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