crc32

Standard CRC-32 algorithm implementation in JS (for the browser and nodejs). Emphasis on correctness and performance.

Installation

In nodejs:

npm install crc-32

In the browser:

<script lang="javascript" src="crc32.js"></script>

The browser exposes a variable CRC32

Usage

• CRC32.buf(byte array or buffer) assumes the argument is a set of 8 bit unsigned integers (e.g. nodejs Buffer or simple array of ints)

• CRC32.bstr(binary string) interprets the argument as a binary string where the i-th byte is str.charCodeAt(i)

• CRC32.str(string) interprets the argument as a standard JS string

Testing

make test will run the nodejs-based test. To run the in-browser tests, run a local server and go to the ctest directory. To update the browser artifacts, run make ctest.

Performance

make perf will run performance tests.

In the future ...

• Specifying an arbitrary initial CRC value

• Supporting different polynomials (e.g. CRC32C)

License

Please consult the attached LICENSE file for details. All rights not explicitly granted by the Apache 2.0 license are reserved by the Original Author.