fix(windows): Bundle tessdata for OCR support out of the box

The Windows release was missing Tesseract OCR runtime dependencies
(tessdata files) needed for the HardSubx feature to work. Users had
to manually install Tesseract OCR and set TESSDATA_PREFIX.

Changes:
- Add get_executable_directory() to ocr.c that returns the directory
  containing the executable (works on Windows, Linux, and macOS)
- Update probe_tessdata_location() to search for tessdata in the
  executable directory, enabling bundled tessdata to be found
- Update release workflow to download eng.traineddata and osd.traineddata
  from tesseract-ocr/tessdata_fast during release builds
- Update WiX installer to include tessdata directory with the
  traineddata files

Now the Windows release includes tessdata files, and CCExtractor will
automatically find them in the installation directory without requiring
users to install Tesseract separately or set environment variables.

Fixes #1578

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.github/workflows/release.yml

@@ -81,6 +81,14 @@ jobs:
     - name: Copy files to directory for installer
       run: mkdir installer; cp ./x64/Release-Full/ccextractorwinfull.exe ./installer; cp ./x64/Release-Full/*.dll ./installer
       working-directory: ./windows
+    - name: Download tessdata for OCR support
+      run: |
+        mkdir -p ./installer/tessdata
+        # Download English traineddata from tessdata_fast (smaller, faster, good for most use cases)
+        Invoke-WebRequest -Uri "https://github.com/tesseract-ocr/tessdata_fast/raw/main/eng.traineddata" -OutFile "./installer/tessdata/eng.traineddata"
+        # Download OSD (Orientation and Script Detection) for automatic script detection
+        Invoke-WebRequest -Uri "https://github.com/tesseract-ocr/tessdata_fast/raw/main/osd.traineddata" -OutFile "./installer/tessdata/osd.traineddata"
+      working-directory: ./windows
     - name: install WiX
       run: dotnet tool uninstall --global wix; dotnet tool install --global wix --version 6.0.2 && wix extension add -g WixToolset.UI.wixext/6.0.2
     - name: Make sure WiX works

src/lib_ccx/ocr.c

@@ -8,6 +8,11 @@
 #include <dirent.h>
 #include "ccx_encoders_helpers.h"
 #include "ccx_encoders_spupng.h"
+#ifdef _WIN32
+#include <windows.h>
+#elif defined(__APPLE__)
+#include <mach-o/dyld.h>
+#endif
 #include "ocr.h"
 
 struct ocrCtx
@@ -100,6 +105,68 @@ void delete_ocr(void **arg)
 	freep(arg);
 }
 
+/**
+ * get_executable_directory
+ *
+ * Returns the directory containing the executable.
+ * Returns a pointer to a static buffer, or NULL on failure.
+ */
+static const char *get_executable_directory(void)
+{
+	static char exe_dir[1024] = {0};
+	static int initialized = 0;
+
+	if (initialized)
+		return exe_dir[0] ? exe_dir : NULL;
+
+	initialized = 1;
+
+#ifdef _WIN32
+	char exe_path[MAX_PATH];
+	DWORD len = GetModuleFileNameA(NULL, exe_path, MAX_PATH);
+	if (len == 0 || len >= MAX_PATH)
+		return NULL;
+
+	// Find the last backslash and truncate there
+	char *last_sep = strrchr(exe_path, '\\');
+	if (last_sep)
+	{
+		*last_sep = '\0';
+		strncpy(exe_dir, exe_path, sizeof(exe_dir) - 1);
+		exe_dir[sizeof(exe_dir) - 1] = '\0';
+	}
+#elif defined(__linux__)
+	char exe_path[1024];
+	ssize_t len = readlink("/proc/self/exe", exe_path, sizeof(exe_path) - 1);
+	if (len <= 0)
+		return NULL;
+	exe_path[len] = '\0';
+
+	char *last_sep = strrchr(exe_path, '/');
+	if (last_sep)
+	{
+		*last_sep = '\0';
+		strncpy(exe_dir, exe_path, sizeof(exe_dir) - 1);
+		exe_dir[sizeof(exe_dir) - 1] = '\0';
+	}
+#elif defined(__APPLE__)
+	char exe_path[1024];
+	uint32_t size = sizeof(exe_path);
+	if (_NSGetExecutablePath(exe_path, &size) != 0)
+		return NULL;
+
+	char *last_sep = strrchr(exe_path, '/');
+	if (last_sep)
+	{
+		*last_sep = '\0';
+		strncpy(exe_dir, exe_path, sizeof(exe_dir) - 1);
+		exe_dir[sizeof(exe_dir) - 1] = '\0';
+	}
+#endif
+
+	return exe_dir[0] ? exe_dir : NULL;
+}
+
 /**
  * probe_tessdata_location
  *
@@ -107,8 +174,10 @@ void delete_ocr(void **arg)
  *
  * Priority of Tesseract traineddata file search paths:-
  * 1. tessdata in TESSDATA_PREFIX, if it is specified. Overrides others
- * 2. tessdata in current working directory
- * 3. tessdata in /usr/share
+ * 2. tessdata in executable directory (for bundled tessdata)
+ * 3. tessdata in current working directory
+ * 4. tessdata in system locations (/usr/share, etc.)
+ * 5. tessdata in default Tesseract install location (Windows)
  */
 char *probe_tessdata_location(const char *lang)
 {
@@ -116,6 +185,7 @@ char *probe_tessdata_location(const char *lang)
 
 	const char *paths[] = {
 	    getenv("TESSDATA_PREFIX"),
+	    get_executable_directory(),
 	    "./",
 	    "/usr/share/",
 	    "/usr/local/share/",

windows/installer.wxs

@@ -4,6 +4,7 @@
 		<MediaTemplate EmbedCab="yes"/>
 		<Feature Id="CCX" Title="CCExtractor Setup" Level="1">
 			<ComponentGroupRef Id="CCX_Components_MainFolder"/>
+			<ComponentGroupRef Id="CCX_Components_tessdata"/>
 			<ComponentGroupRef Id="CCX_Components_MainFolder_data"/>
 			<ComponentGroupRef Id="CCX_Components_MainFolder_data_flutter_assets"/>
 			<ComponentGroupRef Id="CCX_Components_MainFolder_data_flutter_assets_assets"/>
@@ -40,6 +41,7 @@
     </StandardDirectory>
 		<StandardDirectory Id="ProgramFiles6432Folder">
 			<Directory Id="INSTALLFOLDER" Name="CCExtractor">
+				<Directory Id="CCX_tessdata" Name="tessdata"/>
 				<Directory Id="CCX_data" Name="data">
 					<Directory Id="CCX_data_flutter_assets" Name="flutter_assets">
 						<Directory Id="CCX_data_flutter_assets_assets" Name="assets"/>
@@ -194,6 +196,15 @@
 				<File Id="filWmUnmaximize" KeyPath="yes" Source="./installer/data/flutter_assets/packages/window_manager/images/ic_chrome_unmaximize.png"/>
 			</Component>
 		</ComponentGroup>
+		<!-- Tesseract OCR data files for HardSubx feature -->
+		<ComponentGroup Id="CCX_Components_tessdata" Directory="CCX_tessdata">
+			<Component Id="cmpTessdataEng" Guid="{A1234567-8901-2345-6789-0123456789AB}">
+				<File Id="filEngTraineddata" KeyPath="yes" Source="./installer/tessdata/eng.traineddata"/>
+			</Component>
+			<Component Id="cmpTessdataOsd" Guid="{B2345678-9012-3456-7890-123456789ABC}">
+				<File Id="filOsdTraineddata" KeyPath="yes" Source="./installer/tessdata/osd.traineddata"/>
+			</Component>
+		</ComponentGroup>
 	</Fragment>
 </Wix>