GZIP Analysis without actually Compressing

[jtb612]

Is there a way to analyze a file or a file system, reporting on compression
details (similar to gzip --list) without actually compressing the content? 
I'd like to be able to some analysis on a large amount of unstructured data
and ultimately produce a report by file type of compression capabilities. 
I'd like to do this without changing anything initially within the file
system.

Thanks!
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