Standard CRC-32 algorithm implementation in JS (for the browser and nodejs). Emphasis on correctness and performance.
npm install crc-32
In the browser:
The browser exposes a variable CRC32
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
i-th byte is
CRC32.str(string) interprets the argument as a standard JS string
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,
make perf will run algorithmic performance tests (which should justify certain
decisions in the code).
make perf-all compares the performance of various crc-32 algorithms that
implement the correct form (note that the SSE intrinsic is designed for the
CRC32C checksum and uses a different polynomial).
Unexpected code patterns were based on performance testing in node and browser:
Specifying an arbitrary initial CRC value
Supporting different polynomials (e.g. CRC32C)
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.