Add a CMerkleBlock to store merkle branches of filtered txes.

src/main.h

@@ -2039,4 +2039,34 @@ struct CBlockTemplate
     std::vector<int64_t> vTxSigOps;
 };
 
+
+
+
+
+
+/** Used to relay blocks as header + vector<merkle branch>
+ * to filtered nodes.
+ */
+class CMerkleBlock
+{
+public:
+    CBlockHeader header;
+
+    // We could optimize this a bit to deduplicate partial branches,
+    // but it's not worth much unless a node has a ton of txes in a single block
+    //                       tx index    , tx hash, merkle branch
+    std::vector<boost::tuple<unsigned int, uint256, std::vector<uint256> > > vtx;
+
+    // Create from a CBlock, filtering transactions according to filter
+    // Note that this will call IsRelevantAndUpdate on the filter for each transaction,
+    // thus the filter will likely be modified.
+    CMerkleBlock(const CBlock& block, CBloomFilter& filter);
+
+    IMPLEMENT_SERIALIZE
+    (
+        READWRITE(header);
+        READWRITE(vtx);
+    )
+};
+
 #endif