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

lib/Packet.Net/PacketDotNet/Ieee80211/BlockAcknowledgmentRequestFrame.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 System.Net.NetworkInformation;
+using PacketDotNet.Utils;
+using MiscUtil.Conversion;
+
+namespace PacketDotNet
+{
+    namespace Ieee80211
+    {
+        /// <summary>
+        /// Block acknowledgment request frame.
+        /// </summary>
+        public class BlockAcknowledgmentRequestFrame : MacFrame
+        {
+            private class BlockAckRequestField
+            {
+                public readonly static int BlockAckRequestControlLength = 2;
+                public readonly static int BlockAckStartingSequenceControlLength = 2;
+
+                public readonly static int BlockAckRequestControlPosition;
+                public readonly static int BlockAckStartingSequenceControlPosition;
+
+                static BlockAckRequestField()
+                {
+                    BlockAckRequestControlPosition = MacFields.DurationIDPosition + MacFields.DurationIDLength + (2 * MacFields.AddressLength);
+                    BlockAckStartingSequenceControlPosition = BlockAckRequestControlPosition + BlockAckRequestControlLength;
+                }
+            }
+
+            /// <summary>
+            /// Receiver address
+            /// </summary>
+            public PhysicalAddress ReceiverAddress {get; set;}
+
+            /// <summary>
+            /// Transmitter address
+            /// </summary>
+            public PhysicalAddress TransmitterAddress {get; set;}
+
+            /// <summary>
+            /// Block acknowledgment control bytes are the first two bytes of the frame
+            /// </summary>
+            private UInt16 BlockAckRequestControlBytes
+            {
+                get
+                {
+					if(header.Length >= 
+					   (BlockAckRequestField.BlockAckRequestControlPosition + 
+					    BlockAckRequestField.BlockAckRequestControlLength))
+					{
+						return EndianBitConverter.Little.ToUInt16(header.Bytes,
+						                                          header.Offset + BlockAckRequestField.BlockAckRequestControlPosition);
+					}
+					else
+					{
+						return 0;
+					}
+                }
+
+                set
+                {
+                    EndianBitConverter.Little.CopyBytes(value,
+                                                     header.Bytes,
+                                                     header.Offset + BlockAckRequestField.BlockAckRequestControlPosition);
+                }
+            }
+
+            /// <summary>
+            /// Block acknowledgment control field
+            /// </summary>
+            public BlockAcknowledgmentControlField BlockAcknowledgmentControl
+            {
+                get;
+                set;
+            }
+            
+            /// <summary>
+            /// Gets or sets the sequence number of the first MSDU for which this 
+            /// block acknowledgement request frame is sent
+            /// </summary>
+            /// <value>
+            /// The block ack starting sequence control field value
+            /// </value>
+            public UInt16 BlockAckStartingSequenceControl {get; set;}
+                
+            /// <summary>
+            /// Gets or sets the block ack starting sequence control.
+            /// </summary>
+            /// <value>
+            /// The block ack starting sequence control.
+            /// </value>
+            private UInt16 BlockAckStartingSequenceControlBytes
+            {
+                get
+                {
+					if(header.Length >= 
+					   (BlockAckRequestField.BlockAckStartingSequenceControlPosition + 
+					    BlockAckRequestField.BlockAckStartingSequenceControlLength))
+					{
+						return EndianBitConverter.Little.ToUInt16(header.Bytes,
+						                                          header.Offset + BlockAckRequestField.BlockAckStartingSequenceControlPosition);
+					}
+					else
+					{
+						return 0;
+					}
+                }
+
+                set
+                {
+                    EndianBitConverter.Little.CopyBytes(value,
+                        header.Bytes,
+                        header.Offset + BlockAckRequestField.BlockAckStartingSequenceControlPosition);
+                }
+            }
+
+
+            /// <summary>
+            /// Length of the frame
+            /// </summary>
+            override public int FrameSize
+            {
+                get
+                {
+                    return (MacFields.FrameControlLength +
+                        MacFields.DurationIDLength +
+                        (MacFields.AddressLength * 2) +
+                        BlockAckRequestField.BlockAckRequestControlLength +
+                        BlockAckRequestField.BlockAckStartingSequenceControlLength);
+                }
+            }
+
+            /// <summary>
+            /// Constructor
+            /// </summary>
+            /// <param name="bas">
+            /// A <see cref="ByteArraySegment"/>
+            /// </param>
+            public BlockAcknowledgmentRequestFrame (ByteArraySegment bas)
+            {
+                header = new ByteArraySegment (bas);
+
+                FrameControl = new FrameControlField (FrameControlBytes);
+                Duration = new DurationField (DurationBytes);
+                ReceiverAddress = GetAddress (0);
+                TransmitterAddress = GetAddress (1);
+                BlockAcknowledgmentControl = new BlockAcknowledgmentControlField (BlockAckRequestControlBytes);
+                BlockAckStartingSequenceControl = BlockAckStartingSequenceControlBytes;
+                
+                header.Length = FrameSize;
+            }
+            
+            /// <summary>
+            /// Initializes a new instance of the <see cref="PacketDotNet.Ieee80211.BlockAcknowledgmentRequestFrame"/> class.
+            /// </summary>
+            /// <param name='TransmitterAddress'>
+            /// Transmitter address.
+            /// </param>
+            /// <param name='ReceiverAddress'>
+            /// Receiver address.
+            /// </param>
+            public BlockAcknowledgmentRequestFrame (PhysicalAddress TransmitterAddress,
+                                                    PhysicalAddress ReceiverAddress)
+            {
+                this.FrameControl = new FrameControlField ();
+                this.Duration = new DurationField ();
+                this.ReceiverAddress = ReceiverAddress;
+                this.TransmitterAddress = TransmitterAddress;
+                this.BlockAcknowledgmentControl = new BlockAcknowledgmentControlField ();
+                
+                this.FrameControl.SubType = FrameControlField.FrameSubTypes.ControlBlockAcknowledgmentRequest;
+            }
+            
+            /// <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;
+                SetAddress (0, ReceiverAddress);
+                SetAddress (1, TransmitterAddress);
+                
+                this.BlockAckRequestControlBytes = this.BlockAcknowledgmentControl.Field;
+                this.BlockAckStartingSequenceControlBytes = this.BlockAckStartingSequenceControl;
+                
+                header.Length = FrameSize;
+            }
+            
+            /// <summary>
+            /// Returns a string with a description of the addresses used in the packet.
+            /// This is used as a compoent of the string returned by ToString().
+            /// </summary>
+            /// <returns>
+            /// The address string.
+            /// </returns>
+            protected override String GetAddressString()
+            {
+                return String.Format("RA {0} TA {1}", ReceiverAddress, TransmitterAddress);
+            }
+        } 
+    }
+}