refactor: Soundbank runtime hooking improvement

> change default behaviour to pattern based patch for hooks::soundbank, see #13 > fix broken check for hooks::soundbank unsupported game version
2026-02-17 19:30:01 +09:00
parent 97cca85bc8
commit 82439962d6
3 changed files with 108 additions and 35 deletions
@@ -249,3 +249,52 @@ bool get_pe_identifier(const std::filesystem::path& dll_path, uint32_t* time_dat

    return true;
 }
+
+intptr_t find_asm_leacstr_from(HMODULE module, reg_t reg, const char *cstr)
+{
+    // get module information
+    MODULEINFO module_info{};
+    if (!GetModuleInformation(GetCurrentProcess(), module, &module_info, sizeof(module_info)))
+    {
+        return 0;
+    }
+    const unsigned char *modbegp = reinterpret_cast<unsigned char *>(module);
+    const unsigned char *modendp = reinterpret_cast<unsigned char *>(module) + static_cast<size_t>(module_info.SizeOfImage);
+
+    // search cstr
+    const unsigned char *cstr_addr = std::search(
+            modbegp,
+            modendp,
+            reinterpret_cast<const unsigned char *>(cstr),
+            reinterpret_cast<const unsigned char *>(cstr) + strlen(cstr)
+    );
+    if (cstr_addr == modendp)
+    {
+        return 0;
+    }
+
+#if defined(__i386__)
+    // find LEA REG, [abs32]
+    unsigned char asmop[6] = { 0x8D, reg.v, 0x00, 0x00, 0x00, 0x00};
+    int32_t dist32 = reinterpret_cast<int32_t>(cstr_addr);
+    memcpy(asmop + (sizeof(asmop) - 4), &dist32, 4);
+    return reinterpret_cast<intptr_t>(std::search(
+            modbegp,
+            modendp,
+            asmop,
+            asmop + sizeof(asmop)
+    ));
+#elif defined(__x86_64__)
+    // find LEA REG, [RIP + rel32]
+    unsigned char rex = reg.t == GPR_EXT ? 0x4C : 0x48;
+    unsigned char asmop[7] = {rex, 0x8D, reg.v, 0x00, 0x00, 0x00, 0x00};
+    for (const unsigned char *addr = modbegp; addr < modendp - sizeof(asmop); addr++)
+    {
+        auto dist32 = static_cast<int32_t>(reinterpret_cast<intptr_t>(cstr_addr) - reinterpret_cast<intptr_t>(addr + sizeof(asmop)));
+        memcpy(asmop + (sizeof(asmop) - 4), &dist32, 4);
+        if (memcmp(addr, asmop, sizeof(asmop)) == 0) return reinterpret_cast<intptr_t>(addr);
+    }
+#endif
+
+    return 0;
+}