code: public AsciiString decode(ByteBuf buf, int length) throws Http2Exception {
          processor.reset();
          buf.forEachByte(buf.readerIndex(), length, processor);
          buf.skipBytes(length);
          return processor.end();
      }
docs: Decompresses the given Huffman coded string literal.
  
  @param buf the string literal to be decoded
  @return the output stream for the compressed data
  @throws Http2Exception EOS Decoded