Crc32c

A native implementation of CRC32c using Rust.

The Rust implementation will try to use the SSE4.2 instruction if available. It will fallback to a software implementation if that instruction is not available at compile time.

Installation

This package is built on top of rustler. See it's docs for more information about what is required to build packages that are using it.

def deps do
  [
    {:crc32c, "~> 1.0.0"}
  ]
end

Usage

<<1,2,3,4>>
|> Crc32c.calc()
|> IO.inspect()

Benchmarks

A comparison with the crc32cer package.

##### With input of 16 bytes #####
Name                  ips        average  deviation         median         99th %
crc32cer           5.07 M      197.31 ns  ±5063.12%           0 ns         990 ns
crc32c_rust        3.52 M      283.70 ns  ±3250.68%           0 ns         990 ns

Comparison:
crc32cer           5.07 M
crc32c_rust        3.52 M - 1.44x slower +86.39 ns

##### With input 1048576 bytes #####
Name                  ips        average  deviation         median         99th %
crc32c_rust        4.89 K      204.40 μs    ±16.20%      192.99 μs      323.99 μs
crc32cer           1.93 K      519.43 μs     ±6.66%      508.99 μs      666.99 μs

Comparison:
crc32c_rust        4.89 K
crc32cer           1.93 K - 2.54x slower +315.02 μs