Refactor: Move supported extensions to shared constants file

- Move extension list and validation function to ImageResizerConstants.h
- Eliminate code duplication between MSI and MSIX handlers
- Single source of truth for supported extensions

Co-authored-by: yeelam-gordon <73506701+yeelam-gordon@users.noreply.github.com>

src/modules/imageresizer/ImageResizerContextMenu/dllmain.cpp

@@ -6,8 +6,6 @@
 #include <Shlwapi.h>
 #include <shobjidl_core.h>
 #include <string>
-#include <algorithm>
-#include <vector>
 
 #include <common/telemetry/EtwTrace/EtwTrace.h>
 #include <common/utils/elevation.h>
@@ -15,6 +13,7 @@
 #include <common/utils/resources.h>
 #include <Settings.h>
 #include <trace.h>
+#include <ImageResizerConstants.h>
 
 #include <wil/win32_helpers.h>
 #include <wrl/module.h>
@@ -27,28 +26,6 @@ Shared::Trace::ETWTrace trace(L"ImageResizerContextMenu");
 
 #define BUFSIZE 4096 * 4
 
-// List of supported image extensions that Image Resizer can process
-// This must match the list in RuntimeRegistration.h
-static const std::vector<std::wstring> g_supportedExtensions = {
-    L".bmp", L".dib", L".gif", L".jfif", L".jpe", L".jpeg", L".jpg", 
-    L".jxr", L".png", L".rle", L".tif", L".tiff", L".wdp"
-};
-
-// Helper function to check if a file extension is supported by Image Resizer
-static bool IsSupportedImageExtension(LPCWSTR extension)
-{
-    if (nullptr == extension || wcslen(extension) == 0)
-    {
-        return false;
-    }
-
-    // Convert to lowercase for case-insensitive comparison
-    std::wstring ext(extension);
-    std::transform(ext.begin(), ext.end(), ext.begin(), ::towlower);
-
-    return std::find(g_supportedExtensions.begin(), g_supportedExtensions.end(), ext) != g_supportedExtensions.end();
-}
-
 BOOL APIENTRY DllMain( HMODULE hModule,
                        DWORD  ul_reason_for_call,
                        LPVOID lpReserved
@@ -147,7 +124,7 @@ public:
         // Check if the extension is actually supported by Image Resizer
         // This prevents showing the menu for file types like .psd that Windows
         // perceives as images but Image Resizer cannot process
-        if (!IsSupportedImageExtension(pszExt))
+        if (!ImageResizerConstants::IsSupportedImageExtension(pszExt))
         {
             CoTaskMemFree(pszPath);
             *cmdState = ECS_HIDDEN;

src/modules/imageresizer/ImageResizerLib/ImageResizerConstants.h

@@ -1,5 +1,7 @@
 #pragma once
 #include <string>
+#include <vector>
+#include <algorithm>
 
 namespace ImageResizerConstants
 {
@@ -10,4 +12,26 @@ namespace ImageResizerConstants
     inline const std::wstring ModuleOldSaveFolderKey = L"ImageResizer";
     inline const std::wstring ModuleSaveFolderKey = L"Image Resizer";
     inline const std::wstring ModulePackageDisplayName = L"ImageResizerContextMenu";
+
+    // List of supported image extensions that Image Resizer can process
+    // This must match the list in RuntimeRegistration.h
+    inline const std::vector<std::wstring> SupportedImageExtensions = {
+        L".bmp", L".dib", L".gif", L".jfif", L".jpe", L".jpeg", L".jpg", 
+        L".jxr", L".png", L".rle", L".tif", L".tiff", L".wdp"
+    };
+
+    // Helper function to check if a file extension is supported by Image Resizer
+    inline bool IsSupportedImageExtension(LPCWSTR extension)
+    {
+        if (nullptr == extension || wcslen(extension) == 0)
+        {
+            return false;
+        }
+
+        // Convert to lowercase for case-insensitive comparison
+        std::wstring ext(extension);
+        std::transform(ext.begin(), ext.end(), ext.begin(), ::towlower);
+
+        return std::find(SupportedImageExtensions.begin(), SupportedImageExtensions.end(), ext) != SupportedImageExtensions.end();
+    }
 }

src/modules/imageresizer/dll/ContextMenuHandler.cpp

@@ -5,6 +5,7 @@
 
 #include <Settings.h>
 #include <trace.h>
+#include <ImageResizerConstants.h>
 
 #include <common/themes/icon_helpers.h>
 #include <common/utils/process_path.h>
@@ -12,34 +13,8 @@
 #include <common/utils/HDropIterator.h>
 #include <common/utils/package.h>
 
-#include <algorithm>
-#include <vector>
-#include <string>
-
 extern HINSTANCE g_hInst_imageResizer;
 
-// List of supported image extensions that Image Resizer can process
-// This must match the list in RuntimeRegistration.h
-static const std::vector<std::wstring> g_supportedExtensions = {
-    L".bmp", L".dib", L".gif", L".jfif", L".jpe", L".jpeg", L".jpg", 
-    L".jxr", L".png", L".rle", L".tif", L".tiff", L".wdp"
-};
-
-// Helper function to check if a file extension is supported by Image Resizer
-static bool IsSupportedImageExtension(LPCWSTR extension)
-{
-    if (nullptr == extension || wcslen(extension) == 0)
-    {
-        return false;
-    }
-
-    // Convert to lowercase for case-insensitive comparison
-    std::wstring ext(extension);
-    std::transform(ext.begin(), ext.end(), ext.begin(), ::towlower);
-
-    return std::find(g_supportedExtensions.begin(), g_supportedExtensions.end(), ext) != g_supportedExtensions.end();
-}
-
 CContextMenuHandler::CContextMenuHandler()
 {
     m_pidlFolder = NULL;
@@ -126,7 +101,7 @@ HRESULT CContextMenuHandler::QueryContextMenu(_In_ HMENU hmenu, UINT indexMenu,
     // Check if the extension is actually supported by Image Resizer
     // This prevents showing the menu for file types like .psd that Windows
     // perceives as images but Image Resizer cannot process
-    if (!IsSupportedImageExtension(pszExt))
+    if (!ImageResizerConstants::IsSupportedImageExtension(pszExt))
     {
         free(pszPath);
         return S_OK;
@@ -455,7 +430,7 @@ HRESULT __stdcall CContextMenuHandler::GetState(IShellItemArray* psiItemArray, B
     // Check if the extension is actually supported by Image Resizer
     // This prevents showing the menu for file types like .psd that Windows
     // perceives as images but Image Resizer cannot process
-    if (!IsSupportedImageExtension(pszExt))
+    if (!ImageResizerConstants::IsSupportedImageExtension(pszExt))
     {
         CoTaskMemFree(pszPath);
         *pCmdState = ECS_HIDDEN;