| /* BASE.java -- |
| Copyright (C) 2003, 2004 Free Software Foundation, Inc. |
| |
| This file is part of GNU Classpath. |
| |
| GNU Classpath 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, or (at your option) |
| any later version. |
| |
| GNU Classpath 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 GNU Classpath; see the file COPYING. 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 |
| obligated to do so. If you do not wish to do so, delete this |
| exception statement from your version. */ |
| |
| |
| package gnu.java.net; |
| |
| /** |
| * Encodes and decodes text according to the BASE64 encoding. |
| * |
| * @author Chris Burdess (dog@gnu.org) |
| */ |
| 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; |
| 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]; |
| } |
| } |
| /*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); |
| } |
| } |
| } |
| } |
| } |