mirror of https://github.com/snes9xgit/snes9x.git
68 lines
1.9 KiB
C
68 lines
1.9 KiB
C
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/*****
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* SPC7110 emulator - version 0.03 (2008-08-10)
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* Copyright (c) 2008, byuu and neviksti
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* The software is provided "as is" and the author disclaims all warranties
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* with regard to this software including all implied warranties of
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* merchantibility and fitness, in no event shall the author be liable for
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* any special, direct, indirect, or consequential damages or any damages
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* whatsoever resulting from loss of use, data or profits, whether in an
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* action of contract, negligence or other tortious action, arising out of
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* or in connection with the use or performance of this software.
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*****/
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#ifndef _SPC7110DEC_H_
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#define _SPC7110DEC_H_
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class SPC7110Decomp {
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public:
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uint8 read();
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void init(unsigned mode, unsigned offset, unsigned index);
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void reset();
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SPC7110Decomp();
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~SPC7110Decomp();
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unsigned decomp_mode;
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unsigned decomp_offset;
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//read() will spool chunks half the size of decomp_buffer_size
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enum { decomp_buffer_size = SPC7110_DECOMP_BUFFER_SIZE }; //must be >= 64, and must be a power of two
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uint8 *decomp_buffer;
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unsigned decomp_buffer_rdoffset;
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unsigned decomp_buffer_wroffset;
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unsigned decomp_buffer_length;
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void write(uint8 data);
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uint8 dataread();
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void mode0(bool init);
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void mode1(bool init);
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void mode2(bool init);
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static const uint8 evolution_table[53][4];
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static const uint8 mode2_context_table[32][2];
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struct ContextState {
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uint8 index;
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uint8 invert;
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} context[32];
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uint8 probability(unsigned n);
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uint8 next_lps(unsigned n);
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uint8 next_mps(unsigned n);
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bool toggle_invert(unsigned n);
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unsigned morton16[2][256];
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unsigned morton32[4][256];
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unsigned morton_2x8(unsigned data);
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unsigned morton_4x8(unsigned data);
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};
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#endif
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