2 * Copyright (c) 2020 Ori Bernstein
3 * Copyright (c) 2021 Stefan Sperling <stsp@openbsd.org>
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18 #include <sys/types.h>
19 #include <sys/queue.h>
32 #include "got_error.h"
33 #include "got_cancel.h"
34 #include "got_object.h"
35 #include "got_reference.h"
36 #include "got_repository_admin.h"
38 #include "got_lib_deltify.h"
39 #include "got_lib_delta.h"
40 #include "got_lib_object.h"
41 #include "got_lib_object_idset.h"
42 #include "got_lib_object_cache.h"
43 #include "got_lib_deflate.h"
44 #include "got_lib_pack.h"
45 #include "got_lib_privsep.h"
46 #include "got_lib_repository.h"
49 #define MAX(_a,_b) ((_a) > (_b) ? (_a) : (_b))
52 struct got_pack_meta {
53 struct got_object_id id;
58 /* The best delta we picked */
59 struct got_pack_meta *head;
60 struct got_pack_meta *prev;
61 struct got_delta_instruction *deltas;
65 /* Only used for delta window */
66 struct got_delta_table *dtab;
68 /* Only used for writing offset deltas */
72 struct got_pack_metavec {
73 struct got_pack_meta **meta;
78 static const struct got_error *
79 alloc_meta(struct got_pack_meta **new, struct got_object_id *id,
80 const char *path, int obj_type, time_t mtime)
82 const struct got_error *err = NULL;
83 struct got_pack_meta *m;
87 m = calloc(1, sizeof(*m));
89 return got_error_from_errno("malloc");
91 memcpy(&m->id, id, sizeof(m->id));
93 m->path = strdup(path);
94 if (m->path == NULL) {
95 err = got_error_from_errno("strdup");
100 m->obj_type = obj_type;
107 clear_meta(struct got_pack_meta *meta)
118 free_nmeta(struct got_pack_meta **meta, int nmeta)
122 for (i = 0; i < nmeta; i++)
128 delta_order_cmp(const void *pa, const void *pb)
130 struct got_pack_meta *a, *b;
133 a = *(struct got_pack_meta **)pa;
134 b = *(struct got_pack_meta **)pb;
136 if (a->obj_type != b->obj_type)
137 return a->obj_type - b->obj_type;
138 cmp = strcmp(a->path, b->path);
141 if (a->mtime != b->mtime)
142 return a->mtime - b->mtime;
143 return got_object_id_cmp(&a->id, &b->id);
147 delta_size(struct got_delta_instruction *deltas, int ndeltas)
150 for (i = 0; i < ndeltas; i++) {
152 size += GOT_DELTA_SIZE_SHIFT;
154 size += deltas[i].len + 1;
160 static const struct got_error *
161 pick_deltas(struct got_pack_meta **meta, int nmeta, int nours,
162 struct got_repository *repo,
163 got_pack_progress_cb progress_cb, void *progress_arg,
164 got_cancel_cb cancel_cb, void *cancel_arg)
166 const struct got_error *err = NULL;
167 struct got_pack_meta *m = NULL, *base = NULL;
168 struct got_raw_object *raw = NULL, *base_raw = NULL;
169 struct got_delta_instruction *deltas;
170 int i, j, size, ndeltas, best;
171 const int max_base_candidates = 10;
173 qsort(meta, nmeta, sizeof(struct got_pack_meta *), delta_order_cmp);
174 for (i = 0; i < nmeta; i++) {
176 err = (*cancel_cb)(cancel_arg);
181 err = progress_cb(progress_arg, 0L, nours, nmeta, i, 0);
189 if (m->obj_type == GOT_OBJ_TYPE_COMMIT ||
190 m->obj_type == GOT_OBJ_TYPE_TAG)
193 err = got_object_raw_open(&raw, repo, &m->id, 8192);
197 err = got_deltify_init(&m->dtab, raw->f, raw->hdrlen,
198 raw->size + raw->hdrlen);
202 if (i > max_base_candidates) {
203 struct got_pack_meta *n = NULL;
204 n = meta[i - (max_base_candidates + 1)];
205 got_deltify_free(n->dtab);
210 for (j = MAX(0, i - max_base_candidates); j < i; j++) {
212 err = (*cancel_cb)(cancel_arg);
217 /* long chains make unpacking slow, avoid such bases */
218 if (base->nchain >= 128 ||
219 base->obj_type != m->obj_type)
222 err = got_object_raw_open(&base_raw, repo, &base->id,
226 err = got_deltify(&deltas, &ndeltas,
227 raw->f, raw->hdrlen, raw->size + raw->hdrlen,
228 base->dtab, base_raw->f, base_raw->hdrlen,
229 base_raw->size + base_raw->hdrlen);
230 got_object_raw_close(base_raw);
235 size = delta_size(deltas, ndeltas);
236 if (size + 32 < best){
238 * if we already picked a best delta,
244 m->ndeltas = ndeltas;
245 m->nchain = base->nchain + 1;
247 m->head = base->head;
257 got_object_raw_close(raw);
261 for (i = MAX(0, nmeta - max_base_candidates); i < nmeta; i++) {
262 got_deltify_free(meta[i]->dtab);
263 meta[i]->dtab = NULL;
266 got_object_raw_close(raw);
268 got_object_raw_close(base_raw);
272 static const struct got_error *
273 search_packidx(int *found, struct got_object_id *id,
274 struct got_repository *repo)
276 const struct got_error *err = NULL;
277 struct got_packidx *packidx = NULL;
282 err = got_repo_search_packidx(&packidx, &idx, repo, id);
284 *found = 1; /* object is already packed */
285 else if (err->code == GOT_ERR_NO_OBJ)
290 static const int obj_types[] = {
296 GOT_OBJ_TYPE_OFFSET_DELTA,
297 GOT_OBJ_TYPE_REF_DELTA
300 static const struct got_error *
301 add_meta(struct got_pack_metavec *v, struct got_object_idset *idset,
302 struct got_object_id *id, const char *path, int obj_type,
303 time_t mtime, int loose_obj_only, struct got_repository *repo)
305 const struct got_error *err;
306 struct got_pack_meta *m;
308 if (loose_obj_only) {
310 err = search_packidx(&is_packed, id, repo);
317 err = got_object_idset_add(idset, id, (void *)&obj_types[obj_type]);
324 err = alloc_meta(&m, id, path, obj_type, mtime);
328 if (v->nmeta == v->metasz){
329 size_t newsize = 2 * v->metasz;
330 struct got_pack_meta **new;
331 new = reallocarray(v->meta, newsize, sizeof(*new));
333 err = got_error_from_errno("reallocarray");
344 v->meta[v->nmeta++] = m;
349 static const struct got_error *
350 load_tree_entries(struct got_object_id_queue *ids, struct got_pack_metavec *v,
351 struct got_object_idset *idset, struct got_object_id *tree_id,
352 const char *dpath, time_t mtime, struct got_repository *repo,
353 int loose_obj_only, got_cancel_cb cancel_cb, void *cancel_arg)
355 const struct got_error *err;
356 struct got_tree_object *tree;
360 err = got_object_open_as_tree(&tree, repo, tree_id);
364 for (i = 0; i < got_object_tree_get_nentries(tree); i++) {
365 struct got_tree_entry *e = got_object_tree_get_entry(tree, i);
366 struct got_object_id *id = got_tree_entry_get_id(e);
367 mode_t mode = got_tree_entry_get_mode(e);
370 err = (*cancel_cb)(cancel_arg);
375 if (got_object_tree_entry_is_submodule(e) ||
376 got_object_idset_contains(idset, id))
379 if (asprintf(&p, "%s%s%s", dpath, dpath[0] != '\0' ? "/" : "",
380 got_tree_entry_get_name(e)) == -1) {
381 err = got_error_from_errno("asprintf");
386 struct got_object_qid *qid;
387 err = got_object_qid_alloc(&qid, id);
390 STAILQ_INSERT_TAIL(ids, qid, entry);
391 } else if (S_ISREG(mode) || S_ISLNK(mode)) {
392 err = add_meta(v, idset, id, p, GOT_OBJ_TYPE_BLOB,
393 mtime, loose_obj_only, repo);
401 got_object_tree_close(tree);
406 static const struct got_error *
407 load_tree(struct got_pack_metavec *v, struct got_object_idset *idset,
408 struct got_object_id *tree_id, const char *dpath, time_t mtime,
409 int loose_obj_only, struct got_repository *repo,
410 got_cancel_cb cancel_cb, void *cancel_arg)
412 const struct got_error *err = NULL;
413 struct got_object_id_queue tree_ids;
414 struct got_object_qid *qid;
416 if (got_object_idset_contains(idset, tree_id))
419 err = got_object_qid_alloc(&qid, tree_id);
423 STAILQ_INIT(&tree_ids);
424 STAILQ_INSERT_TAIL(&tree_ids, qid, entry);
426 while (!STAILQ_EMPTY(&tree_ids)) {
428 err = (*cancel_cb)(cancel_arg);
433 qid = STAILQ_FIRST(&tree_ids);
434 STAILQ_REMOVE_HEAD(&tree_ids, entry);
436 if (got_object_idset_contains(idset, qid->id)) {
437 got_object_qid_free(qid);
441 err = add_meta(v, idset, qid->id, dpath, GOT_OBJ_TYPE_TREE,
442 mtime, loose_obj_only, repo);
444 got_object_qid_free(qid);
448 err = load_tree_entries(&tree_ids, v, idset, qid->id, dpath,
449 mtime, repo, loose_obj_only, cancel_cb, cancel_arg);
450 got_object_qid_free(qid);
455 got_object_id_queue_free(&tree_ids);
459 static const struct got_error *
460 load_commit(struct got_pack_metavec *v, struct got_object_idset *idset,
461 struct got_object_id *id, struct got_repository *repo, int loose_obj_only,
462 got_cancel_cb cancel_cb, void *cancel_arg)
464 const struct got_error *err;
465 struct got_commit_object *commit;
467 if (got_object_idset_contains(idset, id))
470 if (loose_obj_only) {
472 err = search_packidx(&is_packed, id, repo);
479 err = got_object_open_as_commit(&commit, repo, id);
483 err = add_meta(v, idset, id, "", GOT_OBJ_TYPE_COMMIT,
484 got_object_commit_get_committer_time(commit),
485 loose_obj_only, repo);
489 err = load_tree(v, idset, got_object_commit_get_tree_id(commit),
490 "", got_object_commit_get_committer_time(commit),
491 loose_obj_only, repo, cancel_cb, cancel_arg);
493 got_object_commit_close(commit);
497 static const struct got_error *
498 load_tag(struct got_pack_metavec *v, struct got_object_idset *idset,
499 struct got_object_id *id, struct got_repository *repo, int loose_obj_only,
500 got_cancel_cb cancel_cb, void *cancel_arg)
502 const struct got_error *err;
503 struct got_tag_object *tag = NULL;
505 if (got_object_idset_contains(idset, id))
508 if (loose_obj_only) {
510 err = search_packidx(&is_packed, id, repo);
517 err = got_object_open_as_tag(&tag, repo, id);
521 err = add_meta(v, idset, id, "", GOT_OBJ_TYPE_TAG,
522 got_object_tag_get_tagger_time(tag),
523 loose_obj_only, repo);
527 switch (got_object_tag_get_object_type(tag)) {
528 case GOT_OBJ_TYPE_COMMIT:
529 err = load_commit(v, idset,
530 got_object_tag_get_object_id(tag), repo,
531 loose_obj_only, cancel_cb, cancel_arg);
533 case GOT_OBJ_TYPE_TREE:
534 err = load_tree(v, idset, got_object_tag_get_object_id(tag),
535 "", got_object_tag_get_tagger_time(tag),
536 loose_obj_only, repo, cancel_cb, cancel_arg);
543 got_object_tag_close(tag);
547 enum findtwixt_color {
552 static const int findtwixt_colors[] = {
558 static const struct got_error *
559 queue_commit_id(struct got_object_id_queue *ids, struct got_object_id *id,
560 int color, struct got_repository *repo)
562 const struct got_error *err;
563 struct got_object_qid *qid;
565 err = got_object_qid_alloc(&qid, id);
569 STAILQ_INSERT_TAIL(ids, qid, entry);
570 qid->data = (void *)&findtwixt_colors[color];
574 static const struct got_error *
575 drop_commit(struct got_object_idset *keep, struct got_object_idset *drop,
576 struct got_object_id *id, struct got_repository *repo,
577 got_cancel_cb cancel_cb, void *cancel_arg)
579 const struct got_error *err = NULL;
580 struct got_commit_object *commit;
581 const struct got_object_id_queue *parents;
582 struct got_object_id_queue ids;
583 struct got_object_qid *qid;
587 err = got_object_qid_alloc(&qid, id);
590 STAILQ_INSERT_HEAD(&ids, qid, entry);
592 while (!STAILQ_EMPTY(&ids)) {
594 err = (*cancel_cb)(cancel_arg);
599 qid = STAILQ_FIRST(&ids);
600 STAILQ_REMOVE_HEAD(&ids, entry);
602 if (got_object_idset_contains(drop, qid->id)) {
603 got_object_qid_free(qid);
607 err = got_object_idset_add(drop, qid->id,
608 (void *)&obj_types[GOT_OBJ_TYPE_COMMIT]);
610 got_object_qid_free(qid);
614 if (!got_object_idset_contains(keep, qid->id)) {
615 got_object_qid_free(qid);
619 err = got_object_open_as_commit(&commit, repo, qid->id);
620 got_object_qid_free(qid);
624 parents = got_object_commit_get_parent_ids(commit);
626 err = got_object_id_queue_copy(parents, &ids);
628 got_object_commit_close(commit);
632 got_object_commit_close(commit);
635 got_object_id_queue_free(&ids);
639 struct append_id_arg {
640 struct got_object_id **array;
644 static const struct got_error *
645 append_id(struct got_object_id *id, void *data, void *arg)
647 struct append_id_arg *a = arg;
649 a->array[a->idx] = got_object_id_dup(id);
650 if (a->array[a->idx] == NULL)
651 return got_error_from_errno("got_object_id_dup");
657 static const struct got_error *
658 findtwixt(struct got_object_id ***res, int *nres,
659 struct got_object_id **head, int nhead,
660 struct got_object_id **tail, int ntail,
661 struct got_repository *repo,
662 got_cancel_cb cancel_cb, void *cancel_arg)
664 const struct got_error *err = NULL;
665 struct got_object_id_queue ids;
666 struct got_object_idset *keep, *drop;
667 struct got_object_qid *qid;
668 int i, ncolor, nkeep, obj_type;
674 keep = got_object_idset_alloc();
676 return got_error_from_errno("got_object_idset_alloc");
678 drop = got_object_idset_alloc();
680 err = got_error_from_errno("got_object_idset_alloc");
684 for (i = 0; i < nhead; i++) {
685 struct got_object_id *id = head[i];
688 err = got_object_get_type(&obj_type, repo, id);
691 if (obj_type != GOT_OBJ_TYPE_COMMIT)
693 err = queue_commit_id(&ids, id, COLOR_KEEP, repo);
697 for (i = 0; i < ntail; i++) {
698 struct got_object_id *id = tail[i];
701 err = got_object_get_type(&obj_type, repo, id);
704 if (obj_type != GOT_OBJ_TYPE_COMMIT)
706 err = queue_commit_id(&ids, id, COLOR_DROP, repo);
711 while (!STAILQ_EMPTY(&ids)) {
713 qid = STAILQ_FIRST(&ids);
714 qcolor = *((int *)qid->data);
716 if (got_object_idset_contains(drop, qid->id))
718 else if (got_object_idset_contains(keep, qid->id))
721 ncolor = COLOR_BLANK;
723 if (ncolor == COLOR_DROP || (ncolor == COLOR_KEEP &&
724 qcolor == COLOR_KEEP)) {
725 STAILQ_REMOVE_HEAD(&ids, entry);
726 got_object_qid_free(qid);
730 if (ncolor == COLOR_KEEP && qcolor == COLOR_DROP) {
731 err = drop_commit(keep, drop, qid->id, repo,
732 cancel_cb, cancel_arg);
735 } else if (ncolor == COLOR_BLANK) {
736 struct got_commit_object *commit;
737 struct got_object_id *id;
738 const struct got_object_id_queue *parents;
739 struct got_object_qid *pid;
741 id = got_object_id_dup(qid->id);
743 err = got_error_from_errno("got_object_id_dup");
746 if (qcolor == COLOR_KEEP)
747 err = got_object_idset_add(keep, id,
748 (void *)&obj_types[GOT_OBJ_TYPE_COMMIT]);
750 err = got_object_idset_add(drop, id,
751 (void *)&obj_types[GOT_OBJ_TYPE_COMMIT]);
757 err = got_object_open_as_commit(&commit, repo, id);
762 parents = got_object_commit_get_parent_ids(commit);
764 STAILQ_FOREACH(pid, parents, entry) {
765 err = queue_commit_id(&ids, pid->id,
773 got_object_commit_close(commit);
776 /* should not happen */
777 err = got_error_fmt(GOT_ERR_NOT_IMPL,
778 "%s ncolor=%d qcolor=%d", __func__, ncolor, qcolor);
782 STAILQ_REMOVE_HEAD(&ids, entry);
783 got_object_qid_free(qid);
786 nkeep = got_object_idset_num_elements(keep);
788 struct append_id_arg arg;
789 arg.array = calloc(nkeep, sizeof(struct got_object_id *));
790 if (arg.array == NULL) {
791 err = got_error_from_errno("calloc");
795 err = got_object_idset_for_each(keep, append_id, &arg);
804 got_object_idset_free(keep);
805 got_object_idset_free(drop);
806 got_object_id_queue_free(&ids);
810 static const struct got_error *
811 read_meta(struct got_pack_meta ***meta, int *nmeta,
812 struct got_object_id **theirs, int ntheirs,
813 struct got_object_id **ours, int nours, struct got_repository *repo,
814 int loose_obj_only, got_pack_progress_cb progress_cb, void *progress_arg,
815 got_cancel_cb cancel_cb, void *cancel_arg)
817 const struct got_error *err = NULL;
818 struct got_object_id **ids = NULL;
819 struct got_object_idset *idset;
820 int i, nobj = 0, obj_type;
821 struct got_pack_metavec v;
826 idset = got_object_idset_alloc();
828 return got_error_from_errno("got_object_idset_alloc");
832 v.meta = calloc(v.metasz, sizeof(struct got_pack_meta *));
833 if (v.meta == NULL) {
834 err = got_error_from_errno("reallocarray");
838 err = findtwixt(&ids, &nobj, ours, nours, theirs, ntheirs, repo,
839 cancel_cb, cancel_arg);
840 if (err || nobj == 0)
843 for (i = 0; i < ntheirs; i++) {
844 struct got_object_id *id = theirs[i];
847 err = got_object_get_type(&obj_type, repo, id);
850 if (obj_type != GOT_OBJ_TYPE_COMMIT)
852 err = load_commit(NULL, idset, id, repo,
853 loose_obj_only, cancel_cb, cancel_arg);
857 err = progress_cb(progress_arg, 0L, nours,
864 for (i = 0; i < ntheirs; i++) {
865 struct got_object_id *id = theirs[i];
869 cached_type = got_object_idset_get(idset, id);
870 if (cached_type == NULL) {
871 err = got_object_get_type(&obj_type, repo, id);
875 obj_type = *cached_type;
876 if (obj_type != GOT_OBJ_TYPE_TAG)
878 err = load_tag(NULL, idset, id, repo,
879 loose_obj_only, cancel_cb, cancel_arg);
883 err = progress_cb(progress_arg, 0L, nours,
890 for (i = 0; i < nobj; i++) {
891 err = load_commit(&v, idset, ids[i], repo,
892 loose_obj_only, cancel_cb, cancel_arg);
896 err = progress_cb(progress_arg, 0L, nours,
903 for (i = 0; i < nours; i++) {
904 struct got_object_id *id = ours[i];
908 cached_type = got_object_idset_get(idset, id);
909 if (cached_type == NULL) {
910 err = got_object_get_type(&obj_type, repo, id);
914 obj_type = *cached_type;
915 if (obj_type != GOT_OBJ_TYPE_TAG)
917 err = load_tag(&v, idset, id, repo,
918 loose_obj_only, cancel_cb, cancel_arg);
922 err = progress_cb(progress_arg, 0L, nours,
930 for (i = 0; i < nobj; i++) {
934 got_object_idset_free(idset);
944 const struct got_error *
945 hwrite(FILE *f, void *buf, int len, SHA1_CTX *ctx)
949 SHA1Update(ctx, buf, len);
950 n = fwrite(buf, 1, len, f);
952 return got_ferror(f, GOT_ERR_IO);
957 putbe32(char *b, uint32_t n)
966 write_order_cmp(const void *pa, const void *pb)
968 struct got_pack_meta *a, *b, *ahd, *bhd;
970 a = *(struct got_pack_meta **)pa;
971 b = *(struct got_pack_meta **)pb;
972 ahd = (a->head == NULL) ? a : a->head;
973 bhd = (b->head == NULL) ? b : b->head;
974 if (ahd->mtime != bhd->mtime)
975 return bhd->mtime - ahd->mtime;
977 return (uintptr_t)bhd - (uintptr_t)ahd;
978 if (a->nchain != b->nchain)
979 return a->nchain - b->nchain;
980 return a->mtime - b->mtime;
983 static const struct got_error *
984 packhdr(int *hdrlen, char *hdr, size_t bufsize, int obj_type, size_t len)
990 hdr[0] = obj_type << 4;
993 for (i = 1; len != 0; i++){
995 return got_error(GOT_ERR_NO_SPACE);
996 hdr[i - 1] |= GOT_DELTA_SIZE_MORE;
997 hdr[i] = len & GOT_DELTA_SIZE_VAL_MASK;
998 len >>= GOT_DELTA_SIZE_SHIFT;
1005 static const struct got_error *
1006 append(char **p, int *len, int *sz, void *seg, int nseg)
1010 if (*len + nseg >= *sz) {
1011 while (*len + nseg >= *sz)
1013 n = realloc(*p, *sz);
1015 return got_error_from_errno("realloc");
1018 memcpy(*p + *len, seg, nseg);
1024 static const struct got_error *
1025 encodedelta(int *nd, struct got_pack_meta *m, struct got_raw_object *o,
1026 off_t base_size, char **pp)
1028 const struct got_error *err = NULL;
1030 unsigned char buf[16], *bp;
1033 struct got_delta_instruction *d;
1042 return got_error_from_errno("malloc");
1044 /* base object size */
1045 buf[0] = base_size & GOT_DELTA_SIZE_VAL_MASK;
1046 n = base_size >> GOT_DELTA_SIZE_SHIFT;
1047 for (i = 1; n > 0; i++) {
1048 buf[i - 1] |= GOT_DELTA_SIZE_MORE;
1049 buf[i] = n & GOT_DELTA_SIZE_VAL_MASK;
1050 n >>= GOT_DELTA_SIZE_SHIFT;
1052 err = append(&p, &len, &sz, buf, i);
1056 /* target object size */
1057 buf[0] = o->size & GOT_DELTA_SIZE_VAL_MASK;
1058 n = o->size >> GOT_DELTA_SIZE_SHIFT;
1059 for (i = 1; n > 0; i++) {
1060 buf[i - 1] |= GOT_DELTA_SIZE_MORE;
1061 buf[i] = n & GOT_DELTA_SIZE_VAL_MASK;
1062 n >>= GOT_DELTA_SIZE_SHIFT;
1064 err = append(&p, &len, &sz, buf, i);
1067 for (j = 0; j < m->ndeltas; j++) {
1072 buf[0] = GOT_DELTA_BASE_COPY;
1073 for (i = 0; i < 4; i++) {
1074 /* DELTA_COPY_OFF1 ... DELTA_COPY_OFF4 */
1083 if (n != GOT_DELTA_COPY_DEFAULT_LEN) {
1084 /* DELTA_COPY_LEN1 ... DELTA_COPY_LEN3 */
1085 for (i = 0; i < 3 && n > 0; i++) {
1086 buf[0] |= 1 << (i + 4);
1091 err = append(&p, &len, &sz, buf, bp - buf);
1097 if (fseeko(o->f, o->hdrlen + d->offset, SEEK_SET) == -1)
1098 return got_error_from_errno("fseeko");
1100 while (n != d->len) {
1101 buf[0] = (d->len - n < 127) ? d->len - n : 127;
1102 err = append(&p, &len, &sz, buf, 1);
1105 r = fread(content, 1, buf[0], o->f);
1107 return got_ferror(o->f, GOT_ERR_IO);
1108 err = append(&p, &len, &sz, content, buf[0]);
1121 packoff(char *hdr, off_t off)
1126 rbuf[0] = off & GOT_DELTA_SIZE_VAL_MASK;
1127 for (i = 1; (off >>= GOT_DELTA_SIZE_SHIFT) != 0; i++) {
1128 rbuf[i] = (--off & GOT_DELTA_SIZE_VAL_MASK) |
1129 GOT_DELTA_SIZE_MORE;
1134 hdr[j++] = rbuf[--i];
1138 static const struct got_error *
1139 genpack(uint8_t *pack_sha1, FILE *packfile,
1140 struct got_pack_meta **meta, int nmeta, int nours,
1141 int use_offset_deltas, struct got_repository *repo,
1142 got_pack_progress_cb progress_cb, void *progress_arg,
1143 got_cancel_cb cancel_cb, void *cancel_arg)
1145 const struct got_error *err = NULL;
1148 struct got_pack_meta *m;
1149 struct got_raw_object *raw;
1150 char *p = NULL, buf[32];
1152 struct got_deflate_checksum csum;
1153 off_t packfile_size = 0;
1156 csum.output_sha1 = &ctx;
1157 csum.output_crc = NULL;
1159 err = hwrite(packfile, "PACK", 4, &ctx);
1162 putbe32(buf, GOT_PACKFILE_VERSION);
1163 err = hwrite(packfile, buf, 4, &ctx);
1166 putbe32(buf, nmeta);
1167 err = hwrite(packfile, buf, 4, &ctx);
1170 qsort(meta, nmeta, sizeof(struct got_pack_meta *), write_order_cmp);
1171 for (i = 0; i < nmeta; i++) {
1173 err = progress_cb(progress_arg, packfile_size, nours,
1179 m->off = ftello(packfile);
1180 err = got_object_raw_open(&raw, repo, &m->id, 8192);
1183 if (m->deltas == NULL) {
1184 err = packhdr(&nh, buf, sizeof(buf),
1185 m->obj_type, raw->size);
1188 err = hwrite(packfile, buf, nh, &ctx);
1191 packfile_size += nh;
1192 if (fseeko(raw->f, raw->hdrlen, SEEK_SET) == -1) {
1193 err = got_error_from_errno("fseeko");
1196 err = got_deflate_to_file(&outlen, raw->f, packfile,
1200 packfile_size += outlen;
1203 struct got_raw_object *base_raw;
1204 err = got_object_raw_open(&base_raw, repo,
1205 &m->prev->id, 8192);
1208 err = encodedelta(&nd, m, raw, base_raw->size, &p);
1211 got_object_raw_close(base_raw);
1212 if (use_offset_deltas && m->prev->off != 0) {
1213 err = packhdr(&nh, buf, sizeof(buf),
1214 GOT_OBJ_TYPE_OFFSET_DELTA, nd);
1217 nh += packoff(buf + nh,
1218 m->off - m->prev->off);
1219 err = hwrite(packfile, buf, nh, &ctx);
1222 packfile_size += nh;
1224 err = packhdr(&nh, buf, sizeof(buf),
1225 GOT_OBJ_TYPE_REF_DELTA, nd);
1226 err = hwrite(packfile, buf, nh, &ctx);
1229 packfile_size += nh;
1230 err = hwrite(packfile, m->prev->id.sha1,
1231 sizeof(m->prev->id.sha1), &ctx);
1232 packfile_size += sizeof(m->prev->id.sha1);
1236 /* XXX need got_deflate_from_mem() */
1237 delta_file = fmemopen(p, nd, "r");
1238 if (delta_file == NULL) {
1239 err = got_error_from_errno("fmemopen");
1242 err = got_deflate_to_file(&outlen, delta_file,
1247 packfile_size += outlen;
1251 got_object_raw_close(raw);
1254 SHA1Final(pack_sha1, &ctx);
1255 n = fwrite(pack_sha1, 1, SHA1_DIGEST_LENGTH, packfile);
1256 if (n != SHA1_DIGEST_LENGTH)
1257 err = got_ferror(packfile, GOT_ERR_IO);
1258 packfile_size += SHA1_DIGEST_LENGTH;
1259 packfile_size += sizeof(struct got_packfile_hdr);
1260 err = progress_cb(progress_arg, packfile_size, nours,
1261 nmeta, nmeta, nmeta);
1269 const struct got_error *
1270 got_pack_create(uint8_t *packsha1, FILE *packfile,
1271 struct got_object_id **theirs, int ntheirs,
1272 struct got_object_id **ours, int nours,
1273 struct got_repository *repo, int loose_obj_only, int allow_empty,
1274 got_pack_progress_cb progress_cb, void *progress_arg,
1275 got_cancel_cb cancel_cb, void *cancel_arg)
1277 const struct got_error *err;
1278 struct got_pack_meta **meta;
1281 err = read_meta(&meta, &nmeta, theirs, ntheirs, ours, nours, repo,
1282 loose_obj_only, progress_cb, progress_arg, cancel_cb, cancel_arg);
1286 if (nmeta == 0 && !allow_empty) {
1287 err = got_error(GOT_ERR_CANNOT_PACK);
1291 err = pick_deltas(meta, nmeta, nours, repo,
1292 progress_cb, progress_arg, cancel_cb, cancel_arg);
1297 err = genpack(packsha1, packfile, meta, nmeta, nours, 1, repo,
1298 progress_cb, progress_arg, cancel_cb, cancel_arg);
1302 free_nmeta(meta, nmeta);