vendor/crc-fast/src/crc32/fusion/aarch64/mod.rs at paths-for-resolutions-and-amend · andymccall/oxygen

◆ paths-for-resolutions-and-amend oxygen / vendor / crc-fast / src / crc32 / fusion / aarch64 / mod.rs

10.8 KiB · Rust · last changed Strata: the cloud stores send through ureq, so every release target links 1 month ago source blame history raw

//! Provides CRC-32/ISCSI and CRC-32/ISO-HDLC calculations using a fusion of native CLMUL
//! instructions and native CRC calculation instructions on aarch64.
//!
//! https://dougallj.wordpress.com/2022/05/22/faster-crc32-on-the-apple-m1/
//!
//! Converted to Rust from the original C code generated by https://github.com/corsix/fast-crc32/
//! with the help of Claude.ai.
//!
//! Modified as necessary for this Rust implementation.
//!
//! MIT licensed.

#![cfg(target_arch = "aarch64")]

mod iscsi;
mod iso_hdlc;

use core::arch::aarch64::*;
#[cfg(feature = "std")]
use std::arch::is_aarch64_feature_detected;

use iscsi::crc_pmull::crc32_iscsi_v12e_v1;
use iscsi::crc_pmull_sha3::crc32_iscsi_eor3_v9s3x2e_s3;
use iso_hdlc::crc_pmull::crc32_iso_hdlc_v12e_v1;
use iso_hdlc::crc_pmull_sha3::crc32_iso_hdlc_eor3_v9s3x2e_s3;

#[inline(always)]
pub fn crc32_iscsi(crc: u32, data: &[u8]) -> u32 {
    let data_len = data.len();

    // there's some variance among different aarch64 CPUs (Apple Silicon, AWS Graviton, etc.), but
    // 127 bytes is the "small" threshold where this is generally faster
    if data_len < 128 {
        return unsafe { crc32_iscsi_small_fast(crc, data) };
    }

    #[cfg(feature = "std")]
    let has_sha3 = is_aarch64_feature_detected!("sha3");
    #[cfg(not(feature = "std"))]
    let has_sha3 = cfg!(target_feature = "sha3");

    if has_sha3 {
        unsafe { crc32_iscsi_aes_sha3(crc, data, data_len) }
    } else {
        unsafe { crc32_iscsi_aes(crc, data, data_len) }
    }
}

#[inline(always)]
pub fn crc32_iso_hdlc(crc: u32, data: &[u8]) -> u32 {
    let data_len = data.len();

    // there's some variance among different aarch64 CPUs (Apple Silicon, AWS Graviton, etc.), but
    // 127 bytes is the "small" threshold where this is generally faster
    if data_len < 128 {
        return unsafe { crc32_iso_hdlc_small_fast(crc, data) };
    }

    #[cfg(feature = "std")]
    let has_sha3 = is_aarch64_feature_detected!("sha3");
    #[cfg(not(feature = "std"))]
    let has_sha3 = cfg!(target_feature = "sha3");

    if has_sha3 {
        unsafe { crc32_iso_hdlc_aes_sha3(crc, data, data_len) }
    } else {
        unsafe { crc32_iso_hdlc_aes(crc, data, data_len) }
    }
}

#[inline]
#[target_feature(enable = "crc,aes,sha3")]
unsafe fn crc32_iscsi_aes_sha3(crc: u32, data: &[u8], data_len: usize) -> u32 {
    unsafe {
        const LARGE_BUFFER_THRESHOLD: usize = 1024;

        // Select implementation based on buffer size
        if data_len <= LARGE_BUFFER_THRESHOLD {
            crc32_iscsi_v12e_v1(crc, data.as_ptr(), data_len)
        } else {
            crc32_iscsi_eor3_v9s3x2e_s3(crc, data.as_ptr(), data_len)
        }
    }
}

#[inline]
#[target_feature(enable = "crc,aes")]
unsafe fn crc32_iscsi_aes(crc: u32, data: &[u8], data_len: usize) -> u32 {
    unsafe { crc32_iscsi_v12e_v1(crc, data.as_ptr(), data_len) }
}

#[inline]
#[target_feature(enable = "crc,aes,sha3")]
unsafe fn crc32_iso_hdlc_aes_sha3(crc: u32, data: &[u8], data_len: usize) -> u32 {
    unsafe {
        const LARGE_BUFFER_THRESHOLD: usize = 1024;

        // Select implementation based on buffer size
        if data_len <= LARGE_BUFFER_THRESHOLD {
            crc32_iso_hdlc_v12e_v1(crc, data.as_ptr(), data_len)
        } else {
            crc32_iso_hdlc_eor3_v9s3x2e_s3(crc, data.as_ptr(), data_len)
        }
    }
}

#[inline]
#[target_feature(enable = "crc,aes")]
unsafe fn crc32_iso_hdlc_aes(crc: u32, data: &[u8], data_len: usize) -> u32 {
    unsafe { crc32_iso_hdlc_v12e_v1(crc, data.as_ptr(), data_len) }
}

#[inline]
#[target_feature(enable = "aes")]
unsafe fn clmul_lo(a: uint64x2_t, b: uint64x2_t) -> uint64x2_t {
    // Polynomial multiply low parts - convert u128 result to uint64x2_t
    let result = vmull_p64(vgetq_lane_u64(a, 0), vgetq_lane_u64(b, 0));
    vreinterpretq_u64_p128(result)
}

#[inline]
#[target_feature(enable = "aes")]
unsafe fn clmul_hi(a: uint64x2_t, b: uint64x2_t) -> uint64x2_t {
    // Polynomial multiply high parts - convert u128 result to uint64x2_t
    let result = vmull_p64(vgetq_lane_u64(a, 1), vgetq_lane_u64(b, 1));
    vreinterpretq_u64_p128(result)
}

#[inline]
#[target_feature(enable = "aes")]
unsafe fn clmul_scalar(a: u32, b: u32) -> uint64x2_t {
    // Polynomial multiply scalars - convert u128 result to uint64x2_t
    let result = vmull_p64(a as u64, b as u64);
    vreinterpretq_u64_p128(result)
}

#[inline]
#[target_feature(enable = "aes")]
unsafe fn clmul_lo_and_xor(a: uint64x2_t, b: uint64x2_t, c: uint64x2_t) -> uint64x2_t {
    veorq_u64(clmul_lo(a, b), c)
}

#[inline]
#[target_feature(enable = "aes")]
unsafe fn clmul_hi_and_xor(a: uint64x2_t, b: uint64x2_t, c: uint64x2_t) -> uint64x2_t {
    veorq_u64(clmul_hi(a, b), c)
}

/// CRC-32/ISCSI calculation for small buffers (< 128 bytes) using unrolled native CRC instructions
#[inline]
#[target_feature(enable = "crc")]
pub unsafe fn crc32_iscsi_small_fast(mut crc: u32, data: &[u8]) -> u32 {
    let (prefix, aligned, suffix) = data.align_to::<u64>();

    // Process unaligned prefix bytes
    for &byte in prefix {
        crc = __crc32cb(crc, byte);
    }

    // Process aligned u64s with 8-way unrolling (64 bytes per iteration)
    let mut chunks = aligned.chunks_exact(8);
    for chunk in &mut chunks {
        crc = __crc32cd(crc, chunk[0]);
        crc = __crc32cd(crc, chunk[1]);
        crc = __crc32cd(crc, chunk[2]);
        crc = __crc32cd(crc, chunk[3]);
        crc = __crc32cd(crc, chunk[4]);
        crc = __crc32cd(crc, chunk[5]);
        crc = __crc32cd(crc, chunk[6]);
        crc = __crc32cd(crc, chunk[7]);
    }

    // Process remaining aligned u64s
    for &val in chunks.remainder() {
        crc = __crc32cd(crc, val);
    }

    // Process unaligned suffix bytes
    for &byte in suffix {
        crc = __crc32cb(crc, byte);
    }

    crc
}

/// CRC-32/ISO-HDLC calculation for small buffers (< 128 bytes) using unrolled native CRC instructions
#[inline]
#[target_feature(enable = "crc")]
pub unsafe fn crc32_iso_hdlc_small_fast(mut crc: u32, data: &[u8]) -> u32 {
    let (prefix, aligned, suffix) = data.align_to::<u64>();

    // Process unaligned prefix bytes
    for &byte in prefix {
        crc = __crc32b(crc, byte);
    }

    // Process aligned u64s with 8-way unrolling (64 bytes per iteration)
    let mut chunks = aligned.chunks_exact(8);
    for chunk in &mut chunks {
        crc = __crc32d(crc, chunk[0]);
        crc = __crc32d(crc, chunk[1]);
        crc = __crc32d(crc, chunk[2]);
        crc = __crc32d(crc, chunk[3]);
        crc = __crc32d(crc, chunk[4]);
        crc = __crc32d(crc, chunk[5]);
        crc = __crc32d(crc, chunk[6]);
        crc = __crc32d(crc, chunk[7]);
    }

    // Process remaining aligned u64s
    for &val in chunks.remainder() {
        crc = __crc32d(crc, val);
    }

    // Process unaligned suffix bytes
    for &byte in suffix {
        crc = __crc32b(crc, byte);
    }

    crc
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::test::consts::TEST_CHECK_STRING;
    use crc::{Crc, Table};
    use rand::{rng, Rng};

    const RUST_CRC32_ISO_HDLC: Crc<u32, Table<16>> =
        Crc::<u32, Table<16>>::new(&crc::CRC_32_ISO_HDLC);

    const RUST_CRC32_ISCSI: Crc<u32, Table<16>> = Crc::<u32, Table<16>>::new(&crc::CRC_32_ISCSI);

    #[test]
    fn test_crc32_iso_hdlc_check() {
        assert_eq!(
            crc32_iso_hdlc(0xffffffff, TEST_CHECK_STRING) ^ 0xffffffff,
            0xcbf43926
        );
    }

    #[test]
    fn test_crc32_iso_hdlc_small_all_lengths() {
        for len in 1..=255 {
            crc32_iso_hdlc_random(len)
        }
    }

    #[test]
    fn test_crc32_iso_hdlc_medium_lengths() {
        // Test each length from 256 to 1024, which should fold and include handling remainders
        for len in 256..=1024 {
            crc32_iso_hdlc_random(len)
        }
    }

    #[test]
    fn test_crc32_iso_hdlc_large_lengths() {
        // Test 1 MiB just before, at, and just after the folding boundaries
        for len in 1048575..1048577 {
            crc32_iso_hdlc_random(len)
        }
    }

    #[test]
    fn test_crc32_iscsi_check() {
        assert_eq!(
            crc32_iscsi(0xffffffff, TEST_CHECK_STRING) ^ 0xffffffff,
            0xe3069283
        );
    }

    #[test]
    fn test_crc32_iscsi_small_all_lengths() {
        for len in 1..=255 {
            crc32_iscsi_random(len);
        }
    }

    #[test]
    fn test_crc32_iscsi_medium_lengths() {
        // Test each length from 256 to 1024, which should fold and include handling remainders
        for len in 256..=1024 {
            crc32_iscsi_random(len);
        }
    }

    #[test]
    fn test_crc32_iscsi_large_lengths() {
        // Test 1 MiB just before, at, and just after the folding boundaries
        for len in 1048575..1048577 {
            crc32_iscsi_random(len);
        }
    }

    #[cfg(target_feature = "sha3")]
    fn crc32_iso_hdlc_random(len: usize) {
        let mut data = vec![0u8; len];
        rng().fill(&mut data[..]);

        let checksum = RUST_CRC32_ISO_HDLC.checksum(&data);

        assert_eq!(crc32_iso_hdlc(0xffffffff, &data) ^ 0xffffffff, checksum);

        unsafe {
            assert_eq!(
                crc32_iso_hdlc_eor3_v9s3x2e_s3(0xffffffff, data.as_ptr(), data.len()) ^ 0xffffffff,
                checksum
            );

            assert_eq!(
                crc32_iso_hdlc_v12e_v1(0xffffffff, data.as_ptr(), data.len()) ^ 0xffffffff,
                checksum
            );
        }
    }

    #[cfg(not(target_feature = "sha3"))]
    fn crc32_iso_hdlc_random(len: usize) {
        let mut data = vec![0u8; len];
        rng().fill(&mut data[..]);

        let checksum = RUST_CRC32_ISO_HDLC.checksum(&data);

        assert_eq!(crc32_iso_hdlc(0xffffffff, &data) ^ 0xffffffff, checksum);

        unsafe {
            assert_eq!(
                crc32_iso_hdlc_v12e_v1(0xffffffff, data.as_ptr(), data.len()) ^ 0xffffffff,
                checksum
            );
        }
    }

    #[cfg(target_feature = "sha3")]
    fn crc32_iscsi_random(len: usize) {
        let mut data = vec![0u8; len];
        rng().fill(&mut data[..]);

        let checksum = RUST_CRC32_ISCSI.checksum(&data);

        assert_eq!(crc32_iscsi(0xffffffff, &data) ^ 0xffffffff, checksum);

        unsafe {
            assert_eq!(
                crc32_iscsi_eor3_v9s3x2e_s3(0xffffffff, data.as_ptr(), data.len()) ^ 0xffffffff,
                checksum
            );

            assert_eq!(
                crc32_iscsi_v12e_v1(0xffffffff, data.as_ptr(), data.len()) ^ 0xffffffff,
                checksum
            );
        }
    }

    #[cfg(not(target_feature = "sha3"))]
    fn crc32_iscsi_random(len: usize) {
        let mut data = vec![0u8; len];
        rng().fill(&mut data[..]);

        let checksum = RUST_CRC32_ISCSI.checksum(&data);

        assert_eq!(crc32_iscsi(0xffffffff, &data) ^ 0xffffffff, checksum);

        unsafe {
            assert_eq!(
                crc32_iscsi_v12e_v1(0xffffffff, data.as_ptr(), data.len()) ^ 0xffffffff,
                checksum
            );
        }
    }
}

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1	//! Provides CRC-32/ISCSI and CRC-32/ISO-HDLC calculations using a fusion of native CLMUL
2	//! instructions and native CRC calculation instructions on aarch64.
3	//!
4	//! https://dougallj.wordpress.com/2022/05/22/faster-crc32-on-the-apple-m1/
5	//!
6	//! Converted to Rust from the original C code generated by https://github.com/corsix/fast-crc32/
7	//! with the help of Claude.ai.
8	//!
9	//! Modified as necessary for this Rust implementation.
10	//!
11	//! MIT licensed.
12
13	#![cfg(target_arch = "aarch64")]
14
15	mod iscsi;
16	mod iso_hdlc;
17
18	use core::arch::aarch64::*;
19	#[cfg(feature = "std")]
20	use std::arch::is_aarch64_feature_detected;
21
22	use iscsi::crc_pmull::crc32_iscsi_v12e_v1;
23	use iscsi::crc_pmull_sha3::crc32_iscsi_eor3_v9s3x2e_s3;
24	use iso_hdlc::crc_pmull::crc32_iso_hdlc_v12e_v1;
25	use iso_hdlc::crc_pmull_sha3::crc32_iso_hdlc_eor3_v9s3x2e_s3;
26
27	#[inline(always)]
28	pub fn crc32_iscsi(crc: u32, data: &[u8]) -> u32 {
29	let data_len = data.len();
30
31	// there's some variance among different aarch64 CPUs (Apple Silicon, AWS Graviton, etc.), but
32	// 127 bytes is the "small" threshold where this is generally faster
33	if data_len < 128 {
34	return unsafe { crc32_iscsi_small_fast(crc, data) };
35	}
36
37	#[cfg(feature = "std")]
38	let has_sha3 = is_aarch64_feature_detected!("sha3");
39	#[cfg(not(feature = "std"))]
40	let has_sha3 = cfg!(target_feature = "sha3");
41
42	if has_sha3 {
43	unsafe { crc32_iscsi_aes_sha3(crc, data, data_len) }
44	} else {
45	unsafe { crc32_iscsi_aes(crc, data, data_len) }
46	}
47	}
48
49	#[inline(always)]
50	pub fn crc32_iso_hdlc(crc: u32, data: &[u8]) -> u32 {
51	let data_len = data.len();
52
53	// there's some variance among different aarch64 CPUs (Apple Silicon, AWS Graviton, etc.), but
54	// 127 bytes is the "small" threshold where this is generally faster
55	if data_len < 128 {
56	return unsafe { crc32_iso_hdlc_small_fast(crc, data) };
57	}
58
59	#[cfg(feature = "std")]
60	let has_sha3 = is_aarch64_feature_detected!("sha3");
61	#[cfg(not(feature = "std"))]
62	let has_sha3 = cfg!(target_feature = "sha3");
63
64	if has_sha3 {
65	unsafe { crc32_iso_hdlc_aes_sha3(crc, data, data_len) }
66	} else {
67	unsafe { crc32_iso_hdlc_aes(crc, data, data_len) }
68	}
69	}
70
71	#[inline]
72	#[target_feature(enable = "crc,aes,sha3")]
73	unsafe fn crc32_iscsi_aes_sha3(crc: u32, data: &[u8], data_len: usize) -> u32 {
74	unsafe {
75	const LARGE_BUFFER_THRESHOLD: usize = 1024;
76
77	// Select implementation based on buffer size
78	if data_len <= LARGE_BUFFER_THRESHOLD {
79	crc32_iscsi_v12e_v1(crc, data.as_ptr(), data_len)
80	} else {
81	crc32_iscsi_eor3_v9s3x2e_s3(crc, data.as_ptr(), data_len)
82	}
83	}
84	}
85
86	#[inline]
87	#[target_feature(enable = "crc,aes")]
88	unsafe fn crc32_iscsi_aes(crc: u32, data: &[u8], data_len: usize) -> u32 {
89	unsafe { crc32_iscsi_v12e_v1(crc, data.as_ptr(), data_len) }
90	}
91
92	#[inline]
93	#[target_feature(enable = "crc,aes,sha3")]
94	unsafe fn crc32_iso_hdlc_aes_sha3(crc: u32, data: &[u8], data_len: usize) -> u32 {
95	unsafe {
96	const LARGE_BUFFER_THRESHOLD: usize = 1024;
97
98	// Select implementation based on buffer size
99	if data_len <= LARGE_BUFFER_THRESHOLD {
100	crc32_iso_hdlc_v12e_v1(crc, data.as_ptr(), data_len)
101	} else {
102	crc32_iso_hdlc_eor3_v9s3x2e_s3(crc, data.as_ptr(), data_len)
103	}
104	}
105	}
106
107	#[inline]
108	#[target_feature(enable = "crc,aes")]
109	unsafe fn crc32_iso_hdlc_aes(crc: u32, data: &[u8], data_len: usize) -> u32 {
110	unsafe { crc32_iso_hdlc_v12e_v1(crc, data.as_ptr(), data_len) }
111	}
112
113	#[inline]
114	#[target_feature(enable = "aes")]
115	unsafe fn clmul_lo(a: uint64x2_t, b: uint64x2_t) -> uint64x2_t {
116	// Polynomial multiply low parts - convert u128 result to uint64x2_t
117	let result = vmull_p64(vgetq_lane_u64(a, 0), vgetq_lane_u64(b, 0));
118	vreinterpretq_u64_p128(result)
119	}
120
121	#[inline]
122	#[target_feature(enable = "aes")]
123	unsafe fn clmul_hi(a: uint64x2_t, b: uint64x2_t) -> uint64x2_t {
124	// Polynomial multiply high parts - convert u128 result to uint64x2_t
125	let result = vmull_p64(vgetq_lane_u64(a, 1), vgetq_lane_u64(b, 1));
126	vreinterpretq_u64_p128(result)
127	}
128
129	#[inline]
130	#[target_feature(enable = "aes")]
131	unsafe fn clmul_scalar(a: u32, b: u32) -> uint64x2_t {
132	// Polynomial multiply scalars - convert u128 result to uint64x2_t
133	let result = vmull_p64(a as u64, b as u64);
134	vreinterpretq_u64_p128(result)
135	}
136
137	#[inline]
138	#[target_feature(enable = "aes")]
139	unsafe fn clmul_lo_and_xor(a: uint64x2_t, b: uint64x2_t, c: uint64x2_t) -> uint64x2_t {
140	veorq_u64(clmul_lo(a, b), c)
141	}
142
143	#[inline]
144	#[target_feature(enable = "aes")]
145	unsafe fn clmul_hi_and_xor(a: uint64x2_t, b: uint64x2_t, c: uint64x2_t) -> uint64x2_t {
146	veorq_u64(clmul_hi(a, b), c)
147	}
148
149	/// CRC-32/ISCSI calculation for small buffers (< 128 bytes) using unrolled native CRC instructions
150	#[inline]
151	#[target_feature(enable = "crc")]
152	pub unsafe fn crc32_iscsi_small_fast(mut crc: u32, data: &[u8]) -> u32 {
153	let (prefix, aligned, suffix) = data.align_to::<u64>();
154
155	// Process unaligned prefix bytes
156	for &byte in prefix {
157	crc = __crc32cb(crc, byte);
158	}
159
160	// Process aligned u64s with 8-way unrolling (64 bytes per iteration)
161	let mut chunks = aligned.chunks_exact(8);
162	for chunk in &mut chunks {
163	crc = __crc32cd(crc, chunk[0]);
164	crc = __crc32cd(crc, chunk[1]);
165	crc = __crc32cd(crc, chunk[2]);
166	crc = __crc32cd(crc, chunk[3]);
167	crc = __crc32cd(crc, chunk[4]);
168	crc = __crc32cd(crc, chunk[5]);
169	crc = __crc32cd(crc, chunk[6]);
170	crc = __crc32cd(crc, chunk[7]);
171	}
172
173	// Process remaining aligned u64s
174	for &val in chunks.remainder() {
175	crc = __crc32cd(crc, val);
176	}
177
178	// Process unaligned suffix bytes
179	for &byte in suffix {
180	crc = __crc32cb(crc, byte);
181	}
182
183	crc
184	}
185
186	/// CRC-32/ISO-HDLC calculation for small buffers (< 128 bytes) using unrolled native CRC instructions
187	#[inline]
188	#[target_feature(enable = "crc")]
189	pub unsafe fn crc32_iso_hdlc_small_fast(mut crc: u32, data: &[u8]) -> u32 {
190	let (prefix, aligned, suffix) = data.align_to::<u64>();
191
192	// Process unaligned prefix bytes
193	for &byte in prefix {
194	crc = __crc32b(crc, byte);
195	}
196
197	// Process aligned u64s with 8-way unrolling (64 bytes per iteration)
198	let mut chunks = aligned.chunks_exact(8);
199	for chunk in &mut chunks {
200	crc = __crc32d(crc, chunk[0]);
201	crc = __crc32d(crc, chunk[1]);
202	crc = __crc32d(crc, chunk[2]);
203	crc = __crc32d(crc, chunk[3]);
204	crc = __crc32d(crc, chunk[4]);
205	crc = __crc32d(crc, chunk[5]);
206	crc = __crc32d(crc, chunk[6]);
207	crc = __crc32d(crc, chunk[7]);
208	}
209
210	// Process remaining aligned u64s
211	for &val in chunks.remainder() {
212	crc = __crc32d(crc, val);
213	}
214
215	// Process unaligned suffix bytes
216	for &byte in suffix {
217	crc = __crc32b(crc, byte);
218	}
219
220	crc
221	}
222
223	#[cfg(test)]
224	mod tests {
225	use super::*;
226	use crate::test::consts::TEST_CHECK_STRING;
227	use crc::{Crc, Table};
228	use rand::{rng, Rng};
229
230	const RUST_CRC32_ISO_HDLC: Crc<u32, Table<16>> =
231	Crc::<u32, Table<16>>::new(&crc::CRC_32_ISO_HDLC);
232
233	const RUST_CRC32_ISCSI: Crc<u32, Table<16>> = Crc::<u32, Table<16>>::new(&crc::CRC_32_ISCSI);
234
235	#[test]
236	fn test_crc32_iso_hdlc_check() {
237	assert_eq!(
238	crc32_iso_hdlc(0xffffffff, TEST_CHECK_STRING) ^ 0xffffffff,
239	0xcbf43926
240	);
241	}
242
243	#[test]
244	fn test_crc32_iso_hdlc_small_all_lengths() {
245	for len in 1..=255 {
246	crc32_iso_hdlc_random(len)
247	}
248	}
249
250	#[test]
251	fn test_crc32_iso_hdlc_medium_lengths() {
252	// Test each length from 256 to 1024, which should fold and include handling remainders
253	for len in 256..=1024 {
254	crc32_iso_hdlc_random(len)
255	}
256	}
257
258	#[test]
259	fn test_crc32_iso_hdlc_large_lengths() {
260	// Test 1 MiB just before, at, and just after the folding boundaries
261	for len in 1048575..1048577 {
262	crc32_iso_hdlc_random(len)
263	}
264	}
265
266	#[test]
267	fn test_crc32_iscsi_check() {
268	assert_eq!(
269	crc32_iscsi(0xffffffff, TEST_CHECK_STRING) ^ 0xffffffff,
270	0xe3069283
271	);
272	}
273
274	#[test]
275	fn test_crc32_iscsi_small_all_lengths() {
276	for len in 1..=255 {
277	crc32_iscsi_random(len);
278	}
279	}
280
281	#[test]
282	fn test_crc32_iscsi_medium_lengths() {
283	// Test each length from 256 to 1024, which should fold and include handling remainders
284	for len in 256..=1024 {
285	crc32_iscsi_random(len);
286	}
287	}
288
289	#[test]
290	fn test_crc32_iscsi_large_lengths() {
291	// Test 1 MiB just before, at, and just after the folding boundaries
292	for len in 1048575..1048577 {
293	crc32_iscsi_random(len);
294	}
295	}
296
297	#[cfg(target_feature = "sha3")]
298	fn crc32_iso_hdlc_random(len: usize) {
299	let mut data = vec![0u8; len];
300	rng().fill(&mut data[..]);
301
302	let checksum = RUST_CRC32_ISO_HDLC.checksum(&data);
303
304	assert_eq!(crc32_iso_hdlc(0xffffffff, &data) ^ 0xffffffff, checksum);
305
306	unsafe {
307	assert_eq!(
308	crc32_iso_hdlc_eor3_v9s3x2e_s3(0xffffffff, data.as_ptr(), data.len()) ^ 0xffffffff,
309	checksum
310	);
311
312	assert_eq!(
313	crc32_iso_hdlc_v12e_v1(0xffffffff, data.as_ptr(), data.len()) ^ 0xffffffff,
314	checksum
315	);
316	}
317	}
318
319	#[cfg(not(target_feature = "sha3"))]
320	fn crc32_iso_hdlc_random(len: usize) {
321	let mut data = vec![0u8; len];
322	rng().fill(&mut data[..]);
323
324	let checksum = RUST_CRC32_ISO_HDLC.checksum(&data);
325
326	assert_eq!(crc32_iso_hdlc(0xffffffff, &data) ^ 0xffffffff, checksum);
327
328	unsafe {
329	assert_eq!(
330	crc32_iso_hdlc_v12e_v1(0xffffffff, data.as_ptr(), data.len()) ^ 0xffffffff,
331	checksum
332	);
333	}
334	}
335
336	#[cfg(target_feature = "sha3")]
337	fn crc32_iscsi_random(len: usize) {
338	let mut data = vec![0u8; len];
339	rng().fill(&mut data[..]);
340
341	let checksum = RUST_CRC32_ISCSI.checksum(&data);
342
343	assert_eq!(crc32_iscsi(0xffffffff, &data) ^ 0xffffffff, checksum);
344
345	unsafe {
346	assert_eq!(
347	crc32_iscsi_eor3_v9s3x2e_s3(0xffffffff, data.as_ptr(), data.len()) ^ 0xffffffff,
348	checksum
349	);
350
351	assert_eq!(
352	crc32_iscsi_v12e_v1(0xffffffff, data.as_ptr(), data.len()) ^ 0xffffffff,
353	checksum
354	);
355	}
356	}
357
358	#[cfg(not(target_feature = "sha3"))]
359	fn crc32_iscsi_random(len: usize) {
360	let mut data = vec![0u8; len];
361	rng().fill(&mut data[..]);
362
363	let checksum = RUST_CRC32_ISCSI.checksum(&data);
364
365	assert_eq!(crc32_iscsi(0xffffffff, &data) ^ 0xffffffff, checksum);
366
367	unsafe {
368	assert_eq!(
369	crc32_iscsi_v12e_v1(0xffffffff, data.as_ptr(), data.len()) ^ 0xffffffff,
370	checksum
371	);
372	}
373	}
374	}

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