// The size of a CRC-64 checksum in bytes.
const Size = 8

// Predefined polynomials.
const (
	// The ISO polynomial, defined in ISO 3309 and used in HDLC.
	ISO = 0xD800000000000000

	// The ECMA polynomial, defined in ECMA 182.
	ECMA = 0xC96C5795D7870F42
)

// Table is a 256-word table representing the polynomial for efficient processing.
type Table [256]uint64

var (
	slicing8TablesBuildOnce sync.Once

}

// See
// - https://developer.mozilla.org/en-US/docs/Glossary/Truthy
// - https://stackoverflow.com/questions/19839952/all-falsey-values-in-javascript/19839953#19839953
// - http://www.ecma-international.org/ecma-262/5.1/#sec-9.2
func TestTruthy(t *testing.T) {
	want := true
	for _, key := range []string{
		"someBool", "someString", "someInt", "someFloat", "someArray", "someDate",
		"stringZero", // "0" is truthy

		{"MakeTable", Func, 0},
		{"New", Func, 0},
		{"NewIEEE", Func, 0},
		{"Size", Const, 0},
		{"Table", Type, 0},
		{"Update", Func, 0},
	},
	"hash/crc64": {
		{"Checksum", Func, 0},
		{"ECMA", Const, 0},
		{"ISO", Const, 0},
		{"MakeTable", Func, 0},
		{"New", Func, 0},
		{"Size", Const, 0},
		{"Table", Type, 0},
		{"Update", Func, 0},
	},
	"hash/fnv": {
		{"New128", Func, 9},