lib/bindata/transform/lz4.rb
require 'extlz4'
module BinData
module Transform
# Transforms a LZ4 compressed data stream.
#
# gem install extlz4
class LZ4 < BinData::IO::Transform
transform_changes_stream_length!
def initialize(read_length)
super()
@length = read_length
end
def read(n)
@read ||= ::LZ4::decode(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(::LZ4::encode(@write))
end
end
end
end