1// Copyright (c) 2011 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_util.h"
10#include "base/logging.h"
11#include "base/message_loop.h"
12#include "base/win/scoped_handle.h"
13
14namespace {
15
16// Deletes all the files on path that match search_name pattern.
17void DeleteFiles(const wchar_t* path, const wchar_t* search_name) {
18  std::wstring name(path);
19  file_util::AppendToPath(&name, search_name);
20
21  WIN32_FIND_DATA data;
22  HANDLE handle = FindFirstFile(name.c_str(), &data);
23  if (handle == INVALID_HANDLE_VALUE)
24    return;
25
26  std::wstring adjusted_path(path);
27  adjusted_path += L'\\';
28  do {
29    if (data.dwFileAttributes == FILE_ATTRIBUTE_DIRECTORY ||
30        data.dwFileAttributes == FILE_ATTRIBUTE_REPARSE_POINT)
31      continue;
32    std::wstring current(adjusted_path);
33    current += data.cFileName;
34    DeleteFile(current.c_str());
35  } while (FindNextFile(handle, &data));
36
37  FindClose(handle);
38}
39
40}  // namespace
41
42namespace disk_cache {
43
44bool MoveCache(const FilePath& from_path, const FilePath& to_path) {
45  // I don't want to use the shell version of move because if something goes
46  // wrong, that version will attempt to move file by file and fail at the end.
47  if (!MoveFileEx(from_path.value().c_str(), to_path.value().c_str(), 0)) {
48    LOG(ERROR) << "Unable to move the cache: " << GetLastError();
49    return false;
50  }
51  return true;
52}
53
54void DeleteCache(const FilePath& path, bool remove_folder) {
55  DeleteFiles(path.value().c_str(), L"*");
56  if (remove_folder)
57    RemoveDirectory(path.value().c_str());
58}
59
60bool DeleteCacheFile(const FilePath& name) {
61  // We do a simple delete, without ever falling back to SHFileOperation, as the
62  // version from base does.
63  if (!DeleteFile(name.value().c_str())) {
64    // There is an error, but we share delete access so let's see if there is a
65    // file to open. Note that this code assumes that we have a handle to the
66    // file at all times (even now), so nobody can have a handle that prevents
67    // us from opening the file again (unless it was deleted).
68    DWORD sharing = FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE;
69    DWORD access = SYNCHRONIZE;
70    base::win::ScopedHandle file(CreateFile(
71        name.value().c_str(), access, sharing, NULL, OPEN_EXISTING, 0, NULL));
72    if (file.IsValid())
73      return false;
74
75    // Most likely there is no file to open... and that's what we wanted.
76  }
77  return true;
78}
79
80}  // namespace disk_cache
81