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using Plum::BinaryString
module Plum
module FrameUtils
# Splits the DATA frame into multiple frames if the payload size exceeds max size.
#
# @param max [Integer] The maximum size of a frame payload.
# @return [Array<Frame>] The splitted frames.
def split_data(max)
return [self] if self.length <= max
raise "Frame type must be DATA" unless self.type == :data
fragments = self.payload.each_byteslice(max).to_a
frames = fragments.map {|fragment| Frame.new(type: :data, flags: [], stream_id: self.stream_id, payload: fragment) }
frames.first.flags = self.flags - [:end_stream]
frames.last.flags = self.flags & [:end_stream]
frames
end
# Splits the HEADERS or PUSH_PROMISE frame into multiple frames if the payload size exceeds max size.
#
# @param max [Integer] The maximum size of a frame payload.
# @return [Array<Frame>] The splitted frames.
def split_headers(max)
return [self] if self.length <= max
raise "Frame type must be HEADERS or PUSH_PROMISE" unless [:headers, :push_promise].include?(self.type)
fragments = self.payload.each_byteslice(max).to_a
frames = fragments.map {|fragment| Frame.new(type: :continuation, flags: [], stream_id: self.stream_id, payload: fragment) }
frames.first.type_value = self.type_value
frames.first.flags = self.flags - [:end_headers]
frames.last.flags = self.flags & [:end_headers]
frames
end
# Parses SETTINGS frame payload. Ignores unknown settings type (see RFC7540 6.5.2).
#
# @return [Hash<Symbol, Integer>] The parsed strings.
def parse_settings
settings = {}
payload.each_byteslice(6) do |param|
id = param.uint16
name = Frame::SETTINGS_TYPE.key(id)
# ignore unknown settings type
settings[name] = param.uint32(2) if name
end
settings
end
end
end
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