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# frozen_string_literal: true
# Released under the MIT License.
# Copyright, 2019-2025, by Samuel Williams.
require_relative "frame"
require_relative "window"
module Protocol
module HTTP2
# The WINDOW_UPDATE frame is used to implement flow control.
#
# +-+-------------------------------------------------------------+
# |R| Window Size Increment (31) |
# +-+-------------------------------------------------------------+
#
class WindowUpdateFrame < Frame
TYPE = 0x8
FORMAT = "N"
# Pack a window size increment into the frame.
# @parameter window_size_increment [Integer] The window size increment value.
def pack(window_size_increment)
super [window_size_increment].pack(FORMAT)
end
# Unpack the window size increment from the frame payload.
# @returns [Integer] The window size increment value.
def unpack
super.unpack1(FORMAT)
end
# Read and validate the WINDOW_UPDATE frame payload.
# @parameter stream [IO] The stream to read from.
# @raises [FrameSizeError] If the frame length is invalid.
def read_payload(stream)
super
if @length != 4
raise FrameSizeError, "Invalid frame length: #{@length} != 4!"
end
end
# Apply this WINDOW_UPDATE frame to a connection for processing.
# @parameter connection [Connection] The connection to apply the frame to.
def apply(connection)
connection.receive_window_update(self)
end
end
end
end
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