From 52f4cb48590a706caf7a492e8d94b85620d5cd33 Mon Sep 17 00:00:00 2001
From: s_nakamoto <s_nakamoto@1a98c847-1fd6-4fd8-948a-caf3550aa51b>
Date: Tue, 24 Nov 2009 21:04:50 +0000
Subject: minor fix to batched initial download in case requester has more than
 500 block non-main branch

git-svn-id: https://bitcoin.svn.sourceforge.net/svnroot/bitcoin/trunk@41 1a98c847-1fd6-4fd8-948a-caf3550aa51b
---
 main.h | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

(limited to 'main.h')

diff --git a/main.h b/main.h
index 79f14c6861..822045a573 100644
--- a/main.h
+++ b/main.h
@@ -1298,6 +1298,27 @@ public:
         vHave.push_back(hashGenesisBlock);
     }
 
+    int GetDistanceBack()
+    {
+        // Retrace how far back it was in the sender's branch
+        int nDistance = 0;
+        int nStep = 1;
+        foreach(const uint256& hash, vHave)
+        {
+            map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(hash);
+            if (mi != mapBlockIndex.end())
+            {
+                CBlockIndex* pindex = (*mi).second;
+                if (pindex->IsInMainChain())
+                    return nDistance;
+            }
+            nDistance += nStep;
+            if (nDistance > 10)
+                nStep *= 2;
+        }
+        return nDistance;
+    }
+
     CBlockIndex* GetBlockIndex()
     {
         // Find the first block the caller has in the main chain
-- 
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