From e035c6a7371027fe33c460ee2d0946a7f1e4e592 Mon Sep 17 00:00:00 2001
From: jtimon <jtimon@blockstream.io>
Date: Mon, 27 Oct 2014 14:35:52 +0100
Subject: [PATCH] Decouple CBlockUndo from CDiskBlockPos

---
 src/main.cpp | 31 ++++++++++++++++---------------
 src/main.h   |  3 ---
 2 files changed, 16 insertions(+), 18 deletions(-)

diff --git a/src/main.cpp b/src/main.cpp
index bcd3a5ff0..ec24e55ce 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1520,7 +1520,8 @@ bool CheckInputs(const CTransaction& tx, CValidationState &state, const CCoinsVi
     return true;
 }
 
-
+bool UndoWriteToDisk(const CBlockUndo& blockundo, CDiskBlockPos& pos, const uint256& hashBlock);
+bool UndoReadFromDisk(CBlockUndo& blockundo, const CDiskBlockPos& pos, const uint256& hashBlock);
 
 bool DisconnectBlock(CBlock& block, CValidationState& state, CBlockIndex* pindex, CCoinsViewCache& view, bool* pfClean)
 {
@@ -1535,7 +1536,7 @@ bool DisconnectBlock(CBlock& block, CValidationState& state, CBlockIndex* pindex
     CDiskBlockPos pos = pindex->GetUndoPos();
     if (pos.IsNull())
         return error("DisconnectBlock() : no undo data available");
-    if (!blockUndo.ReadFromDisk(pos, pindex->pprev->GetBlockHash()))
+    if (!UndoReadFromDisk(blockUndo, pos, pindex->pprev->GetBlockHash()))
         return error("DisconnectBlock() : failure reading undo data");
 
     if (blockUndo.vtxundo.size() + 1 != block.vtx.size())
@@ -1777,7 +1778,7 @@ bool ConnectBlock(const CBlock& block, CValidationState& state, CBlockIndex* pin
             CDiskBlockPos pos;
             if (!FindUndoPos(state, pindex->nFile, pos, ::GetSerializeSize(blockundo, SER_DISK, CLIENT_VERSION) + 40))
                 return error("ConnectBlock() : FindUndoPos failed");
-            if (!blockundo.WriteToDisk(pos, pindex->pprev->GetBlockHash()))
+            if (!UndoWriteToDisk(blockundo, pos, pindex->pprev->GetBlockHash()))
                 return state.Abort("Failed to write undo data");
 
             // update nUndoPos in block index
@@ -2943,7 +2944,7 @@ bool CVerifyDB::VerifyDB(CCoinsView *coinsview, int nCheckLevel, int nCheckDepth
             CBlockUndo undo;
             CDiskBlockPos pos = pindex->GetUndoPos();
             if (!pos.IsNull()) {
-                if (!undo.ReadFromDisk(pos, pindex->pprev->GetBlockHash()))
+                if (!UndoReadFromDisk(undo, pos, pindex->pprev->GetBlockHash()))
                     return error("VerifyDB() : *** found bad undo data at %d, hash=%s\n", pindex->nHeight, pindex->GetBlockHash().ToString());
             }
         }
@@ -4509,44 +4510,44 @@ bool SendMessages(CNode* pto, bool fSendTrickle)
 }
 
 
-bool CBlockUndo::WriteToDisk(CDiskBlockPos &pos, const uint256 &hashBlock)
+bool UndoWriteToDisk(const CBlockUndo& blockundo, CDiskBlockPos& pos, const uint256& hashBlock)
 {
     // Open history file to append
     CAutoFile fileout(OpenUndoFile(pos), SER_DISK, CLIENT_VERSION);
     if (fileout.IsNull())
-        return error("CBlockUndo::WriteToDisk : OpenUndoFile failed");
+        return error("%s : OpenUndoFile failed", __func__);
 
     // Write index header
-    unsigned int nSize = fileout.GetSerializeSize(*this);
+    unsigned int nSize = fileout.GetSerializeSize(blockundo);
     fileout << FLATDATA(Params().MessageStart()) << nSize;
 
     // Write undo data
     long fileOutPos = ftell(fileout.Get());
     if (fileOutPos < 0)
-        return error("CBlockUndo::WriteToDisk : ftell failed");
+        return error("%s : ftell failed", __func__);
     pos.nPos = (unsigned int)fileOutPos;
-    fileout << *this;
+    fileout << blockundo;
 
     // calculate & write checksum
     CHashWriter hasher(SER_GETHASH, PROTOCOL_VERSION);
     hasher << hashBlock;
-    hasher << *this;
+    hasher << blockundo;
     fileout << hasher.GetHash();
 
     return true;
 }
 
-bool CBlockUndo::ReadFromDisk(const CDiskBlockPos &pos, const uint256 &hashBlock)
+bool UndoReadFromDisk(CBlockUndo& blockundo, const CDiskBlockPos& pos, const uint256& hashBlock)
 {
     // Open history file to read
     CAutoFile filein(OpenUndoFile(pos, true), SER_DISK, CLIENT_VERSION);
     if (filein.IsNull())
-        return error("CBlockUndo::ReadFromDisk : OpenBlockFile failed");
+        return error("%s : OpenBlockFile failed", __func__);
 
     // Read block
     uint256 hashChecksum;
     try {
-        filein >> *this;
+        filein >> blockundo;
         filein >> hashChecksum;
     }
     catch (const std::exception& e) {
@@ -4556,9 +4557,9 @@ bool CBlockUndo::ReadFromDisk(const CDiskBlockPos &pos, const uint256 &hashBlock
     // Verify checksum
     CHashWriter hasher(SER_GETHASH, PROTOCOL_VERSION);
     hasher << hashBlock;
-    hasher << *this;
+    hasher << blockundo;
     if (hashChecksum != hasher.GetHash())
-        return error("CBlockUndo::ReadFromDisk : Checksum mismatch");
+        return error("%s : Checksum mismatch", __func__);
 
     return true;
 }
diff --git a/src/main.h b/src/main.h
index e38b413be..7d6c293a3 100644
--- a/src/main.h
+++ b/src/main.h
@@ -314,9 +314,6 @@ public:
     inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) {
         READWRITE(vtxundo);
     }
-
-    bool WriteToDisk(CDiskBlockPos &pos, const uint256 &hashBlock);
-    bool ReadFromDisk(const CDiskBlockPos &pos, const uint256 &hashBlock);
 };