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pkg/crc/crc.go
53 строки
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Ivan Valdes
Enable goheader golangi-lint linter
20 окт 2025, 07:36
20 окт 2025, 07:36
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// Copyright 2025 The etcd Authors // // Licensed under the Apache License, Version 2.0 (the "License"); // you may not use this file except in compliance with the License. // You may obtain a copy of the License at // // http://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, software // distributed under the License is distributed on an "AS IS" BASIS, // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. // See the License for the specific language governing permissions and // limitations under the License. // Package crc provides utility function for cyclic redundancy check // algorithms. package crc import ( "hash" "hash/crc32" ) // The size of a CRC-32 checksum in bytes. const Size = 4 type digest struct { crc uint32 tab *crc32.Table } // New creates a new hash.Hash32 computing the CRC-32 checksum // using the polynomial represented by the Table. // Modified by xiangli to take a prevcrc. func New(prev uint32, tab *crc32.Table) hash.Hash32 { return &digest{prev, tab} } func (d *digest) Size() int { return Size } func (d *digest) BlockSize() int { return 1 } func (d *digest) Reset() { d.crc = 0 } func (d *digest) Write(p []byte) (n int, err error) { d.crc = crc32.Update(d.crc, d.tab, p) return len(p), nil } func (d *digest) Sum32() uint32 { return d.crc } func (d *digest) Sum(in []byte) []byte { s := d.Sum32() return append(in, byte(s>>24), byte(s>>16), byte(s>>8), byte(s)) }