Module: HTTP::Protocol::HTTP2::Padded

Included in:
DataFrame, HeadersFrame, PushPromiseFrame
Defined in:
lib/http/protocol/http2/padded.rb

Overview

Certain frames can have padding: http2.github.io/http2-spec/#padding

--------------- |Pad Length? (8)| ---------------———————————————–+ | Data (*) … --------------------------------------------------------------- | Padding (*) … ---------------------------------------------------------------

Constant Summary collapse

MODULUS =

We will round up frames to the given length:

0x0F

Instance Method Summary collapse

Instance Method Details

#pack(data, modulus: MODULUS, padding_size: nil, maximum_size: nil) ⇒ Object 



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# File 'lib/http/protocol/http2/padded.rb', line 46

def pack(data, modulus: MODULUS, padding_size: nil, maximum_size: nil)
	padding_size ||= (MODULUS - data.bytesize) % MODULUS
	
	if maximum_size
		maximum_padding_size = maximum_size - data.bytesize
		
		if padding_size > maximum_padding_size
			padding_size = maximum_padding_size
		end
	end
	
	if padding_size > 0
		set_flags(PADDED)
		
		buffer = String.new.b
		
		buffer << padding_size.chr
		buffer << data
		buffer << "\0" * padding_size
		
		super buffer
	else
		clear_flags(PADDED)
		
		super data
	end
end

#padded? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/http/protocol/http2/padded.rb', line 39

def padded?
	flag_set?(PADDED)
end

#unpack ⇒ Object 



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# File 'lib/http/protocol/http2/padded.rb', line 74

def unpack
	if padded?
		padding_size = @payload[0].ord
		data_size = @payload.bytesize - 1 - padding_size
		
		if data_size < 0
			raise ProtocolError, "Invalid padding length: #{padding_size}"
		end
		
		return @payload.byteslice(1, data_size)
	else
		return @payload
	end
end