Struct FileHeader 

#[repr(C)]
pub struct FileHeader {

    pub magic: [u8; 4],
    pub version: u16,
    pub flags: u16,
    pub file_id: u64,
    pub current_version: u64,
    pub root_hash: [u8; 32],
    pub current_hash: [u8; 32],
    pub created_at: u64,
    pub modified_at: u64,
    pub encrypted_rules_offset: u64,
    pub encrypted_rules_length: u64,
    pub version_chain_offset: u64,
    pub version_chain_count: u64,
    pub signatures_offset: u64,
    pub signatures_count: u64,
    pub audit_trail_offset: u64,
    pub audit_trail_count: u64,
    pub string_table_offset: u64,
    pub string_table_length: u64,
    pub reserved: [u8; 72],
}

File header structure (256 bytes, RFC-0002 Section 3.1)

This struct uses zerocopy for zero-copy parsing from byte slices. All integers are little-endian.

Examples

use aion_context::parser::FileHeader;
use zerocopy::FromBytes;

let data = vec![0u8; 256];
let header = FileHeader::read_from_prefix(&data)?;

Fields

magic: [u8; 4]

Magic number: “AION” (0x41494F4E)

version: u16

Format version (current = 2)

flags: u16

Feature flags

• Bit 0: Encrypted (1 = encrypted, 0 = plaintext)
• Bit 1-15: Reserved (must be 0)

file_id: u64

Unique file identifier

current_version: u64

Current version number (monotonically increasing)

root_hash: [u8; 32]

Root hash (BLAKE3, genesis version)

current_hash: [u8; 32]

Current hash (BLAKE3, latest version)

created_at: u64

Creation timestamp (nanoseconds since Unix epoch)

modified_at: u64

Last modification timestamp

encrypted_rules_offset: u64

Encrypted rules section offset

encrypted_rules_length: u64

Encrypted rules section length (bytes)

version_chain_offset: u64

Version chain section offset

version_chain_count: u64

Version chain count (number of entries)

signatures_offset: u64

Signatures section offset

signatures_count: u64

Signatures count

audit_trail_offset: u64

Audit trail section offset

audit_trail_count: u64

Audit trail count

string_table_offset: u64

String table offset

string_table_length: u64

String table length

reserved: [u8; 72]

Reserved bytes (must be zero)

Implementations

impl FileHeader

pub const fn is_valid_magic(&self) -> bool

Validate header magic number

Examples

use aion_context::parser::FileHeader;

let mut header = FileHeader::default();
assert!(header.is_valid_magic());

header.magic = *b"XXXX";
assert!(!header.is_valid_magic());

header.magic = *b"AION";
assert!(header.is_valid_magic());

pub const fn is_encrypted(&self) -> bool

Check if file is encrypted

Examples

use aion_context::parser::FileHeader;

let mut header = FileHeader::default();
assert!(!header.is_encrypted());

header.flags = 0x0001; // Set encrypted bit
assert!(header.is_encrypted());

pub const fn file_id(&self) -> FileId

Get file ID as FileId type

Examples

use aion_context::parser::FileHeader;
use aion_context::types::FileId;

let mut header = FileHeader::default();
header.file_id = 42;
assert_eq!(header.file_id(), FileId(42));

pub const fn current_version(&self) -> VersionNumber

Get current version as VersionNumber type

pub fn validate(&self) -> Result<()>

Validate header structure

Checks:

• Magic number is correct
• Version is supported
• Reserved bytes are zero

Errors

Returns error if validation fails

Trait Implementations

impl AsBytes for FileHeader

where [u8; 4]: AsBytes, u16: AsBytes, u64: AsBytes, [u8; 32]: AsBytes, [u8; 72]: AsBytes, HasPadding<FileHeader, { _ }>: ShouldBe<false>,

fn as_bytes(&self) -> &[u8]

Gets the bytes of this value.

fn as_bytes_mut(&mut self) -> &mut [u8]

where Self: FromBytes,

Gets the bytes of this value mutably.

fn write_to(&self, bytes: &mut [u8]) -> Option<()>

Writes a copy of self to bytes.

fn write_to_prefix(&self, bytes: &mut [u8]) -> Option<()>

Writes a copy of self to the prefix of bytes.

fn write_to_suffix(&self, bytes: &mut [u8]) -> Option<()>

Writes a copy of self to the suffix of bytes.

impl Clone for FileHeader

fn clone(&self) -> FileHeader

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for FileHeader

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

Formats the value using the given formatter.

impl Default for FileHeader

fn default() -> Self

Returns the “default value” for a type.

impl FromBytes for FileHeader

where [u8; 4]: FromBytes, u16: FromBytes, u64: FromBytes, [u8; 32]: FromBytes, [u8; 72]: FromBytes,

fn ref_from(bytes: &[u8]) -> Option<&Self>

where Self: Sized,

Interprets the given bytes as a &Self without copying.

fn ref_from_prefix(bytes: &[u8]) -> Option<&Self>

where Self: Sized,

Interprets the prefix of the given bytes as a &Self without copying.

fn ref_from_suffix(bytes: &[u8]) -> Option<&Self>

where Self: Sized,

Interprets the suffix of the given bytes as a &Self without copying.

fn mut_from(bytes: &mut [u8]) -> Option<&mut Self>

where Self: Sized + AsBytes,

Interprets the given bytes as a &mut Self without copying.

fn mut_from_prefix(bytes: &mut [u8]) -> Option<&mut Self>

where Self: Sized + AsBytes,

Interprets the prefix of the given bytes as a &mut Self without copying.

fn mut_from_suffix(bytes: &mut [u8]) -> Option<&mut Self>

where Self: Sized + AsBytes,

Interprets the suffix of the given bytes as a &mut Self without copying.

fn slice_from(bytes: &[u8]) -> Option<&[Self]>

where Self: Sized,

Interprets the given bytes as a &[Self] without copying.

fn slice_from_prefix(bytes: &[u8], count: usize) -> Option<(&[Self], &[u8])>

where Self: Sized,

Interprets the prefix of the given bytes as a &[Self] with length equal to count without copying.

fn slice_from_suffix(bytes: &[u8], count: usize) -> Option<(&[u8], &[Self])>

where Self: Sized,

Interprets the suffix of the given bytes as a &[Self] with length equal to count without copying.

fn mut_slice_from(bytes: &mut [u8]) -> Option<&mut [Self]>

where Self: Sized + AsBytes,

Interprets the given bytes as a &mut [Self] without copying.

fn mut_slice_from_prefix( bytes: &mut [u8], count: usize, ) -> Option<(&mut [Self], &mut [u8])>

where Self: Sized + AsBytes,

Interprets the prefix of the given bytes as a &mut [Self] with length equal to count without copying.

fn mut_slice_from_suffix( bytes: &mut [u8], count: usize, ) -> Option<(&mut [u8], &mut [Self])>

where Self: Sized + AsBytes,

Interprets the suffix of the given bytes as a &mut [Self] with length equal to count without copying.

fn read_from(bytes: &[u8]) -> Option<Self>

where Self: Sized,

Reads a copy of Self from bytes.

fn read_from_prefix(bytes: &[u8]) -> Option<Self>

where Self: Sized,

Reads a copy of Self from the prefix of bytes.

fn read_from_suffix(bytes: &[u8]) -> Option<Self>

where Self: Sized,

Reads a copy of Self from the suffix of bytes.

impl FromZeroes for FileHeader

where [u8; 4]: FromZeroes, u16: FromZeroes, u64: FromZeroes, [u8; 32]: FromZeroes, [u8; 72]: FromZeroes,

fn zero(&mut self)

Overwrites self with zeroes.

fn new_zeroed() -> Self

where Self: Sized,

Creates an instance of Self from zeroed bytes.

impl Copy for FileHeader