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-rw-r--r--object.c270
1 files changed, 270 insertions, 0 deletions
diff --git a/object.c b/object.c
new file mode 100644
index 000000000..50b652800
--- /dev/null
+++ b/object.c
@@ -0,0 +1,270 @@
+#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;
+
+ obj = NULL;
+ if (type == OBJ_BLOB) {
+ struct blob *blob = lookup_blob(sha1);
+ if (blob) {
+ if (parse_blob_buffer(blob, buffer, size))
+ return NULL;
+ obj = &blob->object;
+ }
+ } else if (type == OBJ_TREE) {
+ struct tree *tree = lookup_tree(sha1);
+ if (tree) {
+ obj = &tree->object;
+ if (!tree->object.parsed) {
+ if (parse_tree_buffer(tree, buffer, size))
+ return NULL;
+ eaten = 1;
+ }
+ }
+ } else if (type == OBJ_COMMIT) {
+ struct commit *commit = lookup_commit(sha1);
+ if (commit) {
+ if (parse_commit_buffer(commit, buffer, size))
+ return NULL;
+ if (!commit->buffer) {
+ commit->buffer = buffer;
+ eaten = 1;
+ }
+ obj = &commit->object;
+ }
+ } else if (type == OBJ_TAG) {
+ struct tag *tag = lookup_tag(sha1);
+ if (tag) {
+ if (parse_tag_buffer(tag, buffer, size))
+ return NULL;
+ 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;
+}