Null-account/address PoC-6 updates.

libethereum/State.cpp

@@ -287,7 +287,7 @@ void State::ensureCached(std::map<Address, AddressState>& _cache, Address _a, bo
 		if (state.isNull())
 			s = AddressState(0, 0, h256(), EmptySHA3);
 		else
-			s = AddressState(state[0].toInt<u256>(), state[1].toInt<u256>(), state[2].toHash<h256>(), state[3].toHash<h256>());
+			s = AddressState(state[0].toInt<u256>(), state[1].toInt<u256>(), state[2].toHash<h256>(), state[3].isEmpty() ? EmptySHA3 : state[3].toHash<h256>());
 		bool ok;
 		tie(it, ok) = _cache.insert(make_pair(_a, s));
 	}

libethereum/State.h

@@ -386,10 +386,16 @@ void commit(std::map<Address, AddressState> const& _cache, DB& _db, TrieDB<Addre
 			{
 				h256 ch = sha3(i.second.code());
 				_db.insert(ch, &i.second.code());
-				s << ch;
+				if (i.second.code().size())
+					s << ch;
+				else
+					s << "";
 			}
 			else
-				s << i.second.codeHash();
+				if (i.second.codeHash() == EmptySHA3)
+					s << "";
+				else
+					s << i.second.codeHash();
 
 			_state.insert(i.first, &s.out());
 		}

libethereum/Transaction.cpp

@@ -38,7 +38,7 @@ Transaction::Transaction(bytesConstRef _rlpData, bool _checkSender)
 		nonce = rlp[field = 0].toInt<u256>();
 		gasPrice = rlp[field = 1].toInt<u256>();
 		gas = rlp[field = 2].toInt<u256>();
-		receiveAddress = rlp[field = 3].toHash<Address>();
+		receiveAddress = rlp[field = 3].isEmpty() ? Address() : Address();
 		value = rlp[field = 4].toInt<u256>();
 		data = rlp[field = 5].toBytes();
 		vrs = Signature{ rlp[field = 6].toInt<byte>(), rlp[field = 7].toInt<u256>(), rlp[field = 8].toInt<u256>() };
@@ -119,7 +119,12 @@ void Transaction::sign(Secret _priv)
 void Transaction::fillStream(RLPStream& _s, bool _sig) const
 {
 	_s.appendList((_sig ? 3 : 0) + 6);
-	_s << nonce << gasPrice << gas << receiveAddress << value << data;
+	_s << nonce << gasPrice << gas;
+	if (receiveAddress)
+		_s << receiveAddress;
+	else
+		_s << "";
+	_s << value << data;
 	if (_sig)
 		_s << vrs.v << vrs.r << vrs.s;
 }