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Remove new unsafe {} use.

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Rationale: this helps for performance only, but we don't actually
have any reason to think that the checks here are
performance-critical.  Let's not normalize the use of unsafe {}.
This commit is contained in:
Nick Mathewson 2018-02-08 17:26:26 -05:00
parent 8d142e2322
commit d8307cb0e9
2 changed files with 9 additions and 12 deletions
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12
src/rust/protover/ffi.rs
View File

@ -149,13 +149,11 @@ pub extern "C" fn protover_get_supported_protocols() -> *const c_char {
// programming error.
assert!(byte_slice_is_c_like(SUPPORTED_PROTOCOLS));
// It's okay to call the "unchecked" version of the function because
// It's okay to unwrap the result of this function because
// we can see that the bytes we're passing into it 1) are valid UTF-8,
// 2) have no intermediate NUL bytes, and 3) are terminated with a NUL
// byte.
unsafe {
supported = CStr::from_bytes_with_nul_unchecked(SUPPORTED_PROTOCOLS);
}
supported = CStr::from_bytes_with_nul(SUPPORTED_PROTOCOLS).unwrap();
supported.as_ptr()
}
@ -230,13 +228,11 @@ pub extern "C" fn protover_compute_for_old_tor(version: *const c_char) -> *const
// programming error.
assert!(byte_slice_is_c_like(elder_protocols));
// It's okay to call the "unchecked" version of the function because
// It's okay to unwrap the result of this function because
// we can see that the bytes we're passing into it 1) are valid UTF-8,
// 2) have no intermediate NUL bytes, and 3) are terminated with a NUL
// byte.
unsafe {
supported = CStr::from_bytes_with_nul_unchecked(elder_protocols);
}
supported = CStr::from_bytes_with_nul(elder_protocols).unwrap();
supported.as_ptr()
}

9
src/rust/protover/protover.rs
View File

@ -106,10 +106,11 @@ impl FromStr for Proto {
/// "HSDir=1-1 LinkAuth=1"
///
pub fn get_supported_protocols() -> &'static str {
unsafe {
// The `len() - 1` is to remove the NUL byte.
str::from_utf8_unchecked(&SUPPORTED_PROTOCOLS[..SUPPORTED_PROTOCOLS.len() - 1])
}
// The `len() - 1` is to remove the NUL byte.
// The `unwrap` is safe becauase we SUPPORTED_PROTOCOLS is under
// our control.
str::from_utf8(&SUPPORTED_PROTOCOLS[..SUPPORTED_PROTOCOLS.len() - 1])
.unwrap()
}
/// Translates a vector representation of a protocol list into a HashMap