Merged esm branch into feature-magic. Ported FileType ops.

src/core/operations/FromBase32.mjs

@@ -0,0 +1,97 @@
+/**
+ * @author n1474335 [n1474335@gmail.com]
+ * @copyright Crown Copyright 2016
+ * @license Apache-2.0
+ */
+
+import Operation from "../Operation";
+import Utils from "../Utils";
+
+/**
+ * From Base32 operation
+ */
+class FromBase32 extends Operation {
+
+    /**
+     * FromBase32 constructor
+     */
+    constructor() {
+        super();
+
+        this.name = "From Base32";
+        this.module = "Default";
+        this.description = "Base32 is a notation for encoding arbitrary byte data using a restricted set of symbols that can be conveniently used by humans and processed by computers. It uses a smaller set of characters than Base64, usually the uppercase alphabet and the numbers 2 to 7.";
+        this.inputType = "string";
+        this.outputType = "byteArray";
+        this.args = [
+            {
+                name: "Alphabet",
+                type: "binaryString",
+                value: "A-Z2-7="
+            },
+            {
+                name: "Remove non-alphabet chars",
+                type: "boolean",
+                value: true
+            }
+        ];
+        this.patterns = [
+            {
+                match: "^(?:[A-Z2-7]{8})+(?:[A-Z2-7]{2}={6}|[A-Z2-7]{4}={4}|[A-Z2-7]{5}={3}|[A-Z2-7]{7}={1})?$",
+                flags: "",
+                args: ["A-Z2-7=", false]
+            },
+        ];
+    }
+
+    /**
+     * @param {string} input
+     * @param {Object[]} args
+     * @returns {byteArray}
+     */
+    run(input, args) {
+        if (!input) return [];
+
+        const alphabet = args[0] ?
+                Utils.expandAlphRange(args[0]).join("") : "ABCDEFGHIJKLMNOPQRSTUVWXYZ234567=",
+            removeNonAlphChars = args[1],
+            output = [];
+
+        let chr1, chr2, chr3, chr4, chr5,
+            enc1, enc2, enc3, enc4, enc5, enc6, enc7, enc8,
+            i = 0;
+
+        if (removeNonAlphChars) {
+            const re = new RegExp("[^" + alphabet.replace(/[\]\\\-^]/g, "\\$&") + "]", "g");
+            input = input.replace(re, "");
+        }
+
+        while (i < input.length) {
+            enc1 = alphabet.indexOf(input.charAt(i++));
+            enc2 = alphabet.indexOf(input.charAt(i++) || "=");
+            enc3 = alphabet.indexOf(input.charAt(i++) || "=");
+            enc4 = alphabet.indexOf(input.charAt(i++) || "=");
+            enc5 = alphabet.indexOf(input.charAt(i++) || "=");
+            enc6 = alphabet.indexOf(input.charAt(i++) || "=");
+            enc7 = alphabet.indexOf(input.charAt(i++) || "=");
+            enc8 = alphabet.indexOf(input.charAt(i++) || "=");
+
+            chr1 = (enc1 << 3) | (enc2 >> 2);
+            chr2 = ((enc2 & 3) << 6) | (enc3 << 1) | (enc4 >> 4);
+            chr3 = ((enc4 & 15) << 4) | (enc5 >> 1);
+            chr4 = ((enc5 & 1) << 7) | (enc6 << 2) | (enc7 >> 3);
+            chr5 = ((enc7 & 7) << 5) | enc8;
+
+            output.push(chr1);
+            if (enc2 & 3 !== 0 || enc3 !== 32) output.push(chr2);
+            if (enc4 & 15 !== 0 || enc5 !== 32) output.push(chr3);
+            if (enc5 & 1 !== 0 || enc6 !== 32) output.push(chr4);
+            if (enc7 & 7 !== 0 || enc8 !== 32) output.push(chr5);
+        }
+
+        return output;
+    }
+
+}
+
+export default FromBase32;