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    buffer-crc32
    DefinitelyTyped icon, indicating that this package has TypeScript declarations provided by the separate @types/buffer-crc32 package

    0.2.13 • Public • Published

    buffer-crc32

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    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

    install

    npm install buffer-crc32
    

    example

    var crc32 = require('buffer-crc32');
    // works with buffers
    var 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
    var partialCrc = crc32('hey');
    var partialCrc = crc32(' ', partialCrc);
    var partialCrc = crc32('sup', partialCrc);
    var partialCrc = crc32(' ', partialCrc);
    var 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

    Keywords

    none

    Install

    npm i buffer-crc32

    DownloadsWeekly Downloads

    10,229,081

    Version

    0.2.13

    License

    MIT

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