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

lib/Packet.Net/PacketDotNet/PacketOrByteArraySegment.cs

@@ -0,0 +1,118 @@
+/*
+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 Chris Morgan <chmorgan@gmail.com>
+ */
+
+using System;
+using System.IO;
+using PacketDotNet.Utils;
+
+namespace PacketDotNet
+{
+    /// <summary>
+    /// Encapsulates and ensures that we have either a Packet OR
+    /// a ByteArraySegment but not both
+    /// </summary>
+    public class PacketOrByteArraySegment
+    {
+        private ByteArraySegment theByteArraySegment;
+
+        /// <summary>
+        /// Gets or sets the byte array segment.
+        /// </summary>
+        /// <value>
+        /// The byte array segment.
+        /// </value>
+        public ByteArraySegment TheByteArraySegment
+        {
+            get
+            {
+                return theByteArraySegment;
+            }
+
+            set
+            {
+                thePacket = null;
+                theByteArraySegment = value;
+            }
+        }
+
+        private Packet thePacket;
+
+        /// <summary>
+        /// Gets or sets the packet.
+        /// </summary>
+        /// <value>
+        /// The packet.
+        /// </value>
+        public Packet ThePacket
+        {
+            get
+            {
+                return thePacket;
+            }
+
+            set
+            {
+                theByteArraySegment = null;
+                thePacket = value;
+            }
+        }
+
+        /// <summary>
+        /// Appends to the MemoryStream either the byte[] represented by TheByteArray, or
+        /// if ThePacket is non-null, the Packet.Bytes will be appended to the memory stream
+        /// which will append ThePacket's header and any encapsulated packets it contains
+        /// </summary>
+        /// <param name="ms">
+        /// A <see cref="MemoryStream"/>
+        /// </param>
+        public void AppendToMemoryStream(MemoryStream ms)
+        {
+            if(ThePacket != null)
+            {
+                var theBytes = ThePacket.Bytes;
+                ms.Write(theBytes, 0, theBytes.Length);
+            } else if(TheByteArraySegment != null)
+            {
+                var theBytes = TheByteArraySegment.ActualBytes();
+                ms.Write(theBytes, 0, theBytes.Length);
+            }
+        }
+
+        /// <value>
+        /// Whether or not this container contains a packet, a byte[] or neither
+        /// </value>
+        public PayloadType Type
+        {
+            get
+            {
+                if(ThePacket != null)
+                {
+                    return PayloadType.Packet;
+                } else if(TheByteArraySegment != null)
+                {
+                    return PayloadType.Bytes;
+                } else
+                {
+                    return PayloadType.None;
+                }
+            }
+        }
+    }
+}