fix download progress

app/download.service.ts

@@ -54,11 +54,10 @@ export class DownloadStatus {
                     status.errorCode = o.errorCode;
                     status.errorMessage = o.errorMessage;
                 }
-                status.downloadSpeed += o.downloadSpeed;
-                status.totalLength += o.totalLength;
-                status.completedLength += o.completedLength;
             }
-
+            status.downloadSpeed += o.downloadSpeed;
+            status.totalLength += o.totalLength;
+            status.completedLength += o.completedLength;
         }
         return status;
     }
@@ -79,7 +78,7 @@ export class DownloadStatus {
         if (item) {
             this.completedLength = parseInt(item.completedLength) || 0;
             this.downloadSpeed = parseInt(item.downloadSpeed) || 0;
-            this.totalLength = parseInt(item.totalLength) || 0;
+            this.totalLength = parseInt(item.totalLength) || parseInt(item.files[0].length) || 0;
             this.gid = item.gid;
             this.status = item.status;
             this.errorCode = item.errorCode;