nl_tokens: / * @see http : // www . w3 . org / TR / PNG - Chunks . html
pl_tokens: function createZlibHeader ( bytes , level ) { /*
       * @see http://www.ietf.org/rfc/rfc1950.txt for zlib header
       */ var cm = 8 ; var cinfo = Math . LOG2E * Math . <mask> ( 0x8000 ) - 8 ; var cmf = cinfo << 4 | cm ; var hdr = cmf << 8 ; var flevel = Math . min ( 3 , ( level - 1 & 0xff ) >> 1 ) ; hdr |= flevel << 6 ; hdr |= 0 ; //FDICT hdr += 31 - hdr % 31 ; return [ cmf , hdr & 0xff & 0xff ] ; }