/
cartridge.cpp
773 lines (666 loc) · 19.3 KB
/
cartridge.cpp
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//
// Copyright (C) 2007-2010 by sinamas <sinamas at users.sourceforge.net>
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License version 2 as
// published by the Free Software Foundation.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License version 2 for more details.
//
// You should have received a copy of the GNU General Public License
// version 2 along with this program; if not, write to the
// Free Software Foundation, Inc.,
// 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
//
#include "cartridge.h"
#include "file/file.h"
#include "../savestate.h"
#include "pakinfo_internal.h"
#include <cstring>
#include <fstream>
namespace gambatte {
namespace {
static unsigned toMulti64Rombank(unsigned rombank) {
return (rombank >> 1 & 0x30) | (rombank & 0xF);
}
class DefaultMbc : public Mbc {
public:
virtual bool isAddressWithinAreaRombankCanBeMappedTo(unsigned addr, unsigned bank) const {
return (addr< 0x4000) == (bank == 0);
}
};
class Mbc0 : public DefaultMbc {
public:
explicit Mbc0(MemPtrs &memptrs)
: memptrs_(memptrs)
, enableRam_(false)
{
}
virtual void romWrite(unsigned const p, unsigned const data) {
if (p < 0x2000) {
enableRam_ = (data & 0xF) == 0xA;
memptrs_.setRambank(enableRam_ ? MemPtrs::read_en | MemPtrs::write_en : 0, 0);
}
}
virtual void saveState(SaveState::Mem &ss) const {
ss.enableRam = enableRam_;
}
virtual void loadState(SaveState::Mem const &ss) {
enableRam_ = ss.enableRam;
memptrs_.setRambank(enableRam_ ? MemPtrs::read_en | MemPtrs::write_en : 0, 0);
}
private:
MemPtrs &memptrs_;
bool enableRam_;
};
static inline unsigned rambanks(MemPtrs const &memptrs) {
return std::size_t(memptrs.rambankdataend() - memptrs.rambankdata()) / 0x2000;
}
static inline unsigned rombanks(MemPtrs const &memptrs) {
return std::size_t(memptrs.romdataend() - memptrs.romdata() ) / 0x4000;
}
class Mbc1 : public DefaultMbc {
public:
explicit Mbc1(MemPtrs &memptrs)
: memptrs_(memptrs)
, rombank_(1)
, rambank_(0)
, enableRam_(false)
, rambankMode_(false)
{
}
virtual void romWrite(unsigned const p, unsigned const data) {
switch (p >> 13 & 3) {
case 0:
enableRam_ = (data & 0xF) == 0xA;
setRambank();
break;
case 1:
rombank_ = rambankMode_ ? data & 0x1F : (rombank_ & 0x60) | (data & 0x1F);
setRombank();
break;
case 2:
if (rambankMode_) {
rambank_ = data & 3;
setRambank();
} else {
rombank_ = (data << 5 & 0x60) | (rombank_ & 0x1F);
setRombank();
}
break;
case 3:
// Pretty sure this should take effect immediately, but I have a policy not to change old behavior
// unless I have something (eg. a verified test or a game) that justifies it.
rambankMode_ = data & 1;
break;
}
}
virtual void saveState(SaveState::Mem &ss) const {
ss.rombank = rombank_;
ss.rambank = rambank_;
ss.enableRam = enableRam_;
ss.rambankMode = rambankMode_;
}
virtual void loadState(SaveState::Mem const &ss) {
rombank_ = ss.rombank;
rambank_ = ss.rambank;
enableRam_ = ss.enableRam;
rambankMode_ = ss.rambankMode;
setRambank();
setRombank();
}
private:
MemPtrs &memptrs_;
unsigned char rombank_;
unsigned char rambank_;
bool enableRam_;
bool rambankMode_;
static unsigned adjustedRombank(unsigned bank) { return bank & 0x1F ? bank : bank | 1; }
void setRambank() const {
memptrs_.setRambank(enableRam_ ? MemPtrs::read_en | MemPtrs::write_en : 0,
rambank_ & (rambanks(memptrs_) - 1));
}
void setRombank() const { memptrs_.setRombank(adjustedRombank(rombank_) & (rombanks(memptrs_) - 1)); }
};
class Mbc1Multi64 : public Mbc {
public:
explicit Mbc1Multi64(MemPtrs &memptrs)
: memptrs_(memptrs)
, rombank_(1)
, enableRam_(false)
, rombank0Mode_(false)
{
}
virtual void romWrite(unsigned const p, unsigned const data) {
switch (p >> 13 & 3) {
case 0:
enableRam_ = (data & 0xF) == 0xA;
memptrs_.setRambank(enableRam_ ? MemPtrs::read_en | MemPtrs::write_en : 0, 0);
break;
case 1:
rombank_ = (rombank_ & 0x60) | (data & 0x1F);
memptrs_.setRombank(rombank0Mode_
? adjustedRombank(toMulti64Rombank(rombank_))
: adjustedRombank(rombank_) & (rombanks(memptrs_) - 1));
break;
case 2:
rombank_ = (data << 5 & 0x60) | (rombank_ & 0x1F);
setRombank();
break;
case 3:
rombank0Mode_ = data & 1;
setRombank();
break;
}
}
virtual void saveState(SaveState::Mem &ss) const {
ss.rombank = rombank_;
ss.enableRam = enableRam_;
ss.rambankMode = rombank0Mode_;
}
virtual void loadState(SaveState::Mem const &ss) {
rombank_ = ss.rombank;
enableRam_ = ss.enableRam;
rombank0Mode_ = ss.rambankMode;
memptrs_.setRambank(enableRam_ ? MemPtrs::read_en | MemPtrs::write_en : 0, 0);
setRombank();
}
virtual bool isAddressWithinAreaRombankCanBeMappedTo(unsigned addr, unsigned bank) const {
return (addr < 0x4000) == ((bank & 0xF) == 0);
}
private:
MemPtrs &memptrs_;
unsigned char rombank_;
bool enableRam_;
bool rombank0Mode_;
static unsigned adjustedRombank(unsigned bank) { return bank & 0x1F ? bank : bank | 1; }
void setRombank() const {
if (rombank0Mode_) {
unsigned const rb = toMulti64Rombank(rombank_);
memptrs_.setRombank0(rb & 0x30);
memptrs_.setRombank(adjustedRombank(rb));
} else {
memptrs_.setRombank0(0);
memptrs_.setRombank(adjustedRombank(rombank_) & (rombanks(memptrs_) - 1));
}
}
};
class Mbc2 : public DefaultMbc {
public:
explicit Mbc2(MemPtrs &memptrs)
: memptrs_(memptrs)
, rombank_(1)
, enableRam_(false)
{
}
virtual void romWrite(unsigned const p, unsigned const data) {
switch (p & 0x6100) {
case 0x0000:
enableRam_ = (data & 0xF) == 0xA;
memptrs_.setRambank(enableRam_ ? MemPtrs::read_en | MemPtrs::write_en : 0, 0);
break;
case 0x2100:
rombank_ = data & 0xF;
memptrs_.setRombank(rombank_ & (rombanks(memptrs_) - 1));
break;
}
}
virtual void saveState(SaveState::Mem &ss) const {
ss.rombank = rombank_;
ss.enableRam = enableRam_;
}
virtual void loadState(SaveState::Mem const &ss) {
rombank_ = ss.rombank;
enableRam_ = ss.enableRam;
memptrs_.setRambank(enableRam_ ? MemPtrs::read_en | MemPtrs::write_en : 0, 0);
memptrs_.setRombank(rombank_ & (rombanks(memptrs_) - 1));
}
private:
MemPtrs &memptrs_;
unsigned char rombank_;
bool enableRam_;
};
class Mbc3 : public DefaultMbc {
public:
Mbc3(MemPtrs &memptrs, Rtc *const rtc)
: memptrs_(memptrs)
, rtc_(rtc)
, rombank_(1)
, rambank_(0)
, enableRam_(false)
{
}
virtual void romWrite(unsigned const p, unsigned const data) {
switch (p >> 13 & 3) {
case 0:
enableRam_ = (data & 0xF) == 0xA;
setRambank();
break;
case 1:
rombank_ = data & 0x7F;
setRombank();
break;
case 2:
rambank_ = data;
setRambank();
break;
case 3:
if (rtc_)
rtc_->latch(data);
break;
}
}
virtual void saveState(SaveState::Mem &ss) const {
ss.rombank = rombank_;
ss.rambank = rambank_;
ss.enableRam = enableRam_;
}
virtual void loadState(SaveState::Mem const &ss) {
rombank_ = ss.rombank;
rambank_ = ss.rambank;
enableRam_ = ss.enableRam;
setRambank();
setRombank();
}
private:
MemPtrs &memptrs_;
Rtc *const rtc_;
unsigned char rombank_;
unsigned char rambank_;
bool enableRam_;
void setRambank() const {
unsigned flags = enableRam_ ? MemPtrs::read_en | MemPtrs::write_en : 0;
if (rtc_) {
rtc_->set(enableRam_, rambank_);
if (rtc_->activeData())
flags |= MemPtrs::rtc_en;
}
memptrs_.setRambank(flags, rambank_ & (rambanks(memptrs_) - 1));
}
void setRombank() const {
memptrs_.setRombank(std::max(rombank_ & (rombanks(memptrs_) - 1), 1u));
}
};
class HuC1 : public DefaultMbc {
public:
explicit HuC1(MemPtrs &memptrs)
: memptrs_(memptrs)
, rombank_(1)
, rambank_(0)
, enableRam_(false)
, rambankMode_(false)
{
}
virtual void romWrite(unsigned const p, unsigned const data) {
switch (p >> 13 & 3) {
case 0:
enableRam_ = (data & 0xF) == 0xA;
setRambank();
break;
case 1:
rombank_ = data & 0x3F;
setRombank();
break;
case 2:
rambank_ = data & 3;
rambankMode_ ? setRambank() : setRombank();
break;
case 3:
rambankMode_ = data & 1;
setRambank();
setRombank();
break;
}
}
virtual void saveState(SaveState::Mem &ss) const {
ss.rombank = rombank_;
ss.rambank = rambank_;
ss.enableRam = enableRam_;
ss.rambankMode = rambankMode_;
}
virtual void loadState(SaveState::Mem const &ss) {
rombank_ = ss.rombank;
rambank_ = ss.rambank;
enableRam_ = ss.enableRam;
rambankMode_ = ss.rambankMode;
setRambank();
setRombank();
}
private:
MemPtrs &memptrs_;
unsigned char rombank_;
unsigned char rambank_;
bool enableRam_;
bool rambankMode_;
void setRambank() const {
memptrs_.setRambank(enableRam_ ? MemPtrs::read_en | MemPtrs::write_en : MemPtrs::read_en,
rambankMode_ ? rambank_ & (rambanks(memptrs_) - 1) : 0);
}
void setRombank() const {
memptrs_.setRombank((rambankMode_ ? rombank_ : rambank_ << 6 | rombank_)
& (rombanks(memptrs_) - 1));
}
};
class Mbc5 : public DefaultMbc {
public:
explicit Mbc5(MemPtrs &memptrs)
: memptrs_(memptrs)
, rombank_(1)
, rambank_(0)
, enableRam_(false)
{
}
virtual void romWrite(unsigned const p, unsigned const data) {
switch (p >> 13 & 3) {
case 0:
enableRam_ = (data & 0xF) == 0xA;
setRambank();
break;
case 1:
rombank_ = p < 0x3000
? (rombank_ & 0x100) | data
: (data << 8 & 0x100) | (rombank_ & 0xFF);
setRombank();
break;
case 2:
rambank_ = data & 0xF;
setRambank();
break;
case 3:
break;
}
}
virtual void saveState(SaveState::Mem &ss) const {
ss.rombank = rombank_;
ss.rambank = rambank_;
ss.enableRam = enableRam_;
}
virtual void loadState(SaveState::Mem const &ss) {
rombank_ = ss.rombank;
rambank_ = ss.rambank;
enableRam_ = ss.enableRam;
setRambank();
setRombank();
}
private:
MemPtrs &memptrs_;
unsigned short rombank_;
unsigned char rambank_;
bool enableRam_;
static unsigned adjustedRombank(unsigned bank) { return bank ? bank : 1; }
void setRambank() const {
memptrs_.setRambank(enableRam_ ? MemPtrs::read_en | MemPtrs::write_en : 0,
rambank_ & (rambanks(memptrs_) - 1));
}
void setRombank() const { memptrs_.setRombank(adjustedRombank(rombank_) & (rombanks(memptrs_) - 1)); }
};
static bool hasRtc(unsigned headerByte0x147) {
switch (headerByte0x147) {
case 0x0F:
case 0x10: return true;
default: return false;
}
}
}
void Cartridge::setStatePtrs(SaveState &state) {
state.mem.vram.set(memptrs_.vramdata(), memptrs_.vramdataend() - memptrs_.vramdata());
state.mem.sram.set(memptrs_.rambankdata(), memptrs_.rambankdataend() - memptrs_.rambankdata());
state.mem.wram.set(memptrs_.wramdata(0), memptrs_.wramdataend() - memptrs_.wramdata(0));
}
void Cartridge::saveState(SaveState &state) const {
mbc_->saveState(state.mem);
rtc_.saveState(state);
}
void Cartridge::loadState(SaveState const &state) {
rtc_.loadState(state);
mbc_->loadState(state.mem);
}
static std::string const stripExtension(std::string const &str) {
std::string::size_type const lastDot = str.find_last_of('.');
std::string::size_type const lastSlash = str.find_last_of('/');
if (lastDot != std::string::npos && (lastSlash == std::string::npos || lastSlash < lastDot))
return str.substr(0, lastDot);
return str;
}
static std::string const stripDir(std::string const &str) {
std::string::size_type const lastSlash = str.find_last_of('/');
if (lastSlash != std::string::npos)
return str.substr(lastSlash + 1);
return str;
}
std::string const Cartridge::saveBasePath() const {
return saveDir_.empty()
? defaultSaveBasePath_
: saveDir_ + stripDir(defaultSaveBasePath_);
}
void Cartridge::setSaveDir(std::string const &dir) {
saveDir_ = dir;
if (!saveDir_.empty() && saveDir_[saveDir_.length() - 1] != '/')
saveDir_ += '/';
}
static void enforce8bit(unsigned char *data, std::size_t size) {
if (static_cast<unsigned char>(0x100))
while (size--)
*data++ &= 0xFF;
}
static unsigned pow2ceil(unsigned n) {
--n;
n |= n >> 1;
n |= n >> 2;
n |= n >> 4;
n |= n >> 8;
++n;
return n;
}
static bool presumedMulti64Mbc1(unsigned char const header[], unsigned rombanks) {
return header[0x147] == 1 && header[0x149] == 0 && rombanks == 64;
}
LoadRes Cartridge::loadROM(std::string const &romfile,
bool const forceDmg,
bool const multicartCompat)
{
scoped_ptr<File> const rom(newFileInstance(romfile));
if (rom->fail())
return LOADRES_IO_ERROR;
enum Cartridgetype { type_plain,
type_mbc1,
type_mbc2,
type_mbc3,
type_mbc5,
type_huc1 };
Cartridgetype type = type_plain;
unsigned rambanks = 1;
unsigned rombanks = 2;
bool cgb = false;
{
unsigned char header[0x150];
rom->read(reinterpret_cast<char *>(header), sizeof header);
switch (header[0x0147]) {
case 0x00: type = type_plain; break;
case 0x01:
case 0x02:
case 0x03: type = type_mbc1; break;
case 0x05:
case 0x06: type = type_mbc2; break;
case 0x08:
case 0x09: type = type_plain; break;
case 0x0B:
case 0x0C:
case 0x0D: return LOADRES_UNSUPPORTED_MBC_MMM01;
case 0x0F:
case 0x10:
case 0x11:
case 0x12:
case 0x13: type = type_mbc3; break;
case 0x15:
case 0x16:
case 0x17: return LOADRES_UNSUPPORTED_MBC_MBC4;
case 0x19:
case 0x1A:
case 0x1B:
case 0x1C:
case 0x1D:
case 0x1E: type = type_mbc5; break;
case 0x20: return LOADRES_UNSUPPORTED_MBC_MBC6;
case 0x22: return LOADRES_UNSUPPORTED_MBC_MBC7;
case 0xFC: return LOADRES_UNSUPPORTED_MBC_POCKET_CAMERA;
case 0xFD: return LOADRES_UNSUPPORTED_MBC_TAMA5;
case 0xFE: return LOADRES_UNSUPPORTED_MBC_HUC3;
case 0xFF: type = type_huc1; break;
default: return LOADRES_BAD_FILE_OR_UNKNOWN_MBC;
}
/*switch (header[0x0148]) {
case 0x00: rombanks = 2; break;
case 0x01: rombanks = 4; break;
case 0x02: rombanks = 8; break;
case 0x03: rombanks = 16; break;
case 0x04: rombanks = 32; break;
case 0x05: rombanks = 64; break;
case 0x06: rombanks = 128; break;
case 0x07: rombanks = 256; break;
case 0x08: rombanks = 512; break;
case 0x52: rombanks = 72; break;
case 0x53: rombanks = 80; break;
case 0x54: rombanks = 96; break;
default: return -1;
}*/
rambanks = numRambanksFromH14x(header[0x147], header[0x149]);
cgb = header[0x0143] >> 7 & (1 ^ forceDmg);
}
std::size_t const filesize = rom->size();
rombanks = std::max(pow2ceil(filesize / 0x4000), 2u);
defaultSaveBasePath_.clear();
ggUndoList_.clear();
mbc_.reset();
memptrs_.reset(rombanks, rambanks, cgb ? 8 : 2);
rtc_.set(false, 0);
rom->rewind();
rom->read(reinterpret_cast<char*>(memptrs_.romdata()), filesize / 0x4000 * 0x4000ul);
std::memset(memptrs_.romdata() + filesize / 0x4000 * 0x4000ul,
0xFF,
(rombanks - filesize / 0x4000) * 0x4000ul);
enforce8bit(memptrs_.romdata(), rombanks * 0x4000ul);
if (rom->fail())
return LOADRES_IO_ERROR;
defaultSaveBasePath_ = stripExtension(romfile);
switch (type) {
case type_plain: mbc_.reset(new Mbc0(memptrs_)); break;
case type_mbc1:
if (multicartCompat && presumedMulti64Mbc1(memptrs_.romdata(), rombanks)) {
mbc_.reset(new Mbc1Multi64(memptrs_));
} else
mbc_.reset(new Mbc1(memptrs_));
break;
case type_mbc2: mbc_.reset(new Mbc2(memptrs_)); break;
case type_mbc3:
mbc_.reset(new Mbc3(memptrs_, hasRtc(memptrs_.romdata()[0x147]) ? &rtc_ : 0));
break;
case type_mbc5: mbc_.reset(new Mbc5(memptrs_)); break;
case type_huc1: mbc_.reset(new HuC1(memptrs_)); break;
}
return LOADRES_OK;
}
static bool hasBattery(unsigned char headerByte0x147) {
switch (headerByte0x147) {
case 0x03:
case 0x06:
case 0x09:
case 0x0F:
case 0x10:
case 0x13:
case 0x1B:
case 0x1E:
case 0xFF: return true;
default: return false;
}
}
void Cartridge::loadSavedata() {
std::string const &sbp = saveBasePath();
if (hasBattery(memptrs_.romdata()[0x147])) {
std::ifstream file((sbp + ".sav").c_str(), std::ios::binary | std::ios::in);
if (file.is_open()) {
file.read(reinterpret_cast<char*>(memptrs_.rambankdata()),
memptrs_.rambankdataend() - memptrs_.rambankdata());
enforce8bit(memptrs_.rambankdata(), memptrs_.rambankdataend() - memptrs_.rambankdata());
}
}
if (hasRtc(memptrs_.romdata()[0x147])) {
std::ifstream file((sbp + ".rtc").c_str(), std::ios::binary | std::ios::in);
if (file) {
unsigned long basetime = file.get() & 0xFF;
basetime = basetime << 8 | (file.get() & 0xFF);
basetime = basetime << 8 | (file.get() & 0xFF);
basetime = basetime << 8 | (file.get() & 0xFF);
rtc_.setBaseTime(basetime);
}
}
}
void Cartridge::saveSavedata() {
std::string const &sbp = saveBasePath();
if (hasBattery(memptrs_.romdata()[0x147])) {
std::ofstream file((sbp + ".sav").c_str(), std::ios::binary | std::ios::out);
file.write(reinterpret_cast<char const *>(memptrs_.rambankdata()),
memptrs_.rambankdataend() - memptrs_.rambankdata());
}
if (hasRtc(memptrs_.romdata()[0x147])) {
std::ofstream file((sbp + ".rtc").c_str(), std::ios::binary | std::ios::out);
unsigned long const basetime = rtc_.baseTime();
file.put(basetime >> 24 & 0xFF);
file.put(basetime >> 16 & 0xFF);
file.put(basetime >> 8 & 0xFF);
file.put(basetime & 0xFF);
}
}
static int asHex(char c) {
return c >= 'A' ? c - 'A' + 0xA : c - '0';
}
void Cartridge::applyGameGenie(std::string const &code) {
if (6 < code.length()) {
unsigned const val = (asHex(code[0]) << 4 | asHex(code[1])) & 0xFF;
unsigned const addr = ( asHex(code[2]) << 8
| asHex(code[4]) << 4
| asHex(code[5])
| (asHex(code[6]) ^ 0xF) << 12) & 0x7FFF;
unsigned cmp = 0xFFFF;
if (10 < code.length()) {
cmp = (asHex(code[8]) << 4 | asHex(code[10])) ^ 0xFF;
cmp = ((cmp >> 2 | cmp << 6) ^ 0x45) & 0xFF;
}
for (unsigned bank = 0; bank < std::size_t(memptrs_.romdataend() - memptrs_.romdata()) / 0x4000; ++bank) {
if (mbc_->isAddressWithinAreaRombankCanBeMappedTo(addr, bank)
&& (cmp > 0xFF || memptrs_.romdata()[bank * 0x4000ul + (addr & 0x3FFF)] == cmp)) {
ggUndoList_.push_back(AddrData(bank * 0x4000ul + (addr & 0x3FFF),
memptrs_.romdata()[bank * 0x4000ul + (addr & 0x3FFF)]));
memptrs_.romdata()[bank * 0x4000ul + (addr & 0x3FFF)] = val;
}
}
}
}
void Cartridge::setGameGenie(std::string const &codes) {
if (loaded()) {
for (std::vector<AddrData>::reverse_iterator it =
ggUndoList_.rbegin(), end = ggUndoList_.rend(); it != end; ++it) {
if (memptrs_.romdata() + it->addr < memptrs_.romdataend())
memptrs_.romdata()[it->addr] = it->data;
}
ggUndoList_.clear();
std::string code;
for (std::size_t pos = 0; pos < codes.length(); pos += code.length() + 1) {
code = codes.substr(pos, codes.find(';', pos) - pos);
applyGameGenie(code);
}
}
}
PakInfo const Cartridge::pakInfo(bool const multipakCompat) const {
if (loaded()) {
unsigned const rombs = rombanks(memptrs_);
return PakInfo(multipakCompat && presumedMulti64Mbc1(memptrs_.romdata(), rombs),
rombs,
memptrs_.romdata());
}
return PakInfo();
}
}