// table (8*256*4 bytes).

package crc32

import "internal/byteorder"

// simpleMakeTable allocates and constructs a Table for the specified
// polynomial. The table is suitable for use with the simple algorithm
// (simpleUpdate).
func simpleMakeTable(poly uint32) *Table {
	t := new(Table)
	simplePopulateTable(poly, t)
	return t
}

var castagnoliTable8 *slicing8Table
var updateCastagnoli func(crc uint32, p []byte) uint32
var castagnoliOnce sync.Once
var haveCastagnoli atomic.Bool

func castagnoliInit() {
	castagnoliTable = simpleMakeTable(Castagnoli)

	if archAvailableCastagnoli() {
		archInitCastagnoli()
		updateCastagnoli = archUpdateCastagnoli
	} else {
		// Initialize the slicing-by-8 table.
		castagnoliTable8 = slicingMakeTable(Castagnoli)

		}
	}
}

// TestSimple tests the simple generic algorithm.
func TestSimple(t *testing.T) {
	tab := simpleMakeTable(IEEE)
	testGoldenIEEE(t, func(b []byte) uint32 {
		return simpleUpdate(0, tab, b)
	})

	tab = simpleMakeTable(Castagnoli)
	testGoldenCastagnoli(t, func(b []byte) uint32 {
		return simpleUpdate(0, tab, b)
	})
}

func TestGoldenMarshal(t *testing.T) {