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/*****
* SPC7110 emulator - version 0.03 (2008-08-10)
* Copyright (c) 2008, byuu and neviksti
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* The software is provided "as is" and the author disclaims all warranties
* with regard to this software including all implied warranties of
* merchantibility and fitness, in no event shall the author be liable for
* any special, direct, indirect, or consequential damages or any damages
* whatsoever resulting from loss of use, data or profits, whether in an
* action of contract, negligence or other tortious action, arising out of
* or in connection with the use or performance of this software.
*****/
#ifndef _SPC7110DEC_H_
#define _SPC7110DEC_H_
class SPC7110Decomp {
public:
uint8 read();
void init(unsigned mode, unsigned offset, unsigned index);
void reset();
SPC7110Decomp();
~SPC7110Decomp();
unsigned decomp_mode;
unsigned decomp_offset;
//read() will spool chunks half the size of decomp_buffer_size
enum { decomp_buffer_size = SPC7110_DECOMP_BUFFER_SIZE }; //must be >= 64, and must be a power of two
uint8 *decomp_buffer;
unsigned decomp_buffer_rdoffset;
unsigned decomp_buffer_wroffset;
unsigned decomp_buffer_length;
void write(uint8 data);
uint8 dataread();
void mode0(bool init);
void mode1(bool init);
void mode2(bool init);
static const uint8 evolution_table[53][4];
static const uint8 mode2_context_table[32][2];
struct ContextState {
uint8 index;
uint8 invert;
} context[32];
uint8 probability(unsigned n);
uint8 next_lps(unsigned n);
uint8 next_mps(unsigned n);
bool toggle_invert(unsigned n);
unsigned morton16[2][256];
unsigned morton32[4][256];
unsigned morton_2x8(unsigned data);
unsigned morton_4x8(unsigned data);
};
#endif
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