delphide BCD Stringi numaraya cevirme veya Numarayı BCD ye ceviren kod

Delphide
BCD Stringi numaraya cevirme veya Numarayı BCD ye ceviren kod

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function NumStringToBCD(const inStr: AnsiString): AnsiString;

  function Pack(ch1, ch2: AnsiChar): AnsiChar;
  begin
    Assert((ch1 >= '0') and (ch1 <= '9'));
    Assert((ch2 >= '0') and (ch2 <= '9'));
    { Ord('0') is $30, so we can just use the low nybble of the character
      as value. }
    result := AnsiChar((Ord(ch2) and $F) or ((Ord(ch1) and $F) shl 4))
  end;

var
  i: Integer;
begin
  if Odd(length(inStr)) then
    result := NumStringToBCD('0' + inStr)
  else
  begin
    SetLength(result, length(inStr) div 2);
    for i := 1 to length(result) do
      result[i] := Pack(inStr[2 * i - 1], inStr[2 * i]);
  end;
end;

// -------------------
function BCDToNumString(const inStr: AnsiString): AnsiString;

  procedure UnPack(Ch: AnsiChar; var ch1, ch2: AnsiChar);
  begin
    ch2 := AnsiChar((Ord(Ch) and $F) + $30);
    ch1 := AnsiChar(((Ord(Ch) shr 4) and $F) + $30);
    Assert((ch1 >= '0') and (ch1 <= '9'));
    Assert((ch2 >= '0') and (ch2 <= '9'));
  end;

var
  i: Integer;
begin
  SetLength(result, length(inStr) * 2);
  for i := 1 to length(inStr) do
    UnPack(inStr[i], result[2 * i - 1], result[2 * i]);
end;