content: /* ========================================================================
   * JCommon : a free general purpose class library for the Java(tm) platform
   * ========================================================================
   *
   * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
   * 
   * Project Info:  http://www.jfree.org/jcommon/index.html
   *
   * This library is free software; you can redistribute it and/or modify it 
   * under the terms of the GNU Lesser General Public License as published by 
   * the Free Software Foundation; either version 2.1 of the License, or 
   * (at your option) any later version.
   *
   * This library 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 Lesser General Public 
   * License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with this library; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, 
   * USA.  
   *
   * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 
   * in the United States and other countries.]
   * 
   * -------------------------------------
   * AbstractElementDefinitionHandler.java
   * -------------------------------------
   * (C)opyright 2003-2005, by Thomas Morgner and Contributors.
   *
   * Original Author:  Kevin Kelley <kelley@ruralnet.net> -
   *                   30718 Rd. 28, La Junta, CO, 81050  USA. 
   *
   * $Id: Base64.java,v 1.4 2005/10/18 13:33:53 mungady Exp $
   *
   * Changes
   * -------------------------
   * 23.09.2003 : Initial version
   *
   */
  package org.jfree.xml.util;
  
  import java.io.BufferedInputStream;
  import java.io.BufferedOutputStream;
  import java.io.BufferedReader;
  import java.io.BufferedWriter;
  import java.io.ByteArrayOutputStream;
  import java.io.CharArrayWriter;
  import java.io.File;
  import java.io.FileInputStream;
  import java.io.FileOutputStream;
  import java.io.FileReader;
  import java.io.FileWriter;
  import java.io.InputStream;
  import java.io.OutputStream;
  import java.io.Reader;
  import java.io.Writer;
  
  /**
   * Provides encoding of raw bytes to base64-encoded characters, and
   * decoding of base64 characters to raw bytes.
   * date: 06 August 1998
   * modified: 14 February 2000
   * modified: 22 September 2000
   *
   * @author Kevin Kelley (kelley@ruralnet.net)
   * @version 1.3
   */
  public class Base64 {
  
    private Base64 ()
    {
    }
  
      /**
       * returns an array of base64-encoded characters to represent the
       * passed data array.
       *
       * @param data the array of bytes to encode
       * @return base64-coded character array.
       */
      public static char[] encode(final byte[] data) {
          final char[] out = new char[((data.length + 2) / 3) * 4];
  
          //
          // 3 bytes encode to 4 chars.  Output is always an even
          // multiple of 4 characters.
          //
          for (int i = 0, index = 0; i < data.length; i += 3, index += 4) {
              boolean quad = false;
              boolean trip = false;
  
              int val = (0xFF & data[i]);
              val <<= 8;
              if ((i + 1) < data.length) {
                  val |= (0xFF & data[i + 1]);
                  trip = true;
              }
              val <<= 8;
              if ((i + 2) < data.length) {
                  val |= (0xFF & data[i + 2]);
                  quad = true;
              }
              out[index + 3] = alphabet[(quad ? (val & 0x3F) : 64)];
              val >>= 6;
              out[index + 2] = alphabet[(trip ? (val & 0x3F) : 64)];
              val >>= 6;
              out[index + 1] = alphabet[val & 0x3F];
              val >>= 6;
              out[index + 0] = alphabet[val & 0x3F];
          }
          return out;
      }
  
      /**
       * Decodes a BASE-64 encoded stream to recover the original
       * data. White space before and after will be trimmed away,
       * but no other manipulation of the input will be performed.
       *
       * As of version 1.2 this method will properly handle input
       * containing junk characters (newlines and the like) rather
       * than throwing an error. It does this by pre-parsing the
       * input and generating from that a count of VALID input
       * characters.
       * 
       * @param data  the character data.
       * 
       * @return The decoded data.
       */
      public static byte[] decode(final char[] data) {
          // as our input could contain non-BASE64 data (newlines,
          // whitespace of any sort, whatever) we must first adjust
          // our count of USABLE data so that...
          // (a) we don't misallocate the output array, and
          // (b) think that we miscalculated our data length
          //     just because of extraneous throw-away junk
  
          int tempLen = data.length;
          for (int ix = 0; ix < data.length; ix++) {
              if ((data[ix] > 255) || codes[data[ix]] < 0) {
                  --tempLen; // ignore non-valid chars and padding
              }
          }
          // calculate required length:
          //  -- 3 bytes for every 4 valid base64 chars
          //  -- plus 2 bytes if there are 3 extra base64 chars,
          //     or plus 1 byte if there are 2 extra.
  
          int len = (tempLen / 4) * 3;
          if ((tempLen % 4) == 3) {
              len += 2;
          }
          if ((tempLen % 4) == 2) {
              len += 1;
          }
  
          final byte[] out = new byte[len];
  
  
          int shift = 0; // # of excess bits stored in accum
          int accum = 0; // excess bits
          int index = 0;
  
          // we now go through the entire array (NOT using the 'tempLen' value)
          for (int ix = 0; ix < data.length; ix++) {
              final int value = (data[ix] > 255) ? -1 : codes[data[ix]];
  
              if (value >= 0) { // skip over non-code
                  accum <<= 6; // bits shift up by 6 each time thru
                  shift += 6; // loop, with new bits being put in
                  accum |= value; // at the bottom.
                  if (shift >= 8) { // whenever there are 8 or more shifted in,
                      shift -= 8; // write them out (from the top, leaving any
                      out[index++] = // excess at the bottom for next iteration.
                          (byte) ((accum >> shift) & 0xff);
                  }
              }
              // we will also have skipped processing a padding null byte ('=') here;
              // these are used ONLY for padding to an even length and do not legally
              // occur as encoded data. for this reason we can ignore the fact that
              // no index++ operation occurs in that special case: the out[] array is
              // initialized to all-zero bytes to start with and that works to our
              // advantage in this combination.
          }
  
          // if there is STILL something wrong we just have to throw up now!
          if (index != out.length) {
              throw new Error("Miscalculated data length (wrote " 
                  + index + " instead of " + out.length + ")");
          }
  
          return out;
      }
  
  
      //
      // code characters for values 0..63
      //
      private static char[] alphabet =
          "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=".toCharArray();
  
      //
      // lookup table for converting base64 characters to value in range 0..63
      //
      private static byte[] codes = new byte[256];
  
      static {
          for (int i = 0; i < 256; i++) {
              codes[i] = -1;
          }
          for (int i = 'A'; i <= 'Z'; i++) {
              codes[i] = (byte) (i - 'A');
          }
          for (int i = 'a'; i <= 'z'; i++) {
              codes[i] = (byte) (26 + i - 'a');
          }
          for (int i = '0'; i <= '9'; i++) {
              codes[i] = (byte) (52 + i - '0');
          }
          codes['+'] = 62;
          codes['/'] = 63;
      }
  
  
  
  
      ///////////////////////////////////////////////////
      // remainder (main method and helper functions) is
      // for testing purposes only, feel free to clip it.
      ///////////////////////////////////////////////////
  
      /**
       * Entry point.
       * 
       * @param args  the command line arguments.
       */
      public static void main(final String[] args) {
          boolean decode = false;
  
          if (args.length == 0) {
              System.out.println("usage:  java Base64 [-d[ecode]] filename");
              System.exit(0);
          }
          for (int i = 0; i < args.length; i++) {
              if ("-decode".equalsIgnoreCase(args[i])) {
                  decode = true;
              }
              else if ("-d".equalsIgnoreCase(args[i])) {
                  decode = true;
              }   
          }
  
          final String filename = args[args.length - 1];
          final File file = new File(filename);
          if (!file.exists()) {
              System.out.println("Error:  file '" + filename + "' doesn't exist!");
              System.exit(0);
          }
  
          if (decode) {
              final char[] encoded = readChars(file);
              final byte[] decoded = decode(encoded);
              writeBytes(file, decoded);
          }
          else {
              final byte[] decoded = readBytes(file);
              final char[] encoded = encode(decoded);
              writeChars(file, encoded);
          }
      }
  
      private static byte[] readBytes(final File file) {
          final ByteArrayOutputStream baos = new ByteArrayOutputStream();
          try {
              final InputStream fis = new FileInputStream(file);
              final InputStream is = new BufferedInputStream(fis);
  
              int count;
              final byte[] buf = new byte[16384];
              while ((count = is.read(buf)) != -1) {
                  if (count > 0) {
                      baos.write(buf, 0, count);
                  }   
              }
              is.close();
          }
          catch (Exception e) {
              e.printStackTrace();
          }
  
          return baos.toByteArray();
      }
  
      private static char[] readChars(final File file) {
          final CharArrayWriter caw = new CharArrayWriter();
          try {
              final Reader fr = new FileReader(file);
              final Reader in = new BufferedReader(fr);
              int count;
              final char[] buf = new char[16384];
              while ((count = in.read(buf)) != -1) {
                  if (count > 0) {
                      caw.write(buf, 0, count);
                  }
              }
              in.close();
          }
          catch (Exception e) {
              e.printStackTrace();
          }
  
          return caw.toCharArray();
      }
  
      private static void writeBytes(final File file, final byte[] data) {
          try {
              final OutputStream fos = new FileOutputStream(file);
              final OutputStream os = new BufferedOutputStream(fos);
              os.write(data);
              os.close();
          }
          catch (Exception e) {
              e.printStackTrace();
          }
      }
  
      private static void writeChars(final File file, final char[] data) {
          try {
              final Writer fos = new FileWriter(file);
              final Writer os = new BufferedWriter(fos);
              os.write(data);
              os.close();
          }
          catch (Exception e) {
              e.printStackTrace();
          }
      }
      ///////////////////////////////////////////////////
      // end of test code.
      ///////////////////////////////////////////////////
  
  }
  