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SizeProof

dig_store::size

Struct SizeProof 

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pub struct SizeProof;
Expand description

The client-side SIZE PROOF check (SPEC §4).

A .dig’s real size is trusted ONLY when it matches the size the store anchored on chain. The anchored bucket is obtained via an on-chain read (NC-9, dig-merkle); the real byte length is measured from the downloaded artifact.

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impl SizeProof

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pub fn verify(anchored: SizeBucket, actual_bytes: u64) -> SizeVerdict

Decides whether a downloaded .dig of actual_bytes bytes may be kept, given the anchored bucket the store recorded on chain.

The .dig is ACCEPTED iff its real byte length falls into the SAME bucket the store anchored (SizeBucket::for_byte_len(actual_bytes) == anchored). Any other size — larger OR smaller — yields SizeVerdict::Discard: a wrong-size artifact is never what the store committed to, so it must not be cached or served.

A byte length above the 1 GiB ceiling has no bucket and therefore can never match; it is discarded rather than erroring, since a caller checking untrusted downloaded bytes wants a verdict, not a failure.

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pub fn require(anchored: SizeBucket, actual_bytes: u64) -> DigStoreResult<()>

Like verify but returns an error carrying the mismatch detail instead of a verdict — convenient when a caller wants ?-propagation on the discard path.

§Errors

Returns DigStoreError::SizeProofMismatch when the .dig would be discarded.

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