}

  function handleWheel(e) {
    if (e.deltaY == 0) return;
    // Change scale factor by 1.1 or 1/1.1
    rescale(currentScale * (e.deltaY < 0 ? 1.1 : (1/1.1)),
            toSvg(e.offsetX, e.offsetY));
  }

  function setMode(m) {
    mode = m;
    touchid = null;
    touchid2 = null;
  }

  function panStart(x, y) {
    moved = false;
    panLastX = x;
    panLastY = y;
  }

	}

	// check invariants
	const xsize = fsize + 5
	for offset := -xsize; offset < xsize; offset++ {
		want1 := f.Offset(Pos(f.base + offset))
		if got := f.Offset(f.Pos(offset)); got != want1 {
			t.Errorf("offset = %d, want %d", got, want1)
		}

		want2 := f.Pos(offset)
		if got := f.Pos(f.Offset(want2)); got != want2 {
			t.Errorf("pos = %d, want %d", got, want2)
		}
	}

	if i := len(f.infos); (i == 0 || f.infos[i-1].Offset < offset) && offset < f.size {
		f.infos = append(f.infos, lineInfo{offset, filename, line, column})
	}
	f.mutex.Unlock()
}

// fixOffset fixes an out-of-bounds offset such that 0 <= offset <= f.size.
func (f *File) fixOffset(offset int) int {
	switch {
	case offset < 0:
		if !debug {
			return 0
		}
	case offset > f.size:
		if !debug {
			return f.size

	h.Offsets[goobj.BlkNonpkgdef] = w.Offset()
	for _, s := range ctxt.nonpkgdefs {
		w.Sym(s)
	}

	// Non-pkg symbol references
	h.Offsets[goobj.BlkNonpkgref] = w.Offset()
	for _, s := range ctxt.nonpkgrefs {
		w.Sym(s)
	}

	// Referenced package symbol flags
	h.Offsets[goobj.BlkRefFlags] = w.Offset()
	w.refFlags()

	// Hashes
	h.Offsets[goobj.BlkHash64] = w.Offset()

	return int(r.h.Offsets[BlkHashed64def+1]-r.h.Offsets[BlkHashed64def]) / SymSize
}

func (r *Reader) NHasheddef() int {
	return int(r.h.Offsets[BlkHasheddef+1]-r.h.Offsets[BlkHasheddef]) / SymSize
}

func (r *Reader) NNonpkgdef() int {
	return int(r.h.Offsets[BlkNonpkgdef+1]-r.h.Offsets[BlkNonpkgdef]) / SymSize
}

func (r *Reader) NNonpkgref() int {

	// issue 67470
	{"-07", "-25", "time zone offset hour out of range"},
	{"-07:00", "+25:00", "time zone offset hour out of range"},
	{"-07:00", "-23:61", "time zone offset minute out of range"},
	{"-07:00:00", "+23:59:61", "time zone offset second out of range"},
	{"Z07", "-25", "time zone offset hour out of range"},
	{"Z07:00", "+25:00", "time zone offset hour out of range"},

// and treat the offset as an identifier. We use negative offsets that
// do not overlap with any compile-time module offsets.
//
// Entries are created by reflect.addReflectOff.
var reflectOffs struct {
	lock mutex
	next int32
	m    map[int32]unsafe.Pointer
	minv map[unsafe.Pointer]int32
}

func reflectOffsLock() {
	lock(&reflectOffs.lock)
	if raceenabled {

	}

	// To generate random offset/length.
	r := rand.New(rand.NewSource(UTCNow().UnixNano()))

	buf := &bytes.Buffer{}

	// Verify erasure.Decode() for random offsets and lengths.
	for i := 0; i < iterations; i++ {
		offset := r.Int63n(length)
		readLen := r.Int63n(length - offset)

		expected := data[offset : offset+readLen]

		// Get the checksums of the current part.

			vars:        make(map[string]*asmVar),
			varByOffset: make(map[int]*asmVar),
		}
		offset = 0
		addParams(decl.Type.Params.List, false)
		if decl.Type.Results != nil && len(decl.Type.Results.List) > 0 {
			offset += -offset & (arch.maxAlign - 1)
			addParams(decl.Type.Results.List, true)
		}
		fn.size = offset
		m[arch.name] = fn
	}

	return m
}

	}
	for i, m := range methods {
		m.Offset = int64(i) * int64(PtrSize)
	}

	t.SetAllMethods(methods)
}

// calcStructOffset computes the offsets of a sequence of fields,
// starting at the given offset. It returns the resulting offset and
// maximum field alignment.
func calcStructOffset(t *Type, fields []*Field, offset int64) int64 {
	for _, f := range fields {
		CalcSize(f.Type)