Question 1

crc-rs vs crc32fast – which should I use?

Accepted Answer

crc-rs offers more flexibility with multiple implementations and custom algorithms, while crc32fast is optimized specifically for CRC-32C. Choose crc-rs if you need support for various CRC standards or custom configurations; for pure CRC-32C speed, crc32fast might be faster in some cases.

Question 2

How to reduce binary size when using crc-rs?

Accepted Answer

Use the NoTable implementation to minimize size, or wrap Crc initialization in a std::cell::OnceCell to defer table generation and reduce compile-time binary bloat, as suggested in the README. This is crucial for embedded or resource-constrained environments.

Question 3

What's the fastest CRC implementation in crc-rs for 32-bit checksums?

Accepted Answer

The Table<16> implementation, labeled Slice16 in benchmarks, provides the highest throughput at up to 3.30 GiB/s for 32-bit CRC. However, it uses more memory and increases binary size, so trade-offs must be considered.

Question 4

Does crc-rs support the CRC-32C (Castagnoli) algorithm?

Accepted Answer

Yes, crc-rs likely supports CRC-32C through custom parameters if not explicitly listed as a pre-defined constant. Check the crate documentation for specific algorithms or use the custom algorithm feature with the correct polynomial.

Question 5

How do I define a custom CRC algorithm with crc-rs?

Accepted Answer

Define a crc::Algorithm struct with fields like width, poly, init, etc., as shown in the README example, then create a Crc instance with it. This allows full control over CRC parameters for specialized use cases.

Question 6

Is crc-rs suitable for embedded systems with low memory?

Accepted Answer

Yes, especially with the NoTable implementation which avoids lookup tables, minimizing memory usage. However, for performance, the table-based implementations might be too memory-intensive, so careful selection is needed.

crc-rs

What is crc-rs?

Overview

Use Cases

Best For

Related Projects

Found a gem we're missing?

Not Ideal For

Pros & Cons

Pros

Cons

Frequently Asked Questions