Struct CowMap 

pub struct CowMap { /* private fields */ }

Adaptive cluster map for cluster_id -> location resolution.

Each cluster is either local (written to this file), inherited from the parent (ParentRef), or unallocated.

Implementations

impl CowMap

pub fn new_flat(cluster_count: u32) -> Self

Create a new flat-array map with cluster_count entries, all Unallocated.

pub fn new_parent_ref(cluster_count: u32) -> Self

Create a new flat-array map with all entries set to ParentRef.

pub fn lookup(&self, cluster_id: u32) -> CowMapEntry

Look up a cluster by ID.

pub fn update(&mut self, cluster_id: u32, entry: CowMapEntry)

Update a cluster entry.

pub fn serialize(&self) -> Vec<u8>

Serialize the map to bytes.

Wire format (flat_array): format(u8) | cluster_count(u32) | entries[cluster_count] Each entry: tag(u8) | offset(u64) tag 0x00 = Unallocated, tag 0x01 = ParentRef, tag 0x02 = LocalOffset

pub fn deserialize(data: &[u8], format: MapFormat) -> Result<Self, RvfError>

Deserialize a CowMap from bytes.

pub fn local_cluster_count(&self) -> u32

Count of clusters that have local data.

pub fn cluster_count(&self) -> u32

Total number of clusters in the map.

pub fn format(&self) -> MapFormat

Get the map format.