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# frozen_string_literal: true
require "zlib"
module HTTPX
module Transcoder
module GZIP
class Deflater < Transcoder::Deflater
def initialize(body)
@compressed_chunk = "".b
@deflater = nil
super
end
def deflate(chunk)
@deflater ||= Zlib::GzipWriter.new(self)
if chunk.nil?
unless @deflater.closed?
@deflater.flush
@deflater.close
compressed_chunk
end
else
@deflater.write(chunk)
compressed_chunk
end
end
private
def write(*chunks)
chunks.sum do |chunk|
chunk = chunk.to_s
@compressed_chunk << chunk
chunk.bytesize
end
end
def compressed_chunk
@compressed_chunk.dup
ensure
@compressed_chunk.clear
end
end
class Inflater
def initialize(bytesize)
@inflater = Zlib::Inflate.new(Zlib::MAX_WBITS + 32)
@bytesize = bytesize
end
def call(chunk)
buffer = @inflater.inflate(chunk)
@bytesize -= chunk.bytesize
if @bytesize <= 0
buffer << @inflater.finish
@inflater.close
end
buffer
end
end
module_function
def encode(body)
Deflater.new(body)
end
def decode(response, bytesize: nil)
bytesize ||= response.headers.key?("content-length") ? response.headers["content-length"].to_i : Float::INFINITY
Inflater.new(bytesize)
end
end
end
end
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