crc v0.5.1 CRC
This module is used to calculate CRC (Cyclic Redundancy Check) values for binary data. It uses NIF functions written in C to interate over the given binary calculating the CRC checksum value.
CRC implementations have been tested against these online calculators to validate their correctness to the best of our ability.
https://www.lammertbies.nl/comm/info/crc-calculation.html http://www.sunshine2k.de/coding/javascript/crc/crc_js.html
Summary
Functions
Calculates a 16-bit CCITT CRC with the given seed, seed defaults to 0xFFFF if one is not given
Calculates a 16-bit CCITT 0x1D0F CRC
Calculates a 16-bit CCITT XMODEM CRC
Calculates an XOR checksum for the given binary
Calculates a 16-bit ANSI CRC checksum for the provided binary
Calculates a 16-bit modbus CRC
Calculates a 8-bit CRC with polynomial x^8+x^6+x^3+x^2+1, 0x14D. Chosen based on Koopman, et al. (0xA6 in his notation = 0x14D >> 1): http://www.ece.cmu.edu/~koopman/roses/dsn04/koopman04_crc_poly_embedded.pdf
Initilizes the module by loading NIFs
Functions
Specs
ccitt_16(binary, number) :: numberCalculates a 16-bit CCITT CRC with the given seed, seed defaults to 0xFFFF if one is not given.
This CCIT method uses a 0x1021 polynomial.
Specs
ccitt_16_1D0F(binary) :: numberCalculates a 16-bit CCITT 0x1D0F CRC
This CCIT method uses a 0x1021 polynomial.
Specs
ccitt_16_xmodem(binary) :: numberCalculates a 16-bit CCITT XMODEM CRC
This CCIT method uses a 0x1021 polynomial.
Specs
checksum_xor(binary) :: numberCalculates an XOR checksum for the given binary
Specs
crc_16(binary) :: numberCalculates a 16-bit ANSI CRC checksum for the provided binary
Specs
crc_8(binary, number) :: numberCalculates a 8-bit CRC with polynomial x^8+x^6+x^3+x^2+1, 0x14D. Chosen based on Koopman, et al. (0xA6 in his notation = 0x14D >> 1): http://www.ece.cmu.edu/~koopman/roses/dsn04/koopman04_crc_poly_embedded.pdf
seed defaults to 0xFF if one is not given