D:/opendownloadmanager/ODM-1.x/fsSpeedMeter.cpp

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/*
  Free Download Manager Copyright (c) 2003-2007 FreeDownloadManager.ORG
  Open Download Manager Copyright (c) 2008-2010 OpenDownloadManager.ORG
*/        

#include "stdafx.h"
#include "fsSpeedMeter.h"

#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif        

fsSpeedMeter::fsSpeedMeter()
{
        m_dwSpeed = 0;
        m_iCurPrevSpeed = 0;
        m_iMaxPrevSpeed = 0;
        m_cMeasures = 0;
        m_done = 0;
        SetInertness (5);
}

fsSpeedMeter::~fsSpeedMeter()
{

}

void fsSpeedMeter::Done(DWORD dwDone)
{
        UpdateSpeed ();
        m_done += dwDone;
}

DWORD fsSpeedMeter::GetSpeed()
{
        UpdateSpeed ();

        
        if (m_iCurPrevSpeed > 0)
                return m_dwSpeed;       
        else
        {
                m_now.Now ();
                if (m_now - m_past == 0)
                        return 0;
                
                return (UINT) ((double) m_done / (m_now - m_past) * 1000.f);
        }
}

void fsSpeedMeter::Reset()
{
        m_past.Now ();
        m_done = 0;
        m_iCurPrevSpeed = 0;
        m_dwSpeed = 0;
        m_cMeasures = 0;
}

void fsSpeedMeter::UpdateSpeed()
{
        m_now.Now ();

        
        if (m_now - m_past > 1000)
        {
                
                if (m_iCurPrevSpeed > m_iMaxPrevSpeed)
                {
                        
                        BOOL bAllGreater = TRUE;        
                        BOOL bAllLess = TRUE;           

                        for (int i = 0; i < m_iMaxPrevSpeed; i++)
                        {
                                if (m_aPrevSpeed [i] < m_dwSpeed)
                                        bAllGreater = FALSE;

                                if (m_aPrevSpeed [i] > m_dwSpeed)
                                        bAllLess = FALSE;
                        }

                        
                        if (bAllGreater || bAllLess)
                                m_cMeasures = 0;        

                        m_iCurPrevSpeed = 0;
                }
                
                m_aPrevSpeed [m_iCurPrevSpeed++] = (UINT) ((double) m_done / (m_now - m_past) * 1000.f);

                if (m_cMeasures == 0)
                        m_dwSpeed = m_aPrevSpeed [m_iCurPrevSpeed-1]; 

                m_cMeasures++;
                
                m_dwSpeed = DWORD (m_dwSpeed * ((double)(m_cMeasures-1) / m_cMeasures) + 
                                                                                                        (double) m_aPrevSpeed [m_iCurPrevSpeed-1] / m_cMeasures);

                m_past.Now ();
                m_done = 0;
        }
}

void fsSpeedMeter::SetInertness(int val)
{
        if (val < 10)
        {
                m_iMaxPrevSpeed = val;
                m_iCurPrevSpeed = 0;
                m_dwSpeed = 0;
        }
}

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