text: 'use strict';
  
  // Note: adler32 takes 12% for level 0 and 2% for level 6.
  // It doesn't worth to make additional optimizationa as in original.
  // Small size is preferable.
  
  function adler32(adler, buf, len, pos) {
    var s1 = (adler & 0xffff) |0,
        s2 = ((adler >>> 16) & 0xffff) |0,
        n = 0;
  
    while (len !== 0) {
      // Set limit ~ twice less than 5552, to keep
      // s2 in 31-bits, because we force signed ints.
      // in other case %= will fail.
      n = len > 2000 ? 2000 : len;
      len -= n;
  
      do {
        s1 = (s1 + buf[pos++]) |0;
        s2 = (s2 + s1) |0;
      } while (--n);
  
      s1 %= 65521;
      s2 %= 65521;
    }
  
    return (s1 | (s2 << 16)) |0;
  }
  
  
  module.exports = adler32;
  