def GenerateCheckdigit(basename):
alg = crc_algorithms.Crc(width = 4, poly = 64+2+1, reflect_in=False,
xor_in=0, reflect_out=False, xor_out=0)
crc = alg.bit_by_bit(basename) & ((1<<4)-1) # Calc CRC and limit to 15
letters="ACEFGHJKLMPRTWXN"
crcletter=letters[crc]
return crcletter
def crc_wrap(init, data, hash_width):
data_int = 0
for i in range(len(data)):
data_int |= (data[i]) << (i) * 8
data = int.to_bytes(data_int, len(data), byteorder='little')
crc = ca.Crc(width=16,
poly=0x8d95,
reflect_in=False,
xor_in=init,
reflect_out=False,
xor_out=0x0)
return (crc.bit_by_bit(data) % (2**hash_width))
def filename_for_shortcut(self,name,target): """ Calculates the filename for a given shortcut. This filename is a 64bit integer, where the first 32bits are a CRC32 based off of the name and target (with the added condition that the first bit is always high), and the last 32bits are 0x02000000. """ # This will seem really strange (where I got all of these values), but I # got the xor_in and xor_out from disassembling the steamui library for # OSX. The reflect_in, reflect_out, and poly I figured out via trial and # error. algorithm = crc_algorithms.Crc(width = 32, poly = 0x04C11DB7, reflect_in = True, xor_in = 0xffffffff, reflect_out = True, xor_out = 0xffffffff) input_string = ''.join([target,name]) top_32 = algorithm.bit_by_bit(input_string) | 0x80000000 full_64 = (top_32 << 32) | 0x02000000 return str(full_64)
def generate_appid_for_nonsteam_game(name, target):
"""
(Thanks to github.com/scottrice)
Generates the app ID for a Non-Steam game.
This ID is a 64bit integer, where the first 32bits are
a CRC32 based off of the name and target (with the added
condition that the first bit is always high), and
the last 32bits are 0x02000000.
Paramteters:
name - Game name
target - Exe file location
Returns:
The app ID as a string
"""
algorithm = crc_algorithms.Crc(width = 32, poly = 0x04C11DB7, reflect_in = True, xor_in = 0xffffffff, reflect_out = True, xor_out = 0xffffffff)
input_string = ''.join([target,name])
top_32 = algorithm.bit_by_bit(input_string) | 0x80000000
full_64 = (top_32 << 32) | 0x02000000
return str(full_64)