Test succeeds

README.md

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+Intro
+=====
+
+`base64-js` does basic base64 encoding/decoding in pure JS. Many browsers already have this functionality, but it is for text data, not all-purpose binary data.
+
+Sometimes encoding/decoding binary data in the browser is useful, and that is what this module does.
+
+API
+===
+
+`base64-js` has two exposed functions, `toByteArray` and `fromByteArray`, which both take a single argument.
+
+* toByteArray- Takes a base64 string and returns a byte array
+* fromByteArray- Takes a byte array and returns a base64 string

lib/b64.js

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+(function (exports) {
+	'use strict';
+
+	var lookup = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
+
+	function b64ToByteArray(b64) {
+		var i, l, tmp, hasPadding, arr = [];
+
+		if (i % 4 > 0) {
+			throw 'Invalid string. Length must be a multiple of 4';
+		}
+
+		hasPadding = /=$/.test(b64);
+
+		l = hasPadding ? b64.length - 4: b64.length;
+
+		for (i = 0; i < l; i += 4) {
+			tmp = (lookup.indexOf(b64[i]) << 18) | (lookup.indexOf(b64[i + 1]) << 12) | (lookup.indexOf(b64[i + 2]) << 6) | lookup.indexOf(b64[i + 3]);
+			arr.push((tmp & 0xFF0000) >> 16);
+			arr.push((tmp & 0xFF00) >> 8);
+			arr.push(tmp & 0xFF);
+		}
+
+		if (hasPadding) {
+			b64 = b64.substring(i, b64.indexOf('='));
+
+			if (b64.length === 2) {
+				tmp = (lookup.indexOf(b64[0]) << 2) | (lookup.indexOf(b64[1]) >> 4);
+				arr.push(tmp & 0xFF);
+			} else {
+				tmp = (lookup.indexOf(b64[0]) << 10) | (lookup.indexOf(b64[1]) << 4) | (lookup.indexOf(b64[2]) >> 2);
+				arr.push((tmp >> 8) & 0xFF);
+				arr.push(tmp & 0xFF);
+			}
+		}
+
+		return arr;
+	}
+
+	function uint8ToBase64(uint8) {
+		var i,
+			extraBytes = uint8.length % 3, // if we have 1 byte left, pad 2 bytes
+			output = "",
+			temp, length;
+
+		function tripletToBase64 (num) {
+			return lookup[num >> 18 & 0x3F] + lookup[num >> 12 & 0x3F] + lookup[num >> 6 & 0x3F] + lookup[num & 0x3F];
+		};
+
+		// go through the array every three bytes, we'll deal with trailing stuff later
+		for (i = 0, length = uint8.length - extraBytes; i < length; i += 3) {
+			temp = (uint8[i] << 16) + (uint8[i + 1] << 8) + (uint8[i + 2]);
+			output += tripletToBase64(temp);
+		}
+
+		// pad the end with zeros, but make sure to not forget the extra bytes
+		switch (extraBytes) {
+			case 1:
+				temp = uint8[uint8.length - 1];
+				output += lookup[temp >> 2];
+				output += lookup[(temp << 4) & 0x3F];
+				output += '==';
+				break;
+			case 2:
+				temp = (uint8[uint8.length - 2] << 8) + (uint8[uint8.length - 1]);
+				output += lookup[temp >> 10];
+				output += lookup[(temp >> 4) & 0x3F];
+				output += lookup[(temp << 2) & 0x3F];
+				output += '=';
+				break;
+		}
+
+		return output;
+	}
+
+	module.exports.toByteArray = b64ToByteArray;
+	module.exports.fromByteArray = uint8ToBase64;
+}());

package.json

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+{
+	"author": "T. Jameson Little <t.jameson.little@gmail.com>",
+	"name": "base64-js",
+	"description": "Base64 encoding/decoding in pure JS",
+	"version": "0.0.1",
+	"repository": {
+		"type": "git",
+		"url": "git://github.com/beatgammit/deflate-js.git"
+	},
+	"main": "lib/b64.js",
+	"scripts": {
+		"test": "cd test; node runner.js; cd -"
+	},
+	"engines": {
+		"node": ">= 0.4"
+	},
+	"dependencies": {},
+	"devDependencies": {}
+}

test/runner.js

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+(function () {
+	'use strict';
+
+	var b64 = require('../lib/b64'),
+		checks = [
+			'a',
+			'aa',
+			'aaa',
+			'hi',
+			'hi!',
+			'hi!!',
+			'sup',
+			'sup?',
+			'sup?!'
+		],
+		res;
+
+	res = checks.some(function (check) {
+		var b64Str,
+			arr,
+			str;
+
+		b64Str = b64.fromByteArray(Array.prototype.map.call(check, function (char) { return char.charCodeAt(0); }));
+
+		arr = b64.toByteArray(b64Str);
+		str = arr.map(function (byte) { return String.fromCharCode(byte); }).join('');
+		if (check !== str) {
+			console.log('Fail:', check);
+			console.log('Base64:', b64Str);
+			return true;
+		}
+	});
+
+	if (res) {
+		console.log('Test failed');
+	} else {
+		console.log('All tests passed!');
+	}
+}());