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archive.go
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archive.go
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package bdcrypto
import (
"compress/gzip"
"io"
"os"
)
// GZIPCompress GZIP 压缩
func GZIPCompress(src io.Reader, writeTo io.Writer) (err error) {
w := gzip.NewWriter(writeTo)
_, err = io.Copy(w, src)
if err != nil {
return
}
w.Flush()
return w.Close()
}
// GZIPUncompress GZIP 解压缩
func GZIPUncompress(src io.Reader, writeTo io.Writer) (err error) {
unReader, err := gzip.NewReader(src)
if err != nil {
return err
}
_, err = io.Copy(writeTo, unReader)
if err != nil {
return
}
return unReader.Close()
}
// GZIPCompressFile GZIP 压缩文件
func GZIPCompressFile(filePath string) (err error) {
return gzipCompressFile("en", filePath)
}
// GZIPUnompressFile GZIP 解压缩文件
func GZIPUnompressFile(filePath string) (err error) {
return gzipCompressFile("de", filePath)
}
func gzipCompressFile(op, filePath string) (err error) {
f, err := os.Open(filePath)
if err != nil {
return
}
defer f.Close()
fInfo, err := f.Stat()
if err != nil {
return
}
tempFilePath := filePath + ".gzip.tmp"
// 保留文件权限
tempFile, err := os.OpenFile(tempFilePath, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, fInfo.Mode())
if err != nil {
return
}
defer tempFile.Close()
switch op {
case "en":
err = GZIPCompress(f, tempFile)
case "de":
err = GZIPUncompress(f, tempFile)
default:
panic("unknown op" + op)
}
if err != nil {
os.Remove(tempFilePath)
return
}
return os.Rename(tempFilePath, filePath)
}