/*
* Copyright (c) [2016] [ <ether.camp> ]
* This file is part of the ethereumJ library.
*
* The ethereumJ library is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* The ethereumJ library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with the ethereumJ library. If not, see <http://www.gnu.org/licenses/>.
*/
package org.ethereum.config.blockchain;
import org.apache.commons.lang3.ArrayUtils;
import org.ethereum.config.Constants;
import org.ethereum.core.BlockHeader;
import org.ethereum.core.Transaction;
import java.math.BigInteger;
/**
* Created by Anton Nashatyrev on 25.02.2016.
*/
public class HomesteadConfig extends FrontierConfig {
static final BigInteger SECP256K1N_HALF = Constants.getSECP256K1N().divide(BigInteger.valueOf(2));
public static class HomesteadConstants extends FrontierConstants {
@Override
public boolean createEmptyContractOnOOG() {
return false;
}
@Override
public boolean hasDelegateCallOpcode() {
return true;
}
};
public HomesteadConfig() {
this(new HomesteadConstants());
}
public HomesteadConfig(Constants constants) {
super(constants);
}
@Override
protected BigInteger getCalcDifficultyMultiplier(BlockHeader curBlock, BlockHeader parent) {
return BigInteger.valueOf(Math.max(1 - (curBlock.getTimestamp() - parent.getTimestamp()) / 10, -99));
}
@Override
public long getTransactionCost(Transaction tx) {
long nonZeroes = tx.nonZeroDataBytes();
long zeroVals = ArrayUtils.getLength(tx.getData()) - nonZeroes;
return (tx.isContractCreation() ? getGasCost().getTRANSACTION_CREATE_CONTRACT() : getGasCost().getTRANSACTION())
+ zeroVals * getGasCost().getTX_ZERO_DATA() + nonZeroes * getGasCost().getTX_NO_ZERO_DATA();
}
@Override
public boolean acceptTransactionSignature(Transaction tx) {
if (!super.acceptTransactionSignature(tx)) return false;
return tx.getSignature().s.compareTo(SECP256K1N_HALF) <= 0;
}
}