/* * Copyright 2019 ConsenSys AG. * * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the * specific language governing permissions and limitations under the License. */ package tech.pegasys.teku.ssz.SSZTypes; import static com.google.common.base.Preconditions.checkArgument; import static com.google.common.base.Preconditions.checkNotNull; import java.util.Objects; import org.apache.tuweni.bytes.Bytes; import org.apache.tuweni.bytes.MutableBytes; public class Bytes4 { private Bytes bytes; public Bytes4(Bytes bytes) { checkArgument(bytes.size() == 4, "Bytes4 should be 4 bytes, but was %s bytes.", bytes.size()); this.bytes = bytes; } public static Bytes4 fromHexString(String value) { return new Bytes4(Bytes.fromHexString(value)); } public String toHexString() { return bytes.toHexString(); } /** * Left pad a {@link Bytes} value with zero bytes to create a {@link Bytes4}. * * @param value The bytes value pad. * @return A {@link Bytes4} that exposes the left-padded bytes of {@code value}. * @throws IllegalArgumentException if {@code value.size() > 4}. */ public static Bytes4 leftPad(Bytes value) { checkNotNull(value); if (value instanceof Bytes4) { return (Bytes4) value; } checkArgument(value.size() <= 4, "Expected at most %s bytes but got %s", 4, value.size()); MutableBytes result = MutableBytes.create(4); value.copyTo(result, 4 - value.size()); return new Bytes4(result); } /** * Right pad a {@link Bytes} value with zero bytes to create a {@link Bytes4}. * * @param value The bytes value pad. * @return A {@link Bytes4} that exposes the right-padded bytes of {@code value}. * @throws IllegalArgumentException if {@code value.size() > 4}. */ public static Bytes4 rightPad(Bytes value) { checkNotNull(value); if (value instanceof Bytes4) { return (Bytes4) value; } checkArgument(value.size() <= 4, "Expected at most %s bytes but got %s", 4, value.size()); MutableBytes result = MutableBytes.create(4); value.copyTo(result, 0); return new Bytes4(result); } public Bytes getWrappedBytes() { return bytes; } public Bytes4 copy() { return new Bytes4(bytes.copy()); } @Override public boolean equals(final Object o) { if (this == o) { return true; } if (o == null || getClass() != o.getClass()) { return false; } final Bytes4 bytes4 = (Bytes4) o; return bytes.equals(bytes4.bytes); } @Override public int hashCode() { return Objects.hash(bytes); } public String toUnprefixedHexString() { return bytes.toUnprefixedHexString(); } @Override public String toString() { return bytes.toString(); } }