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Digest::MD5::File.3pm

NAME

Digest::MD5::File - Perl extension for getting MD5 sums for files and urls.

SYNOPSIS

     use Digest::MD5::File qw(dir_md5_hex file_md5_hex url_md5_hex);
 
     my $md5 = Digest::Md5->new;
     $md5->addpath('/path/to/file');
     my $digest = $md5->hexdigest;
 
     my $digest = file_md5($file);
     my $digest = file_md5_hex($file);
     my $digest = file_md5_base64($file);
 
     my $md5 = Digest::Md5->new;
     $md5->addurl('http://www.tmbg.com/tour.html');
     my $digest = $md5->hexdigest;
 
     my $digest = url_md5($url);
     my $digest = url_md5_hex($url);
     my $digest = url_md5_base64($url);
   
     my $md5 = Digest::Md5->new;
     $md5->adddir('/directory');
     my $digest = $md5->hexdigest;
 
     my $dir_hashref = dir_md5($dir);    
     my $dir_hashref = dir_md5_hex($dir);    
     my $dir_hashref = dir_md5_base64($dir);
 
 

DESCRIPTION

   Get MD5 sums for files of a given path or content of a given url.
 
 

EXPORT

None by default. You can export any file_* dir_*, or url_* function and anything Digest::MD5 can export.

    use Digest::MD5::File qw(md5 md5_hex md5_base64); # 3 Digest::MD5 functions
    print md5_hex('abc123'), "\n";
    print md5_base64('abc123'), "\n";
 
 

OBJECT METHODS

addpath()

     my $md5 = Digest::Md5->new;
     $md5->addpath('/path/to/file.txt') 
         or die "file.txt is not where you said: $!";
 
 

or you can add multiple files by specifying an array ref of files:

     $md5->addpath(\@files);
 
 

adddir()

addpath()s each file in a directory recursively. Follows the same rules as the dir_* functions.

     my $md5 = Digest::Md5->new;
     $md5->adddir('/home/tmbg/') 
         or die "See warning above to see why I bailed: $!";
 
 

addurl()

     my $md5 = Digest::Md5->new;
     $md5->addurl('http://www.tmbg.com/tour.html')
         or die "They Must Be not on tour";
 
 

file_* functions

Get the digest in variouse formats of $file. If file does not exist or is a directory it croaks (See NOFATALS for more info)

     my $digest = file_md5($file) or warn "$file failed: $!";
     my $digest = file_md5_hex($file) or warn "$file failed: $!";
     my $digest = file_md5_base64($file) or warn "$file failed: $!";
 
 

dir_* functions

Returns a hashref whose keys are files relative to the given path and the values are the MD5 sum of the file or and empty string if a directory. It recurses through the entire depth of the directory. Symlinks to files are just addpath()d and symlinks to directories are followed.

     my $dir_hashref = dir_md5($dir) or warn "$dir failed: $!";
     my $dir_hashref = dir_md5_hex($dir) or warn "$dir failed: $!";
     my $dir_hashref = dir_md5_base64($dir) or warn "$dir failed: $!";
 
 

url_* functions

Get the digest in various formats of the content at $url (Including, if $url points to directory, the directory listing content). Returns undef if url fails (IE if LWP::UserAgent's $res->is_success is false)

     my $digest = url_md5($url) or warn "$url failed"; 
     my $digest = url_md5_hex($url) or warn "$url failed";
     my $digest = url_md5_base64($url) or warn "$url failed";
 
 

SPECIAL SETTINGS

BINMODE

By default files are opened in binmode. If you do not want to do this you can unset it a variety of ways:

     use Digest::MD5::File qw(-nobin);
 
 

or

     $Digest::MD5::File::BINMODE = 0;
 
 

or at the function/method level by specifying its value as the second argument:

     $md5->addpath($file,0);
 
     my $digest = file_md5_hex($file,0);
 
 

UTF8

In some cases you may want to have your data utf8 encoded, you can do this the following ways:

     use Digest::MD5::File qw(-utf8);
 
 

or

     $Digest::MD5::File::UTF8 = 1;
 
 

or at the function/method level by specifying its value as the third argument for files and second for urls:

     $md5->addpath($file,$binmode,1);
 
     my $digest = file_md5_hex($file,$binmode,1);
 
     $md5->addurl($url,1);
 
     url_md5_hex($url,1);
 
 

It use's Encode's encode_utf8() function to do the encoding. So if you do not have Encode (pre 5.7.3) this won't work :)

NOFATALS

Instead of croaking it will return undef if you set NOFATALS to true.

You can do this two ways:

     $Digest::MD5::File::NOFATALS = 1;
 
 

or the -nofatals flag:

     use Digest::MD5::File qw(-nofatals);
 
     my $digest = file_md5_hex($file) or die "$file failed";
 
 

$! is not set so its not really helpful if you die().

SEE ALSO

Digest::MD5, Encode, LWP::UserAgent

AUTHOR

Daniel Muey, <http://drmuey.com/cpan_contact.pl>

COPYRIGHT AND LICENSE

Copyright 2005 by Daniel Muey

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