Coverage Report

Created: 2025-05-07 06:59

/rust/registry/src/index.crates.io-6f17d22bba15001f/ring-0.17.14/src/polyfill.rs
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// Copyright 2015-2016 Brian Smith.
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice appear in all copies.
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//
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// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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// SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
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// OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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// CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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//! Polyfills for functionality that will (hopefully) be added to Rust's
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//! standard library soon.
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#[cfg(any(target_pointer_width = "32", target_pointer_width = "64"))]
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#[inline(always)]
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pub const fn u64_from_usize(x: usize) -> u64 {
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    x as u64
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}
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#[cfg(any(target_pointer_width = "32", target_pointer_width = "64"))]
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pub const fn usize_from_u32(x: u32) -> usize {
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    x as usize
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}
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#[cfg(all(
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    target_arch = "aarch64",
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    target_endian = "little",
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    target_pointer_width = "64"
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))]
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#[allow(clippy::cast_possible_truncation)]
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pub fn usize_from_u64(x: u64) -> usize {
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    x as usize
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}
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/// const-capable `x.try_into().unwrap_or(usize::MAX)`
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#[allow(clippy::cast_possible_truncation)]
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#[inline(always)]
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pub const fn usize_from_u64_saturated(x: u64) -> usize {
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    const USIZE_MAX: u64 = u64_from_usize(usize::MAX);
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    if x < USIZE_MAX {
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        x as usize
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    } else {
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        usize::MAX
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    }
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}
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#[macro_use]
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mod cold_error;
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mod array_flat_map;
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mod array_split_map;
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pub mod cstr;
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pub mod sliceutil;
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#[cfg(feature = "alloc")]
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mod leading_zeros_skipped;
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#[cfg(any(
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    all(target_arch = "aarch64", target_endian = "little"),
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    all(target_arch = "arm", target_endian = "little"),
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    target_arch = "x86",
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    target_arch = "x86_64"
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))]
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pub mod once_cell {
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    pub mod race;
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}
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mod notsend;
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pub mod ptr;
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pub mod slice;
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#[cfg(test)]
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mod test;
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mod unwrap_const;
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pub use self::{
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    array_flat_map::ArrayFlatMap, array_split_map::ArraySplitMap, notsend::NotSend,
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    unwrap_const::unwrap_const,
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};
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#[cfg(feature = "alloc")]
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pub use leading_zeros_skipped::LeadingZerosStripped;
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#[cfg(test)]
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mod tests {
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    use super::*;
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    #[test]
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    fn test_usize_from_u64_saturated() {
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        const USIZE_MAX: u64 = u64_from_usize(usize::MAX);
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        assert_eq!(usize_from_u64_saturated(u64::MIN), usize::MIN);
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        assert_eq!(usize_from_u64_saturated(USIZE_MAX), usize::MAX);
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        assert_eq!(usize_from_u64_saturated(USIZE_MAX - 1), usize::MAX - 1);
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        #[cfg(not(target_pointer_width = "64"))]
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        {
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            assert_eq!(usize_from_u64_saturated(USIZE_MAX + 1), usize::MAX);
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        }
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    }
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}