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minio/pkgs/checksum/crc32c/crc32c.go

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/*
* Mini 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.
*/
// +build amd64
package crc32c
// #include <stdint.h>
// uint32_t crc32c_pcl(uint8_t *buf, int32_t len, uint32_t prev_crc);
import "C"
import (
"errors"
"unsafe"
)
func Crc32c(buffer []byte) (uint32, error) {
var length = len(buffer)
if length == 0 {
return 0, errors.New("Invalid input")
}
var cbuf *C.uint8_t
cbuf = (*C.uint8_t)(unsafe.Pointer(&buffer[0]))
crc := C.crc32c_pcl(cbuf, C.int32_t(length), C.uint32_t(0))
return uint32(crc), nil
}