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using System;

using System.IO;

namespace ArithmeticCoding

{

class BitReader : IDisposable

{

private readonly Stream m_stream;

private byte m_bits;

private int m_bitsRead = 8;

public BitReader(Stream stream)

{

m_stream = stream;

}

public BitReader(string fileName)

{

m_stream = new FileStream(fileName, FileMode.Open);

}

public bool ReadBit()

{

if (m_bitsRead == 8)

{

int read = m_stream.ReadByte();

if (read == -1)

return false;

m_bits = (byte)read;

m_bitsRead = 0;

}

bool result = (m_bits & 1 << (7 - m_bitsRead)) != 0;

m_bitsRead++;

return result;

}

public ulong ReadUInt64()

{

return Elias.GammaDecode(this);

}

public void Dispose()

{

m_stream.Dispose();

}

}

}