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66 lines
2.2 KiB
66 lines
2.2 KiB
13 years ago
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/*
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with 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,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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*/
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package org.apache.openjpa.lib.util;
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/**
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* Base 16 encoder.
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*
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* @author Marc Prud'hommeaux
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* @nojavadoc
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*/
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public class Base16Encoder {
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private final static char[] HEX = new char[]{
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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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* Convert bytes to a base16 string.
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*/
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public static String encode(byte[] byteArray) {
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StringBuffer hexBuffer = new StringBuffer(byteArray.length * 2);
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for (int i = 0; i < byteArray.length; i++)
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for (int j = 1; j >= 0; j--)
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hexBuffer.append(HEX[(byteArray[i] >> (j * 4)) & 0xF]);
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return hexBuffer.toString();
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}
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/**
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* Convert a base16 string into a byte array.
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*/
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public static byte[] decode(String s) {
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int len = s.length();
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byte[] r = new byte[len / 2];
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for (int i = 0; i < r.length; i++) {
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int digit1 = s.charAt(i * 2), digit2 = s.charAt(i * 2 + 1);
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if (digit1 >= '0' && digit1 <= '9')
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digit1 -= '0';
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else if (digit1 >= 'A' && digit1 <= 'F')
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digit1 -= 'A' - 10;
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if (digit2 >= '0' && digit2 <= '9')
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digit2 -= '0';
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else if (digit2 >= 'A' && digit2 <= 'F')
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digit2 -= 'A' - 10;
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r[i] = (byte) ((digit1 << 4) + digit2);
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}
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return r;
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}
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}
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