Zlib: how to have a header and compressed data

Hello

I have some data that I can compress into a file with Zlib.
Now, I'd like to have a header for this file that describes the data.
Since the header information depends on the data, it means the header
will need to be written in the file later on.

How is it possible to write this block of data at the begin of the file
with zlib ?

Paul D.

.

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