CODEWITHSUNDEEP
linuxpngasciifile-conversion
cyn
cyn

Reputation: 11

Is it possible to fix PNG files corrupted by ASCII conversion?

I've accidentally downloaded PNG images as ASCII files. The original files are already deleted so I have now only the downloaded files. Is it possible to fix PNG files corrupted by ASCII conversion?

Upvotes: 1

Views: 8551

Answers (2)

Qgenerator
Qgenerator

Reputation: 323

Generally there are too many permutations, for example if 3974 bytes have been replaced it'll take 2^3974 attempts to work out the image. It's much better to look for a similar image online and do a fuzzy comparison pctf.

Upvotes: 0

leonbloy
leonbloy

Reputation: 75946

It depends. What kind of convertion was done? ( \r\n -> \n ? or the reverse?). If the image is really small, there is some probability of successful recovery but blindly doing the reverse convertion. See eg fixgz. Otherwise you should try all the alternatives, which can be a lot. The fact that PNG is structured in fixed length chunk can help, but it would take some work.

Upvotes: 2

Related Questions