[SHELL32] Optimize change notification (#3030)

- Keep the directory lists only.
- Don't remember file sizes and normal file paths.
CORE-13950

dll/win32/shell32/shelldesktop/CDirectoryList.cpp

@@ -0,0 +1,122 @@
+/*
+ * PROJECT:     shell32
+ * LICENSE:     LGPL-2.1-or-later (https://spdx.org/licenses/LGPL-2.1-or-later)
+ * PURPOSE:     Shell change notification
+ * COPYRIGHT:   Copyright 2020 Katayama Hirofumi MZ (katayama.hirofumi.mz@gmail.com)
+ */
+#include "shelldesktop.h"
+#include "CDirectoryList.h"
+#include <assert.h>      // for assert
+
+WINE_DEFAULT_DEBUG_CHANNEL(shcn);
+
+BOOL CDirectoryList::ContainsPath(LPCWSTR pszPath) const
+{
+    assert(!PathIsRelativeW(pszPath));
+
+    for (INT i = 0; i < m_items.GetSize(); ++i)
+    {
+        if (m_items[i].IsEmpty())
+            continue;
+
+        if (m_items[i].EqualPath(pszPath))
+            return TRUE; // matched
+    }
+    return FALSE;
+}
+
+BOOL CDirectoryList::AddPath(LPCWSTR pszPath)
+{
+    assert(!PathIsRelativeW(pszPath));
+    return m_items.Add(pszPath);
+}
+
+BOOL CDirectoryList::RenamePath(LPCWSTR pszPath1, LPCWSTR pszPath2)
+{
+    assert(!PathIsRelativeW(pszPath1));
+    assert(!PathIsRelativeW(pszPath2));
+
+    for (INT i = 0; i < m_items.GetSize(); ++i)
+    {
+        if (m_items[i].EqualPath(pszPath1))
+        {
+            // matched
+            m_items[i].SetPath(pszPath2);
+            return TRUE;
+        }
+    }
+    return FALSE;
+}
+
+BOOL CDirectoryList::DeletePath(LPCWSTR pszPath)
+{
+    assert(!PathIsRelativeW(pszPath));
+
+    for (INT i = 0; i < m_items.GetSize(); ++i)
+    {
+        if (m_items[i].EqualPath(pszPath))
+        {
+            // matched
+            m_items[i].SetPath(NULL);
+            return TRUE;
+        }
+    }
+    return FALSE;
+}
+
+BOOL CDirectoryList::AddPathsFromDirectory(LPCWSTR pszDirectoryPath)
+{
+    // get the full path
+    WCHAR szPath[MAX_PATH];
+    lstrcpynW(szPath, pszDirectoryPath, _countof(szPath));
+    assert(!PathIsRelativeW(szPath));
+
+    // is it a directory?
+    if (!PathIsDirectoryW(szPath))
+        return FALSE;
+
+    // add the path
+    if (!AddPath(szPath))
+        return FALSE;
+
+    // enumerate the file items to remember
+    PathAppendW(szPath, L"*");
+    WIN32_FIND_DATAW find;
+    HANDLE hFind = FindFirstFileW(szPath, &find);
+    if (hFind == INVALID_HANDLE_VALUE)
+    {
+        ERR("FindFirstFileW failed\n");
+        return FALSE;
+    }
+
+    LPWSTR pch;
+    do
+    {
+        // ignore "." and ".."
+        pch = find.cFileName;
+        if (pch[0] == L'.' && (pch[1] == 0 || (pch[1] == L'.' && pch[2] == 0)))
+            continue;
+
+        // build a path
+        PathRemoveFileSpecW(szPath);
+        if (lstrlenW(szPath) + lstrlenW(find.cFileName) + 1 > MAX_PATH)
+        {
+            ERR("szPath is too long\n");
+            continue;
+        }
+        PathAppendW(szPath, find.cFileName);
+
+        // add the path and do recurse
+        if (find.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
+        {
+            if (m_fRecursive)
+                AddPathsFromDirectory(szPath);
+            else
+                AddPath(szPath);
+        }
+    } while (FindNextFileW(hFind, &find));
+
+    FindClose(hFind);
+
+    return TRUE;
+}