1// Copyright 2015 The Go Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style
3// license that can be found in the LICENSE file.
4
5// +build ignore
6
7package crc32_test
8
9import (
10	"fmt"
11	"hash/crc32"
12)
13
14func ExampleMakeTable() {
15	// In this package, the CRC polynomial is represented in reversed notation,
16	// or LSB-first representation.
17	//
18	// LSB-first representation is a hexadecimal number with n bits, in which the
19	// most significant bit represents the coefficient of x⁰ and the least significant
20	// bit represents the coefficient of xⁿ⁻¹ (the coefficient for xⁿ is implicit).
21	//
22	// For example, CRC32-Q, as defined by the following polynomial,
23	//	x³²+ x³¹+ x²⁴+ x²²+ x¹⁶+ x¹⁴+ x⁸+ x⁷+ x⁵+ x³+ x¹+ x⁰
24	// has the reversed notation 0b11010101100000101000001010000001, so the value
25	// that should be passed to MakeTable is 0xD5828281.
26	crc32q := crc32.MakeTable(0xD5828281)
27	fmt.Printf("%08x\n", crc32.Checksum([]byte("Hello world"), crc32q))
28	// Output:
29	// 2964d064
30}
31