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# File 'lib/web/web-socket-ruby/lib/web_socket.rb', line 181
def receive()
if !@handshaked
raise(WebSocket::Error, "call WebSocket\#handshake first")
end
case @web_socket_version
when "hixie-75", "hixie-76"
packet = gets(force_encoding("\xff", "ASCII-8BIT"))
return nil if !packet
if packet =~ /\A\x00(.*)\xff\z/nm
return force_encoding($1, "UTF-8")
elsif packet == "\xff" && read(1) == "\x00"
close(1005, "", :peer)
return nil
else
raise(WebSocket::Error, "input must be either '\\x00...\\xff' or '\\xff\\x00'")
end
else
while true
begin
bytes = read(2).unpack("C*")
fin = (bytes[0] & 0x80) != 0
opcode = bytes[0] & 0x0f
mask = (bytes[1] & 0x80) != 0
plength = bytes[1] & 0x7f
if plength == 126
bytes = read(2)
plength = bytes.unpack("n")[0]
elsif plength == 127
bytes = read(8)
(high, low) = bytes.unpack("NN")
plength = high * (2 ** 32) + low
end
if @server && !mask
@socket.close()
raise(WebSocket::Error, "received unmasked data")
end
mask_key = mask ? read(4).unpack("C*") : nil
payload = read(plength)
payload = apply_mask(payload, mask_key) if mask
if WebSocket.debug
$stderr.printf("recv_frame> opcode:%d fin:%d payload:%p\n" % [opcode, fin ? 1 : 0, payload])
end
case opcode
when OPCODE_TEXT
return force_encoding(payload, "UTF-8")
when OPCODE_BINARY
raise(WebSocket::Error, "received binary data, which is not supported")
when OPCODE_CLOSE
close(1005, "", :peer)
return nil
when OPCODE_PING
raise(WebSocket::Error, "received ping, which is not supported")
when OPCODE_PONG
next
else
raise(WebSocket::Error, "received unknown opcode: %d" % opcode)
end
rescue EOFError
return nil
end
end
end
end
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