2 #ifdef BN_MP_RADIX_SIZE_C
3 /* LibTomMath, multiple-precision integer library -- Tom St Denis
5 * LibTomMath is a library that provides multiple-precision
6 * integer arithmetic as well as number theoretic functionality.
8 * The library was designed directly after the MPI library by
9 * Michael Fromberger but has been written from scratch with
10 * additional optimizations in place.
12 * The library is free for all purposes without any express
15 * Tom St Denis, tomstdenis@gmail.com, http://math.libtomcrypt.com
18 /* returns size of ASCII reprensentation */
19 int mp_radix_size (mp_int * a, int radix, int *size)
27 /* special case for binary */
29 *size = mp_count_bits (a) + (a->sign == MP_NEG ? 1 : 0) + 1;
33 /* make sure the radix is in range */
34 if (radix < 2 || radix > 64) {
38 if (mp_iszero(a) == MP_YES) {
43 /* digs is the digit count */
46 /* if it's negative add one for the sign */
47 if (a->sign == MP_NEG) {
51 /* init a copy of the input */
52 if ((res = mp_init_copy (&t, a)) != MP_OKAY) {
56 /* force temp to positive */
59 /* fetch out all of the digits */
60 while (mp_iszero (&t) == MP_NO) {
61 if ((res = mp_div_d (&t, (mp_digit) radix, &t, &d)) != MP_OKAY) {
69 /* return digs + 1, the 1 is for the NULL byte that would be required. */
76 /* $Source: /cvs/libtom/libtommath/bn_mp_radix_size.c,v $ */
77 /* $Revision: 1.4 $ */
78 /* $Date: 2006/03/31 14:18:44 $ */