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_symlink(e) ||
376 got_object_tree_entry_is_submodule(e) ||
377 got_object_idset_contains(idset, id))
380 if (asprintf(&p, "%s%s%s", dpath, dpath[0] != '\0' ? "/" : "",
381 got_tree_entry_get_name(e)) == -1) {
382 err = got_error_from_errno("asprintf");
387 struct got_object_qid *qid;
388 err = got_object_qid_alloc(&qid, id);
391 STAILQ_INSERT_TAIL(ids, qid, entry);
392 } else if (S_ISREG(mode)) {
393 err = add_meta(v, idset, id, p, GOT_OBJ_TYPE_BLOB,
394 mtime, loose_obj_only, repo);
402 got_object_tree_close(tree);
407 static const struct got_error *
408 load_tree(struct got_pack_metavec *v, struct got_object_idset *idset,
409 struct got_object_id *tree_id, const char *dpath, time_t mtime,
410 int loose_obj_only, struct got_repository *repo,
411 got_cancel_cb cancel_cb, void *cancel_arg)
413 const struct got_error *err = NULL;
414 struct got_object_id_queue tree_ids;
415 struct got_object_qid *qid;
417 if (got_object_idset_contains(idset, tree_id))
420 err = got_object_qid_alloc(&qid, tree_id);
424 STAILQ_INIT(&tree_ids);
425 STAILQ_INSERT_TAIL(&tree_ids, qid, entry);
427 while (!STAILQ_EMPTY(&tree_ids)) {
429 err = (*cancel_cb)(cancel_arg);
434 qid = STAILQ_FIRST(&tree_ids);
435 STAILQ_REMOVE_HEAD(&tree_ids, entry);
437 if (got_object_idset_contains(idset, qid->id)) {
438 got_object_qid_free(qid);
442 err = add_meta(v, idset, qid->id, dpath, GOT_OBJ_TYPE_TREE,
443 mtime, loose_obj_only, repo);
445 got_object_qid_free(qid);
449 err = load_tree_entries(&tree_ids, v, idset, qid->id, dpath,
450 mtime, repo, loose_obj_only, cancel_cb, cancel_arg);
451 got_object_qid_free(qid);
456 got_object_id_queue_free(&tree_ids);
460 static const struct got_error *
461 load_commit(struct got_pack_metavec *v, struct got_object_idset *idset,
462 struct got_object_id *id, struct got_repository *repo, int loose_obj_only,
463 got_cancel_cb cancel_cb, void *cancel_arg)
465 const struct got_error *err;
466 struct got_commit_object *commit;
468 if (got_object_idset_contains(idset, id))
471 if (loose_obj_only) {
473 err = search_packidx(&is_packed, id, repo);
480 err = got_object_open_as_commit(&commit, repo, id);
484 err = add_meta(v, idset, id, "", GOT_OBJ_TYPE_COMMIT,
485 got_object_commit_get_committer_time(commit),
486 loose_obj_only, repo);
490 err = load_tree(v, idset, got_object_commit_get_tree_id(commit),
491 "", got_object_commit_get_committer_time(commit),
492 loose_obj_only, repo, cancel_cb, cancel_arg);
494 got_object_commit_close(commit);
498 static const struct got_error *
499 load_tag(struct got_pack_metavec *v, struct got_object_idset *idset,
500 struct got_object_id *id, struct got_repository *repo, int loose_obj_only,
501 got_cancel_cb cancel_cb, void *cancel_arg)
503 const struct got_error *err;
504 struct got_tag_object *tag = NULL;
506 if (got_object_idset_contains(idset, id))
509 if (loose_obj_only) {
511 err = search_packidx(&is_packed, id, repo);
518 err = got_object_open_as_tag(&tag, repo, id);
522 err = add_meta(v, idset, id, "", GOT_OBJ_TYPE_TAG,
523 got_object_tag_get_tagger_time(tag),
524 loose_obj_only, repo);
528 switch (got_object_tag_get_object_type(tag)) {
529 case GOT_OBJ_TYPE_COMMIT:
530 err = load_commit(NULL, idset,
531 got_object_tag_get_object_id(tag), repo,
532 loose_obj_only, cancel_cb, cancel_arg);
534 case GOT_OBJ_TYPE_TREE:
535 err = load_tree(v, idset, got_object_tag_get_object_id(tag),
536 "", got_object_tag_get_tagger_time(tag),
537 loose_obj_only, repo, cancel_cb, cancel_arg);
544 got_object_tag_close(tag);
548 enum findtwixt_color {
553 static const int findtwixt_colors[] = {
559 static const struct got_error *
560 queue_commit_id(struct got_object_id_queue *ids, struct got_object_id *id,
561 int color, struct got_repository *repo)
563 const struct got_error *err;
564 struct got_object_qid *qid;
566 err = got_object_qid_alloc(&qid, id);
570 STAILQ_INSERT_TAIL(ids, qid, entry);
571 qid->data = (void *)&findtwixt_colors[color];
575 static const struct got_error *
576 drop_commit(struct got_object_idset *keep, struct got_object_idset *drop,
577 struct got_object_id *id, struct got_repository *repo,
578 got_cancel_cb cancel_cb, void *cancel_arg)
580 const struct got_error *err = NULL;
581 struct got_commit_object *commit;
582 const struct got_object_id_queue *parents;
583 struct got_object_id_queue ids;
584 struct got_object_qid *qid;
588 err = got_object_qid_alloc(&qid, id);
591 STAILQ_INSERT_HEAD(&ids, qid, entry);
593 while (!STAILQ_EMPTY(&ids)) {
595 err = (*cancel_cb)(cancel_arg);
600 qid = STAILQ_FIRST(&ids);
601 STAILQ_REMOVE_HEAD(&ids, entry);
603 if (got_object_idset_contains(drop, qid->id)) {
604 got_object_qid_free(qid);
608 err = got_object_idset_add(drop, qid->id,
609 (void *)&obj_types[GOT_OBJ_TYPE_COMMIT]);
611 got_object_qid_free(qid);
615 if (!got_object_idset_contains(keep, qid->id)) {
616 got_object_qid_free(qid);
620 err = got_object_open_as_commit(&commit, repo, qid->id);
621 got_object_qid_free(qid);
625 parents = got_object_commit_get_parent_ids(commit);
627 err = got_object_id_queue_copy(parents, &ids);
629 got_object_commit_close(commit);
633 got_object_commit_close(commit);
636 got_object_id_queue_free(&ids);
640 struct append_id_arg {
641 struct got_object_id **array;
645 static const struct got_error *
646 append_id(struct got_object_id *id, void *data, void *arg)
648 struct append_id_arg *a = arg;
650 a->array[a->idx] = got_object_id_dup(id);
651 if (a->array[a->idx] == NULL)
652 return got_error_from_errno("got_object_id_dup");
658 static const struct got_error *
659 findtwixt(struct got_object_id ***res, int *nres,
660 struct got_object_id **head, int nhead,
661 struct got_object_id **tail, int ntail,
662 struct got_repository *repo,
663 got_cancel_cb cancel_cb, void *cancel_arg)
665 const struct got_error *err = NULL;
666 struct got_object_id_queue ids;
667 struct got_object_idset *keep, *drop;
668 struct got_object_qid *qid;
669 int i, ncolor, nkeep, obj_type;
675 keep = got_object_idset_alloc();
677 return got_error_from_errno("got_object_idset_alloc");
679 drop = got_object_idset_alloc();
681 err = got_error_from_errno("got_object_idset_alloc");
685 for (i = 0; i < nhead; i++) {
686 struct got_object_id *id = head[i];
689 err = got_object_get_type(&obj_type, repo, id);
692 if (obj_type != GOT_OBJ_TYPE_COMMIT)
694 err = queue_commit_id(&ids, id, COLOR_KEEP, repo);
698 for (i = 0; i < ntail; i++) {
699 struct got_object_id *id = tail[i];
702 err = got_object_get_type(&obj_type, repo, id);
705 if (obj_type != GOT_OBJ_TYPE_COMMIT)
707 err = queue_commit_id(&ids, id, COLOR_DROP, repo);
712 while (!STAILQ_EMPTY(&ids)) {
714 qid = STAILQ_FIRST(&ids);
715 qcolor = *((int *)qid->data);
717 if (got_object_idset_contains(drop, qid->id))
719 else if (got_object_idset_contains(keep, qid->id))
722 ncolor = COLOR_BLANK;
724 if (ncolor == COLOR_DROP || (ncolor == COLOR_KEEP &&
725 qcolor == COLOR_KEEP)) {
726 STAILQ_REMOVE_HEAD(&ids, entry);
727 got_object_qid_free(qid);
731 if (ncolor == COLOR_KEEP && qcolor == COLOR_DROP) {
732 err = drop_commit(keep, drop, qid->id, repo,
733 cancel_cb, cancel_arg);
736 } else if (ncolor == COLOR_BLANK) {
737 struct got_commit_object *commit;
738 struct got_object_id *id;
739 const struct got_object_id_queue *parents;
740 struct got_object_qid *pid;
742 id = got_object_id_dup(qid->id);
744 err = got_error_from_errno("got_object_id_dup");
747 if (qcolor == COLOR_KEEP)
748 err = got_object_idset_add(keep, id,
749 (void *)&obj_types[GOT_OBJ_TYPE_COMMIT]);
751 err = got_object_idset_add(drop, id,
752 (void *)&obj_types[GOT_OBJ_TYPE_COMMIT]);
758 err = got_object_open_as_commit(&commit, repo, id);
763 parents = got_object_commit_get_parent_ids(commit);
765 STAILQ_FOREACH(pid, parents, entry) {
766 err = queue_commit_id(&ids, pid->id,
774 got_object_commit_close(commit);
777 /* should not happen */
778 err = got_error_fmt(GOT_ERR_NOT_IMPL,
779 "%s ncolor=%d qcolor=%d", __func__, ncolor, qcolor);
783 STAILQ_REMOVE_HEAD(&ids, entry);
784 got_object_qid_free(qid);
787 nkeep = got_object_idset_num_elements(keep);
789 struct append_id_arg arg;
790 arg.array = calloc(nkeep, sizeof(struct got_object_id *));
791 if (arg.array == NULL) {
792 err = got_error_from_errno("calloc");
796 err = got_object_idset_for_each(keep, append_id, &arg);
805 got_object_idset_free(keep);
806 got_object_idset_free(drop);
807 got_object_id_queue_free(&ids);
811 static const struct got_error *
812 read_meta(struct got_pack_meta ***meta, int *nmeta,
813 struct got_object_id **theirs, int ntheirs,
814 struct got_object_id **ours, int nours, struct got_repository *repo,
815 int loose_obj_only, got_pack_progress_cb progress_cb, void *progress_arg,
816 got_cancel_cb cancel_cb, void *cancel_arg)
818 const struct got_error *err = NULL;
819 struct got_object_id **ids = NULL;
820 struct got_object_idset *idset;
821 int i, nobj = 0, obj_type;
822 struct got_pack_metavec v;
827 idset = got_object_idset_alloc();
829 return got_error_from_errno("got_object_idset_alloc");
833 v.meta = calloc(v.metasz, sizeof(struct got_pack_meta *));
834 if (v.meta == NULL) {
835 err = got_error_from_errno("reallocarray");
839 err = findtwixt(&ids, &nobj, ours, nours, theirs, ntheirs, repo,
840 cancel_cb, cancel_arg);
841 if (err || nobj == 0)
844 for (i = 0; i < ntheirs; i++) {
845 struct got_object_id *id = theirs[i];
848 err = got_object_get_type(&obj_type, repo, id);
851 if (obj_type != GOT_OBJ_TYPE_COMMIT)
853 err = load_commit(NULL, idset, id, repo,
854 loose_obj_only, cancel_cb, cancel_arg);
858 err = progress_cb(progress_arg, 0L, nours,
865 for (i = 0; i < ntheirs; i++) {
866 struct got_object_id *id = theirs[i];
870 cached_type = got_object_idset_get(idset, id);
871 if (cached_type == NULL) {
872 err = got_object_get_type(&obj_type, repo, id);
876 obj_type = *cached_type;
877 if (obj_type != GOT_OBJ_TYPE_TAG)
879 err = load_tag(NULL, idset, id, repo,
880 loose_obj_only, cancel_cb, cancel_arg);
884 err = progress_cb(progress_arg, 0L, nours,
891 for (i = 0; i < nobj; i++) {
892 err = load_commit(&v, idset, ids[i], repo,
893 loose_obj_only, cancel_cb, cancel_arg);
897 err = progress_cb(progress_arg, 0L, nours,
904 for (i = 0; i < nours; i++) {
905 struct got_object_id *id = ours[i];
909 cached_type = got_object_idset_get(idset, id);
910 if (cached_type == NULL) {
911 err = got_object_get_type(&obj_type, repo, id);
915 obj_type = *cached_type;
916 if (obj_type != GOT_OBJ_TYPE_TAG)
918 err = load_tag(&v, idset, id, repo,
919 loose_obj_only, cancel_cb, cancel_arg);
923 err = progress_cb(progress_arg, 0L, nours,
931 for (i = 0; i < nobj; i++) {
935 got_object_idset_free(idset);
945 const struct got_error *
946 hwrite(FILE *f, void *buf, int len, SHA1_CTX *ctx)
950 SHA1Update(ctx, buf, len);
951 n = fwrite(buf, 1, len, f);
953 return got_ferror(f, GOT_ERR_IO);
958 putbe32(char *b, uint32_t n)
967 write_order_cmp(const void *pa, const void *pb)
969 struct got_pack_meta *a, *b, *ahd, *bhd;
971 a = *(struct got_pack_meta **)pa;
972 b = *(struct got_pack_meta **)pb;
973 ahd = (a->head == NULL) ? a : a->head;
974 bhd = (b->head == NULL) ? b : b->head;
975 if (ahd->mtime != bhd->mtime)
976 return bhd->mtime - ahd->mtime;
978 return (uintptr_t)bhd - (uintptr_t)ahd;
979 if (a->nchain != b->nchain)
980 return a->nchain - b->nchain;
981 return a->mtime - b->mtime;
984 static const struct got_error *
985 packhdr(int *hdrlen, char *hdr, size_t bufsize, int obj_type, size_t len)
991 hdr[0] = obj_type << 4;
994 for (i = 1; len != 0; i++){
996 return got_error(GOT_ERR_NO_SPACE);
997 hdr[i - 1] |= GOT_DELTA_SIZE_MORE;
998 hdr[i] = len & GOT_DELTA_SIZE_VAL_MASK;
999 len >>= GOT_DELTA_SIZE_SHIFT;
1006 static const struct got_error *
1007 append(char **p, int *len, int *sz, void *seg, int nseg)
1011 if (*len + nseg >= *sz) {
1012 while (*len + nseg >= *sz)
1014 n = realloc(*p, *sz);
1016 return got_error_from_errno("realloc");
1019 memcpy(*p + *len, seg, nseg);
1025 static const struct got_error *
1026 encodedelta(int *nd, struct got_pack_meta *m, struct got_raw_object *o,
1027 off_t base_size, char **pp)
1029 const struct got_error *err = NULL;
1031 unsigned char buf[16], *bp;
1034 struct got_delta_instruction *d;
1043 return got_error_from_errno("malloc");
1045 /* base object size */
1046 buf[0] = base_size & GOT_DELTA_SIZE_VAL_MASK;
1047 n = base_size >> GOT_DELTA_SIZE_SHIFT;
1048 for (i = 1; n > 0; i++) {
1049 buf[i - 1] |= GOT_DELTA_SIZE_MORE;
1050 buf[i] = n & GOT_DELTA_SIZE_VAL_MASK;
1051 n >>= GOT_DELTA_SIZE_SHIFT;
1053 err = append(&p, &len, &sz, buf, i);
1057 /* target object size */
1058 buf[0] = o->size & GOT_DELTA_SIZE_VAL_MASK;
1059 n = o->size >> GOT_DELTA_SIZE_SHIFT;
1060 for (i = 1; n > 0; i++) {
1061 buf[i - 1] |= GOT_DELTA_SIZE_MORE;
1062 buf[i] = n & GOT_DELTA_SIZE_VAL_MASK;
1063 n >>= GOT_DELTA_SIZE_SHIFT;
1065 err = append(&p, &len, &sz, buf, i);
1068 for (j = 0; j < m->ndeltas; j++) {
1073 buf[0] = GOT_DELTA_BASE_COPY;
1074 for (i = 0; i < 4; i++) {
1075 /* DELTA_COPY_OFF1 ... DELTA_COPY_OFF4 */
1084 if (n != GOT_DELTA_COPY_DEFAULT_LEN) {
1085 /* DELTA_COPY_LEN1 ... DELTA_COPY_LEN3 */
1086 for (i = 0; i < 3 && n > 0; i++) {
1087 buf[0] |= 1 << (i + 4);
1092 err = append(&p, &len, &sz, buf, bp - buf);
1098 if (fseeko(o->f, o->hdrlen + d->offset, SEEK_SET) == -1)
1099 return got_error_from_errno("fseeko");
1101 while (n != d->len) {
1102 buf[0] = (d->len - n < 127) ? d->len - n : 127;
1103 err = append(&p, &len, &sz, buf, 1);
1106 r = fread(content, 1, buf[0], o->f);
1108 return got_ferror(o->f, GOT_ERR_IO);
1109 err = append(&p, &len, &sz, content, buf[0]);
1122 packoff(char *hdr, off_t off)
1127 rbuf[0] = off & GOT_DELTA_SIZE_VAL_MASK;
1128 for (i = 1; (off >>= GOT_DELTA_SIZE_SHIFT) != 0; i++) {
1129 rbuf[i] = (--off & GOT_DELTA_SIZE_VAL_MASK) |
1130 GOT_DELTA_SIZE_MORE;
1135 hdr[j++] = rbuf[--i];
1139 static const struct got_error *
1140 genpack(uint8_t *pack_sha1, FILE *packfile,
1141 struct got_pack_meta **meta, int nmeta, int nours,
1142 int use_offset_deltas, struct got_repository *repo,
1143 got_pack_progress_cb progress_cb, void *progress_arg,
1144 got_cancel_cb cancel_cb, void *cancel_arg)
1146 const struct got_error *err = NULL;
1149 struct got_pack_meta *m;
1150 struct got_raw_object *raw;
1151 char *p = NULL, buf[32];
1153 struct got_deflate_checksum csum;
1154 off_t packfile_size = 0;
1157 csum.output_sha1 = &ctx;
1158 csum.output_crc = NULL;
1160 err = hwrite(packfile, "PACK", 4, &ctx);
1163 putbe32(buf, GOT_PACKFILE_VERSION);
1164 err = hwrite(packfile, buf, 4, &ctx);
1167 putbe32(buf, nmeta);
1168 err = hwrite(packfile, buf, 4, &ctx);
1171 qsort(meta, nmeta, sizeof(struct got_pack_meta *), write_order_cmp);
1172 for (i = 0; i < nmeta; i++) {
1174 err = progress_cb(progress_arg, packfile_size, nours,
1180 m->off = ftello(packfile);
1181 err = got_object_raw_open(&raw, repo, &m->id, 8192);
1184 if (m->deltas == NULL) {
1185 err = packhdr(&nh, buf, sizeof(buf),
1186 m->obj_type, raw->size);
1189 err = hwrite(packfile, buf, nh, &ctx);
1192 packfile_size += nh;
1193 if (fseeko(raw->f, raw->hdrlen, SEEK_SET) == -1) {
1194 err = got_error_from_errno("fseeko");
1197 err = got_deflate_to_file(&outlen, raw->f, packfile,
1201 packfile_size += outlen;
1204 struct got_raw_object *base_raw;
1205 err = got_object_raw_open(&base_raw, repo,
1206 &m->prev->id, 8192);
1209 err = encodedelta(&nd, m, raw, base_raw->size, &p);
1212 got_object_raw_close(base_raw);
1213 if (use_offset_deltas && m->prev->off != 0) {
1214 err = packhdr(&nh, buf, sizeof(buf),
1215 GOT_OBJ_TYPE_OFFSET_DELTA, nd);
1218 nh += packoff(buf + nh,
1219 m->off - m->prev->off);
1220 err = hwrite(packfile, buf, nh, &ctx);
1223 packfile_size += nh;
1225 err = packhdr(&nh, buf, sizeof(buf),
1226 GOT_OBJ_TYPE_REF_DELTA, nd);
1227 err = hwrite(packfile, buf, nh, &ctx);
1230 packfile_size += nh;
1231 err = hwrite(packfile, m->prev->id.sha1,
1232 sizeof(m->prev->id.sha1), &ctx);
1233 packfile_size += sizeof(m->prev->id.sha1);
1237 /* XXX need got_deflate_from_mem() */
1238 delta_file = fmemopen(p, nd, "r");
1239 if (delta_file == NULL) {
1240 err = got_error_from_errno("fmemopen");
1243 err = got_deflate_to_file(&outlen, delta_file,
1248 packfile_size += outlen;
1252 got_object_raw_close(raw);
1255 SHA1Final(pack_sha1, &ctx);
1256 n = fwrite(pack_sha1, 1, SHA1_DIGEST_LENGTH, packfile);
1257 if (n != SHA1_DIGEST_LENGTH)
1258 err = got_ferror(packfile, GOT_ERR_IO);
1259 packfile_size += SHA1_DIGEST_LENGTH;
1260 packfile_size += sizeof(struct got_packfile_hdr);
1261 err = progress_cb(progress_arg, packfile_size, nours,
1262 nmeta, nmeta, nmeta);
1270 const struct got_error *
1271 got_pack_create(uint8_t *packsha1, FILE *packfile,
1272 struct got_object_id **theirs, int ntheirs,
1273 struct got_object_id **ours, int nours,
1274 struct got_repository *repo, int loose_obj_only, int allow_empty,
1275 got_pack_progress_cb progress_cb, void *progress_arg,
1276 got_cancel_cb cancel_cb, void *cancel_arg)
1278 const struct got_error *err;
1279 struct got_pack_meta **meta;
1282 err = read_meta(&meta, &nmeta, theirs, ntheirs, ours, nours, repo,
1283 loose_obj_only, progress_cb, progress_arg, cancel_cb, cancel_arg);
1287 if (nmeta == 0 && !allow_empty) {
1288 err = got_error(GOT_ERR_CANNOT_PACK);
1292 err = pick_deltas(meta, nmeta, nours, repo,
1293 progress_cb, progress_arg, cancel_cb, cancel_arg);
1298 err = genpack(packsha1, packfile, meta, nmeta, nours, 1, repo,
1299 progress_cb, progress_arg, cancel_cb, cancel_arg);
1303 free_nmeta(meta, nmeta);