BinConvertor

unit BinConvertor;

interface

function BinToInt(value: string): Integer;
function IntToBin(value: Longint; digits: Integer): string; overload;
function IntToBin(value: Longint): string; overload;

implementation

function BinToInt(value: string): Integer;
var
  i, len: Integer;
begin
  Result := 0;
  len := Length(value);
  for i := len downto 1 do begin
    if value[i] = '1' then Result := Result + (1 shl (len - i));
  end;
end;

function IntToBin(value: Longint; digits: Integer): string; overload;
var
  i: Integer;
begin
  Result := '';
  for i := Digits - 1 downto 0 do
  begin
    if value and (1 shl i) <> 0 then
      Result := Result + '1'
    else Result := Result + '0';
  end;
end;

function IntToBin(value: Longint): string; overload;
var
  i: Integer;
  bin: string;
begin
  bin := '';
  for i := 1 to 8 * SizeOf(value) do
  begin
    if Odd(value) then bin := '1' + bin
    else bin := '0' + bin;
    value := value shr 1;
  end;
  Delete(bin, 1, 8 * ((Pos('1', bin) - 1) div 8));
  Result := bin;
end;

end.