public void EncodeTest()
{
MockEncoder encoder = new MockEncoder();
LZW lzw = new LZW(encoder);
lzw.Encode((42));
lzw.Encode((43));
lzw.Encode((42));
lzw.Encode((43));
lzw.Encode((44));
Assert.AreEqual(encoder.values[0], 42);
Assert.AreEqual(encoder.values[1], 43);
Assert.AreEqual(encoder.values[2], 256);
}
private void encodeResult(object sender, RoutedEventArgs e)
{
text = messageTextBox.Text.ToCharArray(0, messageTextBox.Text.Length);
dictionary = LZW.InitializeDictionary(text);
alphabet = new Dictionary <string, int>(dictionary);
encodeList = LZW.Encode(dictionary, text);
result.Text = String.Join(", ", encodeList);
CreateDictionary(dictionary);
}
public void EncodeDecodeTest()
{
MockEncoder encoder = new MockEncoder();
LZW lzw = new LZW(encoder);
foreach (byte character in "Lorem ipsum dolor sit amet consectetur adepiscig nullam")
{
lzw.Encode(character);
}
lzw.EncoderFinalize();
LZW lzwDecoder = new LZW(encoder);
String output = "";
foreach (byte character in "Lorem ipsum dolor sit amet consectetur adepiscig nullam")
{
byte actual = lzwDecoder.Decode();
output += (char)actual;
Assert.AreEqual(character, actual);
}
}
public byte[] GetBytes()
{
using (MemoryStream ms = new MemoryStream())
using (BinaryWriter br = new BinaryWriter(ms))
{
if (HasPalette16)
{
br.Write((ushort)0x3045);
throw new NotImplementedException();
}
if (HasPalette256)
{
br.Write((ushort)0x304D);
br.Write(GetColourPaletteBytes().ToArray());
}
if (HasPicture256)
{
br.Write((ushort)0x3058);
byte[] encoded = RLE.Encode(_picture256.ToByteArray());
encoded = LZW.Encode(encoded);
br.Write((ushort)(encoded.Length + 5));
br.Write((ushort)_picture256.Width);
br.Write((ushort)_picture256.Height);
br.Write((byte)11);
br.Write(encoded);
}
if (HasPalette16)
{
br.Write((ushort)0x3158);
throw new NotImplementedException();
}
return(ms.ToArray());
}
}
public byte[] GetBytes()
{
using (MemoryStream output = new MemoryStream())
using (BinaryWriter writer = new BinaryWriter(output))
{
// GIF header
writer.Write("GIF89a".ToCharArray());
// Width x Height
writer.Write((ushort)_pixels.Width);
writer.Write((ushort)_pixels.Height);
// GCT Descriptor
writer.Write((byte)0xF7);
// Background colour #0
writer.Write((byte)0x00);
//Default pixel aspect ratio
writer.Write((byte)0x00);
// Write colour palette
for (int i = 0; i < 256; i++)
{
byte r = 0, g = 0, b = 0;
if (_palette.Length > i)
{
r = _palette[i].R;
g = _palette[i].G;
b = _palette[i].B;
}
writer.Write(new byte[] { r, g, b });
}
// Image Descriptor
writer.Write((byte)0x2C);
// NW Corner
writer.Write((ushort)0);
writer.Write((ushort)0);
// Width x Height
writer.Write((ushort)_pixels.Width);
writer.Write((ushort)_pixels.Height);
// No local colour table
writer.Write((byte)0x00);
byte[] encoded = LZW.Encode(_pixels.ToByteArray(), true, false, 12);
// Code length
writer.Write((byte)0x08);
foreach (byte[] byteBlock in ByteBlock(encoded))
{
writer.Write((byte)byteBlock.Length);
writer.Write(byteBlock);
}
writer.Write((byte)0x00);
// End of file
writer.Write((byte)0x3B);
return(output.ToArray());
}
}
