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IsoHandlerBox.cs

//
// IsoHandlerBox.cs: Provides an implementation of a ISO/IEC 14496-12
// HandlerBox.
//
// Author:
//   Brian Nickel (brian.nickel@gmail.com)
//
// Copyright (C) 2006-2007 Brian Nickel
// 
// This library is free software; you can redistribute it and/or modify
// it  under the terms of the GNU Lesser General Public License version
// 2.1 as published by the Free Software Foundation.
//
// This library 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
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
// USA
//

using System;

namespace TagLib.Mpeg4 {
      /// <summary>
      ///    This class extends <see cref="FullBox" /> to provide an
      ///    implementation of a ISO/IEC 14496-12 FullBox.
      /// </summary>
00032       public class IsoHandlerBox : FullBox
      {
            #region Private Fields
            
            /// <summary>
            ///    Contains the handler type.
            /// </summary>
00039             private ByteVector handler_type;
            
            /// <summary>
            ///    Contains the handler name.
            /// </summary>
00044             private string name;
            
            #endregion
            
            
            
            #region Constructors
            
            /// <summary>
            ///    Constructs and initializes a new instance of <see
            ///    cref="IsoHandlerBox" /> with a provided header and
            ///    handler by reading the contents from a specified file.
            /// </summary>
            /// <param name="header">
            ///    A <see cref="BoxHeader" /> object containing the header
            ///    to use for the new instance.
            /// </param>
            /// <param name="file">
            ///    A <see cref="TagLib.File" /> object to read the contents
            ///    of the box from.
            /// </param>
            /// <param name="handler">
            ///    A <see cref="IsoHandlerBox" /> object containing the
            ///    handler that applies to the new instance.
            /// </param>
            /// <exception cref="ArgumentNullException">
            ///    <paramref name="file" /> is <see langword="null" />.
            /// </exception>
00072             public IsoHandlerBox (BoxHeader header, TagLib.File file,
                                  IsoHandlerBox handler)
                  : base (header, file, handler)
            {
                  if (file == null)
                        throw new System.ArgumentNullException ("file");
                  
                  file.Seek (DataPosition + 4);
                  ByteVector box_data = file.ReadBlock (DataSize - 4);
                  handler_type = box_data.Mid (0, 4);
                  
                  int end = box_data.Find ((byte) 0, 16);
                  if (end < 16)
                        end = box_data.Count;
                  name = box_data.ToString (StringType.UTF8, 16, end - 16);
            }
            
            /// <summary>
            ///    Constructs and initializes a new instance of <see
            ///    cref="IsoHandlerBox" /> with a specified type and name.
            /// </summary>
            /// <param name="handlerType">
            ///    A <see cref="ByteVector" /> object specifying a 4 byte
            ///    handler type.
            /// </param>
            /// <param name="name">
            ///    A <see cref="string" /> object specifying the handler
            ///    name.
            /// </param>
            /// <exception cref="ArgumentNullException">
            ///    <paramref name="handlerType" /> is <see langword="null"
            ///    />.
            /// </exception>
            /// <exception cref="ArgumentException">
            ///    <paramref name="handlerType" /> is less than 4 bytes
            ///    long.
            /// </exception>
00109             public IsoHandlerBox (ByteVector handlerType, string name)
                  : base ("hdlr", 0, 0)
            {
                  if (handlerType == null)
                        throw new ArgumentNullException ("handlerType");
                  
                  if (handlerType.Count < 4)
                        throw new ArgumentException (
                              "The handler type must be four bytes long.",
                              "handlerType");
                  
                  this.handler_type = handlerType.Mid (0,4);
                  this.name = name;
            }
            
            #endregion
            
            
            
            #region Public Properties
            
            /// <summary>
            ///    Gets the data contained in the current instance.
            /// </summary>
            /// <value>
            ///    A <see cref="ByteVector" /> object containing the
            ///    rendered version of the data contained in the current
            ///    instance.
            /// </value>
00138             public override ByteVector Data {
                  get {
                        ByteVector output = new ByteVector (4);
                        output.Add (handler_type);
                        output.Add (new ByteVector (12));
                        output.Add (ByteVector.FromString (name,
                              StringType.UTF8));
                        output.Add (new ByteVector (2));
                        return output;
                  }
            }
            
            /// <summary>
            ///    Gets the handler type of the current instance.
            /// </summary>
            /// <value>
            ///    A <see cref="ByteVector" /> object containing the
            ///    handler type of the current instance.
            /// </value>
00157             public ByteVector HandlerType {
                  get {return handler_type;}
            }
            
            /// <summary>
            ///    Gets the name of the current instance.
            /// </summary>
            /// <value>
            ///    A <see cref="string" /> object containing the name of the
            ///    current instance.
            /// </value>
00168             public string Name {
                  get {return name;}
            }
            
            #endregion
      }
}

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