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annotate libtommath/bn_mp_fread.c @ 1938:77bc00dcc19f default tip main master

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Bump version to 2022.82
author Matt Johnston <matt@ucc.asn.au>
date Fri, 01 Apr 2022 14:43:27 +0800
parents 1051e4eea25a
children
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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 /* SPDX-License-Identifier: Unlicense */
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5
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6 #ifndef MP_NO_FILE
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7 /* read a bigint from a file stream in ASCII */
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8 mp_err mp_fread(mp_int *a, int radix, FILE *stream)
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9 {
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10 mp_err err;
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11 mp_sign neg;
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12
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13 /* if first digit is - then set negative */
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14 int ch = fgetc(stream);
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15 if (ch == (int)'-') {
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16 neg = MP_NEG;
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17 ch = fgetc(stream);
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18 } else {
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19 neg = MP_ZPOS;
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20 }
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21
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22 /* no digits, return error */
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23 if (ch == EOF) {
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24 return MP_ERR;
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25 }
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26
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27 /* clear a */
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28 mp_zero(a);
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29
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30 do {
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31 int y;
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32 unsigned pos = (unsigned)(ch - (int)'(');
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33 if (mp_s_rmap_reverse_sz < pos) {
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34 break;
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35 }
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36
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37 y = (int)mp_s_rmap_reverse[pos];
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38
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39 if ((y == 0xff) || (y >= radix)) {
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40 break;
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41 }
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42
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43 /* shift up and add */
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44 if ((err = mp_mul_d(a, (mp_digit)radix, a)) != MP_OKAY) {
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45 return err;
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46 }
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47 if ((err = mp_add_d(a, (mp_digit)y, a)) != MP_OKAY) {
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48 return err;
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49 }
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50 } while ((ch = fgetc(stream)) != EOF);
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51
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52 if (a->used != 0) {
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53 a->sign = neg;
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54 }
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55
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56 return MP_OKAY;
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57 }
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58 #endif
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60 #endif