Fix bug 329908: Throw exception if file can't be read in readFile()

git-svn-id: svn://10.0.0.236/trunk@255040 18797224-902f-48f8-a5cc-f745e15eee43

mozilla/js/rhino/toolsrc/org/mozilla/javascript/tools/shell/Global.java

@@ -1037,7 +1037,11 @@ public class Global extends ImporterTopLevel
                 }
             } else {
                 File f = new File(filePath);
-
+                if (!f.exists()) {
+                    throw new FileNotFoundException("File not found: " + filePath);
+                } else if (!f.canRead()) {
+                    throw new IOException("Cannot read file: " + filePath);
+                }
                 long length = f.length();
                 chunkLength = (int)length;
                 if (chunkLength != length)