Configring node js.

node_modules/jszip/lib/crc32.js

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+'use strict';
+
+var utils = require('./utils');
+
+/**
+ * The following functions come from pako, from pako/lib/zlib/crc32.js
+ * released under the MIT license, see pako https://github.com/nodeca/pako/
+ */
+
+// Use ordinary array, since untyped makes no boost here
+function makeTable() {
+    var c, table = [];
+
+    for(var n =0; n < 256; n++){
+        c = n;
+        for(var k =0; k < 8; k++){
+            c = ((c&1) ? (0xEDB88320 ^ (c >>> 1)) : (c >>> 1));
+        }
+        table[n] = c;
+    }
+
+    return table;
+}
+
+// Create table on load. Just 255 signed longs. Not a problem.
+var crcTable = makeTable();
+
+
+function crc32(crc, buf, len, pos) {
+    var t = crcTable, end = pos + len;
+
+    crc = crc ^ (-1);
+
+    for (var i = pos; i < end; i++ ) {
+        crc = (crc >>> 8) ^ t[(crc ^ buf[i]) & 0xFF];
+    }
+
+    return (crc ^ (-1)); // >>> 0;
+}
+
+// That's all for the pako functions.
+
+/**
+ * Compute the crc32 of a string.
+ * This is almost the same as the function crc32, but for strings. Using the
+ * same function for the two use cases leads to horrible performances.
+ * @param {Number} crc the starting value of the crc.
+ * @param {String} str the string to use.
+ * @param {Number} len the length of the string.
+ * @param {Number} pos the starting position for the crc32 computation.
+ * @return {Number} the computed crc32.
+ */
+function crc32str(crc, str, len, pos) {
+    var t = crcTable, end = pos + len;
+
+    crc = crc ^ (-1);
+
+    for (var i = pos; i < end; i++ ) {
+        crc = (crc >>> 8) ^ t[(crc ^ str.charCodeAt(i)) & 0xFF];
+    }
+
+    return (crc ^ (-1)); // >>> 0;
+}
+
+module.exports = function crc32wrapper(input, crc) {
+    if (typeof input === "undefined" || !input.length) {
+        return 0;
+    }
+
+    var isArray = utils.getTypeOf(input) !== "string";
+
+    if(isArray) {
+        return crc32(crc|0, input, input.length, 0);
+    } else {
+        return crc32str(crc|0, input, input.length, 0);
+    }
+};