using System;
using System.Text;
using XYLEM.Communication;

namespace XYLEM.Communication.ValueEncoders {
	public static class StringEncoder_W1252 {
		public static Encoding GetDefaultEncoding( ) {			
			return Encoding.GetEncoding( 1252 );
		}

		/// <summary>
		/// Standard Windows 1252-encoding page.
		/// </summary>
		static Encoding s_Win1252 = GetDefaultEncoding( );

		public static byte[] Encode(string value, int lenght) {
			if (value.Length > lenght) {
				throw new ArgumentException( "value.Length is too long", "value" );
			}

			var result = new byte[ lenght ];
			s_Win1252.GetBytes( value ).CopyTo( result, 0 );
			return result;
		}

		public static string Decode(byte[] value, int lenght) {
			if (value.Length > lenght) {
				throw new ArgumentException( "value.Length wrong lenght", "value" );
			}

			var result = s_Win1252.GetString( value );
			var index = result.IndexOf( '\0' );
			if (index >= 0)
				return result.Substring( 0, result.IndexOf( '\0' ) );
			else
				return result;
		}
	}
}