gt:                 destination[destOffset + 1] = alphabet[(inBuff >>> 12) & 0x3f];
context: // Portions copyright 2002, Google, Inc.
  //
  // Licensed under the Apache License, Version 2.0 (the "License");
  // you may not use this file except in compliance with the License.
  // You may obtain a copy of the License at
  //
  //     http://www.apache.org/licenses/LICENSE-2.0
  //
  // Unless required by applicable law or agreed to in writing, software
  // distributed under the License is distributed on an "AS IS" BASIS,
  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  // See the License for the specific language governing permissions and
  // limitations under the License.
  
  package com.fast.access.kam.global.util;
  
  // This code was converted from code at http://iharder.sourceforge.net/base64/
  // Lots of extraneous features were removed.
  /* The original code said:
   * <p>
   * I am placing this code in the Public Domain. Do with it as you will.
   * This software comes with no guarantees or warranties but with
   * plenty of well-wishing instead!
   * Please visit
   * <a href="http://iharder.net/xmlizable">http://iharder.net/xmlizable</a>
   * periodically to check for updates or to contribute improvements.
   * </p>
   *
   * @author Robert Harder
   * @author rharder@usa.net
   * @version 1.3
   */
  
  /**
   * Base64 converter class. This code is not a complete MIME encoder;
   * it simply converts binary data to base64 data and back.
   *
   * <p>Note {@link CharBase64} is a GWT-compatible implementation of this
   * class.
   */
  public class Base64 {
      /** Specify encoding (value is {@code true}). */
      public final static boolean ENCODE = true;
  
      /** Specify decoding (value is {@code false}). */
      public final static boolean DECODE = false;
  
      /** The equals sign (=) as a byte. */
      private final static byte EQUALS_SIGN = (byte) '=';
  
      /** The new line character (\n) as a byte. */
      private final static byte NEW_LINE = (byte) '\n';
  
      /**
       * The 64 valid Base64 values.
       */
      private final static byte[] ALPHABET =
          {(byte) 'A', (byte) 'B', (byte) 'C', (byte) 'D', (byte) 'E', (byte) 'F',
          (byte) 'G', (byte) 'H', (byte) 'I', (byte) 'J', (byte) 'K',
          (byte) 'L', (byte) 'M', (byte) 'N', (byte) 'O', (byte) 'P',
          (byte) 'Q', (byte) 'R', (byte) 'S', (byte) 'T', (byte) 'U',
          (byte) 'V', (byte) 'W', (byte) 'X', (byte) 'Y', (byte) 'Z',
          (byte) 'a', (byte) 'b', (byte) 'c', (byte) 'd', (byte) 'e',
          (byte) 'f', (byte) 'g', (byte) 'h', (byte) 'i', (byte) 'j',
          (byte) 'k', (byte) 'l', (byte) 'm', (byte) 'n', (byte) 'o',
          (byte) 'p', (byte) 'q', (byte) 'r', (byte) 's', (byte) 't',
          (byte) 'u', (byte) 'v', (byte) 'w', (byte) 'x', (byte) 'y',
          (byte) 'z', (byte) '0', (byte) '1', (byte) '2', (byte) '3',
          (byte) '4', (byte) '5', (byte) '6', (byte) '7', (byte) '8',
          (byte) '9', (byte) '+', (byte) '/'};
  
      /**
       * The 64 valid web safe Base64 values.
       */
      private final static byte[] WEBSAFE_ALPHABET =
          {(byte) 'A', (byte) 'B', (byte) 'C', (byte) 'D', (byte) 'E', (byte) 'F',
          (byte) 'G', (byte) 'H', (byte) 'I', (byte) 'J', (byte) 'K',
          (byte) 'L', (byte) 'M', (byte) 'N', (byte) 'O', (byte) 'P',
          (byte) 'Q', (byte) 'R', (byte) 'S', (byte) 'T', (byte) 'U',
          (byte) 'V', (byte) 'W', (byte) 'X', (byte) 'Y', (byte) 'Z',
          (byte) 'a', (byte) 'b', (byte) 'c', (byte) 'd', (byte) 'e',
          (byte) 'f', (byte) 'g', (byte) 'h', (byte) 'i', (byte) 'j',
          (byte) 'k', (byte) 'l', (byte) 'm', (byte) 'n', (byte) 'o',
          (byte) 'p', (byte) 'q', (byte) 'r', (byte) 's', (byte) 't',
          (byte) 'u', (byte) 'v', (byte) 'w', (byte) 'x', (byte) 'y',
          (byte) 'z', (byte) '0', (byte) '1', (byte) '2', (byte) '3',
          (byte) '4', (byte) '5', (byte) '6', (byte) '7', (byte) '8',
          (byte) '9', (byte) '-', (byte) '_'};
  
      /**
       * Translates a Base64 value to either its 6-bit reconstruction value
       * or a negative number indicating some other meaning.
       **/
      private final static byte[] DECODABET = {-9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal  0 -  8
          -5, -5, // Whitespace: Tab and Linefeed
          -9, -9, // Decimal 11 - 12
          -5, // Whitespace: Carriage Return
          -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 14 - 26
          -9, -9, -9, -9, -9, // Decimal 27 - 31
          -5, // Whitespace: Space
          -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 33 - 42
          62, // Plus sign at decimal 43
          -9, -9, -9, // Decimal 44 - 46
          63, // Slash at decimal 47
          52, 53, 54, 55, 56, 57, 58, 59, 60, 61, // Numbers zero through nine
          -9, -9, -9, // Decimal 58 - 60
          -1, // Equals sign at decimal 61
          -9, -9, -9, // Decimal 62 - 64
          0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, // Letters 'A' through 'N'
          14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, // Letters 'O' through 'Z'
          -9, -9, -9, -9, -9, -9, // Decimal 91 - 96
          26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, // Letters 'a' through 'm'
          39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, // Letters 'n' through 'z'
          -9, -9, -9, -9, -9 // Decimal 123 - 127
          /*  ,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 128 - 139
          -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 140 - 152
          -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 153 - 165
          -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 166 - 178
          -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 179 - 191
          -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 192 - 204
          -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 205 - 217
          -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 218 - 230
          -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 231 - 243
          -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9         // Decimal 244 - 255 */
      };
  
      /** The web safe decodabet */
      private final static byte[] WEBSAFE_DECODABET =
          {-9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal  0 -  8
          -5, -5, // Whitespace: Tab and Linefeed
          -9, -9, // Decimal 11 - 12
          -5, // Whitespace: Carriage Return
          -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 14 - 26
          -9, -9, -9, -9, -9, // Decimal 27 - 31
          -5, // Whitespace: Space
          -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 33 - 44
          62, // Dash '-' sign at decimal 45
          -9, -9, // Decimal 46-47
          52, 53, 54, 55, 56, 57, 58, 59, 60, 61, // Numbers zero through nine
          -9, -9, -9, // Decimal 58 - 60
          -1, // Equals sign at decimal 61
          -9, -9, -9, // Decimal 62 - 64
          0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, // Letters 'A' through 'N'
          14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, // Letters 'O' through 'Z'
          -9, -9, -9, -9, // Decimal 91-94
          63, // Underscore '_' at decimal 95
          -9, // Decimal 96
          26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, // Letters 'a' through 'm'
          39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, // Letters 'n' through 'z'
          -9, -9, -9, -9, -9 // Decimal 123 - 127
          /*  ,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 128 - 139
          -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 140 - 152
          -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 153 - 165
          -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 166 - 178
          -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 179 - 191
          -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 192 - 204
          -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 205 - 217
          -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 218 - 230
          -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 231 - 243
          -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9         // Decimal 244 - 255 */
          };
  
      // Indicates white space in encoding
      private final static byte WHITE_SPACE_ENC = -5;
      // Indicates equals sign in encoding
      private final static byte EQUALS_SIGN_ENC = -1;
  
      /** Defeats instantiation. */
      private Base64() {
      }
  
      /* ********  E N C O D I N G   M E T H O D S  ******** */
  
      /**
       * Encodes up to three bytes of the array <var>source</var>
       * and writes the resulting four Base64 bytes to <var>destination</var>.
       * The source and destination arrays can be manipulated
       * anywhere along their length by specifying
       * <var>srcOffset</var> and <var>destOffset</var>.
       * This method does not check to make sure your arrays
       * are large enough to accommodate <var>srcOffset</var> + 3 for
       * the <var>source</var> array or <var>destOffset</var> + 4 for
       * the <var>destination</var> array.
       * The actual number of significant bytes in your array is
       * given by <var>numSigBytes</var>.
       *
       * @param source the array to convert
       * @param srcOffset the index where conversion begins
       * @param numSigBytes the number of significant bytes in your array
       * @param destination the array to hold the conversion
       * @param destOffset the index where output will be put
       * @param alphabet is the encoding alphabet
       * @return the <var>destination</var> array
       * @since 1.3
       */
      private static byte[] encode3to4(byte[] source, int srcOffset,
              int numSigBytes, byte[] destination, int destOffset, byte[] alphabet) {
          //           1         2         3
          // 01234567890123456789012345678901 Bit position
          // --------000000001111111122222222 Array position from threeBytes
          // --------|    ||    ||    ||    | Six bit groups to index alphabet
          //          >>18  >>12  >> 6  >> 0  Right shift necessary
          //                0x3f  0x3f  0x3f  Additional AND
  
          // Create buffer with zero-padding if there are only one or two
          // significant bytes passed in the array.
          // We have to shift left 24 in order to flush out the 1's that appear
          // when Java treats a value as negative that is cast from a byte to an int.
          int inBuff =
                  (numSigBytes > 0 ? ((source[srcOffset] << 24) >>> 8) : 0)
                  | (numSigBytes > 1 ? ((source[srcOffset + 1] << 24) >>> 16) : 0)
                  | (numSigBytes > 2 ? ((source[srcOffset + 2] << 24) >>> 24) : 0);
  
          switch (numSigBytes) {
              case 3:
                  destination[destOffset] = alphabet[(inBuff >>> 18)];
                  destination[destOffset + 1] = alphabet[(inBuff >>> 12) & 0x3f];
                  destination[destOffset + 2] = alphabet[(inBuff >>> 6) & 0x3f];
                  destination[destOffset + 3] = alphabet[(inBuff) & 0x3f];
                  return destination;
              case 2:
                  destination[destOffset] = alphabet[(inBuff >>> 18)];
                  destination[destOffset + 1] = alphabet[(inBuff >>> 12) & 0x3f];
                  destination[destOffset + 2] = alphabet[(inBuff >>> 6) & 0x3f];
                  destination[destOffset + 3] = EQUALS_SIGN;
                  return destination;
              case 1:
                  destination[destOffset] = alphabet[(inBuff >>> 18)];
  