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// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
//! Windows-specific extensions to the primitives in the `std::ffi` module.
#![stable(feature = "rust1", since = "1.0.0")]
use ffi::{OsString, OsStr};
use sys::os_str::Buf;
use sys_common::wtf8::Wtf8Buf;
use sys_common::{FromInner, AsInner};
#[stable(feature = "rust1", since = "1.0.0")]
pub use sys_common::wtf8::EncodeWide;
/// Windows-specific extensions to `OsString`.
#[stable(feature = "rust1", since = "1.0.0")]
pub trait OsStringExt {
/// Creates an `OsString` from a potentially ill-formed UTF-16 slice of
/// 16-bit code units.
///
/// This is lossless: calling [`encode_wide`] on the resulting string
/// will always return the original code units.
///
/// # Examples
///
/// ```
/// use std::ffi::OsString;
/// use std::os::windows::prelude::*;
///
/// // UTF-16 encoding for "Unicode".
/// let source = [0x0055, 0x006E, 0x0069, 0x0063, 0x006F, 0x0064, 0x0065];
///
/// let string = OsString::from_wide(&source[..]);
/// ```
///
/// [`encode_wide`]: ./trait.OsStrExt.html#tymethod.encode_wide
#[stable(feature = "rust1", since = "1.0.0")]
fn from_wide(wide: &[u16]) -> Self;
}
#[stable(feature = "rust1", since = "1.0.0")]
impl OsStringExt for OsString {
fn from_wide(wide: &[u16]) -> OsString {
FromInner::from_inner(Buf { inner: Wtf8Buf::from_wide(wide) })
}
}
/// Windows-specific extensions to `OsStr`.
#[stable(feature = "rust1", since = "1.0.0")]
pub trait OsStrExt {
/// Re-encodes an `OsStr` as a wide character sequence, i.e. potentially
/// ill-formed UTF-16.
///
/// This is lossless: calling [`OsString::from_wide`] and then
/// `encode_wide` on the result will yield the original code units.
/// Note that the encoding does not add a final null terminator.
///
/// # Examples
///
/// ```
/// use std::ffi::OsString;
/// use std::os::windows::prelude::*;
///
/// // UTF-16 encoding for "Unicode".
/// let source = [0x0055, 0x006E, 0x0069, 0x0063, 0x006F, 0x0064, 0x0065];
///
/// let string = OsString::from_wide(&source[..]);
///
/// let result: Vec<u16> = string.encode_wide().collect();
/// assert_eq!(&source[..], &result[..]);
/// ```
///
/// [`OsString::from_wide`]: ./trait.OsStringExt.html#tymethod.from_wide
#[stable(feature = "rust1", since = "1.0.0")]
fn encode_wide(&self) -> EncodeWide;
}
#[stable(feature = "rust1", since = "1.0.0")]
impl OsStrExt for OsStr {
fn encode_wide(&self) -> EncodeWide {
self.as_inner().inner.encode_wide()
}
}
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