tlm_helpers.h

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/* ---------------------------------------------------------------------------------------
 @file tlm_helpers.h
 
 @brief
 
  Original Authors:
    Charles Wilson, ESLX
    
--------------------------------------------------------------------------------------- */

#ifndef __TLM_HELPERS_H__
#define __TLM_HELPERS_H__

//#include <sys/param.h>
//#include <cstring>

namespace tlm {

enum tlm_endianness { TLM_UNKNOWN_ENDIAN, TLM_LITTLE_ENDIAN, TLM_BIG_ENDIAN };

inline tlm_endianness get_host_endianness(void)
{
  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(void)
{
  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 /* __TLM_HELPERS_H__ */