Struct Code0Header 

pub struct Code0Header {
    pub above_a5: u32,
    pub below_a5: u32,
    pub jump_table_size: u32,
    pub jump_table_offset: u32,
}

CODE 0 resource header — 16 bytes parsed from the start of every 68k application’s CODE resource ID 0. Defines the A5-world layout (above + below sizes) and where the jump table lives within it. Inside Macintosh: Memory 1992, 7-31 (“CODE Resource Format”).

Fields

above_a5: u32

Bytes of A5-world space above A5 (application globals, not counting the jump table itself).

below_a5: u32

Bytes of A5-world space below A5 (parameter area + initial SP).

jump_table_size: u32

Total size in bytes of the jump table region (8 bytes per entry).

jump_table_offset: u32

Byte offset from A5 to the jump table base (typically 32).

Implementations

impl Code0Header

pub fn parse(data: &[u8]) -> Option<Self>

Parse a 16-byte CODE 0 header from data (4 big-endian u32 fields). Returns None if data is shorter than 16 bytes; otherwise infallible.

pub fn num_entries(&self) -> usize

Number of jump-table entries (each entry is 8 bytes).

Trait Implementations

impl Clone for Code0Header

fn clone(&self) -> Code0Header

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Code0Header

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

Formats the value using the given formatter.

impl Default for Code0Header

fn default() -> Code0Header

Returns the “default value” for a type.