Un-duplicate EvictFileFromSystemCache....

base/test_file_util_win.cc

+// Copyright (c) 2008 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "base/test_file_util.h"
+
+#include <windows.h>
+
+#include <vector>
+
+#include "base/file_util.h"
+
+namespace file_util {
+
+bool EvictFileFromSystemCache(const wchar_t* file) {
+  // Request exclusive access to the file and overwrite it with no buffering.
+  win_util::ScopedHandle hfile(
+      CreateFile(file, GENERIC_READ | GENERIC_WRITE, 0, NULL,
+                 OPEN_EXISTING, FILE_FLAG_NO_BUFFERING,
+                 NULL));
+  if (!hfile)
+    return false;
+
+  // Execute in chunks. It could be optimized. We want to do few of these since
+  // these opterations will be slow without the cache.
+  char buffer[4096];
+  int total_bytes = 0;
+  DWORD bytes_read;
+  for (;;) {
+    bytes_read = 0;
+    ReadFile(hfile, buffer, sizeof(buffer), &bytes_read, NULL);
+    if (bytes_read == 0)
+      break;
+
+    SetFilePointer(hfile, total_bytes, 0, FILE_BEGIN);
+    if (!WriteFile(hfile, buffer, bytes_read, &bytes_read, NULL))
+      return false;
+    total_bytes += bytes_read;
+  }
+  return true;
+}
+
+// Like CopyFileNoCache but recursively copies all files and subdirectories
+// in the given input directory to the output directory.
+bool CopyRecursiveDirNoCache(const std::wstring& source_dir,
+                             const std::wstring& dest_dir) {
+  // Try to create the directory if it doesn't already exist.
+  if (!CreateDirectory(dest_dir)) {
+    if (GetLastError() != ERROR_ALREADY_EXISTS)
+      return false;
+  }
+
+  std::vector<std::wstring> files_copied;
+
+  std::wstring src(source_dir);
+  file_util::AppendToPath(&src, L"*");
+
+  WIN32_FIND_DATA fd;
+  HANDLE fh = FindFirstFile(src.c_str(), &fd);
+  if (fh == INVALID_HANDLE_VALUE)
+    return false;
+
+  do {
+    std::wstring cur_file(fd.cFileName);
+    if (cur_file == L"." || cur_file == L"..")
+      continue;  // Skip these special entries.
+
+    std::wstring cur_source_path(source_dir);
+    file_util::AppendToPath(&cur_source_path, cur_file);
+
+    std::wstring cur_dest_path(dest_dir);
+    file_util::AppendToPath(&cur_dest_path, cur_file);
+
+    if (fd.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) {
+      // Recursively copy a subdirectory. We stripped "." and ".." already.
+      if (!CopyRecursiveDirNoCache(cur_source_path, cur_dest_path)) {
+        FindClose(fh);
+        return false;
+      }
+    } else {
+      // Copy the file.
+      if (!::CopyFile(cur_source_path.c_str(), cur_dest_path.c_str(), false)) {
+        FindClose(fh);
+        return false;
+      }
+
+      // We don't check for errors from this function, often, we are copying
+      // files that are in the repository, and they will have read-only set.
+      // This will prevent us from evicting from the cache, but these don't
+      // matter anyway.
+      EvictFileFromSystemCache(cur_dest_path.c_str());
+    }
+  } while (FindNextFile(fh, &fd));
+
+  FindClose(fh);
+  return true;
+}
+
+}  // namespace file_util
+