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>
32 #include "got_error.h"
33 #include "got_object.h"
34 #include "got_opentemp.h"
37 #include "got_lib_sha1.h"
38 #include "got_lib_delta.h"
39 #include "got_lib_delta_cache.h"
40 #include "got_lib_inflate.h"
41 #include "got_lib_object.h"
42 #include "got_lib_object_parse.h"
43 #include "got_lib_privsep.h"
44 #include "got_lib_pack.h"
47 #define nitems(_a) (sizeof(_a) / sizeof((_a)[0]))
51 #define MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
54 static const struct got_error *
55 verify_fanout_table(uint32_t *fanout_table)
59 for (i = 0; i < 0xff - 1; i++) {
60 if (be32toh(fanout_table[i]) > be32toh(fanout_table[i + 1]))
61 return got_error(GOT_ERR_BAD_PACKIDX);
67 const struct got_error *
68 got_packidx_init_hdr(struct got_packidx *p, int verify, off_t packfile_size)
70 const struct got_error *err = NULL;
71 struct got_packidx_v2_hdr *h;
73 uint8_t sha1[SHA1_DIGEST_LENGTH];
74 size_t nobj, len_fanout, len_ids, offset, remain;
84 if (remain < sizeof(*h->magic)) {
85 err = got_error(GOT_ERR_BAD_PACKIDX);
89 h->magic = (uint32_t *)(p->map + offset);
91 h->magic = malloc(sizeof(*h->magic));
92 if (h->magic == NULL) {
93 err = got_error_from_errno("malloc");
96 n = read(p->fd, h->magic, sizeof(*h->magic));
98 err = got_error_from_errno("read");
100 } else if (n != sizeof(*h->magic)) {
101 err = got_error(GOT_ERR_BAD_PACKIDX);
105 if (*h->magic != htobe32(GOT_PACKIDX_V2_MAGIC)) {
106 err = got_error(GOT_ERR_BAD_PACKIDX);
109 offset += sizeof(*h->magic);
110 remain -= sizeof(*h->magic);
113 SHA1Update(&ctx, (uint8_t *)h->magic, sizeof(*h->magic));
115 if (remain < sizeof(*h->version)) {
116 err = got_error(GOT_ERR_BAD_PACKIDX);
120 h->version = (uint32_t *)(p->map + offset);
122 h->version = malloc(sizeof(*h->version));
123 if (h->version == NULL) {
124 err = got_error_from_errno("malloc");
127 n = read(p->fd, h->version, sizeof(*h->version));
129 err = got_error_from_errno("read");
131 } else if (n != sizeof(*h->version)) {
132 err = got_error(GOT_ERR_BAD_PACKIDX);
136 if (*h->version != htobe32(GOT_PACKIDX_VERSION)) {
137 err = got_error(GOT_ERR_BAD_PACKIDX);
140 offset += sizeof(*h->version);
141 remain -= sizeof(*h->version);
144 SHA1Update(&ctx, (uint8_t *)h->version, sizeof(*h->version));
147 sizeof(*h->fanout_table) * GOT_PACKIDX_V2_FANOUT_TABLE_ITEMS;
148 if (remain < len_fanout) {
149 err = got_error(GOT_ERR_BAD_PACKIDX);
153 h->fanout_table = (uint32_t *)(p->map + offset);
155 h->fanout_table = malloc(len_fanout);
156 if (h->fanout_table == NULL) {
157 err = got_error_from_errno("malloc");
160 n = read(p->fd, h->fanout_table, len_fanout);
162 err = got_error_from_errno("read");
164 } else if (n != len_fanout) {
165 err = got_error(GOT_ERR_BAD_PACKIDX);
169 err = verify_fanout_table(h->fanout_table);
173 SHA1Update(&ctx, (uint8_t *)h->fanout_table, len_fanout);
174 offset += len_fanout;
175 remain -= len_fanout;
177 nobj = be32toh(h->fanout_table[0xff]);
178 len_ids = nobj * sizeof(*h->sorted_ids);
179 if (len_ids <= nobj || len_ids > remain) {
180 err = got_error(GOT_ERR_BAD_PACKIDX);
185 (struct got_packidx_object_id *)((uint8_t*)(p->map + offset));
187 h->sorted_ids = malloc(len_ids);
188 if (h->sorted_ids == NULL) {
189 err = got_error(GOT_ERR_BAD_PACKIDX);
192 n = read(p->fd, h->sorted_ids, len_ids);
194 err = got_error_from_errno("read");
195 else if (n != len_ids) {
196 err = got_error(GOT_ERR_BAD_PACKIDX);
201 SHA1Update(&ctx, (uint8_t *)h->sorted_ids, len_ids);
205 if (remain < nobj * sizeof(*h->crc32)) {
206 err = got_error(GOT_ERR_BAD_PACKIDX);
210 h->crc32 = (uint32_t *)((uint8_t*)(p->map + offset));
212 h->crc32 = malloc(nobj * sizeof(*h->crc32));
213 if (h->crc32 == NULL) {
214 err = got_error_from_errno("malloc");
217 n = read(p->fd, h->crc32, nobj * sizeof(*h->crc32));
219 err = got_error_from_errno("read");
220 else if (n != nobj * sizeof(*h->crc32)) {
221 err = got_error(GOT_ERR_BAD_PACKIDX);
226 SHA1Update(&ctx, (uint8_t *)h->crc32, nobj * sizeof(*h->crc32));
227 remain -= nobj * sizeof(*h->crc32);
228 offset += nobj * sizeof(*h->crc32);
230 if (remain < nobj * sizeof(*h->offsets)) {
231 err = got_error(GOT_ERR_BAD_PACKIDX);
235 h->offsets = (uint32_t *)((uint8_t*)(p->map + offset));
237 h->offsets = malloc(nobj * sizeof(*h->offsets));
238 if (h->offsets == NULL) {
239 err = got_error_from_errno("malloc");
242 n = read(p->fd, h->offsets, nobj * sizeof(*h->offsets));
244 err = got_error_from_errno("read");
245 else if (n != nobj * sizeof(*h->offsets)) {
246 err = got_error(GOT_ERR_BAD_PACKIDX);
251 SHA1Update(&ctx, (uint8_t *)h->offsets,
252 nobj * sizeof(*h->offsets));
253 remain -= nobj * sizeof(*h->offsets);
254 offset += nobj * sizeof(*h->offsets);
256 /* Large file offsets are contained only in files > 2GB. */
257 if (verify || packfile_size > 0x7fffffff) {
258 for (i = 0; i < nobj; i++) {
259 uint32_t o = h->offsets[i];
260 if (o & htobe32(GOT_PACKIDX_OFFSET_VAL_IS_LARGE_IDX))
264 if (p->nlargeobj == 0)
266 else if (packfile_size <= 0x7fffffff) {
267 err = got_error(GOT_ERR_BAD_PACKIDX);
271 if (remain < p->nlargeobj * sizeof(*h->large_offsets)) {
272 err = got_error(GOT_ERR_BAD_PACKIDX);
276 h->large_offsets = (uint64_t *)((uint8_t*)(p->map + offset));
278 h->large_offsets = malloc(p->nlargeobj *
279 sizeof(*h->large_offsets));
280 if (h->large_offsets == NULL) {
281 err = got_error_from_errno("malloc");
284 n = read(p->fd, h->large_offsets,
285 p->nlargeobj * sizeof(*h->large_offsets));
287 err = got_error_from_errno("read");
288 else if (n != p->nlargeobj * sizeof(*h->large_offsets)) {
289 err = got_error(GOT_ERR_BAD_PACKIDX);
294 SHA1Update(&ctx, (uint8_t*)h->large_offsets,
295 p->nlargeobj * sizeof(*h->large_offsets));
296 remain -= p->nlargeobj * sizeof(*h->large_offsets);
297 offset += p->nlargeobj * sizeof(*h->large_offsets);
300 if (remain < sizeof(*h->trailer)) {
301 err = got_error(GOT_ERR_BAD_PACKIDX);
306 (struct got_packidx_trailer *)((uint8_t*)(p->map + offset));
308 h->trailer = malloc(sizeof(*h->trailer));
309 if (h->trailer == NULL) {
310 err = got_error_from_errno("malloc");
313 n = read(p->fd, h->trailer, sizeof(*h->trailer));
315 err = got_error_from_errno("read");
316 else if (n != sizeof(*h->trailer)) {
317 err = got_error(GOT_ERR_BAD_PACKIDX);
322 SHA1Update(&ctx, h->trailer->packfile_sha1, SHA1_DIGEST_LENGTH);
323 SHA1Final(sha1, &ctx);
324 if (memcmp(h->trailer->packidx_sha1, sha1,
325 SHA1_DIGEST_LENGTH) != 0)
326 err = got_error(GOT_ERR_PACKIDX_CSUM);
332 const struct got_error *
333 got_packidx_open(struct got_packidx **packidx,
334 int dir_fd, const char *relpath, int verify)
336 const struct got_error *err = NULL;
337 struct got_packidx *p = NULL;
339 struct stat idx_sb, pack_sb;
343 err = got_packidx_get_packfile_path(&pack_relpath, relpath);
348 * Ensure that a corresponding pack file exists.
349 * Some Git repositories have this problem. Git seems to ignore
350 * the existence of lonely pack index files but we do not.
352 if (fstatat(dir_fd, pack_relpath, &pack_sb, 0) == -1) {
353 if (errno == ENOENT) {
354 err = got_error_fmt(GOT_ERR_LONELY_PACKIDX,
357 err = got_error_from_errno2("fstatat", pack_relpath);
361 p = calloc(1, sizeof(*p));
363 err = got_error_from_errno("calloc");
367 p->fd = openat(dir_fd, relpath, O_RDONLY | O_NOFOLLOW | O_CLOEXEC);
369 err = got_error_from_errno2("openat", relpath);
373 if (fstat(p->fd, &idx_sb) != 0) {
374 err = got_error_from_errno2("fstat", relpath);
377 p->len = idx_sb.st_size;
378 if (p->len < sizeof(p->hdr)) {
379 err = got_error(GOT_ERR_BAD_PACKIDX);
383 p->path_packidx = strdup(relpath);
384 if (p->path_packidx == NULL) {
385 err = got_error_from_errno("strdup");
389 #ifndef GOT_PACK_NO_MMAP
390 p->map = mmap(NULL, p->len, PROT_READ, MAP_PRIVATE, p->fd, 0);
391 if (p->map == MAP_FAILED) {
392 if (errno != ENOMEM) {
393 err = got_error_from_errno("mmap");
396 p->map = NULL; /* fall back to read(2) */
400 err = got_packidx_init_hdr(p, verify, pack_sb.st_size);
404 got_packidx_close(p);
411 const struct got_error *
412 got_packidx_close(struct got_packidx *packidx)
414 const struct got_error *err = NULL;
416 free(packidx->path_packidx);
418 if (munmap(packidx->map, packidx->len) == -1)
419 err = got_error_from_errno("munmap");
421 free(packidx->hdr.magic);
422 free(packidx->hdr.version);
423 free(packidx->hdr.fanout_table);
424 free(packidx->hdr.sorted_ids);
425 free(packidx->hdr.crc32);
426 free(packidx->hdr.offsets);
427 free(packidx->hdr.large_offsets);
428 free(packidx->hdr.trailer);
430 if (close(packidx->fd) == -1 && err == NULL)
431 err = got_error_from_errno("close");
437 const struct got_error *
438 got_packidx_get_packfile_path(char **path_packfile, const char *path_packidx)
442 /* Packfile path contains ".pack" instead of ".idx", so add one byte. */
443 size = strlen(path_packidx) + 2;
444 if (size < GOT_PACKFILE_NAMELEN + 1)
445 return got_error_path(path_packidx, GOT_ERR_BAD_PATH);
447 *path_packfile = malloc(size);
448 if (*path_packfile == NULL)
449 return got_error_from_errno("malloc");
451 /* Copy up to and excluding ".idx". */
452 if (strlcpy(*path_packfile, path_packidx,
453 size - strlen(GOT_PACKIDX_SUFFIX) - 1) >= size)
454 return got_error(GOT_ERR_NO_SPACE);
456 if (strlcat(*path_packfile, GOT_PACKFILE_SUFFIX, size) >= size)
457 return got_error(GOT_ERR_NO_SPACE);
463 got_packidx_get_object_offset(struct got_packidx *packidx, int idx)
465 uint32_t offset = be32toh(packidx->hdr.offsets[idx]);
466 if (offset & GOT_PACKIDX_OFFSET_VAL_IS_LARGE_IDX) {
468 idx = offset & GOT_PACKIDX_OFFSET_VAL_MASK;
469 if (idx < 0 || idx >= packidx->nlargeobj ||
470 packidx->hdr.large_offsets == NULL)
472 loffset = be64toh(packidx->hdr.large_offsets[idx]);
473 return (loffset > INT64_MAX ? -1 : (off_t)loffset);
475 return (off_t)(offset & GOT_PACKIDX_OFFSET_VAL_MASK);
479 got_packidx_get_object_idx(struct got_packidx *packidx,
480 struct got_object_id *id)
482 u_int8_t id0 = id->sha1[0];
483 uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
484 int left = 0, right = totobj - 1;
487 left = be32toh(packidx->hdr.fanout_table[id0 - 1]);
489 while (left <= right) {
490 struct got_packidx_object_id *oid;
493 i = ((left + right) / 2);
494 oid = &packidx->hdr.sorted_ids[i];
495 cmp = memcmp(id->sha1, oid->sha1, SHA1_DIGEST_LENGTH);
507 const struct got_error *
508 got_packidx_match_id_str_prefix(struct got_object_id_queue *matched_ids,
509 struct got_packidx *packidx, const char *id_str_prefix)
511 const struct got_error *err = NULL;
513 uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
515 size_t prefix_len = strlen(id_str_prefix);
516 struct got_packidx_object_id *oid;
519 STAILQ_INIT(matched_ids);
522 return got_error_path(id_str_prefix, GOT_ERR_BAD_OBJ_ID_STR);
524 hex[0] = id_str_prefix[0];
525 hex[1] = id_str_prefix[1];
527 if (!got_parse_xdigit(&id0, hex))
528 return got_error_path(id_str_prefix, GOT_ERR_BAD_OBJ_ID_STR);
531 i = be32toh(packidx->hdr.fanout_table[id0 - 1]);
532 oid = &packidx->hdr.sorted_ids[i];
533 while (i < totobj && oid->sha1[0] == id0) {
534 char id_str[SHA1_DIGEST_STRING_LENGTH];
535 struct got_object_qid *qid;
538 if (!got_sha1_digest_to_str(oid->sha1, id_str, sizeof(id_str)))
539 return got_error(GOT_ERR_NO_SPACE);
541 cmp = strncmp(id_str, id_str_prefix, prefix_len);
543 oid = &packidx->hdr.sorted_ids[++i];
548 err = got_object_qid_alloc_partial(&qid);
551 memcpy(qid->id->sha1, oid->sha1, SHA1_DIGEST_LENGTH);
552 STAILQ_INSERT_TAIL(matched_ids, qid, entry);
554 oid = &packidx->hdr.sorted_ids[++i];
558 got_object_id_queue_free(matched_ids);
562 static const struct got_error *
563 pack_stop_privsep_child(struct got_pack *pack)
565 const struct got_error *err = NULL;
567 if (pack->privsep_child == NULL)
570 err = got_privsep_send_stop(pack->privsep_child->imsg_fd);
573 err = got_privsep_wait_for_child(pack->privsep_child->pid);
574 if (close(pack->privsep_child->imsg_fd) == -1 && err == NULL)
575 err = got_error_from_errno("close");
576 imsg_clear(pack->privsep_child->ibuf);
577 free(pack->privsep_child->ibuf);
578 free(pack->privsep_child);
579 pack->privsep_child = NULL;
583 const struct got_error *
584 got_pack_close(struct got_pack *pack)
586 const struct got_error *err = NULL;
588 err = pack_stop_privsep_child(pack);
589 if (pack->map && munmap(pack->map, pack->filesize) == -1 && !err)
590 err = got_error_from_errno("munmap");
591 if (pack->fd != -1 && close(pack->fd) == -1 && err == NULL)
592 err = got_error_from_errno("close");
594 free(pack->path_packfile);
595 pack->path_packfile = NULL;
597 if (pack->delta_cache) {
598 got_delta_cache_free(pack->delta_cache);
599 pack->delta_cache = NULL;
605 const struct got_error *
606 got_pack_parse_object_type_and_size(uint8_t *type, uint64_t *size, size_t *len,
607 struct got_pack *pack, off_t offset)
617 if (offset >= pack->filesize)
618 return got_error(GOT_ERR_PACK_OFFSET);
621 mapoff = (size_t)offset;
623 if (lseek(pack->fd, offset, SEEK_SET) == -1)
624 return got_error_from_errno("lseek");
628 /* We do not support size values which don't fit in 64 bit. */
630 return got_error(GOT_ERR_NO_SPACE);
633 if (mapoff + sizeof(sizeN) >= pack->filesize)
634 return got_error(GOT_ERR_BAD_PACKFILE);
635 sizeN = *(pack->map + mapoff);
636 mapoff += sizeof(sizeN);
638 ssize_t n = read(pack->fd, &sizeN, sizeof(sizeN));
640 return got_error_from_errno("read");
641 if (n != sizeof(sizeN))
642 return got_error(GOT_ERR_BAD_PACKFILE);
644 *len += sizeof(sizeN);
647 t = (sizeN & GOT_PACK_OBJ_SIZE0_TYPE_MASK) >>
648 GOT_PACK_OBJ_SIZE0_TYPE_MASK_SHIFT;
649 s = (sizeN & GOT_PACK_OBJ_SIZE0_VAL_MASK);
651 size_t shift = 4 + 7 * (i - 1);
652 s |= ((sizeN & GOT_PACK_OBJ_SIZE_VAL_MASK) << shift);
655 } while (sizeN & GOT_PACK_OBJ_SIZE_MORE);
662 static const struct got_error *
663 open_plain_object(struct got_object **obj, struct got_object_id *id,
664 uint8_t type, off_t offset, size_t size, int idx)
666 *obj = calloc(1, sizeof(**obj));
668 return got_error_from_errno("calloc");
671 (*obj)->flags = GOT_OBJ_FLAG_PACKED;
672 (*obj)->pack_idx = idx;
675 memcpy(&(*obj)->id, id, sizeof((*obj)->id));
676 (*obj)->pack_offset = offset;
681 static const struct got_error *
682 parse_negative_offset(int64_t *offset, size_t *len, struct got_pack *pack,
693 /* We do not support offset values which don't fit in 64 bit. */
695 return got_error(GOT_ERR_NO_SPACE);
699 mapoff = (size_t)delta_offset + *len;
700 if (mapoff + sizeof(offN) >= pack->filesize)
701 return got_error(GOT_ERR_PACK_OFFSET);
702 offN = *(pack->map + mapoff);
705 n = read(pack->fd, &offN, sizeof(offN));
707 return got_error_from_errno("read");
708 if (n != sizeof(offN))
709 return got_error(GOT_ERR_BAD_PACKFILE);
711 *len += sizeof(offN);
714 o = (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
718 o += (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
721 } while (offN & GOT_PACK_OBJ_DELTA_OFF_MORE);
727 const struct got_error *
728 got_pack_parse_offset_delta(off_t *base_offset, size_t *len,
729 struct got_pack *pack, off_t offset, int tslen)
731 const struct got_error *err;
737 err = parse_negative_offset(&negoffset, &negofflen, pack,
742 /* Compute the base object's offset (must be in the same pack file). */
743 *base_offset = (offset - negoffset);
744 if (*base_offset <= 0)
745 return got_error(GOT_ERR_BAD_PACKFILE);
751 static const struct got_error *
752 read_delta_data(uint8_t **delta_buf, size_t *delta_len,
753 size_t delta_data_offset, struct got_pack *pack)
755 const struct got_error *err = NULL;
758 if (delta_data_offset >= pack->filesize)
759 return got_error(GOT_ERR_PACK_OFFSET);
760 err = got_inflate_to_mem_mmap(delta_buf, delta_len,
761 NULL, NULL, pack->map, delta_data_offset,
762 pack->filesize - delta_data_offset);
764 if (lseek(pack->fd, delta_data_offset, SEEK_SET) == -1)
765 return got_error_from_errno("lseek");
766 err = got_inflate_to_mem_fd(delta_buf, delta_len, NULL,
772 static const struct got_error *
773 add_delta(struct got_delta_chain *deltas, off_t delta_offset, size_t tslen,
774 int delta_type, size_t delta_size, size_t delta_data_offset)
776 struct got_delta *delta;
778 delta = got_delta_open(delta_offset, tslen, delta_type, delta_size,
781 return got_error_from_errno("got_delta_open");
782 /* delta is freed in got_object_close() */
784 STAILQ_INSERT_HEAD(&deltas->entries, delta, entry);
788 static const struct got_error *
789 resolve_offset_delta(struct got_delta_chain *deltas,
790 struct got_packidx *packidx, struct got_pack *pack, off_t delta_offset,
791 size_t tslen, int delta_type, size_t delta_size, unsigned int recursion)
794 const struct got_error *err;
799 off_t delta_data_offset;
802 err = got_pack_parse_offset_delta(&base_offset, &consumed, pack,
803 delta_offset, tslen);
807 delta_data_offset = delta_offset + tslen + consumed;
808 if (delta_data_offset >= pack->filesize)
809 return got_error(GOT_ERR_PACK_OFFSET);
811 if (pack->map == NULL) {
812 delta_data_offset = lseek(pack->fd, 0, SEEK_CUR);
813 if (delta_data_offset == -1)
814 return got_error_from_errno("lseek");
817 err = add_delta(deltas, delta_offset, tslen, delta_type, delta_size,
822 /* An offset delta must be in the same packfile. */
823 if (base_offset >= pack->filesize)
824 return got_error(GOT_ERR_PACK_OFFSET);
826 err = got_pack_parse_object_type_and_size(&base_type, &base_size,
827 &base_tslen, pack, base_offset);
831 return got_pack_resolve_delta_chain(deltas, packidx, pack, base_offset,
832 base_tslen, base_type, base_size, recursion - 1);
835 const struct got_error *
836 got_pack_parse_ref_delta(struct got_object_id *id,
837 struct got_pack *pack, off_t delta_offset, int tslen)
840 size_t mapoff = delta_offset + tslen;
841 if (mapoff + sizeof(*id) >= pack->filesize)
842 return got_error(GOT_ERR_PACK_OFFSET);
843 memcpy(id, pack->map + mapoff, sizeof(*id));
846 n = read(pack->fd, id, sizeof(*id));
848 return got_error_from_errno("read");
849 if (n != sizeof(*id))
850 return got_error(GOT_ERR_BAD_PACKFILE);
856 static const struct got_error *
857 resolve_ref_delta(struct got_delta_chain *deltas, struct got_packidx *packidx,
858 struct got_pack *pack, off_t delta_offset, size_t tslen, int delta_type,
859 size_t delta_size, unsigned int recursion)
861 const struct got_error *err;
862 struct got_object_id id;
868 off_t delta_data_offset;
870 if (delta_offset + tslen >= pack->filesize)
871 return got_error(GOT_ERR_PACK_OFFSET);
873 err = got_pack_parse_ref_delta(&id, pack, delta_offset, tslen);
877 delta_data_offset = delta_offset + tslen + sizeof(id);
879 delta_data_offset = lseek(pack->fd, 0, SEEK_CUR);
880 if (delta_data_offset == -1)
881 return got_error_from_errno("lseek");
884 err = add_delta(deltas, delta_offset, tslen, delta_type, delta_size,
889 /* Delta base must be in the same pack file. */
890 idx = got_packidx_get_object_idx(packidx, &id);
892 return got_error(GOT_ERR_NO_OBJ);
894 base_offset = got_packidx_get_object_offset(packidx, idx);
895 if (base_offset == (uint64_t)-1)
896 return got_error(GOT_ERR_BAD_PACKIDX);
898 if (base_offset >= pack->filesize)
899 return got_error(GOT_ERR_PACK_OFFSET);
901 err = got_pack_parse_object_type_and_size(&base_type, &base_size,
902 &base_tslen, pack, base_offset);
906 return got_pack_resolve_delta_chain(deltas, packidx, pack, base_offset,
907 base_tslen, base_type, base_size, recursion - 1);
910 const struct got_error *
911 got_pack_resolve_delta_chain(struct got_delta_chain *deltas,
912 struct got_packidx *packidx, struct got_pack *pack, off_t delta_offset,
913 size_t tslen, int delta_type, size_t delta_size, unsigned int recursion)
915 const struct got_error *err = NULL;
917 if (--recursion == 0)
918 return got_error(GOT_ERR_RECURSION);
920 switch (delta_type) {
921 case GOT_OBJ_TYPE_COMMIT:
922 case GOT_OBJ_TYPE_TREE:
923 case GOT_OBJ_TYPE_BLOB:
924 case GOT_OBJ_TYPE_TAG:
925 /* Plain types are the final delta base. Recursion ends. */
926 err = add_delta(deltas, delta_offset, tslen, delta_type,
929 case GOT_OBJ_TYPE_OFFSET_DELTA:
930 err = resolve_offset_delta(deltas, packidx, pack,
931 delta_offset, tslen, delta_type, delta_size, recursion - 1);
933 case GOT_OBJ_TYPE_REF_DELTA:
934 err = resolve_ref_delta(deltas, packidx, pack,
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_packidx *packidx,
946 struct got_pack *pack, struct got_object_id *id, off_t offset,
947 size_t tslen, int delta_type, size_t delta_size, int idx)
949 const struct got_error *err = NULL;
952 *obj = calloc(1, sizeof(**obj));
954 return got_error_from_errno("calloc");
958 (*obj)->size = 0; /* Not known because deltas aren't applied yet. */
959 memcpy(&(*obj)->id, id, sizeof((*obj)->id));
960 (*obj)->pack_offset = offset + tslen;
962 STAILQ_INIT(&(*obj)->deltas.entries);
963 (*obj)->flags |= GOT_OBJ_FLAG_DELTIFIED;
964 (*obj)->flags |= GOT_OBJ_FLAG_PACKED;
965 (*obj)->pack_idx = idx;
967 err = got_pack_resolve_delta_chain(&(*obj)->deltas, packidx, pack,
968 offset, tslen, delta_type, delta_size,
969 GOT_DELTA_CHAIN_RECURSION_MAX);
973 err = got_delta_chain_get_base_type(&resolved_type, &(*obj)->deltas);
976 (*obj)->type = resolved_type;
979 got_object_close(*obj);
985 const struct got_error *
986 got_packfile_open_object(struct got_object **obj, struct got_pack *pack,
987 struct got_packidx *packidx, int idx, struct got_object_id *id)
989 const struct got_error *err = NULL;
997 offset = got_packidx_get_object_offset(packidx, idx);
998 if (offset == (uint64_t)-1)
999 return got_error(GOT_ERR_BAD_PACKIDX);
1001 err = got_pack_parse_object_type_and_size(&type, &size, &tslen,
1007 case GOT_OBJ_TYPE_COMMIT:
1008 case GOT_OBJ_TYPE_TREE:
1009 case GOT_OBJ_TYPE_BLOB:
1010 case GOT_OBJ_TYPE_TAG:
1011 err = open_plain_object(obj, id, type, offset + tslen,
1014 case GOT_OBJ_TYPE_OFFSET_DELTA:
1015 case GOT_OBJ_TYPE_REF_DELTA:
1016 err = open_delta_object(obj, packidx, pack, id, offset,
1017 tslen, type, size, idx);
1020 err = got_error(GOT_ERR_OBJ_TYPE);
1027 const struct got_error *
1028 got_pack_get_delta_chain_max_size(uint64_t *max_size,
1029 struct got_delta_chain *deltas, struct got_pack *pack)
1031 struct got_delta *delta;
1032 uint64_t base_size = 0, result_size = 0;
1035 STAILQ_FOREACH(delta, &deltas->entries, entry) {
1036 /* Plain object types are the delta base. */
1037 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1038 delta->type != GOT_OBJ_TYPE_TREE &&
1039 delta->type != GOT_OBJ_TYPE_BLOB &&
1040 delta->type != GOT_OBJ_TYPE_TAG) {
1041 const struct got_error *err;
1046 got_delta_cache_get(&delta_buf, &delta_len,
1047 pack->delta_cache, delta->data_offset);
1048 if (delta_buf == NULL) {
1050 err = read_delta_data(&delta_buf, &delta_len,
1051 delta->data_offset, pack);
1054 err = got_delta_cache_add(pack->delta_cache,
1055 delta->data_offset, delta_buf, delta_len);
1058 else if (err->code != GOT_ERR_NO_SPACE) {
1063 err = got_delta_get_sizes(&base_size, &result_size,
1064 delta_buf, delta_len);
1070 base_size = delta->size;
1071 if (base_size > *max_size)
1072 *max_size = base_size;
1073 if (result_size > *max_size)
1074 *max_size = result_size;
1080 const struct got_error *
1081 got_pack_get_max_delta_object_size(uint64_t *size, struct got_object *obj,
1082 struct got_pack *pack)
1084 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0)
1085 return got_error(GOT_ERR_OBJ_TYPE);
1087 return got_pack_get_delta_chain_max_size(size, &obj->deltas, pack);
1090 const struct got_error *
1091 got_pack_dump_delta_chain_to_file(size_t *result_size,
1092 struct got_delta_chain *deltas, struct got_pack *pack, FILE *outfile,
1093 FILE *base_file, FILE *accum_file)
1095 const struct got_error *err = NULL;
1096 struct got_delta *delta;
1097 uint8_t *base_buf = NULL, *accum_buf = NULL, *delta_buf;
1098 size_t base_bufsz = 0, accum_size = 0, delta_len;
1104 if (STAILQ_EMPTY(&deltas->entries))
1105 return got_error(GOT_ERR_BAD_DELTA_CHAIN);
1107 /* We process small enough files entirely in memory for speed. */
1108 err = got_pack_get_delta_chain_max_size(&max_size, deltas, pack);
1111 if (max_size < GOT_DELTA_RESULT_SIZE_CACHED_MAX) {
1112 accum_buf = malloc(max_size);
1113 if (accum_buf == NULL)
1114 return got_error_from_errno("malloc");
1118 if (fseeko(base_file, 0L, SEEK_SET) == -1)
1119 return got_error_from_errno("fseeko");
1120 if (fseeko(accum_file, 0L, SEEK_SET) == -1)
1121 return got_error_from_errno("fseeko");
1124 /* Deltas are ordered in ascending order. */
1125 STAILQ_FOREACH(delta, &deltas->entries, entry) {
1129 off_t delta_data_offset;
1131 /* Plain object types are the delta base. */
1132 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1133 delta->type != GOT_OBJ_TYPE_TREE &&
1134 delta->type != GOT_OBJ_TYPE_BLOB &&
1135 delta->type != GOT_OBJ_TYPE_TAG) {
1136 err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1140 delta_data_offset = delta->offset + delta->tslen;
1141 if (delta_data_offset >= pack->filesize) {
1142 err = got_error(GOT_ERR_PACK_OFFSET);
1145 if (pack->map == NULL) {
1146 if (lseek(pack->fd, delta_data_offset, SEEK_SET)
1148 err = got_error_from_errno("lseek");
1154 mapoff = (size_t)delta_data_offset;
1155 err = got_inflate_to_file_mmap(
1156 &base_bufsz, NULL, NULL, pack->map,
1157 mapoff, pack->filesize - mapoff,
1160 err = got_inflate_to_file_fd(
1161 &base_bufsz, NULL, NULL, pack->fd,
1165 mapoff = (size_t)delta_data_offset;
1166 err = got_inflate_to_mem_mmap(&base_buf,
1167 &base_bufsz, NULL, NULL,
1169 pack->filesize - mapoff);
1171 err = got_inflate_to_mem_fd(&base_buf,
1172 &base_bufsz, NULL, NULL, max_size,
1183 got_delta_cache_get(&delta_buf, &delta_len,
1184 pack->delta_cache, delta->data_offset);
1185 if (delta_buf == NULL) {
1187 err = read_delta_data(&delta_buf, &delta_len,
1188 delta->data_offset, pack);
1191 err = got_delta_cache_add(pack->delta_cache,
1192 delta->data_offset, delta_buf, delta_len);
1195 else if (err->code != GOT_ERR_NO_SPACE) {
1201 err = got_delta_apply_in_mem(base_buf, base_bufsz,
1202 delta_buf, delta_len, accum_buf,
1203 &accum_size, max_size);
1206 err = got_delta_apply(base_file, delta_buf,
1208 /* Final delta application writes to output file. */
1209 ++n < deltas->nentries ? accum_file : outfile,
1217 if (n < deltas->nentries) {
1218 /* Accumulated delta becomes the new base. */
1220 uint8_t *tmp = accum_buf;
1222 * Base buffer switches roles with accumulation
1223 * buffer. Ensure it can hold the largest
1224 * result in the delta chain. The initial
1225 * allocation might have been smaller.
1227 if (base_bufsz < max_size) {
1229 p = reallocarray(base_buf, 1, max_size);
1231 err = got_error_from_errno(
1236 base_bufsz = max_size;
1238 accum_buf = base_buf;
1241 FILE *tmp = accum_file;
1242 accum_file = base_file;
1253 size_t len = fwrite(accum_buf, 1, accum_size, outfile);
1255 if (len != accum_size)
1256 err = got_ferror(outfile, GOT_ERR_IO);
1260 *result_size = accum_size;
1264 const struct got_error *
1265 got_pack_dump_delta_chain_to_mem(uint8_t **outbuf, size_t *outlen,
1266 struct got_delta_chain *deltas, struct got_pack *pack)
1268 const struct got_error *err = NULL;
1269 struct got_delta *delta;
1270 uint8_t *base_buf = NULL, *accum_buf = NULL, *delta_buf;
1271 size_t base_bufsz = 0, accum_size = 0, delta_len;
1278 if (STAILQ_EMPTY(&deltas->entries))
1279 return got_error(GOT_ERR_BAD_DELTA_CHAIN);
1281 err = got_pack_get_delta_chain_max_size(&max_size, deltas, pack);
1284 accum_buf = malloc(max_size);
1285 if (accum_buf == NULL)
1286 return got_error_from_errno("malloc");
1288 /* Deltas are ordered in ascending order. */
1289 STAILQ_FOREACH(delta, &deltas->entries, entry) {
1292 size_t delta_data_offset;
1294 /* Plain object types are the delta base. */
1295 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1296 delta->type != GOT_OBJ_TYPE_TREE &&
1297 delta->type != GOT_OBJ_TYPE_BLOB &&
1298 delta->type != GOT_OBJ_TYPE_TAG) {
1299 err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1303 delta_data_offset = delta->offset + delta->tslen;
1304 if (delta_data_offset >= pack->filesize) {
1305 err = got_error(GOT_ERR_PACK_OFFSET);
1309 size_t mapoff = (size_t)delta_data_offset;
1310 err = got_inflate_to_mem_mmap(&base_buf,
1311 &base_bufsz, NULL, NULL, pack->map,
1312 mapoff, pack->filesize - mapoff);
1314 if (lseek(pack->fd, delta_data_offset, SEEK_SET)
1316 err = got_error_from_errno("lseek");
1319 err = got_inflate_to_mem_fd(&base_buf,
1320 &base_bufsz, NULL, NULL, max_size,
1329 got_delta_cache_get(&delta_buf, &delta_len,
1330 pack->delta_cache, delta->data_offset);
1331 if (delta_buf == NULL) {
1333 err = read_delta_data(&delta_buf, &delta_len,
1334 delta->data_offset, pack);
1337 err = got_delta_cache_add(pack->delta_cache,
1338 delta->data_offset, delta_buf, delta_len);
1341 else if (err->code != GOT_ERR_NO_SPACE) {
1346 err = got_delta_apply_in_mem(base_buf, base_bufsz,
1347 delta_buf, delta_len, accum_buf,
1348 &accum_size, max_size);
1355 if (n < deltas->nentries) {
1356 /* Accumulated delta becomes the new base. */
1357 uint8_t *tmp = accum_buf;
1359 * Base buffer switches roles with accumulation buffer.
1360 * Ensure it can hold the largest result in the delta
1361 * chain. Initial allocation might have been smaller.
1363 if (base_bufsz < max_size) {
1365 p = reallocarray(base_buf, 1, max_size);
1367 err = got_error_from_errno(
1372 base_bufsz = max_size;
1374 accum_buf = base_buf;
1386 *outbuf = accum_buf;
1387 *outlen = accum_size;
1392 const struct got_error *
1393 got_packfile_extract_object(struct got_pack *pack, struct got_object *obj,
1394 FILE *outfile, FILE *base_file, FILE *accum_file)
1396 const struct got_error *err = NULL;
1398 if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
1399 return got_error(GOT_ERR_OBJ_NOT_PACKED);
1401 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0) {
1402 if (obj->pack_offset >= pack->filesize)
1403 return got_error(GOT_ERR_PACK_OFFSET);
1406 size_t mapoff = (size_t)obj->pack_offset;
1407 err = got_inflate_to_file_mmap(&obj->size, NULL, NULL,
1408 pack->map, mapoff, pack->filesize - mapoff,
1411 if (lseek(pack->fd, obj->pack_offset, SEEK_SET) == -1)
1412 return got_error_from_errno("lseek");
1413 err = got_inflate_to_file_fd(&obj->size, NULL, NULL,
1417 err = got_pack_dump_delta_chain_to_file(&obj->size,
1418 &obj->deltas, pack, outfile, base_file, accum_file);
1423 const struct got_error *
1424 got_packfile_extract_object_to_mem(uint8_t **buf, size_t *len,
1425 struct got_object *obj, struct got_pack *pack)
1427 const struct got_error *err = NULL;
1429 if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
1430 return got_error(GOT_ERR_OBJ_NOT_PACKED);
1432 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0) {
1433 if (obj->pack_offset >= pack->filesize)
1434 return got_error(GOT_ERR_PACK_OFFSET);
1436 size_t mapoff = (size_t)obj->pack_offset;
1437 err = got_inflate_to_mem_mmap(buf, len, NULL, NULL,
1438 pack->map, mapoff, pack->filesize - mapoff);
1440 if (lseek(pack->fd, obj->pack_offset, SEEK_SET) == -1)
1441 return got_error_from_errno("lseek");
1442 err = got_inflate_to_mem_fd(buf, len, NULL, NULL,
1443 obj->size, pack->fd);
1446 err = got_pack_dump_delta_chain_to_mem(buf, len, &obj->deltas,