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");
432 free(packidx->sorted_offsets);
433 free(packidx->sorted_large_offsets);
439 const struct got_error *
440 got_packidx_get_packfile_path(char **path_packfile, const char *path_packidx)
444 /* Packfile path contains ".pack" instead of ".idx", so add one byte. */
445 size = strlen(path_packidx) + 2;
446 if (size < GOT_PACKFILE_NAMELEN + 1)
447 return got_error_path(path_packidx, GOT_ERR_BAD_PATH);
449 *path_packfile = malloc(size);
450 if (*path_packfile == NULL)
451 return got_error_from_errno("malloc");
453 /* Copy up to and excluding ".idx". */
454 if (strlcpy(*path_packfile, path_packidx,
455 size - strlen(GOT_PACKIDX_SUFFIX) - 1) >= size)
456 return got_error(GOT_ERR_NO_SPACE);
458 if (strlcat(*path_packfile, GOT_PACKFILE_SUFFIX, size) >= size)
459 return got_error(GOT_ERR_NO_SPACE);
465 got_packidx_get_object_offset(struct got_packidx *packidx, int idx)
467 uint32_t offset = be32toh(packidx->hdr.offsets[idx]);
468 if (offset & GOT_PACKIDX_OFFSET_VAL_IS_LARGE_IDX) {
470 idx = offset & GOT_PACKIDX_OFFSET_VAL_MASK;
471 if (idx < 0 || idx >= packidx->nlargeobj ||
472 packidx->hdr.large_offsets == NULL)
474 loffset = be64toh(packidx->hdr.large_offsets[idx]);
475 return (loffset > INT64_MAX ? -1 : (off_t)loffset);
477 return (off_t)(offset & GOT_PACKIDX_OFFSET_VAL_MASK);
481 got_packidx_get_object_idx(struct got_packidx *packidx,
482 struct got_object_id *id)
484 u_int8_t id0 = id->sha1[0];
485 uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
486 int left = 0, right = totobj - 1;
489 left = be32toh(packidx->hdr.fanout_table[id0 - 1]);
491 while (left <= right) {
492 struct got_packidx_object_id *oid;
495 i = ((left + right) / 2);
496 oid = &packidx->hdr.sorted_ids[i];
497 cmp = memcmp(id->sha1, oid->sha1, SHA1_DIGEST_LENGTH);
510 offset_cmp(const void *pa, const void *pb)
512 const struct got_pack_offset_index *a, *b;
514 a = (const struct got_pack_offset_index *)pa;
515 b = (const struct got_pack_offset_index *)pb;
517 if (a->offset < b->offset)
519 else if (a->offset > b->offset)
526 large_offset_cmp(const void *pa, const void *pb)
528 const struct got_pack_large_offset_index *a, *b;
530 a = (const struct got_pack_large_offset_index *)pa;
531 b = (const struct got_pack_large_offset_index *)pb;
533 if (a->offset < b->offset)
535 else if (a->offset > b->offset)
541 static const struct got_error *
542 build_offset_index(struct got_packidx *p)
544 uint32_t nobj = be32toh(p->hdr.fanout_table[0xff]);
545 unsigned int i, j, k;
547 p->sorted_offsets = calloc(nobj - p->nlargeobj,
548 sizeof(p->sorted_offsets[0]));
549 if (p->sorted_offsets == NULL)
550 return got_error_from_errno("calloc");
552 if (p->nlargeobj > 0) {
553 p->sorted_large_offsets = calloc(p->nlargeobj,
554 sizeof(p->sorted_large_offsets[0]));
555 if (p->sorted_large_offsets == NULL)
556 return got_error_from_errno("calloc");
561 for (i = 0; i < nobj; i++) {
562 uint32_t offset = be32toh(p->hdr.offsets[i]);
563 if (offset & GOT_PACKIDX_OFFSET_VAL_IS_LARGE_IDX) {
566 idx = offset & GOT_PACKIDX_OFFSET_VAL_MASK;
567 if (idx >= p->nlargeobj ||
569 p->hdr.large_offsets == NULL)
570 return got_error(GOT_ERR_BAD_PACKIDX);
571 loffset = be64toh(p->hdr.large_offsets[idx]);
572 p->sorted_large_offsets[j].offset = loffset;
573 p->sorted_large_offsets[j].idx = i;
576 p->sorted_offsets[k].offset = offset;
577 p->sorted_offsets[k].idx = i;
581 if (j != p->nlargeobj || k != nobj - p->nlargeobj)
582 return got_error(GOT_ERR_BAD_PACKIDX);
584 qsort(p->sorted_offsets, nobj - p->nlargeobj,
585 sizeof(p->sorted_offsets[0]), offset_cmp);
587 if (p->sorted_large_offsets)
588 qsort(p->sorted_large_offsets, p->nlargeobj,
589 sizeof(p->sorted_large_offsets[0]), large_offset_cmp);
594 const struct got_error *
595 got_packidx_get_offset_idx(int *idx, struct got_packidx *packidx, off_t offset)
597 const struct got_error *err;
598 uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
603 if (packidx->sorted_offsets == NULL) {
604 err = build_offset_index(packidx);
609 if (offset >= 0x7fffffff) {
611 left = 0, right = packidx->nlargeobj - 1;
612 while (left <= right) {
613 i = ((left + right) / 2);
614 lo = packidx->sorted_large_offsets[i].offset;
616 *idx = packidx->sorted_large_offsets[i].idx;
618 } else if (offset > lo)
620 else if (offset < lo)
625 left = 0, right = totobj - packidx->nlargeobj - 1;
626 while (left <= right) {
627 i = ((left + right) / 2);
628 o = packidx->sorted_offsets[i].offset;
630 *idx = packidx->sorted_offsets[i].idx;
632 } else if (offset > o)
642 const struct got_error *
643 got_packidx_get_object_id(struct got_object_id *id,
644 struct got_packidx *packidx, int idx)
646 uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
647 struct got_packidx_object_id *oid;
649 if (idx < 0 || idx >= totobj)
650 return got_error(GOT_ERR_NO_OBJ);
652 oid = &packidx->hdr.sorted_ids[idx];
653 memcpy(id->sha1, oid->sha1, SHA1_DIGEST_LENGTH);
657 const struct got_error *
658 got_packidx_match_id_str_prefix(struct got_object_id_queue *matched_ids,
659 struct got_packidx *packidx, const char *id_str_prefix)
661 const struct got_error *err = NULL;
663 uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
665 size_t prefix_len = strlen(id_str_prefix);
666 struct got_packidx_object_id *oid;
669 STAILQ_INIT(matched_ids);
672 return got_error_path(id_str_prefix, GOT_ERR_BAD_OBJ_ID_STR);
674 hex[0] = id_str_prefix[0];
675 hex[1] = id_str_prefix[1];
677 if (!got_parse_xdigit(&id0, hex))
678 return got_error_path(id_str_prefix, GOT_ERR_BAD_OBJ_ID_STR);
681 i = be32toh(packidx->hdr.fanout_table[id0 - 1]);
682 oid = &packidx->hdr.sorted_ids[i];
683 while (i < totobj && oid->sha1[0] == id0) {
684 char id_str[SHA1_DIGEST_STRING_LENGTH];
685 struct got_object_qid *qid;
688 if (!got_sha1_digest_to_str(oid->sha1, id_str, sizeof(id_str)))
689 return got_error(GOT_ERR_NO_SPACE);
691 cmp = strncmp(id_str, id_str_prefix, prefix_len);
693 oid = &packidx->hdr.sorted_ids[++i];
698 err = got_object_qid_alloc_partial(&qid);
701 memcpy(qid->id->sha1, oid->sha1, SHA1_DIGEST_LENGTH);
702 STAILQ_INSERT_TAIL(matched_ids, qid, entry);
704 oid = &packidx->hdr.sorted_ids[++i];
708 got_object_id_queue_free(matched_ids);
712 static const struct got_error *
713 pack_stop_privsep_child(struct got_pack *pack)
715 const struct got_error *err = NULL;
717 if (pack->privsep_child == NULL)
720 err = got_privsep_send_stop(pack->privsep_child->imsg_fd);
723 err = got_privsep_wait_for_child(pack->privsep_child->pid);
724 if (close(pack->privsep_child->imsg_fd) == -1 && err == NULL)
725 err = got_error_from_errno("close");
726 free(pack->privsep_child->ibuf);
727 free(pack->privsep_child);
728 pack->privsep_child = NULL;
732 const struct got_error *
733 got_pack_close(struct got_pack *pack)
735 const struct got_error *err = NULL;
737 err = pack_stop_privsep_child(pack);
738 if (pack->map && munmap(pack->map, pack->filesize) == -1 && !err)
739 err = got_error_from_errno("munmap");
740 if (pack->fd != -1 && close(pack->fd) == -1 && err == NULL)
741 err = got_error_from_errno("close");
743 free(pack->path_packfile);
744 pack->path_packfile = NULL;
746 if (pack->delta_cache) {
747 got_delta_cache_free(pack->delta_cache);
748 pack->delta_cache = NULL;
754 const struct got_error *
755 got_pack_parse_object_type_and_size(uint8_t *type, uint64_t *size, size_t *len,
756 struct got_pack *pack, off_t offset)
766 if (offset >= pack->filesize)
767 return got_error(GOT_ERR_PACK_OFFSET);
770 mapoff = (size_t)offset;
772 if (lseek(pack->fd, offset, SEEK_SET) == -1)
773 return got_error_from_errno("lseek");
777 /* We do not support size values which don't fit in 64 bit. */
779 return got_error(GOT_ERR_NO_SPACE);
782 if (mapoff + sizeof(sizeN) >= pack->filesize)
783 return got_error(GOT_ERR_BAD_PACKFILE);
784 sizeN = *(pack->map + mapoff);
785 mapoff += sizeof(sizeN);
787 ssize_t n = read(pack->fd, &sizeN, sizeof(sizeN));
789 return got_error_from_errno("read");
790 if (n != sizeof(sizeN))
791 return got_error(GOT_ERR_BAD_PACKFILE);
793 *len += sizeof(sizeN);
796 t = (sizeN & GOT_PACK_OBJ_SIZE0_TYPE_MASK) >>
797 GOT_PACK_OBJ_SIZE0_TYPE_MASK_SHIFT;
798 s = (sizeN & GOT_PACK_OBJ_SIZE0_VAL_MASK);
800 size_t shift = 4 + 7 * (i - 1);
801 s |= ((sizeN & GOT_PACK_OBJ_SIZE_VAL_MASK) << shift);
804 } while (sizeN & GOT_PACK_OBJ_SIZE_MORE);
811 static const struct got_error *
812 open_plain_object(struct got_object **obj, struct got_object_id *id,
813 uint8_t type, off_t offset, size_t size, int idx)
815 *obj = calloc(1, sizeof(**obj));
817 return got_error_from_errno("calloc");
820 (*obj)->flags = GOT_OBJ_FLAG_PACKED;
821 (*obj)->pack_idx = idx;
824 memcpy(&(*obj)->id, id, sizeof((*obj)->id));
825 (*obj)->pack_offset = offset;
830 static const struct got_error *
831 parse_negative_offset(int64_t *offset, size_t *len, struct got_pack *pack,
842 /* We do not support offset values which don't fit in 64 bit. */
844 return got_error(GOT_ERR_NO_SPACE);
848 mapoff = (size_t)delta_offset + *len;
849 if (mapoff + sizeof(offN) >= pack->filesize)
850 return got_error(GOT_ERR_PACK_OFFSET);
851 offN = *(pack->map + mapoff);
854 n = read(pack->fd, &offN, sizeof(offN));
856 return got_error_from_errno("read");
857 if (n != sizeof(offN))
858 return got_error(GOT_ERR_BAD_PACKFILE);
860 *len += sizeof(offN);
863 o = (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
867 o += (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
870 } while (offN & GOT_PACK_OBJ_DELTA_OFF_MORE);
876 const struct got_error *
877 got_pack_parse_offset_delta(off_t *base_offset, size_t *len,
878 struct got_pack *pack, off_t offset, int tslen)
880 const struct got_error *err;
886 err = parse_negative_offset(&negoffset, &negofflen, pack,
891 /* Compute the base object's offset (must be in the same pack file). */
892 *base_offset = (offset - negoffset);
893 if (*base_offset <= 0)
894 return got_error(GOT_ERR_BAD_PACKFILE);
900 static const struct got_error *
901 read_delta_data(uint8_t **delta_buf, size_t *delta_len,
902 size_t delta_data_offset, struct got_pack *pack)
904 const struct got_error *err = NULL;
907 if (delta_data_offset >= pack->filesize)
908 return got_error(GOT_ERR_PACK_OFFSET);
909 err = got_inflate_to_mem_mmap(delta_buf, delta_len,
910 NULL, NULL, pack->map, delta_data_offset,
911 pack->filesize - delta_data_offset);
913 if (lseek(pack->fd, delta_data_offset, SEEK_SET) == -1)
914 return got_error_from_errno("lseek");
915 err = got_inflate_to_mem_fd(delta_buf, delta_len, NULL,
921 static const struct got_error *
922 add_delta(struct got_delta_chain *deltas, off_t delta_offset, size_t tslen,
923 int delta_type, size_t delta_size, size_t delta_data_offset)
925 struct got_delta *delta;
927 delta = got_delta_open(delta_offset, tslen, delta_type, delta_size,
930 return got_error_from_errno("got_delta_open");
931 /* delta is freed in got_object_close() */
933 STAILQ_INSERT_HEAD(&deltas->entries, delta, entry);
937 static const struct got_error *
938 resolve_offset_delta(struct got_delta_chain *deltas,
939 struct got_packidx *packidx, struct got_pack *pack, off_t delta_offset,
940 size_t tslen, int delta_type, size_t delta_size, unsigned int recursion)
943 const struct got_error *err;
948 off_t delta_data_offset;
951 err = got_pack_parse_offset_delta(&base_offset, &consumed, pack,
952 delta_offset, tslen);
956 delta_data_offset = delta_offset + tslen + consumed;
957 if (delta_data_offset >= pack->filesize)
958 return got_error(GOT_ERR_PACK_OFFSET);
960 if (pack->map == NULL) {
961 delta_data_offset = lseek(pack->fd, 0, SEEK_CUR);
962 if (delta_data_offset == -1)
963 return got_error_from_errno("lseek");
966 err = add_delta(deltas, delta_offset, tslen, delta_type, delta_size,
971 /* An offset delta must be in the same packfile. */
972 if (base_offset >= pack->filesize)
973 return got_error(GOT_ERR_PACK_OFFSET);
975 err = got_pack_parse_object_type_and_size(&base_type, &base_size,
976 &base_tslen, pack, base_offset);
980 return got_pack_resolve_delta_chain(deltas, packidx, pack, base_offset,
981 base_tslen, base_type, base_size, recursion - 1);
984 const struct got_error *
985 got_pack_parse_ref_delta(struct got_object_id *id,
986 struct got_pack *pack, off_t delta_offset, int tslen)
989 size_t mapoff = delta_offset + tslen;
990 if (mapoff + sizeof(*id) >= pack->filesize)
991 return got_error(GOT_ERR_PACK_OFFSET);
992 memcpy(id, pack->map + mapoff, sizeof(*id));
995 n = read(pack->fd, id, sizeof(*id));
997 return got_error_from_errno("read");
998 if (n != sizeof(*id))
999 return got_error(GOT_ERR_BAD_PACKFILE);
1005 static const struct got_error *
1006 resolve_ref_delta(struct got_delta_chain *deltas, struct got_packidx *packidx,
1007 struct got_pack *pack, off_t delta_offset, size_t tslen, int delta_type,
1008 size_t delta_size, unsigned int recursion)
1010 const struct got_error *err;
1011 struct got_object_id id;
1017 off_t delta_data_offset;
1019 if (delta_offset + tslen >= pack->filesize)
1020 return got_error(GOT_ERR_PACK_OFFSET);
1022 err = got_pack_parse_ref_delta(&id, pack, delta_offset, tslen);
1026 delta_data_offset = delta_offset + tslen + sizeof(id);
1028 delta_data_offset = lseek(pack->fd, 0, SEEK_CUR);
1029 if (delta_data_offset == -1)
1030 return got_error_from_errno("lseek");
1033 err = add_delta(deltas, delta_offset, tslen, delta_type, delta_size,
1038 /* Delta base must be in the same pack file. */
1039 idx = got_packidx_get_object_idx(packidx, &id);
1041 return got_error(GOT_ERR_NO_OBJ);
1043 base_offset = got_packidx_get_object_offset(packidx, idx);
1044 if (base_offset == (uint64_t)-1)
1045 return got_error(GOT_ERR_BAD_PACKIDX);
1047 if (base_offset >= pack->filesize)
1048 return got_error(GOT_ERR_PACK_OFFSET);
1050 err = got_pack_parse_object_type_and_size(&base_type, &base_size,
1051 &base_tslen, pack, base_offset);
1055 return got_pack_resolve_delta_chain(deltas, packidx, pack, base_offset,
1056 base_tslen, base_type, base_size, recursion - 1);
1059 const struct got_error *
1060 got_pack_resolve_delta_chain(struct got_delta_chain *deltas,
1061 struct got_packidx *packidx, struct got_pack *pack, off_t delta_offset,
1062 size_t tslen, int delta_type, size_t delta_size, unsigned int recursion)
1064 const struct got_error *err = NULL;
1066 if (--recursion == 0)
1067 return got_error(GOT_ERR_RECURSION);
1069 switch (delta_type) {
1070 case GOT_OBJ_TYPE_COMMIT:
1071 case GOT_OBJ_TYPE_TREE:
1072 case GOT_OBJ_TYPE_BLOB:
1073 case GOT_OBJ_TYPE_TAG:
1074 /* Plain types are the final delta base. Recursion ends. */
1075 err = add_delta(deltas, delta_offset, tslen, delta_type,
1078 case GOT_OBJ_TYPE_OFFSET_DELTA:
1079 err = resolve_offset_delta(deltas, packidx, pack,
1080 delta_offset, tslen, delta_type, delta_size, recursion - 1);
1082 case GOT_OBJ_TYPE_REF_DELTA:
1083 err = resolve_ref_delta(deltas, packidx, pack,
1084 delta_offset, tslen, delta_type, delta_size, recursion - 1);
1087 return got_error(GOT_ERR_OBJ_TYPE);
1093 static const struct got_error *
1094 open_delta_object(struct got_object **obj, struct got_packidx *packidx,
1095 struct got_pack *pack, struct got_object_id *id, off_t offset,
1096 size_t tslen, int delta_type, size_t delta_size, int idx)
1098 const struct got_error *err = NULL;
1101 *obj = calloc(1, sizeof(**obj));
1103 return got_error_from_errno("calloc");
1107 (*obj)->size = 0; /* Not known because deltas aren't applied yet. */
1108 memcpy(&(*obj)->id, id, sizeof((*obj)->id));
1109 (*obj)->pack_offset = offset + tslen;
1111 STAILQ_INIT(&(*obj)->deltas.entries);
1112 (*obj)->flags |= GOT_OBJ_FLAG_DELTIFIED;
1113 (*obj)->flags |= GOT_OBJ_FLAG_PACKED;
1114 (*obj)->pack_idx = idx;
1116 err = got_pack_resolve_delta_chain(&(*obj)->deltas, packidx, pack,
1117 offset, tslen, delta_type, delta_size,
1118 GOT_DELTA_CHAIN_RECURSION_MAX);
1122 err = got_delta_chain_get_base_type(&resolved_type, &(*obj)->deltas);
1125 (*obj)->type = resolved_type;
1128 got_object_close(*obj);
1134 const struct got_error *
1135 got_packfile_open_object(struct got_object **obj, struct got_pack *pack,
1136 struct got_packidx *packidx, int idx, struct got_object_id *id)
1138 const struct got_error *err = NULL;
1146 offset = got_packidx_get_object_offset(packidx, idx);
1147 if (offset == (uint64_t)-1)
1148 return got_error(GOT_ERR_BAD_PACKIDX);
1150 err = got_pack_parse_object_type_and_size(&type, &size, &tslen,
1156 case GOT_OBJ_TYPE_COMMIT:
1157 case GOT_OBJ_TYPE_TREE:
1158 case GOT_OBJ_TYPE_BLOB:
1159 case GOT_OBJ_TYPE_TAG:
1160 err = open_plain_object(obj, id, type, offset + tslen,
1163 case GOT_OBJ_TYPE_OFFSET_DELTA:
1164 case GOT_OBJ_TYPE_REF_DELTA:
1165 err = open_delta_object(obj, packidx, pack, id, offset,
1166 tslen, type, size, idx);
1169 err = got_error(GOT_ERR_OBJ_TYPE);
1176 const struct got_error *
1177 got_pack_get_delta_chain_max_size(uint64_t *max_size,
1178 struct got_delta_chain *deltas, struct got_pack *pack)
1180 struct got_delta *delta;
1181 uint64_t base_size = 0, result_size = 0;
1184 STAILQ_FOREACH(delta, &deltas->entries, entry) {
1185 /* Plain object types are the delta base. */
1186 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1187 delta->type != GOT_OBJ_TYPE_TREE &&
1188 delta->type != GOT_OBJ_TYPE_BLOB &&
1189 delta->type != GOT_OBJ_TYPE_TAG) {
1190 const struct got_error *err;
1195 got_delta_cache_get(&delta_buf, &delta_len,
1196 pack->delta_cache, delta->data_offset);
1197 if (delta_buf == NULL) {
1199 err = read_delta_data(&delta_buf, &delta_len,
1200 delta->data_offset, pack);
1203 err = got_delta_cache_add(pack->delta_cache,
1204 delta->data_offset, delta_buf, delta_len);
1207 else if (err->code != GOT_ERR_NO_SPACE) {
1212 err = got_delta_get_sizes(&base_size, &result_size,
1213 delta_buf, delta_len);
1219 base_size = delta->size;
1220 if (base_size > *max_size)
1221 *max_size = base_size;
1222 if (result_size > *max_size)
1223 *max_size = result_size;
1229 const struct got_error *
1230 got_pack_get_max_delta_object_size(uint64_t *size, struct got_object *obj,
1231 struct got_pack *pack)
1233 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0)
1234 return got_error(GOT_ERR_OBJ_TYPE);
1236 return got_pack_get_delta_chain_max_size(size, &obj->deltas, pack);
1239 const struct got_error *
1240 got_pack_dump_delta_chain_to_file(size_t *result_size,
1241 struct got_delta_chain *deltas, struct got_pack *pack, FILE *outfile,
1242 FILE *base_file, FILE *accum_file)
1244 const struct got_error *err = NULL;
1245 struct got_delta *delta;
1246 uint8_t *base_buf = NULL, *accum_buf = NULL, *delta_buf;
1247 size_t base_bufsz = 0, accum_size = 0, delta_len;
1253 if (STAILQ_EMPTY(&deltas->entries))
1254 return got_error(GOT_ERR_BAD_DELTA_CHAIN);
1256 /* We process small enough files entirely in memory for speed. */
1257 err = got_pack_get_delta_chain_max_size(&max_size, deltas, pack);
1260 if (max_size < GOT_DELTA_RESULT_SIZE_CACHED_MAX) {
1261 accum_buf = malloc(max_size);
1262 if (accum_buf == NULL)
1263 return got_error_from_errno("malloc");
1267 if (fseeko(base_file, 0L, SEEK_SET) == -1)
1268 return got_error_from_errno("fseeko");
1269 if (fseeko(accum_file, 0L, SEEK_SET) == -1)
1270 return got_error_from_errno("fseeko");
1273 /* Deltas are ordered in ascending order. */
1274 STAILQ_FOREACH(delta, &deltas->entries, entry) {
1278 off_t delta_data_offset;
1280 /* Plain object types are the delta base. */
1281 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1282 delta->type != GOT_OBJ_TYPE_TREE &&
1283 delta->type != GOT_OBJ_TYPE_BLOB &&
1284 delta->type != GOT_OBJ_TYPE_TAG) {
1285 err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1289 delta_data_offset = delta->offset + delta->tslen;
1290 if (delta_data_offset >= pack->filesize) {
1291 err = got_error(GOT_ERR_PACK_OFFSET);
1294 if (pack->map == NULL) {
1295 if (lseek(pack->fd, delta_data_offset, SEEK_SET)
1297 err = got_error_from_errno("lseek");
1303 mapoff = (size_t)delta_data_offset;
1304 err = got_inflate_to_file_mmap(
1305 &base_bufsz, NULL, NULL, pack->map,
1306 mapoff, pack->filesize - mapoff,
1309 err = got_inflate_to_file_fd(
1310 &base_bufsz, NULL, NULL, pack->fd,
1314 mapoff = (size_t)delta_data_offset;
1315 err = got_inflate_to_mem_mmap(&base_buf,
1316 &base_bufsz, NULL, NULL,
1318 pack->filesize - mapoff);
1320 err = got_inflate_to_mem_fd(&base_buf,
1321 &base_bufsz, NULL, NULL, max_size,
1332 got_delta_cache_get(&delta_buf, &delta_len,
1333 pack->delta_cache, delta->data_offset);
1334 if (delta_buf == NULL) {
1336 err = read_delta_data(&delta_buf, &delta_len,
1337 delta->data_offset, pack);
1340 err = got_delta_cache_add(pack->delta_cache,
1341 delta->data_offset, delta_buf, delta_len);
1344 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);
1355 err = got_delta_apply(base_file, delta_buf,
1357 /* Final delta application writes to output file. */
1358 ++n < deltas->nentries ? accum_file : outfile,
1366 if (n < deltas->nentries) {
1367 /* Accumulated delta becomes the new base. */
1369 uint8_t *tmp = accum_buf;
1371 * Base buffer switches roles with accumulation
1372 * buffer. Ensure it can hold the largest
1373 * result in the delta chain. The initial
1374 * allocation might have been smaller.
1376 if (base_bufsz < max_size) {
1378 p = reallocarray(base_buf, 1, max_size);
1380 err = got_error_from_errno(
1385 base_bufsz = max_size;
1387 accum_buf = base_buf;
1390 FILE *tmp = accum_file;
1391 accum_file = base_file;
1402 size_t len = fwrite(accum_buf, 1, accum_size, outfile);
1404 if (len != accum_size)
1405 err = got_ferror(outfile, GOT_ERR_IO);
1409 *result_size = accum_size;
1413 const struct got_error *
1414 got_pack_dump_delta_chain_to_mem(uint8_t **outbuf, size_t *outlen,
1415 struct got_delta_chain *deltas, struct got_pack *pack)
1417 const struct got_error *err = NULL;
1418 struct got_delta *delta;
1419 uint8_t *base_buf = NULL, *accum_buf = NULL, *delta_buf;
1420 size_t base_bufsz = 0, accum_size = 0, delta_len;
1427 if (STAILQ_EMPTY(&deltas->entries))
1428 return got_error(GOT_ERR_BAD_DELTA_CHAIN);
1430 err = got_pack_get_delta_chain_max_size(&max_size, deltas, pack);
1433 accum_buf = malloc(max_size);
1434 if (accum_buf == NULL)
1435 return got_error_from_errno("malloc");
1437 /* Deltas are ordered in ascending order. */
1438 STAILQ_FOREACH(delta, &deltas->entries, entry) {
1441 size_t delta_data_offset;
1443 /* Plain object types are the delta base. */
1444 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1445 delta->type != GOT_OBJ_TYPE_TREE &&
1446 delta->type != GOT_OBJ_TYPE_BLOB &&
1447 delta->type != GOT_OBJ_TYPE_TAG) {
1448 err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1452 delta_data_offset = delta->offset + delta->tslen;
1453 if (delta_data_offset >= pack->filesize) {
1454 err = got_error(GOT_ERR_PACK_OFFSET);
1458 size_t mapoff = (size_t)delta_data_offset;
1459 err = got_inflate_to_mem_mmap(&base_buf,
1460 &base_bufsz, NULL, NULL, pack->map,
1461 mapoff, pack->filesize - mapoff);
1463 if (lseek(pack->fd, delta_data_offset, SEEK_SET)
1465 err = got_error_from_errno("lseek");
1468 err = got_inflate_to_mem_fd(&base_buf,
1469 &base_bufsz, NULL, NULL, max_size,
1478 got_delta_cache_get(&delta_buf, &delta_len,
1479 pack->delta_cache, delta->data_offset);
1480 if (delta_buf == NULL) {
1482 err = read_delta_data(&delta_buf, &delta_len,
1483 delta->data_offset, pack);
1486 err = got_delta_cache_add(pack->delta_cache,
1487 delta->data_offset, delta_buf, delta_len);
1490 else if (err->code != GOT_ERR_NO_SPACE) {
1495 err = got_delta_apply_in_mem(base_buf, base_bufsz,
1496 delta_buf, delta_len, accum_buf,
1497 &accum_size, max_size);
1504 if (n < deltas->nentries) {
1505 /* Accumulated delta becomes the new base. */
1506 uint8_t *tmp = accum_buf;
1508 * Base buffer switches roles with accumulation buffer.
1509 * Ensure it can hold the largest result in the delta
1510 * chain. Initial allocation might have been smaller.
1512 if (base_bufsz < max_size) {
1514 p = reallocarray(base_buf, 1, max_size);
1516 err = got_error_from_errno(
1521 base_bufsz = max_size;
1523 accum_buf = base_buf;
1535 *outbuf = accum_buf;
1536 *outlen = accum_size;
1541 const struct got_error *
1542 got_packfile_extract_object(struct got_pack *pack, struct got_object *obj,
1543 FILE *outfile, FILE *base_file, FILE *accum_file)
1545 const struct got_error *err = NULL;
1547 if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
1548 return got_error(GOT_ERR_OBJ_NOT_PACKED);
1550 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0) {
1551 if (obj->pack_offset >= pack->filesize)
1552 return got_error(GOT_ERR_PACK_OFFSET);
1555 size_t mapoff = (size_t)obj->pack_offset;
1556 err = got_inflate_to_file_mmap(&obj->size, NULL, NULL,
1557 pack->map, mapoff, pack->filesize - mapoff,
1560 if (lseek(pack->fd, obj->pack_offset, SEEK_SET) == -1)
1561 return got_error_from_errno("lseek");
1562 err = got_inflate_to_file_fd(&obj->size, NULL, NULL,
1566 err = got_pack_dump_delta_chain_to_file(&obj->size,
1567 &obj->deltas, pack, outfile, base_file, accum_file);
1572 const struct got_error *
1573 got_packfile_extract_object_to_mem(uint8_t **buf, size_t *len,
1574 struct got_object *obj, struct got_pack *pack)
1576 const struct got_error *err = NULL;
1578 if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
1579 return got_error(GOT_ERR_OBJ_NOT_PACKED);
1581 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0) {
1582 if (obj->pack_offset >= pack->filesize)
1583 return got_error(GOT_ERR_PACK_OFFSET);
1585 size_t mapoff = (size_t)obj->pack_offset;
1586 err = got_inflate_to_mem_mmap(buf, len, NULL, NULL,
1587 pack->map, mapoff, pack->filesize - mapoff);
1589 if (lseek(pack->fd, obj->pack_offset, SEEK_SET) == -1)
1590 return got_error_from_errno("lseek");
1591 err = got_inflate_to_mem_fd(buf, len, NULL, NULL,
1592 obj->size, pack->fd);
1595 err = got_pack_dump_delta_chain_to_mem(buf, len, &obj->deltas,
1601 const struct got_error *
1602 got_packfile_extract_raw_delta(uint8_t **delta_buf, size_t *delta_size,
1603 off_t *delta_offset, off_t *base_offset, struct got_object_id *base_id,
1604 uint64_t *base_size, uint64_t *result_size, struct got_pack *pack,
1605 struct got_packidx *packidx, int idx)
1607 const struct got_error *err = NULL;
1611 size_t tslen, delta_hdrlen;
1620 offset = got_packidx_get_object_offset(packidx, idx);
1621 if (offset == (uint64_t)-1)
1622 return got_error(GOT_ERR_BAD_PACKIDX);
1624 if (offset >= pack->filesize)
1625 return got_error(GOT_ERR_PACK_OFFSET);
1627 err = got_pack_parse_object_type_and_size(&type, &size, &tslen,
1632 if (tslen + size < tslen || offset + size < size ||
1633 tslen + offset < tslen)
1634 return got_error(GOT_ERR_PACK_OFFSET);
1637 case GOT_OBJ_TYPE_OFFSET_DELTA:
1638 err = got_pack_parse_offset_delta(base_offset, &delta_hdrlen,
1639 pack, offset, tslen);
1643 case GOT_OBJ_TYPE_REF_DELTA:
1644 err = got_pack_parse_ref_delta(base_id, pack, offset, tslen);
1647 delta_hdrlen = SHA1_DIGEST_LENGTH;
1650 return got_error_fmt(GOT_ERR_OBJ_TYPE,
1651 "non-delta object type %d found at offset %llu",
1655 if (tslen + delta_hdrlen < delta_hdrlen ||
1656 offset + delta_hdrlen < delta_hdrlen)
1657 return got_error(GOT_ERR_BAD_DELTA);
1659 err = read_delta_data(delta_buf, delta_size,
1660 offset + tslen + delta_hdrlen, pack);
1664 if (*delta_size != size) {
1665 err = got_error(GOT_ERR_BAD_DELTA);
1669 err = got_delta_get_sizes(base_size, result_size, *delta_buf, size);
1673 *delta_offset = offset;