code: function typeAndLength(buf) {
      var res, len, i;
  
      res = { type: buf[0], len: 0, header: 1 };
      if (buf[1] < 128) {
          // If bit 8 is zero, this byte indicates the content length (up to 127 bytes).
          res.len = buf[1];
          res.header += 1;
      } else {
          // If bit 8 is 1, bits 0 to 7 indicate the number of following legth bytes.
          // These bytes are a simple msb base-256 integer indicating the content length.
          for (i = 0; i < buf[1] - 128; i++) {
              res.len *= 256;
              res.len += buf[i + 2];
          }
          res.header += buf[1] - 128 + 1;
      }
      return res;
  }
docs: Functions to parse ASN.1 to native objects ----- Parse and return type, data length and header length.