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375ecf678c
Update the vendored TomsFastMath (TFM) library to v0.13.1. Resolves: https://bugzilla.clamav.net/show_bug.cgi?id=11992 I removed compatibility macro's from when libTomMath was used. This required removing a bunch of faux-error handling because the fast-math equivalent functions return void, and cannot fail. The previous version used had named the header "bignum_fast.h" instead of "tfm.h" and had customizations in that header to enable TFM_CHECK all the time, and also TFM_NO_ASM if __GNUC__ not defined or if the system isn't 64bit architecture. This update uses tfm.h as-is, and has CMake define TFM_CHECK and TFM_NO_ASM as needed. I've kept bignum.h as an interface to including tfm.h so that in the future we can more easily add support for system-installed TomsFastMath instead of the vendored one, taking inspiration from Debian's patch to support system-TomsFastMath. See: https://salsa.debian.org/clamav-team/clamav/-/blob/unstable/debian/patches/add-support-for-system-tomsfastmath.patch
42 lines
965 B
C
42 lines
965 B
C
/* TomsFastMath, a fast ISO C bignum library.
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*
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* This project is meant to fill in where LibTomMath
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* falls short. That is speed ;-)
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*
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* This project is public domain and free for all purposes.
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*
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* Tom St Denis, tomstdenis@gmail.com
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*/
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#include <tfm_private.h>
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/* c = a mod 2**d */
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void fp_mod_2d(fp_int *a, int b, fp_int *c)
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{
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int x;
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/* zero if count less than or equal to zero */
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if (b <= 0) {
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fp_zero(c);
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return;
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}
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/* get copy of input */
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fp_copy(a, c);
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/* if 2**d is larger than we just return */
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if (b >= (DIGIT_BIT * a->used)) {
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return;
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}
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/* zero digits above the last digit of the modulus */
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for (x = (b / DIGIT_BIT) + ((b % DIGIT_BIT) == 0 ? 0 : 1); x < c->used; x++) {
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c->dp[x] = 0;
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}
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/* clear the digit that is not completely outside/inside the modulus */
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c->dp[b / DIGIT_BIT] &= ~((fp_digit)0) >> (DIGIT_BIT - b);
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fp_clamp (c);
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}
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/* $Source$ */
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/* $Revision$ */
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/* $Date$ */
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