зеркало из https://github.com/mozilla/gecko-dev.git
f23e8c7f0e
Output from "./mach vendor rust": % ./mach vendor rust 0:01.15 rm -rf /Users/ato/src/gecko/third_party/rust Adding adler32 v1.0.2 Adding build_const v0.2.0 Adding bzip2 v0.3.2 Adding bzip2-sys v0.1.6 Adding cc v1.0.4 Adding crc v1.7.0 Adding flate2 v1.0.1 Adding miniz_oxide v0.1.2 Adding miniz_oxide_c_api v0.1.2 MozReview-Commit-ID: EBVi4OdzYm3 --HG-- extra : rebase_source : b2f756574ebabc96b1378713a7ee6247274a388e |
||
|---|---|---|
| .. | ||
| benches | ||
| src | ||
| tests | ||
| .cargo-checksum.json | ||
| .travis.yml | ||
| Cargo.toml | ||
| LICENSE-APACHE | ||
| LICENSE-MIT | ||
| README.md | ||
| build.rs | ||
README.md
crc 
Rust implementation of CRC(32, 64) with support of various standards
Usage
Add crc to Cargo.toml
[dependencies]
crc = "^1.0.0"
or
[dependencies.crc]
git = "https://github.com/mrhooray/crc-rs"
Add this to crate root
extern crate crc;
Compute CRC32
use crc::{crc32, Hasher32};
// CRC-32-IEEE being the most commonly used one
assert_eq!(crc32::checksum_ieee(b"123456789"), 0xcbf43926);
assert_eq!(crc32::checksum_castagnoli(b"123456789"), 0xe3069283);
assert_eq!(crc32::checksum_koopman(b"123456789"), 0x2d3dd0ae);
// use provided or custom polynomial
let mut digest = crc32::Digest::new(crc32::IEEE);
digest.write(b"123456789");
assert_eq!(digest.sum32(), 0xcbf43926);
// with initial
let mut digest = crc32::Digest::new_with_initial(crc32::IEEE, 0u32);
digest.write(b"123456789");
assert_eq!(digest.sum32(), 0xcbf43926);
Compute CRC64
use crc::{crc64, Hasher64};
assert_eq!(crc64::checksum_ecma(b"123456789"), 0x995dc9bbdf1939fa);
assert_eq!(crc64::checksum_iso(b"123456789"), 0xb90956c775a41001);
// use provided or custom polynomial
let mut digest = crc64::Digest::new(crc64::ECMA);
digest.write(b"123456789");
assert_eq!(digest.sum64(), 0x995dc9bbdf1939fa);
// with initial
let mut digest = crc64::Digest::new_with_initial(crc64::ECMA, 0u64);
digest.write(b"123456789");
assert_eq!(digest.sum64(), 0x995dc9bbdf1939fa);
Benchmark
Bencher is currently not available in Rust stable releases.
cargo bench with 2.3 GHz Intel Core i7 results ~430MB/s throughput. Comparison
cargo bench
Running target/release/bench-5c82e94dab3e9c79
running 4 tests
test bench_crc32_make_table ... bench: 439 ns/iter (+/- 82)
test bench_crc32_update_megabytes ... bench: 2327803 ns/iter (+/- 138845)
test bench_crc64_make_table ... bench: 1200 ns/iter (+/- 223)
test bench_crc64_update_megabytes ... bench: 2322472 ns/iter (+/- 92870)
test result: ok. 0 passed; 0 failed; 0 ignored; 4 measured
License
Licensed under either of
- Apache License, Version 2.0 (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
- MIT License (LICENSE-MIT or http://opensource.org/licenses/MIT)
at your option.
Contribution
Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.