JavaFastPFORDemo/src/main/java/org/example/Main.java at main · fast-pack/JavaFastPFORDemo · GitHub

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package org.example;

import me.lemire.integercompression.FastPFOR128;

import me.lemire.integercompression.IntWrapper;

import java.util.Arrays;

public class Main {

public static void main(String[] args) {

FastPFOR128 fastpfor = new FastPFOR128();

int N = 9984;

int[] data = new int[N];

for (var i = 0; i < N; i += 150) {

data[i] = i;

}

int[] compressedoutput1 = new int[N + 1024];

IntWrapper inputoffset1 = new IntWrapper(0);

IntWrapper outputoffset1 = new IntWrapper(0);

fastpfor.compress(data, inputoffset1, N, compressedoutput1, outputoffset1);

int compressedsize1 = outputoffset1.get();

int[] recovered1 = new int[N];

inputoffset1 = new IntWrapper(0);

outputoffset1 = new IntWrapper(0);

fastpfor.uncompress(compressedoutput1, outputoffset1, compressedsize1, recovered1, inputoffset1);

// quick verification: count mismatches

int mismatches = 0;

for (int i = 0; i < N; i++) {

if (data[i] != recovered1[i]) mismatches++;

}

System.out.println("N=" + N + " compressedSizeWords=" + compressedsize1 + " mismatches=" + mismatches);

System.out.println("first 20 original: " + Arrays.toString(Arrays.copyOf(data, 20)));

System.out.println("first 20 recovered: " + Arrays.toString(Arrays.copyOf(recovered1, 20)));

}