crc

Rust implementation of CRC(32, 64) with support of various standards

• Crate
• Documentation
• Usage
• Benchmark
• License

Usage

Add crc to Cargo.toml toml [dependencies] crc = "^1.0.0" or toml [dependencies.crc] git = "https://github.com/mrhooray/crc-rs"

Add this to crate root rust extern crate crc;

Compute CRC32

```rust use crc::{crc32, Hasher32};

// CRC-32-IEEE being the most commonly used one asserteq!(crc32::checksumieee(b"123456789"), 0xcbf43926); asserteq!(crc32::checksumcastagnoli(b"123456789"), 0xe3069283); asserteq!(crc32::checksumkoopman(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::newwithinitial(crc32::IEEE, 0u32); digest.write(b"123456789"); assert_eq!(digest.sum32(), 0xcbf43926); ```

Compute CRC64

```rust use crc::{crc64, Hasher64};

asserteq!(crc64::checksumecma(b"123456789"), 0x995dc9bbdf1939fa); asserteq!(crc64::checksumiso(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::newwithinitial(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 benchcrc32maketable ... bench: 439 ns/iter (+/- 82) test benchcrc32updatemegabytes ... bench: 2327803 ns/iter (+/- 138845) test benchcrc64maketable ... bench: 1200 ns/iter (+/- 223) test benchcrc64updatemegabytes ... bench: 2322472 ns/iter (+/- 92870)

test result: ok. 0 passed; 0 failed; 0 ignored; 4 measured ```

License

MIT