buffer-crc32

crc32 that works with binary data and fancy character sets, outputs buffer, signed or unsigned data and has tests.

Derived from the sample CRC implementation in the PNG specification: http://www.w3.org/TR/PNG/#D-CRCAppendix

This package requires Node 8+ to work.

install

npm install buffer-crc32

example

const crc32 = require('buffer-crc32');
// works with buffers
const buf = Buffer([0x00, 0x73, 0x75, 0x70, 0x20, 0x62, 0x72, 0x6f, 0x00]);
crc32(buf); // -> <Buffer 94 5a ab 4a>

// has convenience methods for getting signed or unsigned ints
crc32.signed(buf); // -> -1805997238
crc32.unsigned(buf); // -> 2488970058

// will cast to buffer if given a string, so you can
// directly use foreign characters safely
crc32('自動販売機'); // -> <Buffer cb 03 1a c5>

// and works in append mode too
const partialCrc = crc32('hey');
const partialCrc = crc32(' ', partialCrc);
const partialCrc = crc32('sup', partialCrc);
const partialCrc = crc32(' ', partialCrc);
const finalCrc = crc32('bros', partialCrc); // -> <Buffer 47 fa 55 70>

tests

This was tested against the output of zlib's crc32 method. You can run the tests withnpm test (requires tap)

see also

https://github.com/alexgorbatchev/node-crc, crc.buffer.crc32 also supports buffer inputs and return unsigned ints (thanks @tjholowaychuk).

license

MIT/X11

Current Tags

• 1.0.0                                ...           latest (a year ago)
• 1.0.0-RC9                                ...           next (a year ago)

24 Versions

• 1.0.0                                ...           a year ago
• 1.0.0-RC9                                ...           a year ago
• 1.0.0-RC8                                ...           a year ago
• 1.0.0-RC7                                ...           a year ago
• 1.0.0-RC5                                ...           a year ago
• 1.0.0-RC4                                ...           a year ago
• 1.0.0-RC3                                ...           a year ago
• 1.0.0-RC2                                ...           a year ago
• 1.0.0-RC1                                ...           a year ago
• 0.2.13                                ...           8 years ago
• 0.2.12                                ...           8 years ago
• 0.2.11                                ...           8 years ago
• 0.2.10                                ...           8 years ago
• 0.2.9                                ...           8 years ago
• 0.2.8                                ...           8 years ago
• 0.2.7                                ...           8 years ago
• 0.2.6                                ...           8 years ago
• 0.2.5                                ...           10 years ago
• 0.2.4                                ...           10 years ago
• 0.2.3                                ...           11 years ago
• 0.2.1                                ...           12 years ago
• 0.2.0                                ...           12 years ago
• 0.1.1                                ...           12 years ago
• 0.1.0                                ...           12 years ago