mirror of https://github.com/bsnes-emu/bsnes.git
82 lines
1.8 KiB
C++
Executable File
82 lines
1.8 KiB
C++
Executable File
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;
|
|
};
|