仿真平台内核初版 -tlib库 包含<sparc arm riscv powerPC>

lib/Packet.Net/PacketDotNet/LLDP/StringTLV.cs

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+/*
+This file is part of PacketDotNet
+
+PacketDotNet 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 3 of the License, or
+(at your option) any later version.
+
+PacketDotNet 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 PacketDotNet.  If not, see <http://www.gnu.org/licenses/>.
+*/
+/*
+ *  Copyright 2010 Evan Plaice <evanplaice@gmail.com>
+ *  Copyright 2010 Chris Morgan <chmorgan@gmail.com>
+ */
+using System;
+using PacketDotNet.Utils;
+
+namespace PacketDotNet.LLDP
+{
+    /// <summary>
+    /// Base class for several TLV types that all contain strings
+    /// </summary>
+    public class StringTLV : TLV
+    {
+        #region Constructors
+
+        /// <summary>
+        /// Creates a String TLV
+        /// </summary>
+        /// <param name="bytes">
+        /// </param>
+        /// <param name="offset">
+        /// The Port Description TLV's offset from the
+        /// origin of the LLDP
+        /// </param>
+        public StringTLV(byte[] bytes, int offset) :
+            base(bytes, offset)
+        {}
+
+        /// <summary>
+        /// Create from a type and string value
+        /// </summary>
+        /// <param name="tlvType">
+        /// A <see cref="TLVTypes"/>
+        /// </param>
+        /// <param name="StringValue">
+        /// A <see cref="System.String"/>
+        /// </param>
+        public StringTLV(TLVTypes tlvType, string StringValue)
+        {
+            var bytes = new byte[TLVTypeLength.TypeLengthLength];
+            var offset = 0;
+            tlvData = new ByteArraySegment(bytes, offset, bytes.Length);
+
+            Type = tlvType;
+            this.StringValue = StringValue;
+        }
+
+        #endregion
+
+        #region Properties
+
+        /// <value>
+        /// A textual Description of the port
+        /// </value>
+        public string StringValue
+        {
+            get
+            {
+                return System.Text.ASCIIEncoding.ASCII.GetString(tlvData.Bytes,
+                                                                 ValueOffset,
+                                                                 Length);
+            }
+
+            set
+            {
+                var bytes = System.Text.ASCIIEncoding.ASCII.GetBytes(value);
+                var length = TLVTypeLength.TypeLengthLength + bytes.Length;
+
+                // is the tlv the correct size?
+                if(tlvData.Length != length)
+                {
+                    // allocate new memory for this tlv
+                    var newTLVBytes = new byte[length];
+                    var offset = 0;
+
+                    // copy header over
+                    Array.Copy(tlvData.Bytes, tlvData.Offset,
+                               newTLVBytes, 0,
+                               TLVTypeLength.TypeLengthLength);
+
+                    tlvData = new ByteArraySegment(newTLVBytes, offset, length);
+                }
+
+                // set the description
+                Array.Copy(bytes, 0,
+                           tlvData.Bytes, ValueOffset,
+                           bytes.Length);
+            }
+        }
+
+        /// <summary>
+        /// Convert this Port Description TLV to a string.
+        /// </summary>
+        /// <returns>
+        /// A human readable string
+        /// </returns>
+        public override string ToString ()
+        {
+            return string.Format("[{0}: Description={0}]", Type, StringValue);
+        }
+
+        #endregion
+    }
+}