Page Map

class jam.pvm.page_map.Page(address: jam.types.base.integers.fixed.U32, length: jam.types.base.integers.fixed.U32, is_writable: jam.types.base.boolean.Boolean)

Bases: Codable, JsonSerde

address: U32

length: U32

is_writable: Boolean

__init__(address: U32, length: U32, is_writable: Boolean) → None

Initialize the Codable.

Parameters:

• codec – Optional codec to use for encoding/decoding

• enc_sequence – Optional function that returns sequence of fields to encode

static decode_from(buffer: bytes | bytearray | memoryview, offset: int = 0) → Tuple[T, int]

Decode from buffer. Must be implemented by subclasses or added via decorator.

Parameters:

• buffer – Buffer to decode from

• offset – Starting position in buffer

Returns:

• The decoded value

• Number of bytes read

Return type:

Tuple containing

encode_into(buffer: bytearray, offset: int = 0) → int

Encode into provided buffer.

encode_size() → int

Calculate number of bytes needed to encode.

class jam.pvm.page_map.PageMap(initial: Sequence[T] = [], codec: Codec[T] | None = None)

Bases: Vector

static decode_from(buffer: bytes | bytearray | memoryview, offset: int = 0) → Tuple[Vector[T], int]

Decode from buffer. Must be implemented by subclasses or added via decorator.

Parameters:

• buffer – Buffer to decode from

• offset – Starting position in buffer

Returns:

• The decoded value

• Number of bytes read

Return type:

Tuple containing