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dllmain.cpp

@@ -0,0 +1,62 @@
+#include <Windows.h>
+#include "detours.h"
+#include <stdio.h>
+
+char* to_utf8(char* target, const char* source, UINT cp) {
+    int count = MultiByteToWideChar(cp, MB_ERR_INVALID_CHARS, source, -1, NULL, 0);
+    if (!count) return nullptr;
+    WCHAR* ws = new WCHAR[count + 1];
+    MultiByteToWideChar(cp, MB_ERR_INVALID_CHARS, source, -1, ws, count);
+    char* result = nullptr;
+    int ncount = WideCharToMultiByte(CP_UTF8, 0, ws, -1, nullptr, 0, nullptr, nullptr);
+    if (ncount) {
+        if (!target) {
+            target = new char[ncount + 1];
+        }
+        result = target;
+        WideCharToMultiByte(CP_UTF8, 0, ws, -1, result, ncount, nullptr, nullptr);
+    }
+    delete[] ws;
+    return result;
+}
+
+char* WINAPI jis_to_utf8(char* target, const char* source) {
+    char* result = to_utf8(target, source, CP_UTF8);
+    if (!result) {
+        result = to_utf8(target, source, 932);
+    }
+    return result;
+}
+
+PVOID GetHandle() {
+    HMODULE hModule = GetModuleHandleA(NULL);
+    return (char*)hModule + 0xf3c20;
+}
+
+extern "C" __declspec(dllexport) void Attach() {
+    DetourTransactionBegin();
+    DetourUpdateThread(GetCurrentThread());
+    PVOID h = GetHandle();
+    DetourAttach(&h, (PVOID)jis_to_utf8);
+    DetourTransactionCommit();
+}
+
+extern "C" __declspec(dllexport) void Detach() {
+    DetourTransactionBegin();
+    DetourUpdateThread(GetCurrentThread());
+    PVOID h = GetHandle();
+    DetourDetach(&h, (PVOID)jis_to_utf8);
+    DetourTransactionCommit();
+}
+
+BOOL APIENTRY DllMain(HMODULE hModule, DWORD reason, LPVOID rev) {
+    switch (reason) {
+    case DLL_PROCESS_ATTACH:
+        Attach();
+        break;
+    case DLL_PROCESS_DETACH:
+        Detach();
+        break;
+    }
+    return TRUE;
+}