/*
    Copyright (C) 2011-2015 de4dot@gmail.com

    This file is part of de4dot.

    de4dot is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    de4dot is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with de4dot.  If not, see <http://www.gnu.org/licenses/>.
*/

using System;
using System.IO;

namespace de4dot.code.deobfuscators {
	public class NullStream : Stream {
		long offset = 0;
		long length = 0;

		public override bool CanRead {
			get { return false; }
		}

		public override bool CanSeek {
			get { return true; }
		}

		public override bool CanWrite {
			get { return true; }
		}

		public override void Flush() {
		}

		public override long Length {
			get { return length; }
		}

		public override long Position {
			get { return offset; }
			set { offset = value; }
		}

		public override int Read(byte[] buffer, int offset, int count) {
			throw new NotImplementedException();
		}

		public override long Seek(long offset, SeekOrigin origin) {
			switch (origin) {
			case SeekOrigin.Begin:
				this.offset = offset;
				break;

			case SeekOrigin.Current:
				this.offset += offset;
				break;

			case SeekOrigin.End:
				this.offset = length + offset;
				break;

			default:
				throw new NotSupportedException();
			}

			return this.offset;
		}

		public override void SetLength(long value) {
			this.length = value;
		}

		public override void Write(byte[] buffer, int offset, int count) {
			this.offset += count;
			if (this.offset > this.length)
				this.length = this.offset;
		}
	}
}