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