// SNMP COUNTER32 type.// Copyright (C) 2008-2010 Malcolm Crowe, Lex Li, and other contributors.// // Permission is hereby granted, free of charge, to any person obtaining a copy of this// software and associated documentation files (the "Software"), to deal in the Software// without restriction, including without limitation the rights to use, copy, modify, merge,// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons// to whom the Software is furnished to do so, subject to the following conditions:// // 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.using System;using System.Collections.Generic;using System.Globalization;using System.IO; namespace GSF.Net.Snmp{    /// <summary>    /// Counter32 type.    /// </summary>    public sealed class Counter32 : ISnmpData, IEquatable<Counter32>    {        private readonly uint _count;        private readonly byte[] _length;         private byte[] _raw;         /// <summary>        /// Creates a <see cref="Counter32"/> instance from raw bytes.        /// </summary>        /// <param name="raw"></param>        internal Counter32(byte[] raw) : this(new Tuple<int, byte[]>(raw.Length, raw.Length.WritePayloadLength()), new MemoryStream(raw))        {            // IMPORTANT: for test project only.        }                /// <summary>        /// Creates a <see cref="Counter32"/> with a specific <see cref="UInt32"/>.        /// </summary>        /// <param name="value">Value</param>        [CLSCompliant(false)]        public Counter32(uint value)        {            _count = value;        }         /// <summary>        /// Initializes a new instance of the <see cref="Counter32"/> class.        /// </summary>        /// <param name="value">The value.</param>        public Counter32(long value)        {            _count = (uint)value;        }         /// <summary>        /// Creates a <see cref="Counter32"/> instance from stream.        /// </summary>        /// <param name="length">The length.</param>        /// <param name="stream">The stream.</param>        public Counter32(Tuple<int, byte[]> length, Stream stream)        {            if (length == null)            {                throw new ArgumentNullException(nameof(length));            }             if (stream == null)            {                throw new ArgumentNullException(nameof(stream));            }             if (length.Item1 < 1 || length.Item1 > 5)            {                throw new ArgumentException("Byte length must between 1 and 5.", nameof(length));            }             _raw = new byte[length.Item1];            stream.Read(_raw, 0, length.Item1);             // TODO: improve here to read from stream directly.            if (length.Item1 == 5 && _raw[0] != 0)            {                throw new ArgumentException("If byte length is 5, then first byte must be 0.", nameof(length));            }             List<byte> list = new List<byte>(_raw);            list.Reverse();            while (list.Count > 4)            {                list.RemoveAt(list.Count - 1);            }             while (list.Count < 4)            {                list.Add(0);            }             _count = BitConverter.ToUInt32(list.ToArray(), 0);            _length = length.Item2;        }         #region ISnmpData Members        /// <summary>        /// Type code.        /// </summary>        public SnmpType TypeCode        {            get { return SnmpType.Counter32; }        }         /// <summary>        /// Appends the bytes to <see cref="Stream"/>.        /// </summary>        /// <param name="stream">The stream.</param>        public void AppendBytesTo(Stream stream)        {            if (stream == null)            {                throw new ArgumentNullException(nameof(stream));            }                        stream.AppendBytes(TypeCode, _length, GetRaw());        }         #endregion        /// <summary>        /// Returns a <see cref="UInt32"/> that represents a <see cref="Counter32"/>.        /// </summary>        /// <returns>A <c>uint</c> that represents the current object.</returns>        [CLSCompliant(false)]        public uint ToUInt32()        {            return _count;        }         /// <summary>        /// Returns a <see cref="String"/> that represents this <see cref="Counter32"/>.        /// </summary>        /// <returns>A string that represents the current object.</returns>        public override string ToString()        {            return ToUInt32().ToString(CultureInfo.InvariantCulture);        }         /// <summary>        /// Gets that raw bytes.        /// </summary>        /// <returns></returns>        internal byte[] GetRaw()        {            return _raw ?? (_raw = ByteTool.GetRawBytes(BitConverter.GetBytes(_count), false));        }         /// <summary>        /// Indicates whether the current object is equal to another object of the same type.        /// </summary>        /// <param name="other">An object to compare with this object.</param>        /// <returns><value>true</value> if the current object is equal to the <paramref name="other"/> parameter; otherwise, <value>false</value>.        /// </returns>        public bool Equals(Counter32 other)        {            return Equals(this, other);        }                /// <summary>        /// Determines whether the specified <see cref="Object"/> is equal to the current <see cref="Counter32"/>.        /// </summary>        /// <param name="obj">The <see cref="Object"/> to compare with the current <see cref="Counter32"/>. </param>        /// <returns><value>true</value> if the specified <see cref="Object"/> is equal to the current <see cref="Counter32"/>; otherwise, <value>false</value>.        /// </returns>        public override bool Equals(object obj)        {            return Equals(this, obj as Counter32);        }                /// <summary>        /// Serves as a hash function for a particular type.        /// </summary>        /// <returns>A hash code for the current <see cref="Counter32"/>.</returns>        public override int GetHashCode()        {            return ToUInt32().GetHashCode();        }                /// <summary>        /// The equality operator.        /// </summary>        /// <param name="left">Left <see cref="Counter32"/> object</param>        /// <param name="right">Right <see cref="Counter32"/> object</param>        /// <returns>        /// Returns <c>true</c> if the values of its operands are equal, <c>false</c> otherwise.</returns>        public static bool operator ==(Counter32 left, Counter32 right)        {            return Equals(left, right);        }                /// <summary>        /// The inequality operator.        /// </summary>        /// <param name="left">Left <see cref="Counter32"/> object</param>        /// <param name="right">Right <see cref="Counter32"/> object</param>        /// <returns>        /// Returns <c>true</c> if the values of its operands are not equal, <c>false</c> otherwise.</returns>        public static bool operator !=(Counter32 left, Counter32 right)        {            return !(left == right);        }                /// <summary>        /// The comparison.        /// </summary>        /// <param name="left">Left <see cref="Counter32"/> object</param>        /// <param name="right">Right <see cref="Counter32"/> object</param>        /// <returns>        /// Returns <c>true</c> if the values of its operands are not equal, <c>false</c> otherwise.</returns>        private static bool Equals(Counter32 left, Counter32 right)        {            object lo = left;            object ro = right;            if (lo == ro)            {                return true;            }             if (lo == null || ro == null)            {                return false;            }                        return left.ToUInt32() == right.ToUInt32();        }         internal byte[] GetLengthBytes()        {            return _length;        }    }}