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Current File : /usr/share/perl5/MIME//Types.pod
=encoding utf8

=head1 NAME

MIME::Types - Definition of MIME types

=head1 INHERITANCE

 MIME::Types
   is an Exporter

=head1 SYNOPSIS

 use MIME::Types;
 my $mt    = MIME::Types->new(...);    # MIME::Types object
 my $type  = $mt->type('text/plain');  # MIME::Type  object
 my $type  = $mt->mimeTypeOf('gif');
 my $type  = $mt->mimeTypeOf('picture.jpg');
 my @types = $mt->httpAccept('text/html, application/json;q=0.1')

=head1 DESCRIPTION

MIME types are used in many applications (for instance as part of e-mail
and HTTP traffic) to indicate the type of content which is transmitted.
or expected.  See RFC2045 at F<https://www.ietf.org/rfc/rfc2045.txt>

Sometimes detailed knowledge about a mime-type is need, however this
module only knows about the file-name extensions which relate to some
filetype.  It can also be used to produce the right format: types
which are not registered at IANA need to use 'x-' prefixes.

This object administers a huge list of known mime-types, combined
from various sources.  For instance, it contains B<all IANA> types
and the knowledge of Apache.  Probably the most complete table on
the net!

=head2 MIME::Types and daemons (fork)

If your program uses fork (usually for a daemon), then you want to have
the type table initialized before you start forking. So, first call

   my $mt = MIME::Types->new;

Later, each time you create this object (you may, of course, also reuse
the object you create here) you will get access to B<the same global table>
of types.

=head1 METHODS

=head2 Constructors

=over 4

=item MIME::Types-E<gt>B<new>(%options)

Create a new C<MIME::Types> object which manages the data.  In the current
implementation, it does not matter whether you create this object often
within your program, but in the future this may change.

 -Option         --Default
  db_file          <installed source>
  only_complete    <false>
  only_iana        <false>
  skip_extensions  <false>

=over 2

=item db_file => FILENAME

The location of the database which contains the type information.  Only the
first instantiation of this object will have this parameter obeyed.

[2.10] This parameter can be globally overruled via the C<PERL_MIME_TYPE_DB>
environment variable, which may be needed in case of PAR or other tricky
installations.  For PAR, you probably set this environment variable to
"inc/lib/MIME/types.db"

=item only_complete => BOOLEAN

Only include complete MIME type definitions: requires at least one known
extension.  This will reduce the number of entries --and with that the
amount of memory consumed-- considerably.

In your program you have to decide: the first time that you call
the creator (C<new>) determines whether you get the full or the partial
information.

=item only_iana => BOOLEAN

Only load the types which are currently known by IANA.

=item skip_extensions => BOOLEAN

Do not load the table to map extensions to types, which is quite large.

=back

=back

=head2 Knowledge

=over 4

=item $obj-E<gt>B<addType>($type, ...)

Add one or more TYPEs to the set of known types.  Each TYPE is a
C<MIME::Type> which must be experimental: either the main-type or
the sub-type must start with C<x->.

Please inform the maintainer of this module when registered types
are missing.  Before version MIME::Types version 1.14, a warning
was produced when an unknown IANA type was added.  This has been
removed, because some people need that to get their application
to work locally... broken applications...

=item $obj-E<gt>B<extensions>()

Returns a list of all defined extensions.

=item $obj-E<gt>B<listTypes>()

Returns a list of all defined mime-types by name only.  This will B<not>
instantiate L<MIME::Type|MIME::Type> objects.  See L<types()|MIME::Types/"Knowledge">

=item $obj-E<gt>B<mimeTypeOf>($filename)

Returns the C<MIME::Type> object which belongs to the FILENAME (or simply
its filename extension) or C<undef> if the file type is unknown.  The extension
is used and considered case-insensitive.

In some cases, more than one type is known for a certain filename extension.
In that case, the preferred one is taken (for an unclear definition of
preference)

example: use of mimeTypeOf()

 my $types = MIME::Types->new;
 my $mime = $types->mimeTypeOf('gif');

 my $mime = $types->mimeTypeOf('picture.jpg');
 print $mime->isBinary;

=item $obj-E<gt>B<type>($string)

Returns the C<MIME::Type> which describes the type related to STRING.
[2.00] Only one type will be returned.

[before 2.00] One type may be described more than once.  Different
extensions may be in use for this type, and different operating systems
may cause more than one C<MIME::Type> object to be defined.  In scalar
context, only the first is returned.

=item $obj-E<gt>B<types>()

Returns a list of all defined mime-types.  For reasons of backwards
compatibility, this will instantiate L<MIME::Type|MIME::Type> objects, which will
be returned.  See L<listTypes()|MIME::Types/"Knowledge">.

=back

=head2 HTTP support

=over 4

=item $obj-E<gt>B<httpAccept>($header)

[2.07] Decompose a typical HTTP-Accept header, and sort it based on the
included priority information.  Returned is a sorted list of type names,
where the highest priority type is first.  The list may contain '*/*'
(accept any) or a '*' as subtype.

Ill-formated typenames are ignored.  On equal qualities, the order is
kept.  See RFC2616 section 14.1

example: 

  my @types = $types->httpAccept('text/html, application/json;q=0.9');

=item $obj-E<gt>B<httpAcceptBest>($accept|\@types, @have)

[2.07] The C<$accept> string is processed via L<httpAccept()|MIME::Types/"HTTP support"> to order the
types on preference.  You may also provide a list of ordered C<@types>
which may have been the result of that method, called earlier.

As second parameter, you pass a LIST of types you C<@have> to offer.
Those need to be L<MIME::Type|MIME::Type> objects. The preferred type will get
selected.  When none of these are accepted by the client, this will
return C<undef>.  It should result in a 406 server response.

example: 

   my $accept = $req->header('Accept');
   my @have   = map $mt->type($_), qw[text/plain text/html];
   my @ext    = $mt->httpAcceptBest($accept, @have);

=item $obj-E<gt>B<httpAcceptSelect>($accept|\@types, @filenames|\@filenames)

[2.07] Like L<httpAcceptBest()|MIME::Types/"HTTP support">, but now we do not return a pair with mime-type
and filename, not just the type.  If $accept is C<undef>, the first
filename is returned.

example: 

   use HTTP::Status ':constants';
   use File::Glob   'bsd_glob';    # understands blanks in filename

   my @filenames   = bsd_glob "$imagedir/$fnbase.*;
   my $accept      = $req->header('Accept');
   my ($fn, $mime) = $mt->httpAcceptSelect($accept, @filenames);
   my $code        = defined $mime ? HTTP_NOT_ACCEPTABLE : HTTP_OK;

=back

=head1 FUNCTIONS

The next functions are provided for backward compatibility with MIME::Types
versions [0.06] and below.  This code originates from Jeff Okamoto
F<okamoto@corp.hp.com> and others.

=over 4

=item B<by_mediatype>(TYPE)

This function takes a media type and returns a list or anonymous array of
anonymous three-element arrays whose values are the file name suffix used to
identify it, the media type, and a content encoding.

TYPE can be a full type name (contains '/', and will be matched in full),
a partial type (which is used as regular expression) or a real regular
expression.

=item B<by_suffix>(FILENAME|SUFFIX)

Like C<mimeTypeOf>, but does not return an C<MIME::Type> object. If the file
+type is unknown, both the returned media type and encoding are empty strings.

example: use of function by_suffix()

 use MIME::Types 'by_suffix';
 my ($mediatype, $encoding) = by_suffix('image.gif');

 my $refdata = by_suffix('image.gif');
 my ($mediatype, $encoding) = @$refdata;

=item B<import_mime_types>()

This method has been removed: mime-types are only useful if understood
by many parties.  Therefore, the IANA assigns names which can be used.
In the table kept by this C<MIME::Types> module all these names, plus
the most often used temporary names are kept.  When names seem to be
missing, please contact the maintainer for inclusion.

=back

=head1 SEE ALSO

This module is part of MIME-Types distribution version 2.24,
built on December 28, 2022. Website: F<http://perl.overmeer.net/CPAN/>

=head1 LICENSE

Copyrights 1999-2022 by [Mark Overmeer <markov@cpan.org>]. For other contributors see ChangeLog.

This program is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.
See F<http://dev.perl.org/licenses/>


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