2 * Copyright (c) 2018, 2019 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>
35 #include "got_error.h"
36 #include "got_object.h"
37 #include "got_opentemp.h"
40 #include "got_lib_sha1.h"
41 #include "got_lib_delta.h"
42 #include "got_lib_inflate.h"
43 #include "got_lib_object.h"
44 #include "got_lib_privsep.h"
45 #include "got_lib_pack.h"
48 #define nitems(_a) (sizeof(_a) / sizeof((_a)[0]))
52 #define MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
55 static const struct got_error *
56 verify_fanout_table(uint32_t *fanout_table)
60 for (i = 0; i < 0xff - 1; i++) {
61 if (be32toh(fanout_table[i]) > be32toh(fanout_table[i + 1]))
62 return got_error(GOT_ERR_BAD_PACKIDX);
68 const struct got_error *
69 got_packidx_init_hdr(struct got_packidx *p, int verify)
71 const struct got_error *err = NULL;
72 struct got_packidx_v2_hdr *h;
74 uint8_t sha1[SHA1_DIGEST_LENGTH];
75 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");
99 else if (n != sizeof(*h->magic)) {
100 err = got_error(GOT_ERR_BAD_PACKIDX);
104 if (betoh32(*h->magic) != GOT_PACKIDX_V2_MAGIC) {
105 err = got_error(GOT_ERR_BAD_PACKIDX);
108 offset += sizeof(*h->magic);
109 remain -= sizeof(*h->magic);
112 SHA1Update(&ctx, (uint8_t *)h->magic, sizeof(*h->magic));
114 if (remain < sizeof(*h->version)) {
115 err = got_error(GOT_ERR_BAD_PACKIDX);
119 h->version = (uint32_t *)(p->map + offset);
121 h->version = malloc(sizeof(*h->version));
122 if (h->version == NULL) {
123 err = got_error_from_errno("malloc");
126 n = read(p->fd, h->version, sizeof(*h->version));
128 err = got_error_from_errno("read");
129 else if (n != sizeof(*h->version)) {
130 err = got_error(GOT_ERR_BAD_PACKIDX);
134 if (betoh32(*h->version) != GOT_PACKIDX_VERSION) {
135 err = got_error(GOT_ERR_BAD_PACKIDX);
138 offset += sizeof(*h->version);
139 remain -= sizeof(*h->version);
142 SHA1Update(&ctx, (uint8_t *)h->version, sizeof(*h->version));
145 sizeof(*h->fanout_table) * GOT_PACKIDX_V2_FANOUT_TABLE_ITEMS;
146 if (remain < len_fanout) {
147 err = got_error(GOT_ERR_BAD_PACKIDX);
151 h->fanout_table = (uint32_t *)(p->map + offset);
153 h->fanout_table = malloc(len_fanout);
154 if (h->fanout_table == NULL) {
155 err = got_error_from_errno("malloc");
158 n = read(p->fd, h->fanout_table, len_fanout);
160 err = got_error_from_errno("read");
161 else if (n != len_fanout) {
162 err = got_error(GOT_ERR_BAD_PACKIDX);
166 err = verify_fanout_table(h->fanout_table);
170 SHA1Update(&ctx, (uint8_t *)h->fanout_table, len_fanout);
171 offset += len_fanout;
172 remain -= len_fanout;
174 nobj = betoh32(h->fanout_table[0xff]);
175 len_ids = nobj * sizeof(*h->sorted_ids);
176 if (len_ids <= nobj || len_ids > remain) {
177 err = got_error(GOT_ERR_BAD_PACKIDX);
182 (struct got_packidx_object_id *)((uint8_t*)(p->map + offset));
184 h->sorted_ids = malloc(len_ids);
185 if (h->sorted_ids == NULL) {
186 err = got_error(GOT_ERR_BAD_PACKIDX);
189 n = read(p->fd, h->sorted_ids, len_ids);
191 err = got_error_from_errno("read");
192 else if (n != len_ids) {
193 err = got_error(GOT_ERR_BAD_PACKIDX);
198 SHA1Update(&ctx, (uint8_t *)h->sorted_ids, len_ids);
202 if (remain < nobj * sizeof(*h->crc32)) {
203 err = got_error(GOT_ERR_BAD_PACKIDX);
207 h->crc32 = (uint32_t *)((uint8_t*)(p->map + offset));
209 h->crc32 = malloc(nobj * sizeof(*h->crc32));
210 if (h->crc32 == NULL) {
211 err = got_error_from_errno("malloc");
214 n = read(p->fd, h->crc32, nobj * sizeof(*h->crc32));
216 err = got_error_from_errno("read");
217 else if (n != nobj * sizeof(*h->crc32)) {
218 err = got_error(GOT_ERR_BAD_PACKIDX);
223 SHA1Update(&ctx, (uint8_t *)h->crc32, nobj * sizeof(*h->crc32));
224 remain -= nobj * sizeof(*h->crc32);
225 offset += nobj * sizeof(*h->crc32);
227 if (remain < nobj * sizeof(*h->offsets)) {
228 err = got_error(GOT_ERR_BAD_PACKIDX);
232 h->offsets = (uint32_t *)((uint8_t*)(p->map + offset));
234 h->offsets = malloc(nobj * sizeof(*h->offsets));
235 if (h->offsets == NULL) {
236 err = got_error_from_errno("malloc");
239 n = read(p->fd, h->offsets, nobj * sizeof(*h->offsets));
241 err = got_error_from_errno("read");
242 else if (n != nobj * sizeof(*h->offsets)) {
243 err = got_error(GOT_ERR_BAD_PACKIDX);
248 SHA1Update(&ctx, (uint8_t *)h->offsets,
249 nobj * sizeof(*h->offsets));
250 remain -= nobj * sizeof(*h->offsets);
251 offset += nobj * sizeof(*h->offsets);
253 /* Large file offsets are contained only in files > 2GB. */
254 if (p->len <= 0x80000000)
257 if (remain < nobj * sizeof(*h->large_offsets)) {
258 err = got_error(GOT_ERR_BAD_PACKIDX);
262 h->large_offsets = (uint64_t *)((uint8_t*)(p->map + offset));
264 h->offsets = malloc(nobj * sizeof(*h->large_offsets));
265 if (h->offsets == NULL) {
266 err = got_error_from_errno("malloc");
269 n = read(p->fd, h->large_offsets,
270 nobj * sizeof(*h->large_offsets));
272 err = got_error_from_errno("read");
273 else if (n != nobj * sizeof(*h->large_offsets)) {
274 err = got_error(GOT_ERR_BAD_PACKIDX);
279 SHA1Update(&ctx, (uint8_t*)h->large_offsets,
280 nobj * sizeof(*h->large_offsets));
281 remain -= nobj * sizeof(*h->large_offsets);
282 offset += nobj * sizeof(*h->large_offsets);
285 if (remain < sizeof(*h->trailer)) {
286 err = got_error(GOT_ERR_BAD_PACKIDX);
291 (struct got_packidx_trailer *)((uint8_t*)(p->map + offset));
293 h->trailer = malloc(sizeof(*h->trailer));
294 if (h->trailer == NULL) {
295 err = got_error_from_errno("malloc");
298 n = read(p->fd, h->trailer, sizeof(*h->trailer));
300 err = got_error_from_errno("read");
301 else if (n != sizeof(*h->trailer)) {
302 err = got_error(GOT_ERR_BAD_PACKIDX);
307 SHA1Update(&ctx, h->trailer->packfile_sha1, SHA1_DIGEST_LENGTH);
308 SHA1Final(sha1, &ctx);
309 if (memcmp(h->trailer->packidx_sha1, sha1,
310 SHA1_DIGEST_LENGTH) != 0)
311 err = got_error(GOT_ERR_PACKIDX_CSUM);
317 const struct got_error *
318 got_packidx_open(struct got_packidx **packidx, const char *path, int verify)
320 const struct got_error *err = NULL;
321 struct got_packidx *p;
326 p = calloc(1, sizeof(*p));
328 return got_error_from_errno("calloc");
330 p->fd = open(path, O_RDONLY | O_NOFOLLOW);
332 return got_error_from_errno2("open", path);
334 if (fstat(p->fd, &sb) != 0) {
335 err = got_error_from_errno2("fstat", path);
341 if (p->len < sizeof(p->hdr)) {
342 err = got_error(GOT_ERR_BAD_PACKIDX);
348 p->path_packidx = strdup(path);
349 if (p->path_packidx == NULL) {
350 err = got_error_from_errno("strdup");
354 #ifndef GOT_PACK_NO_MMAP
355 p->map = mmap(NULL, p->len, PROT_READ, MAP_PRIVATE, p->fd, 0);
356 if (p->map == MAP_FAILED) {
357 if (errno != ENOMEM) {
358 err = got_error_from_errno("mmap");
361 p->map = NULL; /* fall back to read(2) */
365 err = got_packidx_init_hdr(p, verify);
368 got_packidx_close(p);
375 const struct got_error *
376 got_packidx_close(struct got_packidx *packidx)
378 const struct got_error *err = NULL;
380 free(packidx->path_packidx);
382 if (munmap(packidx->map, packidx->len) == -1)
383 err = got_error_from_errno("munmap");
385 free(packidx->hdr.magic);
386 free(packidx->hdr.version);
387 free(packidx->hdr.fanout_table);
388 free(packidx->hdr.sorted_ids);
389 free(packidx->hdr.crc32);
390 free(packidx->hdr.offsets);
391 free(packidx->hdr.large_offsets);
392 free(packidx->hdr.trailer);
394 if (close(packidx->fd) != 0 && err == NULL)
395 err = got_error_from_errno("close");
402 get_object_offset(struct got_packidx *packidx, int idx)
404 uint32_t totobj = betoh32(packidx->hdr.fanout_table[0xff]);
405 uint32_t offset = betoh32(packidx->hdr.offsets[idx]);
406 if (offset & GOT_PACKIDX_OFFSET_VAL_IS_LARGE_IDX) {
408 idx = offset & GOT_PACKIDX_OFFSET_VAL_MASK;
409 if (idx < 0 || idx > totobj ||
410 packidx->hdr.large_offsets == NULL)
412 loffset = betoh64(packidx->hdr.large_offsets[idx]);
413 return (loffset > INT64_MAX ? -1 : (off_t)loffset);
415 return (off_t)(offset & GOT_PACKIDX_OFFSET_VAL_MASK);
419 got_packidx_get_object_idx(struct got_packidx *packidx, struct got_object_id *id)
421 u_int8_t id0 = id->sha1[0];
422 uint32_t totobj = betoh32(packidx->hdr.fanout_table[0xff]);
423 int left = 0, right = totobj - 1;
426 left = betoh32(packidx->hdr.fanout_table[id0 - 1]);
428 while (left <= right) {
429 struct got_packidx_object_id *oid;
432 i = ((left + right) / 2);
433 oid = &packidx->hdr.sorted_ids[i];
434 cmp = memcmp(id->sha1, oid->sha1, SHA1_DIGEST_LENGTH);
446 const struct got_error *
447 got_pack_stop_privsep_child(struct got_pack *pack)
449 const struct got_error *err = NULL;
451 if (pack->privsep_child == NULL)
454 err = got_privsep_send_stop(pack->privsep_child->imsg_fd);
457 err = got_privsep_wait_for_child(pack->privsep_child->pid);
458 if (close(pack->privsep_child->imsg_fd) != 0 && err == NULL)
459 err = got_error_from_errno("close");
460 free(pack->privsep_child);
461 pack->privsep_child = NULL;
465 const struct got_error *
466 got_pack_close(struct got_pack *pack)
468 const struct got_error *err = NULL;
470 err = got_pack_stop_privsep_child(pack);
471 if (pack->map && munmap(pack->map, pack->filesize) == -1 && !err)
472 err = got_error_from_errno("munmap");
473 if (pack->fd != -1 && close(pack->fd) != 0 && err == NULL)
474 err = got_error_from_errno("close");
476 free(pack->path_packfile);
477 pack->path_packfile = NULL;
483 static const struct got_error *
484 parse_object_type_and_size(uint8_t *type, uint64_t *size, size_t *len,
485 struct got_pack *pack, off_t offset)
495 if (offset >= pack->filesize)
496 return got_error(GOT_ERR_PACK_OFFSET);
499 mapoff = (size_t)offset;
501 if (lseek(pack->fd, offset, SEEK_SET) == -1)
502 return got_error_from_errno("lseek");
506 /* We do not support size values which don't fit in 64 bit. */
508 return got_error(GOT_ERR_NO_SPACE);
511 sizeN = *(pack->map + mapoff);
512 mapoff += sizeof(sizeN);
514 ssize_t n = read(pack->fd, &sizeN, sizeof(sizeN));
516 return got_error_from_errno("read");
517 if (n != sizeof(sizeN))
518 return got_error(GOT_ERR_BAD_PACKFILE);
520 *len += sizeof(sizeN);
523 t = (sizeN & GOT_PACK_OBJ_SIZE0_TYPE_MASK) >>
524 GOT_PACK_OBJ_SIZE0_TYPE_MASK_SHIFT;
525 s = (sizeN & GOT_PACK_OBJ_SIZE0_VAL_MASK);
527 size_t shift = 4 + 7 * (i - 1);
528 s |= ((sizeN & GOT_PACK_OBJ_SIZE_VAL_MASK) << shift);
531 } while (sizeN & GOT_PACK_OBJ_SIZE_MORE);
538 static const struct got_error *
539 open_plain_object(struct got_object **obj, const char *path_packfile,
540 struct got_object_id *id, uint8_t type, off_t offset, size_t size, int idx)
542 *obj = calloc(1, sizeof(**obj));
544 return got_error_from_errno("calloc");
546 (*obj)->path_packfile = strdup(path_packfile);
547 if ((*obj)->path_packfile == NULL) {
548 const struct got_error *err = got_error_from_errno("strdup");
555 (*obj)->flags = GOT_OBJ_FLAG_PACKED;
556 (*obj)->pack_idx = idx;
559 memcpy(&(*obj)->id, id, sizeof((*obj)->id));
560 (*obj)->pack_offset = offset;
565 static const struct got_error *
566 parse_negative_offset(int64_t *offset, size_t *len, struct got_pack *pack,
576 /* We do not support offset values which don't fit in 64 bit. */
578 return got_error(GOT_ERR_NO_SPACE);
582 if (delta_offset >= pack->filesize)
583 return got_error(GOT_ERR_PACK_OFFSET);
584 mapoff = (size_t)delta_offset + *len;
585 offN = *(pack->map + mapoff);
588 n = read(pack->fd, &offN, sizeof(offN));
590 return got_error_from_errno("read");
591 if (n != sizeof(offN))
592 return got_error(GOT_ERR_BAD_PACKFILE);
594 *len += sizeof(offN);
597 o = (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
601 o += (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
604 } while (offN & GOT_PACK_OBJ_DELTA_OFF_MORE);
610 static const struct got_error *
611 parse_offset_delta(off_t *base_offset, size_t *len, struct got_pack *pack,
612 off_t offset, int tslen)
614 const struct got_error *err;
620 err = parse_negative_offset(&negoffset, &negofflen, pack,
625 /* Compute the base object's offset (must be in the same pack file). */
626 *base_offset = (offset - negoffset);
627 if (*base_offset <= 0)
628 return got_error(GOT_ERR_BAD_PACKFILE);
634 static const struct got_error *
635 resolve_delta_chain(struct got_delta_chain *, struct got_packidx *,
636 struct got_pack *, off_t, size_t, int, size_t, unsigned int);
638 static const struct got_error *
639 add_delta(struct got_delta_chain *deltas, off_t delta_offset, size_t tslen,
640 int delta_type, size_t delta_size, size_t delta_data_offset,
641 uint8_t *delta_buf, size_t delta_len)
643 struct got_delta *delta;
645 delta = got_delta_open(delta_offset, tslen, delta_type, delta_size,
646 delta_data_offset, delta_buf,
649 return got_error_from_errno("got_delta_open");
650 /* delta is freed in got_object_close() */
652 SIMPLEQ_INSERT_HEAD(&deltas->entries, delta, entry);
656 static const struct got_error *
657 resolve_offset_delta(struct got_delta_chain *deltas,
658 struct got_packidx *packidx, struct got_pack *pack, off_t delta_offset,
659 size_t tslen, int delta_type, size_t delta_size, unsigned int recursion)
662 const struct got_error *err;
667 off_t delta_data_offset;
669 size_t delta_len, consumed;
671 err = parse_offset_delta(&base_offset, &consumed, pack,
672 delta_offset, tslen);
676 delta_data_offset = delta_offset + tslen + consumed;
677 if (delta_data_offset >= pack->filesize)
678 return got_error(GOT_ERR_PACK_OFFSET);
680 if (pack->map == NULL) {
681 delta_data_offset = lseek(pack->fd, 0, SEEK_CUR);
682 if (delta_data_offset == -1)
683 return got_error_from_errno("lseek");
687 size_t mapoff = (size_t)delta_data_offset;
688 err = got_inflate_to_mem_mmap(&delta_buf, &delta_len, pack->map,
689 mapoff, pack->filesize - mapoff);
694 err = got_inflate_to_mem_fd(&delta_buf, &delta_len, pack->fd);
699 err = add_delta(deltas, delta_offset, tslen, delta_type, delta_size,
700 delta_data_offset, delta_buf, delta_len);
704 /* An offset delta must be in the same packfile. */
705 if (base_offset >= pack->filesize)
706 return got_error(GOT_ERR_PACK_OFFSET);
708 err = parse_object_type_and_size(&base_type, &base_size, &base_tslen,
713 return resolve_delta_chain(deltas, packidx, pack, base_offset,
714 base_tslen, base_type, base_size, recursion - 1);
717 static const struct got_error *
718 resolve_ref_delta(struct got_delta_chain *deltas, struct got_packidx *packidx,
719 struct got_pack *pack, off_t delta_offset, size_t tslen, int delta_type,
720 size_t delta_size, unsigned int recursion)
722 const struct got_error *err;
723 struct got_object_id id;
729 off_t delta_data_offset;
733 if (delta_offset >= pack->filesize)
734 return got_error(GOT_ERR_PACK_OFFSET);
735 delta_data_offset = delta_offset + tslen;
736 if (delta_data_offset >= pack->filesize)
737 return got_error(GOT_ERR_PACK_OFFSET);
739 if (pack->map == NULL) {
740 delta_data_offset = lseek(pack->fd, 0, SEEK_CUR);
741 if (delta_data_offset == -1)
742 return got_error_from_errno("lseek");
746 size_t mapoff = (size_t)delta_data_offset;
747 memcpy(&id, pack->map + mapoff, sizeof(id));
748 mapoff += sizeof(id);
749 err = got_inflate_to_mem_mmap(&delta_buf, &delta_len, pack->map,
750 mapoff, pack->filesize - mapoff);
754 ssize_t n = read(pack->fd, &id, sizeof(id));
756 return got_error_from_errno("read");
758 return got_error(GOT_ERR_BAD_PACKFILE);
759 err = got_inflate_to_mem_fd(&delta_buf, &delta_len, pack->fd);
764 err = add_delta(deltas, delta_offset, tslen, delta_type, delta_size,
765 delta_data_offset, delta_buf, delta_len);
769 /* Delta base must be in the same pack file. */
770 idx = got_packidx_get_object_idx(packidx, &id);
772 return got_error(GOT_ERR_BAD_PACKFILE);
774 base_offset = get_object_offset(packidx, idx);
775 if (base_offset == (uint64_t)-1)
776 return got_error(GOT_ERR_BAD_PACKIDX);
778 if (base_offset >= pack->filesize)
779 return got_error(GOT_ERR_PACK_OFFSET);
781 err = parse_object_type_and_size(&base_type, &base_size, &base_tslen,
786 return resolve_delta_chain(deltas, packidx, pack, base_offset,
787 base_tslen, base_type, base_size, recursion - 1);
790 static const struct got_error *
791 resolve_delta_chain(struct got_delta_chain *deltas, struct got_packidx *packidx,
792 struct got_pack *pack, off_t delta_offset, size_t tslen, int delta_type,
793 size_t delta_size, unsigned int recursion)
795 const struct got_error *err = NULL;
797 if (--recursion == 0)
798 return got_error(GOT_ERR_RECURSION);
800 switch (delta_type) {
801 case GOT_OBJ_TYPE_COMMIT:
802 case GOT_OBJ_TYPE_TREE:
803 case GOT_OBJ_TYPE_BLOB:
804 case GOT_OBJ_TYPE_TAG:
805 /* Plain types are the final delta base. Recursion ends. */
806 err = add_delta(deltas, delta_offset, tslen, delta_type,
807 delta_size, 0, NULL, 0);
809 case GOT_OBJ_TYPE_OFFSET_DELTA:
810 err = resolve_offset_delta(deltas, packidx, pack,
811 delta_offset, tslen, delta_type, delta_size, recursion - 1);
813 case GOT_OBJ_TYPE_REF_DELTA:
814 err = resolve_ref_delta(deltas, packidx, pack,
815 delta_offset, tslen, delta_type, delta_size, recursion - 1);
818 return got_error(GOT_ERR_OBJ_TYPE);
824 static const struct got_error *
825 open_delta_object(struct got_object **obj, struct got_packidx *packidx,
826 struct got_pack *pack, struct got_object_id *id, off_t offset,
827 size_t tslen, int delta_type, size_t delta_size, int idx)
829 const struct got_error *err = NULL;
832 *obj = calloc(1, sizeof(**obj));
834 return got_error_from_errno("calloc");
838 (*obj)->size = 0; /* Not known because deltas aren't applied yet. */
839 memcpy(&(*obj)->id, id, sizeof((*obj)->id));
840 (*obj)->pack_offset = offset + tslen;
842 SIMPLEQ_INIT(&(*obj)->deltas.entries);
843 (*obj)->flags |= GOT_OBJ_FLAG_DELTIFIED;
845 (*obj)->path_packfile = strdup(pack->path_packfile);
846 if ((*obj)->path_packfile == NULL) {
847 err = got_error_from_errno("strdup");
850 (*obj)->flags |= GOT_OBJ_FLAG_PACKED;
851 (*obj)->pack_idx = idx;
853 err = resolve_delta_chain(&(*obj)->deltas, packidx, pack, offset,
854 tslen, delta_type, delta_size, GOT_DELTA_CHAIN_RECURSION_MAX);
858 err = got_delta_chain_get_base_type(&resolved_type, &(*obj)->deltas);
861 (*obj)->type = resolved_type;
864 got_object_close(*obj);
870 const struct got_error *
871 got_packfile_open_object(struct got_object **obj, struct got_pack *pack,
872 struct got_packidx *packidx, int idx, struct got_object_id *id)
874 const struct got_error *err = NULL;
882 offset = get_object_offset(packidx, idx);
883 if (offset == (uint64_t)-1)
884 return got_error(GOT_ERR_BAD_PACKIDX);
886 err = parse_object_type_and_size(&type, &size, &tslen, pack, offset);
891 case GOT_OBJ_TYPE_COMMIT:
892 case GOT_OBJ_TYPE_TREE:
893 case GOT_OBJ_TYPE_BLOB:
894 case GOT_OBJ_TYPE_TAG:
895 err = open_plain_object(obj, pack->path_packfile, id, type,
896 offset + tslen, size, idx);
898 case GOT_OBJ_TYPE_OFFSET_DELTA:
899 case GOT_OBJ_TYPE_REF_DELTA:
900 err = open_delta_object(obj, packidx, pack, id, offset,
901 tslen, type, size, idx);
904 err = got_error(GOT_ERR_OBJ_TYPE);
911 static const struct got_error *
912 get_delta_chain_max_size(uint64_t *max_size, struct got_delta_chain *deltas)
914 struct got_delta *delta;
915 uint64_t base_size = 0, result_size = 0;
918 SIMPLEQ_FOREACH(delta, &deltas->entries, entry) {
919 /* Plain object types are the delta base. */
920 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
921 delta->type != GOT_OBJ_TYPE_TREE &&
922 delta->type != GOT_OBJ_TYPE_BLOB &&
923 delta->type != GOT_OBJ_TYPE_TAG) {
924 const struct got_error *err;
925 err = got_delta_get_sizes(&base_size, &result_size,
926 delta->delta_buf, delta->delta_len);
930 base_size = delta->size;
931 if (base_size > *max_size)
932 *max_size = base_size;
933 if (result_size > *max_size)
934 *max_size = result_size;
940 const struct got_error *
941 got_pack_get_max_delta_object_size(uint64_t *size, struct got_object *obj)
943 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0)
944 return got_error(GOT_ERR_OBJ_TYPE);
946 return get_delta_chain_max_size(size, &obj->deltas);
949 static const struct got_error *
950 dump_delta_chain_to_file(size_t *result_size, struct got_delta_chain *deltas,
951 struct got_pack *pack, FILE *outfile, FILE *base_file, FILE *accum_file)
953 const struct got_error *err = NULL;
954 struct got_delta *delta;
955 uint8_t *base_buf = NULL, *accum_buf = NULL;
956 size_t base_bufsz = 0, accum_size = 0;
962 if (SIMPLEQ_EMPTY(&deltas->entries))
963 return got_error(GOT_ERR_BAD_DELTA_CHAIN);
965 /* We process small enough files entirely in memory for speed. */
966 err = get_delta_chain_max_size(&max_size, deltas);
969 if (max_size < GOT_DELTA_RESULT_SIZE_CACHED_MAX) {
970 accum_buf = malloc(max_size);
971 if (accum_buf == NULL)
972 return got_error_from_errno("malloc");
977 /* Deltas are ordered in ascending order. */
978 SIMPLEQ_FOREACH(delta, &deltas->entries, entry) {
981 off_t delta_data_offset;
983 /* Plain object types are the delta base. */
984 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
985 delta->type != GOT_OBJ_TYPE_TREE &&
986 delta->type != GOT_OBJ_TYPE_BLOB &&
987 delta->type != GOT_OBJ_TYPE_TAG) {
988 err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
992 delta_data_offset = delta->offset + delta->tslen;
993 if (delta_data_offset >= pack->filesize) {
994 err = got_error(GOT_ERR_PACK_OFFSET);
997 if (pack->map == NULL) {
998 if (lseek(pack->fd, delta_data_offset, SEEK_SET)
1000 err = got_error_from_errno("lseek");
1006 mapoff = (size_t)delta_data_offset;
1007 err = got_inflate_to_file_mmap(
1008 &base_bufsz, pack->map, mapoff,
1009 pack->filesize - mapoff, base_file);
1011 err = got_inflate_to_file_fd(
1012 &base_bufsz, pack->fd, base_file);
1015 mapoff = (size_t)delta_data_offset;
1016 err = got_inflate_to_mem_mmap(&base_buf,
1017 &base_bufsz, pack->map, mapoff,
1018 pack->filesize - mapoff);
1020 err = got_inflate_to_mem_fd(&base_buf,
1021 &base_bufsz, pack->fd);
1032 err = got_delta_apply_in_mem(base_buf, base_bufsz,
1033 delta->delta_buf, delta->delta_len, accum_buf,
1034 &accum_size, max_size);
1037 err = got_delta_apply(base_file, delta->delta_buf,
1039 /* Final delta application writes to output file. */
1040 ++n < deltas->nentries ? accum_file : outfile,
1046 if (n < deltas->nentries) {
1047 /* Accumulated delta becomes the new base. */
1049 uint8_t *tmp = accum_buf;
1051 * Base buffer switches roles with accumulation
1052 * buffer. Ensure it can hold the largest
1053 * result in the delta chain. The initial
1054 * allocation might have been smaller.
1056 if (base_bufsz < max_size) {
1058 p = reallocarray(base_buf, 1, max_size);
1060 err = got_error_from_errno(
1065 base_bufsz = max_size;
1067 accum_buf = base_buf;
1070 FILE *tmp = accum_file;
1071 accum_file = base_file;
1082 size_t len = fwrite(accum_buf, 1, accum_size, outfile);
1084 if (len != accum_size)
1085 err = got_ferror(outfile, GOT_ERR_IO);
1089 *result_size = accum_size;
1093 static const struct got_error *
1094 dump_delta_chain_to_mem(uint8_t **outbuf, size_t *outlen,
1095 struct got_delta_chain *deltas, struct got_pack *pack)
1097 const struct got_error *err = NULL;
1098 struct got_delta *delta;
1099 uint8_t *base_buf = NULL, *accum_buf = NULL;
1100 size_t base_bufsz = 0, accum_size = 0;
1107 if (SIMPLEQ_EMPTY(&deltas->entries))
1108 return got_error(GOT_ERR_BAD_DELTA_CHAIN);
1110 err = get_delta_chain_max_size(&max_size, deltas);
1113 accum_buf = malloc(max_size);
1114 if (accum_buf == NULL)
1115 return got_error_from_errno("malloc");
1117 /* Deltas are ordered in ascending order. */
1118 SIMPLEQ_FOREACH(delta, &deltas->entries, entry) {
1120 size_t delta_data_offset;
1122 /* Plain object types are the delta base. */
1123 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1124 delta->type != GOT_OBJ_TYPE_TREE &&
1125 delta->type != GOT_OBJ_TYPE_BLOB &&
1126 delta->type != GOT_OBJ_TYPE_TAG) {
1127 err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1131 delta_data_offset = delta->offset + delta->tslen;
1132 if (delta_data_offset >= pack->filesize) {
1133 err = got_error(GOT_ERR_PACK_OFFSET);
1137 size_t mapoff = (size_t)delta_data_offset;
1138 err = got_inflate_to_mem_mmap(&base_buf,
1139 &base_bufsz, pack->map, mapoff,
1140 pack->filesize - mapoff);
1142 if (lseek(pack->fd, delta_data_offset, SEEK_SET)
1144 err = got_error_from_errno("lseek");
1147 err = got_inflate_to_mem_fd(&base_buf,
1148 &base_bufsz, pack->fd);
1156 err = got_delta_apply_in_mem(base_buf, base_bufsz,
1157 delta->delta_buf, delta->delta_len, accum_buf,
1158 &accum_size, max_size);
1163 if (n < deltas->nentries) {
1164 /* Accumulated delta becomes the new base. */
1165 uint8_t *tmp = accum_buf;
1167 * Base buffer switches roles with accumulation buffer.
1168 * Ensure it can hold the largest result in the delta
1169 * chain. Initial allocation might have been smaller.
1171 if (base_bufsz < max_size) {
1173 p = reallocarray(base_buf, 1, max_size);
1175 err = got_error_from_errno(
1180 base_bufsz = max_size;
1182 accum_buf = base_buf;
1194 *outbuf = accum_buf;
1195 *outlen = accum_size;
1200 const struct got_error *
1201 got_packfile_extract_object(struct got_pack *pack, struct got_object *obj,
1202 FILE *outfile, FILE *base_file, FILE *accum_file)
1204 const struct got_error *err = NULL;
1206 if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
1207 return got_error(GOT_ERR_OBJ_NOT_PACKED);
1209 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0) {
1210 if (obj->pack_offset >= pack->filesize)
1211 return got_error(GOT_ERR_PACK_OFFSET);
1214 size_t mapoff = (size_t)obj->pack_offset;
1215 err = got_inflate_to_file_mmap(&obj->size, pack->map,
1216 mapoff, pack->filesize - mapoff, outfile);
1218 if (lseek(pack->fd, obj->pack_offset, SEEK_SET) == -1)
1219 return got_error_from_errno("lseek");
1220 err = got_inflate_to_file_fd(&obj->size, pack->fd,
1224 err = dump_delta_chain_to_file(&obj->size, &obj->deltas, pack,
1225 outfile, base_file, accum_file);
1230 const struct got_error *
1231 got_packfile_extract_object_to_mem(uint8_t **buf, size_t *len,
1232 struct got_object *obj, struct got_pack *pack)
1234 const struct got_error *err = NULL;
1236 if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
1237 return got_error(GOT_ERR_OBJ_NOT_PACKED);
1239 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0) {
1240 if (obj->pack_offset >= pack->filesize)
1241 return got_error(GOT_ERR_PACK_OFFSET);
1243 size_t mapoff = (size_t)obj->pack_offset;
1244 err = got_inflate_to_mem_mmap(buf, len, pack->map,
1245 mapoff, pack->filesize - mapoff);
1247 if (lseek(pack->fd, obj->pack_offset, SEEK_SET) == -1)
1248 return got_error_from_errno("lseek");
1249 err = got_inflate_to_mem_fd(buf, len, pack->fd);
1252 err = dump_delta_chain_to_mem(buf, len, &obj->deltas, pack);