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require 'zlib'
module BinData
module Transform
# Transforms a zlib compressed data stream.
class Zlib < BinData::IO::Transform
transform_changes_stream_length!
def initialize(read_length)
super()
@length = read_length
end
def read(n)
@read ||= ::Zlib::Inflate.inflate(chain_read(@length))
@read.slice!(0...n)
end
def write(data)
@write ||= create_empty_binary_string
@write << data
end
def after_read_transform
raise IOError, "didn't read all data" unless @read.empty?
end
def after_write_transform
chain_write(::Zlib::Deflate.deflate(@write))
end
end
end
end
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