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hash.go
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hash.go
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/*
* Copyright 2015 Xuyuan Pang
* Author: Xuyuan Pang
*
* 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 common
import (
"crypto/md5"
"hash"
"io"
"os"
)
// Hash computes the content from reader by the provided hash function
// and return the checksum, content length, and error.
func Hash(h hash.Hash, r io.Reader) ([]byte, int64, error) {
n, err := io.Copy(h, r)
if err != nil {
return nil, 0, err
}
return h.Sum(nil), n, nil
}
// Hash computes the content from file by the provided hash function
// and return the checksum, content length, and error.
func HashFile(h hash.Hash, name string) ([]byte, int64, error) {
file, err := os.Open(name)
if err != nil {
return nil, 0, err
}
defer file.Close()
return Hash(h, file)
}
// MD5 computes the md5 checksum of the content of r
func MD5(r io.Reader) ([]byte, int64, error) {
return Hash(md5.New(), r)
}
// MD5 computes the md5 checksum of file
func MD5File(name string) ([]byte, int64, error) {
return HashFile(md5.New(), name)
}