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Dear colleagues, I'm using SharpZipLib to decode flate encoded streams within pdfs in C#.NET environment. The lib works great in most cases. However there is a minority of streams that cause exceptions of type: "System.FormatException: Header checksum illegal" that happens in Inflater.cs...

I've not (yet) looked at it in the depth that you have, but I am having the same issue on some streams. I know the code is otherwise working because a majority of the streams decode without error. Sorry, not much help at the moment, but I'll report back if I learn anything new.