Struct Crc32 

pub struct Crc32 { /* private fields */ }

A CRC-32 computed over data that arrives in pieces.

The result does not depend on how the data was split.

Examples

use compress_lib::checksum::{Crc32, crc32};

let mut crc = Crc32::new();
crc.update(b"1234");
crc.update(b"56789");
assert_eq!(crc.finish(), crc32(b"123456789"));

Implementations

impl Crc32

pub const fn new() -> Self

A CRC-32 over no data yet.

Examples

assert_eq!(compress_lib::checksum::Crc32::new().finish(), 0);

pub const fn from_value(crc: u32, len: u64) -> Self

Continues from a CRC-32 value already computed over len bytes (for example, a stored checksum that more data is appended to).

Examples

use compress_lib::checksum::{Crc32, crc32};

let mut crc = Crc32::from_value(crc32(b"1234"), 4);
crc.update(b"56789");
assert_eq!(crc.finish(), crc32(b"123456789"));

pub fn update(&mut self, data: &[u8])

Feeds more data.

Examples

let mut crc = compress_lib::checksum::Crc32::new();
crc.update(b"abc");
assert_eq!(crc.finish(), 0x3524_41C2);

pub const fn finish(&self) -> u32

The CRC-32 of everything fed so far. Does not reset; more data may follow.

Examples

let mut crc = compress_lib::checksum::Crc32::new();
crc.update(b"a");
assert_eq!(crc.finish(), 0xE8B7_BE43);

pub const fn len(&self) -> u64

The number of bytes fed so far (wrapping at 2^64).

Examples

let mut crc = compress_lib::checksum::Crc32::new();
crc.update(b"abc");
assert_eq!(crc.len(), 3);

pub const fn is_empty(&self) -> bool

true when no data has been fed.

Examples

assert!(compress_lib::checksum::Crc32::new().is_empty());

pub fn combine(&mut self, other: &Crc32)

Appends the checksum of a second piece of data computed separately, as if its bytes had been fed here.

Examples

use compress_lib::checksum::{Crc32, crc32};

let mut left = Crc32::new();
left.update(b"hello ");
let mut right = Crc32::new();
right.update(b"world");
left.combine(&right);
assert_eq!(left.finish(), crc32(b"hello world"));

Trait Implementations

impl Clone for Crc32

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Crc32

impl Debug for Crc32

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

Formats the value using the given formatter.

impl Default for Crc32

fn default() -> Self

Returns the “default value” for a type.

impl Eq for Crc32

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 PartialEq for Crc32

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Crc32