Mercurial > dropbear

annotate libtommath/bn_mp_fread.c @ 1857:6022df862942

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Use DSCP for IP QoS traffic classes The previous TOS values are deprecated and not used by modern traffic classifiers. This sets AF21 for "interactive" traffic (with a tty). Non-tty traffic sets AF11 - that indicates high throughput but is not lowest priority (which would be CS1 or LE). This differs from the CS1 used by OpenSSH, it lets interactive git over SSH have higher priority than background least effort traffic. Dropbear's settings here should be suitable with the diffservs used by CAKE qdisc.
author Matt Johnston <matt@ucc.asn.au>
date Tue, 25 Jan 2022 17:32:20 +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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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