private byte[] Decompress(byte[] compressed, byte[] dictionaryRaw)
{
using (var memoryStream = new MemoryStream(compressed))
using (var compressionStream = new ZstandardStream(memoryStream, CompressionMode.Decompress))
using (var dictionary = new ZstandardDictionary(dictionaryRaw))
using (var temp = new MemoryStream())
{
compressionStream.CompressionDictionary = dictionary;
compressionStream.CopyTo(temp);
return(temp.ToArray());
}
}
//-----------------------------------------------------------------------------------------
private byte[] Compress(byte[] data, byte[] dictionaryRaw, int compressionLevel)
{
using (var memoryStream = new MemoryStream())
using (var compressionStream = new ZstandardStream(memoryStream, CompressionMode.Compress))
using (var dictionary = new ZstandardDictionary(dictionaryRaw))
{
compressionStream.CompressionLevel = compressionLevel;
compressionStream.CompressionDictionary = dictionary;
compressionStream.Write(data, 0, data.Length);
compressionStream.Close();
return(memoryStream.ToArray());
}
}
static void Main(string[] args)
{
var version = ZstandardStream.Version;
var maxCompressionLevel = ZstandardStream.MaxCompressionLevel;
// var input1 = GetTestFile("kennedy.xls");
// StandardCompression(input1, 6);
// Console.ReadLine();
var input2 = File.ReadAllBytes("loremipsum.txt");
var dictionary = new ZstandardDictionary("loremipsum.zdict");
StandardCompression(input2, 22);
DictionaryCompression(input2, dictionary, 22);
Console.ReadLine();
}
//-----------------------------------------------------------------------------------------
//-----------------------------------------------------------------------------------------
private static void DictionaryCompression(byte[] input, ZstandardDictionary dictionary, int compressionLevel)
{
var stopwatch = Stopwatch.StartNew();
var compressed = default(byte[]);
var output = default(byte[]);
// compress
using (var memoryStream = new MemoryStream())
using (var compressionStream = new ZstandardStream(memoryStream, CompressionMode.Compress))
{
compressionStream.CompressionLevel = compressionLevel;
compressionStream.CompressionDictionary = dictionary;
compressionStream.Write(input, 0, input.Length);
compressionStream.Close();
compressed = memoryStream.ToArray();
}
// decompress
using (var memoryStream = new MemoryStream(compressed))
using (var compressionStream = new ZstandardStream(memoryStream, CompressionMode.Decompress))
using (var temp = new MemoryStream())
{
compressionStream.CompressionDictionary = dictionary;
compressionStream.CopyTo(temp);
output = temp.ToArray();
}
// test output
if (output.SequenceEqual(input) == false)
{
throw new Exception("Output is different from input!");
}
// write info
Console.WriteLine($"Input : {input.Length}");
Console.WriteLine($"Compressed : {compressed.Length}");
Console.WriteLine($"Output : {output.Length}");
Console.WriteLine($"-------------------------------------------");
Console.WriteLine($"Ratio : {1.0f * input.Length / compressed.Length}");
Console.WriteLine($"Time : {stopwatch.Elapsed.TotalMilliseconds} ms");
Console.WriteLine($"Is64Bit : {Environment.Is64BitProcess}");
Console.WriteLine();
}
