Adventures do not decode in this tool.
PNGs containing Adventures will have extra data in a separate chunk of the PNG. As far as I know, this decoder does not look for this extra data, and so it fails to decode the PNG (gzip decompression fails, due to unexpected end of file - because the proper "end of file" is located in this extra data).
The C# (.NET Core) decoder does have this feature, it can be used as a reference - see GetSporeSection, starting on line 142.
Note that the resulting XML file is not readable, and must be passed through a separate decoder to obtain adventure data. Here is an Adventure Decoder, written in Java.
Adventures do not decode in this tool.
PNGs containing Adventures will have extra data in a separate chunk of the PNG. As far as I know, this decoder does not look for this extra data, and so it fails to decode the PNG (gzip decompression fails, due to unexpected end of file - because the proper "end of file" is located in this extra data).
The C# (.NET Core) decoder does have this feature, it can be used as a reference - see GetSporeSection, starting on line 142.
Note that the resulting XML file is not readable, and must be passed through a separate decoder to obtain adventure data. Here is an Adventure Decoder, written in Java.