if d.img1 == nil && d.img3 == nil {
		d.makeImg(mxx, myy)
	}
	if d.progressive {
		for i := 0; i < nComp; i++ {
			compIndex := scan[i].compIndex
			if d.progCoeffs[compIndex] == nil {
				d.progCoeffs[compIndex] = make([]block, mxx*myy*d.comp[compIndex].h*d.comp[compIndex].v)
			}
		}
	}

	d.bits = bits{}
	mcu, expectedRST := 0, uint8(rst0Marker)
	var (

	// than specified in request header.
	if n < data.Size() {
		return ObjectInfo{}, IncompleteBody{Bucket: bucket, Object: object}
	}

	var compIndex []byte
	if opts.IndexCB != nil {
		compIndex = opts.IndexCB()
	}
	if !opts.NoLock {
		lk := er.NewNSLock(bucket, object)
		lkctx, err := lk.GetLock(ctx, globalOperationTimeout)
		if err != nil {
			return ObjectInfo{}, err