Add TryFromBytes prefix/suffix conversion methods
#1072
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joshlf
requested changes
May 2, 2024
jswrenn
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May 7, 2024
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| match Ptr::from_ref(candidate).try_cast_into_no_leftover::<Self>() { | ||
| Ok(candidate) => { | ||
| // This call may panic. If that happens, it doesn't cause any soundness | ||
| // issues, as we have not generated any invalid state which we need to | ||
| // fix before returning. | ||
| // | ||
| // Note that one panic or post-monomorphization error condition is | ||
| // calling `try_into_valid` (and thus `is_bit_valid`) with a shared | ||
| // pointer when `Self: !Immutable`. Since `Self: Immutable`, this panic | ||
| // condition will not happen. | ||
| match candidate.try_into_valid() { | ||
| Ok(valid) => Ok(valid.as_ref()), | ||
| Err(e) => Err(e.map_src(|src| src.as_bytes().as_ref()).into()), | ||
| } | ||
| } | ||
| Err(e) => Err(e.map_src(Ptr::as_ref).into()), | ||
| } |
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Rewritten in this manner for consistency with our other from_ref methods, and because doing so allows us to name try_ref_from's argument "candidate" without thinking of new, weird identifier names.
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@joshlf Need to write a commit message, but otherwise this is ready for review. This PR intentionally omits prefix/suffix-returning versions of |
joshlf
requested changes
May 8, 2024
src/lib.rs
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| /// [here][TryFromBytes#what-is-a-valid-instance] for a discussion of how | ||
| /// these cases are handled. | ||
| /// If the bytes of `candidate` are a valid instance of `Self`, this method | ||
| /// returns a reference to those bytes interpreted as `Self`. If |
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| /// returns a reference to those bytes interpreted as `Self`. If | |
| /// returns a reference to those bytes reinterpreted as a `Self`. If |
src/lib.rs
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| /// | ||
| /// If the first `size_of::<Self>()` bytes of `candidate` are a valid | ||
| /// instance of `Self`, this method returns both a reference to those bytes | ||
| /// interpreted as `Self`, and a reference to the remaining bytes. If |
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| /// interpreted as `Self`, and a reference to the remaining bytes. If | |
| /// reinterpreted as a `Self`, and a reference to the remaining bytes. If |
src/lib.rs
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| /// | ||
| /// If the last `size_of::<Self>()` bytes of `candidate` are a valid | ||
| /// instance of `Self`, this method returns both a reference to those bytes | ||
| /// interpreted as `Self`, and a reference to the preceding bytes. If |
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| /// interpreted as `Self`, and a reference to the preceding bytes. If | |
| /// reinterpreted as a `Self`, and a reference to the preceding bytes. If |
src/lib.rs
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| /// | ||
| /// If the bytes of `candidate` are a valid instance of `Self`, reads those | ||
| /// bytes as `Self`. If `candidate.len() < size_of::<Self>()` or `candidate` | ||
| /// is not aligned to `align_of::<Self>()` or the bytes are not a valid |
Makes progress towards #5
joshlf
approved these changes
May 9, 2024
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