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Editing: streamzip

#!/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 = '1.002';

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)
}

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 <<EOM;
Usage:
  producer | streamzip [OPTIONS] | consumer
  producer | streamzip [OPTIONS] -zipfile output.zip

Stream data from stdin, compress into a Zip container, and stream to stdout.

OPTIONS

-zipfile=F      Write zip container to the filename 'F'
                  Outputs to stdout if zipfile not specified.
  -member-name=M  Set member name to 'M' [Default '-']
  -0 ... -9       Set compression level for Deflate
                  [Default: 6]
  -zip64          Create a Zip64-compliant zip file [Default: No]
                  Enable Zip64 if input is greater than 4Gig.
  -stream         Force a streamed zip file when 'zipfile' option is also enabled.
                  Only applies when 'zipfile' option is used. [Default: No]
                  Stream is always enabled when writing to stdout.
  -method=M       Compress using method 'M'.
                  Valid methods are
                    store    Store without compression
                    deflate  Use Deflate compression [Deflault]
                    bzip2    Use Bzip2 compression
                    lzma     Use LZMA compression [needs IO::Compress::Lzma]
                    xz       Use LZMA compression [needs IO::Compress::Xz]
                    zstd     Use LZMA compression [needs IO::Compress::Zstd]
  -version        Display version number [$VERSION]

This program is free software; you can redistribute it and/or
modify it under the same terms as Perl itself.

EOM
    exit;
}

__END__
=head1 NAME

streamzip - create a zip file from stdin

=head1 SYNOPSIS

producer | streamzip [opts] | consumer
    producer | streamzip [opts] -zipfile=output.zip

=head1 DESCRIPTION

This program will read data from C<stdin>, compress it into a zip container
and, by default, write a I<streamed> zip file to C<stdout>. No temporary
files are created.

The zip container written to C<stdout> 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<zipfile> 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<F>.

Use the C<Stream> 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<stdout>.

If the C<zipfile> option is specified, including this option will trigger
the creation of a streamed zip file.

Default: Always enabled when writing to C<stdout>, otherwise disabled.

=item  -method=M

Compress using method C<M>.

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<IO::Compress::Lzma> to be installed.

Note that Zstd compress needs C<IO::Compress::Zstd> to be installed.

Default is C<deflate>.

=item -0, -1, -2, -3, -4, -5, -6, -7, -8, -9

Sets the compression level for C<deflate>. 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<abcd,zip> with the standard C<unzip> utility

Archive:  abcd.zip
      Length      Date    Time    Name
    ---------  ---------- -----   ----
           22  2021-01-08 19:45   -
    ---------                     -------
           22                     1 file

Notice how the C<Name> 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<https://github.com/pmqs/IO-Compress/issues> (preferred) or
L<https://rt.cpan.org/Public/Dist/Display.html?Name=IO-Compress>.

=head1 AUTHOR

Paul Marquess F<pmqs@cpan.org>.

=head1 COPYRIGHT

This program is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.

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