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