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

1 files changed, 21 insertions, 0 deletions

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