PHP's crc32 in JavaScript

How to use

You you can install via yarn add locutus and require this function via const crc32 = require('locutus/php/strings/crc32').

It is important to use a bundler that supports tree-shaking so that you only ship the functions that you actually use to your browser, instead of all of Locutus, which is massive. Examples are: Parcel, webpack, or rollup.js. For server-side use this is typically less of a concern.

Examples

Please note that these examples are distilled from test cases that automatically verify our functions still work correctly. This could explain some quirky ones.

#	code	expected result
1	crc32('Kevin van Zonneveld')	1249991249

Here’s what our current JavaScript equivalent to PHP's crc32 looks like.

module.exports = function crc32(str) {
  //  discuss at: https://locutus.io/php/crc32/
  // original by: Webtoolkit.info (https://www.webtoolkit.info/)
  // improved by: T0bsn
  //   example 1: crc32('Kevin van Zonneveld')
  //   returns 1: 1249991249

  const utf8Encode = require('../xml/utf8_encode')
  str = utf8Encode(str)
  const table = [
    '00000000',
    '77073096',
    'EE0E612C',
    '990951BA',
    '076DC419',
    '706AF48F',
    'E963A535',
    '9E6495A3',
    '0EDB8832',
    '79DCB8A4',
    'E0D5E91E',
    '97D2D988',
    '09B64C2B',
    '7EB17CBD',
    'E7B82D07',
    '90BF1D91',
    '1DB71064',
    '6AB020F2',
    'F3B97148',
    '84BE41DE',
    '1ADAD47D',
    '6DDDE4EB',
    'F4D4B551',
    '83D385C7',
    '136C9856',
    '646BA8C0',
    'FD62F97A',
    '8A65C9EC',
    '14015C4F',
    '63066CD9',
    'FA0F3D63',
    '8D080DF5',
    '3B6E20C8',
    '4C69105E',
    'D56041E4',
    'A2677172',
    '3C03E4D1',
    '4B04D447',
    'D20D85FD',
    'A50AB56B',
    '35B5A8FA',
    '42B2986C',
    'DBBBC9D6',
    'ACBCF940',
    '32D86CE3',
    '45DF5C75',
    'DCD60DCF',
    'ABD13D59',
    '26D930AC',
    '51DE003A',
    'C8D75180',
    'BFD06116',
    '21B4F4B5',
    '56B3C423',
    'CFBA9599',
    'B8BDA50F',
    '2802B89E',
    '5F058808',
    'C60CD9B2',
    'B10BE924',
    '2F6F7C87',
    '58684C11',
    'C1611DAB',
    'B6662D3D',
    '76DC4190',
    '01DB7106',
    '98D220BC',
    'EFD5102A',
    '71B18589',
    '06B6B51F',
    '9FBFE4A5',
    'E8B8D433',
    '7807C9A2',
    '0F00F934',
    '9609A88E',
    'E10E9818',
    '7F6A0DBB',
    '086D3D2D',
    '91646C97',
    'E6635C01',
    '6B6B51F4',
    '1C6C6162',
    '856530D8',
    'F262004E',
    '6C0695ED',
    '1B01A57B',
    '8208F4C1',
    'F50FC457',
    '65B0D9C6',
    '12B7E950',
    '8BBEB8EA',
    'FCB9887C',
    '62DD1DDF',
    '15DA2D49',
    '8CD37CF3',
    'FBD44C65',
    '4DB26158',
    '3AB551CE',
    'A3BC0074',
    'D4BB30E2',
    '4ADFA541',
    '3DD895D7',
    'A4D1C46D',
    'D3D6F4FB',
    '4369E96A',
    '346ED9FC',
    'AD678846',
    'DA60B8D0',
    '44042D73',
    '33031DE5',
    'AA0A4C5F',
    'DD0D7CC9',
    '5005713C',
    '270241AA',
    'BE0B1010',
    'C90C2086',
    '5768B525',
    '206F85B3',
    'B966D409',
    'CE61E49F',
    '5EDEF90E',
    '29D9C998',
    'B0D09822',
    'C7D7A8B4',
    '59B33D17',
    '2EB40D81',
    'B7BD5C3B',
    'C0BA6CAD',
    'EDB88320',
    '9ABFB3B6',
    '03B6E20C',
    '74B1D29A',
    'EAD54739',
    '9DD277AF',
    '04DB2615',
    '73DC1683',
    'E3630B12',
    '94643B84',
    '0D6D6A3E',
    '7A6A5AA8',
    'E40ECF0B',
    '9309FF9D',
    '0A00AE27',
    '7D079EB1',
    'F00F9344',
    '8708A3D2',
    '1E01F268',
    '6906C2FE',
    'F762575D',
    '806567CB',
    '196C3671',
    '6E6B06E7',
    'FED41B76',
    '89D32BE0',
    '10DA7A5A',
    '67DD4ACC',
    'F9B9DF6F',
    '8EBEEFF9',
    '17B7BE43',
    '60B08ED5',
    'D6D6A3E8',
    'A1D1937E',
    '38D8C2C4',
    '4FDFF252',
    'D1BB67F1',
    'A6BC5767',
    '3FB506DD',
    '48B2364B',
    'D80D2BDA',
    'AF0A1B4C',
    '36034AF6',
    '41047A60',
    'DF60EFC3',
    'A867DF55',
    '316E8EEF',
    '4669BE79',
    'CB61B38C',
    'BC66831A',
    '256FD2A0',
    '5268E236',
    'CC0C7795',
    'BB0B4703',
    '220216B9',
    '5505262F',
    'C5BA3BBE',
    'B2BD0B28',
    '2BB45A92',
    '5CB36A04',
    'C2D7FFA7',
    'B5D0CF31',
    '2CD99E8B',
    '5BDEAE1D',
    '9B64C2B0',
    'EC63F226',
    '756AA39C',
    '026D930A',
    '9C0906A9',
    'EB0E363F',
    '72076785',
    '05005713',
    '95BF4A82',
    'E2B87A14',
    '7BB12BAE',
    '0CB61B38',
    '92D28E9B',
    'E5D5BE0D',
    '7CDCEFB7',
    '0BDBDF21',
    '86D3D2D4',
    'F1D4E242',
    '68DDB3F8',
    '1FDA836E',
    '81BE16CD',
    'F6B9265B',
    '6FB077E1',
    '18B74777',
    '88085AE6',
    'FF0F6A70',
    '66063BCA',
    '11010B5C',
    '8F659EFF',
    'F862AE69',
    '616BFFD3',
    '166CCF45',
    'A00AE278',
    'D70DD2EE',
    '4E048354',
    '3903B3C2',
    'A7672661',
    'D06016F7',
    '4969474D',
    '3E6E77DB',
    'AED16A4A',
    'D9D65ADC',
    '40DF0B66',
    '37D83BF0',
    'A9BCAE53',
    'DEBB9EC5',
    '47B2CF7F',
    '30B5FFE9',
    'BDBDF21C',
    'CABAC28A',
    '53B39330',
    '24B4A3A6',
    'BAD03605',
    'CDD70693',
    '54DE5729',
    '23D967BF',
    'B3667A2E',
    'C4614AB8',
    '5D681B02',
    '2A6F2B94',
    'B40BBE37',
    'C30C8EA1',
    '5A05DF1B',
    '2D02EF8D',
  ].join(' ')
  // @todo: ^-- Now that `table` is an array, maybe we can use that directly using slices,
  // instead of converting it to a string and substringing

  let crc = 0
  let x = 0
  let y = 0

  crc = crc ^ -1
  for (let i = 0, iTop = str.length; i < iTop; i++) {
    y = (crc ^ str.charCodeAt(i)) & 0xff
    x = '0x' + table.substr(y * 9, 8)
    crc = (crc >>> 8) ^ x
  }

  return crc ^ -1
}

A community effort

Not unlike Wikipedia, Locutus is an ongoing community effort. Our philosophy follows The McDonald’s Theory. This means that we assimilate first iterations with imperfections, hoping for others to take issue with-and improve them. This unorthodox approach has worked very well to foster fun and fruitful collaboration, but please be reminded to use our creations at your own risk. THE SOFTWARE IS PROVIDED "AS IS" has never been more true than for Locutus.

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