Struct GptHeader

#[repr(C, packed(1))]
pub struct GptHeader {

    pub signature: GptHeaderSignature,
    pub revision: GptHeaderRevision,
    pub header_size: U32Le,
    pub header_crc32: Crc32,
    pub reserved: U32Le,
    pub my_lba: LbaLe,
    pub alternate_lba: LbaLe,
    pub first_usable_lba: LbaLe,
    pub last_usable_lba: LbaLe,
    pub disk_guid: Guid,
    pub partition_entry_lba: LbaLe,
    pub number_of_partition_entries: U32Le,
    pub size_of_partition_entry: U32Le,
    pub partition_entry_array_crc32: Crc32,
}

GPT header that appears near the start and end of a GPT-formatted disk.

Fields

signature: GptHeaderSignature

Magic signature for the header. In a valid header this must be GptHeaderSignature::EFI_COMPATIBLE_PARTITION_TABLE_HEADER.

revision: GptHeaderRevision

Revision number for the header. In a valid header this must be GptHeaderRevision::VERSION_1_0.

header_size: U32Le

Size of the header in bytes. In a valid header this must be greater than or equal to 92 bytes, and less than or equal to the block size.

header_crc32: Crc32

CRC32 checksum of the entire header. When calculating the checksum, this field is included in the checksum as four zero bytes.

reserved: U32Le

Reserved bytes. In a valid header these must be all zero.

my_lba: LbaLe

The LBA that contains this header.

alternate_lba: LbaLe

The LBA that contains the alternate header.

first_usable_lba: LbaLe

First LBA that can be used for the data of a partition in the partition entry array.

last_usable_lba: LbaLe

Last LBA that can be used for the data of a partition in the partition entry array.

disk_guid: Guid

Unique ID for the disk.

partition_entry_lba: LbaLe

First LBA of the partition entry array.

number_of_partition_entries: U32Le

Number of partitions in the partition entry array.

size_of_partition_entry: U32Le

Size in bytes of each entry in the partition entry array.

partition_entry_array_crc32: Crc32

CRC32 checksum of the partition entry array.

Implementations

impl GptHeader

pub fn is_signature_valid(&self) -> bool

Check if the header’s signature matches GptHeaderSignature::EFI_COMPATIBLE_PARTITION_TABLE_HEADER.

pub fn calculate_header_crc32(&self) -> Crc32

Available on crate feature bytemuck only.

Calculate the header’s CRC32 checksum. This returns the checksum but does not update the checksum field in the header.

pub fn update_header_crc32(&mut self)

Available on crate feature bytemuck only.

Update the header’s CRC32 checksum.

pub fn get_partition_entry_array_layout( &self, ) -> Result<GptPartitionEntryArrayLayout, GptPartitionEntrySizeError>

Get the GptPartitionEntryArrayLayout for this header.

Trait Implementations

impl Clone for GptHeader

fn clone(&self) -> GptHeader

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for GptHeader

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

Formats the value using the given formatter.

impl Default for GptHeader

fn default() -> Self

Returns the “default value” for a type.

impl Display for GptHeader

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

Formats the value using the given formatter.

impl Hash for GptHeader

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for GptHeader

fn cmp(&self, other: &GptHeader) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for GptHeader

fn eq(&self, other: &GptHeader) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd for GptHeader

fn partial_cmp(&self, other: &GptHeader) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Zeroable for GptHeader

fn zeroed() -> Self

Calls zeroed.

impl Copy for GptHeader

impl Eq for GptHeader

impl Pod for GptHeader

impl StructuralPartialEq for GptHeader