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150 lines
3.6 KiB
C++
150 lines
3.6 KiB
C++
/*
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This file is a part of JRTPLIB
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Copyright (c) 1999-2017 Jori Liesenborgs
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Contact: jori.liesenborgs@gmail.com
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This library was developed at the Expertise Centre for Digital Media
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(http://www.edm.uhasselt.be), a research center of the Hasselt University
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(http://www.uhasselt.be). The library is based upon work done for
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my thesis at the School for Knowledge Technology (Belgium/The Netherlands).
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Permission is hereby granted, free of charge, to any person obtaining a
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copy of this software and associated documentation files (the "Software"),
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to deal in the Software without restriction, including without limitation
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the rights to use, copy, modify, merge, publish, distribute, sublicense,
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and/or sell copies of the Software, and to permit persons to whom the
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Software is furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included
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in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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IN THE SOFTWARE.
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*/
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#include "rtprandomurandom.h"
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#include "rtperrors.h"
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#include <Qt>
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#include <cstdio>
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namespace qrtplib
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{
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RTPRandomURandom::RTPRandomURandom()
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{
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device = 0;
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}
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RTPRandomURandom::~RTPRandomURandom()
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{
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if (device) {
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fclose(device);
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}
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}
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int RTPRandomURandom::Init()
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{
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if (device) {
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return ERR_RTP_RTPRANDOMURANDOM_ALREADYOPEN;
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}
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device = fopen("/dev/urandom", "rb");
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if (device == 0) {
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return ERR_RTP_RTPRANDOMURANDOM_CANTOPEN;
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}
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return 0;
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}
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uint8_t RTPRandomURandom::GetRandom8()
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{
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if (!device)
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{
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qWarning("RTPRandomURandom::GetRandom8: no device");
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return 0;
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}
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uint8_t value;
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if (fread(&value, 1, sizeof(uint8_t), device) != sizeof(uint8_t))
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{
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qWarning("RTPRandomURandom::GetRandom8: cannot read unsigned 8 bit value from device");
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return 0;
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}
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return value;
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}
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uint16_t RTPRandomURandom::GetRandom16()
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{
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if (!device)
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{
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qWarning("RTPRandomURandom::GetRandom16: no device");
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return 0;
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}
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uint16_t value;
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if (fread(&value, 1, sizeof(uint16_t), device) != sizeof(uint16_t))
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{
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qWarning("RTPRandomURandom::GetRandom16: cannot read unsigned 16 bit value from device");
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return 0;
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}
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return value;
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}
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uint32_t RTPRandomURandom::GetRandom32()
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{
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if (!device)
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{
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qWarning("RTPRandomURandom::GetRandom32: no device");
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return 0;
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}
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uint32_t value;
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if (fread(&value, 1, sizeof(uint32_t), device) != sizeof(uint32_t))
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{
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qWarning("RTPRandomURandom::GetRandom32: cannot read unsigned 32 bit value from device");
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return 0;
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}
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return value;
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}
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double RTPRandomURandom::GetRandomDouble()
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{
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if (!device)
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{
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qWarning("RTPRandomURandom::GetRandomDouble: no device");
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return 0;
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}
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uint64_t value;
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if (fread(&value, 1, sizeof(uint64_t), device) != sizeof(uint64_t))
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{
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qWarning("RTPRandomURandom::GetRandomDouble: cannot read unsigned 64 bit value from device");
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return 0;
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}
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value &= 0x7fffffffffffffffULL;
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int64_t value2 = (int64_t) value;
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double x = RTPRANDOM_2POWMIN63 * (double) value2;
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return x;
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}
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} // end namespace
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