[sldev] Cache politics: performance vs obfuscation

[Jason Giglio]

Argent Stonecutter wrote:
> There is no optimization necessary, because there's no codec, and  
> miminal overhead: it's a straight copy and a tight "XOR" loop. Even  
> simple RLL encoding is more overhead.

If we are going to use stupid and ineffective token measures to
obfuscate, then we shouldn't waste time XORing the entire file.

Pre-pending the NUL character, ASCII 0, onto the beginning of file will
prevent it from being recognized as valid by pretty much everything.

I tested it, it works.  Nothing could open a jpg that I prepended ASCII
0 onto the beginning of.

-Jason
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