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      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.
     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 
     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 
     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 
     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