Try using the inflate method as taken from the perldoc for Compress::Zlib.
There is a difference in how the headers are written which explains why the the second method is incompatible with gzip.

Note that for zip file manipulation, the docs suggest using Archive::Zip which I would guess is a reason for the default behaviour. I'm still looking into this, but maybe this will help?

#!/usr/bin/perl

use strict;
use warnings;

use Compress::Zlib;

  my $x = inflateInit()
    or die "Cannot create inflation stream";

  my $input = "";
  binmode STDIN;
  binmode STDOUT;

  my ($output, $status);
  while (read(STDIN, $input, 4096)) {
    ($output, $status) = $x->inflate(\$input);
    print $output if $status == Z_OK or $status == Z_STREAM_END;
    last if $status != Z_OK;
  }

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In reply to Re: Different compression behaviours with Compress::Zlib by lemming
in thread Different compression behaviours with Compress::Zlib by grinder

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