API:EPrints/Sword/FileType

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NAME

File::Type - determine file type using magic

SYNOPSIS

   my $ft = File::Type->new();
   
   # read in data from file to $data, then
   my $type_from_data = $ft->checktype_contents($data);
   
   # alternatively, check file from disk
   my $type_from_file = $ft->checktype_filename($file);
 
   # convenient method for checking either a file or data
   my $type_1 = $ft->mime_type($file);
   my $type_2 = $ft->mime_type($data);
 

DESCRIPTION

File::Type uses magic numbers (typically at the start of a file) to determine the MIME type of that file.

File::Type can use either a filename, or file contents, to determine the type of a file.

METHODS

new

Returns a new File::Type object.

mime_type($argument)

Takes either data or a filename, determines what it is, and passes the argument through to the relevant method below. If the argument is a directory, returns undef.

checktype_filename($filename)

Opens $filename (if possible; if not, returns undef) and returns the MIME type of the file.

checktype_contents($data)

Matches $data against the magic database criteria and returns the MIME type of the file.

BUGS

None known.

NOTES

Some magic definitions in the mime-magic file used in the creation of this module vary from those in other apps (eg image/x-png not image/png).

SEE ALSO

File::MMagic and File::MimeInfo perform the same job, but have a number of problems that led to the creation of this module.

File::MMagic inlines a copy of the magic database, and uses a DATA filehandle, which causes problems when running under mod_perl.

File::MimeInfo uses an external magic file, and relies on file extensions rather than magic to determine the mime type.

As a result, File::Type uses a seperate module and script to create the code at the core of this module, which means that there is no need to include a magic database at all, and that it is safe to run under mod_perl.

File::Type::Builder, which generates the code at the heart of this module.

ACKNOWLEDGMENTS

File::Type is built from a mime-magic file from cleancode.org. The original can be found at http://cleancode.org/cgi-bin/viewcvs.cgi/email/mime-magic.mime?rev=1.1.1.1.

AUTHOR

Paul Mison <pmison@fotango.com>

COPYRIGHT

Copyright 2003-2004 Fotango Ltd.

LICENSE

Licensed under the same terms as Perl itself.