source: orxonox.OLD/branches/network/src/lib/network/converter.cc @ 6106

/*
   orxonox - the future of 3D-vertical-scrollers

   Copyright (C) 2004 orx

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2, or (at your option)
   any later version.

### File Specific:
   main-programmer: Benjamin Wuest
   co-programmer: ...
*/


/* this is for debug output. It just says, that all calls to PRINT() belong to the DEBUG_MODULE_NETWORK module
   For more information refere to https://www.orxonox.net/cgi-bin/trac.cgi/wiki/DebugOutput
*/
#define DEBUG_MODULE_NETWORK

/* include your own header */
#include "converter.h"


/* using namespace std is default, this needs to be here */
using namespace std;

/*!
 * Standard constructor
 */
Converter::Converter()
{
  /* set the class id for the base object */
  //this->setClassID(CL_ENTITY_MANAGER, "EntityManager");
}

/*!
 * Standard destructor
 */
Converter::~Converter()
{
}

const int sgnadd = 128; // = 2^7

/*!
 * Converts an int into a byte-array
 * @remarks: The int is stored in big-endian
 * @param x: The int which is to convert
 * @return: A byte-array that accords the given int value
 */
byte* Converter::intToByteArray(int x)
{
  const int mod = 256; // = 2^8
  
  
  byte* result = new byte[INTSIZE];
  int sgn;
  if (x >= 0)
    sgn = 1;
  else
  {
    sgn = -1;
    x = -x;
  }
  
  for (int i = 0; i < INTSIZE; i++)
  {
    result[i] = x % mod;
    x /= mod;
  }
  
  if (sgn == -1)
    result[INTSIZE - 1] += sgnadd;
  
  
  return result;
}

/*!
 * Converts a byte-array into an int
 * @param a: The byte-array which is to convert
 * @return: An int that accords the given byte-array
 */
int Converter::byteArrayToInt(byte* a)
{
  int mult = 1;
  const int step = 256; // = 2 ^ 8
  int result = 0;
  for (int i = 0; i < INTSIZE - 2; i++)
  {
    result += a[i] * mult;
    mult *= step;
  }
  
  if (a[INTSIZE - 1] > sgnadd)
  {
    result += (a[INTSIZE - 1] - sgnadd) * mult;
    result *= -1;
  }
  else
    result += a[INTSIZE - 1] * mult;
  
  return result;
}