Mercurial > dropbear

annotate libtommath/bn_mp_fread.c @ 1474:d398809812e6

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add $srcdir as needed
author Matt Johnston <matt@ucc.asn.au>
date Fri, 09 Feb 2018 23:34:03 +0800
parents 8bba51a55704
children f52919ffd3b1
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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 * The library is free for all purposes without any express
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13 * guarantee it works.
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14 *
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15 * Tom St Denis, [email protected], http://libtom.org
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16 */
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17
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18 #ifndef LTM_NO_FILE
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19 /* read a bigint from a file stream in ASCII */
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20 int mp_fread(mp_int *a, int radix, FILE *stream)
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21 {
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22 int err, ch, neg, y;
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23
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24 /* clear a */
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25 mp_zero(a);
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26
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27 /* if first digit is - then set negative */
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28 ch = fgetc(stream);
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29 if (ch == '-') {
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30 neg = MP_NEG;
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31 ch = fgetc(stream);
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32 } else {
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33 neg = MP_ZPOS;
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34 }
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35
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36 for (;;) {
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37 /* find y in the radix map */
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38 for (y = 0; y < radix; y++) {
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39 if (mp_s_rmap[y] == ch) {
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40 break;
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41 }
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42 }
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43 if (y == radix) {
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44 break;
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45 }
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46
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47 /* shift up and add */
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48 if ((err = mp_mul_d(a, radix, a)) != MP_OKAY) {
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49 return err;
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50 }
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51 if ((err = mp_add_d(a, y, a)) != MP_OKAY) {
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52 return err;
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53 }
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54
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55 ch = fgetc(stream);
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56 }
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57 if (mp_cmp_d(a, 0) != MP_EQ) {
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58 a->sign = neg;
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59 }
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60
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61 return MP_OKAY;
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62 }
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63 #endif
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64
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65 #endif
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66
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67 /* ref: $Format:%D$ */
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68 /* git commit: $Format:%H$ */
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69 /* commit time: $Format:%ai$ */