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Diffstat (limited to 'src/hash/crc32/example_test.go')
| -rw-r--r-- | src/hash/crc32/example_test.go | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/src/hash/crc32/example_test.go b/src/hash/crc32/example_test.go new file mode 100644 index 0000000..621bf83 --- /dev/null +++ b/src/hash/crc32/example_test.go @@ -0,0 +1,28 @@ +// 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 +} |