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How to use the crc32 function from crc

Find comprehensive JavaScript crc.crc32 code examples handpicked from public code repositorys.

crc.crc32 is a function in the crc module that calculates the CRC-32 checksum of a given input.

wallet-address-validator.js

GitHub: christsim/multicoin-address-validator

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    if (typeof (validCrc) != 'number') {
        return false;
    }


    // get crc of the payload
    var crc = CRC.crc32(tagged);


    return crc == validCrc;
}

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commands.js

GitHub: Ocelotworks/OcelotBOTv5

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try {
    const module = `${__dirname}/../commands/${command}`;
    if (reload) {
        delete require.cache[require.resolve(module)];
    }
    let crc = crc32(fs.readFileSync(module, 'utf8')).toString(16);
    let loadedCommand = require(module);
    // Class-type
    if(loadedCommand instanceof Function){
        loadedCommand = new loadedCommand(this.bot);

+ 4 other calls in file

How does crc.crc32 work?

When you use crc.crc32 in your JavaScript code, you are using a function that calculates the CRC-32 checksum of a given input. CRC-32 is a widely used checksum algorithm that can be used to detect errors in data transmission or storage. It works by calculating a cyclic redundancy check (CRC) value for the input data, which is a fixed-size checksum that can be used to verify the integrity of the data. To use crc.crc32, you pass a string or buffer representing the input data as the first argument. You can also pass an optional second argument, which is the initial CRC value (defaults to 0xffffffff). Here is an example of using crc.crc32 to calculate the CRC-32 checksum of a string: javascript Copy code {{{{{{{ const crc = require('crc'); const inputString = 'hello world'; const crcValue = crc.crc32(inputString); console.log(crcValue.toString(16)); In this example, we are using crc.crc32 to calculate the CRC-32 checksum of the input string 'hello world'. The resulting CRC value is a number that can be converted to hexadecimal using the toString method. The output of this code will be: Copy code {{{{{{{ class="!whitespace-pre hljs">4f2c5d4d This is the CRC-32 checksum of the input string. Overall, crc.crc32 provides a simple and powerful way to calculate the CRC-32 checksum of data in JavaScript, allowing you to verify the integrity of data transmissions and storage.

rest-datasets.js

GitHub: data-fair/data-fair

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if (validate && !validate(body)) {
  await new Promise(resolve => setTimeout(resolve, 0)) // non-blocking in case of large series of errors
  result._error = validate.errors
  result._status = 400
} else {
  extendedBody._hash = crc32(stableStringify(body)).toString(16)
  const filter = { _id: body._id, _hash: { $ne: extendedBody._hash }, ...linesOwnerFilter(req) }
  bulkOp.find(filter).upsert().replaceOne(extendedBody)
  hasBulkOp = true
}

SourceFile.js

GitHub: eserozvataf/sey

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class SourceFile {
    constructor(file, hash, content) {
        this.file = file;


        if (hash === undefined) {
            this.hash = crc.crc32(String(fsManager.getLastMod(file.fullpath)), crc.crc32(file.fullpath));
        } else {
            this.hash = hash;
        }

Ai Example

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const crc = require("crc");

const inputString = "hello world";
const crcValue = crc.crc32(inputString);
console.log(crcValue.toString(16));

In this example, we are using crc.crc32 to calculate the CRC-32 checksum of the input string 'hello world'. The resulting CRC value is a number that can be converted to hexadecimal using the toString method. The output of this code will be: Copy code

upload.js

GitHub: peteward44/gulp-artifactory-upload

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		data += response.toString();
	}); 
	req.on('end', function(string){
		var downloadedCrc = crc.crc32( data );
		var original = fs.readFileSync( file, { encoding: 'ascii' } );
		var originalCrc = crc.crc32( original );
		downloadedCrc.should.equal( originalCrc );
		done();
	});
};

+ 3 other calls in file

lib.js

GitHub: MetacoinPlatform/metacoin-node

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}

if (addr.slice(0, 2) != "MT") {
    return false;
}
let checksum = "00000000" + crc32(addr.slice(2, 32)).toString(16);
if (addr.slice(32, 40) != checksum.slice(-8)) {
    return false;
}
return true;

actions.js

GitHub: CSS-Electronics/config-editor-base

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return function (dispatch, getState) {
  let formData = getState().editor.formData;

  if (crcBrowserSupport == 1 && formData) {
    const { crc32 } = require("crc");
    let crc32EditorLive = crc32(JSON.stringify(formData, null, 2))
      .toString(16)
      .toUpperCase()
      .padStart(8, "0");

+ 13 other calls in file

etl-tran-calc.js

GitHub: yanmingsohu/xBoson-virtuoso

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  },


//////// -----------------------------------/ 校验运算 /---//


  'c1': function(a, b, format) {
    return crc.crc32(String(a)).toString(format || 16);
  },


  'c2': function(a, b, format) {
    var h = crypto.createHash('md5');

helpers.js

GitHub: MikeHibbert/evermore

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return new Promise((resolve, reject) => {
    let crc_result = '';
    const readStream = fs.createReadStream(file_path);

    readStream.on('data', (chunk) => {
        crc_result = crc32(chunk, crc_result).toString(16);
    });

    readStream.on('end', () => {
        return resolve(crc_result);

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