/**
* Decode the base-64 encoded text into a byte array, check the magic string at the start of the
* file, and decompress it.
*
* @param base64Data the base64 data to decode
* @return the byte array containing the decoded data.
* @throws an exception if it is not an MVD file
*/
private static byte[] base64Decode(String base64Data) throws Exception {
byte[] data = Base64.decode(base64Data);
if (!magicOK(data)) throw new MVDException("Not a valid MVD file");
return data;
}
