Add bruteforce script, got clear image & valid hqx

[h5vx]

Good news, everyone!

I wrote cool hqx bruteforce script and found 12 correct hqx inputs, but only 3 of them decoding to valid JPEG image. Sadly, binhex have only 2 bytes for CRC checksum, so there is many collisions. At least now we can filter for valid candidates

What have been done

1. Mark important JPEG sections and add line numbers on rotated scan 2
2. Fix innocent.jpg.hqx code (mostly scandata) in live-reloading environment => got clear image
3. Add bruteforce script and it's self-documenting config file
4. Add 3 valid hqx that produces valid jpeg

Result

TODO

• We need to completely fix that jpg, we still have bad white blocks. That means corrupted scandata section (all that comes after SOS)
  • Specify all unclear symbols in bruteforce config
  • Bruteforce and find valid jpegs
• Start working with first scan (GIF image?)

How to setup live-reloading environment

Using entr and sxiv, you can setup live environment and instantly see image changes while editing binhex

Following instructions is for linux, I don't know how to do that on windows (should be easy, I guess)

1. Use following command to automatically update JPEG when innocent.jpg.hqx is changed

   echo raw_files/innocent.jpg.hqx | entr -sr "scripts/decode.py raw_files/innocent.jpg.hqx raw_files/innocent.corrupted.jpg"

2. Open the image via sxiv, it will reload image automatically. Optionally, you can run it in while loop, so if sxiv fails to open image, it will still trying to open it. In sxiv, set gamma to -30 by pressing { key to see bad blocks.

   while true; do sxiv raw_files/innocent.corrupted.jpg -z 300 -G -30 -b; done

3. If you use vim, I recommend to use autosave plugin

[mutr]

So we have not only one image but many!?