Struct HeaderCodec

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pub struct HeaderCodec;

Expand description

Deterministic encoder/decoder for the fixed-size header region.

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impl HeaderCodec

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pub fn write<W: Write + Seek>(writer: W, header: &Header) -> Result<()>

Writes the header back to the beginning of the file, zero-filling any unused bytes.

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pub fn read<R: Read + Write + Seek>(reader: R) -> Result<Header>

Reads and decodes the header from the start of the file. If legacy lock metadata is present in the reserved padding, it is cleared in-place before decoding to maintain forward compatibility with older files.

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pub fn encode(header: &Header) -> Result<[u8; 4096]>

Encodes a header into the canonical 4 KB byte representation.

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pub fn decode(bytes: &[u8; 4096]) -> Result<Header>

Decodes the canonical header bytes into a strongly typed struct after validation.

Auto Trait Implementations§

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impl UnwindSafe for HeaderCodec

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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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where T: ?Sized,

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fn into_any(self: Box<T>) -> Box<dyn Any>

Converts Box<dyn Trait> (where Trait: Downcast) to Box<dyn Any>, which can then be downcast into Box<dyn ConcreteType> where ConcreteType implements Trait.

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Converts Rc<Trait> (where Trait: Downcast) to Rc<Any>, which can then be further downcast into Rc<ConcreteType> where ConcreteType implements Trait.

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Converts &mut Trait (where Trait: Downcast) to &Any. This is needed since Rust cannot generate &mut Any’s vtable from &mut Trait’s.

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fn into_any_send(self: Box<T>) -> Box<dyn Any + Send>

Converts Box<Trait> (where Trait: DowncastSend) to Box<dyn Any + Send>, which can then be downcast into Box<ConcreteType> where ConcreteType implements Trait.

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where T: Any + Send + Sync,

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fn into_any_sync(self: Box<T>) -> Box<dyn Any + Send + Sync>

Converts Box<Trait> (where Trait: DowncastSync) to Box<dyn Any + Send + Sync>, which can then be downcast into Box<ConcreteType> where ConcreteType implements Trait.

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

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Calls U::from(self).

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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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