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package Protocol::HTTP2::Frame::Push_promise;
use strict;
use warnings;
use Protocol::HTTP2::Constants qw(:flags :errors :settings);
use Protocol::HTTP2::Trace qw(tracer);
sub decode {
my ( $con, $buf_ref, $buf_offset, $length ) = @_;
my ( $pad, $offset ) = ( 0, 0 );
my $frame_ref = $con->decode_context->{frame};
# Protocol errors
if (
# PP frames MUST be associated with a stream
$frame_ref->{stream} == 0
# PP frames MUST be allowed
|| !$con->dec_setting(SETTINGS_ENABLE_PUSH)
)
{
$con->error(PROTOCOL_ERROR);
return undef;
}
if ( $frame_ref->{flags} & PADDED ) {
$pad = unpack( 'C', substr( $$buf_ref, $buf_offset ) );
$offset += 1;
}
my $promised_sid = unpack 'N', substr $$buf_ref, $buf_offset + $offset, 4;
$promised_sid &= 0x7FFF_FFFF;
$offset += 4;
my $hblock_size = $length - $offset - $pad;
if ( $hblock_size < 0 ) {
tracer->error("Not enough space for header block\n");
$con->error(FRAME_SIZE_ERROR);
return undef;
}
$con->new_peer_stream($promised_sid) or return undef;
$con->stream_promised_sid( $frame_ref->{stream}, $promised_sid );
$con->stream_header_block( $frame_ref->{stream},
substr( $$buf_ref, $buf_offset + $offset, $hblock_size ) );
# PP header block complete
$con->stream_headers_done( $frame_ref->{stream} )
or return undef
if $frame_ref->{flags} & END_HEADERS;
return $length;
}
sub encode {
my ( $con, $flags_ref, $stream_id, $data_ref ) = @_;
my $promised_id = $data_ref->[0];
my $hblock_ref = $data_ref->[1];
return pack( 'N', $promised_id ) . $$hblock_ref;
}
1;
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