I'm using the ECVerify library and in the test examples in that contract, function ecverify(bytes32 hash, bytes sig, address signer) returns (bool) {} expects bytes sig in the format "\xFF\xFF\xFF...", and it does not seem to work with a bytes sig = "0xFFFFFF..." format.

How do I convert bytes32 sig = 0xaca7da997ad177f040240cdccf6905b71ab16b74434388c3a72f34fd25d6439346b2bac274ff29b48b3ea6e2d04c1336eaceafda3c53ab483fc3ff12fac3ebf200 to bytes sig = "\xac\xa7\xda...?