/*

 * CRC.c

 *

 *  Created on: 2022Äê3ÔÂ28ÈÕ

 *  Author: Laputa

 */

#include "CRC.h"

UINT32 CRC32_Table[256];

unsigned int GetCrc32(unsigned char *InStr,unsigned int len, unsigned int value)

{

	unsigned int a = value;

	for(;len>0;len--)

    {

    	a = (a >> 8) ^ CRC32_Table[(a &0xFF)^(*InStr)];

    	InStr++;

    }

    return a;

}

void Make_CRC32_Table(void)

{

	uint32_t c;

	uint32_t i = 0;

	uint32_t bit = 0;

	for(i = 0; i < 256; i++)

	{

		c  = (uint32_t)i;

		for(bit = 0; bit < 8; bit++)

		{

			if(c&1)

			{

				c = (c >> 1)^(0xEDB88320);

			}

			else

			{

				c =  c >> 1;

			}

		}

		CRC32_Table[i] = c;

	}

}