chrome/browser/media_galleries/fileapi/mtp_file_stream_reader.h

   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 CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_MTP_FILE_STREAM_READER_H_
   6 #define CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_MTP_FILE_STREAM_READER_H_
   7
   8 #include "base/bind.h"
   9 #include "base/files/file.h"
  10 #include "base/memory/ref_counted.h"
  11 #include "base/memory/weak_ptr.h"
  12 #include "webkit/browser/blob/file_stream_reader.h"
  13 #include "webkit/browser/fileapi/file_system_url.h"
  14 #include "webkit/browser/webkit_storage_browser_export.h"
  15
  16 namespace base {
  17 class FilePath;
  18 }
  19
  20 namespace fileapi {
  21 class FileSystemContext;
  22 }
  23
  24 class MTPFileStreamReader
  25     : public NON_EXPORTED_BASE(webkit_blob::FileStreamReader) {
  26  public:
  27   MTPFileStreamReader(fileapi::FileSystemContext* file_system_context,
  28                       const fileapi::FileSystemURL& url,
  29                       int64 initial_offset,
  30                       const base::Time& expected_modification_time);
  31
  32   virtual ~MTPFileStreamReader();
  33
  34   // FileStreamReader overrides.
  35   virtual int Read(net::IOBuffer* buf, int buf_len,
  36                    const net::CompletionCallback& callback) OVERRIDE;
  37   virtual int64 GetLength(
  38       const net::Int64CompletionCallback& callback) OVERRIDE;
  39
  40  private:
  41   void OnFileInfoForRead(net::IOBuffer* buf, int buf_len,
  42                          const net::CompletionCallback& callback,
  43                          const base::File::Info& file_info);
  44
  45   void FinishRead(const net::CompletionCallback& callback,
  46                   int bytes_read);
  47
  48   void FinishGetLength(const net::Int64CompletionCallback& callback,
  49                        const base::File::Info& file_info);
  50
  51   scoped_refptr<fileapi::FileSystemContext> file_system_context_;
  52   fileapi::FileSystemURL url_;
  53   int64 current_offset_;
  54   const base::Time expected_modification_time_;
  55   base::WeakPtrFactory<MTPFileStreamReader> weak_factory_;
  56
  57   DISALLOW_COPY_AND_ASSIGN(MTPFileStreamReader);
  58 };
  59
  60 #endif  // CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_MTP_FILE_STREAM_READER_H_