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 (*h->magic != htobe32(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 (*h->version != htobe32(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 = h->offsets[i];
263 if (o & htobe32(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,
332 int dir_fd, const char *relpath, int verify)
334 const struct got_error *err = NULL;
335 struct got_packidx *p;
340 p = calloc(1, sizeof(*p));
342 return got_error_from_errno("calloc");
344 p->fd = openat(dir_fd, relpath, O_RDONLY | O_NOFOLLOW);
346 err = got_error_from_errno2("openat", relpath);
351 if (fstat(p->fd, &sb) != 0) {
352 err = got_error_from_errno2("fstat", relpath);
358 if (p->len < sizeof(p->hdr)) {
359 err = got_error(GOT_ERR_BAD_PACKIDX);
365 p->path_packidx = strdup(relpath);
366 if (p->path_packidx == NULL) {
367 err = got_error_from_errno("strdup");
371 #ifndef GOT_PACK_NO_MMAP
372 p->map = mmap(NULL, p->len, PROT_READ, MAP_PRIVATE, p->fd, 0);
373 if (p->map == MAP_FAILED) {
374 if (errno != ENOMEM) {
375 err = got_error_from_errno("mmap");
378 p->map = NULL; /* fall back to read(2) */
382 err = got_packidx_init_hdr(p, verify);
385 got_packidx_close(p);
392 const struct got_error *
393 got_packidx_close(struct got_packidx *packidx)
395 const struct got_error *err = NULL;
397 free(packidx->path_packidx);
399 if (munmap(packidx->map, packidx->len) == -1)
400 err = got_error_from_errno("munmap");
402 free(packidx->hdr.magic);
403 free(packidx->hdr.version);
404 free(packidx->hdr.fanout_table);
405 free(packidx->hdr.sorted_ids);
406 free(packidx->hdr.crc32);
407 free(packidx->hdr.offsets);
408 free(packidx->hdr.large_offsets);
409 free(packidx->hdr.trailer);
411 if (close(packidx->fd) == -1 && err == NULL)
412 err = got_error_from_errno("close");
418 const struct got_error *
419 got_packidx_get_packfile_path(char **path_packfile, struct got_packidx *packidx)
423 /* Packfile path contains ".pack" instead of ".idx", so add one byte. */
424 size = strlen(packidx->path_packidx) + 2;
425 if (size < GOT_PACKFILE_NAMELEN + 1)
426 return got_error_path(packidx->path_packidx, GOT_ERR_BAD_PATH);
428 *path_packfile = malloc(size);
429 if (*path_packfile == NULL)
430 return got_error_from_errno("malloc");
432 /* Copy up to and excluding ".idx". */
433 if (strlcpy(*path_packfile, packidx->path_packidx,
434 size - strlen(GOT_PACKIDX_SUFFIX) - 1) >= size)
435 return got_error(GOT_ERR_NO_SPACE);
437 if (strlcat(*path_packfile, GOT_PACKFILE_SUFFIX, size) >= size)
438 return got_error(GOT_ERR_NO_SPACE);
444 get_object_offset(struct got_packidx *packidx, int idx)
446 uint32_t offset = be32toh(packidx->hdr.offsets[idx]);
447 if (offset & GOT_PACKIDX_OFFSET_VAL_IS_LARGE_IDX) {
449 idx = offset & GOT_PACKIDX_OFFSET_VAL_MASK;
450 if (idx < 0 || idx >= packidx->nlargeobj ||
451 packidx->hdr.large_offsets == NULL)
453 loffset = be64toh(packidx->hdr.large_offsets[idx]);
454 return (loffset > INT64_MAX ? -1 : (off_t)loffset);
456 return (off_t)(offset & GOT_PACKIDX_OFFSET_VAL_MASK);
460 got_packidx_get_object_idx(struct got_packidx *packidx, struct got_object_id *id)
462 u_int8_t id0 = id->sha1[0];
463 uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
464 int left = 0, right = totobj - 1;
467 left = be32toh(packidx->hdr.fanout_table[id0 - 1]);
469 while (left <= right) {
470 struct got_packidx_object_id *oid;
473 i = ((left + right) / 2);
474 oid = &packidx->hdr.sorted_ids[i];
475 cmp = memcmp(id->sha1, oid->sha1, SHA1_DIGEST_LENGTH);
487 const struct got_error *
488 got_packidx_match_id_str_prefix(struct got_object_id_queue *matched_ids,
489 struct got_packidx *packidx, const char *id_str_prefix)
491 const struct got_error *err = NULL;
493 uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
495 size_t prefix_len = strlen(id_str_prefix);
496 struct got_packidx_object_id *oid;
499 SIMPLEQ_INIT(matched_ids);
502 return got_error_path(id_str_prefix, GOT_ERR_BAD_OBJ_ID_STR);
504 hex[0] = id_str_prefix[0];
505 hex[1] = id_str_prefix[1];
507 if (!got_parse_xdigit(&id0, hex))
508 return got_error_path(id_str_prefix, GOT_ERR_BAD_OBJ_ID_STR);
510 i = be32toh(packidx->hdr.fanout_table[id0 - 1]);
511 oid = &packidx->hdr.sorted_ids[i];
512 while (i < totobj && oid->sha1[0] == id0) {
513 char id_str[SHA1_DIGEST_STRING_LENGTH];
514 struct got_object_qid *qid;
517 if (!got_sha1_digest_to_str(oid->sha1, id_str, sizeof(id_str)))
518 return got_error(GOT_ERR_NO_SPACE);
520 cmp = strncmp(id_str, id_str_prefix, prefix_len);
522 oid = &packidx->hdr.sorted_ids[++i];
527 err = got_object_qid_alloc_partial(&qid);
530 memcpy(qid->id->sha1, oid->sha1, SHA1_DIGEST_LENGTH);
531 SIMPLEQ_INSERT_TAIL(matched_ids, qid, entry);
533 oid = &packidx->hdr.sorted_ids[++i];
537 got_object_id_queue_free(matched_ids);
541 static const struct got_error *
542 pack_stop_privsep_child(struct got_pack *pack)
544 const struct got_error *err = NULL;
546 if (pack->privsep_child == NULL)
549 err = got_privsep_send_stop(pack->privsep_child->imsg_fd);
552 err = got_privsep_wait_for_child(pack->privsep_child->pid);
553 if (close(pack->privsep_child->imsg_fd) == -1 && err == NULL)
554 err = got_error_from_errno("close");
555 imsg_clear(pack->privsep_child->ibuf);
556 free(pack->privsep_child->ibuf);
557 free(pack->privsep_child);
558 pack->privsep_child = NULL;
562 const struct got_error *
563 got_pack_close(struct got_pack *pack)
565 const struct got_error *err = NULL;
567 err = pack_stop_privsep_child(pack);
568 if (pack->map && munmap(pack->map, pack->filesize) == -1 && !err)
569 err = got_error_from_errno("munmap");
570 if (pack->fd != -1 && close(pack->fd) == -1 && err == NULL)
571 err = got_error_from_errno("close");
573 free(pack->path_packfile);
574 pack->path_packfile = NULL;
576 if (pack->delta_cache) {
577 got_delta_cache_free(pack->delta_cache);
578 pack->delta_cache = NULL;
584 const struct got_error *
585 got_pack_parse_object_type_and_size(uint8_t *type, uint64_t *size, size_t *len,
586 struct got_pack *pack, off_t offset)
596 if (offset >= pack->filesize)
597 return got_error(GOT_ERR_PACK_OFFSET);
600 mapoff = (size_t)offset;
602 if (lseek(pack->fd, offset, SEEK_SET) == -1)
603 return got_error_from_errno("lseek");
607 /* We do not support size values which don't fit in 64 bit. */
609 return got_error(GOT_ERR_NO_SPACE);
612 sizeN = *(pack->map + mapoff);
613 mapoff += sizeof(sizeN);
615 ssize_t n = read(pack->fd, &sizeN, sizeof(sizeN));
617 return got_error_from_errno("read");
618 if (n != sizeof(sizeN))
619 return got_error(GOT_ERR_BAD_PACKFILE);
621 *len += sizeof(sizeN);
624 t = (sizeN & GOT_PACK_OBJ_SIZE0_TYPE_MASK) >>
625 GOT_PACK_OBJ_SIZE0_TYPE_MASK_SHIFT;
626 s = (sizeN & GOT_PACK_OBJ_SIZE0_VAL_MASK);
628 size_t shift = 4 + 7 * (i - 1);
629 s |= ((sizeN & GOT_PACK_OBJ_SIZE_VAL_MASK) << shift);
632 } while (sizeN & GOT_PACK_OBJ_SIZE_MORE);
639 static const struct got_error *
640 open_plain_object(struct got_object **obj, struct got_object_id *id,
641 uint8_t type, off_t offset, size_t size, int idx)
643 *obj = calloc(1, sizeof(**obj));
645 return got_error_from_errno("calloc");
648 (*obj)->flags = GOT_OBJ_FLAG_PACKED;
649 (*obj)->pack_idx = idx;
652 memcpy(&(*obj)->id, id, sizeof((*obj)->id));
653 (*obj)->pack_offset = offset;
658 static const struct got_error *
659 parse_negative_offset(int64_t *offset, size_t *len, struct got_pack *pack,
670 /* We do not support offset values which don't fit in 64 bit. */
672 return got_error(GOT_ERR_NO_SPACE);
676 if (delta_offset >= pack->filesize)
677 return got_error(GOT_ERR_PACK_OFFSET);
678 mapoff = (size_t)delta_offset + *len;
679 offN = *(pack->map + mapoff);
682 n = read(pack->fd, &offN, sizeof(offN));
684 return got_error_from_errno("read");
685 if (n != sizeof(offN))
686 return got_error(GOT_ERR_BAD_PACKFILE);
688 *len += sizeof(offN);
691 o = (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
695 o += (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
698 } while (offN & GOT_PACK_OBJ_DELTA_OFF_MORE);
704 const struct got_error *
705 got_pack_parse_offset_delta(off_t *base_offset, size_t *len, struct got_pack *pack,
706 off_t offset, int tslen)
708 const struct got_error *err;
714 err = parse_negative_offset(&negoffset, &negofflen, pack,
719 /* Compute the base object's offset (must be in the same pack file). */
720 *base_offset = (offset - negoffset);
721 if (*base_offset <= 0)
722 return got_error(GOT_ERR_BAD_PACKFILE);
728 static const struct got_error *
729 read_delta_data(uint8_t **delta_buf, size_t *delta_len,
730 size_t delta_data_offset, struct got_pack *pack)
732 const struct got_error *err = NULL;
735 if (delta_data_offset >= pack->filesize)
736 return got_error(GOT_ERR_PACK_OFFSET);
737 err = got_inflate_to_mem_mmap(delta_buf, delta_len,
738 NULL, NULL, pack->map, delta_data_offset,
739 pack->filesize - delta_data_offset);
741 if (lseek(pack->fd, delta_data_offset, SEEK_SET) == -1)
742 return got_error_from_errno("lseek");
743 err = got_inflate_to_mem_fd(delta_buf, delta_len, NULL,
749 static const struct got_error *
750 add_delta(struct got_delta_chain *deltas, off_t delta_offset, size_t tslen,
751 int delta_type, size_t delta_size, size_t delta_data_offset)
753 struct got_delta *delta;
755 delta = got_delta_open(delta_offset, tslen, delta_type, delta_size,
758 return got_error_from_errno("got_delta_open");
759 /* delta is freed in got_object_close() */
761 SIMPLEQ_INSERT_HEAD(&deltas->entries, delta, entry);
765 static const struct got_error *
766 resolve_offset_delta(struct got_delta_chain *deltas,
767 struct got_packidx *packidx, struct got_pack *pack, off_t delta_offset,
768 size_t tslen, int delta_type, size_t delta_size, unsigned int recursion)
771 const struct got_error *err;
776 off_t delta_data_offset;
779 err = got_pack_parse_offset_delta(&base_offset, &consumed, pack,
780 delta_offset, tslen);
784 delta_data_offset = delta_offset + tslen + consumed;
785 if (delta_data_offset >= pack->filesize)
786 return got_error(GOT_ERR_PACK_OFFSET);
788 if (pack->map == NULL) {
789 delta_data_offset = lseek(pack->fd, 0, SEEK_CUR);
790 if (delta_data_offset == -1)
791 return got_error_from_errno("lseek");
794 err = add_delta(deltas, delta_offset, tslen, delta_type, delta_size,
799 /* An offset delta must be in the same packfile. */
800 if (base_offset >= pack->filesize)
801 return got_error(GOT_ERR_PACK_OFFSET);
803 err = got_pack_parse_object_type_and_size(&base_type, &base_size,
804 &base_tslen, pack, base_offset);
808 return got_pack_resolve_delta_chain(deltas, packidx, pack, base_offset,
809 base_tslen, base_type, base_size, recursion - 1);
812 static const struct got_error *
813 resolve_ref_delta(struct got_delta_chain *deltas, struct got_packidx *packidx,
814 struct got_pack *pack, off_t delta_offset, size_t tslen, int delta_type,
815 size_t delta_size, unsigned int recursion)
817 const struct got_error *err;
818 struct got_object_id id;
824 off_t delta_data_offset;
826 if (delta_offset + tslen >= pack->filesize)
827 return got_error(GOT_ERR_PACK_OFFSET);
830 size_t mapoff = delta_offset + tslen;
831 memcpy(&id, pack->map + mapoff, sizeof(id));
832 mapoff += sizeof(id);
833 delta_data_offset = (off_t)mapoff;
836 n = read(pack->fd, &id, sizeof(id));
838 return got_error_from_errno("read");
840 return got_error(GOT_ERR_BAD_PACKFILE);
841 delta_data_offset = lseek(pack->fd, 0, SEEK_CUR);
842 if (delta_data_offset == -1)
843 return got_error_from_errno("lseek");
846 err = add_delta(deltas, delta_offset, tslen, delta_type, delta_size,
851 /* Delta base must be in the same pack file. */
852 idx = got_packidx_get_object_idx(packidx, &id);
854 return got_error(GOT_ERR_NO_OBJ);
856 base_offset = get_object_offset(packidx, idx);
857 if (base_offset == (uint64_t)-1)
858 return got_error(GOT_ERR_BAD_PACKIDX);
860 if (base_offset >= pack->filesize)
861 return got_error(GOT_ERR_PACK_OFFSET);
863 err = got_pack_parse_object_type_and_size(&base_type, &base_size,
864 &base_tslen, pack, base_offset);
868 return got_pack_resolve_delta_chain(deltas, packidx, pack, base_offset,
869 base_tslen, base_type, base_size, recursion - 1);
872 const struct got_error *
873 got_pack_resolve_delta_chain(struct got_delta_chain *deltas,
874 struct got_packidx *packidx, struct got_pack *pack, off_t delta_offset,
875 size_t tslen, int delta_type, size_t delta_size, unsigned int recursion)
877 const struct got_error *err = NULL;
879 if (--recursion == 0)
880 return got_error(GOT_ERR_RECURSION);
882 switch (delta_type) {
883 case GOT_OBJ_TYPE_COMMIT:
884 case GOT_OBJ_TYPE_TREE:
885 case GOT_OBJ_TYPE_BLOB:
886 case GOT_OBJ_TYPE_TAG:
887 /* Plain types are the final delta base. Recursion ends. */
888 err = add_delta(deltas, delta_offset, tslen, delta_type,
891 case GOT_OBJ_TYPE_OFFSET_DELTA:
892 err = resolve_offset_delta(deltas, packidx, pack,
893 delta_offset, tslen, delta_type, delta_size, recursion - 1);
895 case GOT_OBJ_TYPE_REF_DELTA:
896 err = resolve_ref_delta(deltas, packidx, pack,
897 delta_offset, tslen, delta_type, delta_size, recursion - 1);
900 return got_error(GOT_ERR_OBJ_TYPE);
906 static const struct got_error *
907 open_delta_object(struct got_object **obj, struct got_packidx *packidx,
908 struct got_pack *pack, struct got_object_id *id, off_t offset,
909 size_t tslen, int delta_type, size_t delta_size, int idx)
911 const struct got_error *err = NULL;
914 *obj = calloc(1, sizeof(**obj));
916 return got_error_from_errno("calloc");
920 (*obj)->size = 0; /* Not known because deltas aren't applied yet. */
921 memcpy(&(*obj)->id, id, sizeof((*obj)->id));
922 (*obj)->pack_offset = offset + tslen;
924 SIMPLEQ_INIT(&(*obj)->deltas.entries);
925 (*obj)->flags |= GOT_OBJ_FLAG_DELTIFIED;
926 (*obj)->flags |= GOT_OBJ_FLAG_PACKED;
927 (*obj)->pack_idx = idx;
929 err = got_pack_resolve_delta_chain(&(*obj)->deltas, packidx, pack,
930 offset, tslen, delta_type, delta_size,
931 GOT_DELTA_CHAIN_RECURSION_MAX);
935 err = got_delta_chain_get_base_type(&resolved_type, &(*obj)->deltas);
938 (*obj)->type = resolved_type;
941 got_object_close(*obj);
947 const struct got_error *
948 got_packfile_open_object(struct got_object **obj, struct got_pack *pack,
949 struct got_packidx *packidx, int idx, struct got_object_id *id)
951 const struct got_error *err = NULL;
959 offset = get_object_offset(packidx, idx);
960 if (offset == (uint64_t)-1)
961 return got_error(GOT_ERR_BAD_PACKIDX);
963 err = got_pack_parse_object_type_and_size(&type, &size, &tslen,
969 case GOT_OBJ_TYPE_COMMIT:
970 case GOT_OBJ_TYPE_TREE:
971 case GOT_OBJ_TYPE_BLOB:
972 case GOT_OBJ_TYPE_TAG:
973 err = open_plain_object(obj, id, type, offset + tslen,
976 case GOT_OBJ_TYPE_OFFSET_DELTA:
977 case GOT_OBJ_TYPE_REF_DELTA:
978 err = open_delta_object(obj, packidx, pack, id, offset,
979 tslen, type, size, idx);
982 err = got_error(GOT_ERR_OBJ_TYPE);
989 const struct got_error *
990 got_pack_get_delta_chain_max_size(uint64_t *max_size, struct got_delta_chain *deltas,
991 struct got_pack *pack)
993 struct got_delta *delta;
994 uint64_t base_size = 0, result_size = 0;
997 SIMPLEQ_FOREACH(delta, &deltas->entries, entry) {
998 /* Plain object types are the delta base. */
999 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1000 delta->type != GOT_OBJ_TYPE_TREE &&
1001 delta->type != GOT_OBJ_TYPE_BLOB &&
1002 delta->type != GOT_OBJ_TYPE_TAG) {
1003 const struct got_error *err;
1008 got_delta_cache_get(&delta_buf, &delta_len,
1009 pack->delta_cache, delta->data_offset);
1010 if (delta_buf == NULL) {
1012 err = read_delta_data(&delta_buf, &delta_len,
1013 delta->data_offset, pack);
1016 err = got_delta_cache_add(pack->delta_cache,
1017 delta->data_offset, delta_buf, delta_len);
1020 else if (err->code != GOT_ERR_NO_SPACE) {
1025 err = got_delta_get_sizes(&base_size, &result_size,
1026 delta_buf, delta_len);
1032 base_size = delta->size;
1033 if (base_size > *max_size)
1034 *max_size = base_size;
1035 if (result_size > *max_size)
1036 *max_size = result_size;
1042 const struct got_error *
1043 got_pack_get_max_delta_object_size(uint64_t *size, struct got_object *obj,
1044 struct got_pack *pack)
1046 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0)
1047 return got_error(GOT_ERR_OBJ_TYPE);
1049 return got_pack_get_delta_chain_max_size(size, &obj->deltas, pack);
1052 const struct got_error *
1053 got_pack_dump_delta_chain_to_file(size_t *result_size,
1054 struct got_delta_chain *deltas, struct got_pack *pack, FILE *outfile,
1055 FILE *base_file, FILE *accum_file)
1057 const struct got_error *err = NULL;
1058 struct got_delta *delta;
1059 uint8_t *base_buf = NULL, *accum_buf = NULL, *delta_buf;
1060 size_t base_bufsz = 0, accum_size = 0, delta_len;
1066 if (SIMPLEQ_EMPTY(&deltas->entries))
1067 return got_error(GOT_ERR_BAD_DELTA_CHAIN);
1069 /* We process small enough files entirely in memory for speed. */
1070 err = got_pack_get_delta_chain_max_size(&max_size, deltas, pack);
1073 if (max_size < GOT_DELTA_RESULT_SIZE_CACHED_MAX) {
1074 accum_buf = malloc(max_size);
1075 if (accum_buf == NULL)
1076 return got_error_from_errno("malloc");
1081 /* Deltas are ordered in ascending order. */
1082 SIMPLEQ_FOREACH(delta, &deltas->entries, entry) {
1086 off_t delta_data_offset;
1088 /* Plain object types are the delta base. */
1089 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1090 delta->type != GOT_OBJ_TYPE_TREE &&
1091 delta->type != GOT_OBJ_TYPE_BLOB &&
1092 delta->type != GOT_OBJ_TYPE_TAG) {
1093 err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1097 delta_data_offset = delta->offset + delta->tslen;
1098 if (delta_data_offset >= pack->filesize) {
1099 err = got_error(GOT_ERR_PACK_OFFSET);
1102 if (pack->map == NULL) {
1103 if (lseek(pack->fd, delta_data_offset, SEEK_SET)
1105 err = got_error_from_errno("lseek");
1111 mapoff = (size_t)delta_data_offset;
1112 err = got_inflate_to_file_mmap(
1113 &base_bufsz, NULL, NULL, pack->map,
1114 mapoff, pack->filesize - mapoff,
1117 err = got_inflate_to_file_fd(
1118 &base_bufsz, NULL, NULL, pack->fd,
1122 mapoff = (size_t)delta_data_offset;
1123 err = got_inflate_to_mem_mmap(&base_buf,
1124 &base_bufsz, NULL, NULL,
1126 pack->filesize - mapoff);
1128 err = got_inflate_to_mem_fd(&base_buf,
1129 &base_bufsz, NULL, NULL, max_size,
1140 got_delta_cache_get(&delta_buf, &delta_len,
1141 pack->delta_cache, delta->data_offset);
1142 if (delta_buf == NULL) {
1144 err = read_delta_data(&delta_buf, &delta_len,
1145 delta->data_offset, pack);
1148 err = got_delta_cache_add(pack->delta_cache,
1149 delta->data_offset, delta_buf, delta_len);
1152 else if (err->code != GOT_ERR_NO_SPACE) {
1158 err = got_delta_apply_in_mem(base_buf, base_bufsz,
1159 delta_buf, delta_len, accum_buf,
1160 &accum_size, max_size);
1163 err = got_delta_apply(base_file, delta_buf,
1165 /* Final delta application writes to output file. */
1166 ++n < deltas->nentries ? accum_file : outfile,
1174 if (n < deltas->nentries) {
1175 /* Accumulated delta becomes the new base. */
1177 uint8_t *tmp = accum_buf;
1179 * Base buffer switches roles with accumulation
1180 * buffer. Ensure it can hold the largest
1181 * result in the delta chain. The initial
1182 * allocation might have been smaller.
1184 if (base_bufsz < max_size) {
1186 p = reallocarray(base_buf, 1, max_size);
1188 err = got_error_from_errno(
1193 base_bufsz = max_size;
1195 accum_buf = base_buf;
1198 FILE *tmp = accum_file;
1199 accum_file = base_file;
1210 size_t len = fwrite(accum_buf, 1, accum_size, outfile);
1212 if (len != accum_size)
1213 err = got_ferror(outfile, GOT_ERR_IO);
1217 *result_size = accum_size;
1221 const struct got_error *
1222 got_pack_dump_delta_chain_to_mem(uint8_t **outbuf, size_t *outlen,
1223 struct got_delta_chain *deltas, struct got_pack *pack)
1225 const struct got_error *err = NULL;
1226 struct got_delta *delta;
1227 uint8_t *base_buf = NULL, *accum_buf = NULL, *delta_buf;
1228 size_t base_bufsz = 0, accum_size = 0, delta_len;
1235 if (SIMPLEQ_EMPTY(&deltas->entries))
1236 return got_error(GOT_ERR_BAD_DELTA_CHAIN);
1238 err = got_pack_get_delta_chain_max_size(&max_size, deltas, pack);
1241 accum_buf = malloc(max_size);
1242 if (accum_buf == NULL)
1243 return got_error_from_errno("malloc");
1245 /* Deltas are ordered in ascending order. */
1246 SIMPLEQ_FOREACH(delta, &deltas->entries, entry) {
1249 size_t delta_data_offset;
1251 /* Plain object types are the delta base. */
1252 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1253 delta->type != GOT_OBJ_TYPE_TREE &&
1254 delta->type != GOT_OBJ_TYPE_BLOB &&
1255 delta->type != GOT_OBJ_TYPE_TAG) {
1256 err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1260 delta_data_offset = delta->offset + delta->tslen;
1261 if (delta_data_offset >= pack->filesize) {
1262 err = got_error(GOT_ERR_PACK_OFFSET);
1266 size_t mapoff = (size_t)delta_data_offset;
1267 err = got_inflate_to_mem_mmap(&base_buf,
1268 &base_bufsz, NULL, NULL, pack->map,
1269 mapoff, pack->filesize - mapoff);
1271 if (lseek(pack->fd, delta_data_offset, SEEK_SET)
1273 err = got_error_from_errno("lseek");
1276 err = got_inflate_to_mem_fd(&base_buf,
1277 &base_bufsz, NULL, NULL, max_size,
1286 got_delta_cache_get(&delta_buf, &delta_len,
1287 pack->delta_cache, delta->data_offset);
1288 if (delta_buf == NULL) {
1290 err = read_delta_data(&delta_buf, &delta_len,
1291 delta->data_offset, pack);
1294 err = got_delta_cache_add(pack->delta_cache,
1295 delta->data_offset, delta_buf, delta_len);
1298 else if (err->code != GOT_ERR_NO_SPACE) {
1303 err = got_delta_apply_in_mem(base_buf, base_bufsz,
1304 delta_buf, delta_len, accum_buf,
1305 &accum_size, max_size);
1312 if (n < deltas->nentries) {
1313 /* Accumulated delta becomes the new base. */
1314 uint8_t *tmp = accum_buf;
1316 * Base buffer switches roles with accumulation buffer.
1317 * Ensure it can hold the largest result in the delta
1318 * chain. Initial allocation might have been smaller.
1320 if (base_bufsz < max_size) {
1322 p = reallocarray(base_buf, 1, max_size);
1324 err = got_error_from_errno(
1329 base_bufsz = max_size;
1331 accum_buf = base_buf;
1343 *outbuf = accum_buf;
1344 *outlen = accum_size;
1349 const struct got_error *
1350 got_packfile_extract_object(struct got_pack *pack, struct got_object *obj,
1351 FILE *outfile, FILE *base_file, FILE *accum_file)
1353 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 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0) {
1359 if (obj->pack_offset >= pack->filesize)
1360 return got_error(GOT_ERR_PACK_OFFSET);
1363 size_t mapoff = (size_t)obj->pack_offset;
1364 err = got_inflate_to_file_mmap(&obj->size, NULL, NULL,
1365 pack->map, mapoff, pack->filesize - mapoff,
1368 if (lseek(pack->fd, obj->pack_offset, SEEK_SET) == -1)
1369 return got_error_from_errno("lseek");
1370 err = got_inflate_to_file_fd(&obj->size, NULL, NULL,
1374 err = got_pack_dump_delta_chain_to_file(&obj->size,
1375 &obj->deltas, pack, outfile, base_file, accum_file);
1380 const struct got_error *
1381 got_packfile_extract_object_to_mem(uint8_t **buf, size_t *len,
1382 struct got_object *obj, struct got_pack *pack)
1384 const struct got_error *err = NULL;
1386 if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
1387 return got_error(GOT_ERR_OBJ_NOT_PACKED);
1389 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0) {
1390 if (obj->pack_offset >= pack->filesize)
1391 return got_error(GOT_ERR_PACK_OFFSET);
1393 size_t mapoff = (size_t)obj->pack_offset;
1394 err = got_inflate_to_mem_mmap(buf, len, NULL, NULL,
1395 pack->map, mapoff, pack->filesize - mapoff);
1397 if (lseek(pack->fd, obj->pack_offset, SEEK_SET) == -1)
1398 return got_error_from_errno("lseek");
1399 err = got_inflate_to_mem_fd(buf, len, NULL, NULL,
1400 obj->size, pack->fd);
1403 err = got_pack_dump_delta_chain_to_mem(buf, len, &obj->deltas,