The Perl Toolchain Summit needs more sponsors. If your company depends on Perl, please support this very important event.
 / 
Archive-Zip-SimpleZip-0.022
River stage zero No dependents
1 ++
/ Archive::Zip::SimpleUnzip

NAME

Archive::Zip::SimpleUnzip - Read Zip Archives

SYNOPSIS

    use Archive::Zip::SimpleUnzip qw($SimpleUnzipError) ;

    my $z = new Archive::Zip::SimpleUnzip "my.zip"
        or die "Cannot open zip file: $SimpleUnzipError\n" ;

    # How many members in the archive?
    my $members = scalar $z->names();

    # Get the names of all the members in a zip archive
    my @names = $z->names();

    # test member existence
    if ($z->exists("abc.txt"))
    {
     ...
    }
    
    # read the zip comment
    my $comment = $zip->comment();

    # open a member by name
    my $member = $z->member("abc.txt");
    my $name = $member->name();
    my $content = $member->content();
    my $comment = $member->comment();

    # Iterate through a zip archive
    while (my $member = $z->next)
    {
        print $member->name() . "\n" ;
    }

    # Archive::Zip::SimpleUnzip::Member

    # open a filehandle to read from a zip member
    $fh = $member->open("mydata1.txt");

    # read blocks of data
    read($fh, $buffer, 1234) ;

    # or a line at a time
    $line = <$fh> ;

    close $fh;

    $z->close();

DESCRIPTION

Archive::Zip::SimpleUnzip is a module that allows reading of Zip archives. For writing Zip archives, there is a companion module, called Archive::Zip::SimpleZip, that can create Zip archives.

NOTE This is alpha quality code, so the interface may change.

Features

  • Read zip archive from a file, a filehandle or from an in-memory buffer.

  • Perl Filehandle interface for reading a zip member.

  • Supports deflate, store, bzip2 and lzma compression.

  • Supports Zip64, so can read archves larger than 4Gig and/or have greater than 64K members.

Constructor

     $z = new Archive::Zip::SimpleUnzip "myzipfile.zip" [, OPTIONS] ;
     $z = new Archive::Zip::SimpleUnzip \$buffer [, OPTIONS] ;
     $z = new Archive::Zip::SimpleUnzip $filehandle [, OPTIONS] ;

The constructor takes one mandatory parameter along with zero or more optional parameters.

The mandatory parameter controls where the zip archive is read from. This can be any one of the following

  • Input from a Filename

    When SimpleUnzip is passed a string, it will read the zip archive from the filename stored in the string.

  • Input from a String

    When SimpleUnzip is passed a string reference, like \$buffer, it will read the in-memory zip archive from that string.

  • Input from a Filehandle

    When SimpleUnzip is passed a filehandle, it will read the zip archive from that filehandle. Note the filehandle must be seekable.

See "Options" for a list of the optional parameters that can be specified when calling the constructor.

Options

None yet.

Methods

$buffer = $z->content($member)

Returns the payload data for $member. Returns undef if the member does not exist.

$string = $z->comment()

Returns the comment, if any, associated with the zip archive.

$z->exists("name")

Tests for the existence of member "name" in the zip archive.

$count = $z->names()
@names = $z->names()

In scalar context returns the number of members in the Zip archive.

In array context returns a list of the names of the members in the Zip archive.

$z->next()

Returns the next member from the zip archive as a Archive::Zip::SimpleUnzip::Member object. See "Archive::Zip::SimpleUnzip::Member"

Standard usage is

    use Archive::Zip::SimpleUnzip qw($SimpleUnzipError) ;

    my $match = "hello";
    my $zipfile = "my.zip";

    my $z = new Archive::Zip::SimpleUnzip $zipfile
        or die "Cannot open zip file: $SimpleUnzipError\n" ;

    while (my $member = $z->next())
    {
        my $name = $member->name();       
        my $fh = $member->open();
        while (<$fh>)
        {
            my $offset = 
            print "$name, line $.\n" if /$match/;
        }
    }

Archive::Zip::SimpleUnzip::Member

The next method returns a member object of type Archive::Zip::SimpleUnzip::Member that has the following methods.

$string = $m->name()

Returns the name of the member.

$string = $m->comment()

Returns the member comment.

$data = $m->content()

Returns the uncompressed content.

$fh = $m->open()

Returns a filehandle that can be used to read the uncompressed content.

Examples

The code below shoes how this module is used to read the contents of the member "abc.txt" from the zip archive "my1.zip".

    use Archive::Zip::SimpleUnzip qw($SimpleUnzipError) ;

    my $z = new Archive::Zip::SimpleUnzip "my1.zip"
        or die "Cannot open zip file: $SimpleUnzipError\n" ;

    my $name = "abc.txt";
    if ($z->exists($name))
    {
        print $z->content($name);
    }
    else
    {
        warn "$name not present in my1.zip\n"
    }

Iterate through a Zip file

    use Archive::Zip::SimpleUnzip qw($SimpleUnzipError) ;

    my $zipfile = "my.zip";
    my $z = new Archive::Zip::SimpleUnzip $zipfile
        or die "Cannot open zip file: $SimpleUnzipError\n" ;

    my $members = $z->names();
    print "Zip file '$zipfile' has $members entries\n";

    while (my $member = $z->next())
    {    
        print "$member->name()\n";
    }

Filehandle interface

Here is a simple grep, that walks through a zip file and prints matching strings.

    use Archive::Zip::SimpleUnzip qw($SimpleUnzipError) ;

    my $match = "hello";
    my $zipfile = "my.zip";

    my $z = new Archive::Zip::SimpleUnzip $zipfile
        or die "Cannot open zip file: $SimpleUnzipError\n" ;

    while (my $member = $z->next())
    {
        my $name = $member->name();       
        my $fh = $member->open();
        while (<$fh>)
        {
            my $offset = 
            print "$name, line $.\n" if /$match/;
        }
    }

Zip File Interoperability

The intention is to be interoperable with zip archives created by other programs, like pkzip or WinZip, but the majority of testing carried out used the Info-Zip zip/unzip programs running on Linux.

This doesn't necessarily mean that there is no interoperability with other zip programs like pkzip and WinZip - it just means that I haven't tested them. Please report any issues you find.

Compression Methods Supported

The following compression methods are supported

deflate (8)

This is the most common compression used in zip archives.

store (0)

This is used when no compression has been carried out.

bzip2 (12)

Only if the IO-Compress-Bzip2 module is available.

lzma (14)

Only if the IO-Compress-Lzma module is available.

Zip64 Support

This modules supports Zip64, so it can read archves larger than 4Gig and/or have greater than 64K members.

Limitations

The following features are no currently supported.

SEE ALSO

Archive::Zip::SimpleZip, Archive::Zip, IO::Compress::Zip, IO::Uncompress::UnZip

AUTHOR

This module was written by Paul Marquess, pmqs@cpan.org.

MODIFICATION HISTORY

See the Changes file.

COPYRIGHT AND LICENSE

Copyright (c) 2018 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.