PhysicalAddress.cs source code in C# .NET

Source code for the .NET framework in C#

                        
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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