chrome/browser/media_galleries/fileapi/safe_itunes_pref_parser_win.h

   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   ~SafeITunesPrefParserWin() override;
  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   void OnProcessCrashed(int exit_code) override;
  56   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_