morefun-forerunnerdb
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A NoSQL document store database for browsers and Node.js.
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<title>JSDoc: Source: Checksum.js</title>
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<h1 class="page-title">Source: Checksum.js</h1>
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<pre class="prettyprint source linenums"><code>"use strict";
var crcTable,
checksum;
crcTable = (function () {
var crcTable = [],
c, n, k;
for (n = 0; n < 256; n++) {
c = n;
for (k = 0; k < 8; k++) {
c = ((c & 1) ? (0xEDB88320 ^ (c >>> 1)) : (c >>> 1)); // jshint ignore:line
}
crcTable[n] = c;
}
return crcTable;
}());
/**
* Returns a checksum of a string.
* @param {String} str The string to checksum.
* @return {Number} The checksum generated.
*/
checksum = function(str) {
var crc = 0 ^ (-1), // jshint ignore:line
i;
for (i = 0; i < str.length; i++) {
crc = (crc >>> 8) ^ crcTable[(crc ^ str.charCodeAt(i)) & 0xFF]; // jshint ignore:line
}
return (crc ^ (-1)) >>> 0; // jshint ignore:line
};
module.exports = checksum;</code></pre>
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