storage/browser/fileapi/transient_file_util.cc

   1 // Copyright (c) 2013 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 "storage/browser/fileapi/transient_file_util.h"
   6
   7 #include <string>
   8
   9 #include "base/bind.h"
  10 #include "base/files/file_path.h"
  11 #include "storage/browser/fileapi/file_system_operation_context.h"
  12 #include "storage/browser/fileapi/file_system_url.h"
  13 #include "storage/browser/fileapi/isolated_context.h"
  14
  15 using storage::ScopedFile;
  16
  17 namespace storage {
  18
  19 namespace {
  20
  21 void RevokeFileSystem(const std::string& filesystem_id,
  22                       const base::FilePath& /*path*/) {
  23   IsolatedContext::GetInstance()->RevokeFileSystem(filesystem_id);
  24 }
  25
  26 }  // namespace
  27
  28 ScopedFile TransientFileUtil::CreateSnapshotFile(
  29     FileSystemOperationContext* context,
  30     const FileSystemURL& url,
  31     base::File::Error* error,
  32     base::File::Info* file_info,
  33     base::FilePath* platform_path) {
  34   DCHECK(file_info);
  35   *error = GetFileInfo(context, url, file_info, platform_path);
  36   if (*error == base::File::FILE_OK && file_info->is_directory)
  37     *error = base::File::FILE_ERROR_NOT_A_FILE;
  38   if (*error != base::File::FILE_OK)
  39     return ScopedFile();
  40
  41   // Sets-up a transient filesystem.
  42   DCHECK(!platform_path->empty());
  43   DCHECK(!url.filesystem_id().empty());
  44
  45   ScopedFile scoped_file(
  46       *platform_path,
  47       ScopedFile::DELETE_ON_SCOPE_OUT,
  48       context->task_runner());
  49   scoped_file.AddScopeOutCallback(
  50       base::Bind(&RevokeFileSystem, url.filesystem_id()), NULL);
  51
  52   return scoped_file.Pass();
  53 }
  54
  55 }  // namespace storage