C # Implementation of LZW algorithm

Algorithm

#undef Debug
#define Debugdisplay
#undef debugdictionary
Using System;
Using System.Collections;

Namespace LZW
{
public class CLZW
{
#region Constrcut
Public CLZW ()
{
}
#endregion

#region Coding
public string Incharstream
{
set {_incharstream = value;}
get {return _incharstream;}
}
Public ArrayList Codingcodestream
{
get {return _codingcodestream;}
}
Public ArrayList Codingdictionary
{
get {return _codingdictionary;}
}
private void Initcodingdictionary ()
{
_codingdictionary.clear ();
#if Debug
_codingdictionary.add ("A");
_codingdictionary.add ("B");
_codingdictionary.add ("C");
#else
for (int i = 0; i < 256; i++)
{
_codingdictionary.add ((char) i);
}
#endif
}
private void Addcodingdictionary (Object str)
{
_codingdictionary.add (str);
}
private void Addcodingcodestream (Object str)
{
_codingcodestream.add (str);
}
private bool Isincodingdictionary (string Prefix)
{
BOOL result = FALSE;
int count = _codingdictionary.count;
for (int i = 0; i < count; i++)
{
String temp = _codingdictionary[i]. ToString ();
if (temp. IndexOf (Prefix) >= 0)
{
result = true;
Break
}
}
return result;
}
private string Getindexcodingdictionary (String Prefix)
{
string result = "0";
int count = _codingdictionary.count;
for (int i = 0; i < count; i++)
{
String temp = _codingdictionary[i]. ToString ();
if (temp. IndexOf (Prefix) >= 0)
{
result = convert.tostring (i + 1);
Break
}
}
return result;
}
private void Displaycodingcodestream ()
{
System.Console.WriteLine ("*********_codingcodestream************");
for (int i = 0; i < _codingcodestream.count; i++)
{
System.Console.WriteLine (_codingcodestream[i]. ToString ());
}
}
private void Displaycodingdictionary ()
{
System.Console.WriteLine ("*********_codingdictionary************");
for (int i = 0; i < _codingdictionary.count; i++)
{
System.Console.WriteLine (_codingdictionary[i]. ToString ());
}
}
private void Displayincharstream ()
{
System.Console.WriteLine ("*********_incharstream************");
System.Console.WriteLine (_incharstream);
}
private void Initcodingcodestream ()
{
_codingcodestream.clear ();
}
Private ArrayList _codingdictionary = new ArrayList ();
private string _incharstream = "";
Private ArrayList _codingcodestream = new ArrayList ();
public void Coding ()
{
String Prefix = "";
String c = "";
String prefixindex= "0";
int count = _incharstream.length;
if (count = 0) return;
Initcodingdictionary ();
Initcodingcodestream ();
Prefix = _incharstream[0]. ToString ();
for (int i = 1; i < count; i++)
{
c = _incharstream[i]. ToString ();
if (Isincodingdictionary (Prefix + c))
{
Prefix + = C;
}
Else
{
Prefixindex = Getindexcodingdictionary (Prefix);
Addcodingcodestream (Prefixindex);
Addcodingdictionary (Prefix + c);
Prefix = C;
}
}
Prefixindex = Getindexcodingdictionary (Prefix);
Addcodingcodestream (Prefixindex);
#if Debugdisplay
Displayincharstream ();
Displaycodingcodestream ();
#if debugdictionary
Displaycodingdictionary ();
#endif
#endif
}

#endregion

#region Decode
Private ArrayList _decodedictionary = new ArrayList ();
Private ArrayList _outcharstream = new ArrayList ();
Private int[] _decodecodestream;
public void Setdecodescodetream (int[] obj)
{
int count = obj. Length;
_decodecodestream = new Int[count];
for (int i =0; i < count; i++)
{
_decodecodestream[i] = Obj[i];
}
}
public void Setdecodescodetream (ArrayList obj)
{
int count = obj. Count;
_decodecodestream = new Int[count];
for (int i =0; i < count; i++)
{
_decodecodestream[i] = System.Convert.ToInt32 (Obj[i]);
}

}
Public int[] Getdecodecodestream ()
{
return _decodecodestream;
}
public string Outcharstream
{
Get
{
string result = "";
for (int i = 0,count = _outcharstream.count i < count; i++)
{
result = _outcharstream[i]. ToString ();
}
return result;
}
}
Public ArrayList Decodedictionary
{
Get
{
return _decodedictionary;
}
}
private void Initdecodedictionary ()
{
_decodedictionary.clear ();
#if Debug
_decodedictionary.add ("A");
_decodedictionary.add ("B");
_decodedictionary.add ("C");
#else
for (int i = 0; i < 256; i++)
{
_decodedictionary.add ((char) i);
}
#endif
}
private void Initoutcharstream ()
{
_outcharstream.clear ();
}
private void Displayoutcharstream ()
{
System.Console.WriteLine ("*********_outcharstream************");
String temp = "";
for (int i = 0; i < _outcharstream.count; i++)
{
Temp = temp + (_outcharstream[i]. ToString ());
}

System.Console.WriteLine (temp);
}
private void Displaydecodedictionary ()
{
System.Console.WriteLine ("*********_decodedictionary************");
for (int i = 0; i < _decodedictionary.count; i++)
{
System.Console.WriteLine (_decodedictionary[i]. ToString ());
}

}
private void Displaydecodecodestream ()
{
System.Console.WriteLine ("*********_decodecodestream************");
int count = _decodecodestream.length;
for (int i = 0; i < count; i++)
{
System.Console.WriteLine ("{0}", _decodecodestream[i]);
}
}
private void Addoutcharstream (Object str)
{
_outcharstream.add (str);
}
private void Adddecodedictionary (Object str)
{
_decodedictionary.add (str);
}
private bool Isindecodedictionary (int cw)
{
BOOL result = FALSE;
int count = _decodedictionary.count;
if (CW <= count-1)
{
result = true;
}
return result;
}
public void Decode ()
{
Initdecodedictionary ();
Initoutcharstream ();
int cw = 0;
int pw = 0;
String Prefix = "";
String C= "";
CW = _decodecodestream[0]-1;
This. Addoutcharstream (THIS._DECODEDICTIONARY[CW]);
PW = CW;
int count = _decodecodestream.length;
if (count = 0) return;
for (int i = 1; i < count; i++)
{
CW = _decodecodestream[i]-1;
if (Isindecodedictionary (CW))
{
This. Addoutcharstream (THIS._DECODEDICTIONARY[CW]);
Prefix = THIS._DECODEDICTIONARY[PW]. ToString ();
c = (THIS._DECODEDICTIONARY[CW]. ToString ()) [0]. ToString ();
This. Adddecodedictionary (Prefix + c);
}
Else
{
Prefix = THIS._DECODEDICTIONARY[PW]. ToString ();
c = prefix[0]. ToString ();
This. Addoutcharstream (Prefix + c);
This. Adddecodedictionary (Prefix + c);
}
PW = CW;
}
#if Debugdisplay
Displayoutcharstream ();
Displaydecodecodestream ();
#if debugdictionary
Displaydecodedictionary ();
#endif
#endif
}
#endregion
}
}

#undef Debug
Using System;

Namespace LZW
{
Class Class1
{
[STAThread]
static void Main (string[] args)
{
CLZW LZW = new CLZW ();
#if Debug
Lzw. Incharstream = "ABBABABACCBBAAA";
#else
System.Console.WriteLine ("Enter the Tests Chararray [a-za-z0-9]:");
Lzw. Incharstream = System.Console.ReadLine ();
#endif
System.Console.WriteLine ("The coding ...");
Lzw. Coding ();
System.Console.WriteLine ("The DeCode ...");
Lzw. Setdecodescodetream (LZW. Codingcodestream);
Lzw. Decode ();
System.Console.ReadLine ();
}
}
}