Comments (3)
Thanks for the suggestion!
The to_bytes
conversion is simple. We can just generate:
fn to_bytes(&self) -> &[u8] { &self.data }
The from_bytes
conversion is actually the annoying one since we may have to consider bitfield structs that might contain invalid bit sets. For example this could be well introduced with the feature to support non-powers-of-two enum bit specifiers.
Also it is an open question whether to take [u8; N]
where N is the total number of bytes in the struct or whether something more generically useful such as &[u8]
or impl Iterator<Item = u8>
should be taken as argument in the from_bytes
constructor.
Also for the cases with invalid bit ranges mentioned above we need to return a Result
instead of Self
directly.
I currently strive for the following definition:
fn from_bytes(bytes: &[u8]) -> Result<Self, Error>;
Where Error
is either an OutOfBounds
or InvalidByteAmount
error kind.
Endianess
One could argue if endianess should be considered.
I don't think that we should do that here since there is a well set endianess already within the internal encoding of the bitfield struct that is little endian.
Core Read and Write
An improvement over operating directly on &[u8]
would be to operate generically on types implementing Read
and Write
. However, this API cannot be made available for no_std
environments currently.
Future Problems
Without #3 this API is a lot easier since it doesn't need to handle bit holes that are implied by implementing the mentioned feature.
from modular-bitfield.
With 48bd16c in place we should have an easier life implementing a sane API for converting from bits.
from modular-bitfield.
Simplified implementation that does not yet respect the eventually future addition of non-power-of-two enums: 5c55798
from modular-bitfield.
Related Issues (20)
- Support for `to_u32()` conversion to `u32` and similar
- #[bitfield] on empty struct causes compilation error
- Feature Request: Ability to specify default value for field
- Is this crate maintained? HOT 1
- Implement serde derives replacement HOT 2
- Feature request: Array support HOT 3
- Into<uN> and TryFrom<uN> for uN bitfields HOT 2
- `with_*` methods should have `#[must_use]` annotation HOT 2
- Help: CheckFillsUnalignedBits unsatisfied HOT 2
- Support rust union structs HOT 1
- Feature request: Allow naming fields "Bytes" HOT 1
- Question: Array of bitfields HOT 1
- #[repr(...)] for unfilled bitfields?
- Generic structs not supported HOT 7
- [Question] Polymorphic bitfileds HOT 1
- Support for byte arrays
- `#[non_exhaustive]` enum support HOT 9
- const fn support for getters (and setters if possible) HOT 1
- How to implement signed 10 bit number? HOT 8
- [Feature Request] Better Note for (Size % 8)
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from modular-bitfield.