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TPunyClass.Create

Ein Thema von peberhardt · begonnen am 28. Jan 2013 · letzter Beitrag vom 29. Jan 2013
Antwort Antwort
peberhardt

Registriert seit: 14. Jun 2011
11 Beiträge
 
#1

TPunyClass.Create

  Alt 28. Jan 2013, 21:30
Delphi-Version: 2007
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 : ???????;

zusammenfalten · markieren
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.:

zusammenfalten · markieren
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
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Benutzerbild von DeddyH
DeddyH

Registriert seit: 17. Sep 2006
Ort: Barchfeld
27.626 Beiträge
 
Delphi 12 Athens
 
#2

AW: TPunyClass.Create

  Alt 28. Jan 2013, 21:49
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.
zusammenfalten · markieren
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;
Detlef
"Ich habe Angst vor dem Tag, an dem die Technologie unsere menschlichen Interaktionen übertrumpft. Die Welt wird eine Generation von Idioten bekommen." (Albert Einstein)
Dieser Tag ist längst gekommen
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dunningkruger

Registriert seit: 25. Mai 2012
59 Beiträge
 
#3

AW: TPunyClass.Create

  Alt 28. Jan 2013, 22:44
zusammenfalten · markieren
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.
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Benutzerbild von DeddyH
DeddyH

Registriert seit: 17. Sep 2006
Ort: Barchfeld
27.626 Beiträge
 
Delphi 12 Athens
 
#4

AW: TPunyClass.Create

  Alt 29. Jan 2013, 09:16
Ich habe mir mal ein paar Änderungen erlaubt (allerdings ungetestet). Man könnte noch ein wenig mehr machen, aber das war mir zuviel Aufwand
zusammenfalten · markieren
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.
Detlef
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