helpers.hh

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#ifndef __SYSTEMC_EXT_TLM_CORE_2_GENERIC_PAYLOAD_HELPERS_HH__
#define __SYSTEMC_EXT_TLM_CORE_2_GENERIC_PAYLOAD_HELPERS_HH__
 
namespace tlm
{
 
enum tlm_endianness { TLM_UNKNOWN_ENDIAN, TLM_LITTLE_ENDIAN, TLM_BIG_ENDIAN };
 
inline tlm_endianness
get_host_endianness()
{
    static tlm_endianness host_endianness = TLM_UNKNOWN_ENDIAN;
 
    if (host_endianness == TLM_UNKNOWN_ENDIAN) {
        unsigned int number = 1;
        unsigned char *p_msb_or_lsb = (unsigned char *)&number;
        host_endianness = (p_msb_or_lsb[0] == 0) ?
            TLM_BIG_ENDIAN : TLM_LITTLE_ENDIAN;
    }
    return host_endianness;
}
 
inline bool
host_has_little_endianness()
{
    static tlm_endianness host_endianness = TLM_UNKNOWN_ENDIAN;
    static bool host_little_endian = false;
 
    if (host_endianness == TLM_UNKNOWN_ENDIAN) {
        unsigned int number = 1;
        unsigned char *p_msb_or_lsb = (unsigned char *)&number;
 
        host_little_endian = (p_msb_or_lsb[0] == 0) ? false : true;
    }
 
    return host_little_endian;
}
 
inline bool
has_host_endianness(tlm_endianness endianness)
{
    if (host_has_little_endianness()) {
        return endianness == TLM_LITTLE_ENDIAN;
    } else {
        return endianness == TLM_BIG_ENDIAN;
    }
}
 
} // namespace tlm
 
#endif /* __SYSTEMC_EXT_TLM_CORE_2_GENERIC_PAYLOAD_HELPERS_HH__ */