admin: Can gunzip files

libfic/file.go

@@ -1,6 +1,7 @@
 package fic
 
 import (
+	"compress/gzip"
 	"crypto"
 	_ "crypto/sha1"
 	"encoding/hex"
@@ -403,3 +404,35 @@ func (f *EFile) CheckFileOnDisk() error {
 		return nil
 	}
 }
+
+// GunzipFileOnDisk gunzip a compressed file.
+func (f *EFile) GunzipFileOnDisk() error {
+	if !strings.HasSuffix(f.origin, ".gz") || strings.HasSuffix(f.origin, ".tar.gz") {
+		return nil
+	}
+
+	fdIn, err := os.Open(path.Join(FilesDir, f.Path+".gz"))
+	if err != nil {
+		return err
+	}
+	defer fdIn.Close()
+
+	fdOut, err := os.Create(path.Join(FilesDir, strings.TrimSuffix(f.Path, ".gz")))
+	if err != nil {
+		return err
+	}
+	defer fdOut.Close()
+
+	gunzipfd, err := gzip.NewReader(fdIn)
+	if err != nil {
+		return err
+	}
+	defer gunzipfd.Close()
+
+	_, err = io.Copy(fdOut, gunzipfd)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}