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_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_CanWrite()
{
// Verify behavior of a decompression stream
using (LzmaReader stream = new LzmaReader(new MemoryStream(s_sampledata)))
{
Assert.IsFalse(stream.CanWrite);
}
}
public void Lzma_SetLength()
{
// Verify behavior of a decompression stream
using (LzmaReader stream = new LzmaReader(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 Lzma_Flush()
{
// Verify behavior of flushing a decompression stream
using (LzmaReader stream = new LzmaReader(new MemoryStream(s_sampledata)))
{
// Flush has no effect on decompression streams, just ensure it doesn't throw
stream.Flush();
}
}
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_DecompressExternal()
{
// Decompress a stream created externally to this library
using (LzmaReader reader = new LzmaReader(Assembly.GetExecutingAssembly().GetManifestResourceStream("zuki.io.compression.test.thethreemusketeers.lzma")))
{
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 Lzma_Seek()
{
// Verify behavior of a decompression stream
using (LzmaReader stream = new LzmaReader(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 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_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);
}
}
}
