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package Protocol::HTTP2::Frame::Window_update;
use strict;
use warnings;
use Protocol::HTTP2::Constants qw(:flags :errors :limits);
use Protocol::HTTP2::Trace qw(tracer);
sub decode {
my ( $con, $buf_ref, $buf_offset, $length ) = @_;
my $frame_ref = $con->decode_context->{frame};
if ( $length != 4 ) {
tracer->error(
"Received windows_update frame with invalid length $length");
$con->error(FRAME_SIZE_ERROR);
return undef;
}
my $fcw_add = unpack 'N', substr $$buf_ref, $buf_offset, 4;
$fcw_add &= 0x7FFF_FFFF;
if ( $fcw_add == 0 ) {
tracer->error("Received flow-control window increment of 0");
$con->error(PROTOCOL_ERROR);
return undef;
}
if ( $frame_ref->{stream} == 0 ) {
if ( $con->fcw_send($fcw_add) > MAX_FCW_SIZE ) {
$con->error(FLOW_CONTROL_ERROR);
}
else {
$con->send_blocked();
}
}
else {
my $fcw = $con->stream_fcw_send( $frame_ref->{stream}, $fcw_add );
if ( defined $fcw && $fcw > MAX_FCW_SIZE ) {
tracer->warning("flow-control window size exceeded MAX_FCW_SIZE");
$con->stream_error( $frame_ref->{stream}, FLOW_CONTROL_ERROR );
}
elsif ( defined $fcw ) {
$con->stream_send_blocked( $frame_ref->{stream} );
}
}
return $length;
}
sub encode {
my ( $con, $flags_ref, $stream, $data ) = @_;
return pack 'N', $data;
}
1;
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