#include "common.h"

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <unistd.h>
#include <stdint.h>


int checksumDCW(uint8_t *data)
{
    if(data[3] != (uint8_t)((data[0] + data[1] + data[2]) & 0xFF) || data[7] != (uint8_t)((data[4] + data[5] + data[6]) & 0xFF)) {
      return 0;
    }
    if(data[11] != (uint8_t)((data[8] + data[9] + data[10]) & 0xFF) || data[15] != (uint8_t)((data[12] + data[13] + data[14]) & 0xFF)) {
      return 0;
    }
    return 1;
}


int isnullDCW(uint8_t *data)
{
	int a0 = ( !data[0] && !data[1] && !data[2] );
	int a1 = ( !data[4] && !data[5] && !data[6] );
	int b0 = ( !data[8] && !data[9] && !data[10] );
	int b1 = ( !data[12] && !data[13] && !data[14] );
	return ( (a0||a1) && (b0||b1) );
}

int isbadDCW(uint8_t *data)
{
	if ( data[0]!=0 && data[0]==data[1] && data[0]==data[2] ) return 1;
	if ( data[4]!=0 && data[4]==data[5] && data[4]==data[6] ) return 1;
	if ( data[8]!=0 && data[8]==data[9] && data[8]==data[10] ) return 1;
	if ( data[12]!=0 && data[12]==data[13] && data[12]==data[14] ) return 1;
	return 0;
}

int acceptDCW(uint8_t *data)
{

	if (!checksumDCW(data)) return 0;
	if ( isnullDCW(data) ) return 0;
	if ( isbadDCW(data) ) return 0;
/*
	struct dcw_data *dcw = cfg.bad_dcw;
	while (dcw) {
		if ( dcwcmp16(dcw->dcw, data) ) return 0;
		dcw = dcw->next;
	}
*/
	return 1;
}

int similarcw( uint8_t *cw1, uint8_t *cw2 )
{
	int i;
	int count = 0;
	for(i=0; i<8; i++) if (cw1[i]==cw2[i]) count++;
	if (count>3) return 1;
	return 0;
}

// for nds
int ishalfnulledcw( uint8_t dcw[16] )
{
	char nullcw[8] = "\0\0\0\0\0\0\0\0";
	if ( !memcmp(dcw,nullcw,8) || !memcmp(dcw+8,nullcw,8) ) return 1;
	return 0;
}