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support.cpp

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#include "support.h"

 
int support::roundVal_( const double val )
{ 
  int intPart =  static_cast<int>(val); 
  double fracPart = val - intPart; 
  int threeDigits = fracPart * 1000.0; 
  int fourDigits = fracPart * 10000.0; 
  int forthDigit = fourDigits % 10; 
  int thirdDigit = threeDigits % 10;

  double roundVal = 0.001;
  if (forthDigit < 5) {
    roundVal = 0.0;
  }
  else if (forthDigit == 5) {
    if ((thirdDigit & 0x1) == 0) {
      roundVal = 0.0;
    }
  }
  double newVal = val + roundVal;
  double intRslt = newVal * 1000.0;
  return intRslt;
} // roundVal_


void support::roundToInt( int *intVec, 
                          const double *realVec, 
                          const size_t len )
{
  if (intVec != 0 && realVec != 0) {
    for (size_t i = 0; i < len; i++) {
      intVec[i] = roundVal_( realVec[i] );
    }
  }
} // roundToInt


void support::decimalToInt( int *intVec, 
                            const double *realVec, 
                            const size_t len )
{
  if (intVec != 0 && realVec != 0) {
    for (size_t i = 0; i < len; i++) {
      intVec[i] = (int)(realVec[i] * 100.0);
    }
  }
} // roundToInt




size_t support::nearestPower2Width_( size_t val )
{
  size_t width = 0;
  if (val > 0) {
    width = 1;
    size_t power = 1;
    while (power < val && width < 32) {
      power = power << 1;
      width++;
    }
  }
    
  return width;
} // nearestPower2Width_


size_t support::valWidth( const int val )
{
  size_t wholeNum = (val < 0) ? -val : val;
  size_t width = 1 + nearestPower2Width_( wholeNum );

  return width;
} // valWidth


size_t support::UnsignedValWidth( const size_t val )
{
  size_t width = nearestPower2Width_( val );

  return width;
} // valWidth


size_t support::vecWidth( const int *vec, const size_t N )
{
  size_t totalWidth = 0;
  if (vec != 0) {
    for (size_t i = 0; i < N; i++) {
      totalWidth += valWidth( vec[i] );
    }
  }
  return totalWidth;
} // vecWidth( int *)

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