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