1 files changed, 51 insertions, 0 deletions

diff --git a/src/core/re3.cpp b/src/core/re3.cpp
index 0301a98a..137a890c 100644
--- a/src/core/re3.cpp
+++ b/src/core/re3.cpp
@@ -22,11 +22,62 @@
 #include "Console.h"
 #include "Debug.h"
 
+#include <algorithm>
 #include <vector>
 #include <list>
 
 std::vector<int32> usedAddresses;
 
+static DWORD protect[2];
+static uint32 protect_address;
+static uint32 protect_size;
+
+void
+Protect_internal(uint32 address, uint32 size)
+{
+	protect_address = address;
+	protect_size = size;
+	VirtualProtect((void*)address, size, PAGE_EXECUTE_READWRITE, &protect[0]);
+}
+
+void
+Unprotect_internal(void)
+{
+	VirtualProtect((void*)protect_address, protect_size, protect[0], &protect[1]);
+}
+
+void
+InjectHook_internal(uint32 address, uint32 hook, int type)
+{
+	if(std::any_of(usedAddresses.begin(), usedAddresses.end(),
+	               [address](uint32 value) { return (int32)value == address; })) {
+		debug("Used address %#06x twice when injecting hook\n", address);
+	}
+
+	usedAddresses.push_back((int32)address);
+
+
+	switch(type){
+	case PATCH_JUMP:
+		VirtualProtect((void*)address, 5, PAGE_EXECUTE_READWRITE, &protect[0]);
+		*(uint8*)address = 0xE9;
+		break;
+	case PATCH_CALL:
+		VirtualProtect((void*)address, 5, PAGE_EXECUTE_READWRITE, &protect[0]);
+		*(uint8*)address = 0xE8;
+		break;
+	default:
+		VirtualProtect((void*)((uint32)address + 1), 4, PAGE_EXECUTE_READWRITE, &protect[0]);
+		break;
+	}
+
+	*(ptrdiff_t*)(address + 1) = hook - address - 5;
+	if(type == PATCH_NOTHING)
+		VirtualProtect((void*)(address + 1), 4, protect[0], &protect[1]);
+	else
+		VirtualProtect((void*)address, 5, protect[0], &protect[1]);
+}
+
 void **rwengine = *(void***)0x5A10E1;
 
 DebugMenuAPI gDebugMenuAPI;