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-   -   TPunyClass.Create (https://www.delphipraxis.net/172919-tpunyclass-create.html)

peberhardt 28. Jan 2013 21:30
Delphi-Version: 2007
TPunyClass.Create
 
hallo,

ich muss einen Domainnamen der einen umlaut enthält in den sogenannten Puny Code umwandeln.

ich habe auch eine .pas Datei dazu gefunden.

ich müsste im Aufruf etwas deklarieren, hab aber keine Ahnung.

So müsste ich die funktionen aufrufen:
Was mir fehlt, ist :

var
pc : ???????;

Delphi-Quellcode:
// Beispiel:
procedure TForm_XXXXClick(Sender: TObject);
var
pc : ???????;
begin
pc := TPunyClass.Create;
e := pc.Encode('müller'); // Verschlüsselt 'müller' zu 'mller-kva'
d := pc.Decode(e); // Entschlüsselt 'mller-kva' zu 'müller'
end;

pc.Free;
e und d wird wahrscheinlich string sein....

Hier die .pas datei, in der die Funktionen drin sind.:

Delphi-Quellcode:
unit puny;

interface

const
  BASE: Longint = 36;
  TMIN: Longint = 1;
  TMAX: Longint = 26;
  SKEW: Longint = 38;
  DAMP: Longint = 700;
  INITIAL_BIAS: Longint = 72;
  INITIAL_N: Longint = 128;
  Delimiter: WideString = '-';
  MAX_INT: Longint = 2147483647;

type TPunyClass = class
  private
    function GetMinCodePoint(const n: Longint; const data: WideString): Longint;
    function IsBasic(c: WideString; const n: Longint): Boolean;
    function Adapt(const delta, numpoints: Longint; const firsttime: Boolean): Longint;
    function Digit2Codepoint(const d: Longint): Longint;
    function Codepoint2Digit(const c: Longint): Longint;
    function UInt(i: Longint): Longint;
    function Asc(s: WideString): Longint;
    function AscW(s: WideString): Longint;
    function PosRev(sub, text: WideString): Longint;
  public
    function Encode(input: WideString): WideString;
    function Decode(input: WideString): WideString;
  end;

implementation

function TPunyClass.Encode(input: WideString): WideString;
var
  n, delta, bias, b, l, h, q, m, k, t: Longint;
  text, output, c: WideString;
  first: Boolean;

begin
  text := input;
  output := '';

  try
    n := INITIAL_N;
    bias := INITIAL_BIAS;
    b := 0;
   
    for l := 1 to Length(text) do
    begin
      c := Copy(text, l, 1);

      if IsBasic(c, INITIAL_N) = True then
      begin
        output := output + c;
        b := b + 1;
      end;
    end;

    if Length(output) < Length(text) then
      if Length(output) > 0 then output := output + Delimiter;

    h := b;
    delta := 0;
   
    while h < Length(text) do
    begin
      m := GetMinCodePoint(n, text);
      delta := delta + UInt(m - n) * (h + 1);

      n := m;

      for l := 1 to Length(text) do
      begin
        c := Copy(text, l, 1);
        if IsBasic(c, n) = True then delta := delta + 1
        else if UInt(AscW(c)) = n then
        begin
          q := delta;

          k := BASE;
          while k <= MAX_INT do
          begin
            if k <= (bias + TMIN) then t := TMIN
            else if k >= (bias + TMAX) then t := TMAX
            else t := k - bias;

            if q < t then break;

            output := output + Chr(Digit2Codepoint(t + ((q - t) Mod (BASE - t))));
            q := (q - t) div (BASE - t);

            k := k + BASE;
          end;

          output := output + Chr(Digit2Codepoint(q));
          first := False;
          if h = b then first := True;
          bias := Adapt(delta, h + 1, first);
          delta := 0;
          h := h + 1;
        end;
      end;
     
      delta := delta + 1;
      n := n + 1;
    end;
  except
    output := input;
  end;

  Result := output;
end;

function TPunyClass.Decode(input: WideString): WideString;
var
  n, i, bias, l, ps, oldi, w, k, t: Longint;
  digit: Byte;
  text, output, c: WideString;
  first: Boolean;

begin
  text := input;
  output := '';

  try
    n := INITIAL_N;
    bias := INITIAL_BIAS;
    i := 0;

    ps := PosRev(Delimiter, text);

    if ps > 0 then
    begin
      for l := 1 to (ps - 1) do
      begin
        c := Copy(text, l, 1);

        if IsBasic(c, INITIAL_N) = True then output := output + c
        else
        begin
          Result := '';
          Exit;
        end;
      end;
    end;

    ps := ps + 1;

    while ps <= Length(text) do
    begin
      oldi := i;
      w := 1;

      k := BASE;
      while ((k <= MAX_INT) and (ps <= Length(text))) do
      begin
        c := Copy(text, ps, 1);
        ps := ps + 1;

        digit := Codepoint2Digit(Asc(c));
        if ((digit >= BASE) or (digit > ((MAX_INT - i) / w))) then
        begin
          Result := '';
          Exit;
        end;

        i := i + digit * w;

        if k <= bias then t := TMIN
        else if k >= (bias + TMAX) then t := TMAX
        else t := k - bias;

        if digit < t then break;

        if w > (maxint / (base - t)) then
        begin
          Result := '';
          Exit;
        end;

        w := w * (BASE - t);

        k := k + BASE;
      end;

      first := False;
      if oldi = 0 then first := True;
      bias := Adapt(i - oldi, Length(output) + 1, first);

      if (i / (Length(output) + 1)) > (MAX_INT - n) then
      begin
        Result := '';
        Exit;
      end;

      n := n + i div (Length(output) + 1);
      i := i mod (Length(output) + 1);

      if IsBasic(WideChar(n), INITIAL_N) = True then
      begin
        Result := '';
        Exit;
      end;

      output := Copy(output, 1, i) + WideChar(n) + Copy(output, i + 1, Length(output) - (i + 1) + 1);
      i := i + 1;
    end;
  except
    output := input;
  end;

  Result := output;
end;

function TPunyClass.GetMinCodePoint(const n: Longint; const data: WideString): Longint;
var
  t, a, res: Longint;

begin
  res := 2147483647;

  for t := 1 to Length(data) do
  begin
    a := UInt(AscW(Copy(data, t, 1)));
    if ((a >= n) and (a < res)) then res := a;
  end;

  Result := res;
end;

function TPunyClass.IsBasic(c: WideString; const n: Longint): Boolean;
begin
  Result := False;
  if UInt(AscW(c)) < n then Result := True;
end;

function TPunyClass.Adapt(const delta, numpoints: Longint; const firsttime: Boolean): Longint;
var
  k, dt: Longint;

begin
  dt := delta;

  if firsttime = True then dt := dt div DAMP
  else dt := dt div 2;

  dt := dt + (dt div numpoints);
  k := 0;

  while dt > (((BASE - TMIN) * TMAX) div 2) do
  begin
    dt := dt div (BASE - TMIN);
    k := k + BASE;
  end;

  Result := k + (((BASE - TMIN + 1) * dt) div (dt + SKEW));
end;

function TPunyClass.Digit2Codepoint(const d: Longint): Longint;
begin
  Result := 0;
 
  if d < 26 then Result := d + 97
  else if d < 36 then Result := d - 26 + 48;
end;

function TPunyClass.Codepoint2Digit(const c: Longint): Longint;
begin
  Result := BASE;

  if (c - 48) < 10 then Result := c - 22
  else if (c - 65) < 26 then Result := c - 65
  else if (c - 97) < 26 then Result := c - 97;
end;

function TPunyClass.UInt(i: Longint): Longint;
begin
  Result := i;
  if i < 0 then Result := 65536 + i;
end;

function TPunyClass.Asc(s: WideString): Longint;
var
  c: WideChar;

begin
  Result := 0;

  if Length(s) > 0 then
  begin
    c := s[1];
    Result := Word(c);
  end;
end;

function TPunyClass.AscW(s: WideString): Longint;
var
  c: WideChar;

begin
  Result := 0;

  if Length(s) > 0 then
  begin
    c := s[1];
    Result := Longint(c);
  end;
end;

function TPunyClass.PosRev(sub, text: WideString): Longint;
var
  p: Longint;
  s: WideString;

begin
  Result := 0;

  s := '';
  for p := 1 to Length(text) do s := s + Copy(text, Length(text) - p + 1, 1);

  p := Pos(sub, s);
  if p > 0 then Result := Length(s) - p + 1;
end;

end.
besten dank für euere Hilfe
peberhardt

DeddyH 28. Jan 2013 21:49
AW: TPunyClass.Create
 
Wenn Du pc eine Instanz von TPunyClass zuweist, muss die Variable auch vom Typ TPunyClass (oder einem ihrer Vorfahren) sein. Deklarier sie also als TPunyClass, dann sollte es keine Probleme geben.
Delphi-Quellcode:
procedure TForm_XXXXClick(Sender: TObject);
var
  pc : TPunyClass;
begin
  pc := TPunyClass.Create;
  try
    e := pc.Encode('müller'); // Verschlüsselt 'müller' zu 'mller-kva'
    d := pc.Decode(e); // Entschlüsselt 'mller-kva' zu 'müller'
  finally
    pc.Free;
  end;
end;

dunningkruger 28. Jan 2013 22:44
AW: TPunyClass.Create
 
Delphi-Quellcode:
// Punycode Konvertierung
//
// Punycode: A Bootstring encoding of Unicode for Internationalized Domain Names in Applications (IDNA)
// http://www.rfc-editor.org/rfc/rfc3492.txt
//
// Delphi-Unit von Daniel Mitte (2005)
// Original-Code von http://www.activevb.de
//
// Beispiel:
// pc := TPunyClass.Create;
// e := pc.Encode('müller'); // Verschlüsselt 'müller' zu 'mller-kva'
// d := pc.Decode(e); // Entschlüsselt 'mller-kva' zu 'müller'
// pc.Free;

unit puny;

interface

const
  BASE: Longint = 36;
  TMIN: Longint = 1;
  TMAX: Longint = 26;
  SKEW: Longint = 38;
  DAMP: Longint = 700;
  INITIAL_BIAS: Longint = 72;
  INITIAL_N: Longint = 128;
  Delimiter: WideString = '-';
  MAX_INT: Longint = 2147483647;

type TPunyClass = class
  private
    function GetMinCodePoint(const n: Longint; const data: WideString): Longint;
    function IsBasic(c: WideString; const n: Longint): Boolean;
    function Adapt(const delta, numpoints: Longint; const firsttime: Boolean): Longint;
    function Digit2Codepoint(const d: Longint): Longint;
    function Codepoint2Digit(const c: Longint): Longint;
    function UInt(i: Longint): Longint;
    function Asc(s: WideString): Longint;
    function AscW(s: WideString): Longint;
    function PosRev(sub, text: WideString): Longint;
  public
    function Encode(input: WideString): WideString;
    function Decode(input: WideString): WideString;
  end;

implementation

function TPunyClass.Encode(input: WideString): WideString;
var
  n, delta, bias, b, l, h, q, m, k, t: Longint;
  text, output, c: WideString;
  first: Boolean;

begin
  text := input;
  output := '';

  try
    n := INITIAL_N;
    bias := INITIAL_BIAS;
    b := 0;
   
    for l := 1 to Length(text) do
    begin
      c := Copy(text, l, 1);

      if IsBasic(c, INITIAL_N) = True then
      begin
        output := output + c;
        b := b + 1;
      end;
    end;

    if Length(output) < Length(text) then
      if Length(output) > 0 then output := output + Delimiter;

    h := b;
    delta := 0;
   
    while h < Length(text) do
    begin
      m := GetMinCodePoint(n, text);
      delta := delta + UInt(m - n) * (h + 1);

      n := m;

      for l := 1 to Length(text) do
      begin
        c := Copy(text, l, 1);
        if IsBasic(c, n) = True then delta := delta + 1
        else if UInt(AscW(c)) = n then
        begin
          q := delta;

          k := BASE;
          while k <= MAX_INT do
          begin
            if k <= (bias + TMIN) then t := TMIN
            else if k >= (bias + TMAX) then t := TMAX
            else t := k - bias;

            if q < t then break;

            output := output + Chr(Digit2Codepoint(t + ((q - t) Mod (BASE - t))));
            q := (q - t) div (BASE - t);

            k := k + BASE;
          end;

          output := output + Chr(Digit2Codepoint(q));
          first := False;
          if h = b then first := True;
          bias := Adapt(delta, h + 1, first);
          delta := 0;
          h := h + 1;
        end;
      end;
     
      delta := delta + 1;
      n := n + 1;
    end;
  except
    output := input;
  end;

  Result := output;
end;

function TPunyClass.Decode(input: WideString): WideString;
var
  n, i, bias, l, ps, oldi, w, k, t: Longint;
  digit: Byte;
  text, output, c: WideString;
  first: Boolean;

begin
  text := input;
  output := '';

  try
    n := INITIAL_N;
    bias := INITIAL_BIAS;
    i := 0;

    ps := PosRev(Delimiter, text);

    if ps > 0 then
    begin
      for l := 1 to (ps - 1) do
      begin
        c := Copy(text, l, 1);

        if IsBasic(c, INITIAL_N) = True then output := output + c
        else
        begin
          Result := '';
          Exit;
        end;
      end;
    end;

    ps := ps + 1;

    while ps <= Length(text) do
    begin
      oldi := i;
      w := 1;

      k := BASE;
      while ((k <= MAX_INT) and (ps <= Length(text))) do
      begin
        c := Copy(text, ps, 1);
        ps := ps + 1;

        digit := Codepoint2Digit(Asc(c));
        if ((digit >= BASE) or (digit > ((MAX_INT - i) / w))) then
        begin
          Result := '';
          Exit;
        end;

        i := i + digit * w;

        if k <= bias then t := TMIN
        else if k >= (bias + TMAX) then t := TMAX
        else t := k - bias;

        if digit < t then break;

        if w > (maxint / (base - t)) then
        begin
          Result := '';
          Exit;
        end;

        w := w * (BASE - t);

        k := k + BASE;
      end;

      first := False;
      if oldi = 0 then first := True;
      bias := Adapt(i - oldi, Length(output) + 1, first);

      if (i / (Length(output) + 1)) > (MAX_INT - n) then
      begin
        Result := '';
        Exit;
      end;

      n := n + i div (Length(output) + 1);
      i := i mod (Length(output) + 1);

      if IsBasic(WideChar(n), INITIAL_N) = True then
      begin
        Result := '';
        Exit;
      end;

      output := Copy(output, 1, i) + WideChar(n) + Copy(output, i + 1, Length(output) - (i + 1) + 1);
      i := i + 1;
    end;
  except
    output := input;
  end;

  Result := output;
end;

function TPunyClass.GetMinCodePoint(const n: Longint; const data: WideString): Longint;
var
  t, a, res: Longint;

begin
  res := 2147483647;

  for t := 1 to Length(data) do
  begin
    a := UInt(AscW(Copy(data, t, 1)));
    if ((a >= n) and (a < res)) then res := a;
  end;

  Result := res;
end;

function TPunyClass.IsBasic(c: WideString; const n: Longint): Boolean;
begin
  Result := False;
  if UInt(AscW(c)) < n then Result := True;
end;

function TPunyClass.Adapt(const delta, numpoints: Longint; const firsttime: Boolean): Longint;
var
  k, dt: Longint;

begin
  dt := delta;

  if firsttime = True then dt := dt div DAMP
  else dt := dt div 2;

  dt := dt + (dt div numpoints);
  k := 0;

  while dt > (((BASE - TMIN) * TMAX) div 2) do
  begin
    dt := dt div (BASE - TMIN);
    k := k + BASE;
  end;

  Result := k + (((BASE - TMIN + 1) * dt) div (dt + SKEW));
end;

function TPunyClass.Digit2Codepoint(const d: Longint): Longint;
begin
  Result := 0;
 
  if d < 26 then Result := d + 97
  else if d < 36 then Result := d - 26 + 48;
end;

function TPunyClass.Codepoint2Digit(const c: Longint): Longint;
begin
  Result := BASE;

  if (c - 48) < 10 then Result := c - 22
  else if (c - 65) < 26 then Result := c - 65
  else if (c - 97) < 26 then Result := c - 97;
end;

function TPunyClass.UInt(i: Longint): Longint;
begin
  Result := i;
  if i < 0 then Result := 65536 + i;
end;

function TPunyClass.Asc(s: WideString): Longint;
var
  c: WideChar;

begin
  Result := 0;

  if Length(s) > 0 then
  begin
    c := s[1];
    Result := Word(c);
  end;
end;

function TPunyClass.AscW(s: WideString): Longint;
var
  c: WideChar;

begin
  Result := 0;

  if Length(s) > 0 then
  begin
    c := s[1];
    Result := Longint(c);
  end;
end;

function TPunyClass.PosRev(sub, text: WideString): Longint;
var
  p: Longint;
  s: WideString;

begin
  Result := 0;

  s := '';
  for p := 1 to Length(text) do s := s + Copy(text, Length(text) - p + 1, 1);

  p := Pos(sub, s);
  if p > 0 then Result := Length(s) - p + 1;
end;

end.

DeddyH 29. Jan 2013 09:16
AW: TPunyClass.Create
 
Ich habe mir mal ein paar Änderungen erlaubt (allerdings ungetestet). Man könnte noch ein wenig mehr machen, aber das war mir zuviel Aufwand ;)
Delphi-Quellcode:
// Punycode Konvertierung
//
// Punycode: A Bootstring encoding of Unicode for Internationalized Domain Names in Applications (IDNA)
// http://www.rfc-editor.org/rfc/rfc3492.txt
//
// Delphi-Unit von Daniel Mitte (2005)
// Original-Code von http://www.activevb.de
//
// Beispiel:
// pc := TPunyClass.Create;
// e := pc.Encode('müller'); // Verschlüsselt 'müller' zu 'mller-kva'
// d := pc.Decode(e); // Entschlüsselt 'mller-kva' zu 'müller'
// pc.Free;

unit puny;

interface

const
  BASE: Longint = 36;
  TMIN: Longint = 1;
  TMAX: Longint = 26;
  SKEW: Longint = 38;
  DAMP: Longint = 700;
  INITIAL_BIAS: Longint = 72;
  INITIAL_N: Longint = 128;
  Delimiter: WideString = '-';
  MAX_INT: Longint = $7FFFFFFF; //= MAXINT

type TPunyClass = class
  private
    function GetMinCodePoint(const n: Longint; const data: WideString): Longint;
    function IsBasic(c: WideString; const n: Longint): Boolean;
    function Adapt(const delta, numpoints: Longint; const firsttime: Boolean): Longint;
    function Digit2Codepoint(const d: Longint): Longint;
    function Codepoint2Digit(const c: Longint): Longint;
    function UInt(i: Longint): Longint;
    function Asc(s: WideString): Longint;
    function AscW(s: WideString): Longint;
    function PosRev(sub, text: WideString): Longint;
  public
    function Encode(input: WideString): WideString;
    function Decode(input: WideString): WideString;
  end;

implementation

function TPunyClass.Encode(input: WideString): WideString;
var
  n, delta, bias, b, l, h, q, m, k, t: Longint;
  text, output, c: WideString;
  first: Boolean;

begin
  text := input;
  output := '';

  try
    n := INITIAL_N;
    bias := INITIAL_BIAS;
    b := 0;
   
    for l := 1 to Length(text) do
    begin
      //c := Copy(text, l, 1);
      c := text[l];

      if IsBasic(c, INITIAL_N) then
      begin
        output := output + c;
        b := b + 1;
      end;
    end;

    if Length(output) < Length(text) then
      if Length(output) > 0 then output := output + Delimiter;

    h := b;
    delta := 0;
   
    while h < Length(text) do
    begin
      m := GetMinCodePoint(n, text);
      delta := delta + UInt(m - n) * (h + 1);

      n := m;

      for l := 1 to Length(text) do
      begin
        c := text[l];
        if IsBasic(c, n) then delta := delta + 1
        else if UInt(AscW(c)) = n then
        begin
          q := delta;

          k := BASE;
          while k <= MAX_INT do
          begin
            if k <= (bias + TMIN) then t := TMIN
            else if k >= (bias + TMAX) then t := TMAX
            else t := k - bias;

            if q < t then break;

            output := output + Chr(Digit2Codepoint(t + ((q - t) Mod (BASE - t))));
            q := (q - t) div (BASE - t);

            k := k + BASE;
          end;

          output := output + Chr(Digit2Codepoint(q));
          first := h = b;        
          bias := Adapt(delta, h + 1, first);
          delta := 0;
          h := h + 1;
        end;
      end;
     
      delta := delta + 1;
      n := n + 1;
    end;
  except
    output := input;
  end;

  Result := output;
end;

function TPunyClass.Decode(input: WideString): WideString;
var
  n, i, bias, l, ps, oldi, w, k, t: Longint;
  digit: Byte;
  text, output, c: WideString;
  first: Boolean;

begin
  text := input;
  output := '';

  try
    n := INITIAL_N;
    bias := INITIAL_BIAS;
    i := 0;

    ps := PosRev(Delimiter, text);

    if ps > 0 then
    begin
      for l := 1 to (ps - 1) do
      begin
        c := text[l];

        if IsBasic(c, INITIAL_N) then output := output + c
        else
        begin
          Result := '';
          Exit;
        end;
      end;
    end;

    ps := ps + 1;

    while ps <= Length(text) do
    begin
      oldi := i;
      w := 1;

      k := BASE;
      while ((k <= MAX_INT) and (ps <= Length(text))) do
      begin
        c := text[ps];
        ps := ps + 1;

        digit := Codepoint2Digit(Asc(c));
        if ((digit >= BASE) or (digit > ((MAX_INT - i) / w))) then
        begin
          Result := '';
          Exit;
        end;

        i := i + digit * w;

        if k <= bias then t := TMIN
        else if k >= (bias + TMAX) then t := TMAX
        else t := k - bias;

        if digit < t then break;

        if w > (maxint / (base - t)) then
        begin
          Result := '';
          Exit;
        end;

        w := w * (BASE - t);

        k := k + BASE;
      end;

      first := oldi = 0;
      bias := Adapt(i - oldi, Length(output) + 1, first);

      if (i / (Length(output) + 1)) > (MAX_INT - n) then
      begin
        Result := '';
        Exit;
      end;

      n := n + i div (Length(output) + 1);
      i := i mod (Length(output) + 1);

      if IsBasic(WideChar(n), INITIAL_N) then
      begin
        Result := '';
        Exit;
      end;

      output := Copy(output, 1, i) + WideChar(n) + Copy(output, i + 1, Length(output) - (i + 1) + 1);
      i := i + 1;
    end;
  except
    output := input;
  end;

  Result := output;
end;

function TPunyClass.GetMinCodePoint(const n: Longint; const data: WideString): Longint;
var
  t, a, res: Longint;

begin
  res := MAX_INT;

  for t := 1 to Length(data) do
  begin
    a := UInt(AscW(Copy(data, t, 1)));
    if ((a >= n) and (a < res)) then res := a;
  end;

  Result := res;
end;

function TPunyClass.IsBasic(c: WideString; const n: Longint): Boolean;
begin
  Result := UInt(AscW(c)) < n;
end;

function TPunyClass.Adapt(const delta, numpoints: Longint; const firsttime: Boolean): Longint;
var
  k, dt: Longint;

begin
  dt := delta;

  if firsttime then dt := dt div DAMP
  else dt := dt div 2;

  dt := dt + (dt div numpoints);
  k := 0;

  while dt > (((BASE - TMIN) * TMAX) div 2) do
  begin
    dt := dt div (BASE - TMIN);
    k := k + BASE;
  end;

  Result := k + (((BASE - TMIN + 1) * dt) div (dt + SKEW));
end;

function TPunyClass.Digit2Codepoint(const d: Longint): Longint;
begin
  Result := 0;
 
  if d < 26 then Result := d + 97
  else if d < 36 then Result := d - 26 + 48;
end;

function TPunyClass.Codepoint2Digit(const c: Longint): Longint;
begin
  Result := BASE;

  if (c - 48) < 10 then Result := c - 22
  else if (c - 65) < 26 then Result := c - 65
  else if (c - 97) < 26 then Result := c - 97;
end;

function TPunyClass.UInt(i: Longint): Longint;
begin
  Result := i;
  if i < 0 then Result := 65536 + i;
end;

function TPunyClass.Asc(s: WideString): Longint;
var
  c: WideChar;

begin
  Result := 0;

  if Length(s) > 0 then
  begin
    c := s[1];
    Result := Word(c);
  end;
end;

function TPunyClass.AscW(s: WideString): Longint;
var
  c: WideChar;

begin
  Result := 0;

  if s <> '' then
  begin
    c := s[1];
    Result := Longint(c);
  end;
end;

function TPunyClass.PosRev(sub, text: WideString): Longint;
var
  p: Longint;
  s: WideString;

begin
  Result := 0;

  s := '';
  for p := 1 to Length(text) do s := s + Copy(text, Length(text) - p + 1, 1);

  p := Pos(sub, s);
  if p > 0 then Result := Length(s) - p + 1;
end;

end.


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