#region Copyright & License Information
/*
 * Copyright 2007-2020 The OpenRA Developers (see AUTHORS)
 * This file is part of OpenRA, which is free software. It is made
 * available to you 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. For more
 * information, see COPYING.
 */
#endregion

using System;

namespace OpenRA.Mods.Common.FileFormats
{
	public class FastByteReader
	{
		readonly byte[] src;
		int offset;

		public FastByteReader(byte[] src, int offset = 0)
		{
			this.src = src;
			this.offset = offset;
		}

		public bool Done() { return offset >= src.Length; }
		public byte ReadByte() { return src[offset++]; }
		public int ReadWord()
		{
			var x = ReadByte();
			return x | (ReadByte() << 8);
		}

		public void CopyTo(byte[] dest, int offset, int count)
		{
			Array.Copy(src, this.offset, dest, offset, count);
			this.offset += count;
		}

		public int Remaining() { return src.Length - offset; }
	}
}
