using System;
using System.Collections.Generic;
using System.IO;
using System.Text;

namespace DFEngine.IO
{
	/// <summary>
	/// Class to read from a <see cref="Stream"/> of binary.
	/// </summary>
	public class BinaryReader : System.IO.BinaryReader
	{
		/// <summary>
		/// The length of the stream.
		/// </summary>
		public long Length => BaseStream.Length;

		/// <summary>
		/// Creates a new instance of the <see cref="BinaryReader"/> class.
		/// </summary>
		/// <param name="input">The stream to read from.</param>
		public BinaryReader(Stream input) : base(input)
		{
		}

		/// <summary>
		/// Reads a string from the binary stream.
		/// </summary>
		/// <param name="length">The length of the bytes to read.</param>
		/// <returns>The string that was read.</returns>
		public string ReadString(int length)
		{
			var ret = string.Empty;
			var offset = 0;
			var buffer = ReadBytes(length);

			while (offset < length && buffer[offset] != 0x00)
			{
				offset++;
			}

			if (length > 0)
			{
				ret = Encoding.UTF8.GetString(buffer, 0, offset);
			}

			return ret;
		}
	}
}