Moved here from helma.xmlrpc, which has gone. Needed by helma.framework.RequestTrans.
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286
src/helma/util/Base64.java
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286
src/helma/util/Base64.java
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//////////////////////license & copyright header/////////////////////////
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// //
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// Base64 - encode/decode data using the Base64 encoding scheme //
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// //
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// Copyright (c) 1998 by Kevin Kelley //
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// //
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// This library is free software; you can redistribute it and/or //
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// modify it under the terms of the GNU Lesser General Public //
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// License as published by the Free Software Foundation; either //
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// version 2.1 of the License, or (at your option) any later version. //
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// //
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// This library is distributed in the hope that it will be useful, //
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// but WITHOUT ANY WARRANTY; without even the implied warranty of //
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
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// GNU Lesser General Public License for more details. //
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// //
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// You should have received a copy of the GNU Lesser General Public //
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// License along with this library; if not, write to the Free Software //
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// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA //
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// 02111-1307, USA, or contact the author: //
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// //
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// Kevin Kelley <kelley@ruralnet.net> - 30718 Rd. 28, La Junta, CO, //
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// 81050 USA. //
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// //
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////////////////////end license & copyright header///////////////////////
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package helma.util;
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import java.io.*; // needed only for main() method.
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/**
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* Provides encoding of raw bytes to base64-encoded characters, and
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* decoding of base64 characters to raw bytes.
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*
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* @author Kevin Kelley (kelley@ruralnet.net)
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* @version 1.3
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* @date 06 August 1998
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* @modified 14 February 2000
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* @modified 22 September 2000
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*/
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public class Base64 {
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/**
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* returns an array of base64-encoded characters to represent the
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* passed data array.
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*
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* @param data the array of bytes to encode
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* @return base64-coded character array.
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*/
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static public char[] encode(byte[] data)
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{
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char[] out = new char[((data.length + 2) / 3) * 4];
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//
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// 3 bytes encode to 4 chars. Output is always an even
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// multiple of 4 characters.
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//
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for (int i=0, index=0; i<data.length; i+=3, index+=4) {
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boolean quad = false;
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boolean trip = false;
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int val = (0xFF & (int) data[i]);
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val <<= 8;
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if ((i+1) < data.length) {
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val |= (0xFF & (int) data[i+1]);
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trip = true;
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}
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val <<= 8;
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if ((i+2) < data.length) {
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val |= (0xFF & (int) data[i+2]);
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quad = true;
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}
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out[index+3] = alphabet[(quad? (val & 0x3F): 64)];
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val >>= 6;
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out[index+2] = alphabet[(trip? (val & 0x3F): 64)];
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val >>= 6;
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out[index+1] = alphabet[val & 0x3F];
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val >>= 6;
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out[index+0] = alphabet[val & 0x3F];
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}
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return out;
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}
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/**
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* Decodes a BASE-64 encoded stream to recover the original
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* data. White space before and after will be trimmed away,
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* but no other manipulation of the input will be performed.
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*
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* As of version 1.2 this method will properly handle input
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* containing junk characters (newlines and the like) rather
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* than throwing an error. It does this by pre-parsing the
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* input and generating from that a count of VALID input
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* characters.
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**/
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static public byte[] decode(char[] data)
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{
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// as our input could contain non-BASE64 data (newlines,
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// whitespace of any sort, whatever) we must first adjust
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// our count of USABLE data so that...
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// (a) we don't misallocate the output array, and
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// (b) think that we miscalculated our data length
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// just because of extraneous throw-away junk
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int tempLen = data.length;
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for( int ix=0; ix<data.length; ix++ )
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{
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if( (data[ix] > 255) || codes[ data[ix] ] < 0 )
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--tempLen; // ignore non-valid chars and padding
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}
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// calculate required length:
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// -- 3 bytes for every 4 valid base64 chars
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// -- plus 2 bytes if there are 3 extra base64 chars,
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// or plus 1 byte if there are 2 extra.
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int len = (tempLen / 4) * 3;
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if ((tempLen % 4) == 3) len += 2;
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if ((tempLen % 4) == 2) len += 1;
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byte[] out = new byte[len];
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int shift = 0; // # of excess bits stored in accum
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int accum = 0; // excess bits
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int index = 0;
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// we now go through the entire array (NOT using the 'tempLen' value)
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for (int ix=0; ix<data.length; ix++)
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{
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int value = (data[ix]>255)? -1: codes[ data[ix] ];
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if ( value >= 0 ) // skip over non-code
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{
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accum <<= 6; // bits shift up by 6 each time thru
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shift += 6; // loop, with new bits being put in
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accum |= value; // at the bottom.
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if ( shift >= 8 ) // whenever there are 8 or more shifted in,
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{
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shift -= 8; // write them out (from the top, leaving any
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out[index++] = // excess at the bottom for next iteration.
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(byte) ((accum >> shift) & 0xff);
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}
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}
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// we will also have skipped processing a padding null byte ('=') here;
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// these are used ONLY for padding to an even length and do not legally
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// occur as encoded data. for this reason we can ignore the fact that
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// no index++ operation occurs in that special case: the out[] array is
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// initialized to all-zero bytes to start with and that works to our
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// advantage in this combination.
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}
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// if there is STILL something wrong we just have to throw up now!
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if( index != out.length)
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{
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throw new Error("Miscalculated data length (wrote " + index + " instead of " + out.length + ")");
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}
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return out;
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}
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//
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// code characters for values 0..63
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//
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static private char[] alphabet =
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"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/="
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.toCharArray();
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//
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// lookup table for converting base64 characters to value in range 0..63
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//
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static private byte[] codes = new byte[256];
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static {
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for (int i=0; i<256; i++) codes[i] = -1;
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for (int i = 'A'; i <= 'Z'; i++) codes[i] = (byte)( i - 'A');
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for (int i = 'a'; i <= 'z'; i++) codes[i] = (byte)(26 + i - 'a');
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for (int i = '0'; i <= '9'; i++) codes[i] = (byte)(52 + i - '0');
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codes['+'] = 62;
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codes['/'] = 63;
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}
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///////////////////////////////////////////////////
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// remainder (main method and helper functions) is
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// for testing purposes only, feel free to clip it.
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///////////////////////////////////////////////////
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public static void main(String[] args)
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{
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boolean decode = false;
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if (args.length == 0) {
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System.out.println("usage: java Base64 [-d[ecode]] filename");
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System.exit(0);
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}
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for (int i=0; i<args.length; i++) {
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if ("-decode".equalsIgnoreCase(args[i])) decode = true;
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else if ("-d".equalsIgnoreCase(args[i])) decode = true;
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}
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String filename = args[args.length-1];
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File file = new File(filename);
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if (!file.exists()) {
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System.out.println("Error: file '" + filename + "' doesn't exist!");
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System.exit(0);
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}
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if (decode)
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{
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char[] encoded = readChars(file);
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byte[] decoded = decode(encoded);
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writeBytes(file, decoded);
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}
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else
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{
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byte[] decoded = readBytes(file);
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char[] encoded = encode(decoded);
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writeChars(file, encoded);
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}
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}
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private static byte[] readBytes(File file)
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{
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ByteArrayOutputStream baos = new ByteArrayOutputStream();
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try
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{
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InputStream fis = new FileInputStream(file);
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InputStream is = new BufferedInputStream(fis);
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int count = 0;
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byte[] buf = new byte[16384];
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while ((count=is.read(buf)) != -1) {
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if (count > 0) baos.write(buf, 0, count);
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}
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is.close();
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}
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catch (Exception e) { e.printStackTrace(); }
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return baos.toByteArray();
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}
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private static char[] readChars(File file)
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{
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CharArrayWriter caw = new CharArrayWriter();
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try
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{
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Reader fr = new FileReader(file);
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Reader in = new BufferedReader(fr);
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int count = 0;
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char[] buf = new char[16384];
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while ((count=in.read(buf)) != -1) {
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if (count > 0) caw.write(buf, 0, count);
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}
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in.close();
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}
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catch (Exception e) { e.printStackTrace(); }
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return caw.toCharArray();
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}
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private static void writeBytes(File file, byte[] data) {
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try {
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OutputStream fos = new FileOutputStream(file);
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OutputStream os = new BufferedOutputStream(fos);
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os.write(data);
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os.close();
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}
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catch (Exception e) { e.printStackTrace(); }
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}
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private static void writeChars(File file, char[] data) {
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try {
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Writer fos = new FileWriter(file);
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Writer os = new BufferedWriter(fos);
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os.write(data);
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os.close();
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}
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catch (Exception e) { e.printStackTrace(); }
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}
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///////////////////////////////////////////////////
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// end of test code.
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///////////////////////////////////////////////////
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}
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