Struct crc32fast::Hasher

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pub struct Hasher {
    pub(crate) amount: u64,
    pub(crate) state: State,
}
Expand description

Represents an in-progress CRC32 computation.

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§amount: u64§state: State

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impl Hasher

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pub fn new() -> Self

Create a new Hasher.

This will perform a CPU feature detection at runtime to select the most optimal implementation for the current processor architecture.

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pub fn new_with_initial(init: u32) -> Self

Create a new Hasher with an initial CRC32 state.

This works just like Hasher::new, except that it allows for an initial CRC32 state to be passed in.

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pub fn new_with_initial_len(init: u32, amount: u64) -> Self

Create a new Hasher with an initial CRC32 state.

As new_with_initial, but also accepts a length (in bytes). The resulting object can then be used with combine to compute crc(a || b) from crc(a), crc(b), and len(b).

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

Process the given byte slice and update the hash state.

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pub fn finalize(self) -> u32

Finalize the hash state and return the computed CRC32 value.

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pub fn reset(&mut self)

Reset the hash state.

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

Combine the hash state with the hash state for the subsequent block of bytes.

Trait Implementations§

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impl Clone for Hasher

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fn clone(&self) -> Hasher

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

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

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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 Default for Hasher

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fn default() -> Self

Returns the “default value” for a type. Read more
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impl Hasher for Hasher

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fn write(&mut self, bytes: &[u8])

Writes some data into this Hasher. Read more
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fn finish(&self) -> u64

Returns the hash value for the values written so far. Read more
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fn write_u8(&mut self, i: u8)

Writes a single u8 into this hasher.
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fn write_u16(&mut self, i: u16)

Writes a single u16 into this hasher.
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fn write_u32(&mut self, i: u32)

Writes a single u32 into this hasher.
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fn write_u64(&mut self, i: u64)

Writes a single u64 into this hasher.
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fn write_u128(&mut self, i: u128)

Writes a single u128 into this hasher.
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fn write_usize(&mut self, i: usize)

Writes a single usize into this hasher.
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fn write_i8(&mut self, i: i8)

Writes a single i8 into this hasher.
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fn write_i16(&mut self, i: i16)

Writes a single i16 into this hasher.
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fn write_i32(&mut self, i: i32)

Writes a single i32 into this hasher.
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fn write_i64(&mut self, i: i64)

Writes a single i64 into this hasher.
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fn write_i128(&mut self, i: i128)

Writes a single i128 into this hasher.
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fn write_isize(&mut self, i: isize)

Writes a single isize into this hasher.
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fn write_length_prefix(&mut self, len: usize)

🔬This is a nightly-only experimental API. (hasher_prefixfree_extras)
Writes a length prefix into this hasher, as part of being prefix-free. Read more
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fn write_str(&mut self, s: &str)

🔬This is a nightly-only experimental API. (hasher_prefixfree_extras)
Writes a single str into this hasher. Read more

Auto Trait Implementations§

Blanket Implementations§

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impl<T> Any for Twhere T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for Twhere T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for Twhere T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for Twhere U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> ToOwned for Twhere T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for Twhere U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.