On Sun, May 26, 2019 at 11:30 AM Sergey Kamardin <[email protected]> wrote:
>
> func ReadHeader(r io.Reader) (Header, error) {
> var (
> b [16]byte
> bts []byte
> )
> h := (*reflect.SliceHeader)(unsafe.Pointer(&bts))
> *h = reflect.SliceHeader{
> Data: uintptr(unsafe.Pointer(&b)),
> Len: len(b),
> Cap: len(b),
> }
This is not valid. The rule is that SliceHeader is only valid when
inspecting an actual slice header. You have to write
h.Data = uintptr(unsafe.Pointer(&b))
h.Len = len(b)
h.Cap = len(b)
I assume this is reduced greatly from the real code, as you could also
just write
bts = b[:]
Ian
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