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Source file src/hash/crc32/example_test.go

Documentation: hash/crc32

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

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