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: [PATCH] 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.cpp    |  4 ++--
 main.h      | 21 +++++++++++++++++++++
 serialize.h |  2 +-
 3 files changed, 24 insertions(+), 3 deletions(-)

diff --git a/main.cpp b/main.cpp
index 89b42f76e..ae20e08dd 100644
--- a/main.cpp
+++ b/main.cpp
@@ -1960,8 +1960,8 @@ bool ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv)
         // Send the rest of the chain
         if (pindex)
             pindex = pindex->pnext;
-        printf("getblocks %d to %s\n", (pindex ? pindex->nHeight : -1), hashStop.ToString().substr(0,16).c_str());
-        int nLimit = 500;
+        int nLimit = 500 + locator.GetDistanceBack();
+        printf("getblocks %d to %s limit %d\n", (pindex ? pindex->nHeight : -1), hashStop.ToString().substr(0,16).c_str(), nLimit);
         for (; pindex; pindex = pindex->pnext)
         {
             if (pindex->GetBlockHash() == hashStop)
diff --git a/main.h b/main.h
index 79f14c686..822045a57 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
diff --git a/serialize.h b/serialize.h
index aae821b6d..b2d948df9 100644
--- a/serialize.h
+++ b/serialize.h
@@ -20,7 +20,7 @@ class CDataStream;
 class CAutoFile;
 
 static const int VERSION = 106;
-static const char* pszSubVer = " linux-test8";
+static const char* pszSubVer = " linux-test9";