$status = $i->inflateSync($input) ;
    $i->dict_adler() ;
    $d->crc32() ;
    $d->adler32() ;
    $i->total_in() ;
    $i->total_out() ;
    $i->msg() ;
    $d->get_BufSize();

    $dest = compress($source) ;
    $dest = uncompress($source) ;

    $gz = gzopen($filename or filehandle, $mode) ;
    $bytesread = $gz->gzread($buffer [,$size]) ;
    $bytesread = $gz->gzreadline($line) ;
    $byteswritten = $gz->gzwrite($buffer) ;
    $status = $gz->gzflush($flush) ;
    $offset = $gz->gztell() ;
    $status = $gz->gzseek($offset, $whence) ;
    $status = $gz->gzclose() ;
    $status = $gz->gzeof() ;
    $status = $gz->gzsetparams($level, $strategy) ;
    $errstring = $gz->gzerror() ; 
    $gzerrno

    $dest = Compress::Zlib::memGzip($buffer) ;
    $dest = Compress::Zlib::memGunzip($buffer) ;

    $crc = adler32($buffer [,$crc]) ;
    $crc = crc32($buffer [,$crc]) ;

    $crc = adler32_combine($crc1, $crc2, $len2)l
    $crc = crc32_combine($adler1, $adler2, $len2)

    ZLIB_VERSION
    ZLIB_VERNUM

=head1 DESCRIPTION

The I<Compress::Zlib> module provides a Perl interface to the I<zlib>
compression library (see L</AUTHOR> for details about where to get
I<zlib>). 

The C<Compress::Zlib> module can be split into two general areas of
functionality, namely a simple read/write interface to I<gzip> files
and a low-level in-memory compression/decompression interface.

Each of these areas will be discussed in the following sections.

=head2 Notes for users of Compress::Zlib version 1

The main change in C<Compress::Zlib> version 2.x is that it does not now
interface directly to the zlib library. Instead it uses the
C<IO::Compress::Gzip> and C<IO::Uncompress::Gunzip> modules for
reading/writing gzip files, and the C<Compress::Raw::Zlib> module for some
low-level zlib access. 

The interface provided by version 2 of this module should be 100% backward
compatible with version 1. If you find a difference in the expected
behaviour please contact the author (See L</AUTHOR>). See L<GZIP INTERFACE> 

With the creation of the C<IO::Compress> and C<IO::Uncompress> modules no
new features are planned for C<Compress::Zlib> - the new modules do
everything that C<Compress::Zlib> does and then some. Development on
C<Compress::Zlib> will be limited to bug fixes only.

If you are writing new code, your first port of call should be one of the
new C<IO::Compress> or C<IO::Uncompress> modules.

=head1 GZIP INTERFACE

A number of functions are supplied in I<zlib> for reading and writing
I<gzip> files that conform to RFC 1952. This module provides an interface
to most of them. 

If you have previously used C<Compress::Zlib> 1.x, the following
enhancements/changes have been made to the C<gzopen> interface:

=over 5

=item 1

If you want to to open either STDIN or STDOUT with C<gzopen>, you can now
optionally use the special filename "C<->" as a synonym for C<\*STDIN> and
C<\*STDOUT>.

=item 2 

In C<Compress::Zlib> version 1.x, C<gzopen> used the zlib library to open
the underlying file. This made things especially tricky when a Perl
filehandle was passed to C<gzopen>. Behind the scenes the numeric C file
descriptor had to be extracted from the Perl filehandle and this passed to
the zlib library.

Apart from being non-portable to some operating systems, this made it
difficult to use C<gzopen> in situations where you wanted to extract/create
a gzip data stream that is embedded in a larger file, without having to
resort to opening and closing the file multiple times. 

It also made it impossible to pass a perl filehandle that wasn't associated