bookmist
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 Posted: Sun Sep 30, 2007 16:32 Post subject: |
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В тегах binary содержание закодировано в base64. Есть как компоненты для работы с ним (ЕМНИП indy), так и просто коротенькие процедуры кодирования и декодирования. Процедура, которой пользуюсь я (Delphi):
| Code: |
function DecodeBase64(const CinLine: string): string;
const
RESULT_ERROR = -2;
var
inLineIndex: Integer;
c: Char;
x: SmallInt;
c4: Word;
StoredC4: array[0..3] of SmallInt;
InLineLength: Integer;
begin
Result := '';
inLineIndex := 1;
c4 := 0;
InLineLength := Length(CinLine);
while inLineIndex <= InLineLength do
begin
while (inLineIndex <= InLineLength) and (c4 < 4) do
begin
c := CinLine[inLineIndex];
case c of
'+' : x := 62;
'/' : x := 63;
'0'..'9': x := Ord(c) - (Ord('0')-52);
'=' : x := -1;
'A'..'Z': x := Ord(c) - Ord('A');
'a'..'z': x := Ord(c) - (Ord('a')-26);
else
x := RESULT_ERROR;
end;
if x <> RESULT_ERROR then
begin
StoredC4[c4] := x;
Inc(c4);
end;
Inc(inLineIndex);
end;
if c4 = 4 then
begin
c4 := 0;
Result := Result + Char((StoredC4[0] shl 2) or (StoredC4[1] shr 4));
if StoredC4[2] = -1 then Exit;
Result := Result + Char((StoredC4[1] shl 4) or (StoredC4[2] shr 2));
if StoredC4[3] = -1 then Exit;
Result := Result + Char((StoredC4[2] shl 6) or (StoredC4[3]));
end;
end;
end;
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