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bsnes/supergameboy/nall/snes/info.hpp

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#ifndef NALL_SNES_INFO_HPP
#define NALL_SNES_INFO_HPP
namespace nall {
class snes_information {
public:
string xml_memory_map;
inline snes_information(const uint8_t *data, unsigned size);
private:
inline void read_header(const uint8_t *data, unsigned size);
inline unsigned find_header(const uint8_t *data, unsigned size);
inline unsigned score_header(const uint8_t *data, unsigned size, unsigned addr);
inline unsigned gameboy_ram_size(const uint8_t *data, unsigned size);
inline bool gameboy_has_rtc(const uint8_t *data, unsigned size);
enum HeaderField {
CartName = 0x00,
Mapper = 0x15,
RomType = 0x16,
RomSize = 0x17,
RamSize = 0x18,
CartRegion = 0x19,
Company = 0x1a,
Version = 0x1b,
Complement = 0x1c, //inverse checksum
Checksum = 0x1e,
ResetVector = 0x3c,
};
enum Mode {
ModeNormal,
ModeBsxSlotted,
ModeBsx,
ModeSufamiTurbo,
ModeSuperGameBoy,
};
enum Type {
TypeNormal,
TypeBsxSlotted,
TypeBsxBios,
TypeBsx,
TypeSufamiTurboBios,
TypeSufamiTurbo,
TypeSuperGameBoy1Bios,
TypeSuperGameBoy2Bios,
TypeGameBoy,
TypeUnknown,
};
enum Region {
NTSC,
PAL,
};
enum MemoryMapper {
LoROM,
HiROM,
ExLoROM,
ExHiROM,
SuperFXROM,
SA1ROM,
SPC7110ROM,
BSCLoROM,
BSCHiROM,
BSXROM,
STROM,
};
enum DSP1MemoryMapper {
DSP1Unmapped,
DSP1LoROM1MB,
DSP1LoROM2MB,
DSP1HiROM,
};
bool loaded; //is a base cartridge inserted?
unsigned crc32; //crc32 of all cartridges (base+slot(s))
unsigned rom_size;
unsigned ram_size;
Mode mode;
Type type;
Region region;
MemoryMapper mapper;
DSP1MemoryMapper dsp1_mapper;
bool has_bsx_slot;
bool has_superfx;
bool has_sa1;
bool has_srtc;
bool has_sdd1;
bool has_spc7110;
bool has_spc7110rtc;
bool has_cx4;
bool has_dsp1;
bool has_dsp2;
bool has_dsp3;
bool has_dsp4;
bool has_obc1;
bool has_st010;
bool has_st011;
bool has_st018;
};
snes_information::snes_information(const uint8_t *data, unsigned size) {
read_header(data, size);
string xml = "<?xml version='1.0' encoding='UTF-8'?>\n";
if(type == TypeBsx) {
xml << "<cartridge/>";
xml_memory_map = xml;
return;
}
if(type == TypeSufamiTurbo) {
xml << "<cartridge/>";
xml_memory_map = xml;
return;
}
if(type == TypeGameBoy) {
xml << "<cartridge rtc='" << gameboy_has_rtc(data, size) << "'>\n";
if(gameboy_ram_size(data, size) > 0) {
xml << " <ram size='" << strhex(gameboy_ram_size(data, size)) << "'/>\n";
}
xml << "</cartridge>\n";
xml_memory_map = xml;
return;
}
xml << "<cartridge";
if(region == NTSC) {
xml << " region='NTSC'";
} else {
xml << " region='PAL'";
}
xml << ">\n";
if(type == TypeSuperGameBoy1Bios) {
xml << " <rom>\n";
xml << " <map mode='linear' address='00-7f:8000-ffff'/>\n";
xml << " <map mode='linear' address='80-ff:8000-ffff'/>\n";
xml << " </rom>\n";
xml << " <supergameboy revision='1'>\n";
xml << " <mmio>\n";
xml << " <map address='00-3f:6000-7fff'/>\n";
xml << " <map address='80-bf:6000-7fff'/>\n";
xml << " </mmio>\n";
xml << " </supergameboy>\n";
} else if(type == TypeSuperGameBoy2Bios) {
xml << " <rom>\n";
xml << " <map mode='linear' address='00-7f:8000-ffff'/>\n";
xml << " <map mode='linear' address='80-ff:8000-ffff'/>\n";
xml << " </rom>\n";
xml << " <supergameboy revision='2'>\n";
xml << " <mmio>\n";
xml << " <map address='00-3f:6000-7fff'/>\n";
xml << " <map address='80-bf:6000-7fff'/>\n";
xml << " </mmio>\n";
xml << " </supergameboy>\n";
} else if(has_spc7110) {
xml << " <rom>\n";
xml << " <map mode='shadow' address='00-0f:8000-ffff'/>\n";
xml << " <map mode='shadow' address='80-bf:8000-ffff'/>\n";
xml << " <map mode='linear' address='c0-cf:0000-ffff'/>\n";
xml << " </rom>\n";
xml << " <spc7110>\n";
xml << " <mcu>\n";
xml << " <map address='d0-ff:0000-ffff' offset='100000' size='" << strhex(size - 0x100000) << "'/>\n";
xml << " </mcu>\n";
xml << " <ram size='" << strhex(ram_size) << "'>\n";
xml << " <map mode='linear' address='00:6000-7fff'/>\n";
xml << " <map mode='linear' address='30:6000-7fff'/>\n";
xml << " </ram>\n";
xml << " <mmio>\n";
xml << " <map address='00-3f:4800-483f'/>\n";
xml << " <map address='80-bf:4800-483f'/>\n";
xml << " </mmio>\n";
if(has_spc7110rtc) {
xml << " <rtc>\n";
xml << " <map address='00-3f:4840-4842'/>\n";
xml << " <map address='80-bf:4840-4842'/>\n";
xml << " </rtc>\n";
}
xml << " <dcu>\n";
xml << " <map address='50:0000-ffff'/>\n";
xml << " </dcu>\n";
xml << " </spc7110>\n";
} else if(mapper == LoROM) {
xml << " <rom>\n";
xml << " <map mode='linear' address='00-7f:8000-ffff'/>\n";
xml << " <map mode='linear' address='80-ff:8000-ffff'/>\n";
xml << " </rom>\n";
if(ram_size > 0) {
xml << " <ram size='" << strhex(ram_size) << "'>\n";
xml << " <map mode='linear' address='20-3f:6000-7fff'/>\n";
xml << " <map mode='linear' address='a0-bf:6000-7fff'/>\n";
if((rom_size > 0x200000) || (ram_size > 32 * 1024)) {
xml << " <map mode='linear' address='70-7f:0000-7fff'/>\n";
xml << " <map mode='linear' address='f0-ff:0000-7fff'/>\n";
} else {
xml << " <map mode='linear' address='70-7f:0000-ffff'/>\n";
xml << " <map mode='linear' address='f0-ff:0000-ffff'/>\n";
}
xml << " </ram>\n";
}
} else if(mapper == HiROM) {
xml << " <rom>\n";
xml << " <map mode='shadow' address='00-3f:8000-ffff'/>\n";
xml << " <map mode='linear' address='40-7f:0000-ffff'/>\n";
xml << " <map mode='shadow' address='80-bf:8000-ffff'/>\n";
xml << " <map mode='linear' address='c0-ff:0000-ffff'/>\n";
xml << " </rom>\n";
if(ram_size > 0) {
xml << " <ram size='" << strhex(ram_size) << "'>\n";
xml << " <map mode='linear' address='20-3f:6000-7fff'/>\n";
xml << " <map mode='linear' address='a0-bf:6000-7fff'/>\n";
if((rom_size > 0x200000) || (ram_size > 32 * 1024)) {
xml << " <map mode='linear' address='70-7f:0000-7fff'/>\n";
} else {
xml << " <map mode='linear' address='70-7f:0000-ffff'/>\n";
}
xml << " </ram>\n";
}
} else if(mapper == ExLoROM) {
xml << " <rom>\n";
xml << " <map mode='linear' address='00-3f:8000-ffff'/>\n";
xml << " <map mode='linear' address='40-7f:0000-ffff'/>\n";
xml << " <map mode='linear' address='80-bf:8000-ffff'/>\n";
xml << " </rom>\n";
if(ram_size > 0) {
xml << " <ram size='" << strhex(ram_size) << "'>\n";
xml << " <map mode='linear' address='20-3f:6000-7fff'/>\n";
xml << " <map mode='linear' address='a0-bf:6000-7fff'/>\n";
xml << " <map mode='linear' address='70-7f:0000-7fff'/>\n";
xml << " </ram>\n";
}
} else if(mapper == ExHiROM) {
xml << " <rom>\n";
xml << " <map mode='shadow' address='00-3f:8000-ffff' offset='400000'/>\n";
xml << " <map mode='linear' address='40-7f:0000-ffff' offset='400000'/>\n";
xml << " <map mode='shadow' address='80-bf:8000-ffff' offset='000000'/>\n";
xml << " <map mode='linear' address='c0-ff:0000-ffff' offset='000000'/>\n";
xml << " </rom>\n";
if(ram_size > 0) {
xml << " <ram size='" << strhex(ram_size) << "'>\n";
xml << " <map mode='linear' address='20-3f:6000-7fff'/>\n";
xml << " <map mode='linear' address='a0-bf:6000-7fff'/>\n";
if((rom_size > 0x200000) || (ram_size > 32 * 1024)) {
xml << " <map mode='linear' address='70-7f:0000-7fff'/>\n";
} else {
xml << " <map mode='linear' address='70-7f:0000-ffff'/>\n";
}
xml << " </ram>\n";
}
} else if(mapper == SuperFXROM) {
xml << " <superfx revision='2'>\n";
xml << " <rom>\n";
xml << " <map mode='linear' address='00-3f:8000-ffff'/>\n";
xml << " <map mode='linear' address='40-5f:0000-ffff'/>\n";
xml << " <map mode='linear' address='80-bf:8000-ffff'/>\n";
xml << " <map mode='linear' address='c0-df:0000-ffff'/>\n";
xml << " </rom>\n";
xml << " <ram size='" << strhex(ram_size) << "'>\n";
xml << " <map mode='linear' address='00-3f:6000-7fff' size='2000'/>\n";
xml << " <map mode='linear' address='60-7f:0000-ffff'/>\n";
xml << " <map mode='linear' address='80-bf:6000-7fff' size='2000'/>\n";
xml << " <map mode='linear' address='e0-ff:0000-ffff'/>\n";
xml << " </ram>\n";
xml << " <mmio>\n";
xml << " <map address='00-3f:3000-32ff'/>\n";
xml << " <map address='80-bf:3000-32ff'/>\n";
xml << " </mmio>\n";
xml << " </superfx>\n";
} else if(mapper == SA1ROM) {
xml << " <sa1>\n";
xml << " <rom>\n";
xml << " <map mode='linear' address='00-3f:8000-ffff'/>\n";
xml << " <map mode='linear' address='80-bf:8000-ffff'/>\n";
xml << " <map mode='linear' address='c0-ff:0000-ffff'/>\n";
xml << " </rom>\n";
xml << " <iram size='800'>\n";
xml << " <map mode='linear' address='00-3f:3000-37ff'/>\n";
xml << " <map mode='linear' address='80-bf:3000-37ff'/>\n";
xml << " </iram>\n";
xml << " <bwram size='" << strhex(ram_size) << "'>\n";
xml << " <map mode='linear' address='00-3f:6000-7fff'/>\n";
xml << " <map mode='linear' address='40-4f:0000-ffff'/>\n";
xml << " <map mode='linear' address='80-bf:6000-7fff'/>\n";
xml << " </bwram>\n";
xml << " <mmio>\n";
xml << " <map address='00-3f:2200-23ff'/>\n";
xml << " <map address='80-bf:2200-23ff'/>\n";
xml << " </mmio>\n";
xml << " </sa1>\n";
} else if(mapper == BSCLoROM) {
xml << " <rom>\n";
xml << " <map mode='linear' address='00-1f:8000-ffff' offset='000000'/>\n";
xml << " <map mode='linear' address='20-3f:8000-ffff' offset='100000'/>\n";
xml << " <map mode='linear' address='80-9f:8000-ffff' offset='200000'/>\n";
xml << " <map mode='linear' address='a0-bf:8000-ffff' offset='100000'/>\n";
xml << " </rom>\n";
xml << " <ram size='" << strhex(ram_size) << "'>\n";
xml << " <map mode='linear' address='70-7f:0000-7fff'/>\n";
xml << " <map mode='linear' address='f0-ff:0000-7fff'/>\n";
xml << " </ram>\n";
xml << " <bsx>\n";
xml << " <slot>\n";
xml << " <map mode='linear' address='c0-ef:0000-ffff'/>\n";
xml << " </slot>\n";
xml << " </bsx>\n";
} else if(mapper == BSCHiROM) {
xml << " <rom>\n";
xml << " <map mode='shadow' address='00-1f:8000-ffff'/>\n";
xml << " <map mode='linear' address='40-5f:0000-ffff'/>\n";
xml << " <map mode='shadow' address='80-9f:8000-ffff'/>\n";
xml << " <map mode='linear' address='c0-df:0000-ffff'/>\n";
xml << " </rom>\n";
xml << " <ram size='" << strhex(ram_size) << "'>\n";
xml << " <map mode='linear' address='20-3f:6000-7fff'/>\n";
xml << " <map mode='linear' address='a0-bf:6000-7fff'/>\n";
xml << " </ram>\n";
xml << " <bsx>\n";
xml << " <slot>\n";
xml << " <map mode='shadow' address='20-3f:8000-ffff'/>\n";
xml << " <map mode='linear' address='60-7f:0000-ffff'/>\n";
xml << " <map mode='shadow' address='a0-bf:8000-ffff'/>\n";
xml << " <map mode='linear' address='e0-ff:0000-ffff'/>\n";
xml << " </slot>\n";
xml << " </bsx>\n";
} else if(mapper == BSXROM) {
xml << " <rom>\n";
xml << " <map mode='linear' address='00-3f:8000-ffff'/>\n";
xml << " <map mode='linear' address='80-bf:8000-ffff'/>\n";
xml << " </rom>\n";
xml << " <bsx>\n";
xml << " <mmio>\n";
xml << " <map address='00-3f:5000-5fff'/>\n";
xml << " <map address='80-bf:5000-5fff'/>\n";
xml << " </mmio>\n";
xml << " </bsx>\n";
} else if(mapper == STROM) {
xml << " <rom>\n";
xml << " <map mode='linear' address='00-1f:8000-ffff'/>\n";
xml << " <map mode='linear' address='80-9f:8000-ffff'/>\n";
xml << " </rom>\n";
xml << " <sufamiturbo>\n";
xml << " <slot id='A'>\n";
xml << " <rom>\n";
xml << " <map mode='linear' address='20-3f:8000-ffff'/>\n";
xml << " <map mode='linear' address='a0-bf:8000-ffff'/>\n";
xml << " </rom>\n";
xml << " <ram>\n";
xml << " <map mode='linear' address='60-63:8000-ffff'/>\n";
xml << " <map mode='linear' address='e0-e3:8000-ffff'/>\n";
xml << " </ram>\n";
xml << " </slot>\n";
xml << " <slot id='B'>\n";
xml << " <rom>\n";
xml << " <map mode='linear' address='40-5f:8000-ffff'/>\n";
xml << " <map mode='linear' address='c0-df:8000-ffff'/>\n";
xml << " </rom>\n";
xml << " <ram>\n";
xml << " <map mode='linear' address='70-73:8000-ffff'/>\n";
xml << " <map mode='linear' address='f0-f3:8000-ffff'/>\n";
xml << " </ram>\n";
xml << " </slot>\n";
xml << " </sufamiturbo>\n";
}
if(has_srtc) {
xml << " <srtc>\n";
xml << " <mmio>\n";
xml << " <map address='00-3f:2800-2801'/>\n";
xml << " <map address='80-bf:2800-2801'/>\n";
xml << " </mmio>\n";
xml << " </srtc>\n";
}
if(has_sdd1) {
xml << " <sdd1>\n";
xml << " <mcu>\n";
xml << " <map address='c0-ff:0000-ffff'/>\n";
xml << " </mcu>\n";
xml << " <mmio>\n";
xml << " <map address='00-3f:4800-4807'/>\n";
xml << " <map address='80-bf:4800-4807'/>\n";
xml << " </mmio>\n";
xml << " </sdd1>\n";
}
if(has_cx4) {
xml << " <cx4>\n";
xml << " <mmio>\n";
xml << " <map address='00-3f:6000-7fff'/>\n";
xml << " <map address='80-bf:6000-7fff'/>\n";
xml << " </mmio>\n";
xml << " </cx4>\n";
}
if(has_dsp1) {
xml << " <necdsp program='DSP-1B'>\n";
if(dsp1_mapper == DSP1LoROM1MB) {
xml << " <dr>\n";
xml << " <map address='20-3f:8000-bfff'/>\n";
xml << " <map address='a0-bf:8000-bfff'/>\n";
xml << " </dr>\n";
xml << " <sr>\n";
xml << " <map address='20-3f:c000-ffff'/>\n";
xml << " <map address='a0-bf:c000-ffff'/>\n";
xml << " </sr>\n";
} else if(dsp1_mapper == DSP1LoROM2MB) {
xml << " <dr>\n";
xml << " <map address='60-6f:0000-3fff'/>\n";
xml << " <map address='e0-ef:0000-3fff'/>\n";
xml << " </dr>\n";
xml << " <sr>\n";
xml << " <map address='60-6f:4000-7fff'/>\n";
xml << " <map address='e0-ef:4000-7fff'/>\n";
xml << " </sr>\n";
} else if(dsp1_mapper == DSP1HiROM) {
xml << " <dr>\n";
xml << " <map address='00-1f:6000-6fff'/>\n";
xml << " <map address='80-9f:6000-6fff'/>\n";
xml << " </dr>\n";
xml << " <sr>\n";
xml << " <map address='00-1f:7000-7fff'/>\n";
xml << " <map address='80-9f:7000-7fff'/>\n";
xml << " </sr>\n";
}
xml << " </necdsp>\n";
}
if(has_dsp2) {
xml << " <necdsp program='DSP-2'>\n";
xml << " <dr>\n";
xml << " <map address='20-3f:8000-bfff'/>\n";
xml << " <map address='a0-bf:8000-bfff'/>\n";
xml << " </dr>\n";
xml << " <sr>\n";
xml << " <map address='20-3f:c000-ffff'/>\n";
xml << " <map address='a0-bf:c000-ffff'/>\n";
xml << " </sr>\n";
xml << " </necdsp>\n";
}
if(has_dsp3) {
xml << " <necdsp program='DSP-3'>\n";
xml << " <dr>\n";
xml << " <map address='20-3f:8000-bfff'/>\n";
xml << " <map address='a0-bf:8000-bfff'/>\n";
xml << " </dr>\n";
xml << " <sr>\n";
xml << " <map address='20-3f:c000-ffff'/>\n";
xml << " <map address='a0-bf:c000-ffff'/>\n";
xml << " </sr>\n";
xml << " </necdsp>\n";
}
if(has_dsp4) {
xml << " <necdsp program='DSP-4'>\n";
xml << " <dr>\n";
xml << " <map address='30-3f:8000-bfff'/>\n";
xml << " <map address='b0-bf:8000-bfff'/>\n";
xml << " </dr>\n";
xml << " <sr>\n";
xml << " <map address='30-3f:c000-ffff'/>\n";
xml << " <map address='b0-bf:c000-ffff'/>\n";
xml << " </sr>\n";
xml << " </necdsp>\n";
}
if(has_obc1) {
xml << " <obc1>\n";
xml << " <mmio>\n";
xml << " <map address='00-3f:6000-7fff'/>\n";
xml << " <map address='80-bf:6000-7fff'/>\n";
xml << " </mmio>\n";
xml << " </obc1>\n";
}
if(has_st010) {
xml << " <setadsp program='ST-0010'>\n";
xml << " <mmio>\n";
xml << " <map address='68-6f:0000-0fff'/>\n";
xml << " <map address='e8-ef:0000-0fff'/>\n";
xml << " </mmio>\n";
xml << " </setadsp>\n";
}
if(has_st011) {
//ST-0011 addresses not verified; chip is unsupported
xml << " <setadsp program='ST-0011'>\n";
xml << " <mmio>\n";
xml << " <map address='68-6f:0000-0fff'/>\n";
xml << " <map address='e8-ef:0000-0fff'/>\n";
xml << " </mmio>\n";
xml << " </setadsp>\n";
}
if(has_st018) {
xml << " <setarisc program='ST-0018'>\n";
xml << " <mmio>\n";
xml << " <map address='00-3f:3800-38ff'/>\n";
xml << " <map address='80-bf:3800-38ff'/>\n";
xml << " </mmio>\n";
xml << " </setarisc>\n";
}
xml << "</cartridge>\n";
xml_memory_map = xml;
}
void snes_information::read_header(const uint8_t *data, unsigned size) {
type = TypeUnknown;
mapper = LoROM;
dsp1_mapper = DSP1Unmapped;
region = NTSC;
rom_size = size;
ram_size = 0;
has_bsx_slot = false;
has_superfx = false;
has_sa1 = false;
has_srtc = false;
has_sdd1 = false;
has_spc7110 = false;
has_spc7110rtc = false;
has_cx4 = false;
has_dsp1 = false;
has_dsp2 = false;
has_dsp3 = false;
has_dsp4 = false;
has_obc1 = false;
has_st010 = false;
has_st011 = false;
has_st018 = false;
//=====================
//detect Game Boy carts
//=====================
if(size >= 0x0140) {
if(data[0x0104] == 0xce && data[0x0105] == 0xed && data[0x0106] == 0x66 && data[0x0107] == 0x66
&& data[0x0108] == 0xcc && data[0x0109] == 0x0d && data[0x010a] == 0x00 && data[0x010b] == 0x0b) {
type = TypeGameBoy;
return;
}
}
const unsigned index = find_header(data, size);
const uint8_t mapperid = data[index + Mapper];
const uint8_t rom_type = data[index + RomType];
const uint8_t rom_size = data[index + RomSize];
const uint8_t company = data[index + Company];
const uint8_t regionid = data[index + CartRegion] & 0x7f;
ram_size = 1024 << (data[index + RamSize] & 7);
if(ram_size == 1024) ram_size = 0; //no RAM present
//0, 1, 13 = NTSC; 2 - 12 = PAL
region = (regionid <= 1 || regionid >= 13) ? NTSC : PAL;
//=======================
//detect BS-X flash carts
//=======================
if(data[index + 0x13] == 0x00 || data[index + 0x13] == 0xff) {
if(data[index + 0x14] == 0x00) {
const uint8_t n15 = data[index + 0x15];
if(n15 == 0x00 || n15 == 0x80 || n15 == 0x84 || n15 == 0x9c || n15 == 0xbc || n15 == 0xfc) {
if(data[index + 0x1a] == 0x33 || data[index + 0x1a] == 0xff) {
type = TypeBsx;
mapper = BSXROM;
region = NTSC; //BS-X only released in Japan
return;
}
}
}
}
//=========================
//detect Sufami Turbo carts
//=========================
if(!memcmp(data, "BANDAI SFC-ADX", 14)) {
if(!memcmp(data + 16, "SFC-ADX BACKUP", 14)) {
type = TypeSufamiTurboBios;
} else {
type = TypeSufamiTurbo;
}
mapper = STROM;
region = NTSC; //Sufami Turbo only released in Japan
return; //RAM size handled outside this routine
}
//==========================
//detect Super Game Boy BIOS
//==========================
if(!memcmp(data + index, "Super GAMEBOY2", 14)) {
type = TypeSuperGameBoy2Bios;
return;
}
if(!memcmp(data + index, "Super GAMEBOY", 13)) {
type = TypeSuperGameBoy1Bios;
return;
}
//=====================
//detect standard carts
//=====================
//detect presence of BS-X flash cartridge connector (reads extended header information)
if(data[index - 14] == 'Z') {
if(data[index - 11] == 'J') {
uint8_t n13 = data[index - 13];
if((n13 >= 'A' && n13 <= 'Z') || (n13 >= '0' && n13 <= '9')) {
if(company == 0x33 || (data[index - 10] == 0x00 && data[index - 4] == 0x00)) {
has_bsx_slot = true;
}
}
}
}
if(has_bsx_slot) {
if(!memcmp(data + index, "Satellaview BS-X ", 21)) {
//BS-X base cart
type = TypeBsxBios;
mapper = BSXROM;
region = NTSC; //BS-X only released in Japan
return; //RAM size handled internally by load_cart_bsx() -> BSXCart class
} else {
type = TypeBsxSlotted;
mapper = (index == 0x7fc0 ? BSCLoROM : BSCHiROM);
region = NTSC; //BS-X slotted cartridges only released in Japan
}
} else {
//standard cart
type = TypeNormal;
if(index == 0x7fc0 && size >= 0x401000) {
mapper = ExLoROM;
} else if(index == 0x7fc0 && mapperid == 0x32) {
mapper = ExLoROM;
} else if(index == 0x7fc0) {
mapper = LoROM;
} else if(index == 0xffc0) {
mapper = HiROM;
} else { //index == 0x40ffc0
mapper = ExHiROM;
}
}
if(mapperid == 0x20 && (rom_type == 0x13 || rom_type == 0x14 || rom_type == 0x15 || rom_type == 0x1a)) {
has_superfx = true;
mapper = SuperFXROM;
ram_size = 1024 << (data[index - 3] & 7);
if(ram_size == 1024) ram_size = 0;
}
if(mapperid == 0x23 && (rom_type == 0x32 || rom_type == 0x34 || rom_type == 0x35)) {
has_sa1 = true;
mapper = SA1ROM;
}
if(mapperid == 0x35 && rom_type == 0x55) {
has_srtc = true;
}
if(mapperid == 0x32 && (rom_type == 0x43 || rom_type == 0x45)) {
has_sdd1 = true;
}
if(mapperid == 0x3a && (rom_type == 0xf5 || rom_type == 0xf9)) {
has_spc7110 = true;
has_spc7110rtc = (rom_type == 0xf9);
mapper = SPC7110ROM;
}
if(mapperid == 0x20 && rom_type == 0xf3) {
has_cx4 = true;
}
if((mapperid == 0x20 || mapperid == 0x21) && rom_type == 0x03) {
has_dsp1 = true;
}
if(mapperid == 0x30 && rom_type == 0x05 && company != 0xb2) {
has_dsp1 = true;
}
if(mapperid == 0x31 && (rom_type == 0x03 || rom_type == 0x05)) {
has_dsp1 = true;
}
if(has_dsp1 == true) {
if((mapperid & 0x2f) == 0x20 && size <= 0x100000) {
dsp1_mapper = DSP1LoROM1MB;
} else if((mapperid & 0x2f) == 0x20) {
dsp1_mapper = DSP1LoROM2MB;
} else if((mapperid & 0x2f) == 0x21) {
dsp1_mapper = DSP1HiROM;
}
}
if(mapperid == 0x20 && rom_type == 0x05) {
has_dsp2 = true;
}
if(mapperid == 0x30 && rom_type == 0x05 && company == 0xb2) {
has_dsp3 = true;
}
if(mapperid == 0x30 && rom_type == 0x03) {
has_dsp4 = true;
}
if(mapperid == 0x30 && rom_type == 0x25) {
has_obc1 = true;
}
if(mapperid == 0x30 && rom_type == 0xf6 && rom_size >= 10) {
has_st010 = true;
}
if(mapperid == 0x30 && rom_type == 0xf6 && rom_size < 10) {
has_st011 = true;
}
if(mapperid == 0x30 && rom_type == 0xf5) {
has_st018 = true;
}
}
unsigned snes_information::find_header(const uint8_t *data, unsigned size) {
unsigned score_lo = score_header(data, size, 0x007fc0);
unsigned score_hi = score_header(data, size, 0x00ffc0);
unsigned score_ex = score_header(data, size, 0x40ffc0);
if(score_ex) score_ex += 4; //favor ExHiROM on images > 32mbits
if(score_lo >= score_hi && score_lo >= score_ex) {
return 0x007fc0;
} else if(score_hi >= score_ex) {
return 0x00ffc0;
} else {
return 0x40ffc0;
}
}
unsigned snes_information::score_header(const uint8_t *data, unsigned size, unsigned addr) {
if(size < addr + 64) return 0; //image too small to contain header at this location?
int score = 0;
uint16_t resetvector = data[addr + ResetVector] | (data[addr + ResetVector + 1] << 8);
uint16_t checksum = data[addr + Checksum ] | (data[addr + Checksum + 1] << 8);
uint16_t complement = data[addr + Complement ] | (data[addr + Complement + 1] << 8);
uint8_t resetop = data[(addr & ~0x7fff) | (resetvector & 0x7fff)]; //first opcode executed upon reset
uint8_t mapper = data[addr + Mapper] & ~0x10; //mask off irrelevent FastROM-capable bit
//$00:[000-7fff] contains uninitialized RAM and MMIO.
//reset vector must point to ROM at $00:[8000-ffff] to be considered valid.
if(resetvector < 0x8000) return 0;
//some images duplicate the header in multiple locations, and others have completely
//invalid header information that cannot be relied upon.
//below code will analyze the first opcode executed at the specified reset vector to
//determine the probability that this is the correct header.
//most likely opcodes
if(resetop == 0x78 //sei
|| resetop == 0x18 //clc (clc; xce)
|| resetop == 0x38 //sec (sec; xce)
|| resetop == 0x9c //stz $nnnn (stz $4200)
|| resetop == 0x4c //jmp $nnnn
|| resetop == 0x5c //jml $nnnnnn
) score += 8;
//plausible opcodes
if(resetop == 0xc2 //rep #$nn
|| resetop == 0xe2 //sep #$nn
|| resetop == 0xad //lda $nnnn
|| resetop == 0xae //ldx $nnnn
|| resetop == 0xac //ldy $nnnn
|| resetop == 0xaf //lda $nnnnnn
|| resetop == 0xa9 //lda #$nn
|| resetop == 0xa2 //ldx #$nn
|| resetop == 0xa0 //ldy #$nn
|| resetop == 0x20 //jsr $nnnn
|| resetop == 0x22 //jsl $nnnnnn
) score += 4;
//implausible opcodes
if(resetop == 0x40 //rti
|| resetop == 0x60 //rts
|| resetop == 0x6b //rtl
|| resetop == 0xcd //cmp $nnnn
|| resetop == 0xec //cpx $nnnn
|| resetop == 0xcc //cpy $nnnn
) score -= 4;
//least likely opcodes
if(resetop == 0x00 //brk #$nn
|| resetop == 0x02 //cop #$nn
|| resetop == 0xdb //stp
|| resetop == 0x42 //wdm
|| resetop == 0xff //sbc $nnnnnn,x
) score -= 8;
//at times, both the header and reset vector's first opcode will match ...
//fallback and rely on info validity in these cases to determine more likely header.
//a valid checksum is the biggest indicator of a valid header.
if((checksum + complement) == 0xffff && (checksum != 0) && (complement != 0)) score += 4;
if(addr == 0x007fc0 && mapper == 0x20) score += 2; //0x20 is usually LoROM
if(addr == 0x00ffc0 && mapper == 0x21) score += 2; //0x21 is usually HiROM
if(addr == 0x007fc0 && mapper == 0x22) score += 2; //0x22 is usually ExLoROM
if(addr == 0x40ffc0 && mapper == 0x25) score += 2; //0x25 is usually ExHiROM
if(data[addr + Company] == 0x33) score += 2; //0x33 indicates extended header
if(data[addr + RomType] < 0x08) score++;
if(data[addr + RomSize] < 0x10) score++;
if(data[addr + RamSize] < 0x08) score++;
if(data[addr + CartRegion] < 14) score++;
if(score < 0) score = 0;
return score;
}
unsigned snes_information::gameboy_ram_size(const uint8_t *data, unsigned size) {
if(size < 512) return 0;
switch(data[0x0149]) {
case 0x00: return 0 * 1024;
case 0x01: return 8 * 1024;
case 0x02: return 8 * 1024;
case 0x03: return 32 * 1024;
case 0x04: return 128 * 1024;
case 0x05: return 128 * 1024;
default: return 128 * 1024;
}
}
bool snes_information::gameboy_has_rtc(const uint8_t *data, unsigned size) {
if(size < 512) return false;
if(data[0x0147] == 0x0f ||data[0x0147] == 0x10) return true;
return false;
}
}
#endif
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