Files over 4 Gig in size encountered an error resulting in an unsuccessful copy as
per (upstream) Bug Request ID: 1110812.

The assignment 'len = job->basis_len' sometimes overflows. Made changes so that
assignment is done only when appropriate.

rs_mdfour variables B and C were observed to overflow their 'int' definition.
This has been changed to 'unsigned int', which is now consistent with like coding
in the openssl package.

--- librsync-0.9.7/mdfour.h			2004-02-08 00:17:57.000000000 +0100
+++ librsync-0.9.7/mdfour.h.lfs_overflow	2006-03-10 11:44:10.000000000 +0100
@@ -1,7 +1,7 @@
 /*= -*- c-basic-offset: 4; indent-tabs-mode: nil; -*-
  *
  * librsync -- the library for network deltas
- * $Id: mdfour.h,v 1.7 2003/10/17 16:15:21 abo Exp $
+ * $Id: mdfour.h,v 1.8 2006/03/10 10:44:10 abo Exp $
  * 
  * Copyright (C) 2000, 2001 by Martin Pool <mbp@samba.org>
  * Copyright (C) 2002, 2003 by Donovan Baarda <abo@minkirri.apana.org.au> 
@@ -24,7 +24,7 @@
 #include "types.h"
 
 struct rs_mdfour {
-    int                 A, B, C, D;
+    unsigned int        A, B, C, D;
 #if HAVE_UINT64
     uint64_t            totalN;
 #else
--- librsync-0.9.7/patch.c			2004-09-17 23:35:50.000000000 +0200
+++ librsync-0.9.7/patch.c.lfs_overflow		2006-03-10 11:44:10.000000000 +0100
@@ -1,7 +1,7 @@
 /*= -*- c-basic-offset: 4; indent-tabs-mode: nil; -*-
  *
  * librsync -- the library for network deltas
- * $Id: patch.c,v 1.30 2004/09/10 02:48:58 mbp Exp $
+ * $Id: patch.c,v 1.31 2006/03/10 10:44:10 abo Exp $
  * 
  * Copyright (C) 2000, 2001 by Martin Pool <mbp@samba.org>
  * 
@@ -214,12 +214,9 @@
     void            *buf, *ptr;
     rs_buffers_t    *buffs = job->stream;
 
-    len = job->basis_len;
-    
     /* copy only as much as will fit in the output buffer, so that we
      * don't have to block or store the input. */
-    if (len > buffs->avail_out)
-        len = buffs->avail_out;
+    len = (buffs->avail_out < job->basis_len) ? buffs->avail_out : job->basis_len;
 
     if (!len)
         return RS_BLOCKED;