def _update_dimensions()

in src/google/appengine/api/images/__init__.py [0:0]

• 35 lines of code
• 23 McCabe index (conditional complexity)

  def _update_dimensions(self):
    """Updates the `width` and `height` fields of the image.

    Raises:
      NotImageError: If the image data is not an image.
      BadImageError: If the image data is corrupt.
    """
    if not self._image_data:
      raise NotImageError("Dimensions unavailable for blob key input")
    size = len(self._image_data)
    if size >= 6 and self._image_data.startswith(b"GIF"):
      self._update_gif_dimensions()
      self._format = GIF
    elif size >= 8 and self._image_data.startswith(b"\x89PNG\x0D\x0A\x1A\x0A"):
      self._update_png_dimensions()
      self._format = PNG
    elif size >= 2 and self._image_data.startswith(b"\xff\xD8"):
      self._update_jpeg_dimensions()
      self._format = JPEG
    elif (size >= 8 and (self._image_data.startswith(b"II\x2a\x00") or
                         self._image_data.startswith(b"MM\x00\x2a"))):
      self._update_tiff_dimensions()
      self._format = TIFF
    elif size >= 2 and self._image_data.startswith(b"BM"):
      self._update_bmp_dimensions()
      self._format = BMP
    elif size >= 4 and self._image_data.startswith(b"\x00\x00\x01\x00"):
      self._update_ico_dimensions()
      self._format = ICO
    elif (size >= 16 and (self._image_data.startswith(b"RIFF", 0, 4) and
                          self._image_data.startswith(b"WEBP", 8, 12) and
                          self._image_data.startswith(b"VP8 ", 12, 16))):
      self._update_webp_dimensions()
      self._format = WEBP

    elif (size >= 16 and (self._image_data.startswith(b"RIFF", 0, 4) and
                          self._image_data.startswith(b"WEBP", 8, 12) and
                          self._image_data.startswith(b"VP8X", 12, 16))):
      self._update_webp_vp8x_dimensions()
      self._format = WEBP
    else:
      raise NotImageError("Unrecognized image format")