Beefy Boxes and Bandwidth Generously Provided by pair Networks
We don't bite newbies here... much

comment on

( #3333=superdoc: print w/replies, xml ) Need Help??
I think the right tool for this job would be Archive::Zip. Here's one way to do what you described - you want to be able to compare file sizes, and when they match, you want to compare the CRC32 values, just to be sure.

(And if you don't want to trust just the file-size and CRC comparisons, it would be easy enough, and some extra run-time, to test if file contents from the zip are equal to (eq) file contents from the directory. But that's probably overkill.)

#!/usr/bin/perl use strict; use Archive::Zip; my $Usage = "$0 [test_path]\n (default test_path is '.')\n"; die $Usage unless ( @ARGV and -f $ARGV[0] ); my $zipfile = shift; my $testpath = shift || '.'; my $zip = Archive::Zip->new( $zipfile ) or die "Archive::Zip was unable to read $zipfile\n"; my ( @missing_from_path, @altered ); for my $member ( $zip->members ) { next if ( $member->isDirectory ); my $filepath = $member->fileName; if ( ! -f "$testpath/$filepath" ) { push @missing_from_path, $filepath; next; } if ( -s _ == $member->uncompressedSize ) { if ( open( my $testfile, '<', "$testpath/$filepath" )) { local $/; $_ = <$testfile>; close $testfile; my $testCRC = $zip->computeCRC32( $_ ); next if ( $testCRC eq $member->crc32 ); } else { warn "Unable to read $testpath/$filepath: $!\n"; } } push @altered, $filepath; } print "Comparing $zipfile to $testpath:\n"; if ( @missing_from_path ) { print " Missing files:\n"; print " $testpath/$_\n" for ( sort @missing_from_path ); } else { print " No files missing\n"; } if ( @altered ) { print " Altered files:\n"; print " $testpath/$_\n" for ( sort @altered ); } else { print " No altered files\n"; } =head1 NAME zip-check -- check zip file against directory contents =head1 SYNOPSIS zip-check [path/to/] [test_path] (default test_path is '.') =head1 DESCRIPTION This script will compare the contents of a given zip file against the contents of a given directory (current working directory by default). We check for two types of differences: - Files in the zip archive that are not found in the directory - Files found in both places, but having different contents (based on comparing their CRC32 values) (We do not report cases where the directory contains files that are not found in the zip archive.) =head1 AUTHOR David Graff <graff at ldc dot upenn dot edu> =cut

In reply to Re: Calculating differences between the contents of a zip and a directory by graff
in thread Calculating differences between the contents of a zip and a directory by MilanorTSW

Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":

  • Are you posting in the right place? Check out Where do I post X? to know for sure.
  • Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
    <code> <a> <b> <big> <blockquote> <br /> <dd> <dl> <dt> <em> <font> <h1> <h2> <h3> <h4> <h5> <h6> <hr /> <i> <li> <nbsp> <ol> <p> <small> <strike> <strong> <sub> <sup> <table> <td> <th> <tr> <tt> <u> <ul>
  • Snippets of code should be wrapped in <code> tags not <pre> tags. In fact, <pre> tags should generally be avoided. If they must be used, extreme care should be taken to ensure that their contents do not have long lines (<70 chars), in order to prevent horizontal scrolling (and possible janitor intervention).
  • Want more info? How to link or or How to display code and escape characters are good places to start.
Log In?

What's my password?
Create A New User
Domain Nodelet?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others rifling through the Monastery: (6)
As of 2022-05-17 08:17 GMT
Find Nodes?
    Voting Booth?
    Do you prefer to work remotely?

    Results (65 votes). Check out past polls.