public void Start()
{
try
{
string textOutput = "\n Decoding: ";
Console.Write(textOutput);
this.progLocation = textOutput.Length;
// Read in bytes and convert to a string buffer
List <byte> encodedBytes = ReadBytesFromFile(this.incoming);
this.sizeOfCompressedFile = encodedBytes.Count();
// Extract decoding key and the encoded/compressed text and generate a frequency list
List <byte> decodingKey = GetKeyFromBytes(encodedBytes);
List <byte> encodedText = GetEncodedBytesFromFile(encodedBytes);
List <Tuple <string, int, HuffmanNode> > freqList = GetFrequencyList(decodingKey);
// Create huffman Tree and decoding table
HuffmanNode rootNode = ConstructHuffmanTree(freqList);
Dictionary <char, string> decodingDict = CreateNewBinaryDictionary(rootNode);
// Using the decoding table decode the text. Dump text into a List of bytes
string decodedText = DecodeBytes(decodingDict, encodedText);
List <byte> decodedBytes = new List <byte>();
decodedBytes.AddRange(Encoding.ASCII.GetBytes(decodedText));
this.sizeOfTextFile = decodedBytes.Count();
// Write decoded bytes to file
WriteBytesToFile(path + outgoing, "txt", decodedBytes);
DrawText(100, 100, progLocation);
Console.WriteLine("\n");
Console.WriteLine(" Decoding Complete! \n");
}
catch (Exception e)
{
Console.WriteLine("\n\n The following error occurred during decoding: {0}", e.Message);
System.Environment.Exit(1);
}
}
public void Start()
{
try
{
string textOutput = "\n Compressing: ";
Console.Write(textOutput);
this.progLocation = textOutput.Length;
// Read in bytes and convert to a string buffer
List <byte> byteList = ReadBytesFromFile(this.incoming);
this.sizeOfTextFile = byteList.Count;
string textBuffer = System.Text.Encoding.ASCII.GetString(byteList.ToArray());
// Generate frequency table and Huffman tree
List <Tuple <string, int, HuffmanNode> > freqList = GetFrequencyList(textBuffer);
HuffmanNode rootNode = ConstructHuffmanTree(freqList);
// Generate Encoded dictionary (key) for converting ASCII into a new binary format
Dictionary <char, string> encodedDict = CreateNewBinaryDictionary(rootNode);
// Using the Encoded dictionary to create the encoded text and encoded key
// **NOTE: The encoded key is used to decode the compressed file back into text
List <byte> encodedText = GenerateBinaryEncoding(encodedDict, textBuffer);
List <byte> encodedKey = CreateEncodingKey(freqList);
List <byte> encodedFile = BuildFullEndcodedList(encodedKey, encodedText);
this.sizeOfCompressedFile = encodedFile.Count;
// Write encoded bytes to file
WriteBytesToFile(path + outgoing, "huf", encodedFile);
DrawText(100, 100, progLocation);
Console.WriteLine("\n");
Console.WriteLine(" Compression Complete! \n");
}
catch (Exception e)
{
Console.WriteLine("\n\n The following error occurred during compression: {0}", e.Message);
System.Environment.Exit(1);
}
}
