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

lib/Packet.Net/PacketDotNet/Ieee80211/QosDataFrame.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 2012 Alan Rushforth <alan.rushforth@gmail.com>
+ */
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using MiscUtil.Conversion;
+using PacketDotNet.Utils;
+
+namespace PacketDotNet
+{
+    namespace Ieee80211
+    {
+        /// <summary>
+        /// Qos data frames are like regualr data frames except they contain a quality of service 
+        /// field as deinfed in the 802.11e standard.
+        /// </summary>
+        public class QosDataFrame : DataFrame
+        {
+            private class QosDataField
+            {
+                public readonly static int QosControlLength = 2;
+
+                public readonly static int QosControlPosition;
+
+                static QosDataField()
+                {
+                    QosControlPosition = MacFields.SequenceControlPosition + MacFields.SequenceControlLength;
+                }
+            }
+   
+            /// <summary>
+            /// Gets or sets the qos control field.
+            /// </summary>
+            /// <value>
+            /// The qos control field.
+            /// </value>
+            public UInt16 QosControl { get; set; }
+
+            private UInt16 QosControlBytes
+            {
+                get
+                {
+					if(header.Length >= (QosDataField.QosControlPosition + QosDataField.QosControlLength))
+					{
+						return EndianBitConverter.Little.ToUInt16(header.Bytes,
+						                                          header.Offset + QosDataField.QosControlPosition);
+					}
+					else
+					{
+						return 0;
+					}
+                }
+
+                set
+                {
+                    EndianBitConverter.Little.CopyBytes(value,
+                                                     header.Bytes,
+                                                     header.Offset + QosDataField.QosControlPosition);
+                }
+            }
+
+            /// <summary>
+            /// Length of the frame header.
+            /// 
+            /// This does not include the FCS, it represents only the header bytes that would
+            /// would preceed any payload.
+            /// </summary>
+            public override int FrameSize
+            {
+                get
+                {
+                    //if we are in WDS mode then there are 4 addresses (normally it is just 3)
+                    int numOfAddressFields = (FrameControl.ToDS && FrameControl.FromDS) ? 4 : 3;
+
+                    return (MacFields.FrameControlLength +
+                        MacFields.DurationIDLength +
+                        (MacFields.AddressLength * numOfAddressFields) +
+                        MacFields.SequenceControlLength +
+                        QosDataField.QosControlLength);
+                }
+            }
+
+
+            /// <summary>
+            /// Initializes a new instance of the <see cref="PacketDotNet.Ieee80211.QosDataFrame"/> class.
+            /// </summary>
+            /// <param name='bas'>
+            /// A <see cref="ByteArraySegment"/>
+            /// </param>
+            public QosDataFrame (ByteArraySegment bas)
+            {
+                header = new ByteArraySegment (bas);
+
+                FrameControl = new FrameControlField (FrameControlBytes);
+                Duration = new DurationField (DurationBytes);
+                SequenceControl = new SequenceControlField (SequenceControlBytes);
+                QosControl = QosControlBytes;
+                ReadAddresses ();
+                
+                header.Length = FrameSize;
+                var availablePayloadLength = GetAvailablePayloadLength();
+                if(availablePayloadLength > 0)
+				{
+					payloadPacketOrData.TheByteArraySegment = header.EncapsulatedBytes (availablePayloadLength);
+				}
+            }
+            
+            /// <summary>
+            /// Initializes a new instance of the <see cref="PacketDotNet.Ieee80211.QosDataFrame"/> class.
+            /// </summary>
+            public QosDataFrame ()
+            {
+                this.FrameControl = new FrameControlField ();
+                this.Duration = new DurationField ();
+                this.SequenceControl = new SequenceControlField ();
+                AssignDefaultAddresses ();
+                
+                FrameControl.SubType = FrameControlField.FrameSubTypes.QosData;
+            }
+            
+            /// <summary>
+            /// Writes the current packet properties to the backing ByteArraySegment.
+            /// </summary>
+            public override void UpdateCalculatedValues ()
+            {
+                if ((header == null) || (header.Length > (header.BytesLength - header.Offset)) || (header.Length < FrameSize))
+                {
+                    header = new ByteArraySegment (new Byte[FrameSize]);
+                }
+                
+                this.FrameControlBytes = this.FrameControl.Field;
+                this.DurationBytes = this.Duration.Field;
+                this.SequenceControlBytes = this.SequenceControl.Field;
+                this.QosControlBytes = this.QosControl;
+                WriteAddressBytes ();
+            }
+        } 
+    }
+}