added 'text:' image format specifier

[l4yton]

No description provided.

[allanlw]

That's insane! Awesome, thank you!

There's a typo in your example, but this one worked for me with convert test.svg test.png:

<svg width="800" height="800">
  <image width="800" height="800" href="text:/etc/passwd"/>
</svg>

I guess I put a note at the top that says:

All of these methods specify a URI, which can be absolute or relative. File and HTTP protocol are important to test, but it could also support other protocols depending on the implementation (e.g. PHP stream schemes), including javascript: and data:.

But perhaps it'd be better to have a section for schemes like this, especially because ImageMagick seems much more relevant than PHP stuff.

[l4yton]

I guess putting the note on top would make sense, but I'm not sure about having an extra section for this. I've only found text: to be a useful scheme in exploitation and being SVG/ImageMagick specific. If there are more, I guess it would make sense though.