rand = new Random(seed);
decodePos = dpos;
decodeLen = dlen;
dataLen = elen;
if (encodeMethod.equals("jerasure")) {
rsCode = new JerasureCode();
} else {
rsCode = new ReedSolomonCode();
}
Codec rsCodec = Codec.getCodec(encodeMethod);
rsCode.init(rsCodec.stripeLength, rsCodec.parityLength);