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/*
* BASE64.java
* Copyright (C) 2003 The Free Software Foundation
*
* This file is part of GNU inetlib, a library.
*
* GNU inetlib is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* GNU inetlib is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Linking this library statically or dynamically with other modules is
* making a combined work based on this library. Thus, the terms and
* conditions of the GNU General Public License cover the whole
* combination.
*
* As a special exception, the copyright holders of this library give you
* permission to link this library with independent modules to produce an
* executable, regardless of the license terms of these independent
* modules, and to copy and distribute the resulting executable under
* terms of your choice, provided that you also meet, for each linked
* independent module, the terms and conditions of the license of that
* module. An independent module is a module which is not derived from
* or based on this library. If you modify this library, you may extend
* this exception to your version of the library, but you are not
* obliged to do so. If you do not wish to do so, delete this
* exception statement from your version.
*/
package gnu.inet.util;
/**
* Encodes and decodes text according to the BASE64 encoding.
*
* @author <a href="mailto:dog@gnu.org">Chris Burdess</a>
*/
public final class BASE64
{
private static final byte[] src = {
0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4a,
0x4b, 0x4c, 0x4d, 0x4e, 0x4f, 0x50, 0x51, 0x52, 0x53, 0x54,
0x55, 0x56, 0x57, 0x58, 0x59, 0x5a, 0x61, 0x62, 0x63, 0x64,
0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e,
0x6f, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78,
0x79, 0x7a, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
0x38, 0x39, 0x2b, 0x2f
};
private static final byte[] dst;
static
{
dst = new byte[0x100];
for (int i = 0x0; i < 0xff; i++)
{
dst[i] = -1;
}
for (int i = 0; i < src.length; i++)
{
dst[src[i]] = (byte) i;
}
}
private BASE64()
{
}
/**
* Encode the specified byte array using the BASE64 algorithm.
*
* @param bs the source byte array
*/
public static byte[] encode(byte[] bs)
{
int si = 0, ti = 0; // source/target array indices
byte[] bt = new byte[((bs.length + 2) * 4) / 3]; // target byte array
for (; si < bs.length; si += 3)
{
int buflen = bs.length - si;
if (buflen == 1)
{
byte b = bs[si];
int i = 0;
boolean flag = false;
bt[ti++] = src[b >>> 2 & 0x3f];
bt[ti++] = src[(b << 4 & 0x30) + (i >>> 4 & 0xf)];
}
else if (buflen == 2)
{
byte b1 = bs[si], b2 = bs[si + 1];
int i = 0;
bt[ti++] = src[b1 >>> 2 & 0x3f];
bt[ti++] = src[(b1 << 4 & 0x30) + (b2 >>> 4 & 0xf)];
bt[ti++] = src[(b2 << 2 & 0x3c) + (i >>> 6 & 0x3)];
}
else
{
byte b1 = bs[si], b2 = bs[si + 1], b3 = bs[si + 2];
bt[ti++] = src[b1 >>> 2 & 0x3f];
bt[ti++] = src[(b1 << 4 & 0x30) + (b2 >>> 4 & 0xf)];
bt[ti++] = src[(b2 << 2 & 0x3c) + (b3 >>> 6 & 0x3)];
bt[ti++] = src[b3 & 0x3f];
}
}
if (ti < bt.length)
{
byte[] tmp = new byte[ti];
System.arraycopy(bt, 0, tmp, 0, ti);
bt = tmp;
}
/*while (ti < bt.length)
{
bt[ti++] = 0x3d;
}*/
return bt;
}
/**
* Decode the specified byte array using the BASE64 algorithm.
*
* @param bs the source byte array
*/
public static byte[] decode(byte[] bs)
{
int srclen = bs.length;
while (srclen > 0 && bs[srclen - 1] == 0x3d)
{
srclen--; /* strip padding character */
}
byte[] buffer = new byte[srclen];
int buflen = 0;
int si = 0;
int len = srclen - si;
while (len > 0)
{
byte b0 = dst[bs[si++] & 0xff];
byte b2 = dst[bs[si++] & 0xff];
buffer[buflen++] = (byte) (b0 << 2 & 0xfc | b2 >>> 4 & 0x3);
if (len > 2)
{
b0 = b2;
b2 = dst[bs[si++] & 0xff];
buffer[buflen++] = (byte) (b0 << 4 & 0xf0 | b2 >>> 2 & 0xf);
if (len > 3)
{
b0 = b2;
b2 = dst[bs[si++] & 0xff];
buffer[buflen++] = (byte) (b0 << 6 & 0xc0 | b2 & 0x3f);
}
}
len = srclen - si;
}
byte[] bt = new byte[buflen];
System.arraycopy(buffer, 0, bt, 0, buflen);
return bt;
}
public static void main(String[] args)
{
boolean decode = false;
for (int i = 0; i < args.length; i++)
{
if (args[i].equals("-d"))
{
decode = true;
}
else
{
try
{
byte[] in = args[i].getBytes("US-ASCII");
byte[] out = decode ? decode(in) : encode(in);
System.out.println(args[i] + " = " +
new String(out, "US-ASCII"));
}
catch (java.io.UnsupportedEncodingException e)
{
e.printStackTrace(System.err);
}
}
}
}
}
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