Struct CompressionInfo 

pub struct CompressionInfo {
    pub config_version: u16,
    pub lamports_per_write: u32,
    pub last_claimed_slot: u64,
    pub rent_config: RentConfig,
    pub state: CompressionState,
}

Fields

config_version: u16

Version of the compressible config used to initialize this account.

lamports_per_write: u32

Lamports to top up on each write (from config, stored per-account to avoid passing config on every write)

last_claimed_slot: u64

Slot when rent was last claimed (epoch boundary accounting).

rent_config: RentConfig

Rent function parameters for determining compressibility/claims.

state: CompressionState

Account compression state.

Implementations

impl CompressionInfo

pub fn new_from_config(cfg: &CompressibleConfig, current_slot: u64) -> Self

Create a new CompressionInfo initialized from a compressible config.

Rent sponsor is always the config’s rent_sponsor (not stored per-account). This means rent always flows to the protocol’s rent pool upon compression, regardless of who paid for account creation.

pub fn new_decompressed() -> Result<Self, ProgramError>

Backward-compat constructor used by older call sites; initializes minimal fields. Rent will flow to config’s rent_sponsor upon compression.

pub fn bump_last_claimed_slot(&mut self) -> Result<(), ProgramError>

Update last_claimed_slot to the current slot.

pub fn set_last_claimed_slot(&mut self, slot: u64)

Explicitly set last_claimed_slot.

pub fn last_claimed_slot(&self) -> u64

Get last_claimed_slot.

pub fn set_compressed(&mut self)

pub fn is_compressed(&self) -> bool

impl CompressionInfo

pub fn calculate_top_up_lamports( &self, num_bytes: u64, current_slot: u64, current_lamports: u64, rent_exemption_lamports: u64, ) -> u64

Calculate top-up lamports required for a write.

Logic (same as CTokens):

• If account is compressible (can’t pay current + next epoch): return lamports_per_write + deficit
• If account has >= max_funded_epochs: return 0 (no top-up needed)
• Otherwise: return lamports_per_write (maintenance mode)

pub fn top_up_rent<'a>( &self, account_info: &AccountInfo<'a>, payer_info: &AccountInfo<'a>, system_program_info: &AccountInfo<'a>, ) -> Result<(), ProgramError>

Top up rent on write if needed and transfer lamports from payer to account. This is the standard pattern for all write operations on compressible PDAs.

Arguments

• account_info - The PDA account to top up
• payer_info - The payer account (will be debited)
• system_program_info - The System Program account for CPI

Returns

• Ok(()) if top-up succeeded or was not needed
• Err(ProgramError) if transfer failed

Trait Implementations

impl BorshDeserialize for CompressionInfo

where u16: BorshDeserialize, u32: BorshDeserialize, u64: BorshDeserialize, RentConfig: BorshDeserialize, CompressionState: BorshDeserialize,

fn deserialize_reader<R: Read>(reader: &mut R) -> Result<Self, Error>

fn deserialize(buf: &mut &[u8]) -> Result<Self, Error>

Deserializes this instance from a given slice of bytes. Updates the buffer to point at the remaining bytes.

fn try_from_slice(v: &[u8]) -> Result<Self, Error>

Deserialize this instance from a slice of bytes.

fn try_from_reader<R>(reader: &mut R) -> Result<Self, Error>

where R: Read,

impl BorshSerialize for CompressionInfo

where u16: BorshSerialize, u32: BorshSerialize, u64: BorshSerialize, RentConfig: BorshSerialize, CompressionState: BorshSerialize,

fn serialize<W: Write>(&self, writer: &mut W) -> Result<(), Error>

fn try_to_vec(&self) -> Result<Vec<u8>, Error>

Serialize this instance into a vector of bytes.

impl Clone for CompressionInfo

fn clone(&self) -> CompressionInfo

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for CompressionInfo

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

Formats the value using the given formatter.

impl Default for CompressionInfo

fn default() -> CompressionInfo

Returns the “default value” for a type.

impl Space for CompressionInfo

const INIT_SPACE: usize = 23usize