Commit 4d3ca449 authored by Jakob Haufe's avatar Jakob Haufe Committed by Rahix
Browse files

fix(crc-patch): Autodetect Python crc16 implementation

There are several common CRC implementations for Python with the currently
used one (crc16) not being available in e.g. Debian.

crcmod and/or crcelk are readily available on several distributions.
parent cef43dde
#!/usr/bin/env python3
import sys
import crc16
import crc16
crcfun = crc16.crc16xmodem
except ImportError:
import crcmod
crcfun = crcmod.predefined.mkCrcFun("xmodem")
except ImportError:
import crcelk
crcfun = crcelk.CRC_XMODEM.calc_bytes
except ImportError:
raise Exception(
"Could not find a CRC implementation. Tried: crc16, crcmod, crcelk."
def main():
data = open(sys.argv[1], 'rb').read()
crc = crc16.crc16xmodem(data)
data = open(sys.argv[1], "rb").read()
crc = crcfun(data)
# print(crc)
padded = data + bytes([crc >> 8, crc & 0xFF])
crc = crc16.crc16xmodem(padded)
crc = crcfun(padded)
# print(crc)
open(sys.argv[1], 'wb').write(padded)
open(sys.argv[1], "wb").write(padded)
if __name__ == "__main__":
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