Function parse_oid_prefix

object-name.c:232–266

}

static int parse_oid_prefix(const char *name, int len,
			    const struct git_hash_algo *algo,
			    char *hex_out,
			    struct object_id *oid_out)
{
	for (int i = 0; i < len; i++) {
		unsigned char c = name[i];
		unsigned char val;
		if (c >= '0' && c <= '9') {
			val = c - '0';
		} else if (c >= 'a' && c <= 'f') {
			val = c - 'a' + 10;
		} else if (c >= 'A' && c <='F') {
			val = c - 'A' + 10;
			c -= 'A' - 'a';
		} else {
			return -1;
		}

		if (hex_out)
			hex_out[i] = c;
		if (oid_out) {
			if (!(i & 1))
				val <<= 4;
			oid_out->hash[i >> 1] |= val;
		}
	}

	if (hex_out)
		hex_out[len] = '\0';
	if (oid_out)
		oid_out->algo = algo ? hash_algo_by_ptr(algo) : GIT_HASH_UNKNOWN;

	return 0;
}

static int init_object_disambiguation(struct repository *r,
				      const char *name, int len,