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![Junio C Hamano](/assets/img/avatar_default.png)
Packed delta files created by git-pack-objects seems to be the way to go, and existing "delta" object handling code has exposed the object representation details to too many places. Remove it while we refactor code to come up with a proper interface in sha1_file.c. Signed-off-by: Junio C Hamano <junkio@cox.net> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
153 lines
3.4 KiB
C
153 lines
3.4 KiB
C
#include "object.h"
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#include "blob.h"
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#include "tree.h"
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#include "commit.h"
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#include "cache.h"
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#include "tag.h"
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struct object **objs;
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int nr_objs;
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static int obj_allocs;
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static int find_object(const unsigned char *sha1)
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{
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int first = 0, last = nr_objs;
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while (first < last) {
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int next = (first + last) / 2;
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struct object *obj = objs[next];
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int cmp;
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cmp = memcmp(sha1, obj->sha1, 20);
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if (!cmp)
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return next;
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if (cmp < 0) {
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last = next;
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continue;
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}
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first = next+1;
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}
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return -first-1;
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}
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struct object *lookup_object(const unsigned char *sha1)
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{
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int pos = find_object(sha1);
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if (pos >= 0)
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return objs[pos];
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return NULL;
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}
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void created_object(const unsigned char *sha1, struct object *obj)
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{
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int pos = find_object(sha1);
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obj->parsed = 0;
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memcpy(obj->sha1, sha1, 20);
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obj->type = NULL;
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obj->refs = NULL;
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obj->used = 0;
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if (pos >= 0)
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die("Inserting %s twice\n", sha1_to_hex(sha1));
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pos = -pos-1;
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if (obj_allocs == nr_objs) {
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obj_allocs = alloc_nr(obj_allocs);
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objs = xrealloc(objs, obj_allocs * sizeof(struct object *));
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}
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/* Insert it into the right place */
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memmove(objs + pos + 1, objs + pos, (nr_objs - pos) *
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sizeof(struct object *));
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objs[pos] = obj;
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nr_objs++;
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}
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void add_ref(struct object *refer, struct object *target)
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{
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struct object_list **pp = &refer->refs;
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struct object_list *p;
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while ((p = *pp) != NULL) {
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if (p->item == target)
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return;
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pp = &p->next;
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}
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target->used = 1;
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p = xmalloc(sizeof(*p));
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p->item = target;
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p->next = NULL;
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*pp = p;
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}
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void mark_reachable(struct object *obj, unsigned int mask)
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{
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struct object_list *p = obj->refs;
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/* If we've been here already, don't bother */
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if (obj->flags & mask)
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return;
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obj->flags |= mask;
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while (p) {
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mark_reachable(p->item, mask);
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p = p->next;
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}
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}
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struct object *lookup_object_type(const unsigned char *sha1, const char *type)
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{
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if (!strcmp(type, blob_type)) {
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return &lookup_blob(sha1)->object;
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} else if (!strcmp(type, tree_type)) {
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return &lookup_tree(sha1)->object;
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} else if (!strcmp(type, commit_type)) {
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return &lookup_commit(sha1)->object;
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} else if (!strcmp(type, tag_type)) {
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return &lookup_tag(sha1)->object;
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} else {
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error("Unknown type %s", type);
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return NULL;
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}
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}
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struct object *parse_object(const unsigned char *sha1)
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{
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unsigned long size;
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char type[20];
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void *buffer = read_sha1_file(sha1, type, &size);
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if (buffer) {
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struct object *obj;
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if (check_sha1_signature(sha1, buffer, size, type) < 0)
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printf("sha1 mismatch %s\n", sha1_to_hex(sha1));
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if (!strcmp(type, "blob")) {
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struct blob *blob = lookup_blob(sha1);
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parse_blob_buffer(blob, buffer, size);
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obj = &blob->object;
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} else if (!strcmp(type, "tree")) {
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struct tree *tree = lookup_tree(sha1);
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parse_tree_buffer(tree, buffer, size);
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obj = &tree->object;
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} else if (!strcmp(type, "commit")) {
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struct commit *commit = lookup_commit(sha1);
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parse_commit_buffer(commit, buffer, size);
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if (!commit->buffer) {
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commit->buffer = buffer;
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buffer = NULL;
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}
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obj = &commit->object;
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} else if (!strcmp(type, "tag")) {
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struct tag *tag = lookup_tag(sha1);
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parse_tag_buffer(tag, buffer, size);
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obj = &tag->object;
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} else {
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obj = NULL;
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}
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free(buffer);
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return obj;
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}
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return NULL;
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}
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