public void Zlib_DeflateStream_InMemory()
{
String TextToCompress = UntilHeExtends;
CompressionLevel[] levels = {CompressionLevel.Level0,
CompressionLevel.Level1,
CompressionLevel.Default,
CompressionLevel.Level7,
CompressionLevel.BestCompression};
// compress with various Ionic levels, and System.IO.Compression (default level)
for (int k= 0; k < levels.Length + 1; k++)
{
MemoryStream ms= new MemoryStream();
Stream compressor = null;
if (k == levels.Length)
compressor = new System.IO.Compression.DeflateStream(ms, System.IO.Compression.CompressionMode.Compress, false);
else
{
compressor = new Ionic.Zlib.DeflateStream(ms, CompressionMode.Compress, levels[k], false);
TestContext.WriteLine("using level: {0}", levels[k].ToString());
}
TestContext.WriteLine("Text to compress is {0} bytes: '{1}'",
TextToCompress.Length, TextToCompress);
TestContext.WriteLine("using compressor: {0}", compressor.GetType().FullName);
StreamWriter sw = new StreamWriter(compressor, System.Text.Encoding.ASCII);
sw.Write(TextToCompress);
sw.Close();
var a = ms.ToArray();
TestContext.WriteLine("Compressed stream is {0} bytes long", a.Length);
// de-compress with both Ionic and System.IO.Compression
for (int j = 0; j < 2; j++)
{
var slow = new MySlowMemoryStream(a); // want to force EOF
Stream decompressor = null;
switch (j)
{
case 0:
decompressor = new Ionic.Zlib.DeflateStream(slow, CompressionMode.Decompress, false);
break;
case 1:
decompressor = new System.IO.Compression.DeflateStream(slow, System.IO.Compression.CompressionMode.Decompress, false);
break;
}
TestContext.WriteLine("using decompressor: {0}", decompressor.GetType().FullName);
var sr = new StreamReader(decompressor, System.Text.Encoding.ASCII);
string DecompressedText = sr.ReadToEnd();
TestContext.WriteLine("Read {0} characters: '{1}'", DecompressedText.Length, DecompressedText);
TestContext.WriteLine("\n");
Assert.AreEqual<String>(TextToCompress, DecompressedText);
}
}
}