Update CRC Value

v = crc.crc8_update(v, txt)
v = crc.crc16_update(v, txt)
v = crc.crc32_update(v, txt)
v = crc.crcxmodem_update(v, txt)

Update the CRC v with txt.

v = crc.crc8_update(v, v1, v2, ...)
v = crc.crc16_update(v, v1, v2, ...)
v = crc.crc32_update(v, v1, v2, ...)
v = crc.crcxmodem_update(v, v1, v2, ...)

Update the CRC v with values v1, v2, etc. (from 1 to n values)

Allows CRC calculations on chunks of data.

See: crc.crc8_init, crc16_init, crc32_init, crcxmodem_init
See: crc.crc8_finish, crc16_finish, crc32_finish, crcxmodem_finish