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      1 /*
      2  * Copyright (C) 2010 Apple 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
      6  * are met:
      7  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
     14  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
     15  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
     17  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     18  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     19  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     20  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     21  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     22  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
     23  * THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #ifndef DataReference_h
     27 #define DataReference_h
     28 
     29 #include <inttypes.h>
     30 
     31 namespace CoreIPC {
     32 
     33 class ArgumentDecoder;
     34 class ArgumentEncoder;
     35 
     36 class DataReference {
     37 public:
     38     DataReference()
     39         : m_data(0)
     40         , m_size(0)
     41     {
     42     }
     43 
     44     DataReference(const uint8_t* data, size_t size)
     45         : m_data(data)
     46         , m_size(size)
     47     {
     48     }
     49 
     50     bool isEmpty() const { return size() == 0; }
     51 
     52     size_t size() const { return m_size; }
     53     const uint8_t* data() const
     54     {
     55         if (isEmpty())
     56             return 0;
     57         return m_data;
     58     }
     59 
     60     void encode(ArgumentEncoder* encoder) const;
     61     static bool decode(ArgumentDecoder* decoder, DataReference& dataReference);
     62 
     63 private:
     64     const uint8_t* m_data;
     65     size_t m_size;
     66 };
     67 
     68 } // namespace CoreIPC
     69 
     70 #endif // DataReference_h
     71