Hangs on gunzipSync of compressed content with invalid dictionary about fflate HOT 3 CLOSED

For future reference, dictionaries are just treated as a prefix to an existing data source. When you compress some source data with a dictionary, you can think of it as compressing the dictionary concatenated with the source and extracting the bytes that correspond to just the source. A corrupt dictionary provided during decompression can never cause fflate to throw an error, but will cause it to return invalid data.

And to your question, extending (adding a suffix to) a dictionary is basically guaranteed to corrupt it. You can add a prefix to a dictionary with no ill effect, but it won't change how decompression works.

from fflate.

🤦 of course it was my code hanging on the now corrupt string.

I'll close this, I assume extending dictionaries will never be possible.

from fflate.

Oh a prefix, great idea 👍
Thanks!

from fflate.