gemrb/plugins/ACMReader/unpacker.h

   1 /* GemRB - Infinity Engine Emulator
   2  * Copyright (C) 2003 The GemRB Project
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * as published by the Free Software Foundation; either version 2
   7  * of the License, or (at your option) any later version.
   8
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  17  *
  18  *
  19  */
  20
  21 #ifndef _ACM_LAB_VALUE_UNPACKER_H
  22 #define _ACM_LAB_VALUE_UNPACKER_H
  23
  24 #include "DataStream.h"
  25
  26 class CValueUnpacker {
  27 private:
  28         // Parameters of ACM stream
  29         int levels, subblocks;
  30         //FILE* file;
  31         DataStream* stream;
  32         // Bits
  33         unsigned int next_bits; // new bits
  34         int avail_bits; // count of new bits
  35
  36         int sb_size, block_size;
  37         short* amp_buffer, * buff_middle;
  38         int* block_ptr;
  39
  40         // Reading routines
  41         void prepare_bits(int bits); // request bits
  42         int get_bits(int bits); // request and return next bits
  43 public:
  44         // These functions are used to fill the buffer with the amplitude values
  45         int return0(int pass, int ind);
  46         int zero_fill(int pass, int ind);
  47         int linear_fill(int pass, int ind);
  48
  49         int k1_3bits(int pass, int ind);
  50         int k1_2bits(int pass, int ind);
  51         int t1_5bits(int pass, int ind);
  52
  53         int k2_4bits(int pass, int ind);
  54         int k2_3bits(int pass, int ind);
  55         int t2_7bits(int pass, int ind);
  56
  57         int k3_5bits(int pass, int ind);
  58         int k3_4bits(int pass, int ind);
  59
  60         int k4_5bits(int pass, int ind);
  61         int k4_4bits(int pass, int ind);
  62
  63         int t3_7bits(int pass, int ind);
  64
  65
  66         CValueUnpacker(int lev_cnt, int sb_count, DataStream* stream)
  67                 : levels( lev_cnt ), subblocks( sb_count ), next_bits( 0 ),
  68                 avail_bits( 0 ), sb_size( 1 << levels ),
  69                 block_size( sb_size*subblocks ), amp_buffer( NULL ),
  70                 buff_middle( NULL ), block_ptr( NULL )
  71         {
  72                 this->stream = stream;
  73         }
  74         virtual ~CValueUnpacker()
  75         {
  76                 if (amp_buffer) {
  77                         free(amp_buffer);
  78                         amp_buffer = NULL;
  79                 }
  80         }
  81
  82         int init_unpacker();
  83         int get_one_block(int* block);
  84 };
  85
  86 typedef int (CValueUnpacker::* FillerProc) (int pass, int ind);
  87
  88 #endif