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Old January 10, 2020, 17:51   #16
eastwind
Apprentice
 
Join Date: Dec 2019
Location: Mexico, undisclosed location
Posts: 79
eastwind is on a distinguished road
A long time ago, in a galaxy far far away, I was able to successfully hex edit a save file for a game that might have been Angband, or Moria, or something else.

One of the things I recall was that the save file had a checksum built into it, so that if you edited a single value you needed to recalculate the checksum and modify that as well or the loader would puke on you. But I don't know if that was Angband or if that feature is still present.

Even further in the past, I remember a save file where I tried and tried to find the value I wanted to edit, to no avail, finally having to compare two save files made a turn apart where all I did was drop money (I think I was trying to hack myself some free money). The problem was about a dozen values changed in that one turn (timers and what not), and I had to go through those by process of elimination until I figured out where the field I needed to touch was.

And even then the hex value stored at the magic offset didn't make any sense. Until *finally* I twigged to the fact that the game had been written in Basic, and all the values were stored as floating point, because that's how numbers got represented internally in Basic. *And* of course the floating point values were stored byte-swapped (aka little endian).
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