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#!/usr/bin/perl
eval 'exec /usr/bin/perl -S $0 ${1+"$@"}'
if 0; # ^ Run only under a shell
#!/usr/bin/perl
# Streaming zip
use strict;
use warnings;
use IO::Compress::Zip qw(zip
ZIP_CM_STORE
ZIP_CM_DEFLATE
ZIP_CM_BZIP2 ) ;
use Getopt::Long;
my $VERSION = '1.00';
my $compression_method = ZIP_CM_DEFLATE;
my $stream = 0;
my $zipfile = '-';
my $memberName = '-' ;
my $zip64 = 0 ;
my $level ;
GetOptions("zip64" => \$zip64,
"method=s" => \&lookupMethod,
"0" => sub { $level = 0 },
"1" => sub { $level = 1 },
"2" => sub { $level = 2 },
"3" => sub { $level = 3 },
"4" => sub { $level = 4 },
"5" => sub { $level = 5 },
"6" => sub { $level = 6 },
"7" => sub { $level = 7 },
"8" => sub { $level = 8 },
"9" => sub { $level = 9 },
"stream" => \$stream,
"zipfile=s" => \$zipfile,
"member-name=s" => \$memberName,
'version' => sub { print "$VERSION\n"; exit 0 },
'help' => \&Usage,
)
or Usage();
Usage()
if @ARGV;
my @extraOpts = ();
if ($compression_method == ZIP_CM_DEFLATE && defined $level)
{
push @extraOpts, (Level => $level)
}
# force streaming zip file when writing to stdout.
$stream = 1
if $zipfile eq '-';
zip '-' => $zipfile,
Name => $memberName,
Zip64 => $zip64,
Method => $compression_method,
Stream => $stream,
@extraOpts
or die "Error creating zip file '$zipfile': $\n" ;
exit 0;
sub lookupMethod
{
my $name = shift;
my $value = shift ;
my %valid = ( store => ZIP_CM_STORE,
deflate => ZIP_CM_DEFLATE,
bzip2 => ZIP_CM_BZIP2,
lzma => 14,
xz => 95,
zstd => 93,
);
my $method = $valid{ lc $value };
Usage("Unknown method '$value'")
if ! defined $method;
installModule("Lzma")
if $method == 14 ;
installModule("Xz")
if $method == 95 ;
installModule("Zstd")
if $method == 93;
$compression_method = $method;
}
sub installModule
{
my $name = shift ;
eval " use IO::Compress::$name; use IO::Compress::Adapter::$name ; " ;
die "Method '$name' needs IO::Compress::$name\n"
if $@;
}
sub Usage
{
print <, compress it into a zip container
and, by default, write a I zip file to C. No temporary
files are created.
The zip container written to C is, by necessity, written in
streaming format. Most programs that read Zip files can cope with a
streamed zip file, but if interoperability is important, and your workflow
allows you to write the zip file directly to disk you can create a
non-streamed zip file using the C option.
=head2 OPTIONS
=over 5
=item -zip64
Create a Zip64-compliant zip container. Use this option if the input is
greater than 4Gig.
Default is disabled.
=item -zipfile=F
Write zip container to the filename C.
Use the C option to force the creation of a streamed zip file.
=item -member-name=M
This option is used to name the "file" in the zip container.
Default is '-'.
=item -stream
Ignored when writing to C.
If the C option is specified, including this option will trigger
the creation of a streamed zip file.
Default: Always enabled when writing to C, otherwise disabled.
=item -method=M
Compress using method C.
Valid method names are
* store Store without compression
* deflate Use Deflate compression [Deflault]
* bzip2 Use Bzip2 compression
* lzma Use LZMA compression
* xz Use xz compression
* zstd Use Zstandard compression
Note that Lzma compress needs C to be installed.
Note that Zstd compress needs C to be installed.
Default is C.
=item -0, -1, -2, -3, -4, -5, -6, -7, -8, -9
Sets the compression level for C. Ignored for all other compression methods.
C<-0> means no compression and C<-9> for maximum compression.
Default is 6
=item -version
Display version number
=item -help
Display help
=back
=head2 Examples
Create a zip file bt reading daa from stdin
$ echo Lorem ipsum dolor sit | perl ./bin/streamzip >abcd.zip
Check the contents of C with the standard C utility
Archive: abcd.zip
Length Date Time Name
--------- ---------- ----- ----
22 2021-01-08 19:45 -
--------- -------
22 1 file
Notice how the C is set to C<->.
That is the default for a few zip utilities whwre the member name is not given.
If you want to explicitly name the file, use the C<-member-name> option as follows
$ echo Lorem ipsum dolor sit | perl ./bin/streamzip -member-name latin >abcd.zip
$ unzip -l abcd.zip
Archive: abcd.zip
Length Date Time Name
--------- ---------- ----- ----
22 2021-01-08 19:47 latin
--------- -------
22 1 file
=head2 When to write a Streamed Zip File
A Streamed Zip File is useful in situations where you cannot seek
backwards/forwards in the file.
A good examples is when you are serving dynamic content from a Web Server
straight into a socket without needing to create a temporary zip file in
the filesystsm.
Similarly if your workfow uses a Linux pipelined commands.
=head1 SUPPORT
General feedback/questions/bug reports should be sent to
L (preferred) or
L.
=head1 AUTHOR
Paul Marquess F.
=head1 COPYRIGHT
Copyright (c) 2019-2024 Paul Marquess. All rights reserved.
This program is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.