Get icon dimensions if size not provided in filename or size attribute

[scottwernervt]

ico and apple-touch-icon-precomposed files have a width and height of 0. Investigate methods to partially download the image and parse the width and height from the data stream.

References

• https://stackoverflow.com/questions/7460218/get-image-size-without-downloading-it-in-python
• https://stackoverflow.com/questions/15800704/get-image-size-without-loading-image-into-memory