GnashNPVariant.h

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// 
//   Copyright (C) 2010 Free Software Foundation, Inc
// 
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 3 of the License, or
// (at your option) any later version.
// 
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
//

#ifndef GNASH_NPVARIANT_H
#define GNASH_NPVARIANT_H

#include "npapi.h"
#include "npruntime.h"

namespace gnash {

inline void
CopyVariantValue(const NPVariant& from, NPVariant& to)
{
    // First, we'll make a shallow copy, which is fine for most variant types.
    to = from;

    // For deep copies for strings we obviously have to duplicate the string,
    // and object pointer copies need to have their reference count increased.
    switch(from.type) {
        case NPVariantType_String:
        {
            const NPString& fromstr = NPVARIANT_TO_STRING(from);
            const uint32_t& len = fromstr.UTF8Length;

            NPUTF8* tostr = static_cast<NPUTF8*>(NPN_MemAlloc(len));
            std::copy(fromstr.UTF8Characters, fromstr.UTF8Characters+len, tostr);

            STRINGN_TO_NPVARIANT(tostr, len, to);
            break;
        }
        case NPVariantType_Object:
            NPN_RetainObject(NPVARIANT_TO_OBJECT(to));
            break;
        default:
        {}
    }
}

//
inline std::string
NPStringToString(const NPString& str)
{
    return std::string(str.UTF8Characters, str.UTF8Length);
}


//
class GnashNPVariant
{
public:
    GnashNPVariant()
    {
        NULL_TO_NPVARIANT(_variant);
    }

    GnashNPVariant(const GnashNPVariant& var)
    {
        CopyVariantValue(var._variant, _variant);
    }

    GnashNPVariant(const NPVariant& var)
    {
        CopyVariantValue(var, _variant);
    }

    GnashNPVariant& operator= (const GnashNPVariant& var)
    {
        NPN_ReleaseVariantValue(&_variant);

        CopyVariantValue(var._variant, _variant);

        return *this;
    }

    //
    void
    copy(NPVariant& dest) const
    {
        CopyVariantValue(_variant, dest);
    }

    //
    const NPVariant& get() const { return _variant; }

    ~GnashNPVariant()
    {
        NPN_ReleaseVariantValue(&_variant);
    }

private:
    NPVariant _variant;
};

} // namespace gnash

#endif // GNASH_NPVARIANT_H

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