Utility::ReverseBytes

Section: C Library Functions (3) Updated: Thu Apr 7 2011 Local index Up

NAME

Utility::ReverseBytes -

SYNOPSIS

#include <utility.h>

Public Member Functions

ReverseBytes (const bool dr)

template<typename T > T operator() (T &data) const

Private Member Functions

bool reverse () const

Private Attributes

const bool _do_reverse

Detailed Description

This Functor simply takes an object and reverses its byte representation. This is useful for changing endian-ness for file IO. This class has been tested on x86 architectures with 4-byte words.

Definition at line 271 of file utility.h.

Constructor & Destructor Documentation

Utility::ReverseBytes::ReverseBytes (const booldr) [inline]Constructor. Takes a bool, determines if we will actually do byte reversing.

Definition at line 306 of file utility.h.

                                           :
    _do_reverse (rb)
  {}

Member Function Documentation

template<typename T > T Utility::ReverseBytes::operator() (T &data) const [inline]Functor. Takes the data to reverse and performs the byte-ordering reversal.

Definition at line 313 of file utility.h.

References reverse().

  {
    // Possibly reverse the byte ordering
    if (this->reverse())
      {
        unsigned char* b = (unsigned char*) &data;
        
        register int i=0;
        register int j=(sizeof(T) - 1);
        
        while (i < j)
          {
            std::swap (b[i], b[j]);
            i++; j--;
          }
      }

    return data;
  }