| #----------------------------------------------------------------------------- |
| # 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') |
