fix(gta-core-five): scenario model validation

Author: prikolium-cfx

code/components/gta-core-five/src/CrashFixes.ScenarioModelSpoof.cpp

@@ -0,0 +1,55 @@
+#include <StdInc.h>
+#include <Hooking.h>
+#include <Hooking.Stubs.h>
+#include <jitasm.h>
+
+static HookFunction hookFunction([]
+{
+	auto location = hook::get_pattern<uint8_t>("48 8B 82 ? ? ? ? 8B 48 ? 89 8F");
+
+	static struct : jitasm::Frontend
+	{
+		intptr_t location;
+		intptr_t retSuccess;
+		intptr_t retFail;
+
+		uint32_t compositeBoundFlagsArrayOffset;
+
+		void Init(intptr_t location)
+		{
+			this->location = location;
+			this->retSuccess = location + 10;
+			this->retFail = location + 30;
+
+			this->compositeBoundFlagsArrayOffset = *(uint32_t*)(location + 3);
+		}
+
+		void InternalMain() override
+		{
+			mov(rax, qword_ptr[rdx + this->compositeBoundFlagsArrayOffset]); // [original code]
+																			 //
+			test(rax, rax); // if ( flagArray )
+			jz("fail"); // {
+						//
+			mov(ecx, dword_ptr[rax + 4 /* hardcoded, hasn't changed */]); //        [original code]
+																		  //
+			mov(rax, retSuccess); //
+			jmp(rax); // }
+					  //
+			L("fail"); //
+					   //
+			mov(rax, retFail); //
+			jmp(rax); //
+		}
+	} patchStub;
+
+	patchStub.Init(reinterpret_cast<intptr_t>(location));
+	/**
+	 * nop's:
+	 *
+	 *    mov     rax, [rdx+90h]
+	 *    mov     [rax+4], ecx
+	 */
+	hook::nop(location, 10);
+	hook::jump(location, patchStub.GetCode());
+});