sed data
         (excluding any dictionary data) computed according to Adler-32
         algorithm. This algorithm is a 32-bit extension and improvement
         of the Fletcher algorithm, used in the ITU-T X.224 / ISO 8073
         standard. See references [<a href="#ref-4" title="&quot;An Arithmetic Checksum for Serial Transmissions,&quot;">4</a>] and [<a href="#ref-5" title="&quot;Checksum Algorithms,&quot;">5</a>] in Chapter 3, below)

         Adler-32 is composed of two sums accumulated per byte: s1 