content: /* ***** BEGIN LICENSE BLOCK *****
   * Version: MPL 1.1/GPL 2.0/LGPL 2.1
   *
   * The contents of this file are subject to the Mozilla Public License Version
   * 1.1 (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.mozilla.org/MPL/
   *
   * Software distributed under the License is distributed on an "AS IS" basis,
   * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
   * for the specific language governing rights and limitations under the
   * License.
   *
   * The Original Code is mozilla.org code.
   *
   * The Initial Developer of the Original Code is
   * Netscape Communications Corporation.
   * Portions created by the Initial Developer are Copyright (C) 1998
   * the Initial Developer. All Rights Reserved.
   *
   * Contributor(s):
   *   Kohei TAKETA <k-tak@void.in> (Java port)
   *
   * Alternatively, the contents of this file may be used under the terms of
   * either the GNU General Public License Version 2 or later (the "GPL"), or
   * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
   * in which case the provisions of the GPL or the LGPL are applicable instead
   * of those above. If you wish to allow use of your version of this file only
   * under the terms of either the GPL or the LGPL, and not to allow others to
   * use your version of this file under the terms of the MPL, indicate your
   * decision by deleting the provisions above and replace them with the notice
   * and other provisions required by the GPL or the LGPL. If you do not delete
   * the provisions above, a recipient may use your version of this file under
   * the terms of any one of the MPL, the GPL or the LGPL.
   *
   * ***** END LICENSE BLOCK ***** */
  
  package org.mozilla.universalchardet.prober.statemachine;
  
  public class PkgInt {
      ////////////////////////////////////////////////////////////////
      // constants
      ////////////////////////////////////////////////////////////////
      public static final int INDEX_SHIFT_4BITS   = 3;
      public static final int INDEX_SHIFT_8BITS   = 2;
      public static final int INDEX_SHIFT_16BITS  = 1;
      
      public static final int SHIFT_MASK_4BITS    = 7;
      public static final int SHIFT_MASK_8BITS    = 3;
      public static final int SHIFT_MASK_16BITS   = 1;
      
      public static final int BIT_SHIFT_4BITS     = 2;
      public static final int BIT_SHIFT_8BITS     = 3;
      public static final int BIT_SHIFT_16BITS    = 4;
      
      public static final int UNIT_MASK_4BITS     = 0x0000000F;
      public static final int UNIT_MASK_8BITS     = 0x000000FF;
      public static final int UNIT_MASK_16BITS    = 0x0000FFFF;
  
      
      ////////////////////////////////////////////////////////////////
      // fields
      ////////////////////////////////////////////////////////////////
      private int     indexShift;
      private int     shiftMask;
      private int     bitShift;
      private int     unitMask;
      private int[]   data;
      
  
      ////////////////////////////////////////////////////////////////
      // methods
      ////////////////////////////////////////////////////////////////
      public PkgInt(
              int indexShift,
              int shiftMask,
              int bitShift,
              int unitMask,
              int[] data)
      {
          this.indexShift = indexShift;
          this.shiftMask = shiftMask;
          this.bitShift = bitShift;
          this.unitMask = unitMask;
          this.data = data.clone();
      }
      
      public static int pack16bits(int a, int b)
      {
          return ((b << 16) | a);
      }
      
      public static int pack8bits(int a, int b, int c, int d)
      {
          return pack16bits(
                  (b << 8) | a,
                  (d << 8) | c
                  );
      }
      
      public static int pack4bits(int a, int b, int c, int d, int e, int f, int g, int h)
      {
          return pack8bits(
                  (b << 4) | a,
                  (d << 4) | c,
                  (f << 4) | e,
                  (h << 4) | g
                  );
      }
      
      public int unpack(int i)
      {
          return (
                  (this.data[i>>this.indexShift] >> ((i&this.shiftMask)<<this.bitShift)) & this.unitMask
                  );
      }
  }
  