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update_local.go
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update_local.go
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package file
import (
"bytes"
"crypto/md5"
"encoding/base64"
"encoding/hex"
"io"
"math"
"os"
"strings"
"github.com/gowsp/cloud189/pkg"
)
type LocalFile struct {
parentId string
file *os.File
info os.FileInfo
partName []string
fileMD5 string
sliceMD5 string
sliceNum int
partNum int
overwrite bool
}
func NewLocalFile(parentId string, path string) pkg.Upload {
source, err := os.Open(path)
if err != nil {
return nil
}
info, err := source.Stat()
if err != nil {
return nil
}
size := info.Size()
sliceNum := int(math.Ceil(float64(size) / float64(Slice)))
return &LocalFile{
parentId: parentId,
info: info,
file: source,
sliceNum: sliceNum,
partName: make([]string, sliceNum),
}
}
func (f *LocalFile) Close() {
f.file.Close()
}
func (f *LocalFile) Part(num int64) pkg.UploadPart {
f.partNum = int(num)
data := io.NewSectionReader(f.file, int64(num*Slice), Slice)
buff := bytes.NewBuffer(nil)
io.Copy(buff, data)
return &FilePart{data: buff, num: num, name: f.partName[num]}
}
func (f *LocalFile) Overwrite() bool {
return f.overwrite
}
func (f *LocalFile) ParentId() string {
return f.parentId
}
func (f *LocalFile) Name() string {
return f.info.Name()
}
func (f *LocalFile) Size() int64 {
return f.info.Size()
}
func (f *LocalFile) SliceNum() int {
return f.sliceNum
}
func (f *LocalFile) LazyCheck() bool {
return false
}
func (f *LocalFile) FileMD5() string {
if f.fileMD5 == "" {
f.md5()
}
return f.fileMD5
}
func (f *LocalFile) SliceMD5() string {
if f.sliceMD5 == "" {
f.md5()
}
return f.sliceMD5
}
func (f *LocalFile) md5() error {
count := f.sliceNum
slices := make([]string, count)
global := md5.New()
detail := md5.New()
writer := io.MultiWriter(global, detail)
buf := make([]byte, 32*1024)
for i := 0; i < count; i++ {
offset := int64(i * int(Slice))
s := io.NewSectionReader(f.file, offset, Slice)
io.CopyBuffer(writer, s, buf)
v := detail.Sum(nil)
slices[i] = strings.ToUpper(hex.EncodeToString(v))
f.partName[i] = base64.StdEncoding.EncodeToString(v)
detail.Reset()
}
f.fileMD5 = hex.EncodeToString(global.Sum(nil))
if count > 1 {
slice := strings.Join(slices, "\n")
detail.Write([]byte(slice))
f.sliceMD5 = hex.EncodeToString(detail.Sum(nil))
} else {
f.sliceMD5 = f.fileMD5
}
return nil
}
type FilePart struct {
num int64
name string
data *bytes.Buffer
}
func (f *FilePart) Name() string {
return f.name
}
func (f *FilePart) Num() int {
return int(f.num)
}
func (f *FilePart) Data() io.Reader {
return f.data
}