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annotate libtommath/bn_mp_fread.c @ 1680:5e763ad6e2e0

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author Matt Johnston <matt@ucc.asn.au>
date Sun, 24 May 2020 13:34:19 +0800
parents f52919ffd3b1
children 1051e4eea25a
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1 #include "tommath_private.h"
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2 #ifdef BN_MP_FREAD_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 #ifndef LTM_NO_FILE
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16 /* read a bigint from a file stream in ASCII */
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17 int mp_fread(mp_int *a, int radix, FILE *stream)
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18 {
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19 int err, ch, neg, y;
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20 unsigned pos;
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21
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22 /* clear a */
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23 mp_zero(a);
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24
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25 /* if first digit is - then set negative */
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26 ch = fgetc(stream);
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27 if (ch == (int)'-') {
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28 neg = MP_NEG;
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29 ch = fgetc(stream);
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30 } else {
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31 neg = MP_ZPOS;
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32 }
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33
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34 for (;;) {
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35 pos = (unsigned)(ch - (int)'(');
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36 if (mp_s_rmap_reverse_sz < pos) {
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37 break;
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38 }
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40 y = (int)mp_s_rmap_reverse[pos];
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41
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42 if ((y == 0xff) || (y >= radix)) {
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43 break;
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44 }
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45
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46 /* shift up and add */
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47 if ((err = mp_mul_d(a, (mp_digit)radix, a)) != MP_OKAY) {
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48 return err;
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49 }
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50 if ((err = mp_add_d(a, (mp_digit)y, a)) != MP_OKAY) {
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51 return err;
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52 }
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53
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54 ch = fgetc(stream);
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55 }
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56 if (mp_cmp_d(a, 0uL) != MP_EQ) {
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57 a->sign = neg;
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58 }
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59
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60 return MP_OKAY;
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61 }
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62 #endif
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63
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64 #endif
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65
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66 /* ref: HEAD -> master, tag: v1.1.0 */
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67 /* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */
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68 /* commit time: 2019-01-28 20:32:32 +0100 */