Struct BlockIdentity 

pub struct BlockIdentity {
    pub table_id: u64,
    pub block_type: BlockType,
    pub dict_id: u32,
    pub window_log: u8,
}

Identifies a block for encryption AAD and audit purposes.

Carried through the Block I/O API instead of separate block_type / aad: &[u8] arguments — see the module docstring for the rationale.

Fields

table_id: u64

Identifier of the owning store unit — for SST blocks this is the per-tree [crate::TableId] (a u64 alias); for blob files it is the crate::vlog::BlobFileId (also a u64 alias). Bound into the AAD so a block cannot be substituted for one from a different table. The owning tree id is deliberately NOT part of the identity (it is process-ephemeral, not durable across reopen); cross-tree substitution is prevented by per-tree key isolation instead. See the module docstring.

block_type: BlockType

Whether this is a Data, Filter, Index, or Meta block. Was previously a separate block_type: BlockType argument on the Block API; now lives here so the call site only computes one context value.

dict_id: u32

Zstd dictionary id used for this block, or 0 if no dictionary applies. Binds the block to a specific dictionary version so that decompressing with a different dictionary (whether by mistake or by attack) surfaces as an AEAD authentication failure rather than as silently wrong plaintext.

window_log: u8

Zstd window_log advertised in the frame header, or 0 if no zstd compression applies. Binds the block to a specific decompression-memory budget; attempts to substitute a block with a different window_log (a known “window bomb” vector) fail AEAD authentication.

Trait Implementations

impl Clone for BlockIdentity

fn clone(&self) -> BlockIdentity

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for BlockIdentity

impl Debug for BlockIdentity

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

Formats the value using the given formatter.