+//! The underlying OsString/OsStr implementation on Unix and many other
+//! systems: just a `Vec<u8>`/`[u8]`.
+
+use crate::borrow::Cow;
+use crate::ffi::{OsStr, OsString};
+use crate::fmt;
+use crate::str;
+use crate::mem;
+use crate::rc::Rc;
+use crate::sync::Arc;
+use crate::sys_common::{FromInner, IntoInner, AsInner};
+use crate::sys_common::bytestring::debug_fmt_bytestring;
+
+use core::str::lossy::Utf8Lossy;
+
+#[derive(Clone, Hash)]
+pub(crate) struct Buf {
+ pub inner: Vec<u8>
+}
+
+pub(crate) struct Slice {
+ pub inner: [u8]
+}
+
+impl fmt::Debug for Slice {
+ fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+ debug_fmt_bytestring(&self.inner, formatter)
+ }
+}
+
+impl fmt::Display for Slice {
+ fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+ fmt::Display::fmt(&Utf8Lossy::from_bytes(&self.inner), formatter)
+ }
+}
+
+impl fmt::Debug for Buf {
+ fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+ fmt::Debug::fmt(self.as_slice(), formatter)
+ }
+}
+
+impl fmt::Display for Buf {
+ fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+ fmt::Display::fmt(self.as_slice(), formatter)
+ }
+}
+
+impl IntoInner<Vec<u8>> for Buf {
+ fn into_inner(self) -> Vec<u8> {
+ self.inner
+ }
+}
+
+impl AsInner<[u8]> for Buf {
+ fn as_inner(&self) -> &[u8] {
+ &self.inner
+ }
+}
+
+
+impl Buf {
+ pub fn from_string(s: String) -> Buf {
+ Buf { inner: s.into_bytes() }
+ }
+
+ #[inline]
+ pub fn with_capacity(capacity: usize) -> Buf {
+ Buf {
+ inner: Vec::with_capacity(capacity)
+ }
+ }
+
+ #[inline]
+ pub fn clear(&mut self) {
+ self.inner.clear()
+ }
+
+ #[inline]
+ pub fn capacity(&self) -> usize {
+ self.inner.capacity()
+ }
+
+ #[inline]
+ pub fn reserve(&mut self, additional: usize) {
+ self.inner.reserve(additional)
+ }
+
+ #[inline]
+ pub fn reserve_exact(&mut self, additional: usize) {
+ self.inner.reserve_exact(additional)
+ }
+
+ #[inline]
+ pub fn shrink_to_fit(&mut self) {
+ self.inner.shrink_to_fit()
+ }
+
+ #[inline]
+ pub fn shrink_to(&mut self, min_capacity: usize) {
+ self.inner.shrink_to(min_capacity)
+ }
+
+ pub fn as_slice(&self) -> &Slice {
+ unsafe { mem::transmute(&*self.inner) }
+ }
+
+ pub fn into_string(self) -> Result<String, Buf> {
+ String::from_utf8(self.inner).map_err(|p| Buf { inner: p.into_bytes() } )
+ }
+
+ pub fn push_slice(&mut self, s: &Slice) {
+ self.inner.extend_from_slice(&s.inner)
+ }
+
+ #[inline]
+ pub fn into_box(self) -> Box<Slice> {
+ unsafe { mem::transmute(self.inner.into_boxed_slice()) }
+ }
+
+ #[inline]
+ pub fn from_box(boxed: Box<Slice>) -> Buf {
+ let inner: Box<[u8]> = unsafe { mem::transmute(boxed) };
+ Buf { inner: inner.into_vec() }
+ }
+
+ #[inline]
+ pub fn into_arc(&self) -> Arc<Slice> {
+ self.as_slice().into_arc()
+ }
+
+ #[inline]
+ pub fn into_rc(&self) -> Rc<Slice> {
+ self.as_slice().into_rc()
+ }
+}
+
+impl Slice {
+ fn from_u8_slice(s: &[u8]) -> &Slice {
+ unsafe { mem::transmute(s) }
+ }
+
+ pub fn from_str(s: &str) -> &Slice {
+ Slice::from_u8_slice(s.as_bytes())
+ }
+
+ pub fn to_str(&self) -> Option<&str> {
+ str::from_utf8(&self.inner).ok()
+ }
+
+ pub fn to_string_lossy(&self) -> Cow<str> {
+ String::from_utf8_lossy(&self.inner)
+ }
+
+ pub fn to_owned(&self) -> Buf {
+ Buf { inner: self.inner.to_vec() }
+ }
+
+ #[inline]
+ pub fn into_box(&self) -> Box<Slice> {
+ let boxed: Box<[u8]> = self.inner.into();
+ unsafe { mem::transmute(boxed) }
+ }
+
+ pub fn empty_box() -> Box<Slice> {
+ let boxed: Box<[u8]> = Default::default();
+ unsafe { mem::transmute(boxed) }
+ }
+
+ #[inline]
+ pub fn into_arc(&self) -> Arc<Slice> {
+ let arc: Arc<[u8]> = Arc::from(&self.inner);
+ unsafe { Arc::from_raw(Arc::into_raw(arc) as *const Slice) }
+ }
+
+ #[inline]
+ pub fn into_rc(&self) -> Rc<Slice> {
+ let rc: Rc<[u8]> = Rc::from(&self.inner);
+ unsafe { Rc::from_raw(Rc::into_raw(rc) as *const Slice) }
+ }
+}
+
+/// Platform-specific extensions to [`OsString`].
+///
+/// [`OsString`]: ../../../../std/ffi/struct.OsString.html
+#[stable(feature = "rust1", since = "1.0.0")]
+pub trait OsStringExt {
+ /// Creates an [`OsString`] from a byte vector.
+ ///
+ /// See the module docmentation for an example.
+ ///
+ /// [`OsString`]: ../../../ffi/struct.OsString.html
+ #[stable(feature = "rust1", since = "1.0.0")]
+ fn from_vec(vec: Vec<u8>) -> Self;
+
+ /// Yields the underlying byte vector of this [`OsString`].
+ ///
+ /// See the module docmentation for an example.
+ ///
+ /// [`OsString`]: ../../../ffi/struct.OsString.html
+ #[stable(feature = "rust1", since = "1.0.0")]
+ fn into_vec(self) -> Vec<u8>;
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl OsStringExt for OsString {
+ fn from_vec(vec: Vec<u8>) -> OsString {
+ FromInner::from_inner(Buf { inner: vec })
+ }
+ fn into_vec(self) -> Vec<u8> {
+ self.into_inner().inner
+ }
+}
+
+/// Platform-specific extensions to [`OsStr`].
+///
+/// [`OsStr`]: ../../../../std/ffi/struct.OsStr.html
+#[stable(feature = "rust1", since = "1.0.0")]
+pub trait OsStrExt {
+ #[stable(feature = "rust1", since = "1.0.0")]
+ /// Creates an [`OsStr`] from a byte slice.
+ ///
+ /// See the module docmentation for an example.
+ ///
+ /// [`OsStr`]: ../../../ffi/struct.OsStr.html
+ fn from_bytes(slice: &[u8]) -> &Self;
+
+ /// Gets the underlying byte view of the [`OsStr`] slice.
+ ///
+ /// See the module docmentation for an example.
+ ///
+ /// [`OsStr`]: ../../../ffi/struct.OsStr.html
+ #[stable(feature = "rust1", since = "1.0.0")]
+ fn as_bytes(&self) -> &[u8];
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl OsStrExt for OsStr {
+ fn from_bytes(slice: &[u8]) -> &OsStr {
+ unsafe { mem::transmute(slice) }
+ }
+ fn as_bytes(&self) -> &[u8] {
+ &self.as_inner().inner
+ }
+}