QRCode.GaloisField (QRCode v2.2.1) View Source

Galios Field GF(256) functions.

Link to this section Summary

alpha()

value()

Add two alpha values in GF(256).

Given integer returns alpha exponent. Example

Given alpha exponent returns integer. Example

alpha() :: 0..254

value() :: 1..255

add(alpha(), alpha()) :: alpha()

Add two alpha values in GF(256).

iex> QRCode.GaloisField.add(10, 251)
6

iex> QRCode.GaloisField.add(10, 13)
23

to_a(value()) :: alpha()

Given integer returns alpha exponent. Example:

iex> QRCode.GaloisField.to_a(2)
1

to_i(alpha()) :: value()

Given alpha exponent returns integer. Example:

iex> QRCode.GaloisField.to_i(1)
2