Узнать/установить JPG resolution?

procedure GetResJpg(JPGFile: string);
const
 BufferSize = 50;
var
 Buffer: string;
 Index: integer;
 FileStream: TFileStream;
 HorzRes, VertRes: Word;
 DP: Byte;
 Measure: string;
begin
 FileStream := TFileStream.Create(JPGFile,
  fmOpenReadWrite);
 try
  SetLength(Buffer, BufferSize);
  FileStream.Read(buffer[1], BufferSize);
  Index := Pos('JFIF' + #$00, buffer);
  if Index > 0 then
  begin
  FileStream.Seek(Index + 6, soFromBeginning);
  FileStream.Read(DP, 1);
  case DP of
  1: Measure := 'DPI'; //Dots Per Inch
  2: Measure := 'DPC'; //Dots Per Cm.
  end;
  FileStream.Read(HorzRes, 2); // x axis
  HorzRes := Swap(HorzRes);
  FileStream.Read(VertRes, 2); // y axis
  VertRes := Swap(VertRes);
  end
 finally
  FileStream.Free;
 end;
end;
procedure SetResJpg(name: string; dpix, dpiy: Integer);
const
 BufferSize = 50;
 DPI = 1; //inch
 DPC = 2; //cm
var
 Buffer: string;
 index: INTEGER;
 FileStream: TFileStream;
 xResolution: WORD;
 yResolution: WORD;
 _type: Byte;
begin
 FileStream := TFileStream.Create(name,
  fmOpenReadWrite);
 try
  SetLength(Buffer, BufferSize);
  FileStream.Read(buffer[1], BufferSize);
  index := POS('JFIF' + #$00, buffer);
  if index > 0
  then begin
  FileStream.Seek(index + 6, soFromBeginning);
  _type := DPI;
  FileStream.write(_type, 1);
  xresolution := swap(dpix);
  FileStream.write(xresolution, 2);
  yresolution := swap(dpiy);
  FileStream.write(yresolution, 2);
  end
 finally
  FileStream.Free;
 end;
end;

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