public static void Encode(string arquivo)
{
LZWEncoder encoder = new LZWEncoder();
string conteudo = Arquivo.Abrir(arquivo);
Console.WriteLine("Iniciada a compressão");
DateTime dataInicial = DateTime.Now;
//Codificação LZW
string lzwEncoded = encoder.Encode(conteudo);
HuffmanTree huffman = new HuffmanTree();
//Criação da árvore huffman
huffman.Build(lzwEncoded);
//Codificação huffman
var huffmanEncoded = huffman.Encode(lzwEncoded);
DateTime dataFinal = DateTime.Now;
string tempoDecorrido = (dataFinal - dataInicial).TotalSeconds.ToString("N2");
//Contabiliza apenas os tempos para compressão. Igora tempo de IO
Console.WriteLine($"Arquivo comprimido em {tempoDecorrido} segundos");
byte[] ret = new byte[(huffmanEncoded.Length - 1) / 8 + 1];
huffmanEncoded.CopyTo(ret, 0);
//Gravando arquivo comprimido
Arquivo.Gravar(ret, $"{arquivo.Split('.')[0]}.scps");
}
/**
* Encodes and writes pixel data
*/
protected void WritePixels()
{
LZWEncoder encoder =
new LZWEncoder(width, height, indexedPixels, colorDepth);
encoder.Encode(fs);
}
/// <summary>
/// Writes to the specified writer.
/// </summary>
/// <param name="writer">The writer.</param>
/// <returns>
/// True if it writes successfully, false otherwise
/// </returns>
public override bool Write(EndianBinaryWriter writer)
{
var encoder = new LZWEncoder(Indices, BitDepth);
encoder.Encode(writer.BaseStream);
return(true);
}
static void Main(string[] args)
{
Console.WriteLine("Generate ANSI table ...");
ANSI ascii = new ANSI();
ascii.WriteToFile();
Console.WriteLine("ANSI table generated.");
Console.WriteLine("Start encoding " + fileToCompress + " ...");
string text = File.ReadAllText(fileToCompress, System.Text.ASCIIEncoding.Default);
LZWEncoder encoder = new LZWEncoder();
byte[] b = encoder.EncodeToByteList(text);
File.WriteAllBytes(encodedFile, b);
Console.WriteLine("File " + fileToCompress + " encoded to " + encodedFile);
Console.WriteLine("Start decoding " + encodedFile);
LZWDecoder decoder = new LZWDecoder();
byte[] bo = File.ReadAllBytes(encodedFile);
string decodedOutput = decoder.DecodeFromCodes(bo);
File.WriteAllText(decodedFile, decodedOutput, System.Text.Encoding.Default);
Console.WriteLine("File " + encodedFile + " decoded to " + decodedFile);
}
public static int compress(byte[] origData, int offset, int length, BinaryWriter writer, CompressionMethod compId, CompressionLevel compressLevel)
{
if (compressLevel == CompressionLevel.NoCompression)
{
writer.Write(origData);
return(origData.Length);
}
switch (compId)
{
case CompressionMethod.UNCOMPRESSED:
writer.Write(origData);
return(origData.Length);
case CompressionMethod.LZW:
var lzwEncoder = new LZWEncoder();
byte[] compressed = lzwEncoder.Encode(origData, offset, length);
writer.Write(compressed);
return(compressed.Length);
case CompressionMethod.DEFLATE:
case CompressionMethod.ADOBE_DEFLATE:
writer.Write(deflateHeader(compressLevel));
compressed = deflateCompress(origData, offset, length, compressLevel);
writer.Write(compressed);
var crcChecker = new Adler32();
writer.Write(crcChecker.SwitchByteOrder(crcChecker.ComputeChecksum(origData, offset, length)));
return(compressed.Length + 6);
default:
throw new ReadFileException("Unsupported comnpression");
}
}
private void WriteImage()
{
var encoder = new LZWEncoder(IndexPixels(ColorTable), ColorTableSize); //ColorTableSize+1
encoder.Encode(InternalStream);
//var encoder = new FileWriters.GifWriter.LzwEncoder(0, 0, IndexPixels(ColorTable), 8); //+1
//encoder.Encode(InternalStream);
}
public static void encode(string filename)
{
var fileContent = FileWrapper.open(filename);
var encoder = new LZWEncoder();
var lzwEncoded = encoder.Encode(fileContent);
var deltaEncoded = Delta.encode(lzwEncoded);
FileWrapper.writeInBytes(deltaEncoded, getEncodedFilename(filename));
}
public EncodedFile Run(SourceFile source)
{
var lzwEncoder = new LZWEncoder();
var huffmanEncoder = new HuffmanEncoder();
var outlzw = lzwEncoder.Encode(source.Content);
var outHuffman = huffmanEncoder.Encode(outlzw);
var header = new FileHeader(Pipeline, huffmanEncoder.HuffmanMetadata, source.Extension);
var encodedFile = new EncodedFile(header, outHuffman);
return(encodedFile);
}
private void btnPack_Click(object sender, EventArgs e)
{
OpenFileDialog opf = new OpenFileDialog();
if (opf.ShowDialog() == System.Windows.Forms.DialogResult.OK)
{
txtPath.Text = opf.FileName;
var text = File.ReadAllText(opf.FileName, System.Text.ASCIIEncoding.Default);
LZWEncoder encoder = new LZWEncoder();
var buffer = encoder.EncodeToByteList(text);
File.WriteAllBytes(opf.FileName + ".lzw", buffer);
MessageBox.Show("Encoding complete.");
}
}
private void Compress(object sender, RoutedEventArgs e)
{
if (!filenameCom.fileIsEmpty())
{
string noteCompressed = @"D:\RealEncAndCom\noteCompressed.txt";
File.Delete(noteCompressed);
ANSI ascii = new ANSI();
LZWEncoder encoder = new LZWEncoder();
string text = File.ReadAllText(filenameCom, System.Text.Encoding.Default);
ascii.WriteToFile();
byte[] b = encoder.EncodeToByteList(text);
File.WriteAllBytes(noteCompressed, b);
comLabel1.Content = "Файл был сжат!";
}
else
{
comLabel1.Content = "Файл не был сжат!";
}
}
public static void Do()
{
Console.WriteLine("Generate ANSI table ...");
var ascii = new Ansi();
ascii.WriteToFile();
Console.WriteLine("ANSI table generated.");
Console.WriteLine("Start encoding " + _fileToCompress + " ...");
var text = File.ReadAllText(_fileToCompress);
var encoder = new LZWEncoder();
var b = encoder.EncodeToByteList(text);
File.WriteAllBytes(_encodedFile, b);
Console.WriteLine("File " + _fileToCompress + " encoded to " + _encodedFile);
Console.WriteLine("Start decoding " + _encodedFile);
var decoder = new LZWDecoder();
var bo = File.ReadAllBytes(_encodedFile);
var decodedOutput = decoder.DecodeFromCodes(bo);
File.WriteAllText(_decodedFile, decodedOutput, Encoding.Default);
Console.WriteLine("File " + _encodedFile + " decoded to " + _decodedFile);
}
static void SetFrames(List<GifFrame> frames,StreamHelper streamHelper,Stream fs)
{
foreach (GifFrame f in frames)
{
List<byte> list = new List<byte>();
if (f.GraphicExtension != null)
{
list.AddRange(f.GraphicExtension.GetBuffer());
}
f.ImageDescriptor.SortFlag = false;
f.ImageDescriptor.InterlaceFlag = false;
list.AddRange(f.ImageDescriptor.GetBuffer());
if (f.ImageDescriptor.LctFlag)
{
list.AddRange(f.LocalColorTable);
}
streamHelper.WriteBytes(list.ToArray());
int transIndex = -1;
if (f.GraphicExtension.TransparencyFlag)
{
transIndex = f.GraphicExtension.TranIndex;
}
byte[] indexedPixel = GetImagePixels(f.Image, f.LocalColorTable, transIndex);
LZWEncoder lzw = new LZWEncoder(indexedPixel, (byte)f.ColorDepth);
lzw.Encode(fs);
streamHelper.WriteBytes(new byte[] { 0 });
}
streamHelper.WriteBytes(new byte[] { 0x3B });
}
public Frame(byte[] Pixels, int Width, int Height, uint[] Palette, uint ColorCount, LZWEncoder Encoder, ushort Delay, int TransparentColorIndex = -1)
{
if (Pixels == null)
{
throw new ArgumentException("Pixels can't be null.");
}
if (Width <= 0 || Height <= 0)
{
throw new ArgumentException("Width and Height must be greater 0.");
}
if (Palette == null || Palette.Length > 256)
{
throw new ArgumentException("Palette null or more than 256 entries.");
}
if (ColorCount > Palette.Length)
{
throw new ArgumentException("ColorCount bigger than Palette size.");
}
if (Encoder == null)
{
throw new ArgumentException("Encoder can't be null.");
}
// save provided dimension
this.Width = (ushort)Width;
this.Height = (ushort)Height;
// encode pixels using argument encoder instance
Encoder.Encode(Pixels, Chunks, Width, Height);
MinLZWCodeSize = 8;
// determine size of colortable to use
// get next bigger power of 2 value of used colorcount
uint palSize2 = NextPowerOf2(ColorCount);
// use and create local color table with determined size
Packed.IsLocalColorTable = true;
Packed.SizeOfLocalColorTable = (uint)Math.Max((int)Math.Log(palSize2, 2.0) - 1, 0);
ColorTable = new byte[palSize2 * 3];
// fill color table
int i = 0;
for (uint j = 0; j < ColorCount; j++)
{
uint c = Palette[j];
ColorTable[i] = (byte)((c & 0x00FF0000) >> 16); i++;
ColorTable[i] = (byte)((c & 0x0000FF00) >> 8); i++;
ColorTable[i] = (byte)(c & 0x000000FF); i++;
}
// set graphics control extension
GraphicsControl = new ExtensionGraphicsControl();
GraphicsControl.DelayTime = Delay;
GraphicsControl.Packed.IsUserInput = false;
GraphicsControl.Packed.DisposalMethod =
ExtensionGraphicsControl.Flags.DisposalMethods.RestoreToBackground;
// possibly set transparent color index and enable transparency
if (TransparentColorIndex > -1 && TransparentColorIndex < 256)
{
GraphicsControl.Packed.IsTransparentColor = true;
GraphicsControl.TransparentColorIndex = (byte)TransparentColorIndex;
}
}
