Bug #66163 for Archive-Zip:

Fri Feb 25 05:51:17 2011 DETI [...] cpan.org - Ticket created

Is there a way to know the size of the final zip file?

When I want to send the zip to a browser via

$zip->writeToFileHandle( 'STDOUT' );

I need to send a HTTP header before. In that header I want to put the Content-length. That is the reason why I need to know the size before I write it to STDOUT.

Fri Feb 25 05:55:23 2011 DETI [...] cpan.org - Status changed from 'new' to 'open'

Sat Feb 26 07:44:18 2011 DETI [...] cpan.org - Correspondence added

Subject:

How to get the size of the final zip before writing it?

I wrote a ugly workaround for now, but I would appreciate a better implemented solution. Thanks!

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# Open an anonymous temporary filehandle

open( my $MEMORY, "+>", undef ) || die "Can not open anonymous temporary file: $!";
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# write zip in anonymous temporary filehandle $MEMORY

$zip->writeToFileHandle( $MEMORY );

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# print http header

print $CGI_Simple->header(
-type => 'application/octet-stream',
-attachment => 'my_zip.zip',
-Content_length => tell $MEMORY, # get size of zip out of anonymous temporary filehandle $MEMORY
-expires => 'now',
);

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# print zip to STDOUT

seek( $MEMORY, 0, 0 );
print <$MEMORY>;
close( $MEMORY );

Thu Mar 10 09:50:25 2011 nedkonz [...] cpan.org - Correspondence added

Subject:

re: knowing the size of zip files for HTTP transfer

On Fri Feb 25 05:51:17 2011, DETI wrote: Show quoted text

> Is there a way to know the size of the final zip file? > > When I want to send the zip to a browser via > > $zip->writeToFileHandle( 'STDOUT' ); > > I need to send a HTTP header before. In that header I want to put the > Content-length. That is the reason why I need to know the size before > I write > it to STDOUT.

Can't you use chunked encoding (see http://www.w3.org/Protocols/rfc2616/rfc2616-sec3.html#sec3.6)?

Fri Mar 11 06:54:27 2011 DETI [...] cpan.org - Correspondence added

Subject:

Re: How to get the size of the final zip before writing it?

On Thu Mar 10 09:50:25 2011, NEDKONZ wrote:
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> Can't you use chunked encoding (see
> http://www.w3.org/Protocols/rfc2616/rfc2616-sec3.html#sec3.6)?

I can't see how. Even with "Transfer-Encoding: chunked" you need to know the size of each (!) chunk in advance. See example in
http://en.wikipedia.org/wiki/Chunked_transfer_encoding#Example