Conversion of (hex bin oct) to each other

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Description

Convert Text Instead of Numbers

in this example i convert a big value witch the calculator can not do
here i changed the rule of conversion, instead of converting a big type such as int64 or cardinal... i convert the string characters and i rarly use numbers.

Source / Exemple :


unit Main;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  StdCtrls, StrUtils, MathUtils;

type
  TForm1 = class(TForm)
    Edit1: TEdit;
    Edit2: TEdit;
    GroupBox1: TGroupBox;
    ComboBox1: TComboBox;
    ComboBox2: TComboBox;
    Label1: TLabel;
    Label2: TLabel;
    procedure Edit1KeyDown(Sender: TObject; var Key: Word;
      Shift: TShiftState);
    procedure Edit1KeyPress(Sender: TObject; var Key: Char);
    procedure FormCreate(Sender: TObject);
    procedure ComboBox1Change(Sender: TObject);
  private
    { Déclarations privées }
  public
    { Déclarations publiques }
    FirstNum : Boolean;
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

procedure TForm1.Edit1KeyDown(Sender: TObject; var Key: Word;
  Shift: TShiftState);
begin
  if Key = 46 then
    Begin
      FirstNum := True;
      Edit1.Text := '0';
      Edit2.Text := '0';
    End;
end;

procedure TForm1.Edit1KeyPress(Sender: TObject; var Key: Char);
begin
  if FirstNum then
    Begin
      Case ComboBox1.ItemIndex of
        0 : if Key in ['0'..'7'] then Edit1.Text := Key
              else
                beep;
        1 : if Key in ['0'..'1'] then Edit1.Text := Key
              Else
                Beep;
        2 : if Key in ['0'..'9', 'A'..'F'] then Edit1.Text := Key
              Else
                Beep;
      End;
    End
      Else

      Case ComboBox1.ItemIndex of
        0 : if Key in ['0'..'7'] then Edit1.Text := Edit1.Text + Key
              Else
                Beep;
        1 : if Key in ['0'..'1'] then Edit1.Text := Edit1.Text + Key
              Else
                Beep;
        2 : if Key in ['0'..'9', 'A'..'F'] then Edit1.Text := Edit1.Text + Key
              Else
                Beep;
      End;

      Case ComboBox1.ItemIndex of
        0 : if Key in ['0'..'7'] then FirstNum := False;
        1 : if Key in ['0'..'1'] then FirstNum := False;
        2 : if Key in ['0'..'9', 'A'..'F'] then FirstNum := False;
      End;

  // Here we choose witch way of conversion should be..
  Case ComboBox1.ItemIndex of
    0 : Case ComboBox2.ItemIndex of
          1 : Edit2.Text := OctToBin(Edit1.Text);
          2 : Edit2.Text := OctToHex(Edit1.Text);
        End;

    1 : Case ComboBox2.ItemIndex of
          0 : Edit2.Text := BinToOct(Edit1.Text);
          2 : Edit2.Text := BinToHex(Edit1.Text);
        End;

    2 : Case ComboBox2.ItemIndex of
          0 : Edit2.Text := HexToOct(Edit1.Text);
          1 : Edit2.Text := HexToBin(Edit1.Text);
        End;
  End;

  if ComboBox1.ItemIndex = ComboBox2.ItemIndex then
     Edit2.Text := Edit1.Text;
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
  FirstNum := True;
  ComboBox1.ItemIndex := 0;
  ComboBox2.ItemIndex := 2;
end;

procedure TForm1.ComboBox1Change(Sender: TObject);
begin
  FirstNum := True;
  Edit1.Text := '0';
  Edit2.Text := '0';
end;

end.

unit MathUtils;

interface
  Uses
    SysUtils, StrUtils;

  function Bin(X : Word) : Integer;
  Function BinToOther(S : String) : BYTE;
  function BinToOct(S : String) : String;
  function BinToHex(S : String) : String;
  function Order(C : Char) : Integer;
  function OneHexToBin(C : Char) : String;
  function HexToBin(S : String) : String;
  function OneOctToBin(C : Char) : String;
  function OctToBin(S : String) : String;
  function HexToOct(S : String) : String;
  function OctToHex(S : String) : String;

  {OctToHex
   HexToOct
   OctToBin
   HexToBin
   BinToHex
   BinToOct}

implementation

Const
  H : Array[0..15] of Char = ('0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F');

function Bin(X : Word) : Integer;
Var
  I : Integer;
begin
  Result := 0;
  for I := 0 to X do
    begin
      Result := Result + Result;
      if I = 1 then Result := 1;
    end;
end;

Function BinToOther(S : String) : BYTE;
Var
  I : BYTE;
begin
  Result := 0;
  for I := Length(S) DownTo 1 do
    if S[I] = '1' then Result := Result + Bin(Length(S) + 1 - I);
end;

function BinToOct(S : String) : String;
Var
  Text : TText;
  I    : Integer;
begin
  Result := '';
  DivideText(S, Text, 3);
  for I := 0 to High(Text) do
    Result := Result + IntToStr(BinToOther(Text[I]));

  TurnOver(Result);
end;

function BinToHex(S : String) : String;
Var
  Text : TText;
  I    : Integer;
begin
  Result := '';
  DivideText(S, Text, 4);
  for I := 0 to High(Text) do
    Result := Result + H[BinToOther(Text[I])];

  TurnOver(Result);
end;

function Order(C : Char) : Integer;
begin
  for Result := 0 to High(H) do
    if C = H[Result] then Break;
  if not (Result in [0..15]) then Result := -1;
end;

function OneHexToBin(C : Char) : String;
Var
  V, I : Integer;
begin
  V      := Order(C);
  Result := '';
  for I := 4 DownTo 1 do
    if V >= Bin(I) then
      Begin
        Result := Result + '1';
        Dec(V, Bin(I));
      End
        Else
          Result := Result + '0';
end;

function HexToBin(S : String) : String;
Var
  I : Integer;
begin
  Result := '';
  for I := 1 To Length(S) do
    Result := Result + OneHexToBin(S[I]);

  for I := 1 to Length(Result) do
    if Result[I] = '1' then
      Begin
        Delete(Result, 1, I - 1);
        Break;
      End;
end;

function OneOctToBin(C : Char) : String;
Var
  V, I : Integer;
begin
  V      := Order(C);
  Result := '';
  for I := 3 DownTo 1 do
    if V >= Bin(I) then
      Begin
        Result := Result + '1';
        Dec(V, Bin(I));
      End
        Else
          Result := Result + '0';
end;

function OctToBin(S : String) : String;
Var
  I : Integer;
begin
  Result := '';
  for I := 1 To Length(S) do
    Result := Result + OneOctToBin(S[I]);

  for I := 1 to Length(Result) do
    if Result[I] = '1' then
      Begin
        Delete(Result, 1, I - 1);
        Break;
      End;
end;

function HexToOct(S : String) : String;
begin
  Result := BinToOct(HexToBin(S));
end;

function OctToHex(S : String) : String;
begin
  Result := BinToHex(OctToBin(S));
end;

end.

unit StrUtils;

interface

  TYPE
    TText = Array of String;

  procedure ExChange(Var C1, C2 : Char);
  procedure TurnOver(Var S : String);
  function  RCopy(Source : String; Index, Count : Integer) : String;
  procedure RCopyDef(Source : String; Var Dest : String; Count, Index : Integer;
                      DefaultChar : Char = '0');
  procedure DivideText(Source : String; Var Text : TText; Len : Integer);

implementation

procedure ExChange(Var C1, C2 : Char);
Var
  C3 : Char;
begin
  C3 := C1;
  C1 := C2;
  C2 := C3;
end;

procedure TurnOver(Var S : String);
Var
  I : Integer;
begin
  for I := 1  to Length(S) Div 2 do
    ExChange(S[I], S[Length(S) - I + 1]);
end;

function RCopy(Source : String; Index, Count : Integer) : String;
begin
  TurnOver(Source);
  Result := Copy(Source, Index, Count);
  TurnOver(Result);
end;

procedure RCopyDef(Source : String; Var Dest : String; Count, Index : Integer;
                      DefaultChar : Char = '0');
begin
  Dest := RCopy(Source, Index, Count);
  Dest := StringOfChar(DefaultChar, Count - Length(Dest)) + Dest;
end;

procedure DivideText(Source : String; Var Text : TText; Len : Integer);
Var
  Index : Integer;
begin
  SetLength(Text, 0);
  Index := 1;

  While Index <= Length(Source) do
    Begin
      SetLength(Text, Length(Text) + 1);
      RCopyDef(Source, Text[High(Text)], Len, Index);
      Inc(Index, Len);
    End;
end;

end.

Conclusion :


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