RLWaveletTree.h

   1 /***************************************************************************
   2  *   Copyright (C) 2007 by Veli Mäkinen                                    *
   3  *                                                                         *
   4  *                                                                         *
   5  *   This program is free software; you can redistribute it and/or modify  *
   6  *   it under the terms of the GNU General Public License as published by  *
   7  *   the Free Software Foundation; either version 2 of the License, or     *
   8  *   (at your option) any later version.                                   *
   9  *                                                                         *
  10  *   This program is distributed in the hope that it will be useful,       *
  11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  13  *   GNU General Public License for more details.                          *
  14  *                                                                         *
  15  *   You should have received a copy of the GNU General Public License     *
  16  *   along with this program; if not, write to the                         *
  17  *   Free Software Foundation, Inc.,                                       *
  18  *   51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.         *
  19  ***************************************************************************/
  20
  21 /*
  22  * Wavelet tree by Veli Mäkinen,
  23  */
  24
  25 #ifndef _RLWAVELETTREE_H_
  26 #define _RLWAVELETTREE_H_
  27 #include "GapEncode.h"
  28 #include "Tools.h"
  29 #include "BitRank.h"
  30
  31 class RLWaveletTree {
  32 private:
  33         ulong n;
  34         ulong maxlevel;
  35         ulong *leaves; // stores the leaf positions of characters 0..2^maxlevel-1
  36         GapEncode *bitrank;
  37         BitRank *charMap;
  38         void remapAlphabet(uchar*, ulong);
  39
  40         ulong prevRunLen; // Used by charAtPosRun()
  41         ulong prevPos;
  42         ulong prevChar;
  43         ulong prevRank;
  44 public:
  45     RLWaveletTree(uchar *, ulong);
  46     RLWaveletTree(FILE *);
  47     ~RLWaveletTree();
  48
  49     void Save(FILE *) const;
  50    ulong rank(ulong c, ulong i);
  51
  52    ulong select(ulong c, ulong j);
  53
  54    bool IsCharAtPos(ulong c, ulong i);
  55
  56    ulong charAtPos(ulong i);
  57    ulong charAtPos(ulong i, ulong *rank);
  58    ulong charAtPosRun(ulong i, ulong *rank);
  59    double spaceInBits() {
  60        return 0; // Not implemented
  61    }
  62 };
  63
  64 #endif