Function get_data

builtin/unpack-objects.c:117–158

* Decompress zstream from the standard input into a newly * allocated buffer of specified size and return the buffer. * The caller is responsible to free the returned buffer. * * But for dry_run mode, "get_data()" is only used to check the * integrity of data, and the returned buffer is not used at all. * Therefore, in dry_run mode, "get_data()" will release the small * allocated buffer whi

 * and return NULL instead of returning garbage data.
 */
static void *get_data(unsigned long size)
{
	git_zstream stream;
	unsigned long bufsize = dry_run && size > 8192 ? 8192 : size;
	void *buf = xmallocz(bufsize);

	memset(&stream, 0, sizeof(stream));

	stream.next_out = buf;
	stream.avail_out = bufsize;
	stream.next_in = fill(1);
	stream.avail_in = len;
	git_inflate_init(&stream);

	for (;;) {
		int ret = git_inflate(&stream, 0);
		use(len - stream.avail_in);
		if (stream.total_out == size && ret == Z_STREAM_END)
			break;
		if (ret != Z_OK) {
			error("inflate returned %d", ret);
			FREE_AND_NULL(buf);
			if (!recover)
				exit(1);
			has_errors = 1;
			break;
		}
		stream.next_in = fill(1);
		stream.avail_in = len;
		if (dry_run) {
			/* reuse the buffer in dry_run mode */
			stream.next_out = buf;
			stream.avail_out = bufsize > size - stream.total_out ?
						   size - stream.total_out :
						   bufsize;
		}
	}
	git_inflate_end(&stream);
	if (dry_run)
		FREE_AND_NULL(buf);
	return buf;
}

struct delta_info {
	struct object_id base_oid;