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NoiseSource.cpp
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NoiseSource.cpp
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/*
NoiseSource.cpp, Inject random data into a buffer
Copyright (C) 2016 David Merrell
BufferSummary 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 3 of the License, or
(at your option) any later version.
BufferSummary 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, see <http://www.gnu.org/licenses/>.
*/
#include <cstdlib> // std::rand, std::srand
#include "NoiseSource.hpp"
// always produces the same pseudo-random sequence
NoiseSource::NoiseSource(const unsigned int InputSize)
{
int i;
NoiseArray = new int[InputSize];
ArraySize = InputSize;
SRand(2542);
for(i=0; i < ArraySize; i++)
NoiseArray[i] = i;
for(i=0; i < 20; i++)
RandomizeArray();
}
void NoiseSource::RandomizeArray(void)
{
int i, j, k;
for(i=0; i < ArraySize; i++)
{
j = Rand() % ArraySize;
k = NoiseArray[i];
NoiseArray[i] = NoiseArray[j];
NoiseArray[j] = k;
} // for
}
void NoiseSource::InsertNoise(vector<unsigned int> &DataVector, int InNoiseLevel)
{
int i, NoiseLevel;
NoiseLevel= (InNoiseLevel > ArraySize)?ArraySize:InNoiseLevel;
for(i=0; i < NoiseLevel; i++)
DataVector[NoiseArray[i]] = 1;
}
// hokey old Unix rng
// RAND_MAX assumed to be 32767
UInt NoiseSource::Rand(void)
{
NextState = (UInt) ((long long) NextState * 1103515245LL + 12345LL);
return((UInt)(NextState/65536) % 32768);
}
void NoiseSource::SRand(UInt seed)
{
NextState = seed;
}