halo2_base::safe_types

Struct VarLenBytes

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pub struct VarLenBytes<F: ScalarField, const MAX_LEN: usize> { /* private fields */ }
Expand description

Represents a variable length byte array in circuit.

Each element is guaranteed to be a byte, given by type SafeByte. To represent a variable length array, we must know the maximum possible length MAX_LEN the array could be – this is some additional context the user must provide. Then we right pad the array with 0s to the maximum length (we do not constrain that these paddings must be 0s).

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impl<F: ScalarField, const MAX_LEN: usize> VarLenBytes<F, MAX_LEN>

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pub fn bytes(&self) -> &[SafeByte<F>; MAX_LEN]

The byte array, right padded

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pub fn len(&self) -> &AssignedValue<F>

Witness representing the actual length of the byte array. Upon construction, this is range checked to be at most MAX_LEN

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impl<F: ScalarField, const MAX_LEN: usize> VarLenBytes<F, MAX_LEN>

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pub fn new(bytes: [SafeByte<F>; MAX_LEN], len: AssignedValue<F>) -> Self

Slightly unsafe constructor: it is not constrained that len <= MAX_LEN.

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pub fn max_len(&self) -> usize

Returns the maximum length of the byte array.

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pub fn left_pad_to_fixed( &self, ctx: &mut Context<F>, gate: &impl GateInstructions<F>, ) -> FixLenBytes<F, MAX_LEN>

Left pads the variable length byte array with 0s to the MAX_LEN. Takes a fixed length array self.bytes and returns a length MAX_LEN array equal to [[0; MAX_LEN - len], self.bytes[..len]].concat(), i.e., we take self.bytes[..len] and zero pad it on the left, where len = self.len

Assumes 0 < self.len <= MAX_LEN.

§Panics

If self.len is not in the range (0, MAX_LEN].

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pub fn ensure_0_padding( &self, ctx: &mut Context<F>, gate: &impl GateInstructions<F>, ) -> Self

Return a copy of the byte array with 0 padding ensured.

Trait Implementations§

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impl<F: Clone + ScalarField, const MAX_LEN: usize> Clone for VarLenBytes<F, MAX_LEN>

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fn clone(&self) -> VarLenBytes<F, MAX_LEN>

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl<F: Debug + ScalarField, const MAX_LEN: usize> Debug for VarLenBytes<F, MAX_LEN>

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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<F, const MAX_LEN: usize> Freeze for VarLenBytes<F, MAX_LEN>
where F: Freeze,

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impl<F, const MAX_LEN: usize> RefUnwindSafe for VarLenBytes<F, MAX_LEN>
where F: RefUnwindSafe,

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impl<F, const MAX_LEN: usize> Send for VarLenBytes<F, MAX_LEN>

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impl<F, const MAX_LEN: usize> Sync for VarLenBytes<F, MAX_LEN>

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impl<F, const MAX_LEN: usize> Unpin for VarLenBytes<F, MAX_LEN>
where F: Unpin,

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impl<F, const MAX_LEN: usize> UnwindSafe for VarLenBytes<F, MAX_LEN>
where F: UnwindSafe,

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

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