SysUtil.hpp

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#ifndef MB_SYS_UTIL_HPP
#define MB_SYS_UTIL_HPP

#include <string.h> // for size_t
#include <stdio.h>
#include <iosfwd>

namespace moab {

namespace SysUtil
{

void setmem( void* mem, const void* value, unsigned value_size, size_t num_elem );

long filesize( FILE* filp );

long filesize( std::ifstream& str );

inline bool little_endian()
{
  const unsigned one = 1;
  return !*((char*)&one);
}

inline bool big_endian()
{
  const unsigned one = 1;
  return !(((char*)&one)[sizeof(unsigned)-1]);
}

void byteswap( void* data, unsigned value_size, size_t num_elem );

void byteswap2( void* data, size_t num_elem );
void byteswap4( void* data, size_t num_elem );
void byteswap8( void* data, size_t num_elem );

template <typename T> 
inline void byteswap( T* data, size_t num_elem )
{
  switch (sizeof(T)) {
    case 1:
      break;
    case 2:  
      byteswap2( data, num_elem ); 
      break;
    case 4:  
      byteswap4( data, num_elem ); 
      break;
    case 8: 
      byteswap8( data, num_elem ); 
      break;
    default: 
      byteswap( data, sizeof(T), num_elem ); 
      break;
  }
}


} // namespace SysUtil

} // namespace moab


#endif