webkit/fileapi/upload_file_system_file_element_reader.h

   1 // Copyright (c) 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 WEBKIT_FILEAPI_UPLOAD_FILE_SYSTEM_FILE_ELEMENT_READER_H_
   6 #define WEBKIT_FILEAPI_UPLOAD_FILE_SYSTEM_FILE_ELEMENT_READER_H_
   7
   8 #include "base/memory/weak_ptr.h"
   9 #include "base/time.h"
  10 #include "googleurl/src/gurl.h"
  11 #include "net/base/upload_element_reader.h"
  12 #include "webkit/storage/webkit_storage_export.h"
  13
  14 namespace webkit_blob {
  15 class FileStreamReader;
  16 }
  17
  18 namespace fileapi {
  19
  20 class FileSystemContext;
  21
  22 // An UploadElementReader implementation for filesystem file.
  23 class WEBKIT_STORAGE_EXPORT UploadFileSystemFileElementReader
  24     : public net::UploadElementReader {
  25  public:
  26   UploadFileSystemFileElementReader(
  27       FileSystemContext* file_system_context,
  28       const GURL& url,
  29       uint64 range_offset,
  30       uint64 range_length,
  31       const base::Time& expected_modification_time);
  32   virtual ~UploadFileSystemFileElementReader();
  33
  34   // UploadElementReader overrides:
  35   virtual int Init(const net::CompletionCallback& callback) OVERRIDE;
  36   virtual uint64 GetContentLength() const OVERRIDE;
  37   virtual uint64 BytesRemaining() const OVERRIDE;
  38   virtual int Read(net::IOBuffer* buf,
  39                    int buf_length,
  40                    const net::CompletionCallback& callback) OVERRIDE;
  41
  42  private:
  43   void OnGetLength(const net::CompletionCallback& callback, int64 result);
  44   void OnRead(const net::CompletionCallback& callback, int result);
  45
  46   scoped_refptr<FileSystemContext> file_system_context_;
  47   const GURL url_;
  48   const uint64 range_offset_;
  49   const uint64 range_length_;
  50   const base::Time expected_modification_time_;
  51
  52   scoped_ptr<webkit_blob::FileStreamReader> stream_reader_;
  53
  54   uint64 stream_length_;
  55   uint64 position_;
  56
  57   base::WeakPtrFactory<UploadFileSystemFileElementReader> weak_ptr_factory_;
  58
  59   DISALLOW_COPY_AND_ASSIGN(UploadFileSystemFileElementReader);
  60 };
  61
  62 }  // namespace fileapi
  63
  64 #endif  // WEBKIT_FILEAPI_UPLOAD_FILE_SYSTEM_FILE_ELEMENT_READER_H_