Donatien Garnier
A super trimmed down TLS stack, GPL licensed
Dependents: MiniTLS-HTTPS-Example
MiniTLS - A super trimmed down TLS/SSL Library for embedded devices Author: Donatien Garnier Copyright (C) 2013-2014 AppNearMe Ltd
This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
math/bit/fp_count_bits.c@4:cbaf466d717d, 2014-06-10 (annotated)
- Committer:
- MiniTLS
- Date:
- Tue Jun 10 14:23:09 2014 +0000
- Revision:
- 4:cbaf466d717d
- Parent:
- 0:35aa5be3b78d
Fixes for mbed
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| MiniTLS | 0:35aa5be3b78d | 1 | /* TomsFastMath, a fast ISO C bignum library. |
| MiniTLS | 0:35aa5be3b78d | 2 | * |
| MiniTLS | 0:35aa5be3b78d | 3 | * This project is meant to fill in where LibTomMath |
| MiniTLS | 0:35aa5be3b78d | 4 | * falls short. That is speed ;-) |
| MiniTLS | 0:35aa5be3b78d | 5 | * |
| MiniTLS | 0:35aa5be3b78d | 6 | * This project is public domain and free for all purposes. |
| MiniTLS | 0:35aa5be3b78d | 7 | * |
| MiniTLS | 0:35aa5be3b78d | 8 | * Tom St Denis, tomstdenis@gmail.com |
| MiniTLS | 0:35aa5be3b78d | 9 | */ |
| MiniTLS | 0:35aa5be3b78d | 10 | #include <tfm.h> |
| MiniTLS | 0:35aa5be3b78d | 11 | |
| MiniTLS | 0:35aa5be3b78d | 12 | int fp_count_bits (fp_int * a) |
| MiniTLS | 0:35aa5be3b78d | 13 | { |
| MiniTLS | 0:35aa5be3b78d | 14 | int r; |
| MiniTLS | 0:35aa5be3b78d | 15 | fp_digit q; |
| MiniTLS | 0:35aa5be3b78d | 16 | |
| MiniTLS | 0:35aa5be3b78d | 17 | /* shortcut */ |
| MiniTLS | 0:35aa5be3b78d | 18 | if (a->used == 0) { |
| MiniTLS | 0:35aa5be3b78d | 19 | return 0; |
| MiniTLS | 0:35aa5be3b78d | 20 | } |
| MiniTLS | 0:35aa5be3b78d | 21 | |
| MiniTLS | 0:35aa5be3b78d | 22 | /* get number of digits and add that */ |
| MiniTLS | 0:35aa5be3b78d | 23 | r = (a->used - 1) * DIGIT_BIT; |
| MiniTLS | 0:35aa5be3b78d | 24 | |
| MiniTLS | 0:35aa5be3b78d | 25 | /* take the last digit and count the bits in it */ |
| MiniTLS | 0:35aa5be3b78d | 26 | q = a->dp[a->used - 1]; |
| MiniTLS | 0:35aa5be3b78d | 27 | while (q > ((fp_digit) 0)) { |
| MiniTLS | 0:35aa5be3b78d | 28 | ++r; |
| MiniTLS | 0:35aa5be3b78d | 29 | q >>= ((fp_digit) 1); |
| MiniTLS | 0:35aa5be3b78d | 30 | } |
| MiniTLS | 0:35aa5be3b78d | 31 | return r; |
| MiniTLS | 0:35aa5be3b78d | 32 | } |
| MiniTLS | 0:35aa5be3b78d | 33 | |
| MiniTLS | 0:35aa5be3b78d | 34 | /* $Source: /cvs/libtom/tomsfastmath/src/bit/fp_count_bits.c,v $ */ |
| MiniTLS | 0:35aa5be3b78d | 35 | /* $Revision: 1.1 $ */ |
| MiniTLS | 0:35aa5be3b78d | 36 | /* $Date: 2006/12/31 21:25:53 $ */ |
