2 * Copyright (c) 2018, 2019, 2020 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>
36 #include "got_error.h"
37 #include "got_object.h"
38 #include "got_opentemp.h"
41 #include "got_lib_sha1.h"
42 #include "got_lib_delta.h"
43 #include "got_lib_delta_cache.h"
44 #include "got_lib_inflate.h"
45 #include "got_lib_object.h"
46 #include "got_lib_object_parse.h"
47 #include "got_lib_privsep.h"
48 #include "got_lib_pack.h"
51 #define nitems(_a) (sizeof(_a) / sizeof((_a)[0]))
55 #define MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
58 static const struct got_error *
59 verify_fanout_table(uint32_t *fanout_table)
63 for (i = 0; i < 0xff - 1; i++) {
64 if (be32toh(fanout_table[i]) > be32toh(fanout_table[i + 1]))
65 return got_error(GOT_ERR_BAD_PACKIDX);
71 const struct got_error *
72 got_packidx_init_hdr(struct got_packidx *p, int verify)
74 const struct got_error *err = NULL;
75 struct got_packidx_v2_hdr *h;
77 uint8_t sha1[SHA1_DIGEST_LENGTH];
78 size_t nobj, len_fanout, len_ids, offset, remain;
88 if (remain < sizeof(*h->magic)) {
89 err = got_error(GOT_ERR_BAD_PACKIDX);
93 h->magic = (uint32_t *)(p->map + offset);
95 h->magic = malloc(sizeof(*h->magic));
96 if (h->magic == NULL) {
97 err = got_error_from_errno("malloc");
100 n = read(p->fd, h->magic, sizeof(*h->magic));
102 err = got_error_from_errno("read");
104 } else if (n != sizeof(*h->magic)) {
105 err = got_error(GOT_ERR_BAD_PACKIDX);
109 if (be32toh(*h->magic) != GOT_PACKIDX_V2_MAGIC) {
110 err = got_error(GOT_ERR_BAD_PACKIDX);
113 offset += sizeof(*h->magic);
114 remain -= sizeof(*h->magic);
117 SHA1Update(&ctx, (uint8_t *)h->magic, sizeof(*h->magic));
119 if (remain < sizeof(*h->version)) {
120 err = got_error(GOT_ERR_BAD_PACKIDX);
124 h->version = (uint32_t *)(p->map + offset);
126 h->version = malloc(sizeof(*h->version));
127 if (h->version == NULL) {
128 err = got_error_from_errno("malloc");
131 n = read(p->fd, h->version, sizeof(*h->version));
133 err = got_error_from_errno("read");
135 } else if (n != sizeof(*h->version)) {
136 err = got_error(GOT_ERR_BAD_PACKIDX);
140 if (be32toh(*h->version) != GOT_PACKIDX_VERSION) {
141 err = got_error(GOT_ERR_BAD_PACKIDX);
144 offset += sizeof(*h->version);
145 remain -= sizeof(*h->version);
148 SHA1Update(&ctx, (uint8_t *)h->version, sizeof(*h->version));
151 sizeof(*h->fanout_table) * GOT_PACKIDX_V2_FANOUT_TABLE_ITEMS;
152 if (remain < len_fanout) {
153 err = got_error(GOT_ERR_BAD_PACKIDX);
157 h->fanout_table = (uint32_t *)(p->map + offset);
159 h->fanout_table = malloc(len_fanout);
160 if (h->fanout_table == NULL) {
161 err = got_error_from_errno("malloc");
164 n = read(p->fd, h->fanout_table, len_fanout);
166 err = got_error_from_errno("read");
168 } else if (n != len_fanout) {
169 err = got_error(GOT_ERR_BAD_PACKIDX);
173 err = verify_fanout_table(h->fanout_table);
177 SHA1Update(&ctx, (uint8_t *)h->fanout_table, len_fanout);
178 offset += len_fanout;
179 remain -= len_fanout;
181 nobj = be32toh(h->fanout_table[0xff]);
182 len_ids = nobj * sizeof(*h->sorted_ids);
183 if (len_ids <= nobj || len_ids > remain) {
184 err = got_error(GOT_ERR_BAD_PACKIDX);
189 (struct got_packidx_object_id *)((uint8_t*)(p->map + offset));
191 h->sorted_ids = malloc(len_ids);
192 if (h->sorted_ids == NULL) {
193 err = got_error(GOT_ERR_BAD_PACKIDX);
196 n = read(p->fd, h->sorted_ids, len_ids);
198 err = got_error_from_errno("read");
199 else if (n != len_ids) {
200 err = got_error(GOT_ERR_BAD_PACKIDX);
205 SHA1Update(&ctx, (uint8_t *)h->sorted_ids, len_ids);
209 if (remain < nobj * sizeof(*h->crc32)) {
210 err = got_error(GOT_ERR_BAD_PACKIDX);
214 h->crc32 = (uint32_t *)((uint8_t*)(p->map + offset));
216 h->crc32 = malloc(nobj * sizeof(*h->crc32));
217 if (h->crc32 == NULL) {
218 err = got_error_from_errno("malloc");
221 n = read(p->fd, h->crc32, nobj * sizeof(*h->crc32));
223 err = got_error_from_errno("read");
224 else if (n != nobj * sizeof(*h->crc32)) {
225 err = got_error(GOT_ERR_BAD_PACKIDX);
230 SHA1Update(&ctx, (uint8_t *)h->crc32, nobj * sizeof(*h->crc32));
231 remain -= nobj * sizeof(*h->crc32);
232 offset += nobj * sizeof(*h->crc32);
234 if (remain < nobj * sizeof(*h->offsets)) {
235 err = got_error(GOT_ERR_BAD_PACKIDX);
239 h->offsets = (uint32_t *)((uint8_t*)(p->map + offset));
241 h->offsets = malloc(nobj * sizeof(*h->offsets));
242 if (h->offsets == NULL) {
243 err = got_error_from_errno("malloc");
246 n = read(p->fd, h->offsets, nobj * sizeof(*h->offsets));
248 err = got_error_from_errno("read");
249 else if (n != nobj * sizeof(*h->offsets)) {
250 err = got_error(GOT_ERR_BAD_PACKIDX);
255 SHA1Update(&ctx, (uint8_t *)h->offsets,
256 nobj * sizeof(*h->offsets));
257 remain -= nobj * sizeof(*h->offsets);
258 offset += nobj * sizeof(*h->offsets);
260 /* Large file offsets are contained only in files > 2GB. */
261 for (i = 0; i < nobj; i++) {
262 uint32_t o = be32toh(h->offsets[i]);
263 if (o & GOT_PACKIDX_OFFSET_VAL_IS_LARGE_IDX)
266 if (p->nlargeobj == 0)
269 if (remain < p->nlargeobj * sizeof(*h->large_offsets)) {
270 err = got_error(GOT_ERR_BAD_PACKIDX);
274 h->large_offsets = (uint64_t *)((uint8_t*)(p->map + offset));
276 h->large_offsets = malloc(p->nlargeobj *
277 sizeof(*h->large_offsets));
278 if (h->large_offsets == NULL) {
279 err = got_error_from_errno("malloc");
282 n = read(p->fd, h->large_offsets,
283 p->nlargeobj * sizeof(*h->large_offsets));
285 err = got_error_from_errno("read");
286 else if (n != p->nlargeobj * sizeof(*h->large_offsets)) {
287 err = got_error(GOT_ERR_BAD_PACKIDX);
292 SHA1Update(&ctx, (uint8_t*)h->large_offsets,
293 p->nlargeobj * sizeof(*h->large_offsets));
294 remain -= p->nlargeobj * sizeof(*h->large_offsets);
295 offset += p->nlargeobj * sizeof(*h->large_offsets);
298 if (remain < sizeof(*h->trailer)) {
299 err = got_error(GOT_ERR_BAD_PACKIDX);
304 (struct got_packidx_trailer *)((uint8_t*)(p->map + offset));
306 h->trailer = malloc(sizeof(*h->trailer));
307 if (h->trailer == NULL) {
308 err = got_error_from_errno("malloc");
311 n = read(p->fd, h->trailer, sizeof(*h->trailer));
313 err = got_error_from_errno("read");
314 else if (n != sizeof(*h->trailer)) {
315 err = got_error(GOT_ERR_BAD_PACKIDX);
320 SHA1Update(&ctx, h->trailer->packfile_sha1, SHA1_DIGEST_LENGTH);
321 SHA1Final(sha1, &ctx);
322 if (memcmp(h->trailer->packidx_sha1, sha1,
323 SHA1_DIGEST_LENGTH) != 0)
324 err = got_error(GOT_ERR_PACKIDX_CSUM);
330 const struct got_error *
331 got_packidx_open(struct got_packidx **packidx, const char *path, int verify)
333 const struct got_error *err = NULL;
334 struct got_packidx *p;
339 p = calloc(1, sizeof(*p));
341 return got_error_from_errno("calloc");
343 p->fd = open(path, O_RDONLY | O_NOFOLLOW);
345 err = got_error_from_errno2("open", path);
350 if (fstat(p->fd, &sb) != 0) {
351 err = got_error_from_errno2("fstat", path);
357 if (p->len < sizeof(p->hdr)) {
358 err = got_error(GOT_ERR_BAD_PACKIDX);
364 p->path_packidx = strdup(path);
365 if (p->path_packidx == NULL) {
366 err = got_error_from_errno("strdup");
370 #ifndef GOT_PACK_NO_MMAP
371 p->map = mmap(NULL, p->len, PROT_READ, MAP_PRIVATE, p->fd, 0);
372 if (p->map == MAP_FAILED) {
373 if (errno != ENOMEM) {
374 err = got_error_from_errno("mmap");
377 p->map = NULL; /* fall back to read(2) */
381 err = got_packidx_init_hdr(p, verify);
384 got_packidx_close(p);
391 const struct got_error *
392 got_packidx_close(struct got_packidx *packidx)
394 const struct got_error *err = NULL;
396 free(packidx->path_packidx);
398 if (munmap(packidx->map, packidx->len) == -1)
399 err = got_error_from_errno("munmap");
401 free(packidx->hdr.magic);
402 free(packidx->hdr.version);
403 free(packidx->hdr.fanout_table);
404 free(packidx->hdr.sorted_ids);
405 free(packidx->hdr.crc32);
406 free(packidx->hdr.offsets);
407 free(packidx->hdr.large_offsets);
408 free(packidx->hdr.trailer);
410 if (close(packidx->fd) != 0 && err == NULL)
411 err = got_error_from_errno("close");
418 get_object_offset(struct got_packidx *packidx, int idx)
420 uint32_t offset = be32toh(packidx->hdr.offsets[idx]);
421 if (offset & GOT_PACKIDX_OFFSET_VAL_IS_LARGE_IDX) {
423 idx = offset & GOT_PACKIDX_OFFSET_VAL_MASK;
424 if (idx < 0 || idx >= packidx->nlargeobj ||
425 packidx->hdr.large_offsets == NULL)
427 loffset = be64toh(packidx->hdr.large_offsets[idx]);
428 return (loffset > INT64_MAX ? -1 : (off_t)loffset);
430 return (off_t)(offset & GOT_PACKIDX_OFFSET_VAL_MASK);
434 got_packidx_get_object_idx(struct got_packidx *packidx, struct got_object_id *id)
436 u_int8_t id0 = id->sha1[0];
437 uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
438 int left = 0, right = totobj - 1;
441 left = be32toh(packidx->hdr.fanout_table[id0 - 1]);
443 while (left <= right) {
444 struct got_packidx_object_id *oid;
447 i = ((left + right) / 2);
448 oid = &packidx->hdr.sorted_ids[i];
449 cmp = memcmp(id->sha1, oid->sha1, SHA1_DIGEST_LENGTH);
461 const struct got_error *
462 got_packidx_match_id_str_prefix(struct got_object_id_queue *matched_ids,
463 struct got_packidx *packidx, const char *id_str_prefix)
465 const struct got_error *err = NULL;
467 uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
469 size_t prefix_len = strlen(id_str_prefix);
470 struct got_packidx_object_id *oid;
473 SIMPLEQ_INIT(matched_ids);
476 return got_error_path(id_str_prefix, GOT_ERR_BAD_OBJ_ID_STR);
478 hex[0] = id_str_prefix[0];
479 hex[1] = id_str_prefix[1];
481 if (!got_parse_xdigit(&id0, hex))
482 return got_error_path(id_str_prefix, GOT_ERR_BAD_OBJ_ID_STR);
484 i = be32toh(packidx->hdr.fanout_table[id0 - 1]);
485 oid = &packidx->hdr.sorted_ids[i];
486 while (i < totobj && oid->sha1[0] == id0) {
487 char id_str[SHA1_DIGEST_STRING_LENGTH];
488 struct got_object_qid *qid;
491 if (!got_sha1_digest_to_str(oid->sha1, id_str, sizeof(id_str)))
492 return got_error(GOT_ERR_NO_SPACE);
494 cmp = strncmp(id_str, id_str_prefix, prefix_len);
496 oid = &packidx->hdr.sorted_ids[++i];
501 err = got_object_qid_alloc_partial(&qid);
504 memcpy(qid->id->sha1, oid->sha1, SHA1_DIGEST_LENGTH);
505 SIMPLEQ_INSERT_TAIL(matched_ids, qid, entry);
507 oid = &packidx->hdr.sorted_ids[++i];
511 got_object_id_queue_free(matched_ids);
515 const struct got_error *
516 got_pack_stop_privsep_child(struct got_pack *pack)
518 const struct got_error *err = NULL;
520 if (pack->privsep_child == NULL)
523 err = got_privsep_send_stop(pack->privsep_child->imsg_fd);
526 err = got_privsep_wait_for_child(pack->privsep_child->pid);
527 if (close(pack->privsep_child->imsg_fd) != 0 && err == NULL)
528 err = got_error_from_errno("close");
529 free(pack->privsep_child);
530 pack->privsep_child = NULL;
534 const struct got_error *
535 got_pack_close(struct got_pack *pack)
537 const struct got_error *err = NULL;
539 err = got_pack_stop_privsep_child(pack);
540 if (pack->map && munmap(pack->map, pack->filesize) == -1 && !err)
541 err = got_error_from_errno("munmap");
542 if (pack->fd != -1 && close(pack->fd) != 0 && err == NULL)
543 err = got_error_from_errno("close");
545 free(pack->path_packfile);
546 pack->path_packfile = NULL;
548 if (pack->delta_cache) {
549 got_delta_cache_free(pack->delta_cache);
550 pack->delta_cache = NULL;
556 const struct got_error *
557 got_pack_parse_object_type_and_size(uint8_t *type, uint64_t *size, size_t *len,
558 struct got_pack *pack, off_t offset)
568 if (offset >= pack->filesize)
569 return got_error(GOT_ERR_PACK_OFFSET);
572 mapoff = (size_t)offset;
574 if (lseek(pack->fd, offset, SEEK_SET) == -1)
575 return got_error_from_errno("lseek");
579 /* We do not support size values which don't fit in 64 bit. */
581 return got_error(GOT_ERR_NO_SPACE);
584 sizeN = *(pack->map + mapoff);
585 mapoff += sizeof(sizeN);
587 ssize_t n = read(pack->fd, &sizeN, sizeof(sizeN));
589 return got_error_from_errno("read");
590 if (n != sizeof(sizeN))
591 return got_error(GOT_ERR_BAD_PACKFILE);
593 *len += sizeof(sizeN);
596 t = (sizeN & GOT_PACK_OBJ_SIZE0_TYPE_MASK) >>
597 GOT_PACK_OBJ_SIZE0_TYPE_MASK_SHIFT;
598 s = (sizeN & GOT_PACK_OBJ_SIZE0_VAL_MASK);
600 size_t shift = 4 + 7 * (i - 1);
601 s |= ((sizeN & GOT_PACK_OBJ_SIZE_VAL_MASK) << shift);
604 } while (sizeN & GOT_PACK_OBJ_SIZE_MORE);
611 static const struct got_error *
612 open_plain_object(struct got_object **obj, struct got_object_id *id,
613 uint8_t type, off_t offset, size_t size, int idx)
615 *obj = calloc(1, sizeof(**obj));
617 return got_error_from_errno("calloc");
620 (*obj)->flags = GOT_OBJ_FLAG_PACKED;
621 (*obj)->pack_idx = idx;
624 memcpy(&(*obj)->id, id, sizeof((*obj)->id));
625 (*obj)->pack_offset = offset;
630 static const struct got_error *
631 parse_negative_offset(int64_t *offset, size_t *len, struct got_pack *pack,
642 /* We do not support offset values which don't fit in 64 bit. */
644 return got_error(GOT_ERR_NO_SPACE);
648 if (delta_offset >= pack->filesize)
649 return got_error(GOT_ERR_PACK_OFFSET);
650 mapoff = (size_t)delta_offset + *len;
651 offN = *(pack->map + mapoff);
654 n = read(pack->fd, &offN, sizeof(offN));
656 return got_error_from_errno("read");
657 if (n != sizeof(offN))
658 return got_error(GOT_ERR_BAD_PACKFILE);
660 *len += sizeof(offN);
663 o = (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
667 o += (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
670 } while (offN & GOT_PACK_OBJ_DELTA_OFF_MORE);
676 const struct got_error *
677 got_pack_parse_offset_delta(off_t *base_offset, size_t *len, struct got_pack *pack,
678 off_t offset, int tslen)
680 const struct got_error *err;
686 err = parse_negative_offset(&negoffset, &negofflen, pack,
691 /* Compute the base object's offset (must be in the same pack file). */
692 *base_offset = (offset - negoffset);
693 if (*base_offset <= 0)
694 return got_error(GOT_ERR_BAD_PACKFILE);
700 static const struct got_error *
701 read_delta_data(uint8_t **delta_buf, size_t *delta_len,
702 size_t delta_data_offset, struct got_pack *pack)
704 const struct got_error *err = NULL;
707 if (delta_data_offset >= pack->filesize)
708 return got_error(GOT_ERR_PACK_OFFSET);
709 err = got_inflate_to_mem_mmap(delta_buf, delta_len,
710 NULL, NULL, pack->map, delta_data_offset,
711 pack->filesize - delta_data_offset);
713 if (lseek(pack->fd, delta_data_offset, SEEK_SET) == -1)
714 return got_error_from_errno("lseek");
715 err = got_inflate_to_mem_fd(delta_buf, delta_len, NULL,
721 static const struct got_error *
722 add_delta(struct got_delta_chain *deltas, off_t delta_offset, size_t tslen,
723 int delta_type, size_t delta_size, size_t delta_data_offset)
725 struct got_delta *delta;
727 delta = got_delta_open(delta_offset, tslen, delta_type, delta_size,
730 return got_error_from_errno("got_delta_open");
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_packidx *packidx, struct got_pack *pack, off_t delta_offset,
740 size_t tslen, int delta_type, size_t delta_size, unsigned int recursion)
743 const struct got_error *err;
748 off_t delta_data_offset;
751 err = got_pack_parse_offset_delta(&base_offset, &consumed, pack,
752 delta_offset, tslen);
756 delta_data_offset = delta_offset + tslen + consumed;
757 if (delta_data_offset >= pack->filesize)
758 return got_error(GOT_ERR_PACK_OFFSET);
760 if (pack->map == NULL) {
761 delta_data_offset = lseek(pack->fd, 0, SEEK_CUR);
762 if (delta_data_offset == -1)
763 return got_error_from_errno("lseek");
766 err = add_delta(deltas, delta_offset, tslen, delta_type, delta_size,
771 /* An offset delta must be in the same packfile. */
772 if (base_offset >= pack->filesize)
773 return got_error(GOT_ERR_PACK_OFFSET);
775 err = got_pack_parse_object_type_and_size(&base_type, &base_size,
776 &base_tslen, pack, base_offset);
780 return got_pack_resolve_delta_chain(deltas, packidx, pack, base_offset,
781 base_tslen, base_type, base_size, recursion - 1);
784 static const struct got_error *
785 resolve_ref_delta(struct got_delta_chain *deltas, struct got_packidx *packidx,
786 struct got_pack *pack, off_t delta_offset, size_t tslen, int delta_type,
787 size_t delta_size, unsigned int recursion)
789 const struct got_error *err;
790 struct got_object_id id;
796 off_t delta_data_offset;
798 if (delta_offset + tslen >= pack->filesize)
799 return got_error(GOT_ERR_PACK_OFFSET);
802 size_t mapoff = delta_offset + tslen;
803 memcpy(&id, pack->map + mapoff, sizeof(id));
804 mapoff += sizeof(id);
805 delta_data_offset = (off_t)mapoff;
808 n = read(pack->fd, &id, sizeof(id));
810 return got_error_from_errno("read");
812 return got_error(GOT_ERR_BAD_PACKFILE);
813 delta_data_offset = lseek(pack->fd, 0, SEEK_CUR);
814 if (delta_data_offset == -1)
815 return got_error_from_errno("lseek");
818 err = add_delta(deltas, delta_offset, tslen, delta_type, delta_size,
823 /* Delta base must be in the same pack file. */
824 idx = got_packidx_get_object_idx(packidx, &id);
826 return got_error(GOT_ERR_NO_OBJ);
828 base_offset = get_object_offset(packidx, idx);
829 if (base_offset == (uint64_t)-1)
830 return got_error(GOT_ERR_BAD_PACKIDX);
832 if (base_offset >= pack->filesize)
833 return got_error(GOT_ERR_PACK_OFFSET);
835 err = got_pack_parse_object_type_and_size(&base_type, &base_size,
836 &base_tslen, pack, base_offset);
840 return got_pack_resolve_delta_chain(deltas, packidx, pack, base_offset,
841 base_tslen, base_type, base_size, recursion - 1);
844 const struct got_error *
845 got_pack_resolve_delta_chain(struct got_delta_chain *deltas,
846 struct got_packidx *packidx, struct got_pack *pack, off_t delta_offset,
847 size_t tslen, int delta_type, size_t delta_size, unsigned int recursion)
849 const struct got_error *err = NULL;
851 if (--recursion == 0)
852 return got_error(GOT_ERR_RECURSION);
854 switch (delta_type) {
855 case GOT_OBJ_TYPE_COMMIT:
856 case GOT_OBJ_TYPE_TREE:
857 case GOT_OBJ_TYPE_BLOB:
858 case GOT_OBJ_TYPE_TAG:
859 /* Plain types are the final delta base. Recursion ends. */
860 err = add_delta(deltas, delta_offset, tslen, delta_type,
863 case GOT_OBJ_TYPE_OFFSET_DELTA:
864 err = resolve_offset_delta(deltas, packidx, pack,
865 delta_offset, tslen, delta_type, delta_size, recursion - 1);
867 case GOT_OBJ_TYPE_REF_DELTA:
868 err = resolve_ref_delta(deltas, packidx, pack,
869 delta_offset, tslen, delta_type, delta_size, recursion - 1);
872 return got_error(GOT_ERR_OBJ_TYPE);
878 static const struct got_error *
879 open_delta_object(struct got_object **obj, struct got_packidx *packidx,
880 struct got_pack *pack, struct got_object_id *id, off_t offset,
881 size_t tslen, int delta_type, size_t delta_size, int idx)
883 const struct got_error *err = NULL;
886 *obj = calloc(1, sizeof(**obj));
888 return got_error_from_errno("calloc");
892 (*obj)->size = 0; /* Not known because deltas aren't applied yet. */
893 memcpy(&(*obj)->id, id, sizeof((*obj)->id));
894 (*obj)->pack_offset = offset + tslen;
896 SIMPLEQ_INIT(&(*obj)->deltas.entries);
897 (*obj)->flags |= GOT_OBJ_FLAG_DELTIFIED;
898 (*obj)->flags |= GOT_OBJ_FLAG_PACKED;
899 (*obj)->pack_idx = idx;
901 err = got_pack_resolve_delta_chain(&(*obj)->deltas, packidx, pack,
902 offset, tslen, delta_type, delta_size,
903 GOT_DELTA_CHAIN_RECURSION_MAX);
907 err = got_delta_chain_get_base_type(&resolved_type, &(*obj)->deltas);
910 (*obj)->type = resolved_type;
913 got_object_close(*obj);
919 const struct got_error *
920 got_packfile_open_object(struct got_object **obj, struct got_pack *pack,
921 struct got_packidx *packidx, int idx, struct got_object_id *id)
923 const struct got_error *err = NULL;
931 offset = get_object_offset(packidx, idx);
932 if (offset == (uint64_t)-1)
933 return got_error(GOT_ERR_BAD_PACKIDX);
935 err = got_pack_parse_object_type_and_size(&type, &size, &tslen,
941 case GOT_OBJ_TYPE_COMMIT:
942 case GOT_OBJ_TYPE_TREE:
943 case GOT_OBJ_TYPE_BLOB:
944 case GOT_OBJ_TYPE_TAG:
945 err = open_plain_object(obj, id, type, offset + tslen,
948 case GOT_OBJ_TYPE_OFFSET_DELTA:
949 case GOT_OBJ_TYPE_REF_DELTA:
950 err = open_delta_object(obj, packidx, pack, id, offset,
951 tslen, type, size, idx);
954 err = got_error(GOT_ERR_OBJ_TYPE);
961 const struct got_error *
962 got_pack_get_delta_chain_max_size(uint64_t *max_size, struct got_delta_chain *deltas,
963 struct got_pack *pack)
965 struct got_delta *delta;
966 uint64_t base_size = 0, result_size = 0;
969 SIMPLEQ_FOREACH(delta, &deltas->entries, entry) {
970 /* Plain object types are the delta base. */
971 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
972 delta->type != GOT_OBJ_TYPE_TREE &&
973 delta->type != GOT_OBJ_TYPE_BLOB &&
974 delta->type != GOT_OBJ_TYPE_TAG) {
975 const struct got_error *err;
980 got_delta_cache_get(&delta_buf, &delta_len,
981 pack->delta_cache, delta->data_offset);
982 if (delta_buf == NULL) {
984 err = read_delta_data(&delta_buf, &delta_len,
985 delta->data_offset, pack);
988 err = got_delta_cache_add(pack->delta_cache,
989 delta->data_offset, delta_buf, delta_len);
992 else if (err->code != GOT_ERR_NO_SPACE) {
997 err = got_delta_get_sizes(&base_size, &result_size,
998 delta_buf, delta_len);
1004 base_size = delta->size;
1005 if (base_size > *max_size)
1006 *max_size = base_size;
1007 if (result_size > *max_size)
1008 *max_size = result_size;
1014 const struct got_error *
1015 got_pack_get_max_delta_object_size(uint64_t *size, struct got_object *obj,
1016 struct got_pack *pack)
1018 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0)
1019 return got_error(GOT_ERR_OBJ_TYPE);
1021 return got_pack_get_delta_chain_max_size(size, &obj->deltas, pack);
1024 const struct got_error *
1025 got_pack_dump_delta_chain_to_file(size_t *result_size,
1026 struct got_delta_chain *deltas, struct got_pack *pack, FILE *outfile,
1027 FILE *base_file, FILE *accum_file)
1029 const struct got_error *err = NULL;
1030 struct got_delta *delta;
1031 uint8_t *base_buf = NULL, *accum_buf = NULL, *delta_buf;
1032 size_t base_bufsz = 0, accum_size = 0, delta_len;
1038 if (SIMPLEQ_EMPTY(&deltas->entries))
1039 return got_error(GOT_ERR_BAD_DELTA_CHAIN);
1041 /* We process small enough files entirely in memory for speed. */
1042 err = got_pack_get_delta_chain_max_size(&max_size, deltas, pack);
1045 if (max_size < GOT_DELTA_RESULT_SIZE_CACHED_MAX) {
1046 accum_buf = malloc(max_size);
1047 if (accum_buf == NULL)
1048 return got_error_from_errno("malloc");
1053 /* Deltas are ordered in ascending order. */
1054 SIMPLEQ_FOREACH(delta, &deltas->entries, entry) {
1058 off_t delta_data_offset;
1060 /* Plain object types are the delta base. */
1061 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1062 delta->type != GOT_OBJ_TYPE_TREE &&
1063 delta->type != GOT_OBJ_TYPE_BLOB &&
1064 delta->type != GOT_OBJ_TYPE_TAG) {
1065 err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1069 delta_data_offset = delta->offset + delta->tslen;
1070 if (delta_data_offset >= pack->filesize) {
1071 err = got_error(GOT_ERR_PACK_OFFSET);
1074 if (pack->map == NULL) {
1075 if (lseek(pack->fd, delta_data_offset, SEEK_SET)
1077 err = got_error_from_errno("lseek");
1083 mapoff = (size_t)delta_data_offset;
1084 err = got_inflate_to_file_mmap(
1085 &base_bufsz, NULL, NULL, pack->map,
1086 mapoff, pack->filesize - mapoff,
1089 err = got_inflate_to_file_fd(
1090 &base_bufsz, NULL, NULL, pack->fd,
1094 mapoff = (size_t)delta_data_offset;
1095 err = got_inflate_to_mem_mmap(&base_buf,
1096 &base_bufsz, NULL, NULL,
1098 pack->filesize - mapoff);
1100 err = got_inflate_to_mem_fd(&base_buf,
1101 &base_bufsz, NULL, NULL, max_size,
1112 got_delta_cache_get(&delta_buf, &delta_len,
1113 pack->delta_cache, delta->data_offset);
1114 if (delta_buf == NULL) {
1116 err = read_delta_data(&delta_buf, &delta_len,
1117 delta->data_offset, pack);
1120 err = got_delta_cache_add(pack->delta_cache,
1121 delta->data_offset, delta_buf, delta_len);
1124 else if (err->code != GOT_ERR_NO_SPACE) {
1130 err = got_delta_apply_in_mem(base_buf, base_bufsz,
1131 delta_buf, delta_len, accum_buf,
1132 &accum_size, max_size);
1135 err = got_delta_apply(base_file, delta_buf,
1137 /* Final delta application writes to output file. */
1138 ++n < deltas->nentries ? accum_file : outfile,
1146 if (n < deltas->nentries) {
1147 /* Accumulated delta becomes the new base. */
1149 uint8_t *tmp = accum_buf;
1151 * Base buffer switches roles with accumulation
1152 * buffer. Ensure it can hold the largest
1153 * result in the delta chain. The initial
1154 * allocation might have been smaller.
1156 if (base_bufsz < max_size) {
1158 p = reallocarray(base_buf, 1, max_size);
1160 err = got_error_from_errno(
1165 base_bufsz = max_size;
1167 accum_buf = base_buf;
1170 FILE *tmp = accum_file;
1171 accum_file = base_file;
1182 size_t len = fwrite(accum_buf, 1, accum_size, outfile);
1184 if (len != accum_size)
1185 err = got_ferror(outfile, GOT_ERR_IO);
1189 *result_size = accum_size;
1193 const struct got_error *
1194 got_pack_dump_delta_chain_to_mem(uint8_t **outbuf, size_t *outlen,
1195 struct got_delta_chain *deltas, struct got_pack *pack)
1197 const struct got_error *err = NULL;
1198 struct got_delta *delta;
1199 uint8_t *base_buf = NULL, *accum_buf = NULL, *delta_buf;
1200 size_t base_bufsz = 0, accum_size = 0, delta_len;
1207 if (SIMPLEQ_EMPTY(&deltas->entries))
1208 return got_error(GOT_ERR_BAD_DELTA_CHAIN);
1210 err = got_pack_get_delta_chain_max_size(&max_size, deltas, pack);
1213 accum_buf = malloc(max_size);
1214 if (accum_buf == NULL)
1215 return got_error_from_errno("malloc");
1217 /* Deltas are ordered in ascending order. */
1218 SIMPLEQ_FOREACH(delta, &deltas->entries, entry) {
1221 size_t delta_data_offset;
1223 /* Plain object types are the delta base. */
1224 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1225 delta->type != GOT_OBJ_TYPE_TREE &&
1226 delta->type != GOT_OBJ_TYPE_BLOB &&
1227 delta->type != GOT_OBJ_TYPE_TAG) {
1228 err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1232 delta_data_offset = delta->offset + delta->tslen;
1233 if (delta_data_offset >= pack->filesize) {
1234 err = got_error(GOT_ERR_PACK_OFFSET);
1238 size_t mapoff = (size_t)delta_data_offset;
1239 err = got_inflate_to_mem_mmap(&base_buf,
1240 &base_bufsz, NULL, NULL, pack->map,
1241 mapoff, pack->filesize - mapoff);
1243 if (lseek(pack->fd, delta_data_offset, SEEK_SET)
1245 err = got_error_from_errno("lseek");
1248 err = got_inflate_to_mem_fd(&base_buf,
1249 &base_bufsz, NULL, NULL, max_size,
1258 got_delta_cache_get(&delta_buf, &delta_len,
1259 pack->delta_cache, delta->data_offset);
1260 if (delta_buf == NULL) {
1262 err = read_delta_data(&delta_buf, &delta_len,
1263 delta->data_offset, pack);
1266 err = got_delta_cache_add(pack->delta_cache,
1267 delta->data_offset, delta_buf, delta_len);
1270 else if (err->code != GOT_ERR_NO_SPACE) {
1275 err = got_delta_apply_in_mem(base_buf, base_bufsz,
1276 delta_buf, delta_len, accum_buf,
1277 &accum_size, max_size);
1284 if (n < deltas->nentries) {
1285 /* Accumulated delta becomes the new base. */
1286 uint8_t *tmp = accum_buf;
1288 * Base buffer switches roles with accumulation buffer.
1289 * Ensure it can hold the largest result in the delta
1290 * chain. Initial allocation might have been smaller.
1292 if (base_bufsz < max_size) {
1294 p = reallocarray(base_buf, 1, max_size);
1296 err = got_error_from_errno(
1301 base_bufsz = max_size;
1303 accum_buf = base_buf;
1315 *outbuf = accum_buf;
1316 *outlen = accum_size;
1321 const struct got_error *
1322 got_packfile_extract_object(struct got_pack *pack, struct got_object *obj,
1323 FILE *outfile, FILE *base_file, FILE *accum_file)
1325 const struct got_error *err = NULL;
1327 if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
1328 return got_error(GOT_ERR_OBJ_NOT_PACKED);
1330 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0) {
1331 if (obj->pack_offset >= pack->filesize)
1332 return got_error(GOT_ERR_PACK_OFFSET);
1335 size_t mapoff = (size_t)obj->pack_offset;
1336 err = got_inflate_to_file_mmap(&obj->size, NULL, NULL,
1337 pack->map, mapoff, pack->filesize - mapoff,
1340 if (lseek(pack->fd, obj->pack_offset, SEEK_SET) == -1)
1341 return got_error_from_errno("lseek");
1342 err = got_inflate_to_file_fd(&obj->size, NULL, NULL,
1346 err = got_pack_dump_delta_chain_to_file(&obj->size,
1347 &obj->deltas, pack, outfile, base_file, accum_file);
1352 const struct got_error *
1353 got_packfile_extract_object_to_mem(uint8_t **buf, size_t *len,
1354 struct got_object *obj, struct got_pack *pack)
1356 const struct got_error *err = NULL;
1358 if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
1359 return got_error(GOT_ERR_OBJ_NOT_PACKED);
1361 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0) {
1362 if (obj->pack_offset >= pack->filesize)
1363 return got_error(GOT_ERR_PACK_OFFSET);
1365 size_t mapoff = (size_t)obj->pack_offset;
1366 err = got_inflate_to_mem_mmap(buf, len, NULL, NULL,
1367 pack->map, mapoff, pack->filesize - mapoff);
1369 if (lseek(pack->fd, obj->pack_offset, SEEK_SET) == -1)
1370 return got_error_from_errno("lseek");
1371 err = got_inflate_to_mem_fd(buf, len, NULL, NULL,
1372 obj->size, pack->fd);
1375 err = got_pack_dump_delta_chain_to_mem(buf, len, &obj->deltas,