file::type::webimages(3pm) [debian man page]

File::Type::WebImages(3pm)				User Contributed Perl Documentation				File::Type::WebImages(3pm)

NAME

       File::Type::WebImages - determine web image file types using magic

SYNOPSIS

	   use File::Type::WebImages 'mime_type';

	   my $type_1 = mime_type($file);
	   my $type_2 = mime_type($data);

DESCRIPTION

       "mime_type()" can use either a filename, or file contents, to determine the type of a file. The process involves looking the data at the
       beginning of the file, sometimes called "magic numbers".

THE BIG TRADE OFF

       For minimum memory consumption, only the following common web image  file types are supported:

       BMP, GIF, JPEG and PNG.	( image/bmp, image/gif, image/jpeg and image/png ).

       Unlike with File::Type and File::MMagic, 'undef', not "application/octet-stream" will be returned for unknown formats.

       Unlike File::Type, we return "image/png" for PNGs, not "image/x-png";

       If you want more mime types detected use File::Type or some other module.

TODO

       It would be even better to have a pluggable system that would allow you to plug-in different sets of MIME-types you care about.

SEE ALSO

       File::Type. Similar, but supports over 100 file types.

ACKNOWLEDGMENTS

       File::Type::WebImages 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>.

AUTHORS

       Paul Mison <pmison@fotango.com> - wrote original File::Type Mark Stosberg <mark@summersault.com> - hacked up this.

COPYRIGHT

       Copyright 2003-2004 Fotango Ltd.

LICENSE

       Licensed under the same terms as Perl itself.

perl v5.10.1							    2011-04-23						File::Type::WebImages(3pm)

File::Type::Builder(3pm)				User Contributed Perl Documentation				  File::Type::Builder(3pm)

NAME

       File::Type::Builder - parse mime-magic and generate code

SYNOPSIS

	   my $build = File::Type::Builder->new();

	   while (<magic>) {
	     chomp;
	     my $parsed = $build->parse_magic($_);

	     my $code	= $build->string_start($parsed);
	     (or string_offset or beshort)
	   }

DESCRIPTION

       Reads in the mime-magic file format and translates it to code.  (This documentation would be longer if I really expected anyone other than
       me to run the code.)

METHODS

       new

       Creates a new File::Type::Builder object.

       parse_magic

       Pulls apart a line of a mime-magic file using a string of regular expressions.

       An example mime-magic file can be found in cleancode CVS at <http://cleancode.org/cgi-bin/viewcvs.cgi/email/mime-magic.mime?rev=1.1.1.1>

       string

       Builds code to match magic that's of type string.

       Has to do some cleverness to make the regular expression work properly.

       be

       Builds code to match 'beshort' and 'belong' magic (eg audio/mpeg, image/jpeg).

PRIVATE METHODS

       _substr_matching

       Sometimes the data is smaller than the offset we're looking for in the file. If this is the case, then the file is obviously not of that
       type, and furthermore we should avoid issuing a couple of warnings that Perl would otherwise emit.

       This subroutine generates this code.

       _get_escapes

       Returns a reference to a hash defining characters that should not be escaped.

TODO

	   * Add handlers for other magic types (bedate, byte, etc)

	   * Make verbosity/logging nicer.

	   * Find more edge cases.

	   * Remove redundant 'if (length $data > 0)' check.

       Longer term:

	   * Fix for multiple magic format types?

BUGS

       Incomplete. Some known issues with odd entries in mime-magic. Skips some mime-magic lines.

SEE ALSO

       File::Type, which is partially generated by this module.

AUTHOR

       Paul Mison <pmison@fotango.com>

COPYRIGHT

       Copyright 2003 Fotango Ltd.

LICENSE

       Licensed under the same terms as Perl itself.

perl v5.8.8							    2004-10-08						  File::Type::Builder(3pm)