//******************************************************************************************************//  BinaryImageBase.cs - Gbtc////  Copyright © 2012, Grid Protection Alliance.  All Rights Reserved.////  Licensed to the Grid Protection Alliance (GPA) under one or more contributor license agreements. See//  the NOTICE file distributed with this work for additional information regarding copyright ownership.//  The GPA licenses this file to you under the MIT License (MIT), the "License"; you may//  not use this file except in compliance with the License. You may obtain a copy of the License at:////      http://www.opensource.org/licenses/MIT////  Unless agreed to in writing, the subject software distributed under the License is distributed on an//  "AS-IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. Refer to the//  License for the specific language governing permissions and limitations.////  Code Modification History://  ----------------------------------------------------------------------------------------------------//  01/06/2009 - J. Ritchie Carroll//       Generated original version of source code.//  09/14/2009 - Stephen C. Wills//       Added new header and license agreement.//  11/23/2011 - J. Ritchie Carroll//       Modified to support buffer optimized ISupportBinaryImage.//  12/14/2012 - Starlynn Danyelle Gilliam//       Modified Header.////****************************************************************************************************** using System; namespace GSF.Parsing{    /// <summary>    /// Defines a base class that represents binary images for parsing or generation in terms of a header, body and footer.    /// </summary>    [Serializable]    public abstract class BinaryImageBase : ISupportBinaryImage    {        #region [ Properties ]         /// <summary>        /// Gets the length of the <see cref="BinaryImageBase"/> object.        /// </summary>        /// <remarks>        /// This property is not typically overridden since it is the sum of the header, body and footer lengths.        /// </remarks>        public virtual int BinaryLength => HeaderLength + BodyLength + FooterLength;         /// <summary>        /// Gets the length of the header portion of the <see cref="BinaryImageBase"/> object.        /// </summary>        /// <remarks>        /// This property is typically overridden by a specific protocol implementation.        /// </remarks>        protected virtual int HeaderLength => 0;         /// <summary>        /// Gets the length of the body portion of the <see cref="BinaryImageBase"/> object.        /// </summary>        /// <remarks>        /// This property is typically overridden by a specific protocol implementation.        /// </remarks>        protected virtual int BodyLength => 0;         /// <summary>        /// Gets the length of the footer portion of the <see cref="BinaryImageBase"/> object.        /// </summary>        /// <remarks>        /// This property is typically overridden by a specific protocol implementation.        /// </remarks>        protected virtual int FooterLength => 0;         #endregion         #region [ Methods ]         /// <summary>        /// Initializes object by parsing the specified <paramref name="buffer"/> containing a binary image.        /// </summary>        /// <param name="buffer">Buffer containing binary image to parse.</param>        /// <param name="startIndex">0-based starting index in the <paramref name="buffer"/> to start parsing.</param>        /// <param name="length">Valid number of bytes within <paramref name="buffer"/> from <paramref name="startIndex"/>.</param>        /// <returns>The number of bytes used for initialization in the <paramref name="buffer"/> (i.e., the number of bytes parsed).</returns>        /// <exception cref="ArgumentNullException"><paramref name="buffer"/> is null.</exception>        /// <exception cref="ArgumentOutOfRangeException">        /// <paramref name="startIndex"/> or <paramref name="length"/> is less than 0 -or-         /// <paramref name="startIndex"/> and <paramref name="length"/> will exceed <paramref name="buffer"/> length.        /// </exception>        /// <remarks>        /// This method is not typically overridden since it is parses the header, body and footer images in sequence.        /// </remarks>        public virtual int ParseBinaryImage(byte[] buffer, int startIndex, int length)        {            buffer.ValidateParameters(startIndex, length);             int index = startIndex;             // Parse out header, body and footer images            index += ParseHeaderImage(buffer, index, length);            index += ParseBodyImage(buffer, index, length - (index - startIndex));            index += ParseFooterImage(buffer, index, length - (index - startIndex));             return index - startIndex;        }         /// <summary>        /// Parses the binary header image.        /// </summary>        /// <param name="buffer">Buffer containing binary image to parse.</param>        /// <param name="startIndex">0-based starting index in the <paramref name="buffer"/> to start parsing.</param>        /// <param name="length">Valid number of bytes within <paramref name="buffer"/> from <paramref name="startIndex"/>.</param>        /// <returns>The number of bytes used for initialization in the <paramref name="buffer"/> (i.e., the number of bytes parsed).</returns>        /// <remarks>        /// This method is typically overridden by a specific protocol implementation.        /// </remarks>        protected virtual int ParseHeaderImage(byte[] buffer, int startIndex, int length) => 0;         /// <summary>        /// Parses the binary body image.        /// </summary>        /// <param name="buffer">Buffer containing binary image to parse.</param>        /// <param name="startIndex">0-based starting index in the <paramref name="buffer"/> to start parsing.</param>        /// <param name="length">Valid number of bytes within <paramref name="buffer"/> from <paramref name="startIndex"/>.</param>        /// <returns>The number of bytes used for initialization in the <paramref name="buffer"/> (i.e., the number of bytes parsed).</returns>        /// <remarks>        /// This method is typically overridden by a specific protocol implementation.        /// </remarks>        protected virtual int ParseBodyImage(byte[] buffer, int startIndex, int length) => 0;         /// <summary>        /// Parses the binary footer image.        /// </summary>        /// <param name="buffer">Buffer containing binary image to parse.</param>        /// <param name="startIndex">0-based starting index in the <paramref name="buffer"/> to start parsing.</param>        /// <param name="length">Valid number of bytes within <paramref name="buffer"/> from <paramref name="startIndex"/>.</param>        /// <returns>The number of bytes used for initialization in the <paramref name="buffer"/> (i.e., the number of bytes parsed).</returns>        /// <remarks>        /// This method is typically overridden by a specific protocol implementation.        /// </remarks>        protected virtual int ParseFooterImage(byte[] buffer, int startIndex, int length) => 0;         /// <summary>        /// Generates binary image of the object and copies it into the given buffer, for <see cref="ISupportBinaryImage.BinaryLength"/> bytes.        /// </summary>        /// <param name="buffer">Buffer used to hold generated binary image of the source object.</param>        /// <param name="startIndex">0-based starting index in the <paramref name="buffer"/> to start writing.</param>        /// <returns>The number of bytes written to the <paramref name="buffer"/>.</returns>        /// <exception cref="ArgumentNullException"><paramref name="buffer"/> is null.</exception>        /// <exception cref="ArgumentOutOfRangeException">        /// <paramref name="startIndex"/> or <see cref="ISupportBinaryImage.BinaryLength"/> is less than 0 -or-         /// <paramref name="startIndex"/> and <see cref="ISupportBinaryImage.BinaryLength"/> will exceed <paramref name="buffer"/> length.        /// </exception>        /// <remarks>        /// This property is not typically overridden since it is the generates the combination of the header, body and footer images.        /// </remarks>        public virtual int GenerateBinaryImage(byte[] buffer, int startIndex)        {            buffer.ValidateParameters(startIndex, BinaryLength);             int index = startIndex;             // Generate header, body and footer images            index += GenerateHeaderImage(buffer, index);            index += GenerateBodyImage(buffer, index);            index += GenerateFooterImage(buffer, index);             return index - startIndex;        }         /// <summary>        /// Generates the binary header image and copies it into the given buffer, for <see cref="HeaderLength"/> bytes.        /// </summary>        /// <param name="buffer">Buffer used to hold generated binary image of the source object.</param>        /// <param name="startIndex">0-based starting index in the <paramref name="buffer"/> to start writing.</param>        /// <returns>The number of bytes written to the <paramref name="buffer"/>.</returns>        /// <remarks>        /// This method is typically overridden by a specific protocol implementation.        /// </remarks>        protected virtual int GenerateHeaderImage(byte[] buffer, int startIndex) => 0;         /// <summary>        /// Generates the binary body image and copies it into the given buffer, for <see cref="BodyLength"/> bytes.        /// </summary>        /// <param name="buffer">Buffer used to hold generated binary image of the source object.</param>        /// <param name="startIndex">0-based starting index in the <paramref name="buffer"/> to start writing.</param>        /// <returns>The number of bytes written to the <paramref name="buffer"/>.</returns>        /// <remarks>        /// This method is typically overridden by a specific protocol implementation.        /// </remarks>        protected virtual int GenerateBodyImage(byte[] buffer, int startIndex) => 0;         /// <summary>        /// Generates the binary footer image and copies it into the given buffer, for <see cref="FooterLength"/> bytes.        /// </summary>        /// <param name="buffer">Buffer used to hold generated binary image of the source object.</param>        /// <param name="startIndex">0-based starting index in the <paramref name="buffer"/> to start writing.</param>        /// <returns>The number of bytes written to the <paramref name="buffer"/>.</returns>        /// <remarks>        /// This method is typically overridden by a specific protocol implementation.        /// </remarks>        protected virtual int GenerateFooterImage(byte[] buffer, int startIndex) => 0;         #endregion    }}