// Crc32.cpp: implementation of the Crc32 class.
//
//////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include "Crc32.h"

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

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////

// Crc32::Crc32()
// {
// 
// }
// 
// Crc32::~Crc32()
// {
// 
// }

unsigned long Crc32::table[ 256 ];
int Crc32::initialized = 0;

Crc32::Crc32( unsigned long init_value )
{
    if ( !initialized ) {
        int i;
        int j;
        unsigned long coeff;
		
        for ( i = 0; i < 256 ; i++ ) {
            coeff = i;
            for ( j = 0; j < 8; j++ ) {
                if ( coeff & 1 )
                    coeff = ( coeff >> 1 ) ^ 0xEDB88320L;
                else
                    coeff >>= 1;
            }
            table[ i ] = coeff;
        }
        initialized = 1;
    }
    crc = init_value;
}