34 lines
1,000 B
JavaScript
34 lines
1,000 B
JavaScript
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export function crc32(str) {
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var crcTable = [];
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for (var i = 0; i < 256; i++) {
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var crc = i;
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for (var j = 8; j > 0; j--) {
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if (crc & 1) {
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crc = (crc >>> 1) ^ 0xEDB88320;
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} else {
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crc = crc >>> 1;
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}
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}
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crcTable[i] = crc;
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}
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var crc32val = 0xFFFFFFFF;
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for (var i = 0; i < str.length; i++) {
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var charCode = str.charCodeAt(i);
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crc32val = (crc32val >>> 8) ^ crcTable[(crc32val ^ charCode) & 0xFF];
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}
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return (crc32val ^ 0xFFFFFFFF) >>> 0;
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}
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export function randomCrc32String(length = 8) {
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var characters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
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var randomStr = '';
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for (var i = 0; i < length; i++) {
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randomStr += characters.charAt(Math.floor(Math.random() * characters.length));
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}
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return crc32(randomStr).toString(16); // Convert to hexadecimal string
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}
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console.log(randomCrc32String()); // Example usage
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