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103 lines
2.1 KiB
103 lines
2.1 KiB
package util
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import (
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"bytes"
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"compress/flate"
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"compress/gzip"
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"io/ioutil"
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"strings"
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"golang.org/x/tools/godoc/util"
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"github.com/chrislusf/seaweedfs/weed/glog"
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)
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func GzipData(input []byte) ([]byte, error) {
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buf := new(bytes.Buffer)
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w, _ := gzip.NewWriterLevel(buf, flate.BestSpeed)
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if _, err := w.Write(input); err != nil {
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glog.V(2).Infoln("error compressing data:", err)
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return nil, err
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}
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if err := w.Close(); err != nil {
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glog.V(2).Infoln("error closing compressed data:", err)
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return nil, err
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}
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return buf.Bytes(), nil
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}
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func UnGzipData(input []byte) ([]byte, error) {
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buf := bytes.NewBuffer(input)
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r, _ := gzip.NewReader(buf)
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defer r.Close()
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output, err := ioutil.ReadAll(r)
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if err != nil {
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glog.V(2).Infoln("error uncompressing data:", err)
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}
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return output, err
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}
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/*
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* Default more not to gzip since gzip can be done on client side.
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*/
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func IsGzippable(ext, mtype string, data []byte) bool {
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shouldBeZipped, iAmSure := IsGzippableFileType(ext, mtype)
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if iAmSure {
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return shouldBeZipped
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}
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isMostlyText := util.IsText(data)
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return isMostlyText
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}
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/*
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* Default more not to gzip since gzip can be done on client side.
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*/func IsGzippableFileType(ext, mtype string) (shouldBeZipped, iAmSure bool) {
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// text
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if strings.HasPrefix(mtype, "text/") {
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return true, true
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}
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// images
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switch ext {
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case ".svg", ".bmp", ".wav":
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return true, true
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}
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if strings.HasPrefix(mtype, "image/") {
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return false, true
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}
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// by file name extension
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switch ext {
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case ".zip", ".rar", ".gz", ".bz2", ".xz":
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return false, true
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case ".pdf", ".txt", ".html", ".htm", ".css", ".js", ".json":
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return true, true
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case ".php", ".java", ".go", ".rb", ".c", ".cpp", ".h", ".hpp":
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return true, true
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case ".png", ".jpg", ".jpeg":
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return false, true
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}
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// by mime type
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if strings.HasPrefix(mtype, "application/") {
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if strings.HasSuffix(mtype, "xml") {
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return true, true
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}
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if strings.HasSuffix(mtype, "script") {
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return true, true
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}
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}
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if strings.HasPrefix(mtype, "audio/") {
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switch strings.TrimPrefix(mtype, "audio/") {
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case "wave", "wav", "x-wav", "x-pn-wav":
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return true, true
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}
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}
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return false, false
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}
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