From 871fb7991313a02e36f50dfe8661dc40cb87cea5 Mon Sep 17 00:00:00 2001
From: Denis Molony <dmolony@iinet.net.au>
Date: Sat, 17 Dec 2016 21:02:38 +1100
Subject: [PATCH] Check for shape table

---
 src/com/bytezone/diskbrowser/applefile/ShapeTable.java | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/com/bytezone/diskbrowser/applefile/ShapeTable.java b/src/com/bytezone/diskbrowser/applefile/ShapeTable.java
index c5ca385..d7d533d 100755
--- a/src/com/bytezone/diskbrowser/applefile/ShapeTable.java
+++ b/src/com/bytezone/diskbrowser/applefile/ShapeTable.java
@@ -134,6 +134,11 @@ public class ShapeTable extends AbstractFile
     if (totalShapes == 0)
       return false;
 
+    // this prevents large files that start with a very small value
+    //    System.out.printf ("Average shape length: %d%n", buffer.length / totalShapes);
+    if (totalShapes * 500 < buffer.length)
+      return false;
+
     for (int i = 0; i < totalShapes; i++)
     {
       // check index table entry is inside the file
@@ -149,6 +154,7 @@ public class ShapeTable extends AbstractFile
       // check offset is unique
       if (offsets.contains (offset))
         return false;
+
       offsets.add (offset);
     }