fix(core/rdr3): train config index crash workaround

code/components/gta-core-rdr3/src/PatchTrainConfigCrash.cpp

@@ -0,0 +1,63 @@
+#include <StdInc.h>
+
+#include "atArray.h"
+#include "Hooking.h"
+#include "Hooking.Stubs.h"
+
+struct CTrainToken
+{
+	void* vtable;
+	char pad_8[0xC1];
+	unsigned char m_trainConfigIndex;
+	char pad_CA[6];
+};
+
+struct CTrainConfigs
+{
+	atArray<void*> m_trainConfigs;
+	atArray<void*> m_trainGroups;
+};
+
+static uint32_t GetTrainTokenMethodOffset; // CTrain
+
+static CTrainToken* GetTrainToken(void* train)
+{
+	return (*(CTrainToken*(__fastcall**)(void*))(*(uint64_t*)train + GetTrainTokenMethodOffset))(train);
+}
+
+static CTrainConfigs* g_trainConfigs;
+
+static bool (*g_origRequestTrainCarriageAssets)(void*);
+
+static bool RequestTrainCarriageAssets(void* train)
+{
+	const auto trainToken = (train) ? GetTrainToken(train) : nullptr;
+
+	// Ensure that our train has a train token
+	if (!trainToken)
+	{
+		return false;
+	}
+
+	// Bail out if token's train config index is invalid (usually 0xFF)
+	if (trainToken->m_trainConfigIndex >= g_trainConfigs->m_trainConfigs.GetCount())
+	{
+		return false;
+	}
+
+	return g_origRequestTrainCarriageAssets(train);
+}
+
+static HookFunction hookFunction([]()
+{
+	static_assert(sizeof(CTrainToken) == 0xD0);
+	static_assert(sizeof(CTrainConfigs) == 0x20);
+
+	auto location = hook::get_pattern<char>("44 0F B7 74 DA 28 45 85 F6 0F", -0x4A);
+
+	g_origRequestTrainCarriageAssets = hook::trampoline(location, RequestTrainCarriageAssets);	
+
+	g_trainConfigs = hook::get_address<CTrainConfigs*>(location + 0x3B);
+
+	GetTrainTokenMethodOffset = *(uint32_t*)(location + 0x21);
+});