public void Lz4Legacy_Flush()
{
// Verify behavior of flushing a compression stream
using (MemoryStream compressed = new MemoryStream())
{
using (Lz4LegacyWriter stream = new Lz4LegacyWriter(compressed, true))
{
stream.Write(s_sampledata, 0, s_sampledata.Length);
// Get the unflushed length of the compressed stream and flush it
long unflushed = compressed.Length;
stream.Flush();
// The expectation is that the output stream will be longer after the flush
long flushedonce = compressed.Length;
Assert.IsTrue(compressed.Length > unflushed);
// Flushing the same data a second time should not have any impact at all
stream.Flush();
Assert.AreEqual(compressed.Length, flushedonce);
// The stream should still be writable after a flush operation
stream.Write(s_sampledata, 0, s_sampledata.Length / 10);
}
}
// Verify behavior of flushing a decompression stream
using (Lz4LegacyReader stream = new Lz4LegacyReader(new MemoryStream(s_sampledata)))
{
// Flush has no effect on decompression streams, just ensure it doesn't throw
stream.Flush();
}
}
public void Lz4Legacy_CompressDecompress()
{
// 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
using (Lz4LegacyWriter compressor = new Lz4LegacyWriter(dest, CompressionLevel.Optimal, true)) source.CopyTo(compressor);
// 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 (Lz4LegacyReader decompressor = new Lz4LegacyReader(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 Lz4Legacy_Seek()
{
// Verify behavior of a compression stream
using (Lz4LegacyWriter stream = new Lz4LegacyWriter(new MemoryStream()))
{
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)); }
}
// Verify behavior of a decompression stream
using (Lz4LegacyReader stream = new Lz4LegacyReader(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 Lz4Legacy_Read()
{
byte[] buffer = new byte[8192]; // 8KiB data buffer
using (MemoryStream compressed = new MemoryStream())
{
// Start with a compressed MemoryStream created from the sample data
using (Lz4LegacyWriter compressor = new Lz4LegacyWriter(compressed, CompressionLevel.Optimal, true))
{
try { compressor.Read(buffer, 0, 8192); Assert.Fail("Method call should have thrown an exception"); }
catch (Exception ex) { Assert.IsInstanceOfType(ex, typeof(NotSupportedException)); }
compressor.Write(s_sampledata, 0, s_sampledata.Length);
compressor.Flush();
}
// Check the constructor for ArgumentNullException while we're here
try { using (Lz4LegacyReader decompressor = new Lz4LegacyReader(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 (Lz4LegacyReader decompressor = new Lz4LegacyReader(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)); }
// Attempting to read from the middle of the compressed stream should throw an InvalidDataException
compressed.Position = compressed.Position / 2;
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 (Lz4LegacyReader decompressor = new Lz4LegacyReader(compressed, true))
{
// Reading zero bytes should not throw an exception
decompressor.Read(buffer, 0, 0);
while (decompressor.Read(buffer, 0, 8192) != 0)
{
}
}
}
}
public void Lz4Legacy_CompressExternal()
{
// This method generates an output file that can be tested externally; "thethreemusketeers.txt" is
// set to Copy Always to the output directory, it can be diffed after running the external tool
using (Lz4LegacyWriter writer = new Lz4LegacyWriter(File.Create(Path.Combine(Environment.CurrentDirectory, "thethreemusketeers.lz4-legacy"))))
{
writer.Write(s_sampledata);
writer.Flush();
}
}
public void Lz4Legacy_CanWrite()
{
// Verify behavior of a compression stream
using (Lz4LegacyWriter stream = new Lz4LegacyWriter(new MemoryStream()))
{
Assert.IsTrue(stream.CanWrite);
}
// Verify behavior of a decompression stream
using (Lz4LegacyReader stream = new Lz4LegacyReader(new MemoryStream(s_sampledata)))
{
Assert.IsFalse(stream.CanWrite);
}
}
public void Lz4Legacy_SetLength()
{
// Verify behavior of a compression stream
using (Lz4LegacyWriter stream = new Lz4LegacyWriter(new MemoryStream()))
{
try { stream.SetLength(12345L); Assert.Fail("Method call should have thrown an exception"); }
catch (Exception ex) { Assert.IsInstanceOfType(ex, typeof(NotSupportedException)); }
}
// Verify behavior of a decompression stream
using (Lz4LegacyReader stream = new Lz4LegacyReader(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 Lz4Legacy_BaseStream()
{
using (MemoryStream source = new MemoryStream())
{
using (Lz4LegacyWriter stream = new Lz4LegacyWriter(source, CompressionLevel.Optimal))
{
Assert.IsNotNull(stream.BaseStream);
Assert.AreSame(source, stream.BaseStream);
}
using (Lz4LegacyReader stream = new Lz4LegacyReader(source, true))
{
Assert.IsNotNull(stream.BaseStream);
Assert.AreSame(source, stream.BaseStream);
}
}
}
public void Lz4Legacy_Write()
{
byte[] buffer = new byte[8192]; // 8KiB data buffer
// Compress the sample data using a call to Write directly
using (MemoryStream compressed = new MemoryStream())
{
// Check the constructor for ArgumentNullException while we're here
try { using (Lz4LegacyWriter compressor = new Lz4LegacyWriter(null)) { }; Assert.Fail("Constructor should have thrown an exception"); }
catch (Exception ex) { Assert.IsInstanceOfType(ex, typeof(ArgumentNullException)); }
using (Lz4LegacyWriter compressor = new Lz4LegacyWriter(compressed, CompressionLevel.Optimal, true))
{
// Send in some bum arguments to Write() to check they are caught
try { compressor.Write(null); Assert.Fail("Method call should have thrown an exception"); }
catch (Exception ex) { Assert.IsInstanceOfType(ex, typeof(ArgumentNullException)); }
try { compressor.Write(null, 0, 0); Assert.Fail("Method call should have thrown an exception"); }
catch (Exception ex) { Assert.IsInstanceOfType(ex, typeof(ArgumentNullException)); }
try { compressor.Write(s_sampledata, -1, 0); Assert.Fail("Method call should have thrown an exception"); }
catch (Exception ex) { Assert.IsInstanceOfType(ex, typeof(ArgumentOutOfRangeException)); }
try { compressor.Write(s_sampledata, 0, -1); Assert.Fail("Method call should have thrown an exception"); }
catch (Exception ex) { Assert.IsInstanceOfType(ex, typeof(ArgumentOutOfRangeException)); }
try { compressor.Write(s_sampledata, 0, s_sampledata.Length + 1024); Assert.Fail("Method call should have thrown an exception"); }
catch (Exception ex) { Assert.IsInstanceOfType(ex, typeof(ArgumentException)); }
// Not writing anything shouldn't throw an exception
compressor.Write(s_sampledata, 0, 0);
// Compress the data; there really isn't much that can go wrong with Write() itself
compressor.Write(s_sampledata, 0, s_sampledata.Length);
compressor.Flush();
}
using (Lz4LegacyReader reader = new Lz4LegacyReader(compressed, true))
{
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 Lz4Legacy_CompressionLevel()
{
using (MemoryStream source = new MemoryStream(s_sampledata))
{
long fastest, optimal; // Size of compressed streams
// CompressionLevel.NoCompression is not valid
try { using (Lz4LegacyWriter stream = new Lz4LegacyWriter(source, CompressionLevel.NoCompression)) Assert.Fail("Method call should have thrown an exception"); }
catch (Exception ex) { Assert.IsInstanceOfType(ex, typeof(ArgumentOutOfRangeException)); }
// Compress using CompressionLevel.Fastest
using (MemoryStream compressed = new MemoryStream())
{
using (Lz4LegacyWriter compressor = new Lz4LegacyWriter(compressed, CompressionLevel.Fastest))
{
compressor.Write(s_sampledata, 0, s_sampledata.Length);
compressor.Flush();
fastest = compressed.Length;
}
}
// Compress using CompressionLevel.Optimal
using (MemoryStream compressed = new MemoryStream())
{
using (Lz4LegacyWriter compressor = new Lz4LegacyWriter(compressed, CompressionLevel.Optimal))
{
compressor.Write(s_sampledata, 0, s_sampledata.Length);
compressor.Flush();
optimal = compressed.Length;
}
}
// Optimal compression should result in a smaller output stream than fastest
// and fastest should result in a smaller output stream than uncompressed
Assert.IsTrue(optimal < fastest);
Assert.IsTrue(fastest < source.Length);
}
}
public void Lz4Legacy_Position()
{
// Start with a MemoryStream created from the sample data
using (MemoryStream source = new MemoryStream(s_sampledata))
{
using (MemoryStream dest = new MemoryStream())
{
// Test a compression stream
using (Lz4LegacyWriter compressor = new Lz4LegacyWriter(dest, CompressionLevel.Optimal, true))
{
// Lz4Legacy streams do not report position
try { var pos = compressor.Position; Assert.Fail("Property should have thrown an exception"); }
catch (Exception ex) { Assert.IsInstanceOfType(ex, typeof(NotSupportedException)); }
// Attempting to set the position on the stream should throw
try { compressor.Position = 12345L; Assert.Fail("Property should have thrown an exception"); }
catch (Exception ex) { Assert.IsInstanceOfType(ex, typeof(NotSupportedException)); }
}
source.SetLength(0); // Clear the source stream
dest.Position = 0; // Reset the destination stream
// Test a decompression stream
using (Lz4LegacyReader decompressor = new Lz4LegacyReader(dest, true))
{
// Lz4Legacy streams do not report position
try { var pos = decompressor.Position; Assert.Fail("Property should have thrown an exception"); }
catch (Exception ex) { Assert.IsInstanceOfType(ex, typeof(NotSupportedException)); }
// Attempting to set the position on the stream should throw
try { decompressor.Position = 12345L; Assert.Fail("Property should have thrown an exception"); }
catch (Exception ex) { Assert.IsInstanceOfType(ex, typeof(NotSupportedException)); }
}
}
}
}
public void Lz4Legacy_Encoder()
{
// The Lz4LegacyEncoder is just a wrapper around Lz4LegacyWriter
Lz4LegacyEncoder encoder = new Lz4LegacyEncoder();
// Check the default values
Assert.AreEqual(Lz4CompressionLevel.Default, encoder.CompressionLevel);
// Set and reset encoder parameters to exercise the property setters
encoder.CompressionLevel = Lz4CompressionLevel.Fastest;
Assert.AreEqual(Lz4CompressionLevel.Fastest, encoder.CompressionLevel);
encoder.CompressionLevel = Lz4CompressionLevel.Default;
Assert.AreEqual(Lz4CompressionLevel.Default, encoder.CompressionLevel);
// Check all of the Encoder methods work and encode as expected
byte[] expected, actual;
using (MemoryStream ms = new MemoryStream())
{
// Use Lz4LegacyWriter here as a secondary test rather than checking encoder against itself
using (var writer = new Lz4LegacyWriter(ms, true)) { writer.Write(s_sampledata, 0, s_sampledata.Length); }
expected = ms.ToArray();
}
// Check parameter validations
try { actual = encoder.Encode((byte[])null); Assert.Fail("Method call should have thrown an exception"); }
catch (Exception ex) { Assert.IsInstanceOfType(ex, typeof(ArgumentNullException)); }
try { actual = encoder.Encode((Stream)null); Assert.Fail("Method call should have thrown an exception"); }
catch (Exception ex) { Assert.IsInstanceOfType(ex, typeof(ArgumentNullException)); }
try { actual = encoder.Encode(null, 0, 0); Assert.Fail("Method call should have thrown an exception"); }
catch (Exception ex) { Assert.IsInstanceOfType(ex, typeof(ArgumentNullException)); }
try { encoder.Encode(s_sampledata, null); Assert.Fail("Method call should have thrown an exception"); }
catch (Exception ex) { Assert.IsInstanceOfType(ex, typeof(ArgumentNullException)); }
try { encoder.Encode((byte[])null, new MemoryStream()); Assert.Fail("Method call should have thrown an exception"); }
catch (Exception ex) { Assert.IsInstanceOfType(ex, typeof(ArgumentNullException)); }
try { encoder.Encode((byte[])null, 0, 0, new MemoryStream()); Assert.Fail("Method call should have thrown an exception"); }
catch (Exception ex) { Assert.IsInstanceOfType(ex, typeof(ArgumentNullException)); }
try { encoder.Encode(s_sampledata, 0, s_sampledata.Length, (Stream)null); Assert.Fail("Method call should have thrown an exception"); }
catch (Exception ex) { Assert.IsInstanceOfType(ex, typeof(ArgumentNullException)); }
try { encoder.Encode((Stream)null, new MemoryStream()); Assert.Fail("Method call should have thrown an exception"); }
catch (Exception ex) { Assert.IsInstanceOfType(ex, typeof(ArgumentNullException)); }
try { encoder.Encode(new MemoryStream(), (Stream)null); Assert.Fail("Method call should have thrown an exception"); }
catch (Exception ex) { Assert.IsInstanceOfType(ex, typeof(ArgumentNullException)); }
// Check actual encoding operations
actual = encoder.Encode(s_sampledata);
Assert.IsTrue(Enumerable.SequenceEqual(expected, actual));
actual = encoder.Encode(new MemoryStream(s_sampledata));
Assert.IsTrue(Enumerable.SequenceEqual(expected, actual));
actual = encoder.Encode(s_sampledata, 0, s_sampledata.Length);
Assert.IsTrue(Enumerable.SequenceEqual(expected, actual));
using (MemoryStream dest = new MemoryStream())
{
encoder.Encode(s_sampledata, dest);
Assert.IsTrue(Enumerable.SequenceEqual(expected, dest.ToArray()));
}
using (MemoryStream dest = new MemoryStream())
{
encoder.Encode(new MemoryStream(s_sampledata), dest);
Assert.IsTrue(Enumerable.SequenceEqual(expected, dest.ToArray()));
}
using (MemoryStream dest = new MemoryStream())
{
encoder.Encode(s_sampledata, 0, s_sampledata.Length, dest);
Assert.IsTrue(Enumerable.SequenceEqual(expected, dest.ToArray()));
}
}
public void Lz4Legacy_WriterDispose()
{
byte[] buffer = new byte[8192]; // 8KiB data buffer
// Create a dummy stream and immediately dispose of it
Lz4LegacyWriter stream = new Lz4LegacyWriter(new MemoryStream(s_sampledata), CompressionLevel.Optimal);
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); 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)); }
// Ensure that an underlying stream is disposed of properly if leaveopen is not set
MemoryStream ms = new MemoryStream(s_sampledata);
using (Lz4LegacyWriter compressor = new Lz4LegacyWriter(ms, CompressionLevel.Fastest)) { }
try { ms.Write(buffer, 0, 8192); Assert.Fail("Method call should have thrown an exception"); }
catch (Exception ex) { Assert.IsInstanceOfType(ex, typeof(ObjectDisposedException)); }
// Ensure that an underlying stream is not disposed of if leaveopen is set
ms = new MemoryStream(s_sampledata);
using (Lz4LegacyWriter compressor = new Lz4LegacyWriter(ms, CompressionLevel.Fastest, true)) { }
ms.Write(buffer, 0, 8192);
ms.Dispose();
}