 off_t delta_data_offset;
1010 /* Plain object types are the delta base. */
1011 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1012 delta->type != GOT_OBJ_TYPE_TREE &&
1013 delta->type != GOT_OBJ_TYPE_BLOB &&
1014 delta->type != GOT_OBJ_TYPE_TAG) {
1015 err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1019 delta_data_offset = delta->offset + delta->tslen;
1020 if (delta_data_offset >= pack->filesize) {
1021 err = got_error(GOT_ERR_PACK_OFFSET);
1024 if (pack->map == NULL) {
1025 if (lseek(pack->fd, delta_data_offset, SEEK_SET)
1027 err = got_error_from_errno();
1033 mapoff = (size_t)delta_data_offset;
1034 err = got_inflate_to_file_mmap(
1035 &base_len, pack->map, mapoff,
1036 pack->filesize - mapoff, base_file);
1038 err = got_inflate_to_file_fd(&base_len,
1039 pack->fd, base_file);
1042 mapoff = (size_t)delta_data_offset;
1043 err = got_inflate_to_mem_mmap(&base_buf,
1044 &base_len, pack->map, mapoff,
1045 pack->filesize - mapoff);
1047 err = got_inflate_to_mem_fd(&base_buf,
1048 &base_len, pack->fd);
1049 if (base_len < max_size) {
1051 p = reallocarray(base_buf, 1, max_size);
1053 err = got_error_from_errno();
1068 err = got_delta_apply_in_mem(base_buf, delta->delta_buf,
1069 delta->delta_len, accum_buf, &accum_size);
1072 err = got_delta_apply(base_file, delta->delta_buf,
1074 /* Final delta application writes to output file. */
1075 ++n < deltas->nentries ? accum_file : outfile,
1081 if (n < deltas->nentries) {
1082 /* Accumulated delta becomes the new base. */
1084 uint8_t *tmp = accum_buf;
1085 accum_buf = base_buf;
1088 FILE *tmp = accum_file;
1089 accum_file = base_file;
1100 size_t len = fwrite(accum_buf, 1, accum_size, outfile);
1102 if (len != accum_size)
1103 err = got_ferror(outfile, GOT_ERR_IO);
1111 *result_size = accum_size;
1115 static const struct got_error *
1116 dump_delta_chain_to_mem(uint8_t **outbuf, size_t *outlen,
1117 struct got_delta_chain *deltas, struct got_pack *pack)
1119 const struct got_error *err = NULL;
1120 struct got_delta *delta;
1121 uint8_t *base_buf = NULL, *accum_buf = NULL;
1129 if (SIMPLEQ_EMPTY(&deltas->entries))
1130 return got_error(GOT_ERR_BAD_DELTA_CHAIN);
1132 err = get_delta_chain_max_size(&max_size, deltas);
1135 accum_buf = malloc(max_size);
1136 if (accum_buf == NULL)
1137 return got_error_from_errno();
1139 /* Deltas are ordered in ascending order. */
1140 SIMPLEQ_FOREACH(delta, &deltas->entries, entry) {
1143 size_t delta_data_offset;
1145 /* Plain object types are the delta base. */
1146 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1147 delta->type != GOT_OBJ_TYPE_TREE &&
1148 delta->type != GOT_OBJ_TYPE_BLOB &&
1149 delta->type != GOT_OBJ_TYPE_TAG) {
1150 err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1154 delta_data_offset = delta->offset + delta->tslen;
1155 if (delta_data_offset >= pack->filesize) {
1156 err = got_error(GOT_ERR_PACK_OFFSET);
1160 size_t mapoff = (size_t)delta_data_offset;
1161 err = got_inflate_to_mem_mmap(&base_buf,
1162 &base_len, pack->map, mapoff,
1163 pack->filesize - mapoff);
1165 if (lseek(pack->fd, delta_data_offset, SEEK_SET)
1167 err = got_error_from_errno();
1170 err = got_inflate_to_mem_fd(&base_buf,
1171 &base_len, pack->fd);
1175 if (base_len < max_size) {
1177 p = reallocarray(base_buf, 1, max_size);
1179 err = got_error_from_errno();
1188 err = got_delta_apply_in_mem(base_buf, delta->delta_buf,
1189 delta->delta_len, accum_buf, &accum_size);
1194 if (n < deltas->nentries) {
1195 /* Accumulated delta becomes the new base. */
1196 uint8_t *tmp = accum_buf;
1197 accum_buf = base_buf;
1209 *outbuf = accum_buf;
1210 *outlen = accum_size;
1215 const struct got_error *
1216 got_packfile_extract_object(struct got_pack *pack, struct got_object *obj,
1217 FILE *outfile, FILE *base_file, FILE *accum_file)
1219 const struct got_error *err = NULL;
1221 if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
1222 return got_error(GOT_ERR_OBJ_NOT_PACKED);
1224 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0) {
1225 if (obj->pack_offset >= pack->filesize)
1226 return got_error(GOT_ERR_PACK_OFFSET);
1229 size_t mapoff = (size_t)obj->pack_offset;
1230 err = got_inflate_to_file_mmap(&obj->size, pack->map,
1231 mapoff, pack->filesize - mapoff, outfile);
1233 if (lseek(pack->fd, obj->pack_offset, SEEK_SET) == -1)
1234 return got_error_from_errno();
1235 err = got_inflate_to_file_fd(&obj->size, pack->fd,
1239 err = dump_delta_chain_to_file(&obj->size, &obj->deltas, pack,
1240 outfile, base_file, accum_file);
1245 const struct got_error *
1246 got_packfile_extract_object_to_mem(uint8_t **buf, size_t *len,
1247 struct got_object *obj, struct got_pack *pack)
1249 const struct got_error *err = NULL;
1251 if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
1252 return got_error(GOT_ERR_OBJ_NOT_PACKED);
1254 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0) {
1255 if (obj->pack_offset >= pack->filesize)
1256 return got_error(GOT_ERR_PACK_OFFSET);
1258 size_t mapoff = (size_t)obj->pack_offset;
1259 err = got_inflate_to_mem_mmap(buf, len, pack->map,
1260 mapoff, pack->filesize - mapoff);
1262 if (lseek(pack->fd, obj->pack_offset, SEEK_SET) == -1)
1263 return got_error_from_errno();
1264 err = got_inflate_to_mem_fd(buf, len, pack->fd);
1267 err = dump_delta_chain_to_mem(buf, len, &obj->deltas, pack);