func hash4(b []byte) uint32 {
	return ((uint32(b[3]) | uint32(b[2])<<8 | uint32(b[1])<<16 | uint32(b[0])<<24) * hashmul) >> (32 - hashBits)
}

// bulkHash4 will compute hashes using the same
// algorithm as hash4.
func bulkHash4(b []byte, dst []uint32) {
	if len(b) < minMatchLength {
		return
	}
	hb := uint32(b[3]) | uint32(b[2])<<8 | uint32(b[1])<<16 | uint32(b[0])<<24

	hdr := make([]byte, n)
	copy(hdr, hdrPrefix)
	*(*uint32)(unsafe.Pointer(&hdr[np])) = uint32(n)
	copy(hdr[np+4:], meta)
	return hdr, nil
}

func (m *mappedFile) place(limit uint32, name string) (start, end uint32) {
	if limit == 0 {
		// first record in file
		limit = m.hdrLen + hashOff + 4*numHash
	}
	n := round(uint32(16+len(name)), recordUnit)

func libfuzzerTraceCmp1(uint8, uint8, uint)
func libfuzzerTraceCmp2(uint16, uint16, uint)
func libfuzzerTraceCmp4(uint32, uint32, uint)
func libfuzzerTraceCmp8(uint64, uint64, uint)
func libfuzzerTraceConstCmp1(uint8, uint8, uint)
func libfuzzerTraceConstCmp2(uint16, uint16, uint)
func libfuzzerTraceConstCmp4(uint32, uint32, uint)
func libfuzzerTraceConstCmp8(uint64, uint64, uint)
func libfuzzerHookStrCmp(string, string, uint)

// https://lemire.me/blog/2016/06/30/fast-random-shuffling
func (r *Rand) int31n(n int32) int32 {
	v := r.Uint32()
	prod := uint64(v) * uint64(n)
	low := uint32(prod)
	if low < uint32(n) {
		thresh := uint32(-n) % uint32(n)
		for low < thresh {
			v = r.Uint32()
			prod = uint64(v) * uint64(n)
			low = uint32(prod)
		}
	}
	return int32(prod >> 32)
}

	runtimeCtx uintptr
	mode       int32

	// fields used only by net package
	fd     *FD
	buf    syscall.WSABuf
	msg    windows.WSAMsg
	sa     syscall.Sockaddr
	rsa    *syscall.RawSockaddrAny
	rsan   int32
	handle syscall.Handle
	flags  uint32
	qty    uint32
	bufs   []syscall.WSABuf
}

func (o *operation) InitBuf(buf []byte) {
	o.buf.Len = uint32(len(buf))
	o.buf.Buf = nil
	if len(buf) != 0 {

// the signal handler is currently set to the Go signal handler or not.
// This is uint32 rather than bool so that we can use atomic instructions.
var handlingSig [_NSIG]uint32

// channels for synchronizing signal mask updates with the signal mask
// thread
var (
	disableSigChan  chan uint32
	enableSigChan   chan uint32
	maskUpdatedChan chan struct{}
)

func init() {

			w.Uint32(naux)
			naux += uint32(nAuxSym(s))
		}
	}
	w.Uint32(naux)

	// Data indexes
	h.Offsets[goobj.BlkDataIdx] = w.Offset()
	dataOff := int64(0)
	for _, list := range lists {
		for _, s := range list {
			w.Uint32(uint32(dataOff))
			dataOff += int64(len(s.P))
			if file := s.File(); file != nil {
				dataOff += int64(file.Size)
			}
		}
	}
	if int64(uint32(dataOff)) != dataOff {

	SetNonblock(1, true)
	SetNonblock(2, true)
}

type uintptr32 = uint32
type size = uint32
type fdflags = uint32
type filesize = uint64
type filetype = uint8
type lookupflags = uint32
type oflags = uint32
type rights = uint64
type timestamp = uint64
type dircookie = uint64
type filedelta = int64
type fstflags = uint32

type iovec struct {
	buf    uintptr32
	bufLen size
}

const (

type reader struct {
	br           bitReader
	fileCRC      uint32
	blockCRC     uint32
	wantBlockCRC uint32
	setupDone    bool // true if we have parsed the bzip2 header.
	eof          bool
	blockSize    int       // blockSize in bytes, i.e. 900 * 1000.
	c            [256]uint // the ``C'' array for the inverse BWT.

	pcdelta := uint32(p[0])
	n = 1
	if pcdelta&0x80 != 0 {
		n, pcdelta = readvarint(p)
	}
	p = p[n:]
	*pc += uintptr(pcdelta * sys.PCQuantum)
	return p, true
}

// readvarint reads a varint from p.
func readvarint(p []byte) (read uint32, val uint32) {
	var v, shift, n uint32
	for {
		b := p[n]
		n++
		v |= uint32(b&0x7F) << (shift & 31)
		if b&0x80 == 0 {
			break
		}