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https://github.com/mumble-voip/mumble.git
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34c602c85b
This commit removes all qmake-related build-files from the system. We have now migrated to cmake and are no longer maintaining qmake anyways and therefore there is no reason to keep it. Removing it also clearly states to any potential user/programmer that this project is no longer intended to be compiled with qmake. Given that the .pri files no longer exist, the mumble-version.py script had to be adapted to read the version from the CMakeLists.txt file instead. Furthermore a few of the submodules support cmake natively and therefore we no longer need the src/buid-directory approach in order to build them. The respective build dirs have been removed and the src-dirs have been renamed.
85 lines
2.8 KiB
C++
85 lines
2.8 KiB
C++
/* $OpenBSD: arc4random_uniform.c,v 1.2 2015/09/13 08:31:47 guenther Exp $ */
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/*
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* Copyright (c) 2008, Damien Miller <djm@openbsd.org>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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// This is arc4random_uniform.c from OpenBSD's source tree at
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// $OPENBSD_ROOT/lib/libc/crypt/arc4random_uniform.c.
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//
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// Mumble-specific changes:
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//
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// - Change file extension to .cpp and rename to mumble_arc4random_uniform.cpp.
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// - Add CryptographicRandom.h include.
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// - Remove <sys/types.h> and <stdlib.h> includes, include <stdint.h> for uint32_t.
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// - Added an implementation of arc4random called mumble_arc4random.
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// - Rename arc4random_uniform to mumble_arc4random_uniform.
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// - Change call to arc4random in mumble_arc4random_uniform to call
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// mumble_arc4random instead of arc4random.
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// - Remove DEF_WEAK for arc4random_uniform.
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// - Disable MSVC warning 4146.
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#include <stdint.h>
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#include "crypto/CryptographicRandom.h"
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#if defined(_MSC_VER)
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// Disable "unary minus operator applied to unsigned type, result still unsigned"
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// warning. The unary minus operator used in arc4random_uniform is perfectly valid.
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# pragma warning(disable: 4146)
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#endif
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// Call through to CryptographicRandom::uint32()
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uint32_t
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mumble_arc4random(void)
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{
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return CryptographicRandom::uint32();
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}
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/*
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* Calculate a uniformly distributed random number less than upper_bound
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* avoiding "modulo bias".
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*
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* Uniformity is achieved by generating new random numbers until the one
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* returned is outside the range [0, 2**32 % upper_bound). This
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* guarantees the selected random number will be inside
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* [2**32 % upper_bound, 2**32) which maps back to [0, upper_bound)
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* after reduction modulo upper_bound.
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*/
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uint32_t
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mumble_arc4random_uniform(uint32_t upper_bound)
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{
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uint32_t r, min;
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if (upper_bound < 2)
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return 0;
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/* 2**32 % x == (2**32 - x) % x */
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min = -upper_bound % upper_bound;
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/*
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* This could theoretically loop forever but each retry has
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* p > 0.5 (worst case, usually far better) of selecting a
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* number inside the range we need, so it should rarely need
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* to re-roll.
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*/
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for (;;) {
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r = mumble_arc4random();
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if (r >= min)
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break;
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}
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return r % upper_bound;
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}
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