mirror of https://github.com/bsnes-emu/bsnes.git
453 lines
9.9 KiB
C++
Executable File
453 lines
9.9 KiB
C++
Executable File
#ifdef SDD1_CPP
|
|
|
|
/************************************************************************
|
|
|
|
S-DD1'algorithm emulation code
|
|
------------------------------
|
|
|
|
Author: Andreas Naive
|
|
Date: August 2003
|
|
Last update: October 2004
|
|
|
|
This code is Public Domain. There is no copyright holded by the author.
|
|
Said this, the author wish to explicitly emphasize his inalienable moral rights
|
|
over this piece of intelectual work and the previous research that made it
|
|
possible, as recognized by most of the copyright laws around the world.
|
|
|
|
This code is provided 'as-is', with no warranty, expressed or implied.
|
|
No responsability is assumed by the author in connection with it.
|
|
|
|
The author is greatly indebted with The Dumper, without whose help and
|
|
patience providing him with real S-DD1 data the research would have never been
|
|
possible. He also wish to note that in the very beggining of his research,
|
|
Neviksti had done some steps in the right direction. By last, the author is
|
|
indirectly indebted to all the people that worked and contributed in the
|
|
S-DD1 issue in the past.
|
|
|
|
An algorithm's documentation is available as a separate document.
|
|
The implementation is obvious when the algorithm is
|
|
understood.
|
|
|
|
************************************************************************/
|
|
|
|
typedef uint8 bool8;
|
|
#define SDD1_read(__addr) (sdd1.read(__addr))
|
|
|
|
////////////////////////////////////////////////////
|
|
|
|
|
|
void SDD1_IM::prepareDecomp(uint32 in_buf) {
|
|
|
|
byte_ptr=in_buf;
|
|
bit_count=4;
|
|
|
|
}
|
|
|
|
////////////////////////////////////////////////////
|
|
|
|
|
|
uint8 SDD1_IM::getCodeword(uint8 code_len) {
|
|
|
|
uint8 codeword;
|
|
uint8 comp_count;
|
|
|
|
codeword = (SDD1_read(byte_ptr))<<bit_count;
|
|
|
|
++bit_count;
|
|
|
|
if (codeword & 0x80) {
|
|
codeword |= SDD1_read(byte_ptr+1)>>(9-bit_count);
|
|
bit_count+=code_len;
|
|
}
|
|
|
|
if (bit_count & 0x08) {
|
|
byte_ptr++;
|
|
bit_count&=0x07;
|
|
}
|
|
|
|
return codeword;
|
|
|
|
}
|
|
|
|
//////////////////////////////////////////////////////
|
|
|
|
|
|
SDD1_GCD::SDD1_GCD(SDD1_IM *associatedIM) :
|
|
IM(associatedIM)
|
|
{
|
|
|
|
}
|
|
|
|
//////////////////////////////////////////////////////
|
|
|
|
|
|
void SDD1_GCD::getRunCount(uint8 code_num, uint8 *MPScount, bool8 *LPSind) {
|
|
|
|
const uint8 run_count[] = {
|
|
0x00, 0x00, 0x01, 0x00, 0x03, 0x01, 0x02, 0x00,
|
|
0x07, 0x03, 0x05, 0x01, 0x06, 0x02, 0x04, 0x00,
|
|
0x0f, 0x07, 0x0b, 0x03, 0x0d, 0x05, 0x09, 0x01,
|
|
0x0e, 0x06, 0x0a, 0x02, 0x0c, 0x04, 0x08, 0x00,
|
|
0x1f, 0x0f, 0x17, 0x07, 0x1b, 0x0b, 0x13, 0x03,
|
|
0x1d, 0x0d, 0x15, 0x05, 0x19, 0x09, 0x11, 0x01,
|
|
0x1e, 0x0e, 0x16, 0x06, 0x1a, 0x0a, 0x12, 0x02,
|
|
0x1c, 0x0c, 0x14, 0x04, 0x18, 0x08, 0x10, 0x00,
|
|
0x3f, 0x1f, 0x2f, 0x0f, 0x37, 0x17, 0x27, 0x07,
|
|
0x3b, 0x1b, 0x2b, 0x0b, 0x33, 0x13, 0x23, 0x03,
|
|
0x3d, 0x1d, 0x2d, 0x0d, 0x35, 0x15, 0x25, 0x05,
|
|
0x39, 0x19, 0x29, 0x09, 0x31, 0x11, 0x21, 0x01,
|
|
0x3e, 0x1e, 0x2e, 0x0e, 0x36, 0x16, 0x26, 0x06,
|
|
0x3a, 0x1a, 0x2a, 0x0a, 0x32, 0x12, 0x22, 0x02,
|
|
0x3c, 0x1c, 0x2c, 0x0c, 0x34, 0x14, 0x24, 0x04,
|
|
0x38, 0x18, 0x28, 0x08, 0x30, 0x10, 0x20, 0x00,
|
|
0x7f, 0x3f, 0x5f, 0x1f, 0x6f, 0x2f, 0x4f, 0x0f,
|
|
0x77, 0x37, 0x57, 0x17, 0x67, 0x27, 0x47, 0x07,
|
|
0x7b, 0x3b, 0x5b, 0x1b, 0x6b, 0x2b, 0x4b, 0x0b,
|
|
0x73, 0x33, 0x53, 0x13, 0x63, 0x23, 0x43, 0x03,
|
|
0x7d, 0x3d, 0x5d, 0x1d, 0x6d, 0x2d, 0x4d, 0x0d,
|
|
0x75, 0x35, 0x55, 0x15, 0x65, 0x25, 0x45, 0x05,
|
|
0x79, 0x39, 0x59, 0x19, 0x69, 0x29, 0x49, 0x09,
|
|
0x71, 0x31, 0x51, 0x11, 0x61, 0x21, 0x41, 0x01,
|
|
0x7e, 0x3e, 0x5e, 0x1e, 0x6e, 0x2e, 0x4e, 0x0e,
|
|
0x76, 0x36, 0x56, 0x16, 0x66, 0x26, 0x46, 0x06,
|
|
0x7a, 0x3a, 0x5a, 0x1a, 0x6a, 0x2a, 0x4a, 0x0a,
|
|
0x72, 0x32, 0x52, 0x12, 0x62, 0x22, 0x42, 0x02,
|
|
0x7c, 0x3c, 0x5c, 0x1c, 0x6c, 0x2c, 0x4c, 0x0c,
|
|
0x74, 0x34, 0x54, 0x14, 0x64, 0x24, 0x44, 0x04,
|
|
0x78, 0x38, 0x58, 0x18, 0x68, 0x28, 0x48, 0x08,
|
|
0x70, 0x30, 0x50, 0x10, 0x60, 0x20, 0x40, 0x00,
|
|
};
|
|
|
|
uint8 codeword=IM->getCodeword(code_num);
|
|
|
|
if (codeword & 0x80) {
|
|
*LPSind=1;
|
|
*MPScount=run_count[codeword>>(code_num^0x07)];
|
|
}
|
|
else {
|
|
*MPScount=(1<<code_num);
|
|
}
|
|
|
|
}
|
|
|
|
///////////////////////////////////////////////////////
|
|
|
|
SDD1_BG::SDD1_BG(SDD1_GCD *associatedGCD, uint8 code) :
|
|
GCD(associatedGCD), code_num(code)
|
|
{
|
|
|
|
}
|
|
|
|
///////////////////////////////////////////////
|
|
|
|
|
|
void SDD1_BG::prepareDecomp(void) {
|
|
|
|
MPScount=0;
|
|
LPSind=0;
|
|
|
|
}
|
|
|
|
//////////////////////////////////////////////
|
|
|
|
|
|
uint8 SDD1_BG::getBit(bool8 *endOfRun) {
|
|
|
|
uint8 bit;
|
|
|
|
if (!(MPScount || LPSind)) GCD->getRunCount(code_num, &MPScount, &LPSind);
|
|
|
|
if (MPScount) {
|
|
bit=0;
|
|
MPScount--;
|
|
}
|
|
else {
|
|
bit=1;
|
|
LPSind=0;
|
|
}
|
|
|
|
if (MPScount || LPSind) (*endOfRun)=0;
|
|
else (*endOfRun)=1;
|
|
|
|
return bit;
|
|
|
|
}
|
|
|
|
/////////////////////////////////////////////////
|
|
|
|
|
|
SDD1_PEM::SDD1_PEM(SDD1_BG *associatedBG0, SDD1_BG *associatedBG1,
|
|
SDD1_BG *associatedBG2, SDD1_BG *associatedBG3,
|
|
SDD1_BG *associatedBG4, SDD1_BG *associatedBG5,
|
|
SDD1_BG *associatedBG6, SDD1_BG *associatedBG7) {
|
|
|
|
BG[0]=associatedBG0;
|
|
BG[1]=associatedBG1;
|
|
BG[2]=associatedBG2;
|
|
BG[3]=associatedBG3;
|
|
BG[4]=associatedBG4;
|
|
BG[5]=associatedBG5;
|
|
BG[6]=associatedBG6;
|
|
BG[7]=associatedBG7;
|
|
|
|
}
|
|
|
|
/////////////////////////////////////////////////////////
|
|
|
|
|
|
const SDD1_PEM::state SDD1_PEM::evolution_table[]={
|
|
{ 0,25,25},
|
|
{ 0, 2, 1},
|
|
{ 0, 3, 1},
|
|
{ 0, 4, 2},
|
|
{ 0, 5, 3},
|
|
{ 1, 6, 4},
|
|
{ 1, 7, 5},
|
|
{ 1, 8, 6},
|
|
{ 1, 9, 7},
|
|
{ 2,10, 8},
|
|
{ 2,11, 9},
|
|
{ 2,12,10},
|
|
{ 2,13,11},
|
|
{ 3,14,12},
|
|
{ 3,15,13},
|
|
{ 3,16,14},
|
|
{ 3,17,15},
|
|
{ 4,18,16},
|
|
{ 4,19,17},
|
|
{ 5,20,18},
|
|
{ 5,21,19},
|
|
{ 6,22,20},
|
|
{ 6,23,21},
|
|
{ 7,24,22},
|
|
{ 7,24,23},
|
|
{ 0,26, 1},
|
|
{ 1,27, 2},
|
|
{ 2,28, 4},
|
|
{ 3,29, 8},
|
|
{ 4,30,12},
|
|
{ 5,31,16},
|
|
{ 6,32,18},
|
|
{ 7,24,22}
|
|
};
|
|
|
|
//////////////////////////////////////////////////////
|
|
|
|
|
|
void SDD1_PEM::prepareDecomp(void) {
|
|
|
|
for (uint8 i=0; i<32; i++) {
|
|
contextInfo[i].status=0;
|
|
contextInfo[i].MPS=0;
|
|
}
|
|
|
|
}
|
|
|
|
/////////////////////////////////////////////////////////
|
|
|
|
|
|
uint8 SDD1_PEM::getBit(uint8 context) {
|
|
|
|
bool8 endOfRun;
|
|
uint8 bit;
|
|
|
|
SDD1_ContextInfo *pContInfo=&contextInfo[context];
|
|
uint8 currStatus = pContInfo->status;
|
|
const state *pState=&SDD1_PEM::evolution_table[currStatus];
|
|
uint8 currentMPS=pContInfo->MPS;
|
|
|
|
bit=(BG[pState->code_num])->getBit(&endOfRun);
|
|
|
|
if (endOfRun)
|
|
if (bit) {
|
|
if (!(currStatus & 0xfe)) (pContInfo->MPS)^=0x01;
|
|
(pContInfo->status)=pState->nextIfLPS;
|
|
}
|
|
else
|
|
(pContInfo->status)=pState->nextIfMPS;
|
|
|
|
return bit^currentMPS;
|
|
|
|
}
|
|
|
|
//////////////////////////////////////////////////////////////
|
|
|
|
|
|
SDD1_CM::SDD1_CM(SDD1_PEM *associatedPEM) :
|
|
PEM(associatedPEM)
|
|
{
|
|
|
|
}
|
|
|
|
//////////////////////////////////////////////////////////////
|
|
|
|
|
|
void SDD1_CM::prepareDecomp(uint32 first_byte) {
|
|
|
|
bitplanesInfo = SDD1_read(first_byte) & 0xc0;
|
|
contextBitsInfo = SDD1_read(first_byte) & 0x30;
|
|
bit_number=0;
|
|
for (int i=0; i<8; i++) prevBitplaneBits[i]=0;
|
|
switch (bitplanesInfo) {
|
|
case 0x00:
|
|
currBitplane = 1;
|
|
break;
|
|
case 0x40:
|
|
currBitplane = 7;
|
|
break;
|
|
case 0x80:
|
|
currBitplane = 3;
|
|
}
|
|
|
|
}
|
|
|
|
/////////////////////////////////////////////////////////////
|
|
|
|
|
|
uint8 SDD1_CM::getBit(void) {
|
|
|
|
uint8 currContext;
|
|
uint16 *context_bits;
|
|
|
|
switch (bitplanesInfo) {
|
|
case 0x00:
|
|
currBitplane ^= 0x01;
|
|
break;
|
|
case 0x40:
|
|
currBitplane ^= 0x01;
|
|
if (!(bit_number & 0x7f)) currBitplane = ((currBitplane+2) & 0x07);
|
|
break;
|
|
case 0x80:
|
|
currBitplane ^= 0x01;
|
|
if (!(bit_number & 0x7f)) currBitplane ^= 0x02;
|
|
break;
|
|
case 0xc0:
|
|
currBitplane = bit_number & 0x07;
|
|
}
|
|
|
|
context_bits = &prevBitplaneBits[currBitplane];
|
|
|
|
currContext=(currBitplane & 0x01)<<4;
|
|
switch (contextBitsInfo) {
|
|
case 0x00:
|
|
currContext|=((*context_bits & 0x01c0)>>5)|(*context_bits & 0x0001);
|
|
break;
|
|
case 0x10:
|
|
currContext|=((*context_bits & 0x0180)>>5)|(*context_bits & 0x0001);
|
|
break;
|
|
case 0x20:
|
|
currContext|=((*context_bits & 0x00c0)>>5)|(*context_bits & 0x0001);
|
|
break;
|
|
case 0x30:
|
|
currContext|=((*context_bits & 0x0180)>>5)|(*context_bits & 0x0003);
|
|
}
|
|
|
|
uint8 bit=PEM->getBit(currContext);
|
|
|
|
*context_bits <<= 1;
|
|
*context_bits |= bit;
|
|
|
|
bit_number++;
|
|
|
|
return bit;
|
|
|
|
}
|
|
|
|
//////////////////////////////////////////////////
|
|
|
|
|
|
SDD1_OL::SDD1_OL(SDD1_CM *associatedCM) :
|
|
CM(associatedCM)
|
|
{
|
|
|
|
}
|
|
|
|
///////////////////////////////////////////////////
|
|
|
|
|
|
void SDD1_OL::prepareDecomp(uint32 first_byte, uint16 out_len, uint8 *out_buf) {
|
|
|
|
bitplanesInfo = SDD1_read(first_byte) & 0xc0;
|
|
length=out_len;
|
|
buffer=out_buf;
|
|
|
|
}
|
|
|
|
///////////////////////////////////////////////////
|
|
|
|
|
|
void SDD1_OL::launch(void) {
|
|
|
|
uint8 i;
|
|
uint8 register1, register2;
|
|
|
|
switch (bitplanesInfo) {
|
|
case 0x00:
|
|
case 0x40:
|
|
case 0x80:
|
|
i=1;
|
|
do { //if length==0, we output 2^16 bytes
|
|
if (!i) {
|
|
*(buffer++)=register2;
|
|
i=~i;
|
|
}
|
|
else {
|
|
for (register1=register2=0, i=0x80; i; i>>=1) {
|
|
if (CM->getBit()) register1 |= i;
|
|
if (CM->getBit()) register2 |= i;
|
|
}
|
|
*(buffer++)=register1;
|
|
}
|
|
} while (--length);
|
|
break;
|
|
case 0xc0:
|
|
do {
|
|
for (register1=0, i=0x01; i; i<<=1) {
|
|
if (CM->getBit()) register1 |= i;
|
|
}
|
|
*(buffer++)=register1;
|
|
} while (--length);
|
|
}
|
|
|
|
}
|
|
|
|
///////////////////////////////////////////////////////
|
|
|
|
|
|
void SDD1emu::decompress(uint32 in_buf, uint16 out_len, uint8 *out_buf) {
|
|
|
|
IM.prepareDecomp(in_buf);
|
|
BG0.prepareDecomp();
|
|
BG1.prepareDecomp();
|
|
BG2.prepareDecomp();
|
|
BG3.prepareDecomp();
|
|
BG4.prepareDecomp();
|
|
BG5.prepareDecomp();
|
|
BG6.prepareDecomp();
|
|
BG7.prepareDecomp();
|
|
PEM.prepareDecomp();
|
|
CM.prepareDecomp(in_buf);
|
|
OL.prepareDecomp(in_buf, out_len, out_buf);
|
|
|
|
OL.launch();
|
|
|
|
}
|
|
|
|
////////////////////////////////////////////////////////////
|
|
|
|
|
|
SDD1emu::SDD1emu() :
|
|
GCD(&IM),
|
|
BG0(&GCD, 0), BG1(&GCD, 1), BG2(&GCD, 2), BG3(&GCD, 3),
|
|
BG4(&GCD, 4), BG5(&GCD, 5), BG6(&GCD, 6), BG7(&GCD, 7),
|
|
PEM(&BG0, &BG1, &BG2, &BG3, &BG4, &BG5, &BG6, &BG7),
|
|
CM(&PEM),
|
|
OL(&CM)
|
|
{
|
|
|
|
}
|
|
|
|
///////////////////////////////////////////////////////////
|
|
|
|
#endif
|