fail more gracefully if writing large index

git-svn-id: https://svn.code.sf.net/p/jackcess/code/jackcess/trunk@125 f203690c-595d-4dc9-a70b-905162fa7fd2

1 files changed, 5 insertions, 1 deletions

diff --git a/src/java/com/healthmarketscience/jackcess/Index.java b/src/java/com/healthmarketscience/jackcess/Index.java
index 43d9888..602bd5f 100644
--- a/src/java/com/healthmarketscience/jackcess/Index.java
+++ b/src/java/com/healthmarketscience/jackcess/Index.java
@@ -259,7 +259,7 @@ public class Index implements Comparable<Index> {
     buffer.putInt(0); //Next page
     buffer.putInt(0); //Leaf page
     buffer.putInt(0); //Unknown
-    buffer.put((byte) 0); //Unknown
+    buffer.put((byte) 0); // compressed byte count
     buffer.put((byte) 0); //Unknown
     buffer.put((byte) 0); //Unknown
     byte[] entryMask = new byte[_format.SIZE_INDEX_ENTRY_MASK];
@@ -270,6 +270,10 @@ public class Index implements Comparable<Index> {
       int size = entry.size();
       totalSize += size;
       int idx = totalSize  / 8;
+      if(idx >= entryMask.length) {
+        throw new UnsupportedOperationException(
+            "FIXME cannot write large index yet");
+      }
       entryMask[idx] |= (1 << (totalSize % 8));
     }
     buffer.put(entryMask);