Split off CBlockHeader from CBlock

Cleaner and removes the need for the application-specific flags in
serialize.h.

src/main.cpp

@@ -998,21 +998,16 @@ CBlockIndex* FindBlockByHeight(int nHeight)
     return pblockindex;
 }
 
-bool CBlock::ReadFromDisk(const CBlockIndex* pindex, bool fReadTransactions)
+bool CBlock::ReadFromDisk(const CBlockIndex* pindex)
 {
-    if (!fReadTransactions)
+    if (!ReadFromDisk(pindex->GetBlockPos()))
-    {
-        *this = pindex->GetBlockHeader();
-        return true;
-    }
-    if (!ReadFromDisk(pindex->GetBlockPos(), fReadTransactions))
         return false;
     if (GetHash() != pindex->GetBlockHash())
         return error("CBlock::ReadFromDisk() : GetHash() doesn't match index");
     return true;
 }
 
-uint256 static GetOrphanRoot(const CBlock* pblock)
+uint256 static GetOrphanRoot(const CBlockHeader* pblock)
 {
     // Work back to the first block in the orphan chain
     while (mapOrphanBlocks.count(pblock->hashPrevBlock))
@@ -1059,7 +1054,7 @@ unsigned int ComputeMinWork(unsigned int nBase, int64 nTime)
     return bnResult.GetCompact();
 }
 
-unsigned int static GetNextWorkRequired(const CBlockIndex* pindexLast, const CBlock *pblock)
+unsigned int static GetNextWorkRequired(const CBlockIndex* pindexLast, const CBlockHeader *pblock)
 {
     unsigned int nProofOfWorkLimit = bnProofOfWorkLimit.GetCompact();
 
@@ -1233,7 +1228,7 @@ bool ConnectBestBlock() {
     } while(true);
 }
 
-void CBlock::UpdateTime(const CBlockIndex* pindexPrev)
+void CBlockHeader::UpdateTime(const CBlockIndex* pindexPrev)
 {
     nTime = max(pindexPrev->GetMedianTimePast()+1, GetAdjustedTime());
 
@@ -3072,6 +3067,7 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv)
                 pindex = pindex->pnext;
         }
 
+        // we must use CBlocks, as CBlockHeaders won't include the 0x00 nTx count at the end
         vector<CBlock> vHeaders;
         int nLimit = 2000;
         printf("getheaders %d to %s\n", (pindex ? pindex->nHeight : -1), hashStop.ToString().substr(0,20).c_str());

src/main.h

@@ -1068,7 +1068,7 @@ public:
  * in the block is a special one that creates a new coin owned by the creator
  * of the block.
  */
-class CBlock
+class CBlockHeader
 {
 public:
     // header
@@ -1080,17 +1080,7 @@ public:
     unsigned int nBits;
     unsigned int nNonce;
 
-    // network and disk
+    CBlockHeader()
-    std::vector<CTransaction> vtx;
-
-    // memory only
-    mutable std::vector<uint256> vMerkleTree;
-
-    // Denial-of-service detection:
-    mutable int nDoS;
-    bool DoS(int nDoSIn, bool fIn) const { nDoS += nDoSIn; return fIn; }
-
-    CBlock()
     {
         SetNull();
     }
@@ -1104,25 +1094,16 @@ public:
         READWRITE(nTime);
         READWRITE(nBits);
         READWRITE(nNonce);
-
-        // ConnectBlock depends on vtx being last so it can calculate offset
-        if (!(nType & (SER_GETHASH|SER_BLOCKHEADERONLY)))
-            READWRITE(vtx);
-        else if (fRead)
-            const_cast<CBlock*>(this)->vtx.clear();
     )
 
     void SetNull()
     {
-        nVersion = CBlock::CURRENT_VERSION;
+        nVersion = CBlockHeader::CURRENT_VERSION;
         hashPrevBlock = 0;
         hashMerkleRoot = 0;
         nTime = 0;
         nBits = 0;
         nNonce = 0;
-        vtx.clear();
-        vMerkleTree.clear();
-        nDoS = 0;
     }
 
     bool IsNull() const
@@ -1141,7 +1122,45 @@ public:
     }
 
     void UpdateTime(const CBlockIndex* pindexPrev);
+};
 
+class CBlock : public CBlockHeader
+{
+public:
+    // network and disk
+    std::vector<CTransaction> vtx;
+
+    // memory only
+    mutable std::vector<uint256> vMerkleTree;
+
+    // Denial-of-service detection:
+    mutable int nDoS;
+    bool DoS(int nDoSIn, bool fIn) const { nDoS += nDoSIn; return fIn; }
+
+    CBlock()
+    {
+        SetNull();
+    }
+
+    CBlock(const CBlockHeader &header)
+    {
+        SetNull();
+        *((CBlockHeader*)this) = header;
+    }
+
+    IMPLEMENT_SERIALIZE
+    (
+        READWRITE(*(CBlockHeader*)this);
+        READWRITE(vtx);
+    )
+
+    void SetNull()
+    {
+        CBlockHeader::SetNull();
+        vtx.clear();
+        vMerkleTree.clear();
+        nDoS = 0;
+    }
 
     uint256 BuildMerkleTree() const
     {
@@ -1226,7 +1245,7 @@ public:
         return true;
     }
 
-    bool ReadFromDisk(const CDiskBlockPos &pos, bool fReadTransactions = true)
+    bool ReadFromDisk(const CDiskBlockPos &pos)
     {
         SetNull();
 
@@ -1234,8 +1253,6 @@ public:
         CAutoFile filein = CAutoFile(OpenBlockFile(pos, true), SER_DISK, CLIENT_VERSION);
         if (!filein)
             return error("CBlock::ReadFromDisk() : OpenBlockFile failed");
-        if (!fReadTransactions)
-            filein.nType |= SER_BLOCKHEADERONLY;
 
         // Read block
         try {
@@ -1282,7 +1299,7 @@ public:
     bool ConnectBlock(CBlockIndex *pindex, CCoinsViewCache &coins, bool fJustCheck=false);
 
     // Read a block from disk
-    bool ReadFromDisk(const CBlockIndex* pindex, bool fReadTransactions=true);
+    bool ReadFromDisk(const CBlockIndex* pindex);
 
     // Add this block to the block index, and if necessary, switch the active block chain to this
     bool AddToBlockIndex(const CDiskBlockPos &pos);
@@ -1447,7 +1464,7 @@ public:
         nNonce         = 0;
     }
 
-    CBlockIndex(CBlock& block)
+    CBlockIndex(CBlockHeader& block)
     {
         phashBlock = NULL;
         pprev = NULL;
@@ -1488,9 +1505,9 @@ public:
         return ret;
     }
 
-    CBlock GetBlockHeader() const
+    CBlockHeader GetBlockHeader() const
     {
-        CBlock block;
+        CBlockHeader block;
         block.nVersion       = nVersion;
         if (pprev)
             block.hashPrevBlock = pprev->GetBlockHash();
@@ -1634,7 +1651,7 @@ public:
 
     uint256 GetBlockHash() const
     {
-        CBlock block;
+        CBlockHeader block;
         block.nVersion        = nVersion;
         block.hashPrevBlock   = hashPrev;
         block.hashMerkleRoot  = hashMerkleRoot;

src/rpcblockchain.cpp

@@ -154,7 +154,7 @@ Value getblock(const Array& params, bool fHelp)
 
     CBlock block;
     CBlockIndex* pblockindex = mapBlockIndex[hash];
-    block.ReadFromDisk(pblockindex, true);
+    block.ReadFromDisk(pblockindex);
 
     return blockToJSON(block, pblockindex);
 }

src/serialize.h

@@ -50,10 +50,6 @@ enum
     SER_NETWORK         = (1 << 0),
     SER_DISK            = (1 << 1),
     SER_GETHASH         = (1 << 2),
-
-    // modifiers
-    SER_SKIPSIG         = (1 << 16),
-    SER_BLOCKHEADERONLY = (1 << 17),
 };
 
 #define IMPLEMENT_SERIALIZE(statements)    \

src/wallet.cpp

@@ -752,7 +752,7 @@ int CWallet::ScanForWalletTransactions(CBlockIndex* pindexStart, bool fUpdate)
         while (pindex)
         {
             CBlock block;
-            block.ReadFromDisk(pindex, true);
+            block.ReadFromDisk(pindex);
             BOOST_FOREACH(CTransaction& tx, block.vtx)
             {
                 if (AddToWalletIfInvolvingMe(tx.GetHash(), tx, &block, fUpdate))