Mercurial > dropbear
annotate libtommath/bn_mp_radix_size.c @ 1684:d5d25ce2a2ed
cast to fix warning
author | Matt Johnston <matt@ucc.asn.au> |
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date | Tue, 26 May 2020 19:57:28 +0800 |
parents | f52919ffd3b1 |
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1 #include "tommath_private.h" |
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2 #ifdef BN_MP_RADIX_SIZE_C |
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3 /* LibTomMath, multiple-precision integer library -- Tom St Denis |
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4 * |
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5 * LibTomMath is a library that provides multiple-precision |
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6 * integer arithmetic as well as number theoretic functionality. |
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7 * |
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8 * The library was designed directly after the MPI library by |
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9 * Michael Fromberger but has been written from scratch with |
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10 * additional optimizations in place. |
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11 * |
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12 * SPDX-License-Identifier: Unlicense |
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13 */ |
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14 |
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15 /* returns size of ASCII reprensentation */ |
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16 int mp_radix_size(const mp_int *a, int radix, int *size) |
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17 { |
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18 int res, digs; |
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19 mp_int t; |
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20 mp_digit d; |
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21 |
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22 *size = 0; |
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23 |
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24 /* make sure the radix is in range */ |
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25 if ((radix < 2) || (radix > 64)) { |
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26 return MP_VAL; |
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27 } |
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28 |
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29 if (mp_iszero(a) == MP_YES) { |
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30 *size = 2; |
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31 return MP_OKAY; |
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32 } |
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33 |
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34 /* special case for binary */ |
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35 if (radix == 2) { |
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36 *size = mp_count_bits(a) + ((a->sign == MP_NEG) ? 1 : 0) + 1; |
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37 return MP_OKAY; |
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38 } |
1436 | 39 |
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40 /* digs is the digit count */ |
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41 digs = 0; |
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42 |
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43 /* if it's negative add one for the sign */ |
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44 if (a->sign == MP_NEG) { |
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45 ++digs; |
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46 } |
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47 |
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48 /* init a copy of the input */ |
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49 if ((res = mp_init_copy(&t, a)) != MP_OKAY) { |
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50 return res; |
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51 } |
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52 |
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53 /* force temp to positive */ |
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54 t.sign = MP_ZPOS; |
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55 |
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56 /* fetch out all of the digits */ |
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57 while (mp_iszero(&t) == MP_NO) { |
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58 if ((res = mp_div_d(&t, (mp_digit)radix, &t, &d)) != MP_OKAY) { |
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59 mp_clear(&t); |
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60 return res; |
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61 } |
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62 ++digs; |
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63 } |
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64 mp_clear(&t); |
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65 |
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66 /* return digs + 1, the 1 is for the NULL byte that would be required. */ |
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67 *size = digs + 1; |
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68 return MP_OKAY; |
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69 } |
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70 |
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71 #endif |
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72 |
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73 /* ref: HEAD -> master, tag: v1.1.0 */ |
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74 /* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */ |
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75 /* commit time: 2019-01-28 20:32:32 +0100 */ |