rainmeter-studio/Plugins/PluginPerfMon/PerfCntr.cpp

//====================================
// File: PERFCNTR.CPP
// Author: Matt Pietrek
// From: Microsoft Systems Journal
//       "Under the Hood", APRIL 1996
//====================================

#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#endif

#include <windows.h>
#include <winperf.h>
#include <stdlib.h>
#include <stdio.h>
#include <malloc.h>
#include <tchar.h>
#pragma hdrstop
#include "perfcntr.h"

CPerfCounter::CPerfCounter( PTSTR const pszName, DWORD type,
                            PBYTE const pData, DWORD cbData )
{
    m_pszName = _tcsdup( pszName );
    m_type = type;
    m_cbData = cbData;
    m_pData = new BYTE[m_cbData];
    memcpy( m_pData, pData, m_cbData );
}

CPerfCounter::~CPerfCounter( void )
{
    free( m_pszName );
    delete []m_pData;
}

BOOL
CPerfCounter::GetData( PBYTE pBuffer, DWORD cbBuffer, DWORD *pType )
{
    if ( cbBuffer < m_cbData )  // Make sure the buffer is big enough
        return FALSE;
    
    memcpy( pBuffer, m_pData, m_cbData );   // copy the data

    if ( pType )            // If the user wants the type, give it to them
        *pType = m_type;
    
    return TRUE;
}
    
BOOL
CPerfCounter::Format( PTSTR pszBuffer, DWORD nSize, BOOL fHex )
{
    // Do better formatting!!!  Check length!!!

    PTSTR pszPrefix = TEXT("");
    TCHAR szTemp[512];
    
    // First, ascertain the basic type (number, counter, text, or zero)
    switch ( m_type & 0x00000C00 )
    {
        case PERF_TYPE_ZERO:
        {
            wsprintf( pszBuffer, TEXT("ZERO") ); return TRUE;
        }
        case PERF_TYPE_TEXT:
        {
            wsprintf( pszBuffer, TEXT("text counter") ); return TRUE;
        }
        case PERF_TYPE_COUNTER:
        {
            switch( m_type & 0x00070000 )
            {
                case PERF_COUNTER_RATE:
                    pszPrefix = TEXT("counter rate "); break;
                case PERF_COUNTER_FRACTION:
                    pszPrefix = TEXT("counter fraction "); break;
                case PERF_COUNTER_BASE:
                    pszPrefix = TEXT("counter base "); break;
                case PERF_COUNTER_ELAPSED:
                    pszPrefix = TEXT("counter elapsed "); break;
                case PERF_COUNTER_QUEUELEN:
                    pszPrefix = TEXT("counter queuelen "); break;
                case PERF_COUNTER_HISTOGRAM:
                    pszPrefix = TEXT("counter histogram "); break;
                default:
                    pszPrefix = TEXT("counter value "); break;
            }
        }
    }
    
    PTSTR pszFmt = fHex ? TEXT("%s%Xh") : TEXT("%s%u");
    
    switch ( m_cbData )
    {
        case 1: wsprintf(szTemp, pszFmt, pszPrefix, *(PBYTE)m_pData);
                break;
        case 2: wsprintf(szTemp, pszFmt, pszPrefix, *(PWORD)m_pData);
                break;
        case 4: wsprintf(szTemp, pszFmt, pszPrefix, *(PDWORD)m_pData);
                break;
        case 8: // Danger!  Assumes little-endian (X86) byte ordering
                wsprintf( szTemp, TEXT("%s%X%X"), pszPrefix,
                        *(PDWORD)(m_pData+4), *(PDWORD)m_pData ); break;
				break;

        default: wsprintf( szTemp, TEXT("<unhandled size %u>"), m_cbData );
    }
    
    switch ( m_type & 0x70000000 )
    {
        case PERF_DISPLAY_SECONDS:
            _tcscat( szTemp, TEXT(" secs") ); break;
        case PERF_DISPLAY_PERCENT:
            _tcscat( szTemp, TEXT(" %") ); break;
        case PERF_DISPLAY_PER_SEC:
            _tcscat( szTemp, TEXT(" /sec") ); break;
    }

    lstrcpyn( pszBuffer, szTemp, nSize );
        
    return TRUE;
}