public void Lzma_CompressDecompressNoEndMark()
{
using (MemoryStream dest = new MemoryStream())
{
// Compress the data into the destination memory stream instance using
// the raw sample data array and without an end mark. Since the length
// of the input data is known, the encoder will not enforce the end mark
LzmaEncoder encoder = new LzmaEncoder();
encoder.WriteEndMark = false;
encoder.Encode(s_sampledata, dest);
// The compressed data should be smaller than the source data
Assert.IsTrue(dest.Length < s_sampledata.Length);
// Decompress the data back into a new memory stream
using (MemoryStream uncompressed = new MemoryStream())
{
dest.Position = 0;
using (LzmaReader decompressor = new LzmaReader(dest, true)) decompressor.CopyTo(uncompressed);
// Ensure that the original data has been restored
Assert.AreEqual(uncompressed.Length, s_sampledata.Length);
Assert.IsTrue(s_sampledata.SequenceEqual(uncompressed.ToArray()));
}
}
}
public void Lzma_CompressDecompressEndMark()
{
// Start with a MemoryStream created from the sample data, when a stream is
// sent into the encoder an end mark is always written
using (MemoryStream source = new MemoryStream(s_sampledata))
{
using (MemoryStream dest = new MemoryStream())
{
// Compress the data into the destination memory stream instance
LzmaEncoder encoder = new LzmaEncoder();
encoder.WriteEndMark = true;
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 (LzmaReader decompressor = new LzmaReader(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 Lzma_Dispose()
{
byte[] buffer = new byte[8192]; // 8KiB data buffer
// Create a memorystream to hold the compressed sample data
using (MemoryStream ms = new MemoryStream())
{
LzmaEncoder encoder = new LzmaEncoder();
encoder.Encode(s_sampledata, ms);
// Create a decompression stream and immediately dispose of it
LzmaReader stream = new LzmaReader(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 Lzma_Write()
{
LzmaEncoder encoder = new LzmaEncoder();
var compressed = encoder.Encode(s_sampledata);
using (LzmaReader reader = new LzmaReader(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 Lzma_BaseStream()
{
using (MemoryStream dest = new MemoryStream())
{
LzmaEncoder encoder = new LzmaEncoder();
encoder.Encode(s_sampledata, dest);
using (LzmaReader stream = new LzmaReader(dest))
{
Assert.IsNotNull(stream.BaseStream);
Assert.AreSame(dest, stream.BaseStream);
}
}
}
public void Lzma_Read()
{
byte[] buffer = new byte[8192]; // 8KiB data buffer
using (MemoryStream compressed = new MemoryStream())
{
LzmaEncoder encoder = new LzmaEncoder();
encoder.Encode(s_sampledata, compressed);
compressed.Flush();
// Check the constructor for ArgumentNullException while we're here
try { using (LzmaReader decompressor = new LzmaReader(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 (LzmaReader decompressor = new LzmaReader(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 (LzmaReader decompressor = new LzmaReader(compressed, true))
{
// Reading zero bytes should not throw an exception
decompressor.Read(buffer, 0, 0);
while (decompressor.Read(buffer, 0, 8192) != 0)
{
}
}
}
}
public void Lzma_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
LzmaEncoder encoder = new LzmaEncoder();
// Don't use an endmark with this test, the commandline xz-utils version of "lzma" cannot decompress
// files with an endmark from what I can gather. Using 7-zip is recommended instead to test, it can
// open both flavors of LZMA and decompress them successfully
encoder.WriteEndMark = false;
using (var outfile = File.Create(Path.Combine(Environment.CurrentDirectory, "thethreemusketeers.lzma")))
{
encoder.Encode(s_sampledata, outfile);
outfile.Flush();
}
}
public void Lzma_Position()
{
// Start with a MemoryStream created from the sample data
using (MemoryStream compressed = new MemoryStream(s_sampledata))
{
LzmaEncoder encoder = new LzmaEncoder();
encoder.Encode(s_sampledata, compressed);
compressed.Position = 0;
using (LzmaReader reader = new LzmaReader(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 be non-zero
byte[] buffer = new byte[8192];
reader.Read(buffer, 0, 8192);
Assert.AreNotEqual(0L, reader.Position);
}
}
}
public void Lzma_Encoder()
{
LzmaEncoder encoder = new LzmaEncoder();
// Check the default values
Assert.AreEqual(LzmaCompressionLevel.Default, encoder.CompressionLevel);
Assert.AreEqual(LzmaCompressionMode.Default, encoder.CompressionMode);
Assert.AreEqual(LzmaDictionarySize.Default, encoder.DictionarySize);
Assert.AreEqual(LzmaFastBytes.Default, encoder.FastBytes);
Assert.AreEqual(LzmaHashBytes.Default, encoder.HashBytes);
Assert.AreEqual(LzmaLiteralContextBits.Default, encoder.LiteralContextBits);
Assert.AreEqual(LzmaLiteralPositionBits.Default, encoder.LiteralPositionBits);
Assert.AreEqual(LzmaMatchFindMode.Default, encoder.MatchFindMode);
Assert.AreEqual(LzmaMatchFindPasses.Default, encoder.MatchFindPasses);
Assert.AreEqual(LzmaPositionBits.Default, encoder.PositionBits);
Assert.AreEqual(true, encoder.UseMultipleThreads);
Assert.AreEqual(true, encoder.WriteEndMark);
// Set and reset encoder parameters to exercise the property setters
encoder.CompressionLevel = LzmaCompressionLevel.Fastest;
Assert.AreEqual(LzmaCompressionLevel.Fastest, encoder.CompressionLevel);
encoder.CompressionLevel = LzmaCompressionLevel.Default;
Assert.AreEqual(LzmaCompressionLevel.Default, encoder.CompressionLevel);
encoder.CompressionMode = LzmaCompressionMode.Fast;
Assert.AreEqual(LzmaCompressionMode.Fast, encoder.CompressionMode);
encoder.CompressionMode = LzmaCompressionMode.Default;
Assert.AreEqual(LzmaCompressionMode.Default, encoder.CompressionMode);
encoder.DictionarySize = LzmaDictionarySize.Maximum;
Assert.AreEqual(LzmaDictionarySize.Maximum, encoder.DictionarySize);
encoder.DictionarySize = LzmaDictionarySize.Default;
Assert.AreEqual(LzmaDictionarySize.Default, encoder.DictionarySize);
encoder.FastBytes = LzmaFastBytes.Maximum;
Assert.AreEqual(LzmaFastBytes.Maximum, encoder.FastBytes);
encoder.FastBytes = LzmaFastBytes.Default;
Assert.AreEqual(LzmaFastBytes.Default, encoder.FastBytes);
encoder.HashBytes = LzmaHashBytes.Maximum;
Assert.AreEqual(LzmaHashBytes.Maximum, encoder.HashBytes);
encoder.HashBytes = LzmaHashBytes.Default;
Assert.AreEqual(LzmaHashBytes.Default, encoder.HashBytes);
encoder.LiteralContextBits = LzmaLiteralContextBits.Maximum;
Assert.AreEqual(LzmaLiteralContextBits.Maximum, encoder.LiteralContextBits);
encoder.LiteralContextBits = LzmaLiteralContextBits.Default;
Assert.AreEqual(LzmaLiteralContextBits.Default, encoder.LiteralContextBits);
encoder.LiteralPositionBits = LzmaLiteralPositionBits.Maximum;
Assert.AreEqual(LzmaLiteralPositionBits.Maximum, encoder.LiteralPositionBits);
encoder.LiteralPositionBits = LzmaLiteralPositionBits.Default;
Assert.AreEqual(LzmaLiteralPositionBits.Default, encoder.LiteralPositionBits);
encoder.MatchFindMode = LzmaMatchFindMode.HashChain;
Assert.AreEqual(LzmaMatchFindMode.HashChain, encoder.MatchFindMode);
encoder.MatchFindMode = LzmaMatchFindMode.Default;
Assert.AreEqual(LzmaMatchFindMode.Default, encoder.MatchFindMode);
encoder.MatchFindPasses = LzmaMatchFindPasses.Maximum;
Assert.AreEqual(LzmaMatchFindPasses.Maximum, encoder.MatchFindPasses);
encoder.MatchFindPasses = LzmaMatchFindPasses.Default;
Assert.AreEqual(LzmaMatchFindPasses.Default, encoder.MatchFindPasses);
encoder.PositionBits = LzmaPositionBits.Maximum;
Assert.AreEqual(LzmaPositionBits.Maximum, encoder.PositionBits);
encoder.PositionBits = LzmaPositionBits.Default;
Assert.AreEqual(LzmaPositionBits.Default, encoder.PositionBits);
encoder.UseMultipleThreads = false;
Assert.AreEqual(false, encoder.UseMultipleThreads);
encoder.UseMultipleThreads = true;
Assert.AreEqual(true, encoder.UseMultipleThreads);
encoder.WriteEndMark = false;
Assert.AreEqual(false, encoder.WriteEndMark);
encoder.WriteEndMark = true;
Assert.AreEqual(true, encoder.WriteEndMark);
// Check all of the Encoder methods work and encode as expected
byte[] expected, expectedstreamed, actual;
// There are 2 expected results since when the length of the input
// is known it's encoded into the compressed stream
using (MemoryStream ms = new MemoryStream())
{
encoder.Encode(s_sampledata, ms);
ms.Flush();
expected = ms.ToArray();
}
using (MemoryStream ms = new MemoryStream())
{
encoder.Encode(new MemoryStream(s_sampledata), ms);
ms.Flush();
expectedstreamed = 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)); // length is known
actual = encoder.Encode(new MemoryStream(s_sampledata));
Assert.IsTrue(Enumerable.SequenceEqual(expectedstreamed, actual)); // length is not known
actual = encoder.Encode(s_sampledata, 0, s_sampledata.Length); // length is known
Assert.IsTrue(Enumerable.SequenceEqual(expected, actual));
using (MemoryStream dest = new MemoryStream())
{
encoder.Encode(s_sampledata, dest);
Assert.IsTrue(Enumerable.SequenceEqual(expected, dest.ToArray())); // length is known
}
using (MemoryStream dest = new MemoryStream())
{
encoder.Encode(new MemoryStream(s_sampledata), dest);
Assert.IsTrue(Enumerable.SequenceEqual(expectedstreamed, dest.ToArray())); // length is not known
}
using (MemoryStream dest = new MemoryStream())
{
encoder.Encode(s_sampledata, 0, s_sampledata.Length, dest);
Assert.IsTrue(Enumerable.SequenceEqual(expected, dest.ToArray())); // length is known
}
}