qr_code v0.1.0 QRCode.GF256
Galois field(256) https://en.wikipedia.org/wiki/Finite_field https://github.com/komone/qrcode/blob/master/src/gf256.erl
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add(f, a, b)
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divide(f, a, b)
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exponent(g_f256, n)
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field(prime_modulus)
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inverse(f, x)
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log(g_f256, n)
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monomial(g_f256, coeff, degree)
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monomial_product(f, poly, coeff, degree)
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multiply(f, a, b)
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polynomial_product(f, p0, p1)
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subtract(f, a, b)
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