/Users/dlarimer/dev/libs/rpc/include/boost/rpc/datastream.hpp

#ifndef _BOOST_RPC_DATASTREAM_HPP_
#define _BOOST_RPC_DATASTREAM_HPP_
#include <boost/type_traits/is_fundamental.hpp>
#include <boost/static_assert.hpp>
#include <stdint.h>
namespace boost { namespace rpc {

struct pack_size{};

template<typename T>
struct datastream
{
        datastream( T start, uint32_t s )
        :m_start(start),m_pos(start),m_end(start+s){};

        template<typename DATA>
        inline datastream& operator<<(const DATA& d)
        {
            BOOST_STATIC_ASSERT( boost::is_fundamental<DATA>::value );
            write( (const char*)&d, sizeof(d) );
            return *this;
        }
        template<typename DATA>
        inline datastream& operator>>(DATA& d)
        {
            BOOST_STATIC_ASSERT( boost::is_fundamental<DATA>::value );
            read((char*)&d, sizeof(d) );
            return *this;
        }

        inline void skip( uint32_t s ){ m_pos += s; }
        inline bool read( char* d, uint32_t s ) {
            if( m_end - m_pos >= (int32_t)s ) {
                memcpy( d, m_pos, s );
                m_pos += s;
                return true;
            }
            return false;
        }
        inline bool write( const char* d, uint32_t s ) {
            if( m_end - m_pos >= (int32_t)s ) {
                memcpy( m_pos, d, s );
                m_pos += s;
                return true;
            }
            return false;
        }
        inline bool     putc(char c)      { 
            if( m_pos < m_end ) {
                *m_pos = c; 
                ++m_pos; 
                return true;
            }
            return  false;
        }
        inline bool     getc( unsigned char& c ) { return getc( *(char*)&c ); }
        inline bool     getc( char& c ) {
            if( m_pos < m_end ) {
                c = *m_pos;
                ++m_pos; 
                return true;
            }
            ++m_pos; 
            return  false;
        }
        T               pos()const        { return m_pos; }
        inline bool     valid()const      { return m_pos <= m_end && m_pos >= m_start;  }
        inline bool     seekp(uint32_t p) { m_pos = m_start + p; return m_pos <= m_end; }
        inline uint32_t tellp()const      { return m_pos - m_start;                     }
        inline uint32_t remaining()const  { return m_end - m_pos;                       }
    private:
        T m_start;
        T m_pos;
        T m_end;
};

template<>
struct datastream<size_t>
{
        datastream( size_t init_size = 0):m_size(init_size){};
        template<typename DATA>
        inline datastream& operator<<(const DATA& d) {
            BOOST_STATIC_ASSERT( boost::is_fundamental<DATA>::value );
            m_size += sizeof(d);
            return *this;
        }
        inline bool skip( uint32_t s ) {
            m_size += s;
            return true;
        }
        inline bool write( const char* d, uint32_t s ) {
            m_size += s;
            return true;
        }
        inline bool     putc(char c)      { 
            ++m_size;
            return  true;
        }
        inline bool     valid()const      { return true;   }
        inline bool     seekp(uint32_t p) { m_size = p;    }
        inline uint32_t tellp()const      { return m_size; }
        inline uint32_t remaining()const  { return 0;      }
    private:
        uint32_t m_size;
};




} } // namespace boost::rpc

#endif

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