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From sand...@apache.org
Subject cvs commit: jakarta-commons-sandbox/codec/src/java/org/apache/commons/codec/base64 Base64.java
Date Thu, 24 Jan 2002 05:10:59 GMT
sanders     02/01/23 21:10:58

  Added:       codec/src/java/org/apache/commons/codec/base64 Base64.java
  Log:
  Initial Base64 Impl 1 of 16000 to choose from.  This one is from
  commons-httpclient.
  
  Revision  Changes    Path
  1.1                  jakarta-commons-sandbox/codec/src/java/org/apache/commons/codec/base64/Base64.java
  
  Index: Base64.java
  ===================================================================
  /*
   * $Header: /home/cvs/jakarta-commons-sandbox/codec/src/java/org/apache/commons/codec/base64/Base64.java,v
1.1 2002/01/24 05:10:58 sanders Exp $
   * $Revision: 1.1 $
   * $Date: 2002/01/24 05:10:58 $
   * ====================================================================
   *
   * The Apache Software License, Version 1.1
   *
   * Copyright (c) 1999-2002 The Apache Software Foundation.  All rights
   * reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   *
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in
   *    the documentation and/or other materials provided with the
   *    distribution.
   *
   * 3. The end-user documentation included with the redistribution, if
   *    any, must include the following acknowlegement:
   *       "This product includes software developed by the
   *        Apache Software Foundation (http://www.apache.org/)."
   *    Alternately, this acknowlegement may appear in the software itself,
   *    if and wherever such third-party acknowlegements normally appear.
   *
   * 4. The names "The Jakarta Project", "HttpClient", and "Apache Software
   *    Foundation" must not be used to endorse or promote products derived
   *    from this software without prior written permission. For written
   *    permission, please contact apache@apache.org.
   *
   * 5. Products derived from this software may not be called "Apache"
   *    nor may "Apache" appear in their names without prior written
   *    permission of the Apache Group.
   *
   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
   * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
   * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
   * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
   *
   * [Additional notices, if required by prior licensing conditions]
   *
   */
  
  package org.apache.commons.codec.base64;
  
  /**
   * <p>Base64 encoder and decoder.</p>
   * <p>
   * This class provides encoding/decoding methods for
   * the Base64 encoding as defined by RFC 2045,
   * N. Freed and N. Borenstein.
   * RFC 2045: Multipurpose Internet Mail Extensions (MIME)
   * Part One: Format of Internet Message Bodies. Reference
   * 1996. Available at: http://www.ietf.org/rfc/rfc2045.txt
   * </p>
   * @author Jeffrey Rodriguez
   * @version $Revision: 1.1 $ $Date: 2002/01/24 05:10:58 $
   */
  final class Base64 {
      static private final int  BASELENGTH         = 255;
      static private final int  LOOKUPLENGTH       = 64;
      static private final int  TWENTYFOURBITGROUP = 24;
      static private final int  EIGHTBIT           = 8;
      static private final int  SIXTEENBIT         = 16;
      static private final int  SIXBIT             = 6;
      static private final int  FOURBYTE           = 4;
      static private final int  SIGN               = -128;
      static private final byte PAD                = ( byte ) '=';
      static private byte [] base64Alphabet       = new byte[BASELENGTH];
      static private byte [] lookUpBase64Alphabet = new byte[LOOKUPLENGTH];
  
      static {
  
          for (int i = 0; i<BASELENGTH; i++ ) {
              base64Alphabet[i] = -1;
          }
          for ( int i = 'Z'; i >= 'A'; i-- ) {
              base64Alphabet[i] = (byte) (i-'A');
          }
          for ( int i = 'z'; i>= 'a'; i--) {
              base64Alphabet[i] = (byte) ( i-'a' + 26);
          }
  
          for ( int i = '9'; i >= '0'; i--) {
              base64Alphabet[i] = (byte) (i-'0' + 52);
          }
  
          base64Alphabet['+']  = 62;
          base64Alphabet['/']  = 63;
  
          for (int i = 0; i<=25; i++ )
              lookUpBase64Alphabet[i] = (byte) ('A'+i );
  
          for (int i = 26,  j = 0; i<=51; i++, j++ )
              lookUpBase64Alphabet[i] = (byte) ('a'+ j );
  
          for (int i = 52,  j = 0; i<=61; i++, j++ )
              lookUpBase64Alphabet[i] = (byte) ('0' + j );
          lookUpBase64Alphabet[62] = (byte) '+';
          lookUpBase64Alphabet[63] = (byte) '/';
  
      }
  
      static boolean isBase64( String isValidString ){
          return( isArrayByteBase64( isValidString.getBytes()));
      }
  
  
      static boolean isBase64( byte octect ) {
          // Should we ignore white space?
          return(octect == PAD || base64Alphabet[octect] != -1 );
      }
  
  
      static boolean isArrayByteBase64( byte[] arrayOctect ) {
          int length = arrayOctect.length;
          if ( length == 0 ) {
              return true;
          }
          for ( int i=0; i < length; i++ ) {
              if ( Base64.isBase64( arrayOctect[i] ) == false)
                  return false;
          }
          return true;
      }
  
      /**
       * Encodes hex octects into Base64
       *
       * @param binaryData Array containing binaryData
       * @return Base64-encoded array
       */
      static byte[] encode( byte[] binaryData ) {
  
          int      lengthDataBits    = binaryData.length*EIGHTBIT;
          int      fewerThan24bits   = lengthDataBits%TWENTYFOURBITGROUP;
          int      numberTriplets    = lengthDataBits/TWENTYFOURBITGROUP;
          byte     encodedData[]     = null;
  
  
          if ( fewerThan24bits != 0 ) //data not divisible by 24 bit
              encodedData = new byte[ (numberTriplets + 1 )*4  ];
          else // 16 or 8 bit
              encodedData = new byte[ numberTriplets*4 ];
  
          byte k=0, l=0, b1=0,b2=0,b3=0;
  
          int encodedIndex = 0;
          int dataIndex   = 0;
          int i           = 0;
          for ( i = 0; i<numberTriplets; i++ ) {
  
              dataIndex = i*3;
              b1 = binaryData[dataIndex];
              b2 = binaryData[dataIndex + 1];
              b3 = binaryData[dataIndex + 2];
  
              l  = (byte)(b2 & 0x0f);
              k  = (byte)(b1 & 0x03);
  
              encodedIndex = i*4;
              byte val1 = ((b1 & SIGN)==0)?(byte)(b1>>2):(byte)((b1)>>2^0xc0);
  
              byte val2 = ((b2 & SIGN)==0)?(byte)(b2>>4):(byte)((b2)>>4^0xf0);
              byte val3 = ((b3 & SIGN)==0)?(byte)(b3>>6):(byte)((b3)>>6^0xfc);
  
              encodedData[encodedIndex]   = lookUpBase64Alphabet[ val1 ];
              encodedData[encodedIndex+1] = lookUpBase64Alphabet[ val2 | ( k<<4 )];
              encodedData[encodedIndex+2] = lookUpBase64Alphabet[ (l <<2 ) | val3 ];
              encodedData[encodedIndex+3] = lookUpBase64Alphabet[ b3 & 0x3f ];
          }
  
          // form integral number of 6-bit groups
          dataIndex    = i*3;
          encodedIndex = i*4;
          if (fewerThan24bits == EIGHTBIT ) {
              b1 = binaryData[dataIndex];
              k = (byte) ( b1 &0x03 );
              byte val1 = ((b1 & SIGN)==0)?(byte)(b1>>2):(byte)((b1)>>2^0xc0);
              encodedData[encodedIndex]     = lookUpBase64Alphabet[ val1 ];
              encodedData[encodedIndex + 1] = lookUpBase64Alphabet[ k<<4 ];
              encodedData[encodedIndex + 2] = PAD;
              encodedData[encodedIndex + 3] = PAD;
          } else if ( fewerThan24bits == SIXTEENBIT ) {
              b1 = binaryData[dataIndex];
              b2 = binaryData[dataIndex +1 ];
              l = ( byte ) ( b2 &0x0f );
              k = ( byte ) ( b1 &0x03 );
  
              byte val1 = ((b1 & SIGN)==0)?(byte)(b1>>2):(byte)((b1)>>2^0xc0);
              byte val2 = ((b2 & SIGN)==0)?(byte)(b2>>4):(byte)((b2)>>4^0xf0);
  
              encodedData[encodedIndex]     = lookUpBase64Alphabet[ val1 ];
              encodedData[encodedIndex + 1] = lookUpBase64Alphabet[ val2 | ( k<<4 )];
              encodedData[encodedIndex + 2] = lookUpBase64Alphabet[ l<<2 ];
              encodedData[encodedIndex + 3] = PAD;
          }
          return encodedData;
      }
  
  
      /**
       * Decodes Base64 data into octects
       *
       * @param binaryData Byte array containing Base64 data
       * @return Array containing decoded data.
       */
      static byte[] decode( byte[] base64Data ) {
          // Should we throw away anything not in base64Data ?
  
          // handle the edge case, so we don't have to worry about it later
          if(base64Data.length == 0) { return new byte[0]; }
  
          int      numberQuadruple    = base64Data.length/FOURBYTE;
          byte     decodedData[]      = null;
          byte     b1=0,b2=0,b3=0, b4=0, marker0=0, marker1=0;
  
          int encodedIndex = 0;
          int dataIndex    = 0;
          {
              // this block sizes the output array properly - rlw
              int lastData = base64Data.length;
              // ignore the '=' padding
              while(base64Data[lastData-1] == PAD) {
                  if(--lastData == 0) { return new byte[0]; }
              }
              decodedData = new byte[ lastData - numberQuadruple ];
          }
  
          for (int i = 0; i<numberQuadruple; i++ ) {
              dataIndex = i*4;
              marker0   = base64Data[dataIndex +2];
              marker1   = base64Data[dataIndex +3];
  
              b1 = base64Alphabet[base64Data[dataIndex]];
              b2 = base64Alphabet[base64Data[dataIndex +1]];
  
              if ( marker0 != PAD && marker1 != PAD ) {     //No PAD e.g 3cQl
                  b3 = base64Alphabet[ marker0 ];
                  b4 = base64Alphabet[ marker1 ];
  
                  decodedData[encodedIndex]   = (byte)(  b1 <<2 | b2>>4 ) ;
                  decodedData[encodedIndex+1] = (byte)(((b2 & 0xf)<<4 ) |( (b3>>2)
& 0xf) );
                  decodedData[encodedIndex+2] = (byte)( b3<<6 | b4 );
              } else if ( marker0 == PAD ) {               //Two PAD e.g. 3c[Pad][Pad]
                  decodedData[encodedIndex]   = (byte)(  b1 <<2 | b2>>4 ) ;
              } else if ( marker1 == PAD ) {              //One PAD e.g. 3cQ[Pad]
                  b3 = base64Alphabet[ marker0 ];
  
                  decodedData[encodedIndex]   = (byte)(  b1 <<2 | b2>>4 );
                  decodedData[encodedIndex+1] = (byte)(((b2 & 0xf)<<4 ) |( (b3>>2)
& 0xf) );
              }
              encodedIndex += 3;
          }
          return decodedData;
      }
  
  }
  
  
  

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