merge with branch 1.x

scm-dao-xml/src/main/java/sonia/scm/store/FileBlob.java

@@ -75,4 +75,13 @@ public final class FileBlob implements Blob {
     return new FileOutputStream(file);
   }
 
+  @Override
+  public long getSize() {
+    if (this.file.isFile()) {
+      return this.file.length();
+    } else {
+      //to sum up all other cases, in which we cannot determine a size
+      return -1;
+    }
+  }
 }