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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 #if ENABLE(FILE_SYSTEM)
     35 
     36 #include "AsyncFileWriterClient.h"
     37 #include <wtf/OwnPtr.h>
     38 #include <wtf/PassOwnPtr.h>
     39 #include <wtf/RefCounted.h>
     40 
     41 namespace WebCore {
     42 
     43 class AsyncFileWriter;
     44 class Blob;
     45 
     46 typedef int ExceptionCode;
     47 
     48 class FileWriterBase : public RefCounted<FileWriterBase> {
     49 public:
     50     virtual ~FileWriterBase();
     51     void initialize(PassOwnPtr<AsyncFileWriter>, long long length);
     52 
     53     long long position() const
     54     {
     55         return m_position;
     56     }
     57     long long length() const
     58     {
     59         return m_length;
     60     }
     61 
     62 protected:
     63     FileWriterBase();
     64 
     65     AsyncFileWriter* writer()
     66     {
     67         return m_writer.get();
     68     }
     69 
     70     void setPosition(long long position)
     71     {
     72         m_position = position;
     73     }
     74 
     75     void setLength(long long length)
     76     {
     77         m_length = length;
     78     }
     79 
     80     void seekInternal(long long position);
     81 
     82 private:
     83     friend class WTF::RefCounted<FileWriterBase>;
     84 
     85     OwnPtr<AsyncFileWriter> m_writer;
     86     long long m_position;
     87     long long m_length;
     88 };
     89 
     90 } // namespace WebCore
     91 
     92 #endif // ENABLE(FILE_SYSTEM)
     93 
     94 #endif // FileWriterBase_h
     95