net/disk_cache/cache_util_win.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "net/disk_cache/cache_util.h"
   6
   7 #include <windows.h>
   8
   9 #include "base/files/file_path.h"
  10 #include "base/logging.h"
  11 #include "base/message_loop/message_loop.h"
  12 #include "base/win/scoped_handle.h"
  13
  14 namespace disk_cache {
  15
  16 bool MoveCache(const base::FilePath& from_path, const base::FilePath& to_path) {
  17   // I don't want to use the shell version of move because if something goes
  18   // wrong, that version will attempt to move file by file and fail at the end.
  19   if (!MoveFileEx(from_path.value().c_str(), to_path.value().c_str(), 0)) {
  20     LOG(ERROR) << "Unable to move the cache: " << GetLastError();
  21     return false;
  22   }
  23   return true;
  24 }
  25
  26 bool DeleteCacheFile(const base::FilePath& name) {
  27   // We do a simple delete, without ever falling back to SHFileOperation, as the
  28   // version from base does.
  29   if (!DeleteFile(name.value().c_str())) {
  30     // There is an error, but we share delete access so let's see if there is a
  31     // file to open. Note that this code assumes that we have a handle to the
  32     // file at all times (even now), so nobody can have a handle that prevents
  33     // us from opening the file again (unless it was deleted).
  34     DWORD sharing = FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE;
  35     DWORD access = SYNCHRONIZE;
  36     base::win::ScopedHandle file(CreateFile(
  37         name.value().c_str(), access, sharing, NULL, OPEN_EXISTING, 0, NULL));
  38     if (file.IsValid())
  39       return false;
  40
  41     // Most likely there is no file to open... and that's what we wanted.
  42   }
  43   return true;
  44 }
  45
  46 }  // namespace disk_cache