mirror of https://github.com/bsnes-emu/bsnes.git
82 lines
1.8 KiB
C++
82 lines
1.8 KiB
C++
struct Decomp {
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struct IM { //input manager
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Decomp& self;
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void init(unsigned offset);
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uint8 get_codeword(uint8 code_length);
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IM(SDD1::Decomp& self) : self(self) {}
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private:
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unsigned offset;
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unsigned bit_count;
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};
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struct GCD { //golomb-code decoder
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Decomp& self;
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static const uint8 run_count[256];
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void get_run_count(uint8 code_number, uint8& mps_count, bool& lps_index);
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GCD(SDD1::Decomp& self) : self(self) {}
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};
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struct BG { //bits generator
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Decomp& self;
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void init();
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uint8 get_bit(bool& end_of_run);
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BG(SDD1::Decomp& self, uint8 code_number) : self(self), code_number(code_number) {}
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private:
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const uint8 code_number;
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uint8 mps_count;
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bool lps_index;
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};
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struct PEM { //probability estimation module
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Decomp& self;
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void init();
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uint8 get_bit(uint8 context);
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PEM(SDD1::Decomp& self) : self(self) {}
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private:
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struct State {
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uint8 code_number;
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uint8 next_if_mps;
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uint8 next_if_lps;
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};
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static const State evolution_table[33];
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struct ContextInfo {
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uint8 status;
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uint8 mps;
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} context_info[32];
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};
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struct CM { //context model
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Decomp& self;
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void init(unsigned offset);
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uint8 get_bit();
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CM(SDD1::Decomp& self) : self(self) {}
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private:
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uint8 bitplanes_info;
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uint8 context_bits_info;
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uint8 bit_number;
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uint8 current_bitplane;
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uint16 previous_bitplane_bits[8];
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};
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struct OL { //output logic
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Decomp& self;
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void init(unsigned offset);
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uint8 decompress();
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OL(SDD1::Decomp& self) : self(self) {}
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private:
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uint8 bitplanes_info;
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uint8 r0, r1, r2;
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};
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void init(unsigned offset);
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uint8 read();
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Decomp();
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IM im;
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GCD gcd;
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BG bg0, bg1, bg2, bg3, bg4, bg5, bg6, bg7;
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PEM pem;
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CM cm;
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OL ol;
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};
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