mirror of
https://gitee.com/rainbond/Rainbond.git
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101 lines
2.8 KiB
Go
101 lines
2.8 KiB
Go
// RAINBOND, Application Management Platform
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// Copyright (C) 2014-2017 Goodrain Co., Ltd.
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version. For any non-GPL usage of Rainbond,
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// one or multiple Commercial Licenses authorized by Goodrain Co., Ltd.
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// must be obtained first.
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package util
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import (
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"crypto/md5"
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"fmt"
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"io"
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"math"
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"os"
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)
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const filechunk = 8192 // we settle for 8KB
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//CreateFileHash compute sourcefile hash and write hashfile
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func CreateFileHash(sourceFile, hashfile string) error {
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file, err := os.Open(sourceFile)
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if err != nil {
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return err
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}
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defer file.Close()
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fileinfo, _ := file.Stat()
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if fileinfo.IsDir() {
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return fmt.Errorf("do not support compute folder hash")
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}
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writehashfile, err := os.OpenFile(hashfile, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0655)
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if err != nil {
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return fmt.Errorf("create hash file error %s", err.Error())
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}
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defer writehashfile.Close()
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if fileinfo.Size() < filechunk {
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return createSmallFileHash(file, writehashfile)
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}
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return createBigFileHash(file, writehashfile)
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}
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func createBigFileHash(sourceFile, hashfile *os.File) error {
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// calculate the file size
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info, _ := sourceFile.Stat()
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filesize := info.Size()
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blocks := uint64(math.Ceil(float64(filesize) / float64(filechunk)))
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hash := md5.New()
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for i := uint64(0); i < blocks; i++ {
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blocksize := int(math.Min(filechunk, float64(filesize-int64(i*filechunk))))
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buf := make([]byte, blocksize)
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index, err := sourceFile.Read(buf)
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if err != nil {
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return err
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}
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// append into the hash
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_, err = hash.Write(buf[:index])
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if err != nil {
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return err
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}
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}
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_, err := hashfile.Write([]byte(fmt.Sprintf("%x", hash.Sum(nil))))
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if err != nil {
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return err
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}
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return nil
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}
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func createSmallFileHash(sourceFile, hashfile *os.File) error {
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md5h := md5.New()
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_, err := io.Copy(md5h, sourceFile)
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if err != nil {
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return err
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}
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_, err = hashfile.Write([]byte(fmt.Sprintf("%x", md5h.Sum(nil))))
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if err != nil {
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return err
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}
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return nil
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}
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//CreateHashString create hash string
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func CreateHashString(source string) (hashstr string, err error) {
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md5h := md5.New()
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_, err = md5h.Write([]byte(source))
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if err != nil {
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return "", err
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}
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return fmt.Sprintf("%x", md5h.Sum(nil)), nil
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}
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