mirror of https://github.com/moparisthebest/k-9
57 lines
1.7 KiB
Java
57 lines
1.7 KiB
Java
/*
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* Copyright 2001-2004 The Apache Software Foundation.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* 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 com.fsck.k9.mail.filter;
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/**
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* This code was copied from the Apache Commons project.
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* The unnecessary parts have been left out.
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*/
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public class Hex {
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/**
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* Used building output as Hex
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*/
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private static final char[] DIGITS = {
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'0', '1', '2', '3', '4', '5', '6', '7',
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'8', '9', 'a', 'b', 'c', 'd', 'e', 'f'
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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 lower-case hexadecimal characters
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*/
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public static char[] encodeHex(byte[] data) {
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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++] = DIGITS[(0xF0 & data[i]) >>> 4 ];
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out[j++] = DIGITS[ 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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