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.\" ========================================================================
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.IX Title "CGI::Compress::Gzip::FileHandle 3pm"
.TH CGI::Compress::Gzip::FileHandle 3pm "2022-06-09" "perl v5.34.0" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.SH "NAME"
CGI::Compress::Gzip::FileHandle \- CGI::Compress::Gzip helper package
.SH "LICENSE"
.IX Header "LICENSE"
Copyright 2006\-2007 Clotho Advanced Media, Inc., <cpan@clotho.com>
.PP
Copyright 2007\-2008 Chris Dolan <cdolan@cpan.org>
.PP
This library is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&   use CGI::Compress::Gzip;
\&  
\&   my $cgi = new CGI::Compress::Gzip;
\&   print $cgi\->header();
\&   print "<html> ...";
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This is intended for internal use only!  Use CGI::Compress::Gzip
instead.
.PP
This CGI::Compress::Gzip helper class subclasses IO::Zlib.  It is 
is needed to make sure that output is not compressed until the \s-1CGI\s0
header is emitted.  This filehandle delays the ignition of the zlib
filter until it sees the exact same header generated by
\&\fBCGI::Compress::Gzip::header()\fR pass through it's \s-1\fBWRITE\s0()\fR method.  If
you change the header before printing it, this class will throw an
exception.
.PP
This class holds one global variable representing the previous default
filehandle used before the gzip filter is put in place.  This
filehandle, usually \s-1STDOUT,\s0 is replaced after the gzip stream finishes
(which is usually when the \s-1CGI\s0 object goes out of scope and is
destroyed).
.SH "FUNCTIONS"
.IX Header "FUNCTIONS"
.IP "\s-1OPEN\s0" 4
.IX Item "OPEN"
Overrides IO::Zlib::OPEN.  This method doesn't actually do anything \*(--
it just stores it's arguments for a later call to \s-1SUPER::OPEN\s0 in
\&\s-1\fBWRITE\s0()\fR.  The reason is that we may not have seen the header yet, so
we don't yet know whether to compress output.
.IP "\s-1WRITE\s0 buffer, length, offset" 4
.IX Item "WRITE buffer, length, offset"
Emit the uncompressed header followed by the compressed body.
.IP "\s-1CLOSE\s0" 4
.IX Item "CLOSE"
Flush the compressed output.
.SH "AUTHOR"
.IX Header "AUTHOR"
Clotho Advanced Media, \fIcpan@clotho.com\fR
.PP
Primary developer: Chris Dolan