Hi Serge,

What Pharo version are you on? What is your `file` object? If `file` is a FileReference, you need to know that by default, using `readStream` provides now an encoded file (to keep backwards compatibility with what most users were doing until now).

And I think that GZip should just decode/decompress binary data.

Instead of asking it for a readStream, try asking for a `binaryReadStream`.

compressed := file binaryReadStream.

stream := (GZipReadStream on: compressed) upToEnd asByteArray readStream.

Guille

On Thu, Jun 7, 2018 at 4:41 PM, Serge Stinckwich <serge.stinckwich@gmail.com> wrote:

I try to decompress a gzip file like that:

compressed := file readStream.
stream := (GZipReadStream on: compressed) upToEnd asByteArray readStream.

��but I have the following error:
Illegal leading byte for utf-8 encoding
��
--
Serge Stinckwich
UMI UMMISCO 209 (SU/IRD/UY1)
"Programs must be written for people to read, and only incidentally for machines to execute."
http://www.doesnotunderstand.org/

��	Guille Polito Research Engineer Centre de Recherche en Informatique, Signal et Automatique de Lille CRIStAL - UMR 9189 French National Center for Scientific Research - http://www.cnrs.fr Web: http://guillep.github.io Phone: +33 06 52 70 66 13