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use super::*;
/// A pointer to a constant null-terminated string of 16-bit Unicode characters.
#[repr(transparent)]
#[derive(Clone, Copy, PartialEq, Eq, Debug)]
pub struct PCWSTR(pub *const u16);
impl PCWSTR {
/// Construct a new `PCWSTR` from a raw pointer
pub const fn from_raw(ptr: *const u16) -> Self {
Self(ptr)
}
/// Construct a null `PCWSTR`
pub const fn null() -> Self {
Self(core::ptr::null())
}
/// Returns a raw pointer to the `PCWSTR`
pub const fn as_ptr(&self) -> *const u16 {
self.0
}
/// Checks whether the `PCWSTR` is null
pub fn is_null(&self) -> bool {
self.0.is_null()
}
/// String length without the trailing 0
///
/// # Safety
///
/// The `PCWSTR`'s pointer needs to be valid for reads up until and including the next `\0`.
pub unsafe fn len(&self) -> usize {
extern "C" {
fn wcslen(s: *const u16) -> usize;
}
unsafe { wcslen(self.0) }
}
/// Returns `true` if the string length is zero, and `false` otherwise.
///
/// # Safety
///
/// The `PCWSTR`'s pointer needs to be valid for reads up until and including the next `\0`.
pub unsafe fn is_empty(&self) -> bool {
unsafe { self.len() == 0 }
}
/// String data without the trailing 0
///
/// # Safety
///
/// The `PCWSTR`'s pointer needs to be valid for reads up until and including the next `\0`.
pub unsafe fn as_wide(&self) -> &[u16] {
unsafe { core::slice::from_raw_parts(self.0, self.len()) }
}
/// Copy the `PCWSTR` into a Rust `String`.
///
/// # Safety
///
/// See the safety information for `PCWSTR::as_wide`.
pub unsafe fn to_string(&self) -> core::result::Result<String, alloc::string::FromUtf16Error> {
unsafe { String::from_utf16(self.as_wide()) }
}
/// Copy the `PCWSTR` into an `HSTRING`.
///
/// # Safety
///
/// See the safety information for `PCWSTR::as_wide`.
pub unsafe fn to_hstring(&self) -> HSTRING {
unsafe { HSTRING::from_wide(self.as_wide()) }
}
/// Allow this string to be displayed.
///
/// # Safety
///
/// See the safety information for `PCWSTR::as_wide`.
pub unsafe fn display(&self) -> impl core::fmt::Display + '_ {
unsafe { Decode(move || core::char::decode_utf16(self.as_wide().iter().cloned())) }
}
}
impl AsRef<PCWSTR> for PCWSTR {
fn as_ref(&self) -> &Self {
self
}
}