Module layout 

Advanced layout and header surface.

Structs

AccountHeader

The 16-byte account header, overlay-safe.

AccountReader

Header-aware read-only account reader.

FieldInfo

Descriptor for one field in a Hopper layout.

FingerprintTransition

Pair of fingerprints for asserting version transitions.

HopperHeader

The canonical 16-byte header at the start of every Hopper account.

LayoutFingerprint

An 8-byte deterministic layout fingerprint.

LayoutInfo

Runtime metadata snapshot of an account’s layout identity.

Constants

HEADER_FORMAT

Header format version. Bump only if the header wire format itself changes.

HEADER_LEN

Header length in bytes.

Traits

AccountLayout

Hopper account layout identity, the top of the unified trait stack.

FieldMap

Trait for layouts that expose field metadata in wire order.

FixedLayout

Trait for types with a compile-time known wire size.

LayoutContract

A compile-time layout contract binding type identity to wire format.

Pod

Marker for types that can be safely overlaid on raw account bytes.

WireLayout

A ZeroCopy type with a compile-time-known wire size.

WireType

Marker trait for types safe to use as zero-copy wire fields.

ZeroCopy

Canonical marker for types that may be overlaid on raw bytes.

Functions

check_header

Validate the header against expected values.

init_header

Initialize an account’s header from a layout contract type.

read_discriminator

Read the discriminator byte from raw account data.

read_header_flags

Read the flags field as u16.

read_layout_id

Read the 8-byte layout_id.

read_version

Read the version byte.

write_header

Write a complete header to the beginning of data.