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303 lines
12 KiB
Java
303 lines
12 KiB
Java
// Mozilla has modified this file - see http://hg.mozilla.org/ for details.
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/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.mozilla.apache.commons.codec.binary;
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import java.io.UnsupportedEncodingException;
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import org.mozilla.apache.commons.codec.BinaryDecoder;
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import org.mozilla.apache.commons.codec.BinaryEncoder;
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import org.mozilla.apache.commons.codec.CharEncoding;
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import org.mozilla.apache.commons.codec.DecoderException;
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import org.mozilla.apache.commons.codec.EncoderException;
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/**
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* Converts hexadecimal Strings. The charset used for certain operation can be set, the default is set in
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* {@link #DEFAULT_CHARSET_NAME}
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*
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* @since 1.1
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* @author Apache Software Foundation
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* @version $Id: Hex.java 1080701 2011-03-11 17:52:27Z ggregory $
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*/
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public class Hex implements BinaryEncoder, BinaryDecoder {
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/**
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* Default charset name is {@link CharEncoding#UTF_8}
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*
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* @since 1.4
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*/
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public static final String DEFAULT_CHARSET_NAME = CharEncoding.UTF_8;
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/**
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* Used to build output as Hex
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*/
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private static final char[] DIGITS_LOWER = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
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/**
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* Used to build output as Hex
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*/
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private static final char[] DIGITS_UPPER = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'};
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/**
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* Converts an array of characters representing hexadecimal values into an array of bytes of those same values. The
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* returned array will be half the length of the passed array, as it takes two characters to represent any given
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* byte. An exception is thrown if the passed char array has an odd number of elements.
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*
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* @param data
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* An array of characters containing hexadecimal digits
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* @return A byte array containing binary data decoded from the supplied char array.
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* @throws DecoderException
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* Thrown if an odd number or illegal of characters is supplied
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*/
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public static byte[] decodeHex(char[] data) throws DecoderException {
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int len = data.length;
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if ((len & 0x01) != 0) {
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throw new DecoderException("Odd number of characters.");
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}
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byte[] out = new byte[len >> 1];
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// two characters form the hex value.
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for (int i = 0, j = 0; j < len; i++) {
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int f = toDigit(data[j], j) << 4;
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j++;
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f = f | toDigit(data[j], j);
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j++;
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out[i] = (byte) (f & 0xFF);
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}
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return out;
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}
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/**
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* Converts an array of bytes into an array of characters representing the hexadecimal values of each byte in order.
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* The returned array will be double the length of the passed array, as it takes two characters to represent any
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* given byte.
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*
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* @param data
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* a byte[] to convert to Hex characters
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* @return A char[] containing hexadecimal characters
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*/
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public static char[] encodeHex(byte[] data) {
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return encodeHex(data, true);
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}
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/**
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* Converts an array of bytes into an array of characters representing the hexadecimal values of each byte in order.
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* The returned array will be double the length of the passed array, as it takes two characters to represent any
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* given byte.
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*
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* @param data
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* a byte[] to convert to Hex characters
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* @param toLowerCase
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* <code>true</code> converts to lowercase, <code>false</code> to uppercase
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* @return A char[] containing hexadecimal characters
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* @since 1.4
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*/
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public static char[] encodeHex(byte[] data, boolean toLowerCase) {
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return encodeHex(data, toLowerCase ? DIGITS_LOWER : DIGITS_UPPER);
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}
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/**
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* Converts an array of bytes into an array of characters representing the hexadecimal values of each byte in order.
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* The returned array will be double the length of the passed array, as it takes two characters to represent any
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* given byte.
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*
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* @param data
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* a byte[] to convert to Hex characters
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* @param toDigits
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* the output alphabet
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* @return A char[] containing hexadecimal characters
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* @since 1.4
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*/
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protected static char[] encodeHex(byte[] data, char[] toDigits) {
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int l = data.length;
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char[] out = new char[l << 1];
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// two characters form the hex value.
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for (int i = 0, j = 0; i < l; i++) {
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out[j++] = toDigits[(0xF0 & data[i]) >>> 4];
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out[j++] = toDigits[0x0F & data[i]];
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}
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return out;
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}
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/**
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* Converts an array of bytes into a String representing the hexadecimal values of each byte in order. The returned
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* String will be double the length of the passed array, as it takes two characters to represent any given byte.
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*
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* @param data
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* a byte[] to convert to Hex characters
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* @return A String containing hexadecimal characters
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* @since 1.4
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*/
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public static String encodeHexString(byte[] data) {
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return new String(encodeHex(data));
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}
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/**
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* Converts a hexadecimal character to an integer.
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*
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* @param ch
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* A character to convert to an integer digit
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* @param index
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* The index of the character in the source
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* @return An integer
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* @throws DecoderException
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* Thrown if ch is an illegal hex character
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*/
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protected static int toDigit(char ch, int index) throws DecoderException {
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int digit = Character.digit(ch, 16);
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if (digit == -1) {
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throw new DecoderException("Illegal hexadecimal character " + ch + " at index " + index);
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}
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return digit;
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}
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private final String charsetName;
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/**
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* Creates a new codec with the default charset name {@link #DEFAULT_CHARSET_NAME}
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*/
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public Hex() {
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// use default encoding
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this.charsetName = DEFAULT_CHARSET_NAME;
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}
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/**
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* Creates a new codec with the given charset name.
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*
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* @param csName
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* the charset name.
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* @since 1.4
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*/
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public Hex(String csName) {
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this.charsetName = csName;
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}
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/**
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* Converts an array of character bytes representing hexadecimal values into an array of bytes of those same values.
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* The returned array will be half the length of the passed array, as it takes two characters to represent any given
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* byte. An exception is thrown if the passed char array has an odd number of elements.
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*
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* @param array
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* An array of character bytes containing hexadecimal digits
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* @return A byte array containing binary data decoded from the supplied byte array (representing characters).
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* @throws DecoderException
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* Thrown if an odd number of characters is supplied to this function
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* @see #decodeHex(char[])
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*/
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public byte[] decode(byte[] array) throws DecoderException {
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try {
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return decodeHex(new String(array, getCharsetName()).toCharArray());
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} catch (UnsupportedEncodingException e) {
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throw new DecoderException(e.getMessage(), e);
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}
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}
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/**
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* Converts a String or an array of character bytes representing hexadecimal values into an array of bytes of those
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* same values. The returned array will be half the length of the passed String or array, as it takes two characters
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* to represent any given byte. An exception is thrown if the passed char array has an odd number of elements.
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*
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* @param object
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* A String or, an array of character bytes containing hexadecimal digits
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* @return A byte array containing binary data decoded from the supplied byte array (representing characters).
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* @throws DecoderException
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* Thrown if an odd number of characters is supplied to this function or the object is not a String or
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* char[]
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* @see #decodeHex(char[])
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*/
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public Object decode(Object object) throws DecoderException {
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try {
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char[] charArray = object instanceof String ? ((String) object).toCharArray() : (char[]) object;
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return decodeHex(charArray);
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} catch (ClassCastException e) {
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throw new DecoderException(e.getMessage(), e);
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}
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}
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/**
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* Converts an array of bytes into an array of bytes for the characters representing the hexadecimal values of each
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* byte in order. The returned array will be double the length of the passed array, as it takes two characters to
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* represent any given byte.
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* <p>
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* The conversion from hexadecimal characters to the returned bytes is performed with the charset named by
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* {@link #getCharsetName()}.
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* </p>
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*
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* @param array
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* a byte[] to convert to Hex characters
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* @return A byte[] containing the bytes of the hexadecimal characters
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* @throws IllegalStateException
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* if the charsetName is invalid. This API throws {@link IllegalStateException} instead of
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* {@link UnsupportedEncodingException} for backward compatibility.
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* @see #encodeHex(byte[])
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*/
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public byte[] encode(byte[] array) {
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return StringUtils.getBytesUnchecked(encodeHexString(array), getCharsetName());
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}
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/**
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* Converts a String or an array of bytes into an array of characters representing the hexadecimal values of each
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* byte in order. The returned array will be double the length of the passed String or array, as it takes two
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* characters to represent any given byte.
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* <p>
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* The conversion from hexadecimal characters to bytes to be encoded to performed with the charset named by
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* {@link #getCharsetName()}.
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* </p>
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*
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* @param object
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* a String, or byte[] to convert to Hex characters
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* @return A char[] containing hexadecimal characters
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* @throws EncoderException
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* Thrown if the given object is not a String or byte[]
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* @see #encodeHex(byte[])
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*/
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public Object encode(Object object) throws EncoderException {
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try {
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byte[] byteArray = object instanceof String ? ((String) object).getBytes(getCharsetName()) : (byte[]) object;
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return encodeHex(byteArray);
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} catch (ClassCastException e) {
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throw new EncoderException(e.getMessage(), e);
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} catch (UnsupportedEncodingException e) {
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throw new EncoderException(e.getMessage(), e);
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}
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}
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/**
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* Gets the charset name.
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*
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* @return the charset name.
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* @since 1.4
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*/
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public String getCharsetName() {
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return this.charsetName;
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}
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/**
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* Returns a string representation of the object, which includes the charset name.
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*
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* @return a string representation of the object.
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*/
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public String toString() {
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return super.toString() + "[charsetName=" + this.charsetName + "]";
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}
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}
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