1 b3f61791 2004-03-21 devnull #include "os.h"
 2 b3f61791 2004-03-21 devnull #include <mp.h>
 3 b3f61791 2004-03-21 devnull #include "dat.h"
 4 b3f61791 2004-03-21 devnull 
 5 b3f61791 2004-03-21 devnull #define VLDIGITS (sizeof(vlong)/sizeof(mpdigit))
 6 b3f61791 2004-03-21 devnull 
 7 b3f61791 2004-03-21 devnull /*
 8 b3f61791 2004-03-21 devnull  *  this code assumes that a vlong is an integral number of
 9 b3f61791 2004-03-21 devnull  *  mpdigits long.
10 b3f61791 2004-03-21 devnull  */
11 b3f61791 2004-03-21 devnull mpint*
12 b3f61791 2004-03-21 devnull uvtomp(uvlong v, mpint *b)
13 b3f61791 2004-03-21 devnull {
14 b3f61791 2004-03-21 devnull 	int s;
15 b3f61791 2004-03-21 devnull 
16 b3f61791 2004-03-21 devnull 	if(b == nil)
17 b3f61791 2004-03-21 devnull 		b = mpnew(VLDIGITS*sizeof(mpdigit));
18 b3f61791 2004-03-21 devnull 	else
19 b3f61791 2004-03-21 devnull 		mpbits(b, VLDIGITS*sizeof(mpdigit));
20 b3f61791 2004-03-21 devnull 	mpassign(mpzero, b);
21 b3f61791 2004-03-21 devnull 	if(v == 0)
22 b3f61791 2004-03-21 devnull 		return b;
23 b3f61791 2004-03-21 devnull 	for(s = 0; s < VLDIGITS && v != 0; s++){
24 b3f61791 2004-03-21 devnull 		b->p[s] = v;
25 bcb7f64e 2006-04-20 devnull 	/* !@*$&!@$ gcc gives warnings about the >> here
26 fa325e9b 2020-01-10 cross 	 * when running on 64-bit machines, even though
27 bcb7f64e 2006-04-20 devnull 	 * it's in dead code.  fake it out with two shifts.
28 9e36143a 2005-12-30 devnull 		if(sizeof(mpdigit) == sizeof(uvlong))
29 9e36143a 2005-12-30 devnull 			v = 0;
30 9e36143a 2005-12-30 devnull 		else
31 9e36143a 2005-12-30 devnull 			v >>= sizeof(mpdigit)*8;
32 bcb7f64e 2006-04-20 devnull 	*/
33 bcb7f64e 2006-04-20 devnull 		v >>= sizeof(mpdigit)*4;
34 bcb7f64e 2006-04-20 devnull 		v >>= sizeof(mpdigit)*4;
35 b3f61791 2004-03-21 devnull 	}
36 b3f61791 2004-03-21 devnull 	b->top = s;
37 b3f61791 2004-03-21 devnull 	return b;
38 b3f61791 2004-03-21 devnull }
39 b3f61791 2004-03-21 devnull 
40 b3f61791 2004-03-21 devnull uvlong
41 b3f61791 2004-03-21 devnull mptouv(mpint *b)
42 b3f61791 2004-03-21 devnull {
43 b3f61791 2004-03-21 devnull 	uvlong v;
44 b3f61791 2004-03-21 devnull 	int s;
45 b3f61791 2004-03-21 devnull 
46 b3f61791 2004-03-21 devnull 	if(b->top == 0)
47 b3f61791 2004-03-21 devnull 		return 0LL;
48 b3f61791 2004-03-21 devnull 
49 b3f61791 2004-03-21 devnull 	mpnorm(b);
50 b3f61791 2004-03-21 devnull 	if(b->top > VLDIGITS)
51 b3f61791 2004-03-21 devnull 		return MAXVLONG;
52 b3f61791 2004-03-21 devnull 
53 b3f61791 2004-03-21 devnull 	v = 0ULL;
54 b3f61791 2004-03-21 devnull 	for(s = 0; s < b->top; s++)
55 2b2bd9c4 2006-03-05 devnull 		v |= (uvlong)b->p[s]<<(s*sizeof(mpdigit)*8);
56 b3f61791 2004-03-21 devnull 
57 b3f61791 2004-03-21 devnull 	return v;
58 b3f61791 2004-03-21 devnull }