func verifyIsAffine(t *testing.T, aff encoding.Byte, err string) {
m, c := DecomposeAffineEncoding(aff)
test := encoding.ByteAffine{encoding.ByteLinear(m), c}
for i := 0; i < 256; i++ {
a, b := aff.Encode(byte(i)), test.Encode(byte(i))
if a != b {
t.Fatalf(err, i, a, b)
}
}
}
// isAffine returns true if the given encoding is affine and false if not.
func isAffine(aff encoding.Byte) bool {
m, c := DecomposeAffineEncoding(aff)
test := encoding.ByteAffine{encoding.ByteLinear(m), c}
for i := 0; i < 256; i++ {
a, b := aff.Encode(byte(i)), test.Encode(byte(i))
if a != b {
return false
}
}
return true
}