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      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_ITUNES_PREF_PARSER_WIN_H_
      6 #define CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_SAFE_ITUNES_PREF_PARSER_WIN_H_
      7 
      8 #include <string>
      9 
     10 #include "base/callback.h"
     11 #include "base/compiler_specific.h"
     12 #include "content/public/browser/utility_process_host_client.h"
     13 
     14 namespace base {
     15 class FilePath;
     16 }
     17 
     18 namespace IPC {
     19 class Message;
     20 }
     21 
     22 namespace itunes {
     23 
     24 // SafeITunesPrefParserWin parses the given iTunes preferences XML data safely
     25 // via a utility process. The SafeITunesPrefParserWin object is ref-counted and
     26 // kept alive after Start() is called until the ParserCallback is called.
     27 // The ParserCallback is guaranteed to be called eventually either when the
     28 // utility process replies or when it dies.
     29 class SafeITunesPrefParserWin : public content::UtilityProcessHostClient {
     30  public:
     31   typedef base::Callback<void(const base::FilePath&)> ParserCallback;
     32 
     33   SafeITunesPrefParserWin(const std::string& unsafe_xml,
     34                           const ParserCallback& callback);
     35 
     36   void Start();
     37 
     38  private:
     39   enum ParserState {
     40     INITIAL_STATE,
     41     STARTED_PARSING_STATE,
     42     FINISHED_PARSING_STATE,
     43   };
     44 
     45   // Private because content::UtilityProcessHostClient is ref-counted.
     46   virtual ~SafeITunesPrefParserWin();
     47 
     48   void StartWorkOnIOThread();
     49 
     50   // Handles the results from OnProcessCrashed() and OnMessageReceived() on
     51   // the IO thread.
     52   void OnGotITunesDirectory(const base::FilePath& library_file);
     53 
     54   // UtilityProcessHostClient implementation.
     55   virtual void OnProcessCrashed(int exit_code) OVERRIDE;
     56   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
     57 
     58   const std::string unsafe_xml_;
     59   const ParserCallback callback_;
     60 
     61   // Verifies the messages from the utility process came at the right time.
     62   // Initialized on the FILE thread, but only accessed on the IO thread.
     63   ParserState parser_state_;
     64 
     65   DISALLOW_COPY_AND_ASSIGN(SafeITunesPrefParserWin);
     66 };
     67 
     68 }  // namespace itunes
     69 
     70 #endif  // CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_SAFE_ITUNES_PREF_PARSER_WIN_H_
     71