Struct Crc32

#[repr(transparent)]
pub struct Crc32(pub U32Le);

32-bit CRC (cyclic redundancy check).

Tuple Fields

0: U32Le

Implementations

impl Crc32

pub const ALGORITHM: Algorithm<u32> = crc::CRC_32_ISO_HDLC

CRC32 algorithm used for GPT: crc::CRC_32_ISO_HDLC

Notes

The UEFI Specification is somewhat vague about the CRC algorithm used. Section 4.2 EFI Table Header says: “Unless otherwise specified, UEFI uses a standard CCITT32 CRC algorithm with a seed polynomial value of 0x04c11db7 for its CRC calculations.” There are no further mentions of either “CCITT32” or “04c11db7” in the spec. It’s not clear what if any specification CCITT32 refers to.

The Catalogue of parametrised CRC algorithms, which is the source of truth for the catalog used by the crc crate, has no references to CCITT32, but does have several entries that use the 0x04c11db7 polynomial. Of these, CRC-32/ISO-HDLC appears to be widely used and recommended by ITU-T, which is the successor of CCITT.

Trait Implementations

impl Clone for Crc32

fn clone(&self) -> Crc32

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Crc32

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

Formats the value using the given formatter.

impl Default for Crc32

fn default() -> Crc32

Returns the “default value” for a type.

impl Display for Crc32

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

Formats the value using the given formatter.

impl Hash for Crc32

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 LowerHex for Crc32

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

Formats the value using the given formatter.

impl Ord for Crc32

fn cmp(&self, other: &Crc32) -> 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 Crc32

fn eq(&self, other: &Crc32) -> 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 Crc32

fn partial_cmp(&self, other: &Crc32) -> 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 Crc32

fn zeroed() -> Self

Calls zeroed.

impl Copy for Crc32

impl Eq for Crc32

impl Pod for Crc32

impl StructuralPartialEq for Crc32