def parse(data):
if _sub(data, 0x0, 4) != 'NES\x1a':
raise ValueError
if len(data) % 8192 != 16:
name = _sub(data, len(data) - 128, 128).replace('\x00', '')
else:
name = None
num_rom_banks = _unpack(_sub(data, 0x4, 1))
num_vrom_banks = _unpack(_sub(data, 0x5, 1))
rom_size = 16 * num_rom_banks + 8 * num_vrom_banks
num_ram_banks = _unpack(_sub(data, 0x8, 1))
ram_size = 8 * num_ram_banks
return _ROM(name, 'NES', rom_size=rom_size, ram_size=ram_size)
def _deinterleave_smd(data):
block_count = len(data) / 16384
blocks = [
_deinterleave_bytes(_sub(data, i * 16384, 16384))
for i in xrange(block_count)
]
return ''.join(blocks)
def parse(data):
if not _valid_rom_info(data):
if len(data) % 16384 != 0:
# SMD, omit 512B external header and deinterleave first block
data = data[512:]
data = _deinterleave_smd(data)
else:
# MD, deinterleave entire ROM
data = _deinterleave_bytes(data)
if not _valid_rom_info(data):
raise ValueError
name = ' '.join(_sub(data, 0x150, 48).split())
version = _sub(data, 0x182, 12).replace(' ', '')
rom_start = _unpack(_sub(data, 0x1a0, 4))
rom_end = _unpack(_sub(data, 0x1a4, 4))
ram_start = _unpack(_sub(data, 0x1b4, 4))
ram_end = _unpack(_sub(data, 0x1b8, 4))
country = _sub(data, 0x1f0, 16).strip()
return _ROM(name,
'Genesis',
rom_size=(rom_end-rom_start+1)/1024,
ram_size=(ram_end-ram_start+1)/1024,
country=country,
version=version)
def parse(data):
if not _valid_rom_info(data):
if len(data) % 16384 != 0:
# SMD, omit 512B external header and deinterleave first block
data = data[512:]
data = _deinterleave_smd(data)
else:
# MD, deinterleave entire ROM
data = _deinterleave_bytes(data)
if not _valid_rom_info(data):
raise ValueError
name = ' '.join(_sub(data, 0x150, 48).split())
version = _sub(data, 0x182, 12).replace(' ', '')
rom_start = _unpack(_sub(data, 0x1a0, 4))
rom_end = _unpack(_sub(data, 0x1a4, 4))
ram_start = _unpack(_sub(data, 0x1b4, 4))
ram_end = _unpack(_sub(data, 0x1b8, 4))
country = _sub(data, 0x1f0, 16).strip()
return _ROM(name,
'Genesis',
rom_size=(rom_end - rom_start + 1) / 1024,
ram_size=(ram_end - ram_start + 1) / 1024,
country=country,
version=version)
def parse(data):
if _sub(data, 0x0, 4) != 'NES\x1a':
raise ValueError
if len(data) % 8192 != 16:
name = _sub(data, len(data)-128, 128).replace('\x00', '')
else:
name = None
num_rom_banks = _unpack(_sub(data, 0x4, 1))
num_vrom_banks = _unpack(_sub(data, 0x5, 1))
rom_size = 16*num_rom_banks + 8*num_vrom_banks
num_ram_banks = _unpack(_sub(data, 0x8, 1))
ram_size = 8*num_ram_banks
return _ROM(name,
'NES',
rom_size=rom_size,
ram_size=ram_size)
def parse(data):
# omit 512B external header
if len(data) % 32768 != 0:
data = data[512:]
# find 64B internal header address
hdr = _find_header_address(data)
name = _sub(data, hdr, 21).strip()
rom_byte = ord(data[hdr + 0x17])
rom_size = 1 << rom_byte if rom_byte > 0 else 0
ram_byte = ord(data[hdr + 0x18])
ram_size = 1 << ram_byte if ram_byte > 0 else 0
ccode = ord(data[hdr + 0x19])
country, region = _country_and_region(ccode)
version = '1.%d' % ord(data[hdr + 0x1b])
return _ROM(name,
'SNES',
rom_size=rom_size,
ram_size=ram_size,
country=country,
region=region,
version=version)
def parse(data):
# omit 512B external header
if len(data) % 32768 != 0:
data = data[512:]
# find 64B internal header address
hdr = _find_header_address(data)
name = _sub(data, hdr, 21).strip()
rom_byte = ord(data[hdr+0x17])
rom_size = 1 << rom_byte if rom_byte > 0 else 0
ram_byte = ord(data[hdr+0x18])
ram_size = 1 << ram_byte if ram_byte > 0 else 0
ccode = ord(data[hdr+0x19])
country, region = _country_and_region(ccode)
version = '1.%d' % ord(data[hdr+0x1b])
return _ROM(name,
'SNES',
rom_size=rom_size,
ram_size=ram_size,
country=country,
region=region,
version=version)
def _has_lorom_makeup(data, hdr):
l_nibble = _unpack(_sub(data, hdr + 0x15, 1)) & 0xf
return l_nibble % 2 == 0
def _checksum_heuristic(data, hdr):
chksum_cpl = _unpack(_sub(data, hdr + 0x1c, 2))
chksum = _unpack(_sub(data, hdr + 0x1e, 2))
return chksum_cpl ^ chksum == 0xffff
def _valid_rom_info(data):
console = _sub(data, 0x100, 16).strip()
return console == 'SEGA MEGA DRIVE' or console == 'SEGA GENESIS'
def _deinterleave_smd(data):
block_count = len(data) / 16384
blocks = [_deinterleave_bytes(_sub(data, i*16384, 16384)) for i in xrange(block_count)]
return ''.join(blocks)
def _has_lorom_makeup(data, hdr):
l_nibble = _unpack(_sub(data, hdr+0x15, 1)) & 0xf
return l_nibble % 2 == 0
def _checksum_heuristic(data, hdr):
chksum_cpl = _unpack(_sub(data, hdr+0x1c, 2))
chksum = _unpack(_sub(data, hdr+0x1e, 2))
return chksum_cpl ^ chksum == 0xffff
def _valid_rom_info(data):
console = _sub(data, 0x100, 16).strip()
return console == 'SEGA MEGA DRIVE' or console == 'SEGA GENESIS'