Function computeNewHighWaterMark

lib/internal/streams/readable.js:620–635

(n)

// Don't raise the hwm > 1GB.
const MAX_HWM = 0x40000000;
function computeNewHighWaterMark(n) {
  if (n > MAX_HWM) {
    throw new ERR_OUT_OF_RANGE('size', '<= 1GiB', n);
  } else {
    // Get the next highest power of 2 to prevent increasing hwm excessively in
    // tiny amounts.
    n--;
    n |= n >>> 1;
    n |= n >>> 2;
    n |= n >>> 4;
    n |= n >>> 8;
    n |= n >>> 16;
    n++;
  }
  return n;
}

// This function is designed to be inlinable, so please take care when making
// changes to the function body.