1 files changed, 152 insertions, 0 deletions
diff --git a/object.c b/object.c
new file mode 100644
index 0000000..c410e97
--- /dev/null
+++ b/object.c
@@ -0,0 +1,152 @@
+#include "object.h"
+#include "blob.h"
+#include "tree.h"
+#include "commit.h"
+#include "cache.h"
+#include "tag.h"
+
+struct object **objs;
+int nr_objs;
+static int obj_allocs;
+
+static int find_object(const unsigned char *sha1)
+{
+	int first = 0, last = nr_objs;
+
+        while (first < last) {
+                int next = (first + last) / 2;
+                struct object *obj = objs[next];
+                int cmp;
+
+                cmp = memcmp(sha1, obj->sha1, 20);
+                if (!cmp)
+                        return next;
+                if (cmp < 0) {
+                        last = next;
+                        continue;
+                }
+                first = next+1;
+        }
+        return -first-1;
+}
+
+struct object *lookup_object(const unsigned char *sha1)
+{
+	int pos = find_object(sha1);
+	if (pos >= 0)
+		return objs[pos];
+	return NULL;
+}
+
+void created_object(const unsigned char *sha1, struct object *obj)
+{
+	int pos = find_object(sha1);
+
+	obj->parsed = 0;
+	memcpy(obj->sha1, sha1, 20);
+	obj->type = NULL;
+	obj->refs = NULL;
+	obj->used = 0;
+
+	if (pos >= 0)
+		die("Inserting %s twice\n", sha1_to_hex(sha1));
+	pos = -pos-1;
+
+	if (obj_allocs == nr_objs) {
+		obj_allocs = alloc_nr(obj_allocs);
+		objs = xrealloc(objs, obj_allocs * sizeof(struct object *));
+	}
+
+	/* Insert it into the right place */
+	memmove(objs + pos + 1, objs + pos, (nr_objs - pos) * 
+		sizeof(struct object *));
+
+	objs[pos] = obj;
+	nr_objs++;
+}
+
+void add_ref(struct object *refer, struct object *target)
+{
+	struct object_list **pp = &refer->refs;
+	struct object_list *p;
+	
+	while ((p = *pp) != NULL) {
+		if (p->item == target)
+			return;
+		pp = &p->next;
+	}
+
+	target->used = 1;
+	p = xmalloc(sizeof(*p));
+	p->item = target;
+	p->next = NULL;
+	*pp = p;
+}
+
+void mark_reachable(struct object *obj, unsigned int mask)
+{
+	struct object_list *p = obj->refs;
+
+	/* If we've been here already, don't bother */
+	if (obj->flags & mask)
+		return;
+	obj->flags |= mask;
+	while (p) {
+		mark_reachable(p->item, mask);
+		p = p->next;
+	}
+}
+
+struct object *lookup_object_type(const unsigned char *sha1, const char *type)
+{
+	if (!strcmp(type, blob_type)) {
+		return &lookup_blob(sha1)->object;
+	} else if (!strcmp(type, tree_type)) {
+		return &lookup_tree(sha1)->object;
+	} else if (!strcmp(type, commit_type)) {
+		return &lookup_commit(sha1)->object;
+	} else if (!strcmp(type, tag_type)) {
+		return &lookup_tag(sha1)->object;
+	} else {
+		error("Unknown type %s", type);
+		return NULL;
+	}
+}
+
+struct object *parse_object(const unsigned char *sha1)
+{
+	unsigned long size;
+	char type[20];
+	void *buffer = read_sha1_file(sha1, type, &size);
+	if (buffer) {
+		struct object *obj;
+		if (check_sha1_signature(sha1, buffer, size, type) < 0)
+			printf("sha1 mismatch %s\n", sha1_to_hex(sha1));
+		if (!strcmp(type, "blob")) {
+			struct blob *blob = lookup_blob(sha1);
+			parse_blob_buffer(blob, buffer, size);
+			obj = &blob->object;
+		} else if (!strcmp(type, "tree")) {
+			struct tree *tree = lookup_tree(sha1);
+			parse_tree_buffer(tree, buffer, size);
+			obj = &tree->object;
+		} else if (!strcmp(type, "commit")) {
+			struct commit *commit = lookup_commit(sha1);
+			parse_commit_buffer(commit, buffer, size);
+			if (!commit->buffer) {
+				commit->buffer = buffer;
+				buffer = NULL;
+			}
+			obj = &commit->object;
+		} else if (!strcmp(type, "tag")) {
+			struct tag *tag = lookup_tag(sha1);
+			parse_tag_buffer(tag, buffer, size);
+			obj = &tag->object;
+		} else {
+			obj = NULL;
+		}
+		free(buffer);
+		return obj;
+	}
+	return NULL;
+}