Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Net / System / Net / NetworkInformation / PhysicalAddress.cs / 1 / PhysicalAddress.cs
using System; using System.Text; namespace System.Net.NetworkInformation { public class PhysicalAddress { byte[] address = null; bool changed = true; int hash = 0; // FxCop: if this class is ever made mutable (like, given any non-readonly fields), // the readonly should be removed from the None decoration. public static readonly PhysicalAddress None = new PhysicalAddress(new byte[0]); // constructors public PhysicalAddress(byte[] address){ this.address = address; } public override int GetHashCode() { if (changed) { changed = false; hash = 0; int i; int size = address.Length & ~3; for (i = 0; i < size; i += 4) { hash ^= (int)address[i] | ((int)address[i+1] << 8) | ((int)address[i+2] << 16) | ((int)address[i+3] << 24); } if ((address.Length & 3) != 0) { int remnant = 0; int shift = 0; for (; i < address.Length; ++i) { remnant |= ((int)address[i]) << shift; shift += 8; } hash ^= remnant; } } return hash; } public override bool Equals(object comparand) { PhysicalAddress address = (PhysicalAddress) comparand; if (this.address.Length != address.address.Length) { return false; } for (int i = 0; i < address.address.Length; i++) { if(this.address[i] != address.address[i]) return false; } return true; } public override string ToString(){ StringBuilder addressString = new StringBuilder(); foreach (byte value in address ) { int tmp = (value >> 4) & 0x0F; for (int i = 0; i<2; i++) { if (tmp < 0x0A ) { addressString.Append((char)(tmp+0x30)); } else{ addressString.Append((char)(tmp+0x37)); } tmp = ((int)value & 0x0F); } } return addressString.ToString(); } public byte[] GetAddressBytes(){ byte[] tmp = new byte[address.Length]; Buffer.BlockCopy(address,0,tmp,0,address.Length); return tmp; } public static PhysicalAddress Parse(string address) { int validCount = 0; bool hasDashes = false; byte[] buffer = null; if(address == null) { return PhysicalAddress.None; } //has dashes? if (address.IndexOf('-') >= 0 ){ hasDashes = true; buffer = new byte[(address.Length+1)/3]; } else{ if(address.Length % 2 > 0){ //should be even throw new FormatException(SR.GetString(SR.net_bad_mac_address)); } buffer = new byte[address.Length/2]; } int j = 0; for (int i = 0; i < address.Length; i++ ) { int value = (int)address[i]; if (value >= 0x30 && value <=0x39){ value -= 0x30; } else if (value >= 0x41 && value <= 0x46) { value -= 0x37; } else if (value == (int)'-'){ if (validCount == 2) { validCount = 0; continue; } else{ throw new FormatException(SR.GetString(SR.net_bad_mac_address)); } } else{ throw new FormatException(SR.GetString(SR.net_bad_mac_address)); } //we had too many characters after the last dash if(hasDashes && validCount >= 2){ throw new FormatException(SR.GetString(SR.net_bad_mac_address)); } if (validCount%2 == 0) { buffer[j] = (byte) (value << 4); } else{ buffer[j++] |= (byte) value; } validCount++; } //we too few characters after the last dash if(validCount < 2){ throw new FormatException(SR.GetString(SR.net_bad_mac_address)); } return new PhysicalAddress(buffer); } } }
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