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Adding support for crc8, crc16 and crc32 bit-reflected simd, x86 targets
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,72 @@ | ||
| use crate::crc32::update_simd; | ||
| use crate::simd::{SimdValue, SimdValueOps}; | ||
| use crate::table::{crc16_table_slice_16, crc32_simd_coefficients}; | ||
| use crate::{Algorithm, Crc, Digest, Simd}; | ||
|
|
||
| use super::{finalize, init, update_slice16}; | ||
|
|
||
| impl Crc<Simd<u16>> { | ||
| pub const fn new(algorithm: &'static Algorithm<u16>) -> Self { | ||
| Self { | ||
| algorithm, | ||
| table: ( | ||
| crc16_table_slice_16(algorithm.width, algorithm.poly, algorithm.refin), | ||
| unsafe { | ||
| // SAFETY: SimdValue is the same as u64x2 and this only changes the representation of 8*u64 to 4*u64x2. | ||
| core::mem::transmute(crc32_simd_coefficients( | ||
| algorithm.width, | ||
| algorithm.poly as u32, | ||
| )) | ||
| }, | ||
| ), | ||
| } | ||
| } | ||
|
|
||
| pub fn checksum(&self, bytes: &[u8]) -> u16 { | ||
| let mut crc = init(self.algorithm, self.algorithm.init); | ||
| crc = self.update(crc, bytes); | ||
| finalize(self.algorithm, crc) | ||
| } | ||
|
|
||
| fn update(&self, mut crc: u16, bytes: &[u8]) -> u16 { | ||
| if !SimdValue::is_supported() || !self.algorithm.refin { | ||
| return update_slice16(crc, self.algorithm.refin, &self.table.0, bytes); | ||
| } | ||
|
|
||
| let (bytes_before, chunks, bytes_after) = unsafe { bytes.align_to::<[SimdValue; 4]>() }; | ||
| crc = update_slice16(crc, self.algorithm.refin, &self.table.0, bytes_before); | ||
| if let Some(first_chunk) = chunks.first() { | ||
| // SAFETY: All required features are supported, by checking SimdValue::is_supported. | ||
| crc = unsafe { update_simd(crc as u32, &self.table.1, first_chunk, chunks) } as u16; | ||
| } | ||
| update_slice16(crc, self.algorithm.refin, &self.table.0, bytes_after) | ||
| } | ||
|
|
||
| pub fn digest(&self) -> Digest<Simd<u16>> { | ||
| self.digest_with_initial(self.algorithm.init) | ||
| } | ||
|
|
||
| /// Construct a `Digest` with a given initial value. | ||
| /// | ||
| /// This overrides the initial value specified by the algorithm. | ||
| /// The effects of the algorithm's properties `refin` and `width` | ||
| /// are applied to the custom initial value. | ||
| pub fn digest_with_initial(&self, initial: u16) -> Digest<Simd<u16>> { | ||
| let value = init(self.algorithm, initial); | ||
| Digest::new(self, value) | ||
| } | ||
| } | ||
|
|
||
| impl<'a> Digest<'a, Simd<u16>> { | ||
| const fn new(crc: &'a Crc<Simd<u16>>, value: u16) -> Self { | ||
| Digest { crc, value } | ||
| } | ||
|
|
||
| pub fn update(&mut self, bytes: &[u8]) { | ||
| self.value = self.crc.update(self.value, bytes); | ||
| } | ||
|
|
||
| pub const fn finalize(self) -> u16 { | ||
| finalize(self.crc.algorithm, self.value) | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,69 @@ | ||
| use crate::simd::{SimdValue, SimdValueOps}; | ||
| use crate::table::{crc32_simd_coefficients, crc32_table_slice_16}; | ||
| use crate::{Algorithm, Crc, Digest, Simd}; | ||
|
|
||
| use super::{finalize, init, update_simd, update_slice16}; | ||
|
|
||
| impl Crc<Simd<u32>> { | ||
| pub const fn new(algorithm: &'static Algorithm<u32>) -> Self { | ||
| Self { | ||
| algorithm, | ||
| table: ( | ||
| crc32_table_slice_16(algorithm.width, algorithm.poly, algorithm.refin), | ||
| unsafe { | ||
| // SAFETY: Both represent numbers | ||
| core::mem::transmute(crc32_simd_coefficients(algorithm.width, algorithm.poly)) | ||
| }, | ||
| ), | ||
| } | ||
| } | ||
|
|
||
| pub fn checksum(&self, bytes: &[u8]) -> u32 { | ||
| let mut crc = init(self.algorithm, self.algorithm.init); | ||
| crc = self.update(crc, bytes); | ||
| finalize(self.algorithm, crc) | ||
| } | ||
|
|
||
| fn update(&self, mut crc: u32, bytes: &[u8]) -> u32 { | ||
| if !SimdValue::is_supported() || !self.algorithm.refin { | ||
| return update_slice16(crc, self.algorithm.refin, &self.table.0, bytes); | ||
| } | ||
|
|
||
| // SAFETY: Both represent numbers | ||
| let (bytes_before, chunks, bytes_after) = unsafe { bytes.align_to::<[SimdValue; 4]>() }; | ||
| crc = update_slice16(crc, self.algorithm.refin, &self.table.0, bytes_before); | ||
| if let Some(first_chunk) = chunks.first() { | ||
| // SAFETY: All required features are supported, by checking SimdValue::is_supported. | ||
| crc = unsafe { update_simd(crc, &self.table.1, first_chunk, &chunks[1..]) }; | ||
| } | ||
| update_slice16(crc, self.algorithm.refin, &self.table.0, bytes_after) | ||
| } | ||
|
|
||
| pub fn digest(&self) -> Digest<Simd<u32>> { | ||
| self.digest_with_initial(self.algorithm.init) | ||
| } | ||
|
|
||
| /// Construct a `Digest` with a given initial value. | ||
| /// | ||
| /// This overrides the initial value specified by the algorithm. | ||
| /// The effects of the algorithm's properties `refin` and `width` | ||
| /// are applied to the custom initial value. | ||
| pub fn digest_with_initial(&self, initial: u32) -> Digest<Simd<u32>> { | ||
| let value = init(self.algorithm, initial); | ||
| Digest::new(self, value) | ||
| } | ||
| } | ||
|
|
||
| impl<'a> Digest<'a, Simd<u32>> { | ||
| const fn new(crc: &'a Crc<Simd<u32>>, value: u32) -> Self { | ||
| Digest { crc, value } | ||
| } | ||
|
|
||
| pub fn update(&mut self, bytes: &[u8]) { | ||
| self.value = self.crc.update(self.value, bytes); | ||
| } | ||
|
|
||
| pub const fn finalize(self) -> u32 { | ||
| finalize(self.crc.algorithm, self.value) | ||
| } | ||
| } |
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