/// <summary>
/// Uses file names to direct input and output
/// </summary>
/// <param name="outputFileName">user input file, empty if from console</param>
/// <param name="inputFileName">user output file</param>
public LZW(string inputFileName, string outputFileName)
{
//Console.WriteLine("LZW with InFile={0} and OutFile={1}", inputFileName, outputFileName);
input = new BinaryInput(inputFileName);
output = new BinaryOutput(outputFileName);
}