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      1 // Copyright 2014 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 #ifndef CONTENT_BROWSER_LOADER_TEMPORARY_FILE_STREAM_H_
      6 #define CONTENT_BROWSER_LOADER_TEMPORARY_FILE_STREAM_H_
      7 
      8 #include "base/callback_forward.h"
      9 #include "base/files/file.h"
     10 #include "base/memory/scoped_ptr.h"
     11 #include "content/common/content_export.h"
     12 
     13 namespace net {
     14 class FileStream;
     15 }
     16 
     17 namespace webkit_blob {
     18 class ShareableFileReference;
     19 }
     20 
     21 namespace content {
     22 
     23 typedef base::Callback<void(base::File::Error,
     24                             scoped_ptr<net::FileStream>,
     25                             webkit_blob::ShareableFileReference*)>
     26     CreateTemporaryFileStreamCallback;
     27 
     28 // Creates a temporary file and asynchronously calls |callback| with a
     29 // net::FileStream and webkit_blob::ShareableFileReference. The file is deleted
     30 // when the webkit_blob::ShareableFileReference is deleted. Note it is the
     31 // consumer's responsibility to ensure the webkit_blob::ShareableFileReference
     32 // stays in scope until net::FileStream has finished closing the file. On error,
     33 // |callback| is called with an error in the first parameter.
     34 //
     35 // This function may only be called on the IO thread.
     36 //
     37 // TODO(davidben): Juggling the net::FileStream and
     38 // webkit_blob::ShareableFileReference lifetimes is a nuisance. The two should
     39 // be tied together so the consumer need not deal with it.
     40 CONTENT_EXPORT void CreateTemporaryFileStream(
     41     const CreateTemporaryFileStreamCallback& callback);
     42 
     43 }  // namespace content
     44 
     45 #endif  // CONTENT_BROWSER_LOADER_TEMPORARY_FILE_STREAM_H_
     46