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ImfOpaqueAttribute.h

///////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2004, Industrial Light & Magic, a division of Lucas
// Digital Ltd. LLC
// 
// All rights reserved.
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// modification, are permitted provided that the following conditions are
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// *       Redistributions of source code must retain the above copyright
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// *       Redistributions in binary form must reproduce the above
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// distribution.
// *       Neither the name of Industrial Light & Magic nor the names of
// its contributors may be used to endorse or promote products derived
// from this software without specific prior written permission. 
// 
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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#ifndef INCLUDED_IMF_OPAQUE_ATTRIBUTE_H
#define INCLUDED_IMF_OPAQUE_ATTRIBUTE_H

//-----------------------------------------------------------------------------
//
//    class OpaqueAttribute
//
//    When an image file is read, OpqaqueAttribute objects are used
//    to hold the values of attributes whose types are not recognized
//    by the reading program.  OpaqueAttribute objects can be read
//    from an image file, copied, and written back to to another image
//    file, but their values are inaccessible.
//
//-----------------------------------------------------------------------------

#include <ImfAttribute.h>
#include <ImfArray.h>

namespace Imf {


class OpaqueAttribute: public Attribute
{
  public:

    //----------------------------
    // Constructors and destructor
    //----------------------------

    OpaqueAttribute (const char typeName[]);
    OpaqueAttribute (const OpaqueAttribute &other);
    virtual ~OpaqueAttribute ();


    //-------------------------------
    // Get this attribute's type name
    //-------------------------------

    virtual const char *      typeName () const;
    

    //------------------------------
    // Make a copy of this attribute
    //------------------------------

    virtual Attribute *       copy () const;


    //----------------
    // I/O and copying
    //----------------

    virtual void        writeValueTo (OStream &os,
                                    int version) const;

    virtual void        readValueFrom (IStream &is,
                                     int size,
                                     int version);

    virtual void        copyValueFrom (const Attribute &other);


  private:

    Array<char>               _typeName;
    long                _dataSize;
    Array<char>               _data;
};


} // namespace Imf

// Metrowerks compiler wants the .cpp file inlined, too
#ifdef __MWERKS__
#include <ImfOpaqueAttribute.cpp>
#endif

#endif

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