/* File : misc.c */

/*
    Copyright (C) 1992 Indian Institute of Technology, Bombay
    Written by V. Srinivas and Vishwas Joglekar,
    Dept of Computer Science and Engineering.

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 1, or (at your option)
    any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/


#include "yapcbr.h"
#include "ipxwatch.h"
#define uchar(x)  (unsigned char) (x)
WORD getword(BYTE *cp);
BYTE *putword(WORD x, BYTE *s);
int hash_addr(BYTE *dest_addr,int len);
int  hex_toascii(unsigned char *str);

/* Get a short in host order from a char array in network order */
WORD getword(cp)
register BYTE  *cp;
{
	register WORD  x;

	x = uchar(*cp++);
	x <<= 8;
	x |= uchar(*cp);
	return x;
}





/* Put a short in host order into a char array in network order */
BYTE *
putword(x,s)
WORD x;
register BYTE *s;
{
	  BYTE *tmp;
	  tmp = s;
	*s++=x>>8;
	*s=x;
	return(tmp);
}

/* hash function, function hashpjw ? */

int hash_addr(BYTE *dest_addr,int len)
 {
 int c;
unsigned  h=0,g;

 for(c=0;c<len;c++){
     h = (h << 4) + dest_addr[c];
     if (g  = h & 0xf0000000) {
	h = h ^ ( g >> 24);
	h = h ^ g;
     }
 }
 return h % MAX_PRIME;
 }


/* Convert hex-ascii to integer */
int  hex_toascii(unsigned char *str)
{
	int i = 0;
	unsigned char ch;
	while((ch = toupper(*str++)) != '\0'){
		if(ch == 'X')
			continue;
		if(ch >= '0' && ch <= '9')
			i = (i * 16) + (ch - '0');
		else if(ch >= 'A' && ch <= 'F')
			i = (i * 16) + (ch - 'A' + 10);
		else break;
	}
	return i;
}