Add pattern scan, resolve issue #6 (#8)

zofrea1 · 0dm · web-flow · commit b9e5a8ca8390 · 2025-06-23T17:52:10.000-04:00
* Added pattern scan functionality to find the right offset, added optional logging, added option to disable forcing borderless window, commented out the code that used the manually found offset

* Clean up unused files

* Update src/dll/dllmain.c

Co-authored-by: Aaron &lt;57018940+0dm@users.noreply.github.com&gt;

* Update src/dll/dllmain.c

Co-authored-by: Aaron &lt;57018940+0dm@users.noreply.github.com&gt;

* Update src/dll/dllmain.c

Co-authored-by: Aaron &lt;57018940+0dm@users.noreply.github.com&gt;

* Update src/dll/dllmain.c

Co-authored-by: Aaron &lt;57018940+0dm@users.noreply.github.com&gt;

* Update src/dll/dllmain.c

Co-authored-by: Aaron &lt;57018940+0dm@users.noreply.github.com&gt;

* Update src/dll/build.bat

Co-authored-by: Aaron &lt;57018940+0dm@users.noreply.github.com&gt;

* Update src/dll/FPSconfig.ini

Co-authored-by: Aaron &lt;57018940+0dm@users.noreply.github.com&gt;

* Update src/dll/dllmain.c

Co-authored-by: Aaron &lt;57018940+0dm@users.noreply.github.com&gt;

* Update src/dll/dllmain.c

Co-authored-by: Aaron &lt;57018940+0dm@users.noreply.github.com&gt;

* Update dllmain.c

* Update dllmain.c

Get rid of the old hardcoded offset code that was commented out

* Add a dummy atexit command otherwise the build will fail if we want to include the -nostartfiles flag during compilation

---------

Co-authored-by: Aaron &lt;57018940+0dm@users.noreply.github.com&gt;
diff --git a/src/dll/FPSconfig.ini b/src/dll/FPSconfig.ini
@@ -1,7 +1,9 @@
 ; Config file for DS3DebugFPS
 
 [Settings]
-fps = 144.0	              ; FPS Cap
+fps = 75.0	              ; FPS Cap, ~82 and below resolves the slow sprinting issues that occur beyond this value
+EnableLogging = 1           ; Set to 1 to enable debug logging
+EnableBorderless = 1        ; Set to 1 to enable borderless window mode (default), 0 for normal window mode
 
 UseCustomScreenDimensions = 0 ; Set to 1 to change how the game is stretched, by default it will stretch the game to fit screen (optimal)
 
@@ -13,3 +15,4 @@ EnableCursorClip = 0       ; Set to 1 to enable the cursor clip hotkey, used to
 CursorClipHotkey = 0x7A    ; default: f11 (0x7A). You can still alt tab out of the window. This value is in hex.
 ; Hotkey list can be found here: https://docs.microsoft.com/en-us/windows/win32/inputdev/virtual-key-codes
 
+
diff --git a/src/dll/build.bat b/src/dll/build.bat
@@ -1,2 +1,2 @@
-@gcc -o D3DCompiler_43.dll asm.s dllmain.c -O3 -lmsvcrt -lntdll -shared -nostartfiles -Wno-multichar -Wl,--image-base,0x150000000,-e,DllMain
+@gcc -o D3DCompiler_43.dll asm.s dllmain.c -O3 -lmsvcrt -lntdll -lpsapi -nostartfiles -shared -Wno-multichar -Wl,--image-base,0x150000000,-e,DllMain
 @pause
diff --git a/src/dll/dllmain.c b/src/dll/dllmain.c
@@ -1,5 +1,8 @@
 #include "dllmain.h"
 #include "../../external/inih/ini.c"
+#include <stdio.h>
+#include <stdarg.h>
+#include <psapi.h>
 
 typedef struct {
   float fps;
@@ -8,6 +11,8 @@ typedef struct {
   int ScreenHeight;
   int EnableCursorClip;
   int CursorClipHotkey;
+  int EnableLogging;
+  int EnableBorderless;
 } config;
 config configFile;
 
@@ -25,7 +30,7 @@ static int handler(void *Settings, const char *section, const char *name, const
   config *modconfig = (config *)Settings;
   if (MATCH("Settings", "fps")) {
     modconfig->fps = atof(value);
-  }
+  } 
   if (MATCH("Settings", "UseCustomScreenDimensions")) {
     modconfig->UseCustomScreenDimensions = atoi(value);
   } else if (MATCH("Settings", "ScreenWidth")) {
@@ -36,57 +41,136 @@ static int handler(void *Settings, const char *section, const char *name, const
     modconfig->EnableCursorClip = atoi(value);
   } else if (MATCH("Settings", "CursorClipHotkey")) {
     modconfig->CursorClipHotkey = strtol(value, NULL, 16);
+  } else if (MATCH("Settings", "EnableLogging")) {
+    modconfig->EnableLogging = atoi(value);
+  } else if (MATCH("Settings", "EnableBorderless")) {
+    modconfig->EnableBorderless = atoi(value);
   } else
     return 0;
   return 1;
 }
 
 float readFile() {
-  return ini_parse("FPSconfig.ini", handler, &configFile) < 0 ? 1000 : configFile.fps; // will set framerate limit to 1000 if the ini file is missing
+  // Initialize config with default values
+  configFile.EnableLogging = 0;     // Default logging off
+  configFile.fps = 1000;            // Default FPS limit
+  configFile.EnableBorderless = 1;  // Default borderless enabled
+  
+  // Parse INI file, which will override defaults if present
+  if (ini_parse("FPSconfig.ini", handler, &configFile) < 0) {
+    return configFile.fps; // Return default if file is missing
+  }
+  return configFile.fps;
 }
 
-void setFps(float rFPS) {
+FILE* logFile = NULL;
+
+void log_init() {
+    if (!configFile.EnableLogging) return;
+    logFile = fopen("DS3DebugFPS_log.txt", "w");
+    if (logFile) {
+        fprintf(logFile, "[INFO] Log started\n");
+        fflush(logFile);
+    }
+    fclose(logFile);
+    logFile = fopen("DS3DebugFPS_log.txt", "a");
+}
+void log_close() {
+    if (!configFile.EnableLogging) return;
+    if (logFile) fclose(logFile);
+}
+void log_print(const char* fmt, ...) {
+    if (!configFile.EnableLogging || !logFile) return;
+    va_list args;
+    va_start(args, fmt);
+    vfprintf(logFile, fmt, args);
+    fprintf(logFile, "\n");
+    fflush(logFile);
+    va_end(args);
+}
 
+void setFps(float rFPS) {
+  log_print("[INFO] setFps called with rFPS = %f", rFPS);
   // Find Process
   DWORD PID;
   HWND hWnd = FindWindowA(NULL, "DARK SOULS III");
+  log_print("[INFO] FindWindowA returned HWND = %p", hWnd);
   GetWindowThreadProcessId(hWnd, &PID);
+  log_print("[INFO] GetWindowThreadProcessId returned PID = %lu", PID);
   HANDLE pHandle = OpenProcess(PROCESS_ALL_ACCESS, FALSE, PID);
+  log_print("[INFO] OpenProcess returned HANDLE = %p", pHandle);
 
   // Skip Intros 
   unsigned char SkipIntro[20] = {0x48, 0x31, 0xC0, 0x48, 0x89, 0x02, 0x49, 0x89, 0x04, 0x24, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90};
   NtWriteVirtualMemory(pHandle, (LPVOID)0x140BF66AE, SkipIntro, 20, 0);
 
-  // Borderless
-  if (configFile.UseCustomScreenDimensions != 1) {
-    final.right = GetSystemMetrics(SM_CXSCREEN);
-    final.bottom = GetSystemMetrics(SM_CYSCREEN);
-  } else {
-    final.right = configFile.ScreenWidth;
-    final.bottom = configFile.ScreenHeight;
+  // Borderless window mode (if enabled)
+  if (configFile.EnableBorderless) {
+    log_print("[INFO] Applying borderless window mode");
+    if (configFile.UseCustomScreenDimensions != 1) {
+      final.right = GetSystemMetrics(SM_CXSCREEN);
+      final.bottom = GetSystemMetrics(SM_CYSCREEN);
+    } else {
+      final.right = configFile.ScreenWidth;
+      final.bottom = configFile.ScreenHeight;
+    }
+    final.left = 0;
+    final.top = 0;
+    SetWindowLong(hWnd, GWL_STYLE, WS_POPUP | WS_VISIBLE);
+    AdjustWindowRect(&final, GetWindowLong(hWnd, GWL_STYLE), FALSE);
+    SetWindowLong(hWnd, GWL_EXSTYLE, (GetWindowLong(hWnd, GWL_EXSTYLE) | WS_EX_TOPMOST));
+    MoveWindow(hWnd, final.left, final.top, final.right - final.left, final.bottom - final.top, TRUE);
+    log_print("[INFO] Borderless window mode applied successfully");
   }
-  final.left = 0;
-  final.top = 0;
-  SetWindowLong(hWnd, GWL_STYLE, WS_POPUP | WS_VISIBLE);
-  AdjustWindowRect(&final, GetWindowLong(hWnd, GWL_STYLE), FALSE);
-  SetWindowLong(hWnd, GWL_EXSTYLE, (GetWindowLong(hWnd, GWL_EXSTYLE) | WS_EX_TOPMOST));
-  MoveWindow(hWnd, final.left, final.top, final.right - final.left, final.bottom - final.top, TRUE);
-
-  SprjFlipper = (DWORD64)GetModuleHandle("darksoulsiii.exe") + 0x489DD10;
   
-  // GRAPHICS -> GFX
-  NtReadVirtualMemory(pHandle, (LPVOID)SprjFlipper, &SprjFlipper, sizeof(SprjFlipper), NULL);
+  HMODULE hModule = GetModuleHandleA("darksoulsiii.exe");
+  log_print("[SCAN] Module base address: 0x%p", hModule);
 
-  // Debug FPS | デバッグFPS
-  NtWriteVirtualMemory(pHandle, (LPVOID)(SprjFlipper + 0x354), &rFPS, sizeof(DWORD), NULL);
+  BYTE sprjFlipperPattern1[] = { 0x50, 0x60, 0x3E, 0x08, 0xF4, 0x7F, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
+  BYTE sprjFlipperPattern2[] = { 0x50, 0x60, 0x3E, 0x08, 0xF3, 0x7F, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
+  const char* sprjFlipperMask = "xx??xxxxxxxxxxxx";
 
-  // Use Debug FPS | デバッグFPSを利用するか
-  NtWriteVirtualMemory(pHandle, (LPVOID)(SprjFlipper + 0x358), &useDebug, sizeof(char), NULL);
+  HMODULE scanModule = GetModuleHandleA("darksoulsiii.exe");
+  MODULEINFO moduleInfo;
+  if (GetModuleInformation(pHandle, scanModule, &moduleInfo, sizeof(moduleInfo))) {
+    BYTE* moduleBase = (BYTE*)moduleInfo.lpBaseOfDll;
+    DWORD moduleSize = moduleInfo.SizeOfImage;
+    size_t patternLen = strlen(sprjFlipperMask);
+    int foundCount = 0;
+    for (DWORD i = 0; i <= moduleSize - patternLen; ++i) {
+      BOOL found1 = TRUE, found2 = TRUE;
+      for (size_t j = 0; j < patternLen; ++j) {
+        if (sprjFlipperMask[j] == 'x') {
+          if (sprjFlipperPattern1[j] != moduleBase[i + j]) found1 = FALSE;
+          if (sprjFlipperPattern2[j] != moduleBase[i + j]) found2 = FALSE;
+        }
+      }
+      if (found1 || found2) {
+        foundCount++;
+        DWORD64 matchAddr = (DWORD64)(moduleBase + i);
+        log_print("[SCAN] Pattern %s match at: 0x%llx", found1 ? "F4" : "F3", matchAddr);
+        DWORD64 realSprjFlipper = 0;
+        NtReadVirtualMemory(pHandle, (LPVOID)matchAddr, &realSprjFlipper, sizeof(realSprjFlipper), NULL);
+        log_print("[PATCH] Read pointer at match: 0x%llx", realSprjFlipper);
+        NtWriteVirtualMemory(pHandle, (LPVOID)(realSprjFlipper + 0x354), &rFPS, sizeof(DWORD), NULL);
+        log_print("[PATCH] Patched rFPS at: 0x%llx", realSprjFlipper + 0x354);
+        NtWriteVirtualMemory(pHandle, (LPVOID)(realSprjFlipper + 0x358), &useDebug, sizeof(char), NULL);
+        log_print("[PATCH] Patched useDebug at: 0x%llx", realSprjFlipper + 0x358);
+        break;
+      }
+    }
+    if (foundCount == 0) {
+      log_print("[SCAN] No matching patterns found in module.");
+    } else {
+      log_print("[SCAN] Successfully patched FPS and useDebug values.");
+    }
+  } else {
+    log_print("[SCAN] Failed to get module information for scan.");
+  }
 
   if (configFile.EnableCursorClip != 0) {
-
-    // createthread for an asynchronous loop
     HANDLE thread = CreateThread(NULL, 0, (void *)containCursor, &hWnd, 0, NULL);
+    log_print("[INFO] Cursor clip thread created.");
   }
 }
 
@@ -99,6 +183,8 @@ BOOL WINAPI DllMain(HINSTANCE baseaddr, DWORD reason, BOOL isstatic) {
     while (BaseFileName-- > FullFilePath)
       if (*BaseFileName == L'\\')
         break;
+    readFile();
+    log_init();
   case DLL_THREAD_ATTACH:
     break;
   }
@@ -131,3 +217,6 @@ importD3D(FARPROC D3DAssemble_, DebugSetMute_, D3DCompile_, D3DCompressShaders_,
     setFps(readFile());
   }
 }
+
+// Dummy atexit implementation for -nostartfiles builds
+int atexit(void (*func)(void)) { return 0; }

Original file line number	Diff line number	Diff line change
`@@ -1,2 +1,2 @@`
`1`		`-@gcc -o D3DCompiler_43.dll asm.s dllmain.c -O3 -lmsvcrt -lntdll -shared -nostartfiles -Wno-multichar -Wl,--image-base,0x150000000,-e,DllMain`
	`1`	`+@gcc -o D3DCompiler_43.dll asm.s dllmain.c -O3 -lmsvcrt -lntdll -lpsapi -nostartfiles -shared -Wno-multichar -Wl,--image-base,0x150000000,-e,DllMain`
`2`	`2`	`@pause`