public async Task <byte[]> Decompress(CompressionType type, byte[] compressed)
{
if (type != CompressionType.LZ4)
{
throw new ArgumentException("Only LZ4 Compression is supported at the moment.");
}
return(await Task.Run(() =>
{
LZ4Compressor comp = new LZ4Compressor("", K4os.Compression.LZ4.LZ4Level.L12_MAX);
return comp.Decompress(compressed);
}));
}
internal void LZ4Compressor_CanCompressAndDecompress()
{
// Arrange
var message = "hello world!";
var compressor = new LZ4Compressor();
// Act
var messageBytes = Encoding.UTF8.GetBytes(message);
var compressed = compressor.Compress(messageBytes);
var decompressed = compressor.Decompress(compressed);
// Assert
Assert.Equal(message, Encoding.UTF8.GetString(decompressed));
this.Output.WriteLine(BitConverter.ToString(compressed));
}
internal void LZ4Compressor_DecompressFromPython()
{
// Arrange
var message = "hello world!";
var expected = Encoding.UTF8.GetBytes(message);
var compressor = new LZ4Compressor();
var fromPython = Convert.FromBase64String("BCJNGGhADAAAAAAAAABdDAAAgGhlbGxvIHdvcmxkIQAAAAA=");
this.Output.WriteLine(Encoding.UTF8.GetString(fromPython));
// Act
var decompressed = compressor.Decompress(fromPython);
// Assert
Assert.Equal(expected, decompressed);
}
public void LZ4_Read_Write_Faster_Than_GZip()
{
var gzipCompressor = new GZipCompressor();
var lz4Compressor = new LZ4Compressor();
double gzipSeconds = 0;
double lz4Seconds = 0;
Stopwatch watch = new Stopwatch();
watch.Start();
for (int i = 0; i < 1000; i++)
{
byte[] data = TestHelper.GetRandomByteArray(10);
byte[] compressed = gzipCompressor.Compress(data);
byte[] deflated = gzipCompressor.Decompress(compressed);
Assert.IsTrue(data.SequenceEqual(deflated));
}
watch.Stop();
gzipSeconds = watch.Elapsed.TotalSeconds;
watch = new Stopwatch();
watch.Start();
for (int i = 0; i < 1000; i++)
{
byte[] data = TestHelper.GetRandomByteArray(10);
byte[] compressed = lz4Compressor.Compress(data);
byte[] deflated = lz4Compressor.Decompress(compressed);
Assert.IsTrue(data.SequenceEqual(deflated));
}
watch.Stop();
lz4Seconds = watch.Elapsed.TotalSeconds;
Assert.IsTrue(lz4Seconds < gzipSeconds);
}
