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/file_path.h"
  10 #include "base/logging.h"
  11 #include "base/message_loop.h"
  12 #include "base/win/scoped_handle.h"
  13
  14 namespace {
  15
  16 // Deletes all the files on path that match search_name pattern.
  17 void DeleteFiles(const FilePath& path, const wchar_t* search_name) {
  18   FilePath name(path.Append(search_name));
  19
  20   WIN32_FIND_DATA data;
  21   HANDLE handle = FindFirstFile(name.value().c_str(), &data);
  22   if (handle == INVALID_HANDLE_VALUE)
  23     return;
  24
  25   do {
  26     if (data.dwFileAttributes == FILE_ATTRIBUTE_DIRECTORY ||
  27         data.dwFileAttributes == FILE_ATTRIBUTE_REPARSE_POINT)
  28       continue;
  29     DeleteFile(path.Append(data.cFileName).value().c_str());
  30   } while (FindNextFile(handle, &data));
  31
  32   FindClose(handle);
  33 }
  34
  35 }  // namespace
  36
  37 namespace disk_cache {
  38
  39 bool MoveCache(const FilePath& from_path, const FilePath& to_path) {
  40   // I don't want to use the shell version of move because if something goes
  41   // wrong, that version will attempt to move file by file and fail at the end.
  42   if (!MoveFileEx(from_path.value().c_str(), to_path.value().c_str(), 0)) {
  43     LOG(ERROR) << "Unable to move the cache: " << GetLastError();
  44     return false;
  45   }
  46   return true;
  47 }
  48
  49 void DeleteCache(const FilePath& path, bool remove_folder) {
  50   DeleteFiles(path, L"*");
  51   if (remove_folder)
  52     RemoveDirectory(path.value().c_str());
  53 }
  54
  55 bool DeleteCacheFile(const FilePath& name) {
  56   // We do a simple delete, without ever falling back to SHFileOperation, as the
  57   // version from base does.
  58   if (!DeleteFile(name.value().c_str())) {
  59     // There is an error, but we share delete access so let's see if there is a
  60     // file to open. Note that this code assumes that we have a handle to the
  61     // file at all times (even now), so nobody can have a handle that prevents
  62     // us from opening the file again (unless it was deleted).
  63     DWORD sharing = FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE;
  64     DWORD access = SYNCHRONIZE;
  65     base::win::ScopedHandle file(CreateFile(
  66         name.value().c_str(), access, sharing, NULL, OPEN_EXISTING, 0, NULL));
  67     if (file.IsValid())
  68       return false;
  69
  70     // Most likely there is no file to open... and that's what we wanted.
  71   }
  72   return true;
  73 }
  74
  75 }  // namespace disk_cache