1// Copyright 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#ifndef CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_SAFE_AUDIO_VIDEO_CHECKER_H_ 6#define CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_SAFE_AUDIO_VIDEO_CHECKER_H_ 7 8#include "base/basictypes.h" 9#include "base/callback_forward.h" 10#include "base/files/file.h" 11#include "base/memory/weak_ptr.h" 12#include "content/public/browser/utility_process_host_client.h" 13#include "storage/browser/fileapi/copy_or_move_file_validator.h" 14 15namespace content { 16class UtilityProcessHost; 17} 18 19// Uses a utility process to validate a media file. If the callback returns 20// File::FILE_OK, then the file appears to be a valid media file. This does 21// not attempt to decode the entire file, which may take a considerable amount 22// of time. This class may be constructed on any thread, but should run on the 23// IO thread. 24class SafeAudioVideoChecker : public content::UtilityProcessHostClient { 25 public: 26 // Takes responsibility for closing |file|. 27 SafeAudioVideoChecker( 28 base::File file, 29 const storage::CopyOrMoveFileValidator::ResultCallback& callback); 30 31 // Must be called on the IO thread. 32 void Start(); 33 34 private: 35 enum State { 36 INITIAL_STATE, 37 PINGED_STATE, 38 STARTED_STATE, 39 FINISHED_STATE 40 }; 41 42 virtual ~SafeAudioVideoChecker(); 43 44 // Starts validation once the utility process has been started. 45 virtual void OnProcessStarted(); 46 47 // Notification of the result from the utility process. 48 void OnCheckingFinished(bool valid); 49 50 // UtilityProcessHostClient implementation. 51 virtual void OnProcessCrashed(int exit_code) OVERRIDE; 52 virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE; 53 54 State state_; 55 56 base::File file_; 57 58 const storage::CopyOrMoveFileValidator::ResultCallback callback_; 59 60 base::WeakPtr<content::UtilityProcessHost> utility_process_host_; 61 62 DISALLOW_COPY_AND_ASSIGN(SafeAudioVideoChecker); 63}; 64 65#endif // CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_SAFE_AUDIO_VIDEO_CHECKER_H_ 66