1f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project#include <tommath.h> 2f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project#ifdef BN_MP_FREAD_C 3f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project/* LibTomMath, multiple-precision integer library -- Tom St Denis 4f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * 5f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * LibTomMath is a library that provides multiple-precision 6f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * integer arithmetic as well as number theoretic functionality. 7f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * 8f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * The library was designed directly after the MPI library by 9f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * Michael Fromberger but has been written from scratch with 10f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * additional optimizations in place. 11f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * 12f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * The library is free for all purposes without any express 13f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * guarantee it works. 14f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * 15f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * Tom St Denis, tomstdenis@gmail.com, http://math.libtomcrypt.com 16f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project */ 17f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 18f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project/* read a bigint from a file stream in ASCII */ 19f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Projectint mp_fread(mp_int *a, int radix, FILE *stream) 20f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project{ 21f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project int err, ch, neg, y; 22f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 23f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project /* clear a */ 24f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project mp_zero(a); 25f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 26f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project /* if first digit is - then set negative */ 27f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project ch = fgetc(stream); 28f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project if (ch == '-') { 29f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project neg = MP_NEG; 30f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project ch = fgetc(stream); 31f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project } else { 32f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project neg = MP_ZPOS; 33f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project } 34f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 35f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project for (;;) { 36f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project /* find y in the radix map */ 37f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project for (y = 0; y < radix; y++) { 38f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project if (mp_s_rmap[y] == ch) { 39f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project break; 40f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project } 41f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project } 42f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project if (y == radix) { 43f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project break; 44f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project } 45f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 46f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project /* shift up and add */ 47f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project if ((err = mp_mul_d(a, radix, a)) != MP_OKAY) { 48f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project return err; 49f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project } 50f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project if ((err = mp_add_d(a, y, a)) != MP_OKAY) { 51f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project return err; 52f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project } 53f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 54f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project ch = fgetc(stream); 55f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project } 56f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project if (mp_cmp_d(a, 0) != MP_EQ) { 57f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project a->sign = neg; 58f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project } 59f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 60f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project return MP_OKAY; 61f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project} 62f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 63f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project#endif 64f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 65f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project/* $Source: /cvs/libtom/libtommath/bn_mp_fread.c,v $ */ 66f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project/* $Revision: 1.3 $ */ 67f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project/* $Date: 2006/03/31 14:18:44 $ */ 68