#!/usr/bin/perl -w
# This program searches for the given Perl regular expression in a Zip archive.
# Archive is assumed to contain text files.
# By Ned Konz, perl@bike-nomad.com
# Usage:
#       perl zipGrep.pl 'pattern' myZip.zip
#
use strict;
use Archive::Zip qw(:CONSTANTS :ERROR_CODES);
if ( @ARGV != 2 )
{
        print <<EOF;
This program searches for the given Perl regular expression in a Zip archive.
Archive is assumed to contain text files.
Usage:
        perl $0 'pattern' myZip.zip
EOF
        exit 1;
}
my $pattern = shift;
$pattern = qr{$pattern};    # compile the regular expression
my $zipName = shift;
my $zip = Archive::Zip->new();
if ( $zip->read($zipName) != AZ_OK )
{
        die "Read error reading $zipName\n";
}
foreach my $member ( $zip->members() )
{
        my ( $bufferRef, $status, $lastChunk );
        my $memberName = $member->fileName();
        my $lineNumber = 1;
        $lastChunk = '';
        $member->desiredCompressionMethod(COMPRESSION_STORED);
        $status = $member->rewindData();
        die "rewind error $status" if $status != AZ_OK;
        while ( !$member->readIsDone() )
        {
                ( $bufferRef, $status ) = $member->readChunk();
                die "readChunk error $status"
                  if $status != AZ_OK && $status != AZ_STREAM_END;
                my $buffer = $lastChunk . $$bufferRef;
                while ( $buffer =~ m{(.*$pattern.*\n)}mg )
                {
                        print "$memberName:$1";
                }
                ($lastChunk) = $$bufferRef =~ m{([^\n\r]+)\z};
        }
        $member->endRead();
}