FilesExpand file tree

 master

/

Example.java

Copy path

Blame

More file actions

Blame

More file actions

Latest commit

 

History

History

History

67 lines (49 loc) · 2.06 KB

 master

/

Example.java

Top

File metadata and controls

• Code
• Blame

67 lines (49 loc) · 2.06 KB

Raw

Copy raw file

Download raw file

Open symbols panel

Edit and raw actions

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

67

// Copyright (C) 2022 Intel Corporation

// SPDX-License-Identifier: Apache-2.0

import java.util.Arrays;

import me.lemire.integercompression.FastPFOR;

import me.lemire.integercompression.IntWrapper;

import me.lemire.integercompression.Composition;

import me.lemire.integercompression.IntegerCODEC;

import me.lemire.integercompression.VariableByte;

import me.lemire.integercompression.vector.VectorFastPFOR;

public class Example {

public static void main(String[] args) {

if (args.length == 0)

throw new IllegalArgumentException();

// pass 0 for Vector compressor , non-zero for default compressor

int compressorToUse = Integer.parseInt(args[0]);

final int N = 1310720;

int[] data = new int[N];

// 2-bit data

for (int k = 0; k < N; k += 1)

data[k] = 3;

// a few large values

for (int k = 0; k < N; k += 5)

data[k] = 100;

for (int k = 0; k < N; k += 533)

data[k] = 10000;

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

IntegerCODEC codec = new Composition(

compressorToUse == 0 ? new VectorFastPFOR() : new FastPFOR(),

new VariableByte());

IntWrapper inputoffset = new IntWrapper(0);

IntWrapper outputoffset = new IntWrapper(0);

codec.compress(data, inputoffset, data.length, compressed, outputoffset);

System.out.println("compressed unsorted integers from " +

data.length * 4 / 1024 + "KB to " +

outputoffset.intValue() * 4 / 1024 + "KB");

compressed = Arrays.copyOf(compressed, outputoffset.intValue());

int[] recovered = new int[N];

IntWrapper recoffset = new IntWrapper(0);

codec.uncompress(compressed, new IntWrapper(0), compressed.length,

recovered, recoffset);

System.out.println("compressed length = " + compressed.length +

", uncompressed length = " + recoffset.intValue());

if (Arrays.equals(data, recovered))

System.out.println("data is recovered without loss");

else

throw new RuntimeException("bug"); // could use assert

System.out.println();

}

}