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31 lines
1.0 KiB
Go
31 lines
1.0 KiB
Go
// Copyright 2015 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build ignore
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package crc32_test
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import (
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"fmt"
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"hash/crc32"
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)
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func ExampleMakeTable() {
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// In this package, the CRC polynomial is represented in reversed notation,
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// or LSB-first representation.
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//
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// LSB-first representation is a hexadecimal number with n bits, in which the
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// most significant bit represents the coefficient of x⁰ and the least significant
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// bit represents the coefficient of xⁿ⁻¹ (the coefficient for xⁿ is implicit).
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//
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// For example, CRC32-Q, as defined by the following polynomial,
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// x³²+ x³¹+ x²⁴+ x²²+ x¹⁶+ x¹⁴+ x⁸+ x⁷+ x⁵+ x³+ x¹+ x⁰
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// has the reversed notation 0b11010101100000101000001010000001, so the value
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// that should be passed to MakeTable is 0xD5828281.
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crc32q := crc32.MakeTable(0xD5828281)
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fmt.Printf("%08x\n", crc32.Checksum([]byte("Hello world"), crc32q))
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// Output:
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// 2964d064
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}
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