Java Hex Calculate toHexText(byte[] bytes, int length)

Description

Converts the specified byte array up to the specified length into a hexadecimal text.

License

Open Source License

Parameter

Parameter	Description
bytes	the array of bytes. If null, the text "null" is returned.
length	length up to the bytes should be converted into hexadecimal text. If larger then the array length, reduce it to the array length.

Return

byte array as hexadecimal text

Declaration

public static String toHexText(byte[] bytes, int length) 

Method Source Code

//package com.java2s;
/*******************************************************************************
 * Copyright (c) 2015 Institute for Pervasive Computing, ETH Zurich and others.
 * //ww  w .  j  a  v  a  2 s  .  co  m
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * and Eclipse Distribution License v1.0 which accompany this distribution.
 * 
 * The Eclipse Public License is available at
 *    http://www.eclipse.org/legal/epl-v10.html
 * and the Eclipse Distribution License is available at
 *    http://www.eclipse.org/org/documents/edl-v10.html.
 * 
 * Contributors:
 *    Matthias Kovatsch - creator and main architect
 *    Martin Lanter - architect and re-implementation
 *    Dominique Im Obersteg - parsers and initial implementation
 *    Daniel Pauli - parsers and initial implementation
 *    Kai Hudalla - logging
 *    Achim Kraus (Bosch Software Innovations GmbH) - add toHexText 
 *                                                    (for message tracing)
 ******************************************************************************/

public class Main {
    /**
     * Converts the specified byte array up to the specified length into a hexadecimal text.
     * Separate bytes by spaces and group them in lines. Append length of array, if specified 
     * length is smaller then the length of the array.
     * 
     * @param bytes the array of bytes. If null, the text "null" is returned.
     * @param length length up to the bytes should be converted into hexadecimal text. 
     *               If larger then the array length, reduce it to the array length.
     * @return byte array as hexadecimal text
     */
    public static String toHexText(byte[] bytes, int length) {
        if (bytes == null)
            return "null";
        if (length > bytes.length)
            length = bytes.length;
        StringBuilder sb = new StringBuilder();
        if (16 < length)
            sb.append('\n');
        for (int index = 0; index < length; ++index) {
            sb.append(String.format("%02x", bytes[index] & 0xFF));
            if (31 == (31 & index)) {
                sb.append('\n');
            } else {
                sb.append(' ');
            }
        }
        if (length < bytes.length) {
            sb.append(" .. ").append(bytes.length).append(" bytes");
        }
        return sb.toString();
    }
}

Related

1. toHexString3(byte aByte)
2. toHexStringBE(char[] array)
3. toHexStringLE(byte n)
4. toHexStringUpperCase(byte[] b)
5. toHexTable(byte[] byteSrc, int lengthOfLine)
6. toHexUtil(int n)
7. toHexValue(int number)
8. toHexWithMarker(byte b)