Update POD for bro to include configurables

[io-compress-brotli.git] / lib / IO / Compress / Brotli.pm

package IO::Compress::Brotli;

use 5.014000;
use strict;
use warnings;
use parent qw/Exporter/;

use IO::Uncompress::Brotli;

our @EXPORT = qw/bro/;
our @EXPORT_OK = @EXPORT;

our $VERSION = '0.004001';

my %BROTLI_ENCODER_MODE = ( generic => 0, text => 1, font => 2 );
sub mode {
    my ($self, $mode) = @_;

    die "Invalid encoder mode"
        unless $BROTLI_ENCODER_MODE{$mode};

    _mode($$self, $mode)
}


1;
__END__

=encoding utf-8

=head1 NAME

IO::Compress::Brotli - Write Brotli buffers/streams

=head1 SYNOPSIS

  use IO::Compress::Brotli;

  # compress a buffer
  my $encoded = bro $encoded;

  # compress a stream
  my $bro = IO::Compress::Brotli->create;
  while(have_input()) {
     my $block = get_input_block();
     my $encoded_block = $bro->compress($block);
     handle_output_block($encoded_block);
  }
  # Need to finish the steam
  handle_output_block($bro->finish());

=head1 DESCRIPTION

IO::Compress::Brotli is a module that compressed Brotli buffers
and streams. Despite its name, it is not a subclass of
L<IO::Compress::Base> and does not implement its interface. This
will be rectified in a future release.

=head2 One-shot interface

If you have the whole buffer in a Perl scalar use the B<bro>
function.

=over

=item B<bro>(I<$input>, I<$quality>, I<$window>)

Takes a whole uncompressed buffer as input and returns the compressed
data using the supplied quality and window parameters. If quality and
window parameters are not supplied, default values are used (as
described under the object-oriented interface).

Exported by default.

=back

=head2 Streaming interface

If you want to process the data in blocks use the object oriented
interface. The available methods are:

=over

=item IO::Compress::Brotli->B<create>

Returns a IO::Compress::Brotli instance. Please note that a single
instance cannot be used to decompress multiple streams.

=item $bro->B<window>(I<$window>)

Sets the window parameter on the brotli encoder.
Defaults to BROTLI_DEFAULT_WINDOW (22).

=item $bro->B<quality>(I<$quality>)

Sets the quality paremeter on the brotli encoder.
Defaults to BROTLI_DEFAULT_QUALITY (11).

=item $bro->B<mode>(I<$mode>)

Sets the brotli encoder mode, which can be any of "generic",
"text" or "font". Defaults to "generic".

=item $bro->B<compress>(I<$block>)

Takes the a block of uncompressed data and returns a block of
compressed data. Dies on error.

=item $bro->B<flush>()

Flushes any pending output from the encoder.

=item $bro->B<finish>()

Tells the encoder to start the finish operation, and flushes
any remaining compressed output.

Once finish is called, the encoder cannot be used to compress
any more content.

B<NOTE>: Calling finish is B<required>, or the output might
remain unflushed, and the be missing termination marks.

=back

=head1 SEE ALSO

Brotli Compressed Data Format Internet-Draft:
L<https://www.ietf.org/id/draft-alakuijala-brotli-08.txt>

Brotli source code: L<https://github.com/google/brotli/>

=head1 AUTHOR

Marius Gavrilescu, E<lt>marius@ieval.roE<gt>

The encoder bindings, modernisation of the decoder bindings and a
clean up of the overall project were contributed by:

=over

=item Quim Rovira, E<lt>quim@rovira.catE<gt>

=item Ævar Arnfjörð Bjarmason, E<lt>avarab@gmail.comE<gt>

=item Marcell Szathmári

=item Mattia Barbon, E<lt>mattia@barbon.orgE<gt>

=back

=head1 COPYRIGHT AND LICENSE

Copyright (C) 2015-2018 by Marius Gavrilescu

This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself, either Perl version 5.20.2 or,
at your option, any later version of Perl 5 you may have available.


=cut