package org.aion.ledger;

import javax.annotation.Nonnull;

public class ByteUtilities {

@Nonnull

public static byte[] merge(@Nonnull final byte[] in1, @Nonnull final byte[] in2) {

byte[] out = new byte[in1.length + in2.length];

System.arraycopy(in1, 0, out, 0, in1.length);

System.arraycopy(in2, 0, out, in1.length, in2.length);

return out;

}

@Nonnull

public static byte[] trimHead(@Nonnull final byte[] in, final int amount) {

if (amount >= in.length) {

return new byte[0];

}

byte[] out = new byte[in.length - amount];

System.arraycopy(in, amount, out, 0, in.length - amount);

return out;

}

@Nonnull

public static byte[] trimTail(@Nonnull final byte[] in, final int amount) {

if (amount >= in.length) {

return new byte[0];

}

byte[] out = new byte[in.length - amount];

System.arraycopy(in, 0, out, 0, out.length);

return out;

}

}