Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Net / System / Net / SocketAddress.cs / 1 / SocketAddress.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Net { using System; using System.Runtime.InteropServices; using System.Net.Sockets; using System.Text; using System.Globalization; // a little perf app measured these times when comparing the internal // buffer implemented as a managed byte[] or unmanaged memory IntPtr // that's why we use byte[] // byte[] total ms:19656 // IntPtr total ms:25671 ////// public class SocketAddress { internal const int IPv6AddressSize = 28; internal const int IPv4AddressSize = 16; internal int m_Size; internal byte[] m_Buffer; private const int WriteableOffset = 2; private const int MaxSize = 32; // IrDA requires 32 bytes private bool m_changed = true; private int m_hash; // // Address Family // ////// This class is used when subclassing EndPoint, and provides indication /// on how to format the memeory buffers that winsock uses for network addresses. /// ////// public AddressFamily Family { get { int family; #if BIGENDIAN family = ((int)m_Buffer[0]<<8) | m_Buffer[1]; #else family = m_Buffer[0] | ((int)m_Buffer[1]<<8); #endif return (AddressFamily)family; } } // // Size of this SocketAddress // ///[To be supplied.] ////// public int Size { get { return m_Size; } } // // access to unmanaged serialized data. this doesn't // allow access to the first 2 bytes of unmanaged memory // that are supposed to contain the address family which // is readonly. // //[To be supplied.] ///you can still use negative offsets as a back door in case // winsock changes the way it uses SOCKADDR. maybe we want to prohibit it? // maybe we should make the class sealed to avoid potentially dangerous calls // into winsock with unproperly formatted data? // ////// public byte this[int offset] { get { // // access // if (offset<0 || offset>=Size) { throw new IndexOutOfRangeException(); } return m_Buffer[offset]; } set { if (offset<0 || offset>=Size) { throw new IndexOutOfRangeException(); } if (m_Buffer[offset] != value) { m_changed = true; } m_Buffer[offset] = value; } } ///[To be supplied.] ////// public SocketAddress(AddressFamily family) : this(family, MaxSize) { } ///[To be supplied.] ////// public SocketAddress(AddressFamily family, int size) { if (size[To be supplied.] ///>8)); m_Buffer[1] = unchecked((byte)((int)family )); #else m_Buffer[0] = unchecked((byte)((int)family )); m_Buffer[1] = unchecked((byte)((int)family>>8)); #endif } // // For ReceiveFrom we need to pin address size, using reserved m_Buffer space // internal void CopyAddressSizeIntoBuffer() { m_Buffer[m_Buffer.Length-IntPtr.Size] = unchecked((byte)(m_Size)); m_Buffer[m_Buffer.Length-IntPtr.Size+1] = unchecked((byte)(m_Size >> 8)); m_Buffer[m_Buffer.Length-IntPtr.Size+2] = unchecked((byte)(m_Size >> 16)); m_Buffer[m_Buffer.Length-IntPtr.Size+3] = unchecked((byte)(m_Size >> 24)); } // // Can be called after the above method did work // internal int GetAddressSizeOffset() { return m_Buffer.Length-IntPtr.Size; } // // // For ReceiveFrom we need to update the address size upon IO return // internal unsafe void SetSize(IntPtr ptr) { // Apparently it must be less or equal the original value since ReceiveFrom cannot reallocate the address buffer m_Size = *(int*)ptr; } public override bool Equals(object comparand) { SocketAddress castedComparand = comparand as SocketAddress; if (castedComparand == null || this.Size != castedComparand.Size) { return false; } for(int i=0; i WriteableOffset) { bytes.Append(","); } bytes.Append(this[i].ToString(NumberFormatInfo.InvariantInfo)); } return Family.ToString() + ":" + Size.ToString(NumberFormatInfo.InvariantInfo) + ":{" + bytes.ToString() + "}"; } } // class SocketAddress } // namespace System.Net
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