netDxf/BinaryCodeValueReader.cs

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#region netDxf, Copyright(C) 2014 Daniel Carvajal, Licensed under LGPL.

//                        netDxf library
// Copyright (C) 2014 Daniel Carvajal (haplokuon@gmail.com)
// 
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
// 
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 

#endregion

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

namespace netDxf
{
    internal class BinaryCodeValueReader :
        ICodeValueReader
    {
        private readonly BinaryReader reader;
        private short code;
        private object value;

        public BinaryCodeValueReader(BinaryReader reader)
        {
            this.reader = reader;
            byte[] sentinel = this.reader.ReadBytes(22);
            StringBuilder sb = new StringBuilder(18);
            for (int i = 0; i < 18; i++)
            {
                sb.Append((char)sentinel[i]);
            }
            if (sb.ToString() != "AutoCAD Binary DXF")
                throw new ArgumentException("Not a valid binary dxf.");

            this.code = 0;
            this.value = null;
        }

        public short Code
        {
            get { return this.code; }
        }

        public object Value
        {
            get { return this.value; }