121 lines
3.8 KiB
Rust
121 lines
3.8 KiB
Rust
// Allow uppercase names to match Windows API:
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#![allow(clippy::upper_case_acronyms)]
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#[cfg(windows)]
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mod os_defs {
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pub use winapi::shared::{
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ntdef::{HRESULT, LPCSTR, LPCWSTR, LPSTR, LPWSTR, WCHAR},
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wtypes::BSTR,
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};
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pub use winapi::um::combaseapi::CoTaskMemFree;
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pub use winapi::um::oleauto::{SysFreeString, SysStringLen};
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}
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#[cfg(not(windows))]
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mod os_defs {
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pub type CHAR = std::os::raw::c_char;
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pub type UINT = u32;
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pub type WCHAR = widestring::WideChar;
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pub type OLECHAR = WCHAR;
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pub type LPSTR = *mut CHAR;
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pub type LPWSTR = *mut WCHAR;
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pub type LPCSTR = *const CHAR;
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pub type LPCWSTR = *const WCHAR;
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pub type BSTR = *mut OLECHAR;
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pub type LPBSTR = *mut BSTR;
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pub type HRESULT = i32;
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/// Returns a mutable pointer to the length prefix of the string
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fn len_ptr(p: BSTR) -> *mut UINT {
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// The first four bytes before the pointer contain the length prefix:
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// https://docs.microsoft.com/en-us/previous-versions/windows/desktop/automat/bstr#remarks
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unsafe { p.cast::<UINT>().offset(-1) }
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}
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#[allow(non_snake_case)]
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/// # Safety
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/// `p` must be a valid pointer to an allocation made with `malloc`, or null.
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pub unsafe fn CoTaskMemFree(p: *mut libc::c_void) {
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// https://github.com/microsoft/DirectXShaderCompiler/blob/56e22b30c5e43632f56a1f97865f37108ec35463/include/dxc/Support/WinAdapter.h#L46
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if !p.is_null() {
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libc::free(p)
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}
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}
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#[allow(non_snake_case)]
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/// # Safety
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/// `p` must be a valid pointer to an allocation made with `malloc`, or null.
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pub unsafe fn SysFreeString(p: BSTR) {
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// https://github.com/microsoft/DirectXShaderCompiler/blob/56e22b30c5e43632f56a1f97865f37108ec35463/lib/DxcSupport/WinAdapter.cpp#L50-L53
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if !p.is_null() {
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libc::free(len_ptr(p).cast::<_>())
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}
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}
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#[allow(non_snake_case)]
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/// Returns the size of `p` in bytes, excluding terminating NULL character
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///
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/// # Safety
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/// `p` must be a valid pointer to a [`BSTR`] with size-prefix in the `4` leading bytes, or null.
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///
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/// https://docs.microsoft.com/en-us/previous-versions/windows/desktop/automat/bstr#remarks
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pub unsafe fn SysStringByteLen(p: BSTR) -> UINT {
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if p.is_null() {
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0
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} else {
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*len_ptr(p)
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}
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}
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#[allow(non_snake_case)]
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/// Returns the size of `p` in characters, excluding terminating NULL character
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///
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/// # Safety
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/// `p` must be a valid pointer to a [`BSTR`] with size-prefix in the `4` leading bytes, or null.
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///
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/// https://docs.microsoft.com/en-us/previous-versions/windows/desktop/automat/bstr#remarks
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pub unsafe fn SysStringLen(p: BSTR) -> UINT {
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SysStringByteLen(p) / std::mem::size_of::<OLECHAR>() as UINT
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}
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}
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pub use os_defs::*;
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#[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
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#[repr(transparent)]
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#[must_use]
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pub struct HRESULT(pub os_defs::HRESULT);
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impl HRESULT {
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pub fn is_err(&self) -> bool {
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self.0 < 0
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}
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}
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impl From<i32> for HRESULT {
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fn from(v: i32) -> Self {
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Self(v)
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}
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}
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impl std::fmt::Debug for HRESULT {
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fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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<Self as std::fmt::Display>::fmt(self, f)
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}
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}
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impl std::fmt::Display for HRESULT {
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fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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f.write_fmt(format_args!("{:#x}", self))
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}
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}
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impl std::fmt::LowerHex for HRESULT {
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fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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let prefix = if f.alternate() { "0x" } else { "" };
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let bare_hex = format!("{:x}", self.0.abs());
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// https://stackoverflow.com/a/44712309
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f.pad_integral(self.0 >= 0, prefix, &bare_hex)
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// <i32 as std::fmt::LowerHex>::fmt(&self.0, f)
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}
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}
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