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# frozen-string-literal: true
using Plum::BinaryString
module Plum
module HPACK
module Huffman
extend self
# Static-Huffman-encodes the specified String.
def encode(bytestr)
out = String.new
bytestr.each_byte do |b|
out << HUFFMAN_TABLE[b]
end
out << "1" * ((8 - out.bytesize) % 8)
[out].pack("B*")
end
# Static-Huffman-decodes the specified String.
def decode(encoded)
bits = encoded.unpack("B*")[0]
out = []
buf = String.new
bits.each_char do |cb|
buf << cb
if c = HUFFMAN_TABLE_INVERSED[buf]
raise HPACKError.new("huffman: EOS detected") if c == 256
out << c
buf.clear
end
end
if buf.bytesize > 7
raise HPACKError.new("huffman: padding is too large (> 7 bits)")
elsif buf != "1" * buf.bytesize
raise HPACKError.new("huffman: unknown suffix: #{buf}")
else
out.pack("C*")
end
end
end
end
end
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