Extend bridge signal simulation to support an unlimited no. of signals.

This is instead of the previous limit of 16, all stored in M2.

src/saveload/bridge_signal_sl.cpp

@@ -0,0 +1,58 @@
+/* $Id$ */
+
+/*
+ * This file is part of OpenTTD.
+ * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
+ * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/** @file bridge_signal_sl.cpp Code handling saving and loading of data for signal on bridges */
+
+#include "../stdafx.h"
+#include "../bridge_signal_map.h"
+#include "saveload.h"
+#include <vector>
+
+/** stub save header struct */
+struct LongBridgeSignalStorageStub {
+	uint32 length;
+};
+
+static const SaveLoad _long_bridge_signal_storage_stub_desc[] = {
+	SLE_VAR(LongBridgeSignalStorageStub, length, SLE_UINT32),
+	SLE_END()
+};
+
+static void Load_XBSS()
+{
+	int index;
+	LongBridgeSignalStorageStub stub;
+	while ((index = SlIterateArray()) != -1) {
+		LongBridgeSignalStorage &lbss = _long_bridge_signal_sim_map[index];
+		SlObject(&stub, _long_bridge_signal_storage_stub_desc);
+		lbss.signal_red_bits.resize(stub.length);
+		SlArray(&(lbss.signal_red_bits[0]), stub.length, SLE_UINT64);
+	}
+}
+
+static void RealSave_XBSS(const LongBridgeSignalStorage *lbss)
+{
+	LongBridgeSignalStorageStub stub;
+	stub.length = lbss->signal_red_bits.size();
+	SlObject(&stub, _long_bridge_signal_storage_stub_desc);
+	SlArray(const_cast<uint64*>(&(lbss->signal_red_bits[0])), stub.length, SLE_UINT64);
+}
+
+static void Save_XBSS()
+{
+	for (const auto &it : _long_bridge_signal_sim_map) {
+		const LongBridgeSignalStorage &lbss = it.second;
+		SlSetArrayIndex(it.first);
+		SlAutolength((AutolengthProc*) RealSave_XBSS, const_cast<LongBridgeSignalStorage*>(&lbss));
+	}
+}
+
+extern const ChunkHandler _bridge_signal_chunk_handlers[] = {
+	{ 'XBSS', Save_XBSS, Load_XBSS, NULL, NULL, CH_SPARSE_ARRAY | CH_LAST},
+};