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#-----------------------------------------------------------------------------
# Demonstrate the use of the code generator
from crcmod import Crc
g8 = 0x185
g16 = 0x11021
g24 = 0x15D6DCB
g32 = 0x104C11DB7
def polyFromBits(bits):
p = 0
for n in bits:
p = p | (1 << n)
return p
# The following is from Standard ECMA-182 "Data Interchange on 12,7 mm 48-Track
# Magnetic Tape Cartridges -DLT1 Format-", December 1992.
g64 = polyFromBits([64, 62, 57, 55, 54, 53, 52, 47, 46, 45, 40, 39, 38, 37,
35, 33, 32, 31, 29, 27, 24, 23, 22, 21, 19, 17, 13, 12, 10, 9, 7,
4, 1, 0])
print('Generating examples.c')
out = open('examples.c', 'w')
out.write('''// Define the required data types
typedef unsigned char UINT8;
typedef unsigned short UINT16;
typedef unsigned int UINT32;
typedef unsigned long long UINT64;
''')
Crc(g8, rev=False).generateCode('crc8',out)
Crc(g8, rev=True).generateCode('crc8r',out)
Crc(g16, rev=False).generateCode('crc16',out)
Crc(g16, rev=True).generateCode('crc16r',out)
Crc(g24, rev=False).generateCode('crc24',out)
Crc(g24, rev=True).generateCode('crc24r',out)
Crc(g32, rev=False).generateCode('crc32',out)
Crc(g32, rev=True).generateCode('crc32r',out)
Crc(g64, rev=False).generateCode('crc64',out)
Crc(g64, rev=True).generateCode('crc64r',out)
# Check out the XOR-out feature.
Crc(g16, initCrc=0, rev=True, xorOut=~0).generateCode('crc16x',out)
Crc(g24, initCrc=0, rev=True, xorOut=~0).generateCode('crc24x',out)
Crc(g32, initCrc=0, rev=True, xorOut=~0).generateCode('crc32x',out)
Crc(g64, initCrc=0, rev=True, xorOut=~0).generateCode('crc64x',out)
out.close()
print('Done')