Dummy patch dll to start things rolling.

.gitignore

@@ -26,3 +26,7 @@ out/
 *.lai
 *.la
 *.a
+*.lib
+
+# Library generated exports
+*.exp

Projects/CoX/Clients/CMakeLists.txt

@@ -0,0 +1 @@
+add_subdirectory(Client_I0)

Projects/CoX/Clients/Client_I0/CMakeLists.txt

@@ -0,0 +1,19 @@
+LINK_DIRECTORIES(../patch_tools)
+set (CMAKE_CXX_STANDARD 17)
+if (MSVC_VERSION GREATER_EQUAL "1900")
+    include(CheckCXXCompilerFlag)
+    CHECK_CXX_COMPILER_FLAG("/std:c++latest" _cpp_latest_flag_supported)
+    if (_cpp_latest_flag_supported)
+        add_compile_options("/std:c++latest")
+    endif()
+endif()
+set(SOURCES
+    utils/dll_patcher.cpp
+    patch_all_the_things.cpp
+    dll_core.cpp
+)
+add_library(cohdll SHARED ${SOURCES})
+# we link to the imp lib for the exe
+target_link_libraries(cohdll CityOfPatches)
+# enforce the dll prefix.
+SET_TARGET_PROPERTIES(cohdll PROPERTIES PREFIX "lib")

Projects/CoX/Clients/Client_I0/dll_core.cpp

@@ -0,0 +1,35 @@
+#include "patch_all_the_things.h"
+
+#include <stdio.h>
+#include <windows.h>
+
+HMODULE coh_instance;
+extern "C" {
+BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved) {
+
+    switch (fdwReason)
+    {
+    case DLL_PROCESS_ATTACH:
+        printf ("CoH Patch dll loaded\n");
+        coh_instance = GetModuleHandle(nullptr);
+        patch_all_the_things();
+        break;
+
+    case DLL_PROCESS_DETACH:
+        printf ("Unload working...\n");
+        break;
+
+    case DLL_THREAD_ATTACH:
+        printf ("Thread attach ???\n");
+        break;
+
+    case DLL_THREAD_DETACH:
+        printf ("Thread detach ??\n");
+        break;
+    }
+    return TRUE;
+}
+__declspec(dllexport) int test() {
+    return 0;
+}
+}

Projects/CoX/Clients/Client_I0/patch_all_the_things.cpp

@@ -0,0 +1,7 @@
+#include "patch_all_the_things.h"
+#include "utils/dll_patcher.h"
+// extern patch_named_module()
+void patch_all_the_things()
+{
+	//patch_named_module()
+}

Projects/CoX/Clients/Client_I0/utils/dll_patcher.cpp

@@ -0,0 +1,28 @@
+#include "dll_patcher.h"
+
+#include <stdio.h>
+#include <stdint.h>
+#include <windows.h>
+#include <cassert>
+void break_me() 
+{
+    assert(false);
+}
+
+extern HMODULE coh_instance;
+void patchit(const char *tgt,void *proc) 
+{
+    uint8_t *addr = (uint8_t *)GetProcAddress(coh_instance,tgt);
+    DWORD offset = ((DWORD)proc - (DWORD)addr - 5);
+    if(addr) 
+	{
+        *addr = 0xE9; // write JMP
+        *(DWORD *)(addr+1) = (DWORD)offset; // write target offset
+        printf("Patched %s\n",tgt);
+    } 
+	else 
+	{
+        printf("Couldn't patch %s\n",tgt);
+        abort();
+    }
+}