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");
436 free(packidx->sorted_offsets);
437 free(packidx->sorted_large_offsets);
443 const struct got_error *
444 got_packidx_get_packfile_path(char **path_packfile, const char *path_packidx)
448 /* Packfile path contains ".pack" instead of ".idx", so add one byte. */
449 size = strlen(path_packidx) + 2;
450 if (size < GOT_PACKFILE_NAMELEN + 1)
451 return got_error_path(path_packidx, GOT_ERR_BAD_PATH);
453 *path_packfile = malloc(size);
454 if (*path_packfile == NULL)
455 return got_error_from_errno("malloc");
457 /* Copy up to and excluding ".idx". */
458 if (strlcpy(*path_packfile, path_packidx,
459 size - strlen(GOT_PACKIDX_SUFFIX) - 1) >= size)
460 return got_error(GOT_ERR_NO_SPACE);
462 if (strlcat(*path_packfile, GOT_PACKFILE_SUFFIX, size) >= size)
463 return got_error(GOT_ERR_NO_SPACE);
469 got_packidx_get_object_offset(struct got_packidx *packidx, int idx)
471 uint32_t offset = be32toh(packidx->hdr.offsets[idx]);
472 if (offset & GOT_PACKIDX_OFFSET_VAL_IS_LARGE_IDX) {
474 idx = offset & GOT_PACKIDX_OFFSET_VAL_MASK;
475 if (idx < 0 || idx >= packidx->nlargeobj ||
476 packidx->hdr.large_offsets == NULL)
478 loffset = be64toh(packidx->hdr.large_offsets[idx]);
479 return (loffset > INT64_MAX ? -1 : (off_t)loffset);
481 return (off_t)(offset & GOT_PACKIDX_OFFSET_VAL_MASK);
485 got_packidx_get_object_idx(struct got_packidx *packidx,
486 struct got_object_id *id)
488 u_int8_t id0 = id->sha1[0];
489 uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
490 int left = 0, right = totobj - 1;
493 left = be32toh(packidx->hdr.fanout_table[id0 - 1]);
495 while (left <= right) {
496 struct got_packidx_object_id *oid;
499 i = ((left + right) / 2);
500 oid = &packidx->hdr.sorted_ids[i];
501 cmp = memcmp(id->sha1, oid->sha1, SHA1_DIGEST_LENGTH);
514 offset_cmp(const void *pa, const void *pb)
516 const struct got_pack_offset_index *a, *b;
518 a = (const struct got_pack_offset_index *)pa;
519 b = (const struct got_pack_offset_index *)pb;
521 if (a->offset < b->offset)
523 else if (a->offset > b->offset)
530 large_offset_cmp(const void *pa, const void *pb)
532 const struct got_pack_large_offset_index *a, *b;
534 a = (const struct got_pack_large_offset_index *)pa;
535 b = (const struct got_pack_large_offset_index *)pb;
537 if (a->offset < b->offset)
539 else if (a->offset > b->offset)
545 static const struct got_error *
546 build_offset_index(struct got_packidx *p)
548 uint32_t nobj = be32toh(p->hdr.fanout_table[0xff]);
549 unsigned int i, j, k;
551 p->sorted_offsets = calloc(nobj - p->nlargeobj,
552 sizeof(p->sorted_offsets[0]));
553 if (p->sorted_offsets == NULL)
554 return got_error_from_errno("calloc");
556 if (p->nlargeobj > 0) {
557 p->sorted_large_offsets = calloc(p->nlargeobj,
558 sizeof(p->sorted_large_offsets[0]));
559 if (p->sorted_large_offsets == NULL)
560 return got_error_from_errno("calloc");
565 for (i = 0; i < nobj; i++) {
566 uint32_t offset = be32toh(p->hdr.offsets[i]);
567 if (offset & GOT_PACKIDX_OFFSET_VAL_IS_LARGE_IDX) {
570 idx = offset & GOT_PACKIDX_OFFSET_VAL_MASK;
571 if (idx >= p->nlargeobj ||
573 p->hdr.large_offsets == NULL)
574 return got_error(GOT_ERR_BAD_PACKIDX);
575 loffset = be64toh(p->hdr.large_offsets[idx]);
576 p->sorted_large_offsets[j].offset = loffset;
577 p->sorted_large_offsets[j].idx = i;
580 p->sorted_offsets[k].offset = offset;
581 p->sorted_offsets[k].idx = i;
585 if (j != p->nlargeobj || k != nobj - p->nlargeobj)
586 return got_error(GOT_ERR_BAD_PACKIDX);
588 qsort(p->sorted_offsets, nobj - p->nlargeobj,
589 sizeof(p->sorted_offsets[0]), offset_cmp);
591 if (p->sorted_large_offsets)
592 qsort(p->sorted_large_offsets, p->nlargeobj,
593 sizeof(p->sorted_large_offsets[0]), large_offset_cmp);
598 const struct got_error *
599 got_packidx_get_offset_idx(int *idx, struct got_packidx *packidx, off_t offset)
601 const struct got_error *err;
602 uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
607 if (packidx->sorted_offsets == NULL) {
608 err = build_offset_index(packidx);
613 if (offset >= 0x7fffffff) {
615 left = 0, right = packidx->nlargeobj - 1;
616 while (left <= right) {
617 i = ((left + right) / 2);
618 lo = packidx->sorted_large_offsets[i].offset;
620 *idx = packidx->sorted_large_offsets[i].idx;
622 } else if (offset > lo)
624 else if (offset < lo)
629 left = 0, right = totobj - packidx->nlargeobj - 1;
630 while (left <= right) {
631 i = ((left + right) / 2);
632 o = packidx->sorted_offsets[i].offset;
634 *idx = packidx->sorted_offsets[i].idx;
636 } else if (offset > o)
646 const struct got_error *
647 got_packidx_get_object_id(struct got_object_id *id,
648 struct got_packidx *packidx, int idx)
650 uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
651 struct got_packidx_object_id *oid;
653 if (idx < 0 || idx >= totobj)
654 return got_error(GOT_ERR_NO_OBJ);
656 oid = &packidx->hdr.sorted_ids[idx];
657 memcpy(id->sha1, oid->sha1, SHA1_DIGEST_LENGTH);
661 const struct got_error *
662 got_packidx_match_id_str_prefix(struct got_object_id_queue *matched_ids,
663 struct got_packidx *packidx, const char *id_str_prefix)
665 const struct got_error *err = NULL;
667 uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
669 size_t prefix_len = strlen(id_str_prefix);
670 struct got_packidx_object_id *oid;
673 STAILQ_INIT(matched_ids);
676 return got_error_path(id_str_prefix, GOT_ERR_BAD_OBJ_ID_STR);
678 hex[0] = id_str_prefix[0];
679 hex[1] = id_str_prefix[1];
681 if (!got_parse_xdigit(&id0, hex))
682 return got_error_path(id_str_prefix, GOT_ERR_BAD_OBJ_ID_STR);
685 i = be32toh(packidx->hdr.fanout_table[id0 - 1]);
686 oid = &packidx->hdr.sorted_ids[i];
687 while (i < totobj && oid->sha1[0] == id0) {
688 char id_str[SHA1_DIGEST_STRING_LENGTH];
689 struct got_object_qid *qid;
692 if (!got_sha1_digest_to_str(oid->sha1, id_str, sizeof(id_str)))
693 return got_error(GOT_ERR_NO_SPACE);
695 cmp = strncmp(id_str, id_str_prefix, prefix_len);
697 oid = &packidx->hdr.sorted_ids[++i];
702 err = got_object_qid_alloc_partial(&qid);
705 memcpy(qid->id->sha1, oid->sha1, SHA1_DIGEST_LENGTH);
706 STAILQ_INSERT_TAIL(matched_ids, qid, entry);
708 oid = &packidx->hdr.sorted_ids[++i];
712 got_object_id_queue_free(matched_ids);
716 static const struct got_error *
717 pack_stop_privsep_child(struct got_pack *pack)
719 const struct got_error *err = NULL;
721 if (pack->privsep_child == NULL)
724 err = got_privsep_send_stop(pack->privsep_child->imsg_fd);
727 err = got_privsep_wait_for_child(pack->privsep_child->pid);
728 if (close(pack->privsep_child->imsg_fd) == -1 && err == NULL)
729 err = got_error_from_errno("close");
730 free(pack->privsep_child->ibuf);
731 free(pack->privsep_child);
732 pack->privsep_child = NULL;
736 const struct got_error *
737 got_pack_close(struct got_pack *pack)
739 const struct got_error *err = NULL;
741 err = pack_stop_privsep_child(pack);
742 if (pack->map && munmap(pack->map, pack->filesize) == -1 && !err)
743 err = got_error_from_errno("munmap");
744 if (pack->fd != -1 && close(pack->fd) == -1 && err == NULL)
745 err = got_error_from_errno("close");
747 free(pack->path_packfile);
748 pack->path_packfile = NULL;
750 if (pack->delta_cache) {
751 got_delta_cache_free(pack->delta_cache);
752 pack->delta_cache = NULL;
758 const struct got_error *
759 got_pack_parse_object_type_and_size(uint8_t *type, uint64_t *size, size_t *len,
760 struct got_pack *pack, off_t offset)
770 if (offset >= pack->filesize)
771 return got_error(GOT_ERR_PACK_OFFSET);
774 mapoff = (size_t)offset;
776 if (lseek(pack->fd, offset, SEEK_SET) == -1)
777 return got_error_from_errno("lseek");
781 /* We do not support size values which don't fit in 64 bit. */
783 return got_error(GOT_ERR_NO_SPACE);
786 if (mapoff + sizeof(sizeN) >= pack->filesize)
787 return got_error(GOT_ERR_BAD_PACKFILE);
788 sizeN = *(pack->map + mapoff);
789 mapoff += sizeof(sizeN);
791 ssize_t n = read(pack->fd, &sizeN, sizeof(sizeN));
793 return got_error_from_errno("read");
794 if (n != sizeof(sizeN))
795 return got_error(GOT_ERR_BAD_PACKFILE);
797 *len += sizeof(sizeN);
800 t = (sizeN & GOT_PACK_OBJ_SIZE0_TYPE_MASK) >>
801 GOT_PACK_OBJ_SIZE0_TYPE_MASK_SHIFT;
802 s = (sizeN & GOT_PACK_OBJ_SIZE0_VAL_MASK);
804 size_t shift = 4 + 7 * (i - 1);
805 s |= ((sizeN & GOT_PACK_OBJ_SIZE_VAL_MASK) << shift);
808 } while (sizeN & GOT_PACK_OBJ_SIZE_MORE);
815 static const struct got_error *
816 open_plain_object(struct got_object **obj, struct got_object_id *id,
817 uint8_t type, off_t offset, size_t size, int idx)
819 *obj = calloc(1, sizeof(**obj));
821 return got_error_from_errno("calloc");
824 (*obj)->flags = GOT_OBJ_FLAG_PACKED;
825 (*obj)->pack_idx = idx;
828 memcpy(&(*obj)->id, id, sizeof((*obj)->id));
829 (*obj)->pack_offset = offset;
834 static const struct got_error *
835 parse_negative_offset(int64_t *offset, size_t *len, struct got_pack *pack,
846 /* We do not support offset values which don't fit in 64 bit. */
848 return got_error(GOT_ERR_NO_SPACE);
852 mapoff = (size_t)delta_offset + *len;
853 if (mapoff + sizeof(offN) >= pack->filesize)
854 return got_error(GOT_ERR_PACK_OFFSET);
855 offN = *(pack->map + mapoff);
858 n = read(pack->fd, &offN, sizeof(offN));
860 return got_error_from_errno("read");
861 if (n != sizeof(offN))
862 return got_error(GOT_ERR_BAD_PACKFILE);
864 *len += sizeof(offN);
867 o = (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
871 o += (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
874 } while (offN & GOT_PACK_OBJ_DELTA_OFF_MORE);
880 const struct got_error *
881 got_pack_parse_offset_delta(off_t *base_offset, size_t *len,
882 struct got_pack *pack, off_t offset, int tslen)
884 const struct got_error *err;
890 err = parse_negative_offset(&negoffset, &negofflen, pack,
895 /* Compute the base object's offset (must be in the same pack file). */
896 *base_offset = (offset - negoffset);
897 if (*base_offset <= 0)
898 return got_error(GOT_ERR_BAD_PACKFILE);
904 static const struct got_error *
905 read_delta_data(uint8_t **delta_buf, size_t *delta_len,
906 size_t delta_data_offset, struct got_pack *pack)
908 const struct got_error *err = NULL;
911 if (delta_data_offset >= pack->filesize)
912 return got_error(GOT_ERR_PACK_OFFSET);
913 err = got_inflate_to_mem_mmap(delta_buf, delta_len,
914 NULL, NULL, pack->map, delta_data_offset,
915 pack->filesize - delta_data_offset);
917 if (lseek(pack->fd, delta_data_offset, SEEK_SET) == -1)
918 return got_error_from_errno("lseek");
919 err = got_inflate_to_mem_fd(delta_buf, delta_len, NULL,
925 static const struct got_error *
926 add_delta(struct got_delta_chain *deltas, off_t delta_offset, size_t tslen,
927 int delta_type, size_t delta_size, size_t delta_data_offset)
929 struct got_delta *delta;
931 delta = got_delta_open(delta_offset, tslen, delta_type, delta_size,
934 return got_error_from_errno("got_delta_open");
935 /* delta is freed in got_object_close() */
937 STAILQ_INSERT_HEAD(&deltas->entries, delta, entry);
941 static const struct got_error *
942 resolve_offset_delta(struct got_delta_chain *deltas,
943 struct got_packidx *packidx, struct got_pack *pack, off_t delta_offset,
944 size_t tslen, int delta_type, size_t delta_size, unsigned int recursion)
947 const struct got_error *err;
952 off_t delta_data_offset;
955 err = got_pack_parse_offset_delta(&base_offset, &consumed, pack,
956 delta_offset, tslen);
960 delta_data_offset = delta_offset + tslen + consumed;
961 if (delta_data_offset >= pack->filesize)
962 return got_error(GOT_ERR_PACK_OFFSET);
964 if (pack->map == NULL) {
965 delta_data_offset = lseek(pack->fd, 0, SEEK_CUR);
966 if (delta_data_offset == -1)
967 return got_error_from_errno("lseek");
970 err = add_delta(deltas, delta_offset, tslen, delta_type, delta_size,
975 /* An offset delta must be in the same packfile. */
976 if (base_offset >= pack->filesize)
977 return got_error(GOT_ERR_PACK_OFFSET);
979 err = got_pack_parse_object_type_and_size(&base_type, &base_size,
980 &base_tslen, pack, base_offset);
984 return got_pack_resolve_delta_chain(deltas, packidx, pack, base_offset,
985 base_tslen, base_type, base_size, recursion - 1);
988 const struct got_error *
989 got_pack_parse_ref_delta(struct got_object_id *id,
990 struct got_pack *pack, off_t delta_offset, int tslen)
993 size_t mapoff = delta_offset + tslen;
994 if (mapoff + sizeof(*id) >= pack->filesize)
995 return got_error(GOT_ERR_PACK_OFFSET);
996 memcpy(id, pack->map + mapoff, sizeof(*id));
999 n = read(pack->fd, id, sizeof(*id));
1001 return got_error_from_errno("read");
1002 if (n != sizeof(*id))
1003 return got_error(GOT_ERR_BAD_PACKFILE);
1009 static const struct got_error *
1010 resolve_ref_delta(struct got_delta_chain *deltas, struct got_packidx *packidx,
1011 struct got_pack *pack, off_t delta_offset, size_t tslen, int delta_type,
1012 size_t delta_size, unsigned int recursion)
1014 const struct got_error *err;
1015 struct got_object_id id;
1021 off_t delta_data_offset;
1023 if (delta_offset + tslen >= pack->filesize)
1024 return got_error(GOT_ERR_PACK_OFFSET);
1026 err = got_pack_parse_ref_delta(&id, pack, delta_offset, tslen);
1030 delta_data_offset = delta_offset + tslen + sizeof(id);
1032 delta_data_offset = lseek(pack->fd, 0, SEEK_CUR);
1033 if (delta_data_offset == -1)
1034 return got_error_from_errno("lseek");
1037 err = add_delta(deltas, delta_offset, tslen, delta_type, delta_size,
1042 /* Delta base must be in the same pack file. */
1043 idx = got_packidx_get_object_idx(packidx, &id);
1045 return got_error(GOT_ERR_NO_OBJ);
1047 base_offset = got_packidx_get_object_offset(packidx, idx);
1048 if (base_offset == (uint64_t)-1)
1049 return got_error(GOT_ERR_BAD_PACKIDX);
1051 if (base_offset >= pack->filesize)
1052 return got_error(GOT_ERR_PACK_OFFSET);
1054 err = got_pack_parse_object_type_and_size(&base_type, &base_size,
1055 &base_tslen, pack, base_offset);
1059 return got_pack_resolve_delta_chain(deltas, packidx, pack, base_offset,
1060 base_tslen, base_type, base_size, recursion - 1);
1063 const struct got_error *
1064 got_pack_resolve_delta_chain(struct got_delta_chain *deltas,
1065 struct got_packidx *packidx, struct got_pack *pack, off_t delta_offset,
1066 size_t tslen, int delta_type, size_t delta_size, unsigned int recursion)
1068 const struct got_error *err = NULL;
1070 if (--recursion == 0)
1071 return got_error(GOT_ERR_RECURSION);
1073 switch (delta_type) {
1074 case GOT_OBJ_TYPE_COMMIT:
1075 case GOT_OBJ_TYPE_TREE:
1076 case GOT_OBJ_TYPE_BLOB:
1077 case GOT_OBJ_TYPE_TAG:
1078 /* Plain types are the final delta base. Recursion ends. */
1079 err = add_delta(deltas, delta_offset, tslen, delta_type,
1082 case GOT_OBJ_TYPE_OFFSET_DELTA:
1083 err = resolve_offset_delta(deltas, packidx, pack,
1084 delta_offset, tslen, delta_type, delta_size, recursion - 1);
1086 case GOT_OBJ_TYPE_REF_DELTA:
1087 err = resolve_ref_delta(deltas, packidx, pack,
1088 delta_offset, tslen, delta_type, delta_size, recursion - 1);
1091 return got_error(GOT_ERR_OBJ_TYPE);
1097 static const struct got_error *
1098 open_delta_object(struct got_object **obj, struct got_packidx *packidx,
1099 struct got_pack *pack, struct got_object_id *id, off_t offset,
1100 size_t tslen, int delta_type, size_t delta_size, int idx)
1102 const struct got_error *err = NULL;
1105 *obj = calloc(1, sizeof(**obj));
1107 return got_error_from_errno("calloc");
1111 (*obj)->size = 0; /* Not known because deltas aren't applied yet. */
1112 memcpy(&(*obj)->id, id, sizeof((*obj)->id));
1113 (*obj)->pack_offset = offset + tslen;
1115 STAILQ_INIT(&(*obj)->deltas.entries);
1116 (*obj)->flags |= GOT_OBJ_FLAG_DELTIFIED;
1117 (*obj)->flags |= GOT_OBJ_FLAG_PACKED;
1118 (*obj)->pack_idx = idx;
1120 err = got_pack_resolve_delta_chain(&(*obj)->deltas, packidx, pack,
1121 offset, tslen, delta_type, delta_size,
1122 GOT_DELTA_CHAIN_RECURSION_MAX);
1126 err = got_delta_chain_get_base_type(&resolved_type, &(*obj)->deltas);
1129 (*obj)->type = resolved_type;
1132 got_object_close(*obj);
1138 const struct got_error *
1139 got_packfile_open_object(struct got_object **obj, struct got_pack *pack,
1140 struct got_packidx *packidx, int idx, struct got_object_id *id)
1142 const struct got_error *err = NULL;
1150 offset = got_packidx_get_object_offset(packidx, idx);
1151 if (offset == (uint64_t)-1)
1152 return got_error(GOT_ERR_BAD_PACKIDX);
1154 err = got_pack_parse_object_type_and_size(&type, &size, &tslen,
1160 case GOT_OBJ_TYPE_COMMIT:
1161 case GOT_OBJ_TYPE_TREE:
1162 case GOT_OBJ_TYPE_BLOB:
1163 case GOT_OBJ_TYPE_TAG:
1164 err = open_plain_object(obj, id, type, offset + tslen,
1167 case GOT_OBJ_TYPE_OFFSET_DELTA:
1168 case GOT_OBJ_TYPE_REF_DELTA:
1169 err = open_delta_object(obj, packidx, pack, id, offset,
1170 tslen, type, size, idx);
1173 err = got_error(GOT_ERR_OBJ_TYPE);
1180 const struct got_error *
1181 got_pack_get_delta_chain_max_size(uint64_t *max_size,
1182 struct got_delta_chain *deltas, struct got_pack *pack)
1184 struct got_delta *delta;
1185 uint64_t base_size = 0, result_size = 0;
1188 STAILQ_FOREACH(delta, &deltas->entries, entry) {
1189 /* Plain object types are the delta base. */
1190 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1191 delta->type != GOT_OBJ_TYPE_TREE &&
1192 delta->type != GOT_OBJ_TYPE_BLOB &&
1193 delta->type != GOT_OBJ_TYPE_TAG) {
1194 const struct got_error *err;
1199 got_delta_cache_get(&delta_buf, &delta_len,
1200 pack->delta_cache, delta->data_offset);
1201 if (delta_buf == NULL) {
1203 err = read_delta_data(&delta_buf, &delta_len,
1204 delta->data_offset, pack);
1207 err = got_delta_cache_add(pack->delta_cache,
1208 delta->data_offset, delta_buf, delta_len);
1211 else if (err->code != GOT_ERR_NO_SPACE) {
1216 err = got_delta_get_sizes(&base_size, &result_size,
1217 delta_buf, delta_len);
1223 base_size = delta->size;
1224 if (base_size > *max_size)
1225 *max_size = base_size;
1226 if (result_size > *max_size)
1227 *max_size = result_size;
1233 const struct got_error *
1234 got_pack_get_max_delta_object_size(uint64_t *size, struct got_object *obj,
1235 struct got_pack *pack)
1237 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0)
1238 return got_error(GOT_ERR_OBJ_TYPE);
1240 return got_pack_get_delta_chain_max_size(size, &obj->deltas, pack);
1243 const struct got_error *
1244 got_pack_dump_delta_chain_to_file(size_t *result_size,
1245 struct got_delta_chain *deltas, struct got_pack *pack, FILE *outfile,
1246 FILE *base_file, FILE *accum_file)
1248 const struct got_error *err = NULL;
1249 struct got_delta *delta;
1250 uint8_t *base_buf = NULL, *accum_buf = NULL, *delta_buf;
1251 size_t base_bufsz = 0, accum_size = 0, delta_len;
1257 if (STAILQ_EMPTY(&deltas->entries))
1258 return got_error(GOT_ERR_BAD_DELTA_CHAIN);
1260 /* We process small enough files entirely in memory for speed. */
1261 err = got_pack_get_delta_chain_max_size(&max_size, deltas, pack);
1264 if (max_size < GOT_DELTA_RESULT_SIZE_CACHED_MAX) {
1265 accum_buf = malloc(max_size);
1266 if (accum_buf == NULL)
1267 return got_error_from_errno("malloc");
1271 if (fseeko(base_file, 0L, SEEK_SET) == -1)
1272 return got_error_from_errno("fseeko");
1273 if (fseeko(accum_file, 0L, SEEK_SET) == -1)
1274 return got_error_from_errno("fseeko");
1277 /* Deltas are ordered in ascending order. */
1278 STAILQ_FOREACH(delta, &deltas->entries, entry) {
1282 off_t delta_data_offset;
1284 /* Plain object types are the delta base. */
1285 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1286 delta->type != GOT_OBJ_TYPE_TREE &&
1287 delta->type != GOT_OBJ_TYPE_BLOB &&
1288 delta->type != GOT_OBJ_TYPE_TAG) {
1289 err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1293 delta_data_offset = delta->offset + delta->tslen;
1294 if (delta_data_offset >= pack->filesize) {
1295 err = got_error(GOT_ERR_PACK_OFFSET);
1298 if (pack->map == NULL) {
1299 if (lseek(pack->fd, delta_data_offset, SEEK_SET)
1301 err = got_error_from_errno("lseek");
1307 mapoff = (size_t)delta_data_offset;
1308 err = got_inflate_to_file_mmap(
1309 &base_bufsz, NULL, NULL, pack->map,
1310 mapoff, pack->filesize - mapoff,
1313 err = got_inflate_to_file_fd(
1314 &base_bufsz, NULL, NULL, pack->fd,
1318 mapoff = (size_t)delta_data_offset;
1319 err = got_inflate_to_mem_mmap(&base_buf,
1320 &base_bufsz, NULL, NULL,
1322 pack->filesize - mapoff);
1324 err = got_inflate_to_mem_fd(&base_buf,
1325 &base_bufsz, NULL, NULL, max_size,
1336 got_delta_cache_get(&delta_buf, &delta_len,
1337 pack->delta_cache, delta->data_offset);
1338 if (delta_buf == NULL) {
1340 err = read_delta_data(&delta_buf, &delta_len,
1341 delta->data_offset, pack);
1344 err = got_delta_cache_add(pack->delta_cache,
1345 delta->data_offset, delta_buf, delta_len);
1348 else if (err->code != GOT_ERR_NO_SPACE) {
1354 err = got_delta_apply_in_mem(base_buf, base_bufsz,
1355 delta_buf, delta_len, accum_buf,
1356 &accum_size, max_size);
1359 err = got_delta_apply(base_file, delta_buf,
1361 /* Final delta application writes to output file. */
1362 ++n < deltas->nentries ? accum_file : outfile,
1370 if (n < deltas->nentries) {
1371 /* Accumulated delta becomes the new base. */
1373 uint8_t *tmp = accum_buf;
1375 * Base buffer switches roles with accumulation
1376 * buffer. Ensure it can hold the largest
1377 * result in the delta chain. The initial
1378 * allocation might have been smaller.
1380 if (base_bufsz < max_size) {
1382 p = reallocarray(base_buf, 1, max_size);
1384 err = got_error_from_errno(
1389 base_bufsz = max_size;
1391 accum_buf = base_buf;
1394 FILE *tmp = accum_file;
1395 accum_file = base_file;
1406 size_t len = fwrite(accum_buf, 1, accum_size, outfile);
1408 if (len != accum_size)
1409 err = got_ferror(outfile, GOT_ERR_IO);
1413 *result_size = accum_size;
1417 const struct got_error *
1418 got_pack_dump_delta_chain_to_mem(uint8_t **outbuf, size_t *outlen,
1419 struct got_delta_chain *deltas, struct got_pack *pack)
1421 const struct got_error *err = NULL;
1422 struct got_delta *delta;
1423 uint8_t *base_buf = NULL, *accum_buf = NULL, *delta_buf;
1424 size_t base_bufsz = 0, accum_size = 0, delta_len;
1431 if (STAILQ_EMPTY(&deltas->entries))
1432 return got_error(GOT_ERR_BAD_DELTA_CHAIN);
1434 err = got_pack_get_delta_chain_max_size(&max_size, deltas, pack);
1437 accum_buf = malloc(max_size);
1438 if (accum_buf == NULL)
1439 return got_error_from_errno("malloc");
1441 /* Deltas are ordered in ascending order. */
1442 STAILQ_FOREACH(delta, &deltas->entries, entry) {
1445 size_t delta_data_offset;
1447 /* Plain object types are the delta base. */
1448 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1449 delta->type != GOT_OBJ_TYPE_TREE &&
1450 delta->type != GOT_OBJ_TYPE_BLOB &&
1451 delta->type != GOT_OBJ_TYPE_TAG) {
1452 err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1456 delta_data_offset = delta->offset + delta->tslen;
1457 if (delta_data_offset >= pack->filesize) {
1458 err = got_error(GOT_ERR_PACK_OFFSET);
1462 size_t mapoff = (size_t)delta_data_offset;
1463 err = got_inflate_to_mem_mmap(&base_buf,
1464 &base_bufsz, NULL, NULL, pack->map,
1465 mapoff, pack->filesize - mapoff);
1467 if (lseek(pack->fd, delta_data_offset, SEEK_SET)
1469 err = got_error_from_errno("lseek");
1472 err = got_inflate_to_mem_fd(&base_buf,
1473 &base_bufsz, NULL, NULL, max_size,
1482 got_delta_cache_get(&delta_buf, &delta_len,
1483 pack->delta_cache, delta->data_offset);
1484 if (delta_buf == NULL) {
1486 err = read_delta_data(&delta_buf, &delta_len,
1487 delta->data_offset, pack);
1490 err = got_delta_cache_add(pack->delta_cache,
1491 delta->data_offset, delta_buf, delta_len);
1494 else if (err->code != GOT_ERR_NO_SPACE) {
1499 err = got_delta_apply_in_mem(base_buf, base_bufsz,
1500 delta_buf, delta_len, accum_buf,
1501 &accum_size, max_size);
1508 if (n < deltas->nentries) {
1509 /* Accumulated delta becomes the new base. */
1510 uint8_t *tmp = accum_buf;
1512 * Base buffer switches roles with accumulation buffer.
1513 * Ensure it can hold the largest result in the delta
1514 * chain. Initial allocation might have been smaller.
1516 if (base_bufsz < max_size) {
1518 p = reallocarray(base_buf, 1, max_size);
1520 err = got_error_from_errno(
1525 base_bufsz = max_size;
1527 accum_buf = base_buf;
1539 *outbuf = accum_buf;
1540 *outlen = accum_size;
1545 const struct got_error *
1546 got_packfile_extract_object(struct got_pack *pack, struct got_object *obj,
1547 FILE *outfile, FILE *base_file, FILE *accum_file)
1549 const struct got_error *err = NULL;
1551 if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
1552 return got_error(GOT_ERR_OBJ_NOT_PACKED);
1554 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0) {
1555 if (obj->pack_offset >= pack->filesize)
1556 return got_error(GOT_ERR_PACK_OFFSET);
1559 size_t mapoff = (size_t)obj->pack_offset;
1560 err = got_inflate_to_file_mmap(&obj->size, NULL, NULL,
1561 pack->map, mapoff, pack->filesize - mapoff,
1564 if (lseek(pack->fd, obj->pack_offset, SEEK_SET) == -1)
1565 return got_error_from_errno("lseek");
1566 err = got_inflate_to_file_fd(&obj->size, NULL, NULL,
1570 err = got_pack_dump_delta_chain_to_file(&obj->size,
1571 &obj->deltas, pack, outfile, base_file, accum_file);
1576 const struct got_error *
1577 got_packfile_extract_object_to_mem(uint8_t **buf, size_t *len,
1578 struct got_object *obj, struct got_pack *pack)
1580 const struct got_error *err = NULL;
1582 if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
1583 return got_error(GOT_ERR_OBJ_NOT_PACKED);
1585 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0) {
1586 if (obj->pack_offset >= pack->filesize)
1587 return got_error(GOT_ERR_PACK_OFFSET);
1589 size_t mapoff = (size_t)obj->pack_offset;
1590 err = got_inflate_to_mem_mmap(buf, len, NULL, NULL,
1591 pack->map, mapoff, pack->filesize - mapoff);
1593 if (lseek(pack->fd, obj->pack_offset, SEEK_SET) == -1)
1594 return got_error_from_errno("lseek");
1595 err = got_inflate_to_mem_fd(buf, len, NULL, NULL,
1596 obj->size, pack->fd);
1599 err = got_pack_dump_delta_chain_to_mem(buf, len, &obj->deltas,
1605 const struct got_error *
1606 got_packfile_extract_raw_delta(uint8_t **delta_buf, size_t *delta_size,
1607 off_t *delta_offset, off_t *base_offset, struct got_object_id *base_id,
1608 uint64_t *base_size, uint64_t *result_size, struct got_pack *pack,
1609 struct got_packidx *packidx, int idx)
1611 const struct got_error *err = NULL;
1615 size_t tslen, delta_hdrlen;
1624 offset = got_packidx_get_object_offset(packidx, idx);
1625 if (offset == (uint64_t)-1)
1626 return got_error(GOT_ERR_BAD_PACKIDX);
1628 if (offset >= pack->filesize)
1629 return got_error(GOT_ERR_PACK_OFFSET);
1631 err = got_pack_parse_object_type_and_size(&type, &size, &tslen,
1636 if (tslen + size < tslen || offset + size < size ||
1637 tslen + offset < tslen)
1638 return got_error(GOT_ERR_PACK_OFFSET);
1641 case GOT_OBJ_TYPE_OFFSET_DELTA:
1642 err = got_pack_parse_offset_delta(base_offset, &delta_hdrlen,
1643 pack, offset, tslen);
1647 case GOT_OBJ_TYPE_REF_DELTA:
1648 err = got_pack_parse_ref_delta(base_id, pack, offset, tslen);
1651 delta_hdrlen = SHA1_DIGEST_LENGTH;
1654 return got_error_fmt(GOT_ERR_OBJ_TYPE,
1655 "non-delta object type %d found at offset %llu",
1659 if (tslen + delta_hdrlen < delta_hdrlen ||
1660 offset + delta_hdrlen < delta_hdrlen)
1661 return got_error(GOT_ERR_BAD_DELTA);
1663 err = read_delta_data(delta_buf, delta_size,
1664 offset + tslen + delta_hdrlen, pack);
1668 if (*delta_size != size) {
1669 err = got_error(GOT_ERR_BAD_DELTA);
1673 err = got_delta_get_sizes(base_size, result_size, *delta_buf, size);
1677 *delta_offset = offset;