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module EventMachine
module WebSocket
class MaskedString < String
# Read a 4 bit XOR mask - further requested bytes will be unmasked
def read_mask
if respond_to?(:encoding) && encoding.name != "ASCII-8BIT"
raise "MaskedString only operates on BINARY strings"
end
raise "Too short" if bytesize < 4 # TODO - change
@masking_key = String.new(self[0..3])
end
# Removes the mask, behaves like a normal string again
def unset_mask
@masking_key = nil
end
def getbyte(index)
if defined?(@masking_key) && @masking_key
masked_char = super
masked_char ? masked_char ^ @masking_key.getbyte(index % 4) : nil
else
super
end
end
def getbytes(start_index, count)
data = ''
data.force_encoding('ASCII-8BIT') if data.respond_to?(:force_encoding)
count.times do |i|
data << getbyte(start_index + i)
end
data
end
end
end
end
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