1: 2: 3: 4: 5: 6: 7: 8: 9: 10: 11: 12: 13: 14: 15: 16: 17: 18: 19: 20: 21: 22: 23: 24: 25: 26: 27: 28: 29: 30: 31: 32: 33: 34: 35: 36: 37: 38: 39: 40: 41: 42: 43: 44: 45: 46: 47: 48: 49: 50: 51: 52: 53: 54: 55: 56: 57: 58: 59: 60: 61: 62: 63: 64: 65: 66: 67: 68: 69: 70: 71: 72: 73: 74: 75: 76: 77: 78: 79: 80: 81: 82: 83: 84: 85: 86: 87: 88: 89: 90: 91: 92: 93: 94: 95: 96: 97: 98: 99: 100: 101: 102: 103: 104: 105: 106: 107: 108: 109: 110: 111: 112: 113: 114: 115: 116: 117: 118: 119: 120: 121: 122: 123: 124: 125: 126: 127: 128: 129: 130: 131: 132: 133: 134: 135: 136: 137: 138: 139: 140: 141: 142: 143: 144: 145: 146: 147: 148: 149: 150: 151: 152: 153: 154: 155: 156: 157: 158: 159: 160: 161: 162: 163: 164: 165: 166: 167: 168: 169: 170: 171: 172: 173: 174: 175: 176: 177: 178: 179: 180: 181: 182: 183: 184: 185: 186: 187: 188: 189: 190: 191: 192: 193: 194: 195: 196: 197: 198: 199: 200: 201: 202: 203: 204: 205: 206: 207: 208: 209: 210: 211: 212: 213: 214: 215: 216: 217: 218: 219: 220: 221: 222: 223: 224: 225: 226: 227: 228: 229: 230: 231: 232: 233: 234: 235: 236: 237: 238: 239: 240: 241: 242: 243: 244: 245: 246: 247: 248: 249: 250: 251: 252: 253: 254: 255: 256: 257: 258: 259: 260: 261: 262: 263: 264: 265: 266: 267: 268: 269: 270: 271: 272: 273: 274: 275: 276: 277: 278: 279: 280: 281: 282: 283: 284: 285: 286: 287: 288: 289: 290: 291: 292: 293: 294: 295: 296: 297: 298: 299: 300: 301: 302: 303: 304: 305: 306: 307: 308: 309: 310: 311: 312: 313: 314: 315: 316: 317: 318: 319: 320: 321: 322: 323:
| unit ds_ip;
interface
const MAX_OCTETS = 4;
type TOctetNumber = 1..MAX_OCTETS;
TBitNumber = 1..8; TBitNumberEx = 0..MAX_OCTETS * High(TBitNumber);
TIPv4AddressClass = (acA, acB, acC, acD, acE, acNone); TUseableIPv4AddressClass = (uacA, uacB, uacC, uacNone);
const acMulticast = acD; acExperimental = acE;
type TCustomIPv4Address = class protected FOctets: Array[TOctetNumber] of Byte; FBits: Array[TOctetNumber, 1..High(TBitNumber)] of Boolean; function GetOctet(OctetNr: TOctetNumber): Byte; procedure SetOctet(OctetNr: TOctetNumber; AValue: Byte); function GetIP: Cardinal; procedure SetIP(AValue: Cardinal); virtual; function GetBit(OctetNr: TOctetNumber; BitNr: TBitNumber): Boolean; overload; function GetBit(BitNr: TBitNumberEx): Boolean; overload; public property IP: Cardinal read GetIP write SetIP; property Octets[OctectNr: TOctetNumber]: Byte read GetOctet write SetOctet; function ToString: String; function ToBinaryString: String; end;
TIPv4Address = class(TCustomIPv4Address) public constructor Create; function GetClass: TIPv4AddressClass; function IsPrivate: Boolean; function IsLoopback: Boolean; end;
TIPv4SubnetMask = class(TCustomIPv4Address) protected FAddressClass: TUseableIPv4AddressClass; FBorrowedBits: TBitNumberEx; procedure SetAddressClass(AValue: TUseableIPv4AddressClass); procedure SetIP(AValue: Cardinal); override; procedure SetBorrowedBits(AValue: TBitNumberEx); public constructor Create; property AddressClass: TUseableIPv4AddressClass read FAddressClass write SetAddressClass; function IsValid(var ZeroStart: TBitNumberEx): Boolean; overload; function IsValid: Boolean; overload; property BitsBorrowed: TBitNumberEx read FBorrowedBits write SetBorrowedBits; end;
TIPv4SubnetHelper = class private FSubnetMask: TIPv4SubnetMask; public constructor Create; destructor Destroy; override; property SubnetMask: TIPv4SubnetMask read FSubnetMask write FSubnetMask; function GetNetworkPortion(AnAddress: Cardinal): Cardinal; overload; function GetNetworkPortion(AnAddress: TIPv4Address): TIPv4Address; overload; function GetHostPortion(AnAddress: Cardinal): Cardinal; overload; function GetHostPortion(AnAddress: TIPv4Address): TIPv4Address; overload; end;
implementation
function TCustomIPv4Address.GetOctet(OctetNr: TOctetNumber): Byte; begin Result := FOctets[OctetNr]; end;
procedure TCustomIPv4Address.SetOctet(OctetNr: TOctetNumber; AValue: Byte); var i: TBitNumber; pos: Byte; begin FOctets[OctetNr] := AValue; pos := High(TBitNumber); for i := pos downto 1 do begin FBits[OctetNr, i] := ((AValue mod 2) = 1); AValue := AValue shr 1; if AValue = 0 then begin pos := i - 1; break; end; end; for i := 1 to pos do FBits[OctetNr, i] := false; end;
function TCustomIPv4Address.GetIP: Cardinal; begin Result := (FOctets[1] shl 24) or (FOctets[2] shl 16) or (FOctets[3] shl 8) or FOctets[4]; end;
procedure TCustomIPv4Address.SetIP(AValue: Cardinal); begin SetOctet(1, AValue shr 24); SetOctet(2, ((AValue and $00FF0000) shr 16)); SetOctet(3, ((AValue and $0000FF00) shr 8)); SetOctet(4, AValue); end;
function TCustomIPv4Address.ToString: String; var i: TOctetNumber; temp: String; begin Result := ''; for i := 1 to MAX_OCTETS do begin Str(FOctets[i], temp); Result := Result + temp + '.'; end; SetLength(Result, Length(Result) - 1); end;
function TCustomIPv4Address.ToBinaryString: String; var i: TBitNumberEx; begin Result := ''; for i := 1 to High(TBitNumberEx) do begin if GetBit(i) then Result := Result + '1' else Result := Result + '0'; if (i mod High(TBitNumber) = 0) and not (i = High(TBitNumberEx)) then Result := Result + '.'; end; end;
function TCustomIPv4Address.GetBit(OctetNr: TOctetNumber; BitNr: TBitNumber): Boolean; begin Result := FBits[OctetNr, BitNr]; end;
function TCustomIPv4Address.GetBit(BitNr: TBitNumberEx): Boolean; begin Result := GetBit(BitNr div High(TBitNumber) + 1, BitNr mod High(TBitNumber)); end;
constructor TIPv4Address.Create; begin SetOctet(1, 192); SetOctet(2, 168); SetOctet(3, 0); SetOctet(4, 1); end;
function TIPv4Address.GetClass: TIPv4AddressClass; begin case FOctets[1] of 1..127: Result := acA; 128..191: Result := acB; 192..223: Result := acC; 224..239: Result := acD; 240..255: Result := acE; else Result := acNone; end; end;
function TIPv4Address.IsPrivate: Boolean; begin Result := false; if (FOctets[1] = 10) then Result := true; if (FOctets[1] = 172) and ((FOctets[2] >= 16) and (FOctets[2] <= 31)) then Result := true; if (FOctets[1] = 192) and (FOctets[2] = 168) then Result := true; end;
function TIPv4Address.IsLoopback: Boolean; begin Result := (FOctets[1] = 127); end;
constructor TIPv4SubnetMask.Create; begin inherited; SetOctet(1, 255); SetOctet(2, 255); SetOctet(3, 255); SetOctet(4, 0); FBorrowedBits := 0; end;
procedure TIPv4SubnetMask.SetAddressClass(AValue: TUseableIPv4AddressClass); var i, SubnetOctetIndex: TOctetNumber; begin FAddressClass := AValue; if AValue <> uacNone then begin SubnetOctetIndex := Ord(AValue) + 1; for i := 1 to SubnetOctetIndex do SetOctet(i, 255); for i := SubnetOctetIndex + 1 to MAX_OCTETS do SetOctet(i, 0); end; FBorrowedBits := 0; end;
procedure TIPv4SubnetMask.SetIP(AValue: Cardinal); var helper: TIPv4SubnetMask; zerostart: TBitNumberEx;
procedure SaveIP; var i: TOctetNumber; begin for i := 1 to MAX_OCTETS do helper.SetOctet(i, FOctets[i]); end;
procedure RestoreIP; var i: TOctetNumber; begin for i := 1 to MAX_OCTETS do SetOctet(i, helper.GetOctet(i)); end;
begin helper := TIPv4SubnetMask.Create; SaveIP; inherited; if not IsValid(zerostart) then begin RestoreIP; helper.Free; exit; end; helper.Free; SetAddressClass(uacNone); end;
function TIPv4SubnetMask.IsValid(var ZeroStart: TBitNumberEx): Boolean; var i: TBitNumberEx; begin Result := false; ZeroStart := High(TBitNumberEx); if not GetBit(1) then exit; for i := Low(TBitNumberEx) to High(TBitNumberEx) do begin if not GetBit(i) then begin ZeroStart := i + 1; break; end; end; if ZeroStart = (High(TBitNumberEx) + 1) then exit; for i := ZeroStart to High(TBitNumberEx) do begin if GetBit(i) then exit; end; Result := true; end;
function TIPv4SubnetMask.IsValid: Boolean; var temp: TBitNumberEx; begin Result := IsValid(temp); end;
procedure TIPv4SubnetMask.SetBorrowedBits(AValue: TBitNumberEx); const HostBits: Array[TUseableIPv4AddressClass] of TBitNumberEx = (24, 16, 8, 0); begin FBorrowedBits := AValue; end;
constructor TIPv4SubnetHelper.Create; begin FSubnetMask := TIPv4SubnetMask.Create; end;
destructor TIPv4SubnetHelper.Destroy; begin FSubnetMask.Free; end;
function TIPv4SubnetHelper.GetNetworkPortion(AnAddress: Cardinal): Cardinal; begin Result := AnAddress and FSubnetMask.IP; end;
function TIPv4SubnetHelper.GetNetworkPortion(AnAddress: TIPv4Address): TIPv4Address; begin Result := TIPv4Address.Create; Result.IP := GetNetworkPortion(AnAddress.IP); end;
function TIPv4SubnetHelper.GetHostPortion(AnAddress: Cardinal): Cardinal; begin Result := AnAddress and not FSubnetMask.IP; end;
function TIPv4SubnetHelper.GetHostPortion(AnAddress: TIPv4Address): TIPv4Address; begin Result := TIPv4Address.Create; Result.IP := GetHostPortion(AnAddress.IP); end;
end. |