Index: src/java/org/apache/lucene/index/SegmentTermEnum.java
===================================================================
--- src/java/org/apache/lucene/index/SegmentTermEnum.java	(revision 389043)
+++ src/java/org/apache/lucene/index/SegmentTermEnum.java	(working copy)
@@ -62,7 +62,15 @@
       if (format < TermInfosWriter.FORMAT)
         throw new IOException("Unknown format version:" + format);
 
-      size = input.readLong();                    // read the size
+      if (format >= -2){
+        size = input.readLong();                    // read the size
+      } else {
+        // real size is at the end of the file.
+        long filePos = input.getFilePointer();
+        input.seek(input.length() - 8);
+        size = input.readLong();
+        input.seek(filePos);
+      }
       
       if(format == -1){
         if (!isIndex) {
Index: src/java/org/apache/lucene/index/TermInfosWriter.java
===================================================================
--- src/java/org/apache/lucene/index/TermInfosWriter.java	(revision 389043)
+++ src/java/org/apache/lucene/index/TermInfosWriter.java	(working copy)
@@ -27,7 +27,7 @@
 
 final class TermInfosWriter {
   /** The file format version, a negative number. */
-  public static final int FORMAT = -2;
+  public static final int FORMAT = -3;
 
   private FieldInfos fieldInfos;
   private IndexOutput output;
@@ -81,7 +81,6 @@
     isIndex = isi;
     output = directory.createOutput(segment + (isIndex ? ".tii" : ".tis"));
     output.writeInt(FORMAT);                      // write format
-    output.writeLong(0);                          // leave space for size
     output.writeInt(indexInterval);             // write indexInterval
     output.writeInt(skipInterval);              // write skipInterval
   }
@@ -137,7 +136,6 @@
 
   /** Called to complete TermInfos creation. */
   final void close() throws IOException {
-    output.seek(4);          // write size after format
     output.writeLong(size);
     output.close();