avoid reparsing the multipart form

weed/storage/needle_parse_multipart.go

@@ -8,10 +8,11 @@ import (
 	"net/http"
 	"path"
 	"strings"
+	"strconv"
 )
 
-func parseMultipart(r *http.Request, isChunkedFile bool) (
-	fileName string, data []byte, mimeType string, isGzipped bool, e error) {
+func parseMultipart(r *http.Request) (
+	fileName string, data []byte, mimeType string, isGzipped, isChunkedFile bool, e error) {
 	form, fe := r.MultipartReader()
 	if fe != nil {
 		glog.V(0).Infoln("MultipartReader [ERROR]", fe)
@@ -63,6 +64,8 @@ func parseMultipart(r *http.Request, isChunkedFile bool) (
 		}
 	}
 
+	isChunkedFile, _ = strconv.ParseBool(r.FormValue("cm"))
+
 	if !isChunkedFile {
 
 		dotIndex := strings.LastIndex(fileName, ".")