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492 lines
10 KiB
C++
492 lines
10 KiB
C++
//Altered to integrate with Mesen-S's code
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/************************************************************************
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S-DD1'algorithm emulation code
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------------------------------
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Author: Andreas Naive
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Date: August 2003
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Last update: October 2004
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This code is Public Domain. There is no copyright holded by the author.
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Said this, the author wish to explicitly emphasize his inalienable moral rights
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over this piece of intelectual work and the previous research that made it
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possible, as recognized by most of the copyright laws around the world.
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This code is provided 'as-is', with no warranty, expressed or implied.
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No responsability is assumed by the author in connection with it.
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The author is greatly indebted with The Dumper, without whose help and
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patience providing him with real S-DD1 data the research would have never been
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possible. He also wish to note that in the very beggining of his research,
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Neviksti had done some steps in the right direction. By last, the author is
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indirectly indebted to all the people that worked and contributed in the
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S-DD1 issue in the past.
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An algorithm's documentation is available as a separate document.
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The implementation is obvious when the algorithm is
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understood.
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************************************************************************/
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#include "stdafx.h"
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#include "Sdd1Decomp.h"
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#include "Sdd1Mmc.h"
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void SDD1_IM::prepareDecomp(Sdd1Mmc *mmc, uint32_t readAddr)
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{
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_sdd1Mmc = mmc;
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_readAddr = readAddr;
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bit_count = 4;
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}
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////////////////////////////////////////////////////
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uint8_t SDD1_IM::getCodeword(uint8_t code_len)
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{
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uint8_t codeword;
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codeword = _sdd1Mmc->ReadRom(_readAddr) << bit_count;
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++bit_count;
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if(codeword & 0x80) {
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codeword |= _sdd1Mmc->ReadRom(_readAddr + 1) >> (9 - bit_count);
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bit_count += code_len;
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}
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if(bit_count & 0x08) {
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_readAddr++;
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bit_count &= 0x07;
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}
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return codeword;
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}
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void SDD1_IM::Serialize(Serializer &s)
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{
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s.Stream(_readAddr, bit_count);
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}
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SDD1_GCD::SDD1_GCD(SDD1_IM *associatedIM) :
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IM(associatedIM)
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{
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}
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//////////////////////////////////////////////////////
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void SDD1_GCD::getRunCount(uint8_t code_num, uint8_t *MPScount, bool *LPSind)
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{
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const uint8_t run_count[] = {
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0x00, 0x00, 0x01, 0x00, 0x03, 0x01, 0x02, 0x00,
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0x07, 0x03, 0x05, 0x01, 0x06, 0x02, 0x04, 0x00,
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0x0f, 0x07, 0x0b, 0x03, 0x0d, 0x05, 0x09, 0x01,
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0x0e, 0x06, 0x0a, 0x02, 0x0c, 0x04, 0x08, 0x00,
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0x1f, 0x0f, 0x17, 0x07, 0x1b, 0x0b, 0x13, 0x03,
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0x1d, 0x0d, 0x15, 0x05, 0x19, 0x09, 0x11, 0x01,
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0x1e, 0x0e, 0x16, 0x06, 0x1a, 0x0a, 0x12, 0x02,
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0x1c, 0x0c, 0x14, 0x04, 0x18, 0x08, 0x10, 0x00,
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0x3f, 0x1f, 0x2f, 0x0f, 0x37, 0x17, 0x27, 0x07,
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0x3b, 0x1b, 0x2b, 0x0b, 0x33, 0x13, 0x23, 0x03,
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0x3d, 0x1d, 0x2d, 0x0d, 0x35, 0x15, 0x25, 0x05,
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0x39, 0x19, 0x29, 0x09, 0x31, 0x11, 0x21, 0x01,
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0x3e, 0x1e, 0x2e, 0x0e, 0x36, 0x16, 0x26, 0x06,
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0x3a, 0x1a, 0x2a, 0x0a, 0x32, 0x12, 0x22, 0x02,
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0x3c, 0x1c, 0x2c, 0x0c, 0x34, 0x14, 0x24, 0x04,
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0x38, 0x18, 0x28, 0x08, 0x30, 0x10, 0x20, 0x00,
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0x7f, 0x3f, 0x5f, 0x1f, 0x6f, 0x2f, 0x4f, 0x0f,
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0x77, 0x37, 0x57, 0x17, 0x67, 0x27, 0x47, 0x07,
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0x7b, 0x3b, 0x5b, 0x1b, 0x6b, 0x2b, 0x4b, 0x0b,
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0x73, 0x33, 0x53, 0x13, 0x63, 0x23, 0x43, 0x03,
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0x7d, 0x3d, 0x5d, 0x1d, 0x6d, 0x2d, 0x4d, 0x0d,
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0x75, 0x35, 0x55, 0x15, 0x65, 0x25, 0x45, 0x05,
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0x79, 0x39, 0x59, 0x19, 0x69, 0x29, 0x49, 0x09,
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0x71, 0x31, 0x51, 0x11, 0x61, 0x21, 0x41, 0x01,
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0x7e, 0x3e, 0x5e, 0x1e, 0x6e, 0x2e, 0x4e, 0x0e,
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0x76, 0x36, 0x56, 0x16, 0x66, 0x26, 0x46, 0x06,
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0x7a, 0x3a, 0x5a, 0x1a, 0x6a, 0x2a, 0x4a, 0x0a,
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0x72, 0x32, 0x52, 0x12, 0x62, 0x22, 0x42, 0x02,
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0x7c, 0x3c, 0x5c, 0x1c, 0x6c, 0x2c, 0x4c, 0x0c,
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0x74, 0x34, 0x54, 0x14, 0x64, 0x24, 0x44, 0x04,
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0x78, 0x38, 0x58, 0x18, 0x68, 0x28, 0x48, 0x08,
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0x70, 0x30, 0x50, 0x10, 0x60, 0x20, 0x40, 0x00,
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};
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uint8_t codeword = IM->getCodeword(code_num);
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if(codeword & 0x80) {
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*LPSind = 1;
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*MPScount = run_count[codeword >> (code_num ^ 0x07)];
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} else {
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*MPScount = (1 << code_num);
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}
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}
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///////////////////////////////////////////////////////
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SDD1_BG::SDD1_BG(SDD1_GCD *associatedGCD, uint8_t code) :
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code_num(code), GCD(associatedGCD)
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{
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}
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///////////////////////////////////////////////
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void SDD1_BG::prepareDecomp(void)
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{
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MPScount = 0;
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LPSind = 0;
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}
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//////////////////////////////////////////////
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uint8_t SDD1_BG::getBit(bool *endOfRun)
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{
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uint8_t bit;
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if(!(MPScount || LPSind)) GCD->getRunCount(code_num, &MPScount, &LPSind);
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if(MPScount) {
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bit = 0;
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MPScount--;
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} else {
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bit = 1;
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LPSind = 0;
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}
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if(MPScount || LPSind) (*endOfRun) = 0;
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else (*endOfRun) = 1;
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return bit;
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}
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void SDD1_BG::Serialize(Serializer &s)
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{
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s.Stream(MPScount, LPSind);
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}
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/////////////////////////////////////////////////
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SDD1_PEM::SDD1_PEM(SDD1_BG *associatedBG0, SDD1_BG *associatedBG1,
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SDD1_BG *associatedBG2, SDD1_BG *associatedBG3,
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SDD1_BG *associatedBG4, SDD1_BG *associatedBG5,
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SDD1_BG *associatedBG6, SDD1_BG *associatedBG7)
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{
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BG[0] = associatedBG0;
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BG[1] = associatedBG1;
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BG[2] = associatedBG2;
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BG[3] = associatedBG3;
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BG[4] = associatedBG4;
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BG[5] = associatedBG5;
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BG[6] = associatedBG6;
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BG[7] = associatedBG7;
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}
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/////////////////////////////////////////////////////////
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const SDD1_PEM::state SDD1_PEM::evolution_table[] = {
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{ 0,25,25},
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{ 0, 2, 1},
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{ 0, 3, 1},
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{ 0, 4, 2},
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{ 0, 5, 3},
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{ 1, 6, 4},
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{ 1, 7, 5},
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{ 1, 8, 6},
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{ 1, 9, 7},
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{ 2,10, 8},
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{ 2,11, 9},
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{ 2,12,10},
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{ 2,13,11},
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{ 3,14,12},
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{ 3,15,13},
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{ 3,16,14},
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{ 3,17,15},
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{ 4,18,16},
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{ 4,19,17},
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{ 5,20,18},
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{ 5,21,19},
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{ 6,22,20},
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{ 6,23,21},
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{ 7,24,22},
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{ 7,24,23},
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{ 0,26, 1},
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{ 1,27, 2},
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{ 2,28, 4},
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{ 3,29, 8},
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{ 4,30,12},
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{ 5,31,16},
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{ 6,32,18},
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{ 7,24,22}
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};
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//////////////////////////////////////////////////////
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void SDD1_PEM::prepareDecomp(void)
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{
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for(uint8_t i = 0; i < 32; i++) {
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contextInfo[i].status = 0;
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contextInfo[i].MPS = 0;
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}
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}
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/////////////////////////////////////////////////////////
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uint8_t SDD1_PEM::getBit(uint8_t context)
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{
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bool endOfRun;
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uint8_t bit;
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SDD1_ContextInfo *pContInfo = &contextInfo[context];
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uint8_t currStatus = pContInfo->status;
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const state *pState = &SDD1_PEM::evolution_table[currStatus];
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uint8_t currentMPS = pContInfo->MPS;
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bit = (BG[pState->code_num])->getBit(&endOfRun);
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if(endOfRun) {
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if(bit) {
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if(!(currStatus & 0xfe)) (pContInfo->MPS) ^= 0x01;
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(pContInfo->status) = pState->nextIfLPS;
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} else {
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(pContInfo->status) = pState->nextIfMPS;
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}
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}
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return bit ^ currentMPS;
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}
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void SDD1_PEM::Serialize(Serializer &s)
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{
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for(int i = 0; i < 32; i++) {
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s.Stream(contextInfo[i].status, contextInfo[i].MPS);
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}
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}
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//////////////////////////////////////////////////////////////
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SDD1_CM::SDD1_CM(SDD1_PEM *associatedPEM) :
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PEM(associatedPEM)
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{
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}
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//////////////////////////////////////////////////////////////
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void SDD1_CM::prepareDecomp(uint8_t firstByte)
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{
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bitplanesInfo = firstByte & 0xc0;
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contextBitsInfo = firstByte & 0x30;
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bit_number = 0;
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for(int i = 0; i < 8; i++) prevBitplaneBits[i] = 0;
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switch(bitplanesInfo) {
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case 0x00:
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currBitplane = 1;
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break;
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case 0x40:
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currBitplane = 7;
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break;
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case 0x80:
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currBitplane = 3;
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}
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}
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/////////////////////////////////////////////////////////////
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uint8_t SDD1_CM::getBit(void)
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{
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uint8_t currContext;
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uint16_t *context_bits;
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switch(bitplanesInfo) {
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case 0x00:
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currBitplane ^= 0x01;
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break;
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case 0x40:
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currBitplane ^= 0x01;
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if(!(bit_number & 0x7f)) currBitplane = ((currBitplane + 2) & 0x07);
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break;
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case 0x80:
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currBitplane ^= 0x01;
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if(!(bit_number & 0x7f)) currBitplane ^= 0x02;
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break;
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case 0xc0:
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currBitplane = bit_number & 0x07;
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}
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context_bits = &prevBitplaneBits[currBitplane];
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currContext = (currBitplane & 0x01) << 4;
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switch(contextBitsInfo) {
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case 0x00:
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currContext |= ((*context_bits & 0x01c0) >> 5) | (*context_bits & 0x0001);
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break;
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case 0x10:
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currContext |= ((*context_bits & 0x0180) >> 5) | (*context_bits & 0x0001);
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break;
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case 0x20:
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currContext |= ((*context_bits & 0x00c0) >> 5) | (*context_bits & 0x0001);
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break;
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case 0x30:
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currContext |= ((*context_bits & 0x0180) >> 5) | (*context_bits & 0x0003);
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}
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uint8_t bit = PEM->getBit(currContext);
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*context_bits <<= 1;
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*context_bits |= bit;
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bit_number++;
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return bit;
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}
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void SDD1_CM::Serialize(Serializer &s)
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{
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s.Stream(bitplanesInfo, contextBitsInfo, bit_number, currBitplane);
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s.StreamArray(prevBitplaneBits, 8);
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}
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//////////////////////////////////////////////////
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SDD1_OL::SDD1_OL(SDD1_CM *associatedCM) :
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CM(associatedCM)
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{
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}
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///////////////////////////////////////////////////
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void SDD1_OL::prepareDecomp(uint8_t firstByte)
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{
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bitplanesInfo = firstByte & 0xc0;
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_regs[0] = 1;
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}
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///////////////////////////////////////////////////
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uint8_t SDD1_OL::decompressByte()
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{
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switch(bitplanesInfo) {
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case 0x00:
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case 0x40:
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case 0x80:
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if(_regs[0] == 0) {
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_regs[0] = ~_regs[0];
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return _regs[2];
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} else {
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_regs[1] = 0;
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_regs[2] = 0;
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_regs[0] = 0x80;
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while(_regs[0]) {
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if(CM->getBit()) {
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_regs[1] |= _regs[0];
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}
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if(CM->getBit()) {
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_regs[2] |= _regs[0];
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}
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_regs[0] >>= 1;
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}
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return _regs[1];
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}
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break;
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case 0xC0:
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_regs[1] = 0;
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_regs[0] = 0x01;
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while(_regs[0]) {
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if(CM->getBit()) {
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_regs[1] |= _regs[0];
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}
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_regs[0] <<= 1;
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}
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return _regs[1];
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}
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throw std::runtime_error("SDD1_OL::decompressByte: Unexpected value");
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}
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void SDD1_OL::Serialize(Serializer &s)
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{
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s.Stream(bitplanesInfo);
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s.StreamArray(_regs, 3);
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}
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void Sdd1Decomp::Init(Sdd1Mmc *mmc, uint32_t readAddr)
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{
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uint8_t firstByte = mmc->ReadRom(readAddr);
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IM.prepareDecomp(mmc, readAddr);
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BG0.prepareDecomp();
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BG1.prepareDecomp();
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BG2.prepareDecomp();
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BG3.prepareDecomp();
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BG4.prepareDecomp();
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BG5.prepareDecomp();
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BG6.prepareDecomp();
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BG7.prepareDecomp();
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PEM.prepareDecomp();
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CM.prepareDecomp(firstByte);
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OL.prepareDecomp(firstByte);
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}
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uint8_t Sdd1Decomp::GetDecompressedByte()
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{
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return OL.decompressByte();
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}
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void Sdd1Decomp::Serialize(Serializer &s)
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{
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s.Stream(&IM);
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s.Stream(&BG0);
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s.Stream(&BG1);
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s.Stream(&BG2);
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s.Stream(&BG3);
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s.Stream(&BG4);
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s.Stream(&BG5);
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s.Stream(&BG6);
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s.Stream(&BG7);
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s.Stream(&PEM);
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s.Stream(&CM);
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s.Stream(&OL);
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}
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Sdd1Decomp::Sdd1Decomp() :
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GCD(&IM),
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BG0(&GCD, 0), BG1(&GCD, 1), BG2(&GCD, 2), BG3(&GCD, 3),
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BG4(&GCD, 4), BG5(&GCD, 5), BG6(&GCD, 6), BG7(&GCD, 7),
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PEM(&BG0, &BG1, &BG2, &BG3, &BG4, &BG5, &BG6, &BG7),
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CM(&PEM),
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OL(&CM)
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{
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}
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