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      1 /*
      2  * Copyright (C) 2010 Google Inc.  All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #ifndef FileWriterBase_h
     32 #define FileWriterBase_h
     33 
     34 #include "wtf/OwnPtr.h"
     35 #include "wtf/PassOwnPtr.h"
     36 #include "wtf/RefCounted.h"
     37 
     38 namespace WebCore {
     39 
     40 class AsyncFileWriter;
     41 
     42 class FileWriterBase : public RefCounted<FileWriterBase> {
     43 public:
     44     virtual ~FileWriterBase();
     45     void initialize(PassOwnPtr<AsyncFileWriter>, long long length);
     46 
     47     long long position() const
     48     {
     49         return m_position;
     50     }
     51     long long length() const
     52     {
     53         return m_length;
     54     }
     55 
     56 protected:
     57     FileWriterBase();
     58 
     59     AsyncFileWriter* writer()
     60     {
     61         return m_writer.get();
     62     }
     63 
     64     void setPosition(long long position)
     65     {
     66         m_position = position;
     67     }
     68 
     69     void setLength(long long length)
     70     {
     71         m_length = length;
     72     }
     73 
     74     void seekInternal(long long position);
     75 
     76 private:
     77     friend class WTF::RefCounted<FileWriterBase>;
     78 
     79     OwnPtr<AsyncFileWriter> m_writer;
     80     long long m_position;
     81     long long m_length;
     82 };
     83 
     84 } // namespace WebCore
     85 
     86 #endif // FileWriterBase_h
     87