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function HexStrToStream(AHexStr: String;AStream: TStream):Boolean;
var
iLen: Integer;
Buff: String;
P1,P2: PChar;
B: Byte;
begin
Result := False;
if Not Assigned(AStream) then Exit;
iLen := Length(AHexStr);
if iLen = 0 then Exit;
if (iLen mod 2) <> 0 then Exit;
SetString(Buff,Nil,iLen div 2);
P1 := PChar(AHexStr);
P2 := PChar(Buff);
while iLen > 0 do begin
if P1^ in ['0'..'9'] then
B := Ord(P1^) - Ord('0')
else if P1^ in ['A'..'F'] then
B := Ord(P1^) - Ord('A') + 10
else if P1^ in ['a','f'] then
B := Ord(P1^) - Ord('a') + 10
else
Exit;
B := B shl 4;
Inc(P1);
Dec(iLen);
if P1^ in ['0'..'9'] then
B := B + Ord(P1^) - Ord('0')
else if P1^ in ['A'..'F'] then
B := B + Ord(P1^) - Ord('A') + 10
else if P1^ in ['a','f'] then
B := B + Ord(P1^) - Ord('a') + 10
else
Exit;
Inc(P1);
Dec(iLen);
P2^ := Chr(B);
Inc(P2);
end;
AStream.WriteBuffer(PChar(Buff)^, Length(Buff));
Result := True;
end;
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