Mastodawn

nivs

@nivrig

992 Followers

317 Following

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Real Programmer with screwdriver. Born to nerd. Respawned 80s game developer. Tech, games, cycling, sci-fi and old computers. Contents may unsettle.

Web	https://nivrig.com
itch.io	https://nivrig.itch.io
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Links	https://links.nivrig.com

nivs 1d ago

All hands marketing update for an hour.

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nivs 1d ago

Here is the offender.

writename re-terminates the input string and leaves 2 bytes of whatever is in memory to be written to the file. The save CRC is calculated with these bytes.

readname ignores those 2 bytes and terminates the string with 0. The load CRC is calculated with 0s.

nivs 2d ago

Spent all evening on a gnarly bug. Loaded levels would fail CRC after being saved once.

Eventually, with a hex editor, I figured out a string writer wasn’t writing the null terminator bytes the CRC was calculated with but whatever was in memory, and the string reader was ignoring those and always “reading” nulls. So the load CRC was seeing different data from the save CRC.