A header-only library that applies various tests to sequences of bytes stored in files and reports the results of those tests. The class is useful for evaluating pseudorandom number generators for encryption and statistical sampling applications, compression algorithms, and other applications where the information density of a file is of interest.
// Compile: clang++ -std=c++20 example.cpp -o ent
#include "ent.hpp"
int main() {
Ent::Ent ent("test.png");
// Ent::Ent ent("test.txt");
// Or reading from stdin:
// Ent::Ent ent;
ent.setStreamOfBitsMode(false);
ent.setPrintTableMode(false);
ent.setFoldCaseMode(false);
ent.setTerseMode(false);
ent.setPrintResultMode(true);
ent.calculate();
return 0;
}
Entropy = 7.990144 bits per byte.
Optimum compression would reduce the size
of this 469842 byte file by 0 percent.
Chi square distribution for 469842 samples is 6481.037481, and randomly
would exceed this value less than 0.01 percent of the times.
Arithmetic mean value of data bytes is 127.740998 (127.500000 = random).
Monte Carlo value for Pi is 3.104039 (error 1.195363 percent).
Serial correlation coefficient is -0.016080 (totally uncorrelated = 0.0).
Make sure you have saved the example above as: example.cpp
git clone https://github.com/chbtoys/ent.git
cd ent
# Make sure example.cpp is saved in this ent directory.
# Make sure you have a test.png file in this ent directory.
clang++ -std=c++20 example.cpp -o ent
./ent
MIT No Attribution
ent.hpp - A header-only class, that applies various tests to sequences of bytes stored in files and reports the results of those tests. The class is useful for evaluating pseudorandom number generators for encryption and statistical sampling applications, compression algorithms, and other applications where the information density of a file is of interest. Version 0.1 beta (23:rd of June 2023). Copyright (c) 2023 Håkan Blomqvist
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.