public void VerifyCompression_LargeCorpus()
{
var stream = new MemoryStream();
var writer = new BitStreamWriter(stream, true);
var reader = new BitStreamReader(stream, true);
string input = TestResources.RFC5_Text;
var state = new TreeStateStore();
var compressor = new StaticHuffman<char>(CharacterFrequencies(input));
compressor.WriteTable(state.WriteSymbol, state.WriteUInt32);
foreach (char ch in input)
{
compressor.WriteCode(ch, writer.Write);
}
writer.Flush();
state.Reset();
var decompressor = new StaticHuffman<char>(state.ReadSymbol, state.ReadUInt32);
stream.Position = 0;
foreach (char ch in input)
{
Assert.AreEqual(ch, decompressor.GetSymbol(reader.ReadBoolean));
}
}
public void VerifyCompression_astrachan_()
{
var stream = new MemoryStream();
string input = "astrachan_";
var compressor = new StaticHuffman<char>(CharacterFrequencies(input));
// Node ids: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14
// Weights: 1 1 1 1 1 1 1 3 2 2 2 3 4 6 10
var state = new TreeState(8, '_', 'c', 'h', 'n', 'r', 's', 't', 'a', 0, 1, 2, 3, 4, 5, 6, 8, 9, 10, 7, 11,
12, 13);
compressor.WriteTable(state.WriteSymbol, state.WriteUInt32);
state.Final();
var writer = new BitStreamWriter(stream, true);
foreach (char ch in input)
{
compressor.WriteCode(ch, writer.Write);
}
writer.Flush();
state.Reset();
var decompressor = new StaticHuffman<char>(state.ReadSymbol, state.ReadUInt32);
state.Final();
state.Reset();
decompressor.WriteTable(state.WriteSymbol, state.WriteUInt32);
state.Final();
stream.Position = 0;
var reader = new BitStreamReader(stream, true);
foreach (char ch in input)
{
Assert.AreEqual(ch, decompressor.GetSymbol(reader.ReadBoolean));
}
}
public void BaseStream_IsBitStream()
{
var data = new byte[] {0x23, 0x72, 0x64, 0xe3, 0x11, 0xd1, 0x4a, 0x9c, 0xb6, 0x02};
var stream = new MemoryStream(data);
BitStream bitStream = new BitStreamWriter(stream);
var writer = new BitBinaryWriter(bitStream);
Assert.AreSame(bitStream, writer.BaseStream);
}
public void leaveOpen_True()
{
var stream = new MemoryStream();
using (var writer = new BitStreamWriter(stream, true))
{
Assert.AreEqual(false, writer.CanRead);
Assert.AreEqual(true, writer.CanWrite);
Assert.AreEqual(true, writer.CanSeek);
Assert.AreEqual(0, writer.Length);
Assert.AreEqual(0, writer.BitLength);
Assert.AreEqual(0, writer.BitPosition);
Assert.AreEqual(0, writer.Position);
writer.Write(true);
Assert.AreEqual(1, writer.Length);
Assert.AreEqual(1, writer.BitLength);
Assert.AreEqual(1, writer.BitPosition);
Assert.AreEqual(0, writer.Position);
writer.Seek(0, SeekOrigin.Begin);
Assert.AreEqual(1, stream.Length);
Assert.AreEqual(0, stream.Position);
Assert.AreEqual(0x80, stream.GetBuffer()[0]);
writer.Write(false);
}
Assert.AreEqual(1, stream.Length);
Assert.AreEqual(1, stream.Position);
Assert.AreEqual(0, stream.GetBuffer()[0]);
using (var writer = new BitStreamWriter(stream, false))
{
var data = new byte[] {0x3c, 0x4b, 0x1a, 0x54, 0x22, 0x10, 0xaf, 0x89, 0x97, 0x65};
writer.Write(data, 0, data.Length);
writer.Flush();
Assert.AreEqual(11, stream.Length);
Assert.AreEqual(11, stream.Position);
}
}
public void WriteByte()
{
var stream = new MemoryStream();
using (var writer = new BitStreamWriter(stream, true))
{
Assert.AreEqual(false, writer.CanRead);
Assert.AreEqual(true, writer.CanWrite);
Assert.AreEqual(true, writer.CanSeek);
Assert.AreEqual(0, writer.Length);
Assert.AreEqual(0, writer.BitLength);
Assert.AreEqual(0, writer.BitPosition);
Assert.AreEqual(0, writer.Position);
writer.WriteByte(0x3c);
Assert.AreEqual(1, writer.Length);
Assert.AreEqual(8, writer.BitLength);
Assert.AreEqual(8, writer.BitPosition);
Assert.AreEqual(1, writer.Position);
}
Assert.AreEqual(1, stream.Length);
Assert.AreEqual(1, stream.Position);
Assert.AreEqual(0x3c, stream.GetBuffer()[0]);
}
public void WriteSevenBits()
{
int bitCount = 7;
var stream = new MemoryStream();
using (var writer = new BitStreamWriter(stream, true))
{
Assert.AreEqual(false, writer.CanRead);
Assert.AreEqual(true, writer.CanWrite);
Assert.AreEqual(true, writer.CanSeek);
Assert.AreEqual(0, writer.Length);
Assert.AreEqual(0, writer.BitLength);
Assert.AreEqual(0, writer.BitPosition);
Assert.AreEqual(0, writer.Position);
for (int i = 0; i < bitCount; ++i)
{
writer.Write(true);
}
Assert.AreEqual((bitCount + 7) >> 3, writer.Length);
Assert.AreEqual(bitCount, writer.BitLength);
Assert.AreEqual(bitCount, writer.BitPosition);
Assert.AreEqual(bitCount >> 3, writer.Position);
}
}
public void WriteBit_Seek_WriteBit()
{
var stream = new MemoryStream();
using (var writer = new BitStreamWriter(stream, true))
{
Assert.AreEqual(false, writer.CanRead);
Assert.AreEqual(true, writer.CanWrite);
Assert.AreEqual(true, writer.CanSeek);
Assert.AreEqual(0, writer.Length);
Assert.AreEqual(0, writer.BitLength);
Assert.AreEqual(0, writer.BitPosition);
Assert.AreEqual(0, writer.Position);
writer.Write(true);
Assert.AreEqual(1, writer.Length);
Assert.AreEqual(1, writer.BitLength);
Assert.AreEqual(1, writer.BitPosition);
Assert.AreEqual(0, writer.Position);
writer.Seek(0, SeekOrigin.Begin);
Assert.AreEqual(1, stream.Length);
Assert.AreEqual(0, stream.Position);
Assert.AreEqual(0x80, stream.GetBuffer()[0]);
writer.Write(false);
}
Assert.AreEqual(1, stream.Length);
Assert.AreEqual(1, stream.Position);
Assert.AreEqual(0, stream.GetBuffer()[0]);
}
public void WriteArray()
{
var data = new byte[] {0x3c, 0x4b, 0x1a, 0x54, 0x22, 0x10, 0xaf, 0x89, 0x97, 0x65};
var expected = new byte[] {0x9e, 0x25, 0x8d, 0x2a, 0x11, 0x08, 0x57, 0xc4, 0xcb, 0xb2, 0x80};
var result = new byte[expected.Length];
var stream = new MemoryStream();
using (var writer = new BitStreamWriter(stream, true))
{
Assert.AreEqual(false, writer.CanRead);
Assert.AreEqual(true, writer.CanWrite);
Assert.AreEqual(true, writer.CanSeek);
Assert.AreEqual(0, writer.Length);
Assert.AreEqual(0, writer.BitLength);
Assert.AreEqual(0, writer.BitPosition);
Assert.AreEqual(0, writer.Position);
writer.Write(true);
writer.Write(data, 0, data.Length);
Assert.AreEqual(11, writer.Length);
Assert.AreEqual(81, writer.BitLength);
Assert.AreEqual(81, writer.BitPosition);
Assert.AreEqual(10, writer.Position);
}
Array.Copy(stream.GetBuffer(), 0, result, 0, expected.Length);
CollectionAssert.AreEqual(expected, result);
}
public void SetLength_SetPosition()
{
var stream = new MemoryStream();
using (var writer = new BitStreamWriter(stream, true))
{
Assert.AreEqual(false, writer.CanRead);
Assert.AreEqual(true, writer.CanWrite);
Assert.AreEqual(true, writer.CanSeek);
Assert.AreEqual(0, writer.Length);
Assert.AreEqual(0, writer.BitLength);
Assert.AreEqual(0, writer.BitPosition);
Assert.AreEqual(0, writer.Position);
writer.SetLength(10);
writer.Write(true);
writer.Position = 5;
writer.Write(true);
Assert.AreEqual(10, writer.Length);
Assert.AreEqual(80, writer.BitLength);
Assert.AreEqual(41, writer.BitPosition);
Assert.AreEqual(5, writer.Position);
}
Assert.AreEqual(10, stream.Length);
Assert.AreEqual(6, stream.Position);
Assert.AreEqual(0x80, stream.GetBuffer()[0]);
Assert.AreEqual(0x80, stream.GetBuffer()[5]);
}
public void ReadByte_NotSupported()
{
var data = new byte[] {0x3c, 0x4b, 0x1a, 0x54, 0x22, 0x10, 0xaf, 0x89, 0x97, 0x65};
var stream = new MemoryStream(data);
using (var writer = new BitStreamWriter(stream, false))
{
writer.ReadByte();
}
}
public void ReadArray_NotSupported()
{
var data = new byte[] {0x3c, 0x4b, 0x1a, 0x54, 0x22, 0x10, 0xaf, 0x89, 0x97, 0x65};
var stream = new MemoryStream(data);
using (var writer = new BitStreamWriter(stream, false))
{
var result = new byte[10];
writer.Read(result, 0, result.Length);
}
}