forked from kudoochui/kudos
/
compress.go
84 lines (75 loc) · 1.28 KB
/
compress.go
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package util
import (
"bytes"
"compress/gzip"
"io/ioutil"
"sync"
)
var (
spWriter sync.Pool
spReader sync.Pool
spBuffer sync.Pool
)
func init() {
spWriter = sync.Pool{New: func() interface{} {
return new(gzip.Writer)
}}
spReader = sync.Pool{New: func() interface{} {
return new(gzip.Reader)
}}
spBuffer = sync.Pool{New: func() interface{} {
return bytes.NewBuffer(nil)
}}
}
// Unzip unzips data.
func Unzip(data []byte) ([]byte, error) {
buf := spBuffer.Get().(*bytes.Buffer)
defer func() {
buf.Reset()
spBuffer.Put(buf)
}()
_, err := buf.Write(data)
if err != nil {
return nil, err
}
gr := spReader.Get().(*gzip.Reader)
defer func() {
spReader.Put(gr)
}()
err = gr.Reset(buf)
if err != nil {
return nil, err
}
defer gr.Close()
data, err = ioutil.ReadAll(gr)
if err != nil {
return nil, err
}
return data, err
}
// Zip zips data.
func Zip(data []byte) ([]byte, error) {
buf := spBuffer.Get().(*bytes.Buffer)
w := spWriter.Get().(*gzip.Writer)
w.Reset(buf)
defer func() {
buf.Reset()
spBuffer.Put(buf)
w.Close()
spWriter.Put(w)
}()
_, err := w.Write(data)
if err != nil {
return nil, err
}
err = w.Flush()
if err != nil {
return nil, err
}
err = w.Close()
if err != nil {
return nil, err
}
dec := buf.Bytes()
return dec, nil
}