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477 lines
14 KiB
477 lines
14 KiB
/*
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* Jitsi, the OpenSource Java VoIP and Instant Messaging client.
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*
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* Distributable under LGPL license.
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* See terms of license at gnu.org.
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*
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* The contents of this file has been copied from the Base64 and Base64Encoder
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* classes of the Bouncy Castle libraries and included the following license.
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*
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* Copyright (c) 2000 - 2006 The Legion Of The Bouncy Castle
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* (http://www.bouncycastle.org)
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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package net.java.sip.communicator.util;
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import java.io.*;
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public class Base64
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{
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private static final Base64Encoder encoder = new Base64Encoder();
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/**
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* encode the input data producing a base 64 encoded byte array.
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*
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* @return a byte array containing the base 64 encoded data.
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* @param data the byte array to encode
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*/
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public static byte[] encode(
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byte[] data)
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{
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ByteArrayOutputStream bOut = new ByteArrayOutputStream();
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try
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{
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encoder.encode(data, 0, data.length, bOut);
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}
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catch (IOException e)
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{
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throw new RuntimeException("exception encoding base64 string: " + e);
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}
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return bOut.toByteArray();
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}
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/**
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* Encode the byte data to base 64 writing it to the given output stream.
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*
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* @param data the byte array to encode
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* @param out the output stream where the result is to be written.
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*
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* @return the number of bytes produced.
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*
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* @throws IOException if the output stream throws one
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*/
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public static int encode(
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byte[] data,
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OutputStream out)
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throws IOException
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{
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return encoder.encode(data, 0, data.length, out);
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}
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/**
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* Encode the byte data to base 64 writing it to the given output stream.
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*
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* @return the number of bytes produced.
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* @param data the byte array to encode
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* @param off offset
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* @param length length
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* @param out OutputStream
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* @throws IOException
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*/
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public static int encode(
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byte[] data,
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int off,
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int length,
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OutputStream out)
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throws IOException
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{
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return encoder.encode(data, off, length, out);
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}
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/**
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* decode the base 64 encoded input data. It is assumed the input data is
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* valid.
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*
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* @return a byte array representing the decoded data.
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* @param data the byte array to encode
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*/
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public static byte[] decode(
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byte[] data)
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{
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ByteArrayOutputStream bOut = new ByteArrayOutputStream();
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try
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{
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encoder.decode(data, 0, data.length, bOut);
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}
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catch (IOException e)
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{
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throw new RuntimeException("exception decoding base64 string: " + e);
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}
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return bOut.toByteArray();
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}
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/**
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* decode the base 64 encoded String data - whitespace will be ignored.
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*
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* @param data the byte array to encode
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* @return a byte array representing the decoded data.
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*/
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public static byte[] decode(
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String data)
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{
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ByteArrayOutputStream bOut = new ByteArrayOutputStream();
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try
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{
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encoder.decode(data, bOut);
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}
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catch (IOException e)
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{
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throw new RuntimeException("exception decoding base64 string: " + e);
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}
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return bOut.toByteArray();
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}
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/**
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* decode the base 64 encoded String data writing it to the given output stream,
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* whitespace characters will be ignored.
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*
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* @param data the data to decode
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* @param out OutputStream
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* @return the number of bytes produced.
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* @throws IOException if an exception occurs while writing to the specified
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* output stream
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*/
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public static int decode(
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String data,
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OutputStream out)
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throws IOException
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{
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return encoder.decode(data, out);
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}
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/** Prevents the initialization of <tt>Base64</tt> instances. */
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private Base64() {}
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public static class Base64Encoder
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{
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protected final byte[] encodingTable =
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{
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(byte)'A', (byte)'B', (byte)'C', (byte)'D', (byte)'E', (byte)'F', (byte)'G',
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(byte)'H', (byte)'I', (byte)'J', (byte)'K', (byte)'L', (byte)'M', (byte)'N',
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(byte)'O', (byte)'P', (byte)'Q', (byte)'R', (byte)'S', (byte)'T', (byte)'U',
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(byte)'V', (byte)'W', (byte)'X', (byte)'Y', (byte)'Z',
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(byte)'a', (byte)'b', (byte)'c', (byte)'d', (byte)'e', (byte)'f', (byte)'g',
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(byte)'h', (byte)'i', (byte)'j', (byte)'k', (byte)'l', (byte)'m', (byte)'n',
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(byte)'o', (byte)'p', (byte)'q', (byte)'r', (byte)'s', (byte)'t', (byte)'u',
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(byte)'v',
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(byte)'w', (byte)'x', (byte)'y', (byte)'z',
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(byte)'0', (byte)'1', (byte)'2', (byte)'3', (byte)'4', (byte)'5', (byte)'6',
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(byte)'7', (byte)'8', (byte)'9',
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(byte)'+', (byte)'/'
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};
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protected byte padding = (byte) '=';
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/*
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* set up the decoding table.
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*/
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protected final byte[] decodingTable = new byte[128];
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protected void initialiseDecodingTable()
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{
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for (int i = 0; i < encodingTable.length; i++)
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{
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decodingTable[encodingTable[i]] = (byte) i;
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}
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}
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public Base64Encoder()
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{
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initialiseDecodingTable();
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}
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/**
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* encode the input data producing a base 64 output stream.
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*
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* @return the number of bytes produced.
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* @param data the byte array to encode
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* @param off offset
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* @param length length
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* @param out OutputStream
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* @throws IOException if an exception occurs while writing to the
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* stream.
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*/
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public int encode(
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byte[] data,
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int off,
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int length,
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OutputStream out) throws IOException
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{
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int modulus = length % 3;
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int dataLength = (length - modulus);
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int a1, a2, a3;
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for (int i = off; i < off + dataLength; i += 3)
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{
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a1 = data[i] & 0xff;
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a2 = data[i + 1] & 0xff;
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a3 = data[i + 2] & 0xff;
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out.write(encodingTable[ (a1 >>> 2) & 0x3f]);
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out.write(encodingTable[ ( (a1 << 4) | (a2 >>> 4)) & 0x3f]);
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out.write(encodingTable[ ( (a2 << 2) | (a3 >>> 6)) & 0x3f]);
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out.write(encodingTable[a3 & 0x3f]);
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}
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/*
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* process the tail end.
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*/
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int b1, b2, b3;
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int d1, d2;
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switch (modulus)
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{
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case 0: /* nothing left to do */
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break;
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case 1:
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d1 = data[off + dataLength] & 0xff;
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b1 = (d1 >>> 2) & 0x3f;
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b2 = (d1 << 4) & 0x3f;
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out.write(encodingTable[b1]);
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out.write(encodingTable[b2]);
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out.write(padding);
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out.write(padding);
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break;
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case 2:
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d1 = data[off + dataLength] & 0xff;
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d2 = data[off + dataLength + 1] & 0xff;
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b1 = (d1 >>> 2) & 0x3f;
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b2 = ( (d1 << 4) | (d2 >>> 4)) & 0x3f;
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b3 = (d2 << 2) & 0x3f;
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out.write(encodingTable[b1]);
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out.write(encodingTable[b2]);
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out.write(encodingTable[b3]);
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out.write(padding);
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break;
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}
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return (dataLength / 3) * 4 + ( (modulus == 0) ? 0 : 4);
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}
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private boolean ignore(
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char c)
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{
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return (c == '\n' || c == '\r' || c == '\t' || c == ' ');
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}
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/**
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* decode the base 64 encoded byte data writing it to the given output
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* stream, whitespace characters will be ignored.
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*
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* @return the number of bytes produced.
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* @param data the byte array to encode
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* @param off offset
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* @param length length
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* @param out OutputStream
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* @throws IOException if an exception occurs while wrinting to the
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* stream.
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*/
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public int decode(
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byte[] data,
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int off,
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int length,
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OutputStream out) throws IOException
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{
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byte b1, b2, b3, b4;
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int outLen = 0;
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int end = off + length;
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while (end > off)
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{
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if (!ignore( (char) data[end - 1]))
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{
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break;
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}
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end--;
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}
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int i = off;
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int finish = end - 4;
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i = nextI(data, i, finish);
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while (i < finish)
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{
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b1 = decodingTable[data[i++]];
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i = nextI(data, i, finish);
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b2 = decodingTable[data[i++]];
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i = nextI(data, i, finish);
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b3 = decodingTable[data[i++]];
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i = nextI(data, i, finish);
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b4 = decodingTable[data[i++]];
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out.write( (b1 << 2) | (b2 >> 4));
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out.write( (b2 << 4) | (b3 >> 2));
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out.write( (b3 << 6) | b4);
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outLen += 3;
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i = nextI(data, i, finish);
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}
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outLen +=
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decodeLastBlock(out, (char) data[end - 4], (char) data[end - 3],
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(char) data[end - 2], (char) data[end - 1]);
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return outLen;
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}
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private int nextI(byte[] data, int i, int finish)
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{
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while ( (i < finish) && ignore( (char) data[i]))
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{
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i++;
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}
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return i;
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}
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/**
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* decode the base 64 encoded String data writing it to the given output
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* stream, whitespace characters will be ignored.
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*
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* @return the number of bytes produced.
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* @param data the byte array to encode
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* @param out OutputStream
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* @throws IOException if an exception occurs while writing to the
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* stream
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*/
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public int decode(
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String data,
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OutputStream out) throws IOException
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{
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byte b1, b2, b3, b4;
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int length = 0;
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int end = data.length();
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while (end > 0)
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{
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if (!ignore(data.charAt(end - 1)))
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{
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break;
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}
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end--;
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}
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int i = 0;
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int finish = end - 4;
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i = nextI(data, i, finish);
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while (i < finish)
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{
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b1 = decodingTable[data.charAt(i++)];
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i = nextI(data, i, finish);
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b2 = decodingTable[data.charAt(i++)];
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i = nextI(data, i, finish);
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b3 = decodingTable[data.charAt(i++)];
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i = nextI(data, i, finish);
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b4 = decodingTable[data.charAt(i++)];
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out.write( (b1 << 2) | (b2 >> 4));
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out.write( (b2 << 4) | (b3 >> 2));
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out.write( (b3 << 6) | b4);
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length += 3;
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i = nextI(data, i, finish);
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}
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length +=
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decodeLastBlock(out, data.charAt(end - 4), data.charAt(end - 3),
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data.charAt(end - 2), data.charAt(end - 1));
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return length;
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}
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private int decodeLastBlock(OutputStream out, char c1, char c2, char c3,
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char c4) throws IOException
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{
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byte b1, b2, b3, b4;
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if (c3 == padding)
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{
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b1 = decodingTable[c1];
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b2 = decodingTable[c2];
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out.write( (b1 << 2) | (b2 >> 4));
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return 1;
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}
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else if (c4 == padding)
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{
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b1 = decodingTable[c1];
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b2 = decodingTable[c2];
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b3 = decodingTable[c3];
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out.write( (b1 << 2) | (b2 >> 4));
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out.write( (b2 << 4) | (b3 >> 2));
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return 2;
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}
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else
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{
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b1 = decodingTable[c1];
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b2 = decodingTable[c2];
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b3 = decodingTable[c3];
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b4 = decodingTable[c4];
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out.write( (b1 << 2) | (b2 >> 4));
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out.write( (b2 << 4) | (b3 >> 2));
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out.write( (b3 << 6) | b4);
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return 3;
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}
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}
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private int nextI(String data, int i, int finish)
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{
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while ( (i < finish) && ignore(data.charAt(i)))
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{
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i++;
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}
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return i;
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}
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}
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} |