change some parameters in the library to meet the needs of the website httpbin.org
Fork of MiniTLS-GPL by
math/addsub/s_fp_sub.c@5:95f70ebfe61f, 2015-02-06 (annotated)
- Committer:
- shiyilei
- Date:
- Fri Feb 06 06:17:33 2015 +0000
- Revision:
- 5:95f70ebfe61f
- Parent:
- 0:35aa5be3b78d
change some parameters in the library to meet the needs of httpbin.org
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 | /* unsigned subtraction ||a|| >= ||b|| ALWAYS! */ |
MiniTLS | 0:35aa5be3b78d | 13 | void s_fp_sub(fp_int *a, fp_int *b, fp_int *c) |
MiniTLS | 0:35aa5be3b78d | 14 | { |
MiniTLS | 0:35aa5be3b78d | 15 | int x, oldbused, oldused; |
MiniTLS | 0:35aa5be3b78d | 16 | fp_word t; |
MiniTLS | 0:35aa5be3b78d | 17 | |
MiniTLS | 0:35aa5be3b78d | 18 | oldused = c->used; |
MiniTLS | 0:35aa5be3b78d | 19 | oldbused = b->used; |
MiniTLS | 0:35aa5be3b78d | 20 | c->used = a->used; |
MiniTLS | 0:35aa5be3b78d | 21 | t = 0; |
MiniTLS | 0:35aa5be3b78d | 22 | for (x = 0; x < oldbused; x++) { |
MiniTLS | 0:35aa5be3b78d | 23 | t = ((fp_word)a->dp[x]) - (((fp_word)b->dp[x]) + t); |
MiniTLS | 0:35aa5be3b78d | 24 | c->dp[x] = (fp_digit)t; |
MiniTLS | 0:35aa5be3b78d | 25 | t = (t >> DIGIT_BIT)&1; |
MiniTLS | 0:35aa5be3b78d | 26 | } |
MiniTLS | 0:35aa5be3b78d | 27 | for (; x < a->used; x++) { |
MiniTLS | 0:35aa5be3b78d | 28 | t = ((fp_word)a->dp[x]) - t; |
MiniTLS | 0:35aa5be3b78d | 29 | c->dp[x] = (fp_digit)t; |
MiniTLS | 0:35aa5be3b78d | 30 | t = (t >> DIGIT_BIT); |
MiniTLS | 0:35aa5be3b78d | 31 | } |
MiniTLS | 0:35aa5be3b78d | 32 | for (; x < oldused; x++) { |
MiniTLS | 0:35aa5be3b78d | 33 | c->dp[x] = 0; |
MiniTLS | 0:35aa5be3b78d | 34 | } |
MiniTLS | 0:35aa5be3b78d | 35 | fp_clamp(c); |
MiniTLS | 0:35aa5be3b78d | 36 | } |
MiniTLS | 0:35aa5be3b78d | 37 | |
MiniTLS | 0:35aa5be3b78d | 38 | /* $Source: /cvs/libtom/tomsfastmath/src/addsub/s_fp_sub.c,v $ */ |
MiniTLS | 0:35aa5be3b78d | 39 | /* $Revision: 1.1 $ */ |
MiniTLS | 0:35aa5be3b78d | 40 | /* $Date: 2006/12/31 21:25:53 $ */ |