public void Xz_EncoderCheckSHA256()
{
// Start with a MemoryStream created from the sample data
using (MemoryStream source = new MemoryStream(s_sampledata))
{
using (MemoryStream dest = new MemoryStream())
{
// Compress the data into the destination memory stream instance
XzEncoder encoder = new XzEncoder();
encoder.Checksum = XzChecksum.SHA256;
encoder.Encode(source, dest);
// The compressed data should be smaller than the source data
Assert.IsTrue(dest.Length < source.Length);
source.SetLength(0); // Clear the source stream
dest.Position = 0; // Reset the destination stream
// Decompress the data back into the source memory stream
using (XzReader decompressor = new XzReader(dest, true)) decompressor.CopyTo(source);
// Ensure that the original data has been restored
Assert.AreEqual(source.Length, s_sampledata.Length);
Assert.IsTrue(s_sampledata.SequenceEqual(source.ToArray()));
}
}
}
public void Xz_CanWrite()
{
// Verify behavior of a decompression stream
using (XzReader stream = new XzReader(new MemoryStream(s_sampledata)))
{
Assert.IsFalse(stream.CanWrite);
}
}
public void Xz_SetLength()
{
// Verify behavior of a decompression stream
using (XzReader stream = new XzReader(new MemoryStream(s_sampledata)))
{
try { stream.SetLength(12345L); Assert.Fail("Method call should have thrown an exception"); }
catch (Exception ex) { Assert.IsInstanceOfType(ex, typeof(NotSupportedException)); }
}
}
public void Xz_Flush()
{
// Verify behavior of flushing a decompression stream
using (XzReader stream = new XzReader(new MemoryStream(s_sampledata)))
{
// Flush has no effect on decompression streams, just ensure it doesn't throw
stream.Flush();
}
}
public void Xz_Dispose()
{
byte[] buffer = new byte[8192]; // 8KiB data buffer
// Create a memorystream to hold the compressed sample data
using (MemoryStream ms = new MemoryStream())
{
XzEncoder encoder = new XzEncoder();
encoder.Encode(s_sampledata, ms);
// Create a decompression stream and immediately dispose of it
XzReader stream = new XzReader(ms);
stream.Dispose();
// Test double dispose
stream.Dispose();
// All properties and methods should throw an ObjectDisposedException
try { var bs = stream.BaseStream; Assert.Fail("Property access should have thrown an exception"); }
catch (Exception ex) { Assert.IsInstanceOfType(ex, typeof(ObjectDisposedException)); }
try { var b = stream.CanRead; Assert.Fail("Property access should have thrown an exception"); }
catch (Exception ex) { Assert.IsInstanceOfType(ex, typeof(ObjectDisposedException)); }
try { var b = stream.CanSeek; Assert.Fail("Property access should have thrown an exception"); }
catch (Exception ex) { Assert.IsInstanceOfType(ex, typeof(ObjectDisposedException)); }
try { var b = stream.CanWrite; Assert.Fail("Property access should have thrown an exception"); }
catch (Exception ex) { Assert.IsInstanceOfType(ex, typeof(ObjectDisposedException)); }
try { stream.Flush(); Assert.Fail("Method call should have thrown an exception"); }
catch (Exception ex) { Assert.IsInstanceOfType(ex, typeof(ObjectDisposedException)); }
try { var l = stream.Length; Assert.Fail("Property access should have thrown an exception"); }
catch (Exception ex) { Assert.IsInstanceOfType(ex, typeof(ObjectDisposedException)); }
try { var l = stream.Position; Assert.Fail("Property access should have thrown an exception"); }
catch (Exception ex) { Assert.IsInstanceOfType(ex, typeof(ObjectDisposedException)); }
try { stream.Position = 12345L; Assert.Fail("Property access should have thrown an exception"); }
catch (Exception ex) { Assert.IsInstanceOfType(ex, typeof(ObjectDisposedException)); }
try { stream.Read(buffer, 0, 8192); Assert.Fail("Method call should have thrown an exception"); }
catch (Exception ex) { Assert.IsInstanceOfType(ex, typeof(ObjectDisposedException)); }
try { stream.Seek(0, SeekOrigin.Current); Assert.Fail("Method call should have thrown an exception"); }
catch (Exception ex) { Assert.IsInstanceOfType(ex, typeof(ObjectDisposedException)); }
try { stream.SetLength(12345L); Assert.Fail("Method call should have thrown an exception"); }
catch (Exception ex) { Assert.IsInstanceOfType(ex, typeof(ObjectDisposedException)); }
try { stream.Write(buffer, 0, 8192); Assert.Fail("Method call should have thrown an exception"); }
catch (Exception ex) { Assert.IsInstanceOfType(ex, typeof(ObjectDisposedException)); }
}
}
public void Xz_Write()
{
XzEncoder encoder = new XzEncoder();
var compressed = encoder.Encode(s_sampledata);
using (XzReader reader = new XzReader(new MemoryStream(compressed)))
{
byte[] buffer = new byte[2048];
try { reader.Write(buffer, 0, buffer.Length); Assert.Fail("Method call should have thrown an exception"); }
catch (Exception ex) { Assert.IsInstanceOfType(ex, typeof(NotSupportedException)); }
}
}
public void Xz_BaseStream()
{
using (MemoryStream dest = new MemoryStream())
{
XzEncoder encoder = new XzEncoder();
encoder.Encode(s_sampledata, dest);
using (XzReader stream = new XzReader(dest))
{
Assert.IsNotNull(stream.BaseStream);
Assert.AreSame(dest, stream.BaseStream);
}
}
}
public void Xz_DecompressExternal()
{
// Decompress a stream created externally to this library
using (XzReader reader = new XzReader(Assembly.GetExecutingAssembly().GetManifestResourceStream("zuki.io.compression.test.thethreemusketeers.xz")))
{
using (MemoryStream dest = new MemoryStream())
{
reader.CopyTo(dest);
dest.Flush();
// Verify that the output matches the sample data byte-for-byte
Assert.IsTrue(Enumerable.SequenceEqual(s_sampledata, dest.ToArray()));
}
}
}
public void Xz_Seek()
{
// Verify behavior of a decompression stream
using (XzReader stream = new XzReader(new MemoryStream(s_sampledata)))
{
try { stream.Seek(50, SeekOrigin.Begin); Assert.Fail("Method call should have thrown an exception"); }
catch (Exception ex) { Assert.IsInstanceOfType(ex, typeof(NotSupportedException)); }
try { stream.Seek(0, SeekOrigin.Current); Assert.Fail("Method call should have thrown an exception"); }
catch (Exception ex) { Assert.IsInstanceOfType(ex, typeof(NotSupportedException)); }
try { stream.Seek(-50, SeekOrigin.End); Assert.Fail("Method call should have thrown an exception"); }
catch (Exception ex) { Assert.IsInstanceOfType(ex, typeof(NotSupportedException)); }
}
}
public void Xz_Read()
{
byte[] buffer = new byte[8192]; // 8KiB data buffer
using (MemoryStream compressed = new MemoryStream())
{
XzEncoder encoder = new XzEncoder();
encoder.Encode(s_sampledata, compressed);
compressed.Flush();
// Check the constructor for ArgumentNullException while we're here
try { using (XzReader decompressor = new XzReader(null, false)) { }; Assert.Fail("Constructor should have thrown an exception"); }
catch (Exception ex) { Assert.IsInstanceOfType(ex, typeof(ArgumentNullException)); }
// Create a decompressor to test some of the error cases
using (XzReader decompressor = new XzReader(compressed, true))
{
// Send in some bum arguments to Read() to check they are caught
try { decompressor.Read(null, 0, 0); Assert.Fail("Method call should have thrown an exception"); }
catch (Exception ex) { Assert.IsInstanceOfType(ex, typeof(ArgumentNullException)); }
try { decompressor.Read(buffer, -1, 0); Assert.Fail("Method call should have thrown an exception"); }
catch (Exception ex) { Assert.IsInstanceOfType(ex, typeof(ArgumentOutOfRangeException)); }
try { decompressor.Read(buffer, 0, -1); Assert.Fail("Method call should have thrown an exception"); }
catch (Exception ex) { Assert.IsInstanceOfType(ex, typeof(ArgumentOutOfRangeException)); }
try { decompressor.Read(buffer, 0, buffer.Length + 1024); Assert.Fail("Method call should have thrown an exception"); }
catch (Exception ex) { Assert.IsInstanceOfType(ex, typeof(ArgumentException)); }
// Attempting to read from the end of the compressed stream should throw an InvalidDataException
try { decompressor.Read(buffer, 0, 8192); Assert.Fail("Method call should have thrown an exception"); }
catch (Exception ex) { Assert.IsInstanceOfType(ex, typeof(InvalidDataException)); }
}
// Create a new decompressor against the same stream and make sure it doesn't throw
compressed.Position = 0;
using (XzReader decompressor = new XzReader(compressed, true))
{
// Reading zero bytes should not throw an exception
decompressor.Read(buffer, 0, 0);
while (decompressor.Read(buffer, 0, 8192) != 0)
{
}
}
}
}
public void Xz_LzmaException()
{
using (MemoryStream compressed = new MemoryStream())
{
XzEncoder encoder = new XzEncoder();
encoder.CompressionLevel = LzmaCompressionLevel.Optimal;
encoder.Encode(s_sampledata, compressed);
compressed.Flush();
byte[] buffer = new byte[8192];
LzmaException thrown = null;
LzmaException deserialized = null;
// Create a decompressor to test exception cases
using (XzReader decompressor = new XzReader(compressed, true))
{
// Attempting to read from the middle of the compressed stream should throw a LzmaException
compressed.Position = compressed.Length / 2;
try { decompressor.Read(buffer, 0, 8192); Assert.Fail("Method call should have thrown an exception"); }
catch (LzmaException ex) { thrown = ex; }
Assert.IsNotNull(thrown);
Assert.IsInstanceOfType(thrown, typeof(LzmaException));
// Check the error code property
Assert.AreEqual(17, thrown.ErrorCode); // SZ_ERROR_NO_ARCHIVE (17)
// Serialize and de-serialize the exception with a BinaryFormatter
BinaryFormatter formatter = new BinaryFormatter();
using (MemoryStream memstream = new MemoryStream())
{
formatter.Serialize(memstream, thrown);
memstream.Seek(0, 0);
deserialized = (LzmaException)formatter.Deserialize(memstream);
}
// Check that the exceptions are equivalent
Assert.AreEqual(thrown.ErrorCode, deserialized.ErrorCode);
Assert.AreEqual(thrown.StackTrace, deserialized.StackTrace);
Assert.AreEqual(thrown.ToString(), deserialized.ToString());
}
}
}
public void Xz_Position()
{
// Start with a MemoryStream created from the sample data
using (MemoryStream compressed = new MemoryStream(s_sampledata))
{
XzEncoder encoder = new XzEncoder();
encoder.Encode(s_sampledata, compressed);
compressed.Position = 0;
using (XzReader reader = new XzReader(compressed))
{
// Attempting to set the position on the stream should throw
try { reader.Position = 12345L; Assert.Fail("Property should have thrown an exception"); }
catch (Exception ex) { Assert.IsInstanceOfType(ex, typeof(NotSupportedException)); }
// Read some data from the stream, position should still throw for XzReader
byte[] buffer = new byte[8192];
try { var p = reader.Position; Assert.Fail("Property should have thrown an exception"); }
catch (Exception ex) { Assert.IsInstanceOfType(ex, typeof(NotSupportedException)); }
}
}
}