org.apache.openejb.util.HexConverter Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.openejb.util;
public class HexConverter {
private HexConverter() {
// Disallow instantiation
}
/**
* Converts a byte array to its hexadecimal string representation, ie.
* new byte[] { 127, 0, 10 } returns "7F000A".
*
* @param bytes an array of bytes
* @return hexadecimal string representation of the first argument
*/
public static String bytesToHex(byte[] bytes) {
StringBuilder buf = new StringBuilder(bytes.length * 2);
for (byte b : bytes) {
buf.append(String.format("%02X", b));
}
return buf.toString();
}
/**
* Converts a hexadecimal formatted string into a corresponding byte array.
*
* @param hexString a hexadecimal representation of a byte array
* @return an array of bytes created from the input
*/
public static byte[] hexToBytes(String hexString) {
if (hexString.length() % 2 != 0) {
throw new IllegalArgumentException("Invalid number of digits: input must be a string of hexadecimal digit pairs");
}
byte[] bytes = new byte[hexString.length() / 2];
for (int i = 0; i < bytes.length; i++) {
bytes[i] = (byte) Integer.parseInt(hexString.substring(i * 2, i * 2 + 2), 16);
}
return bytes;
}
}