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// SPDX-License-Identifier: Unlicense OR MIT
package unsafe
import (
"reflect"
"unsafe"
)
// BytesView returns a byte slice view of a slice.
func BytesView(s interface{}) []byte {
v := reflect.ValueOf(s)
first := v.Index(0)
sz := int(first.Type().Size())
return *(*[]byte)(unsafe.Pointer(&reflect.SliceHeader{
Data: uintptr(unsafe.Pointer((*reflect.SliceHeader)(unsafe.Pointer(first.UnsafeAddr())))),
Len: v.Len() * sz,
Cap: v.Cap() * sz,
}))
}
// SliceOf returns a slice from a (native) pointer.
func SliceOf(s uintptr) []byte {
if s == 0 {
return nil
}
sh := reflect.SliceHeader{
Data: s,
Len: 1 << 30,
Cap: 1 << 30,
}
return *(*[]byte)(unsafe.Pointer(&sh))
}
// GoString convert a NUL-terminated C string
// to a Go string.
func GoString(s []byte) string {
i := 0
for {
if s[i] == 0 {
break
}
i++
}
return string(s[:i])
}
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