/* Copyright     Digital Equipment Corporation & INRIA     1988 */
/* Last modified on Wed Feb 14 16:20:34 GMT+1:00 1990 by herve                */
/*      modified on 17-OCT-1989 20:23:23.17 by Jim Lawton SDE/Galway          */

/* BntoBnn.h: allowing to use the new interfaces of KerN */


#include <stdlib.h>

		/* old types of Bn */

typedef unsigned int 	BigNumType;	/* A BigNum's type */

struct BigNumHeader  			/* The header of a BigNum */
{
   BigNumType 	type;
   int		length;
};


		/* macros of old types of Bn */

#define BN_TYPE(n)	(((struct BigNumHeader *) n) - 1)->type
#define BN_LENGTH(n)	(((struct BigNumHeader *) n) - 1)->length


		/* macros of functions of Bn to functions Bnn */

#define BnIsZero(n, nd, nl)				BnnIsZero ((n+nd), nl)
#define BnMultiply(p, pd, pl, m, md, ml, n, nd, nl)	BnnMultiply ((p+pd), pl, (m+md), ml, (n+nd), nl)
#define BnDivide(n, nd, nl, d, dd, dl)			BnnDivide ((n+nd), nl, (d+dd), dl)
#define BnCompare(m, md, ml, n, nd, nl)			BnnCompare ((m+md), ml, (n+nd), nl)
#define BnSetToZero(n, nd, nl) 				BnnSetToZero ((n+nd), nl) 
#define BnAssign(m, md, n, nd, nl)			BnnAssign ((m+md), (n+nd), nl)
#define BnSetDigit(n, nd, d) 				BnnSetDigit ((n+nd), d) 
#define BnGetDigit(n, nd)				BnnGetDigit ((n+nd))
#define BnNumDigits(n, nd, nl)				BnnNumDigits ((n+nd), nl)
#define BnNumLeadingZeroBitsInDigit(n, nd)		BnnNumLeadingZeroBitsInDigit (*(n+nd))
#define BnDoesDigitFitInWord(n, nd) 			BnnDoesDigitFitInWord (*(n+nd))
#define BnIsDigitZero(n, nd) 				BnnIsDigitZero (*(n+nd))
#define BnIsDigitNormalized(n, nd) 			BnnIsDigitNormalized (*(n+nd))
#define BnIsDigitOdd(n, nd) 				BnnIsDigitOdd (*(n+nd))
#define BnCompareDigits(m, md, n, nd) 			BnnCompareDigits (*(m+md), *(n+nd))
#define BnComplement(n, nd, nl)				BnnComplement ((n+nd), nl)
#define BnAndDigits(m, md, n, nd) 			BnnAndDigits ((m+md), *(n+nd))
#define BnOrDigits(m, md, n, nd) 			BnnOrDigits ((m+md), *(n+nd))
#define BnXorDigits(m, md, n, nd) 			BnnXorDigits ((m+md), *(n+nd))
#define BnShiftLeft(m, md, ml, n, nd, nbits)		*(n+nd) = BnnShiftLeft ((m+md), ml, nbits)
#define BnShiftRight(m, md, ml, n, nd, nbits)		*(n+nd) = BnnShiftRight ((m+md), ml, nbits)
#define BnAddCarry(n, nd, nl, carryin)			BnnAddCarry ((n+nd), nl, carryin)
#define BnAdd(m, md, ml, n, nd, nl, carryin)		BnnAdd ((m+md), ml, (n+nd), nl, carryin)
#define BnSubtractBorrow(n, nd, nl, carryin)		BnnSubtractBorrow ((n+nd), nl, carryin)
#define BnSubtract(m, md, ml, n, nd, nl, carryin)	BnnSubtract ((m+md), ml, (n+nd), nl, carryin)
#define BnMultiplyDigit(p, pd, pl, m, md, ml, n, nd)	BnnMultiplyDigit ((p+pd), pl, (m+md), ml, *(n+nd))
#define BnDivideDigit(q, qd, r, rd, n, nd, nl, d, dd)	*(r+rd) = BnnDivideDigit ((q+qd), (n+nd), nl, *(d+dd))


		/* old functions of Bn */

/*
 *	Creation and access to type and length fields.
 */

/* Allocates a BigNum structure and returns a pointer to it */
BigNum BnAlloc(size) int size; {
	register BigNum n;
 
	n = (BigNum) ((char *) malloc(sizeof(struct BigNumHeader) +
				      size * sizeof(BigNumDigit))
			+ sizeof(struct BigNumHeader));
	BN_LENGTH(n) = size;
	return(n);
}
 
/* Allocates a BigNum, inserts its Type, and returns a pointer to it */
BigNum BnCreate(type, size) BigNumType type; int size; {
	register BigNum n;
 
	n = BnAlloc(size);
	BN_TYPE(n) = type;
	BnSetToZero(n, 0, size);
	return(n);
}
 
/* Frees a BigNum structure */
int BnFree(n) BigNum n; {
	free(((struct BigNumHeader *) n) - 1);
        return 1; 
}
 
/* Returns the BigNum's Type */
BigNumType BnGetType(n) BigNum n; {
        return(BN_TYPE(n));
}
 
/* Sets the BigNum's Type */
void BnSetType(n, type) BigNum n; BigNumType type; {
        BN_TYPE(n) = type;
}
 
/* Returns the number of digits allocated for the BigNum */
int BnGetSize(n) BigNum n; {
	return(BN_LENGTH(n));
}
 
