1 files changed, 219 insertions, 0 deletions

diff --git a/src/thmviewer/load.cpp b/src/thmviewer/load.cpp
new file mode 100644
index 00000000..cd48caff
--- /dev/null
+++ b/src/thmviewer/load.cpp
@@ -0,0 +1,219 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+
+#include "precomp.h"
+
+struct LOAD_THREAD_CONTEXT
+{
+    HWND hWnd;
+    LPCWSTR wzThemePath;
+    LPCWSTR wzWxlPath;
+
+    HANDLE hInit;
+};
+
+static DWORD WINAPI LoadThreadProc(
+    __in LPVOID pvContext
+    );
+
+
+extern "C" HRESULT LoadStart(
+    __in_z LPCWSTR wzThemePath,
+    __in_z_opt LPCWSTR wzWxlPath,
+    __in HWND hWnd,
+    __out HANDLE* phThread
+    )
+{
+    HRESULT hr = S_OK;
+    HANDLE rgHandles[2] = { };
+    LOAD_THREAD_CONTEXT context = { };
+
+    rgHandles[0] = ::CreateEventW(NULL, TRUE, FALSE, NULL);
+    ExitOnNullWithLastError(rgHandles[0], hr, "Failed to create load init event.");
+
+    context.hWnd = hWnd;
+    context.wzThemePath = wzThemePath;
+    context.wzWxlPath = wzWxlPath;
+    context.hInit = rgHandles[0];
+
+    rgHandles[1] = ::CreateThread(NULL, 0, LoadThreadProc, &context, 0, NULL);
+    ExitOnNullWithLastError(rgHandles[1], hr, "Failed to create load thread.");
+
+    ::WaitForMultipleObjects(countof(rgHandles), rgHandles, FALSE, INFINITE);
+
+    *phThread = rgHandles[1];
+    rgHandles[1] = NULL;
+
+LExit:
+    ReleaseHandle(rgHandles[1]);
+    ReleaseHandle(rgHandles[0]);
+    return hr;
+}
+
+
+static DWORD WINAPI LoadThreadProc(
+    __in LPVOID pvContext
+    )
+{
+    HRESULT hr = S_OK;
+    WIX_LOCALIZATION* pWixLoc = NULL;
+    LPWSTR sczThemePath = NULL;
+    LPWSTR sczWxlPath = NULL;
+    BOOL fComInitialized = FALSE;
+    HANDLE hDirectory = INVALID_HANDLE_VALUE;
+    LPWSTR sczDirectory = NULL;
+    LPWSTR wzFileName = NULL;
+
+    THEME* pTheme = NULL;
+    HANDLE_THEME* pHandle = NULL;
+
+    LOAD_THREAD_CONTEXT* pContext = static_cast<LOAD_THREAD_CONTEXT*>(pvContext);
+    HWND hWnd = pContext->hWnd;
+
+    hr = StrAllocString(&sczThemePath, pContext->wzThemePath, 0);
+    ExitOnFailure(hr, "Failed to copy path to initial theme file.");
+
+    if (pContext->wzWxlPath)
+    {
+        hr = StrAllocString(&sczWxlPath, pContext->wzWxlPath, 0);
+        ExitOnFailure(hr, "Failed to copy .wxl path to initial file.");
+    }
+
+    // We can signal the initialization event as soon as we have copied the context
+    // values into local variables.
+    ::SetEvent(pContext->hInit);
+
+    hr = ::CoInitialize(NULL);
+    ExitOnFailure(hr, "Failed to initialize COM on load thread.");
+    fComInitialized = TRUE;
+
+    // Open a handle to the directory so we can put a notification on it.
+    hr = PathGetDirectory(sczThemePath, &sczDirectory);
+    ExitOnFailure(hr, "Failed to get path directory.");
+
+    wzFileName = PathFile(sczThemePath);
+
+    hDirectory = ::CreateFileW(sczDirectory, FILE_LIST_DIRECTORY, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, NULL);
+    if (INVALID_HANDLE_VALUE == hDirectory)
+    {
+        ExitWithLastError(hr, "Failed to open directory: %ls", sczDirectory);
+    }
+
+    BOOL fUpdated = FALSE;
+    do
+    {
+        // Get the last modified time on the file we're loading for verification that the
+        // file actually gets changed down below.
+        FILETIME ftModified = { };
+        FileGetTime(sczThemePath, NULL, NULL, &ftModified);
+
+        // Try to load the theme file.
+        hr = ThemeLoadFromFile(sczThemePath, &pTheme);
+        if (FAILED(hr))
+        {
+            ::SendMessageW(hWnd, WM_THMVWR_THEME_LOAD_ERROR, 0, hr);
+        }
+        else
+        {
+            if (sczWxlPath)
+            {
+                hr = LocLoadFromFile(sczWxlPath, &pWixLoc);
+                ExitOnFailure(hr, "Failed to load loc file from path: %ls", sczWxlPath);
+
+                hr = ThemeLocalize(pTheme, pWixLoc);
+                ExitOnFailure(hr, "Failed to localize theme: %ls", sczWxlPath);
+            }
+
+            hr = AllocHandleTheme(pTheme, &pHandle);
+            ExitOnFailure(hr, "Failed to allocate handle to theme");
+
+            ::SendMessageW(hWnd, WM_THMVWR_NEW_THEME, 0, reinterpret_cast<LPARAM>(pHandle));
+            pHandle = NULL;
+        }
+
+        fUpdated = FALSE;
+        do
+        {
+            DWORD rgbNotifications[1024];
+            DWORD cbRead = 0;
+            if (!::ReadDirectoryChangesW(hDirectory, rgbNotifications, sizeof(rgbNotifications), FALSE, FILE_NOTIFY_CHANGE_LAST_WRITE, &cbRead, NULL, NULL))
+            {
+                ExitWithLastError(hr, "Failed while watching directory: %ls", sczDirectory);
+            }
+
+            // Wait for half a second to let all the file handles get closed to minimize access
+            // denied errors.
+            ::Sleep(500);
+
+            FILE_NOTIFY_INFORMATION* pNotification = reinterpret_cast<FILE_NOTIFY_INFORMATION*>(rgbNotifications);
+            while (pNotification)
+            {
+                // If our file was updated, check to see if the modified time really changed. The notifications
+                // are often trigger happy thinking the file changed two or three times in a row. Maybe it's AV
+                // software creating the problems but actually checking the modified date works well.
+                if (CSTR_EQUAL == ::CompareStringW(LOCALE_NEUTRAL, NORM_IGNORECASE, pNotification->FileName, pNotification->FileNameLength / sizeof(WCHAR), wzFileName, -1))
+                {
+                    FILETIME ft = { };
+                    FileGetTime(sczThemePath, NULL, NULL, &ft);
+
+                    fUpdated = (ftModified.dwHighDateTime < ft.dwHighDateTime) || (ftModified.dwHighDateTime == ft.dwHighDateTime && ftModified.dwLowDateTime < ft.dwLowDateTime);
+                    break;
+                }
+
+                pNotification = pNotification->NextEntryOffset ? reinterpret_cast<FILE_NOTIFY_INFORMATION*>(reinterpret_cast<BYTE*>(pNotification) + pNotification->NextEntryOffset) : NULL;
+            }
+        } while (!fUpdated);
+    } while(fUpdated);
+
+LExit:
+    if (fComInitialized)
+    {
+        ::CoUninitialize();
+    }
+
+    LocFree(pWixLoc);
+    ReleaseFileHandle(hDirectory);
+    ReleaseStr(sczDirectory);
+    ReleaseStr(sczThemePath);
+    ReleaseStr(sczWxlPath);
+    return hr;
+}
+
+extern "C" HRESULT AllocHandleTheme(
+    __in THEME* pTheme,
+    __out HANDLE_THEME** ppHandle
+    )
+{
+    HRESULT hr = S_OK;
+    HANDLE_THEME* pHandle = NULL;
+
+    pHandle = static_cast<HANDLE_THEME*>(MemAlloc(sizeof(HANDLE_THEME), TRUE));
+    ExitOnNull(pHandle, hr, E_OUTOFMEMORY, "Failed to allocate theme handle.");
+
+    pHandle->cReferences = 1;
+    pHandle->pTheme = pTheme;
+
+    *ppHandle = pHandle;
+    pHandle = NULL;
+
+LExit:
+    ReleaseMem(pHandle);
+    return hr;
+}
+
+extern "C" void IncrementHandleTheme(
+    __in HANDLE_THEME* pHandle
+    )
+{
+    ::InterlockedIncrement(reinterpret_cast<LONG*>(&pHandle->cReferences));
+}
+
+extern "C"  void DecrementHandleTheme(
+    __in HANDLE_THEME* pHandle
+    )
+{
+    if (pHandle && 0 == ::InterlockedDecrement(reinterpret_cast<LONG*>(&pHandle->cReferences)))
+    {
+        ThemeFree(pHandle->pTheme);
+        MemFree(pHandle);
+    }
+}