libs/sick/include/sick_msg_builder.H

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// Copyright (C) 2004 Pablo Mejia


#ifndef SICK_MSG_BUILDER_H
#define SICK_MSG_BUILDER_H


#include "endian.H"


#include <cassert>
#include <cstring>


namespace sick
{
        using namespace endian;

        class msg_builder_t
        {
        public:
                msg_builder_t ();
                virtual ~msg_builder_t () {};

                unsigned build (unsigned address,
                                unsigned char *data, unsigned max_size);

        protected:
                unsigned m_offset;

                unsigned m_max_size;
                unsigned char *m_data;

                template <typename T>
                void encode (T const &v)
                {
                        assert ((m_offset + sizeof (v)) <= m_max_size);
                        htole (v, m_data + m_offset);
                        m_offset += sizeof (v);
                }

                void encode (void *data, unsigned size)
                {
                        assert ((m_offset + size) <= m_max_size);
                        memcpy (m_data + m_offset, data, size);
                        m_offset += size;
                }

                virtual unsigned _build (void) = 0;
        };
};


#endif

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