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minio/pkg/hash/crc32c/crc32c_windows.go

52 lines
1.2 KiB

/*
* Minimalist Object Storage, (C) 2014 Minio, Inc.
*
* 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 crc32c
import (
"hash/crc32"
"io"
)
var castanagoliTable = crc32.MakeTable(crc32.Castagnoli)
/// Convenience functions
// Sum32 - single caller crc helper
func Sum32(buffer []byte) uint32 {
crc := crc32.New(castanagoliTable)
crc.Reset()
crc.Write(buffer)
return crc.Sum32()
}
// Sum - io.Reader based crc helper
func Sum(reader io.Reader) (uint32, error) {
h := crc32.New(castanagoliTable)
var err error
for err == nil {
length := 0
byteBuffer := make([]byte, 1024*1024)
length, err = reader.Read(byteBuffer)
byteBuffer = byteBuffer[0:length]
h.Write(byteBuffer)
}
if err != io.EOF {
return 0, err
}
return h.Sum32(), nil
}