forgejo/vendor/github.com/syndtr/goleveldb/leveldb/util/crc32.go
Thomas Boerger b6a95a8cb3 Integrate public as bindata optionally (#293)
* Dropped unused codekit config

* Integrated dynamic and static bindata for public

* Ignore public bindata

* Add a general generate make task

* Integrated flexible public assets into web command

* Updated vendoring, added all missiong govendor deps

* Made the linter happy with the bindata and dynamic code

* Moved public bindata definition to modules directory

* Ignoring the new bindata path now

* Updated to the new public modules import path

* Updated public bindata command and drop the new prefix
2016-11-30 00:26:36 +08:00

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Go

// Copyright 2011 The LevelDB-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 util
import (
"hash/crc32"
)
var table = crc32.MakeTable(crc32.Castagnoli)
// CRC is a CRC-32 checksum computed using Castagnoli's polynomial.
type CRC uint32
// NewCRC creates a new crc based on the given bytes.
func NewCRC(b []byte) CRC {
return CRC(0).Update(b)
}
// Update updates the crc with the given bytes.
func (c CRC) Update(b []byte) CRC {
return CRC(crc32.Update(uint32(c), table, b))
}
// Value returns a masked crc.
func (c CRC) Value() uint32 {
return uint32(c>>15|c<<17) + 0xa282ead8
}