Git - Object Storage

1struct object_id {
2    unsigned char hash[20];
3};
4 
5struct object {
6    unsigned parsed : 1;
7    unsigned type : 3;
8    unsigned flags : 28;
9    struct object_id oid;
10};
11 
12enum object_type {
13    OBJ_NONE = 0,
14    OBJ_COMMIT = 1,
15    OBJ_TREE = 2,
16    OBJ_BLOB = 3,
17    OBJ_TAG = 4
18};
19 
20struct object *parse_object(const struct object_id *oid)
21{
22    void *buffer;
23    unsigned long size;
24    enum object_type type;
25 
26    buffer = read_object_file(oid, &type, &size);
27    if (!buffer)
28        return NULL;
29 
30    struct object *obj = lookup_object(oid);
31    if (!obj)
32        obj = create_object(oid, type);
33 
34    if (parse_object_buffer(obj, type, size, buffer) < 0) {
35        free(buffer);
36        return NULL;
37    }
38 
39    free(buffer);
40    return obj;
41}