src/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                       bool do_media_header_validation);
  32
  33   virtual ~MTPFileStreamReader();
  34
  35   // FileStreamReader overrides.
  36   virtual int Read(net::IOBuffer* buf, int buf_len,
  37                    const net::CompletionCallback& callback) OVERRIDE;
  38   virtual int64 GetLength(
  39       const net::Int64CompletionCallback& callback) OVERRIDE;
  40
  41  private:
  42   void FinishValidateMediaHeader(
  43       net::IOBuffer* header_buf,
  44       net::IOBuffer* buf, int buf_len,
  45       const net::CompletionCallback& callback,
  46       const base::File::Info& file_info,
  47       int header_bytes_read);
  48
  49   void FinishRead(const net::CompletionCallback& callback,
  50                   const base::File::Info& file_info, int bytes_read);
  51
  52   void FinishGetLength(const net::Int64CompletionCallback& callback,
  53                        const base::File::Info& file_info);
  54
  55   scoped_refptr<fileapi::FileSystemContext> file_system_context_;
  56   fileapi::FileSystemURL url_;
  57   int64 current_offset_;
  58   const base::Time expected_modification_time_;
  59
  60   bool media_header_validated_;
  61
  62   base::WeakPtrFactory<MTPFileStreamReader> weak_factory_;
  63
  64   DISALLOW_COPY_AND_ASSIGN(MTPFileStreamReader);
  65 };
  66
  67 #endif  // CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_MTP_FILE_STREAM_READER_H_