From c50fd68f6f1eec78d0c8b2558093ad6305f862b3 Mon Sep 17 00:00:00 2001
From: Derek <derekwbarnett@gmail.com>
Date: Wed, 4 Aug 2010 16:03:07 -0400
Subject: [PATCH] Bug fix in BamReader::Jump()

---
 BamReader.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/BamReader.cpp b/BamReader.cpp
index be6b72b..b1b1b5d 100644
--- a/BamReader.cpp
+++ b/BamReader.cpp
@@ -540,8 +540,10 @@ bool BamReader::BamReaderPrivate::Jump(int refID, int position) {
         
         // if this alignment corresponds to desired position
         // return success of seeking back to 'current offset'
-        if ( (bAlignment.RefID == refID && bAlignment.Position + bAlignment.Length > position) || (bAlignment.RefID > refID) )
+        if ( (bAlignment.RefID == refID && bAlignment.Position + bAlignment.Length > position) || (bAlignment.RefID > refID) ) {
+            if ( o != offsets.begin() ) --o;
             return mBGZF.Seek(*o);
+        }
     }
     
     return result;
-- 
2.39.5