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"
40 #include "got_lib_sha1.h"
41 #include "got_lib_delta.h"
42 #include "got_lib_delta_cache.h"
43 #include "got_lib_inflate.h"
44 #include "got_lib_object.h"
45 #include "got_lib_object_parse.h"
46 #include "got_lib_privsep.h"
47 #include "got_lib_pack.h"
50 #define nitems(_a) (sizeof(_a) / sizeof((_a)[0]))
54 #define MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
57 static const struct got_error *
58 verify_fanout_table(uint32_t *fanout_table)
62 for (i = 0; i < 0xff - 1; i++) {
63 if (be32toh(fanout_table[i]) > be32toh(fanout_table[i + 1]))
64 return got_error(GOT_ERR_BAD_PACKIDX);
70 const struct got_error *
71 got_packidx_init_hdr(struct got_packidx *p, int verify, off_t packfile_size)
73 const struct got_error *err = NULL;
74 struct got_packidx_v2_hdr *h;
76 uint8_t sha1[SHA1_DIGEST_LENGTH];
77 size_t nobj, len_fanout, len_ids, offset, remain;
87 if (remain < sizeof(*h->magic)) {
88 err = got_error(GOT_ERR_BAD_PACKIDX);
92 h->magic = (uint32_t *)(p->map + offset);
94 h->magic = malloc(sizeof(*h->magic));
95 if (h->magic == NULL) {
96 err = got_error_from_errno("malloc");
99 n = read(p->fd, h->magic, sizeof(*h->magic));
101 err = got_error_from_errno("read");
103 } else if (n != sizeof(*h->magic)) {
104 err = got_error(GOT_ERR_BAD_PACKIDX);
108 if (*h->magic != htobe32(GOT_PACKIDX_V2_MAGIC)) {
109 err = got_error(GOT_ERR_BAD_PACKIDX);
112 offset += sizeof(*h->magic);
113 remain -= sizeof(*h->magic);
116 SHA1Update(&ctx, (uint8_t *)h->magic, sizeof(*h->magic));
118 if (remain < sizeof(*h->version)) {
119 err = got_error(GOT_ERR_BAD_PACKIDX);
123 h->version = (uint32_t *)(p->map + offset);
125 h->version = malloc(sizeof(*h->version));
126 if (h->version == NULL) {
127 err = got_error_from_errno("malloc");
130 n = read(p->fd, h->version, sizeof(*h->version));
132 err = got_error_from_errno("read");
134 } else if (n != sizeof(*h->version)) {
135 err = got_error(GOT_ERR_BAD_PACKIDX);
139 if (*h->version != htobe32(GOT_PACKIDX_VERSION)) {
140 err = got_error(GOT_ERR_BAD_PACKIDX);
143 offset += sizeof(*h->version);
144 remain -= sizeof(*h->version);
147 SHA1Update(&ctx, (uint8_t *)h->version, sizeof(*h->version));
150 sizeof(*h->fanout_table) * GOT_PACKIDX_V2_FANOUT_TABLE_ITEMS;
151 if (remain < len_fanout) {
152 err = got_error(GOT_ERR_BAD_PACKIDX);
156 h->fanout_table = (uint32_t *)(p->map + offset);
158 h->fanout_table = malloc(len_fanout);
159 if (h->fanout_table == NULL) {
160 err = got_error_from_errno("malloc");
163 n = read(p->fd, h->fanout_table, len_fanout);
165 err = got_error_from_errno("read");
167 } else if (n != len_fanout) {
168 err = got_error(GOT_ERR_BAD_PACKIDX);
172 err = verify_fanout_table(h->fanout_table);
176 SHA1Update(&ctx, (uint8_t *)h->fanout_table, len_fanout);
177 offset += len_fanout;
178 remain -= len_fanout;
180 nobj = be32toh(h->fanout_table[0xff]);
181 len_ids = nobj * sizeof(*h->sorted_ids);
182 if (len_ids <= nobj || len_ids > remain) {
183 err = got_error(GOT_ERR_BAD_PACKIDX);
188 (struct got_packidx_object_id *)((uint8_t*)(p->map + offset));
190 h->sorted_ids = malloc(len_ids);
191 if (h->sorted_ids == NULL) {
192 err = got_error(GOT_ERR_BAD_PACKIDX);
195 n = read(p->fd, h->sorted_ids, len_ids);
197 err = got_error_from_errno("read");
198 else if (n != len_ids) {
199 err = got_error(GOT_ERR_BAD_PACKIDX);
204 SHA1Update(&ctx, (uint8_t *)h->sorted_ids, len_ids);
208 if (remain < nobj * sizeof(*h->crc32)) {
209 err = got_error(GOT_ERR_BAD_PACKIDX);
213 h->crc32 = (uint32_t *)((uint8_t*)(p->map + offset));
215 h->crc32 = malloc(nobj * sizeof(*h->crc32));
216 if (h->crc32 == NULL) {
217 err = got_error_from_errno("malloc");
220 n = read(p->fd, h->crc32, nobj * sizeof(*h->crc32));
222 err = got_error_from_errno("read");
223 else if (n != nobj * sizeof(*h->crc32)) {
224 err = got_error(GOT_ERR_BAD_PACKIDX);
229 SHA1Update(&ctx, (uint8_t *)h->crc32, nobj * sizeof(*h->crc32));
230 remain -= nobj * sizeof(*h->crc32);
231 offset += nobj * sizeof(*h->crc32);
233 if (remain < nobj * sizeof(*h->offsets)) {
234 err = got_error(GOT_ERR_BAD_PACKIDX);
238 h->offsets = (uint32_t *)((uint8_t*)(p->map + offset));
240 h->offsets = malloc(nobj * sizeof(*h->offsets));
241 if (h->offsets == NULL) {
242 err = got_error_from_errno("malloc");
245 n = read(p->fd, h->offsets, nobj * sizeof(*h->offsets));
247 err = got_error_from_errno("read");
248 else if (n != nobj * sizeof(*h->offsets)) {
249 err = got_error(GOT_ERR_BAD_PACKIDX);
254 SHA1Update(&ctx, (uint8_t *)h->offsets,
255 nobj * sizeof(*h->offsets));
256 remain -= nobj * sizeof(*h->offsets);
257 offset += nobj * sizeof(*h->offsets);
259 /* Large file offsets are contained only in files > 2GB. */
260 if (verify || packfile_size > 0x7fffffff) {
261 for (i = 0; i < nobj; i++) {
262 uint32_t o = h->offsets[i];
263 if (o & htobe32(GOT_PACKIDX_OFFSET_VAL_IS_LARGE_IDX))
267 if (p->nlargeobj == 0)
269 else if (packfile_size <= 0x7fffffff) {
270 err = got_error(GOT_ERR_BAD_PACKIDX);
274 if (remain < p->nlargeobj * sizeof(*h->large_offsets)) {
275 err = got_error(GOT_ERR_BAD_PACKIDX);
279 h->large_offsets = (uint64_t *)((uint8_t*)(p->map + offset));
281 h->large_offsets = malloc(p->nlargeobj *
282 sizeof(*h->large_offsets));
283 if (h->large_offsets == NULL) {
284 err = got_error_from_errno("malloc");
287 n = read(p->fd, h->large_offsets,
288 p->nlargeobj * sizeof(*h->large_offsets));
290 err = got_error_from_errno("read");
291 else if (n != p->nlargeobj * sizeof(*h->large_offsets)) {
292 err = got_error(GOT_ERR_BAD_PACKIDX);
297 SHA1Update(&ctx, (uint8_t*)h->large_offsets,
298 p->nlargeobj * sizeof(*h->large_offsets));
299 remain -= p->nlargeobj * sizeof(*h->large_offsets);
300 offset += p->nlargeobj * sizeof(*h->large_offsets);
303 if (remain < sizeof(*h->trailer)) {
304 err = got_error(GOT_ERR_BAD_PACKIDX);
309 (struct got_packidx_trailer *)((uint8_t*)(p->map + offset));
311 h->trailer = malloc(sizeof(*h->trailer));
312 if (h->trailer == NULL) {
313 err = got_error_from_errno("malloc");
316 n = read(p->fd, h->trailer, sizeof(*h->trailer));
318 err = got_error_from_errno("read");
319 else if (n != sizeof(*h->trailer)) {
320 err = got_error(GOT_ERR_BAD_PACKIDX);
325 SHA1Update(&ctx, h->trailer->packfile_sha1, SHA1_DIGEST_LENGTH);
326 SHA1Final(sha1, &ctx);
327 if (memcmp(h->trailer->packidx_sha1, sha1,
328 SHA1_DIGEST_LENGTH) != 0)
329 err = got_error(GOT_ERR_PACKIDX_CSUM);
335 const struct got_error *
336 got_packidx_open(struct got_packidx **packidx,
337 int dir_fd, const char *relpath, int verify)
339 const struct got_error *err = NULL;
340 struct got_packidx *p = NULL;
342 struct stat idx_sb, pack_sb;
346 err = got_packidx_get_packfile_path(&pack_relpath, relpath);
351 * Ensure that a corresponding pack file exists.
352 * Some Git repositories have this problem. Git seems to ignore
353 * the existence of lonely pack index files but we do not.
355 if (fstatat(dir_fd, pack_relpath, &pack_sb, 0) == -1) {
356 if (errno == ENOENT) {
357 err = got_error_fmt(GOT_ERR_LONELY_PACKIDX,
360 err = got_error_from_errno2("fstatat", pack_relpath);
364 p = calloc(1, sizeof(*p));
366 err = got_error_from_errno("calloc");
370 p->fd = openat(dir_fd, relpath, O_RDONLY | O_NOFOLLOW | O_CLOEXEC);
372 err = got_error_from_errno2("openat", relpath);
376 if (fstat(p->fd, &idx_sb) != 0) {
377 err = got_error_from_errno2("fstat", relpath);
380 p->len = idx_sb.st_size;
381 if (p->len < sizeof(p->hdr)) {
382 err = got_error(GOT_ERR_BAD_PACKIDX);
386 p->path_packidx = strdup(relpath);
387 if (p->path_packidx == NULL) {
388 err = got_error_from_errno("strdup");
392 #ifndef GOT_PACK_NO_MMAP
393 p->map = mmap(NULL, p->len, PROT_READ, MAP_PRIVATE, p->fd, 0);
394 if (p->map == MAP_FAILED) {
395 if (errno != ENOMEM) {
396 err = got_error_from_errno("mmap");
399 p->map = NULL; /* fall back to read(2) */
403 err = got_packidx_init_hdr(p, verify, pack_sb.st_size);
407 got_packidx_close(p);
414 const struct got_error *
415 got_packidx_close(struct got_packidx *packidx)
417 const struct got_error *err = NULL;
419 free(packidx->path_packidx);
421 if (munmap(packidx->map, packidx->len) == -1)
422 err = got_error_from_errno("munmap");
424 free(packidx->hdr.magic);
425 free(packidx->hdr.version);
426 free(packidx->hdr.fanout_table);
427 free(packidx->hdr.sorted_ids);
428 free(packidx->hdr.crc32);
429 free(packidx->hdr.offsets);
430 free(packidx->hdr.large_offsets);
431 free(packidx->hdr.trailer);
433 if (close(packidx->fd) == -1 && err == NULL)
434 err = got_error_from_errno("close");
435 free(packidx->sorted_offsets);
436 free(packidx->sorted_large_offsets);
442 const struct got_error *
443 got_packidx_get_packfile_path(char **path_packfile, const char *path_packidx)
447 /* Packfile path contains ".pack" instead of ".idx", so add one byte. */
448 size = strlen(path_packidx) + 2;
449 if (size < GOT_PACKFILE_NAMELEN + 1)
450 return got_error_path(path_packidx, GOT_ERR_BAD_PATH);
452 *path_packfile = malloc(size);
453 if (*path_packfile == NULL)
454 return got_error_from_errno("malloc");
456 /* Copy up to and excluding ".idx". */
457 if (strlcpy(*path_packfile, path_packidx,
458 size - strlen(GOT_PACKIDX_SUFFIX) - 1) >= size)
459 return got_error(GOT_ERR_NO_SPACE);
461 if (strlcat(*path_packfile, GOT_PACKFILE_SUFFIX, size) >= size)
462 return got_error(GOT_ERR_NO_SPACE);
468 got_packidx_get_object_offset(struct got_packidx *packidx, int idx)
470 uint32_t offset = be32toh(packidx->hdr.offsets[idx]);
471 if (offset & GOT_PACKIDX_OFFSET_VAL_IS_LARGE_IDX) {
473 idx = offset & GOT_PACKIDX_OFFSET_VAL_MASK;
474 if (idx < 0 || idx >= packidx->nlargeobj ||
475 packidx->hdr.large_offsets == NULL)
477 loffset = be64toh(packidx->hdr.large_offsets[idx]);
478 return (loffset > INT64_MAX ? -1 : (off_t)loffset);
480 return (off_t)(offset & GOT_PACKIDX_OFFSET_VAL_MASK);
484 got_packidx_get_object_idx(struct got_packidx *packidx,
485 struct got_object_id *id)
487 u_int8_t id0 = id->sha1[0];
488 uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
489 int left = 0, right = totobj - 1;
492 left = be32toh(packidx->hdr.fanout_table[id0 - 1]);
494 while (left <= right) {
495 struct got_packidx_object_id *oid;
498 i = ((left + right) / 2);
499 oid = &packidx->hdr.sorted_ids[i];
500 cmp = memcmp(id->sha1, oid->sha1, SHA1_DIGEST_LENGTH);
513 offset_cmp(const void *pa, const void *pb)
515 const struct got_pack_offset_index *a, *b;
517 a = (const struct got_pack_offset_index *)pa;
518 b = (const struct got_pack_offset_index *)pb;
520 if (a->offset < b->offset)
522 else if (a->offset > b->offset)
529 large_offset_cmp(const void *pa, const void *pb)
531 const struct got_pack_large_offset_index *a, *b;
533 a = (const struct got_pack_large_offset_index *)pa;
534 b = (const struct got_pack_large_offset_index *)pb;
536 if (a->offset < b->offset)
538 else if (a->offset > b->offset)
544 static const struct got_error *
545 build_offset_index(struct got_packidx *p)
547 uint32_t nobj = be32toh(p->hdr.fanout_table[0xff]);
548 unsigned int i, j, k;
550 p->sorted_offsets = calloc(nobj - p->nlargeobj,
551 sizeof(p->sorted_offsets[0]));
552 if (p->sorted_offsets == NULL)
553 return got_error_from_errno("calloc");
555 if (p->nlargeobj > 0) {
556 p->sorted_large_offsets = calloc(p->nlargeobj,
557 sizeof(p->sorted_large_offsets[0]));
558 if (p->sorted_large_offsets == NULL)
559 return got_error_from_errno("calloc");
564 for (i = 0; i < nobj; i++) {
565 uint32_t offset = be32toh(p->hdr.offsets[i]);
566 if (offset & GOT_PACKIDX_OFFSET_VAL_IS_LARGE_IDX) {
569 idx = offset & GOT_PACKIDX_OFFSET_VAL_MASK;
570 if (idx >= p->nlargeobj ||
572 p->hdr.large_offsets == NULL)
573 return got_error(GOT_ERR_BAD_PACKIDX);
574 loffset = be64toh(p->hdr.large_offsets[idx]);
575 p->sorted_large_offsets[j].offset = loffset;
576 p->sorted_large_offsets[j].idx = i;
579 p->sorted_offsets[k].offset = offset;
580 p->sorted_offsets[k].idx = i;
584 if (j != p->nlargeobj || k != nobj - p->nlargeobj)
585 return got_error(GOT_ERR_BAD_PACKIDX);
587 qsort(p->sorted_offsets, nobj - p->nlargeobj,
588 sizeof(p->sorted_offsets[0]), offset_cmp);
590 if (p->sorted_large_offsets)
591 qsort(p->sorted_large_offsets, p->nlargeobj,
592 sizeof(p->sorted_large_offsets[0]), large_offset_cmp);
597 const struct got_error *
598 got_packidx_get_offset_idx(int *idx, struct got_packidx *packidx, off_t offset)
600 const struct got_error *err;
601 uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
606 if (packidx->sorted_offsets == NULL) {
607 err = build_offset_index(packidx);
612 if (offset >= 0x7fffffff) {
614 left = 0, right = packidx->nlargeobj - 1;
615 while (left <= right) {
616 i = ((left + right) / 2);
617 lo = packidx->sorted_large_offsets[i].offset;
619 *idx = packidx->sorted_large_offsets[i].idx;
621 } else if (offset > lo)
623 else if (offset < lo)
628 left = 0, right = totobj - packidx->nlargeobj - 1;
629 while (left <= right) {
630 i = ((left + right) / 2);
631 o = packidx->sorted_offsets[i].offset;
633 *idx = packidx->sorted_offsets[i].idx;
635 } else if (offset > o)
645 const struct got_error *
646 got_packidx_get_object_id(struct got_object_id *id,
647 struct got_packidx *packidx, int idx)
649 uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
650 struct got_packidx_object_id *oid;
652 if (idx < 0 || idx >= totobj)
653 return got_error(GOT_ERR_NO_OBJ);
655 oid = &packidx->hdr.sorted_ids[idx];
656 memcpy(id->sha1, oid->sha1, SHA1_DIGEST_LENGTH);
660 const struct got_error *
661 got_packidx_match_id_str_prefix(struct got_object_id_queue *matched_ids,
662 struct got_packidx *packidx, const char *id_str_prefix)
664 const struct got_error *err = NULL;
666 uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
668 size_t prefix_len = strlen(id_str_prefix);
669 struct got_packidx_object_id *oid;
672 STAILQ_INIT(matched_ids);
675 return got_error_path(id_str_prefix, GOT_ERR_BAD_OBJ_ID_STR);
677 hex[0] = id_str_prefix[0];
678 hex[1] = id_str_prefix[1];
680 if (!got_parse_xdigit(&id0, hex))
681 return got_error_path(id_str_prefix, GOT_ERR_BAD_OBJ_ID_STR);
684 i = be32toh(packidx->hdr.fanout_table[id0 - 1]);
685 oid = &packidx->hdr.sorted_ids[i];
686 while (i < totobj && oid->sha1[0] == id0) {
687 char id_str[SHA1_DIGEST_STRING_LENGTH];
688 struct got_object_qid *qid;
691 if (!got_sha1_digest_to_str(oid->sha1, id_str, sizeof(id_str)))
692 return got_error(GOT_ERR_NO_SPACE);
694 cmp = strncmp(id_str, id_str_prefix, prefix_len);
696 oid = &packidx->hdr.sorted_ids[++i];
701 err = got_object_qid_alloc_partial(&qid);
704 memcpy(qid->id.sha1, oid->sha1, SHA1_DIGEST_LENGTH);
705 STAILQ_INSERT_TAIL(matched_ids, qid, entry);
707 oid = &packidx->hdr.sorted_ids[++i];
711 got_object_id_queue_free(matched_ids);
715 static const struct got_error *
716 pack_stop_privsep_child(struct got_pack *pack)
718 const struct got_error *err = NULL;
720 if (pack->privsep_child == NULL)
723 err = got_privsep_send_stop(pack->privsep_child->imsg_fd);
726 err = got_privsep_wait_for_child(pack->privsep_child->pid);
727 if (close(pack->privsep_child->imsg_fd) == -1 && err == NULL)
728 err = got_error_from_errno("close");
729 free(pack->privsep_child->ibuf);
730 free(pack->privsep_child);
731 pack->privsep_child = NULL;
735 const struct got_error *
736 got_pack_close(struct got_pack *pack)
738 const struct got_error *err = NULL;
740 err = pack_stop_privsep_child(pack);
741 if (pack->map && munmap(pack->map, pack->filesize) == -1 && !err)
742 err = got_error_from_errno("munmap");
743 if (pack->fd != -1 && close(pack->fd) == -1 && err == NULL)
744 err = got_error_from_errno("close");
746 free(pack->path_packfile);
747 pack->path_packfile = NULL;
749 if (pack->delta_cache) {
750 got_delta_cache_free(pack->delta_cache);
751 pack->delta_cache = NULL;
757 const struct got_error *
758 got_pack_parse_object_type_and_size(uint8_t *type, uint64_t *size, size_t *len,
759 struct got_pack *pack, off_t offset)
769 if (offset >= pack->filesize)
770 return got_error(GOT_ERR_PACK_OFFSET);
773 mapoff = (size_t)offset;
775 if (lseek(pack->fd, offset, SEEK_SET) == -1)
776 return got_error_from_errno("lseek");
780 /* We do not support size values which don't fit in 64 bit. */
782 return got_error(GOT_ERR_NO_SPACE);
785 if (mapoff + sizeof(sizeN) >= pack->filesize)
786 return got_error(GOT_ERR_BAD_PACKFILE);
787 sizeN = *(pack->map + mapoff);
788 mapoff += sizeof(sizeN);
790 ssize_t n = read(pack->fd, &sizeN, sizeof(sizeN));
792 return got_error_from_errno("read");
793 if (n != sizeof(sizeN))
794 return got_error(GOT_ERR_BAD_PACKFILE);
796 *len += sizeof(sizeN);
799 t = (sizeN & GOT_PACK_OBJ_SIZE0_TYPE_MASK) >>
800 GOT_PACK_OBJ_SIZE0_TYPE_MASK_SHIFT;
801 s = (sizeN & GOT_PACK_OBJ_SIZE0_VAL_MASK);
803 size_t shift = 4 + 7 * (i - 1);
804 s |= ((sizeN & GOT_PACK_OBJ_SIZE_VAL_MASK) << shift);
807 } while (sizeN & GOT_PACK_OBJ_SIZE_MORE);
814 static const struct got_error *
815 open_plain_object(struct got_object **obj, struct got_object_id *id,
816 uint8_t type, off_t offset, size_t size, int idx)
818 *obj = calloc(1, sizeof(**obj));
820 return got_error_from_errno("calloc");
823 (*obj)->flags = GOT_OBJ_FLAG_PACKED;
824 (*obj)->pack_idx = idx;
827 memcpy(&(*obj)->id, id, sizeof((*obj)->id));
828 (*obj)->pack_offset = offset;
833 static const struct got_error *
834 parse_negative_offset(int64_t *offset, size_t *len, struct got_pack *pack,
845 /* We do not support offset values which don't fit in 64 bit. */
847 return got_error(GOT_ERR_NO_SPACE);
851 mapoff = (size_t)delta_offset + *len;
852 if (mapoff + sizeof(offN) >= pack->filesize)
853 return got_error(GOT_ERR_PACK_OFFSET);
854 offN = *(pack->map + mapoff);
857 n = read(pack->fd, &offN, sizeof(offN));
859 return got_error_from_errno("read");
860 if (n != sizeof(offN))
861 return got_error(GOT_ERR_BAD_PACKFILE);
863 *len += sizeof(offN);
866 o = (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
870 o += (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
873 } while (offN & GOT_PACK_OBJ_DELTA_OFF_MORE);
879 const struct got_error *
880 got_pack_parse_offset_delta(off_t *base_offset, size_t *len,
881 struct got_pack *pack, off_t offset, int tslen)
883 const struct got_error *err;
889 err = parse_negative_offset(&negoffset, &negofflen, pack,
894 /* Compute the base object's offset (must be in the same pack file). */
895 *base_offset = (offset - negoffset);
896 if (*base_offset <= 0)
897 return got_error(GOT_ERR_BAD_PACKFILE);
903 static const struct got_error *
904 read_delta_data(uint8_t **delta_buf, size_t *delta_len,
905 size_t delta_data_offset, struct got_pack *pack)
907 const struct got_error *err = NULL;
910 if (delta_data_offset >= pack->filesize)
911 return got_error(GOT_ERR_PACK_OFFSET);
912 err = got_inflate_to_mem_mmap(delta_buf, delta_len,
913 NULL, NULL, pack->map, delta_data_offset,
914 pack->filesize - delta_data_offset);
916 if (lseek(pack->fd, delta_data_offset, SEEK_SET) == -1)
917 return got_error_from_errno("lseek");
918 err = got_inflate_to_mem_fd(delta_buf, delta_len, NULL,
924 static const struct got_error *
925 add_delta(struct got_delta_chain *deltas, off_t delta_offset, size_t tslen,
926 int delta_type, size_t delta_size, size_t delta_data_offset)
928 struct got_delta *delta;
930 delta = got_delta_open(delta_offset, tslen, delta_type, delta_size,
933 return got_error_from_errno("got_delta_open");
934 /* delta is freed in got_object_close() */
936 STAILQ_INSERT_HEAD(&deltas->entries, delta, entry);
940 static const struct got_error *
941 resolve_offset_delta(struct got_delta_chain *deltas,
942 struct got_packidx *packidx, struct got_pack *pack, off_t delta_offset,
943 size_t tslen, int delta_type, size_t delta_size, unsigned int recursion)
946 const struct got_error *err;
951 off_t delta_data_offset;
954 err = got_pack_parse_offset_delta(&base_offset, &consumed, pack,
955 delta_offset, tslen);
959 delta_data_offset = delta_offset + tslen + consumed;
960 if (delta_data_offset >= pack->filesize)
961 return got_error(GOT_ERR_PACK_OFFSET);
963 if (pack->map == NULL) {
964 delta_data_offset = lseek(pack->fd, 0, SEEK_CUR);
965 if (delta_data_offset == -1)
966 return got_error_from_errno("lseek");
969 err = add_delta(deltas, delta_offset, tslen, delta_type, delta_size,
974 /* An offset delta must be in the same packfile. */
975 if (base_offset >= pack->filesize)
976 return got_error(GOT_ERR_PACK_OFFSET);
978 err = got_pack_parse_object_type_and_size(&base_type, &base_size,
979 &base_tslen, pack, base_offset);
983 return got_pack_resolve_delta_chain(deltas, packidx, pack, base_offset,
984 base_tslen, base_type, base_size, recursion - 1);
987 const struct got_error *
988 got_pack_parse_ref_delta(struct got_object_id *id,
989 struct got_pack *pack, off_t delta_offset, int tslen)
992 size_t mapoff = delta_offset + tslen;
993 if (mapoff + sizeof(*id) >= pack->filesize)
994 return got_error(GOT_ERR_PACK_OFFSET);
995 memcpy(id, pack->map + mapoff, sizeof(*id));
998 n = read(pack->fd, id, sizeof(*id));
1000 return got_error_from_errno("read");
1001 if (n != sizeof(*id))
1002 return got_error(GOT_ERR_BAD_PACKFILE);
1008 static const struct got_error *
1009 resolve_ref_delta(struct got_delta_chain *deltas, struct got_packidx *packidx,
1010 struct got_pack *pack, off_t delta_offset, size_t tslen, int delta_type,
1011 size_t delta_size, unsigned int recursion)
1013 const struct got_error *err;
1014 struct got_object_id id;
1020 off_t delta_data_offset;
1022 if (delta_offset + tslen >= pack->filesize)
1023 return got_error(GOT_ERR_PACK_OFFSET);
1025 err = got_pack_parse_ref_delta(&id, pack, delta_offset, tslen);
1029 delta_data_offset = delta_offset + tslen + sizeof(id);
1031 delta_data_offset = lseek(pack->fd, 0, SEEK_CUR);
1032 if (delta_data_offset == -1)
1033 return got_error_from_errno("lseek");
1036 err = add_delta(deltas, delta_offset, tslen, delta_type, delta_size,
1041 /* Delta base must be in the same pack file. */
1042 idx = got_packidx_get_object_idx(packidx, &id);
1044 return got_error(GOT_ERR_NO_OBJ);
1046 base_offset = got_packidx_get_object_offset(packidx, idx);
1047 if (base_offset == (uint64_t)-1)
1048 return got_error(GOT_ERR_BAD_PACKIDX);
1050 if (base_offset >= pack->filesize)
1051 return got_error(GOT_ERR_PACK_OFFSET);
1053 err = got_pack_parse_object_type_and_size(&base_type, &base_size,
1054 &base_tslen, pack, base_offset);
1058 return got_pack_resolve_delta_chain(deltas, packidx, pack, base_offset,
1059 base_tslen, base_type, base_size, recursion - 1);
1062 const struct got_error *
1063 got_pack_resolve_delta_chain(struct got_delta_chain *deltas,
1064 struct got_packidx *packidx, struct got_pack *pack, off_t delta_offset,
1065 size_t tslen, int delta_type, size_t delta_size, unsigned int recursion)
1067 const struct got_error *err = NULL;
1069 if (--recursion == 0)
1070 return got_error(GOT_ERR_RECURSION);
1072 switch (delta_type) {
1073 case GOT_OBJ_TYPE_COMMIT:
1074 case GOT_OBJ_TYPE_TREE:
1075 case GOT_OBJ_TYPE_BLOB:
1076 case GOT_OBJ_TYPE_TAG:
1077 /* Plain types are the final delta base. Recursion ends. */
1078 err = add_delta(deltas, delta_offset, tslen, delta_type,
1081 case GOT_OBJ_TYPE_OFFSET_DELTA:
1082 err = resolve_offset_delta(deltas, packidx, pack,
1083 delta_offset, tslen, delta_type, delta_size, recursion - 1);
1085 case GOT_OBJ_TYPE_REF_DELTA:
1086 err = resolve_ref_delta(deltas, packidx, pack,
1087 delta_offset, tslen, delta_type, delta_size, recursion - 1);
1090 return got_error(GOT_ERR_OBJ_TYPE);
1096 static const struct got_error *
1097 open_delta_object(struct got_object **obj, struct got_packidx *packidx,
1098 struct got_pack *pack, struct got_object_id *id, off_t offset,
1099 size_t tslen, int delta_type, size_t delta_size, int idx)
1101 const struct got_error *err = NULL;
1104 *obj = calloc(1, sizeof(**obj));
1106 return got_error_from_errno("calloc");
1110 (*obj)->size = 0; /* Not known because deltas aren't applied yet. */
1111 memcpy(&(*obj)->id, id, sizeof((*obj)->id));
1112 (*obj)->pack_offset = offset + tslen;
1114 STAILQ_INIT(&(*obj)->deltas.entries);
1115 (*obj)->flags |= GOT_OBJ_FLAG_DELTIFIED;
1116 (*obj)->flags |= GOT_OBJ_FLAG_PACKED;
1117 (*obj)->pack_idx = idx;
1119 err = got_pack_resolve_delta_chain(&(*obj)->deltas, packidx, pack,
1120 offset, tslen, delta_type, delta_size,
1121 GOT_DELTA_CHAIN_RECURSION_MAX);
1125 err = got_delta_chain_get_base_type(&resolved_type, &(*obj)->deltas);
1128 (*obj)->type = resolved_type;
1131 got_object_close(*obj);
1137 const struct got_error *
1138 got_packfile_open_object(struct got_object **obj, struct got_pack *pack,
1139 struct got_packidx *packidx, int idx, struct got_object_id *id)
1141 const struct got_error *err = NULL;
1149 offset = got_packidx_get_object_offset(packidx, idx);
1150 if (offset == (uint64_t)-1)
1151 return got_error(GOT_ERR_BAD_PACKIDX);
1153 err = got_pack_parse_object_type_and_size(&type, &size, &tslen,
1159 case GOT_OBJ_TYPE_COMMIT:
1160 case GOT_OBJ_TYPE_TREE:
1161 case GOT_OBJ_TYPE_BLOB:
1162 case GOT_OBJ_TYPE_TAG:
1163 err = open_plain_object(obj, id, type, offset + tslen,
1166 case GOT_OBJ_TYPE_OFFSET_DELTA:
1167 case GOT_OBJ_TYPE_REF_DELTA:
1168 err = open_delta_object(obj, packidx, pack, id, offset,
1169 tslen, type, size, idx);
1172 err = got_error(GOT_ERR_OBJ_TYPE);
1179 const struct got_error *
1180 got_pack_get_delta_chain_max_size(uint64_t *max_size,
1181 struct got_delta_chain *deltas, struct got_pack *pack)
1183 struct got_delta *delta;
1184 uint64_t base_size = 0, result_size = 0;
1187 STAILQ_FOREACH(delta, &deltas->entries, entry) {
1188 /* Plain object types are the delta base. */
1189 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1190 delta->type != GOT_OBJ_TYPE_TREE &&
1191 delta->type != GOT_OBJ_TYPE_BLOB &&
1192 delta->type != GOT_OBJ_TYPE_TAG) {
1193 const struct got_error *err;
1198 got_delta_cache_get(&delta_buf, &delta_len,
1199 pack->delta_cache, delta->data_offset);
1200 if (delta_buf == NULL) {
1202 err = read_delta_data(&delta_buf, &delta_len,
1203 delta->data_offset, pack);
1206 err = got_delta_cache_add(pack->delta_cache,
1207 delta->data_offset, delta_buf, delta_len);
1210 else if (err->code != GOT_ERR_NO_SPACE) {
1215 err = got_delta_get_sizes(&base_size, &result_size,
1216 delta_buf, delta_len);
1222 base_size = delta->size;
1223 if (base_size > *max_size)
1224 *max_size = base_size;
1225 if (result_size > *max_size)
1226 *max_size = result_size;
1232 const struct got_error *
1233 got_pack_get_max_delta_object_size(uint64_t *size, struct got_object *obj,
1234 struct got_pack *pack)
1236 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0)
1237 return got_error(GOT_ERR_OBJ_TYPE);
1239 return got_pack_get_delta_chain_max_size(size, &obj->deltas, pack);
1242 const struct got_error *
1243 got_pack_dump_delta_chain_to_file(size_t *result_size,
1244 struct got_delta_chain *deltas, struct got_pack *pack, FILE *outfile,
1245 FILE *base_file, FILE *accum_file)
1247 const struct got_error *err = NULL;
1248 struct got_delta *delta;
1249 uint8_t *base_buf = NULL, *accum_buf = NULL, *delta_buf;
1250 size_t base_bufsz = 0, accum_size = 0, delta_len;
1256 if (STAILQ_EMPTY(&deltas->entries))
1257 return got_error(GOT_ERR_BAD_DELTA_CHAIN);
1259 /* We process small enough files entirely in memory for speed. */
1260 err = got_pack_get_delta_chain_max_size(&max_size, deltas, pack);
1263 if (max_size < GOT_DELTA_RESULT_SIZE_CACHED_MAX) {
1264 accum_buf = malloc(max_size);
1265 if (accum_buf == NULL)
1266 return got_error_from_errno("malloc");
1270 if (fseeko(base_file, 0L, SEEK_SET) == -1)
1271 return got_error_from_errno("fseeko");
1272 if (fseeko(accum_file, 0L, SEEK_SET) == -1)
1273 return got_error_from_errno("fseeko");
1276 /* Deltas are ordered in ascending order. */
1277 STAILQ_FOREACH(delta, &deltas->entries, entry) {
1281 off_t delta_data_offset;
1283 /* Plain object types are the delta base. */
1284 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1285 delta->type != GOT_OBJ_TYPE_TREE &&
1286 delta->type != GOT_OBJ_TYPE_BLOB &&
1287 delta->type != GOT_OBJ_TYPE_TAG) {
1288 err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1292 delta_data_offset = delta->offset + delta->tslen;
1293 if (delta_data_offset >= pack->filesize) {
1294 err = got_error(GOT_ERR_PACK_OFFSET);
1297 if (pack->map == NULL) {
1298 if (lseek(pack->fd, delta_data_offset, SEEK_SET)
1300 err = got_error_from_errno("lseek");
1306 mapoff = (size_t)delta_data_offset;
1307 err = got_inflate_to_file_mmap(
1308 &base_bufsz, NULL, NULL, pack->map,
1309 mapoff, pack->filesize - mapoff,
1312 err = got_inflate_to_file_fd(
1313 &base_bufsz, NULL, NULL, pack->fd,
1317 mapoff = (size_t)delta_data_offset;
1318 err = got_inflate_to_mem_mmap(&base_buf,
1319 &base_bufsz, NULL, NULL,
1321 pack->filesize - mapoff);
1323 err = got_inflate_to_mem_fd(&base_buf,
1324 &base_bufsz, NULL, NULL, max_size,
1335 got_delta_cache_get(&delta_buf, &delta_len,
1336 pack->delta_cache, delta->data_offset);
1337 if (delta_buf == NULL) {
1339 err = read_delta_data(&delta_buf, &delta_len,
1340 delta->data_offset, pack);
1343 err = got_delta_cache_add(pack->delta_cache,
1344 delta->data_offset, delta_buf, delta_len);
1347 else if (err->code != GOT_ERR_NO_SPACE) {
1353 err = got_delta_apply_in_mem(base_buf, base_bufsz,
1354 delta_buf, delta_len, accum_buf,
1355 &accum_size, max_size);
1358 err = got_delta_apply(base_file, delta_buf,
1360 /* Final delta application writes to output file. */
1361 ++n < deltas->nentries ? accum_file : outfile,
1369 if (n < deltas->nentries) {
1370 /* Accumulated delta becomes the new base. */
1372 uint8_t *tmp = accum_buf;
1374 * Base buffer switches roles with accumulation
1375 * buffer. Ensure it can hold the largest
1376 * result in the delta chain. The initial
1377 * allocation might have been smaller.
1379 if (base_bufsz < max_size) {
1381 p = reallocarray(base_buf, 1, max_size);
1383 err = got_error_from_errno(
1388 base_bufsz = max_size;
1390 accum_buf = base_buf;
1393 FILE *tmp = accum_file;
1394 accum_file = base_file;
1405 size_t len = fwrite(accum_buf, 1, accum_size, outfile);
1407 if (len != accum_size)
1408 err = got_ferror(outfile, GOT_ERR_IO);
1412 *result_size = accum_size;
1416 const struct got_error *
1417 got_pack_dump_delta_chain_to_mem(uint8_t **outbuf, size_t *outlen,
1418 struct got_delta_chain *deltas, struct got_pack *pack)
1420 const struct got_error *err = NULL;
1421 struct got_delta *delta;
1422 uint8_t *base_buf = NULL, *accum_buf = NULL, *delta_buf;
1423 size_t base_bufsz = 0, accum_size = 0, delta_len;
1430 if (STAILQ_EMPTY(&deltas->entries))
1431 return got_error(GOT_ERR_BAD_DELTA_CHAIN);
1433 err = got_pack_get_delta_chain_max_size(&max_size, deltas, pack);
1436 accum_buf = malloc(max_size);
1437 if (accum_buf == NULL)
1438 return got_error_from_errno("malloc");
1440 /* Deltas are ordered in ascending order. */
1441 STAILQ_FOREACH(delta, &deltas->entries, entry) {
1444 size_t delta_data_offset;
1446 /* Plain object types are the delta base. */
1447 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1448 delta->type != GOT_OBJ_TYPE_TREE &&
1449 delta->type != GOT_OBJ_TYPE_BLOB &&
1450 delta->type != GOT_OBJ_TYPE_TAG) {
1451 err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1455 delta_data_offset = delta->offset + delta->tslen;
1456 if (delta_data_offset >= pack->filesize) {
1457 err = got_error(GOT_ERR_PACK_OFFSET);
1461 size_t mapoff = (size_t)delta_data_offset;
1462 err = got_inflate_to_mem_mmap(&base_buf,
1463 &base_bufsz, NULL, NULL, pack->map,
1464 mapoff, pack->filesize - mapoff);
1466 if (lseek(pack->fd, delta_data_offset, SEEK_SET)
1468 err = got_error_from_errno("lseek");
1471 err = got_inflate_to_mem_fd(&base_buf,
1472 &base_bufsz, NULL, NULL, max_size,
1481 got_delta_cache_get(&delta_buf, &delta_len,
1482 pack->delta_cache, delta->data_offset);
1483 if (delta_buf == NULL) {
1485 err = read_delta_data(&delta_buf, &delta_len,
1486 delta->data_offset, pack);
1489 err = got_delta_cache_add(pack->delta_cache,
1490 delta->data_offset, delta_buf, delta_len);
1493 else if (err->code != GOT_ERR_NO_SPACE) {
1498 err = got_delta_apply_in_mem(base_buf, base_bufsz,
1499 delta_buf, delta_len, accum_buf,
1500 &accum_size, max_size);
1507 if (n < deltas->nentries) {
1508 /* Accumulated delta becomes the new base. */
1509 uint8_t *tmp = accum_buf;
1511 * Base buffer switches roles with accumulation buffer.
1512 * Ensure it can hold the largest result in the delta
1513 * chain. Initial allocation might have been smaller.
1515 if (base_bufsz < max_size) {
1517 p = reallocarray(base_buf, 1, max_size);
1519 err = got_error_from_errno(
1524 base_bufsz = max_size;
1526 accum_buf = base_buf;
1538 *outbuf = accum_buf;
1539 *outlen = accum_size;
1544 const struct got_error *
1545 got_packfile_extract_object(struct got_pack *pack, struct got_object *obj,
1546 FILE *outfile, FILE *base_file, FILE *accum_file)
1548 const struct got_error *err = NULL;
1550 if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
1551 return got_error(GOT_ERR_OBJ_NOT_PACKED);
1553 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0) {
1554 if (obj->pack_offset >= pack->filesize)
1555 return got_error(GOT_ERR_PACK_OFFSET);
1558 size_t mapoff = (size_t)obj->pack_offset;
1559 err = got_inflate_to_file_mmap(&obj->size, NULL, NULL,
1560 pack->map, mapoff, pack->filesize - mapoff,
1563 if (lseek(pack->fd, obj->pack_offset, SEEK_SET) == -1)
1564 return got_error_from_errno("lseek");
1565 err = got_inflate_to_file_fd(&obj->size, NULL, NULL,
1569 err = got_pack_dump_delta_chain_to_file(&obj->size,
1570 &obj->deltas, pack, outfile, base_file, accum_file);
1575 const struct got_error *
1576 got_packfile_extract_object_to_mem(uint8_t **buf, size_t *len,
1577 struct got_object *obj, struct got_pack *pack)
1579 const struct got_error *err = NULL;
1581 if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
1582 return got_error(GOT_ERR_OBJ_NOT_PACKED);
1584 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0) {
1585 if (obj->pack_offset >= pack->filesize)
1586 return got_error(GOT_ERR_PACK_OFFSET);
1588 size_t mapoff = (size_t)obj->pack_offset;
1589 err = got_inflate_to_mem_mmap(buf, len, NULL, NULL,
1590 pack->map, mapoff, pack->filesize - mapoff);
1592 if (lseek(pack->fd, obj->pack_offset, SEEK_SET) == -1)
1593 return got_error_from_errno("lseek");
1594 err = got_inflate_to_mem_fd(buf, len, NULL, NULL,
1595 obj->size, pack->fd);
1598 err = got_pack_dump_delta_chain_to_mem(buf, len, &obj->deltas,
1604 const struct got_error *
1605 got_packfile_extract_raw_delta(uint8_t **delta_buf, size_t *delta_size,
1606 off_t *delta_offset, off_t *base_offset, struct got_object_id *base_id,
1607 uint64_t *base_size, uint64_t *result_size, struct got_pack *pack,
1608 struct got_packidx *packidx, int idx)
1610 const struct got_error *err = NULL;
1614 size_t tslen, delta_hdrlen;
1623 offset = got_packidx_get_object_offset(packidx, idx);
1624 if (offset == (uint64_t)-1)
1625 return got_error(GOT_ERR_BAD_PACKIDX);
1627 if (offset >= pack->filesize)
1628 return got_error(GOT_ERR_PACK_OFFSET);
1630 err = got_pack_parse_object_type_and_size(&type, &size, &tslen,
1635 if (tslen + size < tslen || offset + size < size ||
1636 tslen + offset < tslen)
1637 return got_error(GOT_ERR_PACK_OFFSET);
1640 case GOT_OBJ_TYPE_OFFSET_DELTA:
1641 err = got_pack_parse_offset_delta(base_offset, &delta_hdrlen,
1642 pack, offset, tslen);
1646 case GOT_OBJ_TYPE_REF_DELTA:
1647 err = got_pack_parse_ref_delta(base_id, pack, offset, tslen);
1650 delta_hdrlen = SHA1_DIGEST_LENGTH;
1653 return got_error_fmt(GOT_ERR_OBJ_TYPE,
1654 "non-delta object type %d found at offset %llu",
1658 if (tslen + delta_hdrlen < delta_hdrlen ||
1659 offset + delta_hdrlen < delta_hdrlen)
1660 return got_error(GOT_ERR_BAD_DELTA);
1662 err = read_delta_data(delta_buf, delta_size,
1663 offset + tslen + delta_hdrlen, pack);
1667 if (*delta_size != size) {
1668 err = got_error(GOT_ERR_BAD_DELTA);
1672 err = got_delta_get_sizes(base_size, result_size, *delta_buf, size);
1676 *delta_offset = offset;