JavaScript implementation of base64 encoding.

base64Encode.js

function base64Encode (data) {
	var encoded = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/',
		chars, bin,
		output = '',
		i;

	while (data) {
		chars = data.substr (0, 3) + String.fromCharCode (0, 0);
		bin = '';

		for (i = 0; i < 3; i++) bin += ('0000000' + chars.charCodeAt (i).toString (2)).substr (-8);
		for (i = 0; i < 4; i++) output += encoded.substr (parseInt (bin.substr (i * 6, 6), 2), 1);

		data = data.substr (3);			
	}
	
	return output;
}