1 files changed, 257 insertions, 0 deletions
diff --git a/object.c b/object.c
new file mode 100644
index 0000000..16793d9
--- /dev/null
+++ b/object.c
@@ -0,0 +1,257 @@
+#include "cache.h"
+#include "object.h"
+#include "blob.h"
+#include "tree.h"
+#include "commit.h"
+#include "tag.h"
+
+static struct object **obj_hash;
+static int nr_objs, obj_hash_size;
+
+unsigned int get_max_object_index(void)
+{
+	return obj_hash_size;
+}
+
+struct object *get_indexed_object(unsigned int idx)
+{
+	return obj_hash[idx];
+}
+
+static const char *object_type_strings[] = {
+	NULL,		/* OBJ_NONE = 0 */
+	"commit",	/* OBJ_COMMIT = 1 */
+	"tree",		/* OBJ_TREE = 2 */
+	"blob",		/* OBJ_BLOB = 3 */
+	"tag",		/* OBJ_TAG = 4 */
+};
+
+const char *typename(unsigned int type)
+{
+	if (type >= ARRAY_SIZE(object_type_strings))
+		return NULL;
+	return object_type_strings[type];
+}
+
+int type_from_string(const char *str)
+{
+	int i;
+
+	for (i = 1; i < ARRAY_SIZE(object_type_strings); i++)
+		if (!strcmp(str, object_type_strings[i]))
+			return i;
+	die("invalid object type \"%s\"", str);
+}
+
+static unsigned int hash_obj(struct object *obj, unsigned int n)
+{
+	unsigned int hash = *(unsigned int *)obj->sha1;
+	return hash % n;
+}
+
+static void insert_obj_hash(struct object *obj, struct object **hash, unsigned int size)
+{
+	int j = hash_obj(obj, size);
+
+	while (hash[j]) {
+		j++;
+		if (j >= size)
+			j = 0;
+	}
+	hash[j] = obj;
+}
+
+static int hashtable_index(const unsigned char *sha1)
+{
+	unsigned int i;
+	memcpy(&i, sha1, sizeof(unsigned int));
+	return (int)(i % obj_hash_size);
+}
+
+struct object *lookup_object(const unsigned char *sha1)
+{
+	int i;
+	struct object *obj;
+
+	if (!obj_hash)
+		return NULL;
+
+	i = hashtable_index(sha1);
+	while ((obj = obj_hash[i]) != NULL) {
+		if (!hashcmp(sha1, obj->sha1))
+			break;
+		i++;
+		if (i == obj_hash_size)
+			i = 0;
+	}
+	return obj;
+}
+
+static void grow_object_hash(void)
+{
+	int i;
+	int new_hash_size = obj_hash_size < 32 ? 32 : 2 * obj_hash_size;
+	struct object **new_hash;
+
+	new_hash = xcalloc(new_hash_size, sizeof(struct object *));
+	for (i = 0; i < obj_hash_size; i++) {
+		struct object *obj = obj_hash[i];
+		if (!obj)
+			continue;
+		insert_obj_hash(obj, new_hash, new_hash_size);
+	}
+	free(obj_hash);
+	obj_hash = new_hash;
+	obj_hash_size = new_hash_size;
+}
+
+void *create_object(const unsigned char *sha1, int type, void *o)
+{
+	struct object *obj = o;
+
+	obj->parsed = 0;
+	obj->used = 0;
+	obj->type = type;
+	obj->flags = 0;
+	hashcpy(obj->sha1, sha1);
+
+	if (obj_hash_size - 1 <= nr_objs * 2)
+		grow_object_hash();
+
+	insert_obj_hash(obj, obj_hash, obj_hash_size);
+	nr_objs++;
+	return obj;
+}
+
+struct object *lookup_unknown_object(const unsigned char *sha1)
+{
+	struct object *obj = lookup_object(sha1);
+	if (!obj)
+		obj = create_object(sha1, OBJ_NONE, alloc_object_node());
+	return obj;
+}
+
+struct object *parse_object_buffer(const unsigned char *sha1, enum object_type type, unsigned long size, void *buffer, int *eaten_p)
+{
+	struct object *obj;
+	int eaten = 0;
+
+	if (type == OBJ_BLOB) {
+		struct blob *blob = lookup_blob(sha1);
+		parse_blob_buffer(blob, buffer, size);
+		obj = &blob->object;
+	} else if (type == OBJ_TREE) {
+		struct tree *tree = lookup_tree(sha1);
+		obj = &tree->object;
+		if (!tree->object.parsed) {
+			parse_tree_buffer(tree, buffer, size);
+			eaten = 1;
+		}
+	} else if (type == OBJ_COMMIT) {
+		struct commit *commit = lookup_commit(sha1);
+		parse_commit_buffer(commit, buffer, size);
+		if (!commit->buffer) {
+			commit->buffer = buffer;
+			eaten = 1;
+		}
+		obj = &commit->object;
+	} else if (type == OBJ_TAG) {
+		struct tag *tag = lookup_tag(sha1);
+		parse_tag_buffer(tag, buffer, size);
+		obj = &tag->object;
+	} else {
+		warning("object %s has unknown type id %d\n", sha1_to_hex(sha1), type);
+		obj = NULL;
+	}
+	if (obj && obj->type == OBJ_NONE)
+		obj->type = type;
+	*eaten_p = eaten;
+	return obj;
+}
+
+struct object *parse_object(const unsigned char *sha1)
+{
+	unsigned long size;
+	enum object_type type;
+	int eaten;
+	void *buffer = read_sha1_file(sha1, &type, &size);
+
+	if (buffer) {
+		struct object *obj;
+		if (check_sha1_signature(sha1, buffer, size, typename(type)) < 0) {
+			free(buffer);
+			error("sha1 mismatch %s\n", sha1_to_hex(sha1));
+			return NULL;
+		}
+
+		obj = parse_object_buffer(sha1, type, size, buffer, &eaten);
+		if (!eaten)
+			free(buffer);
+		return obj;
+	}
+	return NULL;
+}
+
+struct object_list *object_list_insert(struct object *item,
+				       struct object_list **list_p)
+{
+	struct object_list *new_list = xmalloc(sizeof(struct object_list));
+        new_list->item = item;
+        new_list->next = *list_p;
+        *list_p = new_list;
+        return new_list;
+}
+
+void object_list_append(struct object *item,
+			struct object_list **list_p)
+{
+	while (*list_p) {
+		list_p = &((*list_p)->next);
+	}
+	*list_p = xmalloc(sizeof(struct object_list));
+	(*list_p)->next = NULL;
+	(*list_p)->item = item;
+}
+
+unsigned object_list_length(struct object_list *list)
+{
+	unsigned ret = 0;
+	while (list) {
+		list = list->next;
+		ret++;
+	}
+	return ret;
+}
+
+int object_list_contains(struct object_list *list, struct object *obj)
+{
+	while (list) {
+		if (list->item == obj)
+			return 1;
+		list = list->next;
+	}
+	return 0;
+}
+
+void add_object_array(struct object *obj, const char *name, struct object_array *array)
+{
+	add_object_array_with_mode(obj, name, array, S_IFINVALID);
+}
+
+void add_object_array_with_mode(struct object *obj, const char *name, struct object_array *array, unsigned mode)
+{
+	unsigned nr = array->nr;
+	unsigned alloc = array->alloc;
+	struct object_array_entry *objects = array->objects;
+
+	if (nr >= alloc) {
+		alloc = (alloc + 32) * 2;
+		objects = xrealloc(objects, alloc * sizeof(*objects));
+		array->alloc = alloc;
+		array->objects = objects;
+	}
+	objects[nr].item = obj;
+	objects[nr].name = name;
+	objects[nr].mode = mode;
+	array->nr = ++nr;
+}