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module Plum
module Decoders
class Base
def decode(chunk)
chunk
end
def finish
end
end
# `deflate` is not just deflate, wrapped by zlib format (RFC 1950)
class Deflate < Base
def initialize
@inflate = Zlib::Inflate.new(Zlib::MAX_WBITS)
end
def decode(chunk)
@inflate.inflate(chunk)
rescue Zlib::Error
raise DecoderError.new("failed to decode chunk", $!)
end
def finish
@inflate.finish
rescue Zlib::Error
raise DecoderError.new("failed to finalize", $!)
end
end
class GZip < Base
def initialize
@stream = Zlib::Inflate.new(Zlib::MAX_WBITS + 16)
end
def decode(chunk)
@stream.inflate(chunk)
rescue Zlib::Error
raise DecoderError.new("failed to decode chunk", $!)
end
def finish
@stream.finish
rescue Zlib::Error
raise DecoderError.new("failed to finalize", $!)
end
end
DECODERS = { "gzip" => GZip, "deflate" => Deflate }
end
end
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