Function check_stream_oid

object-file.c:1548–1604

}

static int check_stream_oid(git_zstream *stream,
			    const char *hdr,
			    unsigned long size,
			    const char *path,
			    const struct object_id *expected_oid,
			    const struct git_hash_algo *algop)
{
	struct git_hash_ctx c;
	struct object_id real_oid;
	unsigned char buf[4096];
	unsigned long total_read;
	int status = Z_OK;

	algop->init_fn(&c);
	git_hash_update(&c, hdr, stream->total_out);

	/*
	 * We already read some bytes into hdr, but the ones up to the NUL
	 * do not count against the object's content size.
	 */
	total_read = stream->total_out - strlen(hdr) - 1;

	/*
	 * This size comparison must be "<=" to read the final zlib packets;
	 * see the comment in unpack_loose_rest for details.
	 */
	while (total_read <= size &&
	       (status == Z_OK ||
		(status == Z_BUF_ERROR && !stream->avail_out))) {
		stream->next_out = buf;
		stream->avail_out = sizeof(buf);
		if (size - total_read < stream->avail_out)
			stream->avail_out = size - total_read;
		status = git_inflate(stream, Z_FINISH);
		git_hash_update(&c, buf, stream->next_out - buf);
		total_read += stream->next_out - buf;
	}

	if (status != Z_STREAM_END) {
		error(_("corrupt loose object '%s'"), oid_to_hex(expected_oid));
		return -1;
	}
	if (stream->avail_in) {
		error(_("garbage at end of loose object '%s'"),
		      oid_to_hex(expected_oid));
		return -1;
	}

	git_hash_final_oid(&real_oid, &c);
	if (!oideq(expected_oid, &real_oid)) {
		error(_("hash mismatch for %s (expected %s)"), path,
		      oid_to_hex(expected_oid));
		return -1;
	}

	return 0;
}