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IntCompressor.cs
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67 lines (57 loc) · 1.8 KB
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/**
* This is a convenience class that wraps a codec to provide
* a "friendly" API.
*
*/
using CSharpFastPFOR.Port;
namespace CSharpFastPFOR
{
public class IntCompressor
{
private SkippableIntegerCODEC codec;
/**
* Constructor wrapping a codec.
*
* @param c the underlying codec
*/
public IntCompressor(SkippableIntegerCODEC c)
{
codec = c;
}
/**
* Constructor with default codec.
*/
public IntCompressor()
{
codec = new SkippableComposition(new BinaryPacking(), new VariableByte());
}
/**
* Compress an array and returns the compressed result as a new array.
*
* @param input array to be compressed
* @return compressed array
*/
public int[] compress(int[] input)
{
int[] compressed = new int[input.Length + 1024];
compressed[0] = input.Length;
IntWrapper outpos = new IntWrapper(1);
codec.headlessCompress(input, new IntWrapper(0), input.Length, compressed, outpos);
compressed = Arrays.copyOf(compressed, outpos.intValue());
return compressed;
}
/**
* Uncompress an array and returns the uncompressed result as a new array.
*
* @param compressed compressed array
* @return uncompressed array
*/
public int[] uncompress(int[] compressed)
{
int[] decompressed = new int[compressed[0]];
IntWrapper inpos = new IntWrapper(1);
codec.headlessUncompress(compressed, inpos, compressed.Length - inpos.intValue(), decompressed, new IntWrapper(0), decompressed.Length);
return decompressed;
}
}
}