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      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_
     68