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
14 namespace {
15
16 // Deletes all the files on path that match search_name pattern.
DeleteFiles(const wchar_t * path,const wchar_t * search_name)17 void 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
42 namespace disk_cache {
43
MoveCache(const FilePath & from_path,const FilePath & to_path)44 bool 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
DeleteCache(const FilePath & path,bool remove_folder)54 void 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
DeleteCacheFile(const FilePath & name)60 bool 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