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, off_t packfile_size)
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 if (verify || packfile_size > 0x7fffffff) {
262 for (i = 0; i < nobj; i++) {
263 uint32_t o = h->offsets[i];
264 if (o & htobe32(GOT_PACKIDX_OFFSET_VAL_IS_LARGE_IDX))
268 if (p->nlargeobj == 0)
270 else if (packfile_size <= 0x7fffffff) {
271 err = got_error(GOT_ERR_BAD_PACKIDX);
275 if (remain < p->nlargeobj * sizeof(*h->large_offsets)) {
276 err = got_error(GOT_ERR_BAD_PACKIDX);
280 h->large_offsets = (uint64_t *)((uint8_t*)(p->map + offset));
282 h->large_offsets = malloc(p->nlargeobj *
283 sizeof(*h->large_offsets));
284 if (h->large_offsets == NULL) {
285 err = got_error_from_errno("malloc");
288 n = read(p->fd, h->large_offsets,
289 p->nlargeobj * sizeof(*h->large_offsets));
291 err = got_error_from_errno("read");
292 else if (n != p->nlargeobj * sizeof(*h->large_offsets)) {
293 err = got_error(GOT_ERR_BAD_PACKIDX);
298 SHA1Update(&ctx, (uint8_t*)h->large_offsets,
299 p->nlargeobj * sizeof(*h->large_offsets));
300 remain -= p->nlargeobj * sizeof(*h->large_offsets);
301 offset += p->nlargeobj * sizeof(*h->large_offsets);
304 if (remain < sizeof(*h->trailer)) {
305 err = got_error(GOT_ERR_BAD_PACKIDX);
310 (struct got_packidx_trailer *)((uint8_t*)(p->map + offset));
312 h->trailer = malloc(sizeof(*h->trailer));
313 if (h->trailer == NULL) {
314 err = got_error_from_errno("malloc");
317 n = read(p->fd, h->trailer, sizeof(*h->trailer));
319 err = got_error_from_errno("read");
320 else if (n != sizeof(*h->trailer)) {
321 err = got_error(GOT_ERR_BAD_PACKIDX);
326 SHA1Update(&ctx, h->trailer->packfile_sha1, SHA1_DIGEST_LENGTH);
327 SHA1Final(sha1, &ctx);
328 if (memcmp(h->trailer->packidx_sha1, sha1,
329 SHA1_DIGEST_LENGTH) != 0)
330 err = got_error(GOT_ERR_PACKIDX_CSUM);
336 const struct got_error *
337 got_packidx_open(struct got_packidx **packidx,
338 int dir_fd, const char *relpath, int verify)
340 const struct got_error *err = NULL;
341 struct got_packidx *p = NULL;
343 struct stat idx_sb, pack_sb;
347 err = got_packidx_get_packfile_path(&pack_relpath, relpath);
352 * Ensure that a corresponding pack file exists.
353 * Some Git repositories have this problem. Git seems to ignore
354 * the existence of lonely pack index files but we do not.
356 if (fstatat(dir_fd, pack_relpath, &pack_sb, 0) == -1) {
357 if (errno == ENOENT) {
358 err = got_error_fmt(GOT_ERR_LONELY_PACKIDX,
361 err = got_error_from_errno2("fstatat", pack_relpath);
365 p = calloc(1, sizeof(*p));
367 err = got_error_from_errno("calloc");
371 p->fd = openat(dir_fd, relpath, O_RDONLY | O_NOFOLLOW | O_CLOEXEC);
373 err = got_error_from_errno2("openat", relpath);
377 if (fstat(p->fd, &idx_sb) != 0) {
378 err = got_error_from_errno2("fstat", relpath);
381 p->len = idx_sb.st_size;
382 if (p->len < sizeof(p->hdr)) {
383 err = got_error(GOT_ERR_BAD_PACKIDX);
387 p->path_packidx = strdup(relpath);
388 if (p->path_packidx == NULL) {
389 err = got_error_from_errno("strdup");
393 #ifndef GOT_PACK_NO_MMAP
394 p->map = mmap(NULL, p->len, PROT_READ, MAP_PRIVATE, p->fd, 0);
395 if (p->map == MAP_FAILED) {
396 if (errno != ENOMEM) {
397 err = got_error_from_errno("mmap");
400 p->map = NULL; /* fall back to read(2) */
404 err = got_packidx_init_hdr(p, verify, pack_sb.st_size);
408 got_packidx_close(p);
415 const struct got_error *
416 got_packidx_close(struct got_packidx *packidx)
418 const struct got_error *err = NULL;
420 free(packidx->path_packidx);
422 if (munmap(packidx->map, packidx->len) == -1)
423 err = got_error_from_errno("munmap");
425 free(packidx->hdr.magic);
426 free(packidx->hdr.version);
427 free(packidx->hdr.fanout_table);
428 free(packidx->hdr.sorted_ids);
429 free(packidx->hdr.crc32);
430 free(packidx->hdr.offsets);
431 free(packidx->hdr.large_offsets);
432 free(packidx->hdr.trailer);
434 if (close(packidx->fd) == -1 && err == NULL)
435 err = got_error_from_errno("close");
441 const struct got_error *
442 got_packidx_get_packfile_path(char **path_packfile, const char *path_packidx)
446 /* Packfile path contains ".pack" instead of ".idx", so add one byte. */
447 size = strlen(path_packidx) + 2;
448 if (size < GOT_PACKFILE_NAMELEN + 1)
449 return got_error_path(path_packidx, GOT_ERR_BAD_PATH);
451 *path_packfile = malloc(size);
452 if (*path_packfile == NULL)
453 return got_error_from_errno("malloc");
455 /* Copy up to and excluding ".idx". */
456 if (strlcpy(*path_packfile, path_packidx,
457 size - strlen(GOT_PACKIDX_SUFFIX) - 1) >= size)
458 return got_error(GOT_ERR_NO_SPACE);
460 if (strlcat(*path_packfile, GOT_PACKFILE_SUFFIX, size) >= size)
461 return got_error(GOT_ERR_NO_SPACE);
467 got_packidx_get_object_offset(struct got_packidx *packidx, int idx)
469 uint32_t offset = be32toh(packidx->hdr.offsets[idx]);
470 if (offset & GOT_PACKIDX_OFFSET_VAL_IS_LARGE_IDX) {
472 idx = offset & GOT_PACKIDX_OFFSET_VAL_MASK;
473 if (idx < 0 || idx >= packidx->nlargeobj ||
474 packidx->hdr.large_offsets == NULL)
476 loffset = be64toh(packidx->hdr.large_offsets[idx]);
477 return (loffset > INT64_MAX ? -1 : (off_t)loffset);
479 return (off_t)(offset & GOT_PACKIDX_OFFSET_VAL_MASK);
483 got_packidx_get_object_idx(struct got_packidx *packidx,
484 struct got_object_id *id)
486 u_int8_t id0 = id->sha1[0];
487 uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
488 int left = 0, right = totobj - 1;
491 left = be32toh(packidx->hdr.fanout_table[id0 - 1]);
493 while (left <= right) {
494 struct got_packidx_object_id *oid;
497 i = ((left + right) / 2);
498 oid = &packidx->hdr.sorted_ids[i];
499 cmp = memcmp(id->sha1, oid->sha1, SHA1_DIGEST_LENGTH);
511 const struct got_error *
512 got_packidx_match_id_str_prefix(struct got_object_id_queue *matched_ids,
513 struct got_packidx *packidx, const char *id_str_prefix)
515 const struct got_error *err = NULL;
517 uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
519 size_t prefix_len = strlen(id_str_prefix);
520 struct got_packidx_object_id *oid;
523 STAILQ_INIT(matched_ids);
526 return got_error_path(id_str_prefix, GOT_ERR_BAD_OBJ_ID_STR);
528 hex[0] = id_str_prefix[0];
529 hex[1] = id_str_prefix[1];
531 if (!got_parse_xdigit(&id0, hex))
532 return got_error_path(id_str_prefix, GOT_ERR_BAD_OBJ_ID_STR);
535 i = be32toh(packidx->hdr.fanout_table[id0 - 1]);
536 oid = &packidx->hdr.sorted_ids[i];
537 while (i < totobj && oid->sha1[0] == id0) {
538 char id_str[SHA1_DIGEST_STRING_LENGTH];
539 struct got_object_qid *qid;
542 if (!got_sha1_digest_to_str(oid->sha1, id_str, sizeof(id_str)))
543 return got_error(GOT_ERR_NO_SPACE);
545 cmp = strncmp(id_str, id_str_prefix, prefix_len);
547 oid = &packidx->hdr.sorted_ids[++i];
552 err = got_object_qid_alloc_partial(&qid);
555 memcpy(qid->id->sha1, oid->sha1, SHA1_DIGEST_LENGTH);
556 STAILQ_INSERT_TAIL(matched_ids, qid, entry);
558 oid = &packidx->hdr.sorted_ids[++i];
562 got_object_id_queue_free(matched_ids);
566 static const struct got_error *
567 pack_stop_privsep_child(struct got_pack *pack)
569 const struct got_error *err = NULL;
571 if (pack->privsep_child == NULL)
574 err = got_privsep_send_stop(pack->privsep_child->imsg_fd);
577 err = got_privsep_wait_for_child(pack->privsep_child->pid);
578 if (close(pack->privsep_child->imsg_fd) == -1 && err == NULL)
579 err = got_error_from_errno("close");
580 imsg_clear(pack->privsep_child->ibuf);
581 free(pack->privsep_child->ibuf);
582 free(pack->privsep_child);
583 pack->privsep_child = NULL;
587 const struct got_error *
588 got_pack_close(struct got_pack *pack)
590 const struct got_error *err = NULL;
592 err = pack_stop_privsep_child(pack);
593 if (pack->map && munmap(pack->map, pack->filesize) == -1 && !err)
594 err = got_error_from_errno("munmap");
595 if (pack->fd != -1 && close(pack->fd) == -1 && err == NULL)
596 err = got_error_from_errno("close");
598 free(pack->path_packfile);
599 pack->path_packfile = NULL;
601 if (pack->delta_cache) {
602 got_delta_cache_free(pack->delta_cache);
603 pack->delta_cache = NULL;
609 const struct got_error *
610 got_pack_parse_object_type_and_size(uint8_t *type, uint64_t *size, size_t *len,
611 struct got_pack *pack, off_t offset)
621 if (offset >= pack->filesize)
622 return got_error(GOT_ERR_PACK_OFFSET);
625 mapoff = (size_t)offset;
627 if (lseek(pack->fd, offset, SEEK_SET) == -1)
628 return got_error_from_errno("lseek");
632 /* We do not support size values which don't fit in 64 bit. */
634 return got_error(GOT_ERR_NO_SPACE);
637 if (mapoff + sizeof(sizeN) >= pack->filesize)
638 return got_error(GOT_ERR_BAD_PACKFILE);
639 sizeN = *(pack->map + mapoff);
640 mapoff += sizeof(sizeN);
642 ssize_t n = read(pack->fd, &sizeN, sizeof(sizeN));
644 return got_error_from_errno("read");
645 if (n != sizeof(sizeN))
646 return got_error(GOT_ERR_BAD_PACKFILE);
648 *len += sizeof(sizeN);
651 t = (sizeN & GOT_PACK_OBJ_SIZE0_TYPE_MASK) >>
652 GOT_PACK_OBJ_SIZE0_TYPE_MASK_SHIFT;
653 s = (sizeN & GOT_PACK_OBJ_SIZE0_VAL_MASK);
655 size_t shift = 4 + 7 * (i - 1);
656 s |= ((sizeN & GOT_PACK_OBJ_SIZE_VAL_MASK) << shift);
659 } while (sizeN & GOT_PACK_OBJ_SIZE_MORE);
666 static const struct got_error *
667 open_plain_object(struct got_object **obj, struct got_object_id *id,
668 uint8_t type, off_t offset, size_t size, int idx)
670 *obj = calloc(1, sizeof(**obj));
672 return got_error_from_errno("calloc");
675 (*obj)->flags = GOT_OBJ_FLAG_PACKED;
676 (*obj)->pack_idx = idx;
679 memcpy(&(*obj)->id, id, sizeof((*obj)->id));
680 (*obj)->pack_offset = offset;
685 static const struct got_error *
686 parse_negative_offset(int64_t *offset, size_t *len, struct got_pack *pack,
697 /* We do not support offset values which don't fit in 64 bit. */
699 return got_error(GOT_ERR_NO_SPACE);
703 mapoff = (size_t)delta_offset + *len;
704 if (mapoff + sizeof(offN) >= pack->filesize)
705 return got_error(GOT_ERR_PACK_OFFSET);
706 offN = *(pack->map + mapoff);
709 n = read(pack->fd, &offN, sizeof(offN));
711 return got_error_from_errno("read");
712 if (n != sizeof(offN))
713 return got_error(GOT_ERR_BAD_PACKFILE);
715 *len += sizeof(offN);
718 o = (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
722 o += (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
725 } while (offN & GOT_PACK_OBJ_DELTA_OFF_MORE);
731 const struct got_error *
732 got_pack_parse_offset_delta(off_t *base_offset, size_t *len,
733 struct got_pack *pack, off_t offset, int tslen)
735 const struct got_error *err;
741 err = parse_negative_offset(&negoffset, &negofflen, pack,
746 /* Compute the base object's offset (must be in the same pack file). */
747 *base_offset = (offset - negoffset);
748 if (*base_offset <= 0)
749 return got_error(GOT_ERR_BAD_PACKFILE);
755 static const struct got_error *
756 read_delta_data(uint8_t **delta_buf, size_t *delta_len,
757 size_t delta_data_offset, struct got_pack *pack)
759 const struct got_error *err = NULL;
762 if (delta_data_offset >= pack->filesize)
763 return got_error(GOT_ERR_PACK_OFFSET);
764 err = got_inflate_to_mem_mmap(delta_buf, delta_len,
765 NULL, NULL, pack->map, delta_data_offset,
766 pack->filesize - delta_data_offset);
768 if (lseek(pack->fd, delta_data_offset, SEEK_SET) == -1)
769 return got_error_from_errno("lseek");
770 err = got_inflate_to_mem_fd(delta_buf, delta_len, NULL,
776 static const struct got_error *
777 add_delta(struct got_delta_chain *deltas, off_t delta_offset, size_t tslen,
778 int delta_type, size_t delta_size, size_t delta_data_offset)
780 struct got_delta *delta;
782 delta = got_delta_open(delta_offset, tslen, delta_type, delta_size,
785 return got_error_from_errno("got_delta_open");
786 /* delta is freed in got_object_close() */
788 STAILQ_INSERT_HEAD(&deltas->entries, delta, entry);
792 static const struct got_error *
793 resolve_offset_delta(struct got_delta_chain *deltas,
794 struct got_packidx *packidx, struct got_pack *pack, off_t delta_offset,
795 size_t tslen, int delta_type, size_t delta_size, unsigned int recursion)
798 const struct got_error *err;
803 off_t delta_data_offset;
806 err = got_pack_parse_offset_delta(&base_offset, &consumed, pack,
807 delta_offset, tslen);
811 delta_data_offset = delta_offset + tslen + consumed;
812 if (delta_data_offset >= pack->filesize)
813 return got_error(GOT_ERR_PACK_OFFSET);
815 if (pack->map == NULL) {
816 delta_data_offset = lseek(pack->fd, 0, SEEK_CUR);
817 if (delta_data_offset == -1)
818 return got_error_from_errno("lseek");
821 err = add_delta(deltas, delta_offset, tslen, delta_type, delta_size,
826 /* An offset delta must be in the same packfile. */
827 if (base_offset >= pack->filesize)
828 return got_error(GOT_ERR_PACK_OFFSET);
830 err = got_pack_parse_object_type_and_size(&base_type, &base_size,
831 &base_tslen, pack, base_offset);
835 return got_pack_resolve_delta_chain(deltas, packidx, pack, base_offset,
836 base_tslen, base_type, base_size, recursion - 1);
839 const struct got_error *
840 got_pack_parse_ref_delta(struct got_object_id *id,
841 struct got_pack *pack, off_t delta_offset, int tslen)
844 size_t mapoff = delta_offset + tslen;
845 if (mapoff + sizeof(*id) >= pack->filesize)
846 return got_error(GOT_ERR_PACK_OFFSET);
847 memcpy(id, pack->map + mapoff, sizeof(*id));
850 n = read(pack->fd, id, sizeof(*id));
852 return got_error_from_errno("read");
853 if (n != sizeof(*id))
854 return got_error(GOT_ERR_BAD_PACKFILE);
860 static const struct got_error *
861 resolve_ref_delta(struct got_delta_chain *deltas, struct got_packidx *packidx,
862 struct got_pack *pack, off_t delta_offset, size_t tslen, int delta_type,
863 size_t delta_size, unsigned int recursion)
865 const struct got_error *err;
866 struct got_object_id id;
872 off_t delta_data_offset;
874 if (delta_offset + tslen >= pack->filesize)
875 return got_error(GOT_ERR_PACK_OFFSET);
877 err = got_pack_parse_ref_delta(&id, pack, delta_offset, tslen);
881 delta_data_offset = delta_offset + tslen + sizeof(id);
883 delta_data_offset = lseek(pack->fd, 0, SEEK_CUR);
884 if (delta_data_offset == -1)
885 return got_error_from_errno("lseek");
888 err = add_delta(deltas, delta_offset, tslen, delta_type, delta_size,
893 /* Delta base must be in the same pack file. */
894 idx = got_packidx_get_object_idx(packidx, &id);
896 return got_error(GOT_ERR_NO_OBJ);
898 base_offset = got_packidx_get_object_offset(packidx, idx);
899 if (base_offset == (uint64_t)-1)
900 return got_error(GOT_ERR_BAD_PACKIDX);
902 if (base_offset >= pack->filesize)
903 return got_error(GOT_ERR_PACK_OFFSET);
905 err = got_pack_parse_object_type_and_size(&base_type, &base_size,
906 &base_tslen, pack, base_offset);
910 return got_pack_resolve_delta_chain(deltas, packidx, pack, base_offset,
911 base_tslen, base_type, base_size, recursion - 1);
914 const struct got_error *
915 got_pack_resolve_delta_chain(struct got_delta_chain *deltas,
916 struct got_packidx *packidx, struct got_pack *pack, off_t delta_offset,
917 size_t tslen, int delta_type, size_t delta_size, unsigned int recursion)
919 const struct got_error *err = NULL;
921 if (--recursion == 0)
922 return got_error(GOT_ERR_RECURSION);
924 switch (delta_type) {
925 case GOT_OBJ_TYPE_COMMIT:
926 case GOT_OBJ_TYPE_TREE:
927 case GOT_OBJ_TYPE_BLOB:
928 case GOT_OBJ_TYPE_TAG:
929 /* Plain types are the final delta base. Recursion ends. */
930 err = add_delta(deltas, delta_offset, tslen, delta_type,
933 case GOT_OBJ_TYPE_OFFSET_DELTA:
934 err = resolve_offset_delta(deltas, packidx, pack,
935 delta_offset, tslen, delta_type, delta_size, recursion - 1);
937 case GOT_OBJ_TYPE_REF_DELTA:
938 err = resolve_ref_delta(deltas, packidx, pack,
939 delta_offset, tslen, delta_type, delta_size, recursion - 1);
942 return got_error(GOT_ERR_OBJ_TYPE);
948 static const struct got_error *
949 open_delta_object(struct got_object **obj, struct got_packidx *packidx,
950 struct got_pack *pack, struct got_object_id *id, off_t offset,
951 size_t tslen, int delta_type, size_t delta_size, int idx)
953 const struct got_error *err = NULL;
956 *obj = calloc(1, sizeof(**obj));
958 return got_error_from_errno("calloc");
962 (*obj)->size = 0; /* Not known because deltas aren't applied yet. */
963 memcpy(&(*obj)->id, id, sizeof((*obj)->id));
964 (*obj)->pack_offset = offset + tslen;
966 STAILQ_INIT(&(*obj)->deltas.entries);
967 (*obj)->flags |= GOT_OBJ_FLAG_DELTIFIED;
968 (*obj)->flags |= GOT_OBJ_FLAG_PACKED;
969 (*obj)->pack_idx = idx;
971 err = got_pack_resolve_delta_chain(&(*obj)->deltas, packidx, pack,
972 offset, tslen, delta_type, delta_size,
973 GOT_DELTA_CHAIN_RECURSION_MAX);
977 err = got_delta_chain_get_base_type(&resolved_type, &(*obj)->deltas);
980 (*obj)->type = resolved_type;
983 got_object_close(*obj);
989 const struct got_error *
990 got_packfile_open_object(struct got_object **obj, struct got_pack *pack,
991 struct got_packidx *packidx, int idx, struct got_object_id *id)
993 const struct got_error *err = NULL;
1001 offset = got_packidx_get_object_offset(packidx, idx);
1002 if (offset == (uint64_t)-1)
1003 return got_error(GOT_ERR_BAD_PACKIDX);
1005 err = got_pack_parse_object_type_and_size(&type, &size, &tslen,
1011 case GOT_OBJ_TYPE_COMMIT:
1012 case GOT_OBJ_TYPE_TREE:
1013 case GOT_OBJ_TYPE_BLOB:
1014 case GOT_OBJ_TYPE_TAG:
1015 err = open_plain_object(obj, id, type, offset + tslen,
1018 case GOT_OBJ_TYPE_OFFSET_DELTA:
1019 case GOT_OBJ_TYPE_REF_DELTA:
1020 err = open_delta_object(obj, packidx, pack, id, offset,
1021 tslen, type, size, idx);
1024 err = got_error(GOT_ERR_OBJ_TYPE);
1031 const struct got_error *
1032 got_pack_get_delta_chain_max_size(uint64_t *max_size,
1033 struct got_delta_chain *deltas, struct got_pack *pack)
1035 struct got_delta *delta;
1036 uint64_t base_size = 0, result_size = 0;
1039 STAILQ_FOREACH(delta, &deltas->entries, entry) {
1040 /* Plain object types are the delta base. */
1041 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1042 delta->type != GOT_OBJ_TYPE_TREE &&
1043 delta->type != GOT_OBJ_TYPE_BLOB &&
1044 delta->type != GOT_OBJ_TYPE_TAG) {
1045 const struct got_error *err;
1050 got_delta_cache_get(&delta_buf, &delta_len,
1051 pack->delta_cache, delta->data_offset);
1052 if (delta_buf == NULL) {
1054 err = read_delta_data(&delta_buf, &delta_len,
1055 delta->data_offset, pack);
1058 err = got_delta_cache_add(pack->delta_cache,
1059 delta->data_offset, delta_buf, delta_len);
1062 else if (err->code != GOT_ERR_NO_SPACE) {
1067 err = got_delta_get_sizes(&base_size, &result_size,
1068 delta_buf, delta_len);
1074 base_size = delta->size;
1075 if (base_size > *max_size)
1076 *max_size = base_size;
1077 if (result_size > *max_size)
1078 *max_size = result_size;
1084 const struct got_error *
1085 got_pack_get_max_delta_object_size(uint64_t *size, struct got_object *obj,
1086 struct got_pack *pack)
1088 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0)
1089 return got_error(GOT_ERR_OBJ_TYPE);
1091 return got_pack_get_delta_chain_max_size(size, &obj->deltas, pack);
1094 const struct got_error *
1095 got_pack_dump_delta_chain_to_file(size_t *result_size,
1096 struct got_delta_chain *deltas, struct got_pack *pack, FILE *outfile,
1097 FILE *base_file, FILE *accum_file)
1099 const struct got_error *err = NULL;
1100 struct got_delta *delta;
1101 uint8_t *base_buf = NULL, *accum_buf = NULL, *delta_buf;
1102 size_t base_bufsz = 0, accum_size = 0, delta_len;
1108 if (STAILQ_EMPTY(&deltas->entries))
1109 return got_error(GOT_ERR_BAD_DELTA_CHAIN);
1111 /* We process small enough files entirely in memory for speed. */
1112 err = got_pack_get_delta_chain_max_size(&max_size, deltas, pack);
1115 if (max_size < GOT_DELTA_RESULT_SIZE_CACHED_MAX) {
1116 accum_buf = malloc(max_size);
1117 if (accum_buf == NULL)
1118 return got_error_from_errno("malloc");
1122 if (fseeko(base_file, 0L, SEEK_SET) == -1)
1123 return got_error_from_errno("fseeko");
1124 if (fseeko(accum_file, 0L, SEEK_SET) == -1)
1125 return got_error_from_errno("fseeko");
1128 /* Deltas are ordered in ascending order. */
1129 STAILQ_FOREACH(delta, &deltas->entries, entry) {
1133 off_t delta_data_offset;
1135 /* Plain object types are the delta base. */
1136 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1137 delta->type != GOT_OBJ_TYPE_TREE &&
1138 delta->type != GOT_OBJ_TYPE_BLOB &&
1139 delta->type != GOT_OBJ_TYPE_TAG) {
1140 err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1144 delta_data_offset = delta->offset + delta->tslen;
1145 if (delta_data_offset >= pack->filesize) {
1146 err = got_error(GOT_ERR_PACK_OFFSET);
1149 if (pack->map == NULL) {
1150 if (lseek(pack->fd, delta_data_offset, SEEK_SET)
1152 err = got_error_from_errno("lseek");
1158 mapoff = (size_t)delta_data_offset;
1159 err = got_inflate_to_file_mmap(
1160 &base_bufsz, NULL, NULL, pack->map,
1161 mapoff, pack->filesize - mapoff,
1164 err = got_inflate_to_file_fd(
1165 &base_bufsz, NULL, NULL, pack->fd,
1169 mapoff = (size_t)delta_data_offset;
1170 err = got_inflate_to_mem_mmap(&base_buf,
1171 &base_bufsz, NULL, NULL,
1173 pack->filesize - mapoff);
1175 err = got_inflate_to_mem_fd(&base_buf,
1176 &base_bufsz, NULL, NULL, max_size,
1187 got_delta_cache_get(&delta_buf, &delta_len,
1188 pack->delta_cache, delta->data_offset);
1189 if (delta_buf == NULL) {
1191 err = read_delta_data(&delta_buf, &delta_len,
1192 delta->data_offset, pack);
1195 err = got_delta_cache_add(pack->delta_cache,
1196 delta->data_offset, delta_buf, delta_len);
1199 else if (err->code != GOT_ERR_NO_SPACE) {
1205 err = got_delta_apply_in_mem(base_buf, base_bufsz,
1206 delta_buf, delta_len, accum_buf,
1207 &accum_size, max_size);
1210 err = got_delta_apply(base_file, delta_buf,
1212 /* Final delta application writes to output file. */
1213 ++n < deltas->nentries ? accum_file : outfile,
1221 if (n < deltas->nentries) {
1222 /* Accumulated delta becomes the new base. */
1224 uint8_t *tmp = accum_buf;
1226 * Base buffer switches roles with accumulation
1227 * buffer. Ensure it can hold the largest
1228 * result in the delta chain. The initial
1229 * allocation might have been smaller.
1231 if (base_bufsz < max_size) {
1233 p = reallocarray(base_buf, 1, max_size);
1235 err = got_error_from_errno(
1240 base_bufsz = max_size;
1242 accum_buf = base_buf;
1245 FILE *tmp = accum_file;
1246 accum_file = base_file;
1257 size_t len = fwrite(accum_buf, 1, accum_size, outfile);
1259 if (len != accum_size)
1260 err = got_ferror(outfile, GOT_ERR_IO);
1264 *result_size = accum_size;
1268 const struct got_error *
1269 got_pack_dump_delta_chain_to_mem(uint8_t **outbuf, size_t *outlen,
1270 struct got_delta_chain *deltas, struct got_pack *pack)
1272 const struct got_error *err = NULL;
1273 struct got_delta *delta;
1274 uint8_t *base_buf = NULL, *accum_buf = NULL, *delta_buf;
1275 size_t base_bufsz = 0, accum_size = 0, delta_len;
1282 if (STAILQ_EMPTY(&deltas->entries))
1283 return got_error(GOT_ERR_BAD_DELTA_CHAIN);
1285 err = got_pack_get_delta_chain_max_size(&max_size, deltas, pack);
1288 accum_buf = malloc(max_size);
1289 if (accum_buf == NULL)
1290 return got_error_from_errno("malloc");
1292 /* Deltas are ordered in ascending order. */
1293 STAILQ_FOREACH(delta, &deltas->entries, entry) {
1296 size_t delta_data_offset;
1298 /* Plain object types are the delta base. */
1299 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1300 delta->type != GOT_OBJ_TYPE_TREE &&
1301 delta->type != GOT_OBJ_TYPE_BLOB &&
1302 delta->type != GOT_OBJ_TYPE_TAG) {
1303 err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1307 delta_data_offset = delta->offset + delta->tslen;
1308 if (delta_data_offset >= pack->filesize) {
1309 err = got_error(GOT_ERR_PACK_OFFSET);
1313 size_t mapoff = (size_t)delta_data_offset;
1314 err = got_inflate_to_mem_mmap(&base_buf,
1315 &base_bufsz, NULL, NULL, pack->map,
1316 mapoff, pack->filesize - mapoff);
1318 if (lseek(pack->fd, delta_data_offset, SEEK_SET)
1320 err = got_error_from_errno("lseek");
1323 err = got_inflate_to_mem_fd(&base_buf,
1324 &base_bufsz, NULL, NULL, max_size,
1333 got_delta_cache_get(&delta_buf, &delta_len,
1334 pack->delta_cache, delta->data_offset);
1335 if (delta_buf == NULL) {
1337 err = read_delta_data(&delta_buf, &delta_len,
1338 delta->data_offset, pack);
1341 err = got_delta_cache_add(pack->delta_cache,
1342 delta->data_offset, delta_buf, delta_len);
1345 else if (err->code != GOT_ERR_NO_SPACE) {
1350 err = got_delta_apply_in_mem(base_buf, base_bufsz,
1351 delta_buf, delta_len, accum_buf,
1352 &accum_size, max_size);
1359 if (n < deltas->nentries) {
1360 /* Accumulated delta becomes the new base. */
1361 uint8_t *tmp = accum_buf;
1363 * Base buffer switches roles with accumulation buffer.
1364 * Ensure it can hold the largest result in the delta
1365 * chain. Initial allocation might have been smaller.
1367 if (base_bufsz < max_size) {
1369 p = reallocarray(base_buf, 1, max_size);
1371 err = got_error_from_errno(
1376 base_bufsz = max_size;
1378 accum_buf = base_buf;
1390 *outbuf = accum_buf;
1391 *outlen = accum_size;
1396 const struct got_error *
1397 got_packfile_extract_object(struct got_pack *pack, struct got_object *obj,
1398 FILE *outfile, FILE *base_file, FILE *accum_file)
1400 const struct got_error *err = NULL;
1402 if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
1403 return got_error(GOT_ERR_OBJ_NOT_PACKED);
1405 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0) {
1406 if (obj->pack_offset >= pack->filesize)
1407 return got_error(GOT_ERR_PACK_OFFSET);
1410 size_t mapoff = (size_t)obj->pack_offset;
1411 err = got_inflate_to_file_mmap(&obj->size, NULL, NULL,
1412 pack->map, mapoff, pack->filesize - mapoff,
1415 if (lseek(pack->fd, obj->pack_offset, SEEK_SET) == -1)
1416 return got_error_from_errno("lseek");
1417 err = got_inflate_to_file_fd(&obj->size, NULL, NULL,
1421 err = got_pack_dump_delta_chain_to_file(&obj->size,
1422 &obj->deltas, pack, outfile, base_file, accum_file);
1427 const struct got_error *
1428 got_packfile_extract_object_to_mem(uint8_t **buf, size_t *len,
1429 struct got_object *obj, struct got_pack *pack)
1431 const struct got_error *err = NULL;
1433 if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
1434 return got_error(GOT_ERR_OBJ_NOT_PACKED);
1436 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0) {
1437 if (obj->pack_offset >= pack->filesize)
1438 return got_error(GOT_ERR_PACK_OFFSET);
1440 size_t mapoff = (size_t)obj->pack_offset;
1441 err = got_inflate_to_mem_mmap(buf, len, NULL, NULL,
1442 pack->map, mapoff, pack->filesize - mapoff);
1444 if (lseek(pack->fd, obj->pack_offset, SEEK_SET) == -1)
1445 return got_error_from_errno("lseek");
1446 err = got_inflate_to_mem_fd(buf, len, NULL, NULL,
1447 obj->size, pack->fd);
1450 err = got_pack_dump_delta_chain_to_mem(buf, len, &obj->deltas,