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