using System;
using System.IO;

/* 
 * Reference arithmetic coding
 * Copyright (c) Project Nayuki
 * 
 * https://www.nayuki.io/page/reference-arithmetic-coding
 * https://github.com/nayuki/Reference-arithmetic-coding
 */



/// <summary>
/// Decompression application using adaptive arithmetic coding.
/// <para>Usage: java AdaptiveArithmeticDecompress InputFile OutputFile</para>
/// <para>This decompresses files generated by the "AdaptiveArithmeticCompress" application.</para>
/// </summary>
public class AdaptiveArithmeticDecompress
{

//JAVA TO C# CONVERTER WARNING: Method 'throws' clauses are not available in C#:
//ORIGINAL LINE: public static void main(String[] args) throws java.io.IOException
	public static void Main(string[] args)
	{
		/* @@@@ PORT
		// Handle command line arguments
		if (args.Length != 2)
		{
			Console.Error.WriteLine("Usage: java AdaptiveArithmeticDecompress InputFile OutputFile");
			Environment.Exit(1);
			return;
		}
		File inputFile = new File(args[0]);
		File outputFile = new File(args[1]);

		// Perform file decompression
		using (BitInputStream @in = new BitInputStream(new BufferedInputStream(new FileStream(inputFile, FileMode.Open, FileAccess.Read))), Stream @out = new BufferedOutputStream(new FileStream(outputFile, FileMode.Create, FileAccess.Write)))
		{
			decompress(@in, @out);
		}
		*/
	}


	// To allow unit testing, this method is package-private instead of private.
//JAVA TO C# CONVERTER WARNING: Method 'throws' clauses are not available in C#:
//ORIGINAL LINE: static void decompress(BitInputStream in, java.io.OutputStream out) throws java.io.IOException
	internal static void decompress(BitInputStream @in, Stream @out)
	{
		FlatFrequencyTable initFreqs = new FlatFrequencyTable(257);
		FrequencyTable freqs = new SimpleFrequencyTable(initFreqs);
		ArithmeticDecoder dec = new ArithmeticDecoder(32, @in);
		while (true)
		{
			// Decode and write one byte
			int symbol = dec.read(freqs);
			if (symbol == 256) // EOF symbol
			{
				break;
			}
			@out.WriteByte((byte)symbol);
			freqs.increment(symbol);
		}
	}

}