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MetadataSectionHeader

edgevec::persistence::header

Struct MetadataSectionHeader 

Source 
#[repr(C)]
pub struct MetadataSectionHeader {
    pub magic: [u8; 4],
    pub version: u16,
    pub format: u8,
    pub reserved: u8,
    pub size: u32,
    pub crc: u32,
}
Expand description

Metadata section header (16 bytes).

Placed after tombstone bitvec when Flags::HAS_METADATA flag is set.

§Layout

Total size: 16 bytes Alignment: 4 bytes

OffsetSizeFieldDescription
04magic“META” = [0x4D, 0x45, 0x54, 0x41]
42versionSection format version (1)
61formatSerialization format (1=Postcard)
71reservedReserved for future use (0)
84sizeSize of serialized metadata
124crcCRC32 of serialized metadata

§Thread Safety

This type is Send + Sync as it is a POD struct.

Fields§

§magic: [u8; 4]

Magic number: “META” = [0x4D, 0x45, 0x54, 0x41]

§version: u16

Section format version (currently 1)

§format: u8

Serialization format: 1=Postcard, 2=JSON

§reserved: u8

Reserved for future use (must be 0)

§size: u32

Size of serialized metadata in bytes

§crc: u32

CRC32 of serialized metadata bytes

Implementations§

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impl MetadataSectionHeader

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pub const MAGIC: [u8; 4] = METADATA_MAGIC

The expected magic bytes “META”.

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pub const VERSION: u16 = METADATA_VERSION

The current section version.

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pub const FORMAT_POSTCARD: u8 = FORMAT_POSTCARD

Postcard serialization format identifier.

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pub const FORMAT_JSON: u8 = FORMAT_JSON

JSON serialization format identifier.

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pub fn new_postcard(size: u32, crc: u32) -> Self

Creates a new MetadataSectionHeader for Postcard-serialized metadata.

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pub fn new_json(size: u32, crc: u32) -> Self

Creates a new MetadataSectionHeader for JSON-serialized metadata.

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pub fn as_bytes(&self) -> &[u8; 16]

Returns the byte representation of the header.

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pub fn from_bytes(bytes: &[u8]) -> Result<Self, MetadataHeaderError>

Parses a MetadataSectionHeader from bytes.

§Requirements
  • bytes must be at least 16 bytes
§Errors

Returns Err if:

  • Buffer is less than 16 bytes
  • Magic number is invalid
  • Version is unsupported
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pub fn validate_magic(&self) -> Result<(), MetadataHeaderError>

Validates the magic bytes.

§Errors

Returns MetadataHeaderError::InvalidMagic if magic bytes don’t match “META”.

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pub fn validate_version(&self) -> Result<(), MetadataHeaderError>

Validates the version is supported.

§Errors

Returns MetadataHeaderError::UnsupportedVersion if version is newer than current.

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pub fn validate_format(&self) -> Result<(), MetadataHeaderError>

Validates the serialization format is supported.

§Errors

Returns MetadataHeaderError::UnsupportedFormat if format is not 1 (Postcard) or 2 (JSON).

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pub fn is_postcard(&self) -> bool

Returns true if this header uses Postcard serialization.

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pub fn is_json(&self) -> bool

Returns true if this header uses JSON serialization.

Trait Implementations§

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impl Clone for MetadataSectionHeader

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fn clone(&self) -> MetadataSectionHeader

Returns a duplicate of the value. Read more
1.0.0 · Source§

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

Performs copy-assignment from source. Read more
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impl Debug for MetadataSectionHeader

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

Formats the value using the given formatter. Read more
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impl Zeroable for MetadataSectionHeader

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fn zeroed() -> Self

Calls zeroed. Read more
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impl Copy for MetadataSectionHeader

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impl Pod for MetadataSectionHeader

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