TIFF_HDR_SIZE     594 modules/dng.c      raw_offset = TIFF_HDR_SIZE;
TIFF_HDR_SIZE     620 modules/dng.c      get_tag(IFD_0, SUBIFDS_TAG)->offset = TIFF_HDR_SIZE + ifd_list[0].count * 12 + 6;                            // SubIFDs offset
TIFF_HDR_SIZE     621 modules/dng.c      get_tag(IFD_0, EXIF_IFD_TAG)->offset = TIFF_HDR_SIZE + (ifd_list[0].count + ifd_list[1].count) * 12 + 6 + 6; // EXIF IFD offset
TIFF_HDR_SIZE     623 modules/dng.c          get_tag(IFD_0, GPS_IFD_TAG)->offset = TIFF_HDR_SIZE + (ifd_list[0].count + ifd_list[1].count + ifd_list[2].count) * 12 + 6 + 6 + 6;  // GPS IFD offset
TIFF_HDR_SIZE     628 modules/dng.c      extra_offset=TIFF_HDR_SIZE;
TIFF_HDR_SIZE     634 modules/dng.c      add_val_to_buf(TIFF_HDR_SIZE, sizeof(int)); // offset of first IFD