public void WriteAllBytes_SequenceMin3_Decoding()
{
var memoryStream = new MemoryStream();
var rleStreamWriter = new RleStreamWriter(3, memoryStream);
rleStreamWriter.WriteAllByte(new byte[] { 123, 34, 127, 127, 2, 12, 13, 13, 13, 13, 13, 13, 13, 13, 33 });
CollectionAssert.AreEqual(new byte[] { 123, 34, 127, 127, 2, 12, 13, 13, 13, 5, 33 }, memoryStream.ToArray());
}
public void Write_OneByte_LengthEqualOne()
{
var memoryStream = new MemoryStream();
var rleStreamWriter = new RleStreamWriter(2, memoryStream);
rleStreamWriter.WriteByte(127);
Assert.AreEqual(1, memoryStream.Length);
}
public void WriteAllBytes_TwoTheSameBytesAndSequance2AndOneOther()
{
var memoryStream = new MemoryStream();
var rleStreamWriter = new RleStreamWriter(2, memoryStream);
rleStreamWriter.WriteAllByte(new byte[] { 127, 127, 127, 127, 12 });
CollectionAssert.AreEqual(new byte[] { 127, 127, 2, 12 }, memoryStream.ToArray());
}
public void Write_TwoTheSameBytes_LengthEqualTwo()
{
var memoryStream = new MemoryStream();
var rleStreamWriter = new RleStreamWriter(2, memoryStream);
rleStreamWriter.WriteByte(127);
rleStreamWriter.WriteByte(127);
Assert.AreEqual(2, memoryStream.Length);
}
public void Write_OneByte()
{
var memoryStream = new MemoryStream();
var rleStreamWriter = new RleStreamWriter(2, memoryStream);
var b = (byte)127;
rleStreamWriter.WriteByte(b);
memoryStream.Position = 0;
Assert.AreEqual(b, memoryStream.ReadByte());
}
public void Write_TwoTheSameBytesAndOneOther_ThirdByteEqualOne()
{
var memoryStream = new MemoryStream();
var rleStreamWriter = new RleStreamWriter(2, memoryStream);
rleStreamWriter.WriteByte(127);
rleStreamWriter.WriteByte(127);
rleStreamWriter.WriteByte(100);
memoryStream.Position = 2;
Assert.AreEqual(0, memoryStream.ReadByte());
}
public void Flush_ThreeTheSameBytes_LengthEqualThree()
{
var memoryStream = new MemoryStream();
var rleStreamWriter = new RleStreamWriter(2, memoryStream);
rleStreamWriter.WriteByte(127);
rleStreamWriter.WriteByte(127);
rleStreamWriter.WriteByte(127);
rleStreamWriter.Flush();
Assert.AreEqual(3, memoryStream.Length);
}
public void Write_255TheSameBytesSequence_LengthEqualThree()
{
const int sequenceMin = 2;
var memoryStream = new MemoryStream();
var rleStreamWriter = new RleStreamWriter(sequenceMin, memoryStream);
for (int i = 0; i < 255 + sequenceMin; i++)
{
rleStreamWriter.WriteByte(127);
}
Assert.AreEqual(3, memoryStream.Length);
}
public void Write_TwoTheSameBytesAndOneOther_FourthByteEqualOne()
{
var memoryStream = new MemoryStream();
var rleStreamWriter = new RleStreamWriter(2, memoryStream);
var thirdByte = (byte)100;
rleStreamWriter.WriteByte(127);
rleStreamWriter.WriteByte(127);
rleStreamWriter.WriteByte(thirdByte);
memoryStream.Position = 3;
Assert.AreEqual(thirdByte, memoryStream.ReadByte());
}
public void Write_ThreeTheSameBytes_ThirdByteEqualOne()
{
var memoryStream = new MemoryStream();
var rleStreamWriter = new RleStreamWriter(2, memoryStream);
var b = (byte)127;
rleStreamWriter.WriteByte(b);
rleStreamWriter.WriteByte(b);
rleStreamWriter.WriteByte(b);
memoryStream.Position = 2;
Assert.AreEqual(-1, memoryStream.ReadByte());
}
public void Write_TwoTwoDifferentBytes()
{
var memoryStream = new MemoryStream();
var rleStreamWriter = new RleStreamWriter(2, memoryStream);
var b1 = (byte)127;
var b2 = (byte)100;
rleStreamWriter.WriteByte(b1);
rleStreamWriter.WriteByte(b2);
memoryStream.Position = 0;
Assert.AreEqual(b1, memoryStream.ReadByte());
Assert.AreEqual(b2, memoryStream.ReadByte());
}
[Test] public void Write_255TheSameBytesSequence_ThirdByteEqual255()
{
const int sequenceMin = 2;
var memoryStream = new MemoryStream();
var rleStreamWriter = new RleStreamWriter(sequenceMin, memoryStream);
for (int i = 0; i < 255 + sequenceMin; i++)
{
rleStreamWriter.WriteByte(127);
}
memoryStream.Position = 2;
Assert.AreEqual(255, memoryStream.ReadByte());
}
public void CompressFile(string fileFullPath)
{
var fileMode = File.Exists(FullPath(_filePath, _fileName)) ? FileMode.Append : FileMode.CreateNew;
long position = 0;
long lenght = 0;
using (var fileStreamReader = new FileStream(fileFullPath, FileMode.Open, FileAccess.Read))
using (var rleFileStreamWriter = new RleStreamWriter(_sequenceMin,
new FileStream(FullPath(_filePath, _fileName), fileMode, FileAccess.Write)))
{
int b;
while ((b = fileStreamReader.ReadByte()) >= 0)
{
position += rleFileStreamWriter.WriteByte((byte)b);
lenght++;
}
}
AddCompresionData(fileFullPath, position, lenght);
}