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Moving files around
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Erlend Hamnaberg
149
common/common-io/src/main/java/com/twelvemonkeys/util/BASE64.java
Executable file
149
common/common-io/src/main/java/com/twelvemonkeys/util/BASE64.java
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/*
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* Copyright (c) 2008, Harald Kuhr
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name "TwelveMonkeys" nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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package com.twelvemonkeys.util;
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import com.twelvemonkeys.io.*;
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import com.twelvemonkeys.io.enc.Base64Decoder;
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import com.twelvemonkeys.io.enc.DecoderStream;
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import java.io.*;
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/**
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* This class does BASE64 encoding (and decoding).
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*
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* @author unascribed
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* @author last modified by $Author: haku $
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* @version $Id: //depot/branches/personal/haraldk/twelvemonkeys/release-2/twelvemonkeys-core/src/main/java/com/twelvemonkeys/util/BASE64.java#1 $
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*/
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public class BASE64 {
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/**
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* This array maps the characters to their 6 bit values
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*/
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private final static char[] PEM_ARRAY = {
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//0 1 2 3 4 5 6 7
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'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', // 0
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'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', // 1
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'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', // 2
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'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', // 3
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'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', // 4
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'o', 'p', 'q', 'r', 's', 't', 'u', 'v', // 5
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'w', 'x', 'y', 'z', '0', '1', '2', '3', // 6
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'4', '5', '6', '7', '8', '9', '+', '/' // 7
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};
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/**
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* Encodes the input data using the standard base64 encoding scheme.
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*
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* @param pData the bytes to encode to base64
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* @return a string with base64 encoded data
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*/
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public static String encode(byte[] pData) {
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int offset = 0;
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int len;
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StringBuilder buf = new StringBuilder();
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while ((pData.length - offset) > 0) {
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byte a, b, c;
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if ((pData.length - offset) > 2) {
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len = 3;
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}
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else {
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len = pData.length - offset;
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}
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switch (len) {
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case 1:
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a = pData[offset];
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b = 0;
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buf.append(PEM_ARRAY[(a >>> 2) & 0x3F]);
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buf.append(PEM_ARRAY[((a << 4) & 0x30) + ((b >>> 4) & 0xf)]);
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buf.append('=');
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buf.append('=');
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offset++;
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break;
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case 2:
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a = pData[offset];
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b = pData[offset + 1];
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c = 0;
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buf.append(PEM_ARRAY[(a >>> 2) & 0x3F]);
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buf.append(PEM_ARRAY[((a << 4) & 0x30) + ((b >>> 4) & 0xf)]);
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buf.append(PEM_ARRAY[((b << 2) & 0x3c) + ((c >>> 6) & 0x3)]);
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buf.append('=');
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offset += offset + 2; // ???
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break;
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default:
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a = pData[offset];
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b = pData[offset + 1];
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c = pData[offset + 2];
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buf.append(PEM_ARRAY[(a >>> 2) & 0x3F]);
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buf.append(PEM_ARRAY[((a << 4) & 0x30) + ((b >>> 4) & 0xf)]);
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buf.append(PEM_ARRAY[((b << 2) & 0x3c) + ((c >>> 6) & 0x3)]);
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buf.append(PEM_ARRAY[c & 0x3F]);
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offset = offset + 3;
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break;
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}
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}
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return buf.toString();
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}
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/**
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* Quick implementation, using the undocumented
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* {@code sun.misc.BASE64Decoder.decodeBuffer(String)}.
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*/
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public static byte[] decode(String pData) throws java.io.IOException {
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//return DECODER.decodeBuffer(pData);
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InputStream in = new DecoderStream(new ByteArrayInputStream(pData.getBytes()), new Base64Decoder());
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ByteArrayOutputStream bytes = new FastByteArrayOutputStream(pData.length() * 3);
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FileUtil.copy(in, bytes);
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return bytes.toByteArray();
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}
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//private final static sun.misc.BASE64Decoder DECODER = new sun.misc.BASE64Decoder();
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public static void main(String[] pArgs) throws java.io.IOException {
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if (pArgs.length == 1) {
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System.out.println(encode(pArgs[0].getBytes()));
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}
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else
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if (pArgs.length == 2 && ("-d".equals(pArgs[0]) || "--decode".equals(pArgs[0])))
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{
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System.out.println(new String(decode(pArgs[1])));
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}
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else {
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System.err.println("BASE64 [ -d | --decode ] arg");
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System.err.println("Encodes or decodes a given string");
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System.exit(5);
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}
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}
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}
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