Struct SegmentHeader

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pub struct SegmentHeader {
    pub epoch: u64,
    pub record_count: u32,
}

Expand description

Segment file header.

Layout (24 bytes):

[0..4]   magic: u32 (0x5057414C = "PWAL")
[4..6]   version: u16
[6..8]   reserved: u16 (for alignment)
[8..16]  epoch: u64
[16..20] record_count: u32
[20..24] checksum: u32 (CRC32C of header fields 0..20)

Fields§

§epoch: u64

Epoch number for this segment.

§record_count: u32

Number of records in this segment.

Implementations§

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impl SegmentHeader

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pub const fn new(epoch: u64, record_count: u32) -> Self

Create a new segment header.

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pub fn to_bytes(&self) -> [u8; 24]

Serialize the header to bytes.

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pub fn from_bytes(buf: &[u8; 24]) -> Result<Self, String>

Parse a header from bytes.

Trait Implementations§

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impl Clone for SegmentHeader

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fn clone(&self) -> SegmentHeader

Returns a duplicate of the value. Read more

1.0.0 (const: unstable) · Source§

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more

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impl Copy for SegmentHeader

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impl Debug for SegmentHeader

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more

Auto Trait Implementations§

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impl UnwindSafe for SegmentHeader

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more

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impl<T> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)

Performs copy-assignment from self to dest. Read more

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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> Instrument for T

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fn instrument(self, _span: NoopSpan) -> Self

Instruments this future with a span (no-op when disabled).

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fn in_current_span(self) -> Self

Instruments this future with the current span (no-op when disabled).

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impl<T> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more

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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more

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impl<T, U> Into for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> IntoEither for T

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fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more

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fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more

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