View Source QRCode.GaloisField (QRCode v3.1.0)

Galios Field GF(256) functions.

Summary

alpha()

value()

add(a1, a2)

Add two alpha values in GF(256).

to_a(integer)

Given integer returns alpha exponent. Example

to_i(alpha)

Given alpha exponent returns integer. Example

@type alpha() :: 0..254

@type value() :: 1..255

@spec 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

@spec to_a(value()) :: alpha()

Given integer returns alpha exponent. Example:

iex> QRCode.GaloisField.to_a(2)
1

@spec to_i(alpha()) :: value()

Given alpha exponent returns integer. Example:

iex> QRCode.GaloisField.to_i(1)
2