/// <summary>
/// Parses the encodings from the raw encoding string into a Hash Table/Dict
/// </summary>
public void BuildEncodingDictionary()
{
string rawEncTable = GetRawEncodingTable();
string pattern = @"(\d{1,3})([_])([0-1]*)([_]{2})?";
Match match = Regex.Match(rawEncTable, pattern);
while (match.Success)
{
byte ch = (byte)Convert.ToInt32(match.Groups[1].Value);
EncodingDict.Add(match.Groups[3].Value, ch);
match = match.NextMatch();
}
}
public void DecompressFile()
{
StringBuilder writePath = new StringBuilder();
writePath.Append(Directory.GetCurrentDirectory());
writePath.Append(@"\" + FileWrite + ".txt");
StringBuilder readPath = new StringBuilder();
readPath.Append(Directory.GetCurrentDirectory());
readPath.Append(@"\" + FileRead);
FileInfo file = new FileInfo(readPath.ToString());
Console.WriteLine("File is decompressing");
using (StreamWriter writer = new StreamWriter(writePath.ToString()))
{
using (BinaryReader reader = new BinaryReader(File.Open(readPath.ToString(), FileMode.Open)))
{
reader.BaseStream.Seek(ByteOffset, SeekOrigin.Begin);
bool found = false;
int exponent = 0;
StringBuilder encoding = new StringBuilder();
byte rByte = reader.ReadByte();
while (reader.BaseStream.Position != (reader.BaseStream.Length + ByteOffset))
{
while (!found)
{
//byte bitLoc = (byte)Math.Pow(2, exponent);
if (IsBitOn(rByte, exponent))
{
encoding.Append("1");
}
else
{
encoding.Append("0");
}
byte val;
if (EncodingDict.TryGetValue(encoding.ToString(), out val))
{
writer.Write((char)val);
encoding.Clear();
exponent++;
found = true;
}
else
{
exponent++;
}
if (exponent > 7)
{
if (reader.BaseStream.Position < reader.BaseStream.Length)
{
rByte = reader.ReadByte();
exponent = 0;
}
else
{
Console.WriteLine("File is done Compressing");
Console.ReadKey();
Environment.Exit(0);
}
}
}
found = false;
}
}
}
}
