Add "pngs" command

[slaugaus]

Completes #21, kinda.
Here's my scuffed generic algorithm that pulls everything PNG-ish out of an arbitrary set of bytes. Unfortunately I'm a little too stupid to integrate it with the EXE or XEX parsers, but it will get all the PNGS out of an extracted EXE, plus 2 garbage files.

It looks like jeff EXEs also have filenames for the achievements/gamerpics that I'm not parsing:

strings gh2.exe | grep png

.png
_spec.png
_norm.png
%s/pngquant_r.exe -platform %s -rndcache "%s"
game.png
coop_perfectscore.png
coop_8x.png
coop_500streak.png
coop_100streak.png
coop1000streak.png
coop_1mil.png
coop_800k.png
coop_600k.png
coop_400k.png
coop_200k.png
win_tutorials.png
win_thunder_trogdor.png
win_no_encore.png
win_medium_5stars.png
win_medium.png
win_leftyflip.png
win_hard_5stars.png
win_hard.png
win_expert_5stars.png
win_expert.png
win_easy_5stars.png
win_easy.png
win_buckethead.png
watch_credits.png
venue_theater.png
venue_stonehenge.png
venue_small2.png
venue_small1.png
venue_fest.png
venue_bigclub.png
venue_arena.png
unlock_bonus_chars.png
streak_perfect.png
streak_8x.png
streak_500.png
streak_1000.png
streak_100.png
spend_10k.png
practice_3_songs.png
fail_song_easy.png
buy_all_songs.png
buy_all_guitar_skins.png
buy_all_guitars.png
buy_all_char_skins.png
beat_all_unlocks.png
500k.png
400k.png
300k.png
200k.png
100k.pngXSRC

[rjkiv]

This is a solid start, nice work so far!

I was thinking this would be a subcommand of xex, so xex pngs . In order to actually parse the xex and obtain the relevant info, you'd use process_xex (see cmd/xex.rs for uses of it). That'll return an ObjInfo for you. From there, you can get the .reloc section, and parse that specific section's data for PNGs.