/
gcompress_gzip.go
117 lines (107 loc) · 2.43 KB
/
gcompress_gzip.go
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// Copyright GoFrame Author(https://goframe.org). All Rights Reserved.
//
// This Source Code Form is subject to the terms of the MIT License.
// If a copy of the MIT was not distributed with this file,
// You can obtain one at https://github.com/bjxujiang/gf.
package gcompress
import (
"bytes"
"compress/gzip"
"github.com/bjxujiang/gf/os/gfile"
"io"
)
// Gzip compresses <data> using gzip algorithm.
// The optional parameter <level> specifies the compression level from
// 1 to 9 which means from none to the best compression.
//
// Note that it returns error if given <level> is invalid.
func Gzip(data []byte, level ...int) ([]byte, error) {
var (
writer *gzip.Writer
buf bytes.Buffer
err error
)
if len(level) > 0 {
writer, err = gzip.NewWriterLevel(&buf, level[0])
if err != nil {
return nil, err
}
} else {
writer = gzip.NewWriter(&buf)
}
if _, err = writer.Write(data); err != nil {
return nil, err
}
if err = writer.Close(); err != nil {
return nil, err
}
return buf.Bytes(), nil
}
// GzipFile compresses the file <src> to <dst> using gzip algorithm.
func GzipFile(src, dst string, level ...int) error {
var (
writer *gzip.Writer
err error
)
srcFile, err := gfile.Open(src)
if err != nil {
return err
}
defer srcFile.Close()
dstFile, err := gfile.Create(dst)
if err != nil {
return err
}
defer dstFile.Close()
if len(level) > 0 {
writer, err = gzip.NewWriterLevel(dstFile, level[0])
if err != nil {
return err
}
} else {
writer = gzip.NewWriter(dstFile)
}
defer writer.Close()
_, err = io.Copy(writer, srcFile)
if err != nil {
return err
}
return nil
}
// UnGzip decompresses <data> with gzip algorithm.
func UnGzip(data []byte) ([]byte, error) {
var buf bytes.Buffer
reader, err := gzip.NewReader(bytes.NewReader(data))
if err != nil {
return nil, err
}
if _, err = io.Copy(&buf, reader); err != nil {
return nil, err
}
if err = reader.Close(); err != nil {
return buf.Bytes(), err
}
return buf.Bytes(), nil
}
// UnGzip decompresses file <src> to <dst> using gzip algorithm.
func UnGzipFile(src, dst string) error {
srcFile, err := gfile.Open(src)
if err != nil {
return err
}
defer srcFile.Close()
dstFile, err := gfile.Create(dst)
if err != nil {
return err
}
defer dstFile.Close()
reader, err := gzip.NewReader(srcFile)
if err != nil {
return err
}
defer reader.Close()
if _, err = io.Copy(dstFile, reader); err != nil {
return err
}
return nil
}