using System;

namespace Dazoe
{
    class ByteBuffer
    {
        private byte[] _buf;
        private int _length;
        public ByteBuffer()
        {
            _buf = new byte[0];
            _length = 0;
        }
        public void Append(byte[] BytesToAppend)
        {
            Append(BytesToAppend, BytesToAppend.Length);
        }
        public void Append(byte[] BytesToAppend, int Length)
        {
            if (BytesToAppend.Length >= Length)
            {
                lock (_buf)
                {
                    byte[] tmp = new byte[_buf.Length + Length];
                    Array.Copy(_buf, tmp, _buf.Length);
                    Array.Copy(BytesToAppend, 0, tmp, _buf.Length, Length);
                    _buf = tmp;
                }
                _length += Length;
            }
        }
        public byte[] Get()
        {
            byte[] New;
            New = Get(_length);
            return New;
        }
        public byte[] Get(int Length)
        {
            byte[] New = new byte[Length];
            byte[] tmp = new byte[_length - Length];
            lock (_buf)
            {
                Array.Copy(_buf, New, Length);
                Array.Copy(_buf, Length, tmp, 0, _length - Length);
                _length -= Length;
                _buf = tmp;
            }
            return New;
        }
    }
}