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Save data can get completely overridden if unserialization fails #3269

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EliteMasterEric opened this issue Oct 17, 2024 · 1 comment
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Save data can get completely overridden if unserialization fails #3269

EliteMasterEric opened this issue Oct 17, 2024 · 1 comment

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@EliteMasterEric
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flixel/flixel/util/FlxSave.hx

Lines 459 to 466 in f5087ea

try
{
final unserializer = new haxe.Unserializer(encodedData);
final resolver = { resolveEnum: Type.resolveEnum, resolveClass: SharedObject.__resolveClass };
unserializer.setResolver(cast resolver);
sharedObject.data = unserializer.unserialize();
}
catch (e:Dynamic) {}

Relevant issue: FunkinCrew/Funkin#3679

The v0.5.2 update for Funkin' introduced new properties to the user's save data. One of these properties was an Enum value, and as a result older versions of the game will fail to parse the save data.

In the case that save data fails to parse at this stage, sharedObject.data will remain null, and the game will act as though it is a fresh installation with no save data, and write to the save data file.

Without modifying this behavior, there is no chance for backup or recovery of the save data.
@EliteMasterEric EliteMasterEric mentioned this issue Oct 17, 2024
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@EliteMasterEric
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EliteMasterEric commented Oct 18, 2024 •
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Looking at the code for FlxSave more, there is an FlxSaveStatus.ERROR but this is not used if there is an unserialization error.

EDIT: It also ignores the haxe.Unserializer.DEFAULT_RESOLVER! I was trying to override that to fix behavior myself but apparently that's not an option!

@EliteMasterEric EliteMasterEric mentioned this issue Oct 18, 2024
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Implement error handling for save data unserialization. FunkinCrew/flixel
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@Geokureli @EliteMasterEric