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/* Copyright (C) 1999 Masanao Izumo <iz@onicos.co.jp>
* Version: 1.0
* LastModified: Dec 25 1999
* This library is free. You can redistribute it and/or modify it.
*/
/* modified by Kris Kowal to add support for Binary for Narwhal */
var encodeChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
var decodeChars = [
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63,
52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1,
-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1,
-1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1
];
var binary = require('binary');
exports.encode = function (str) {
var out, i, length;
var c1, c2, c3;
length = len(str);
i = 0;
out = [];
while(i < length) {
c1 = str.charCodeAt(i++) & 0xff;
if(i == length)
{
out.push(encodeChars.charCodeAt(c1 >> 2));
out.push(encodeChars.charCodeAt((c1 & 0x3) << 4));
out.push("=".charCodeAt(0));
out.push("=".charCodeAt(0));
break;
}
c2 = str.charCodeAt(i++);
if(i == length)
{
out.push(encodeChars.charCodeAt(c1 >> 2));
out.push(encodeChars.charCodeAt(((c1 & 0x3)<< 4) | ((c2 & 0xF0) >> 4)));
out.push(encodeChars.charCodeAt((c2 & 0xF) << 2));
out.push("=".charCodeAt(0));
break;
}
c3 = str.charCodeAt(i++);
out.push(encodeChars.charCodeAt(c1 >> 2));
out.push(encodeChars.charCodeAt(((c1 & 0x3)<< 4) | ((c2 & 0xF0) >> 4)));
out.push(encodeChars.charCodeAt(((c2 & 0xF) << 2) | ((c3 & 0xC0) >>6)));
out.push(encodeChars.charCodeAt(c3 & 0x3F));
}
return binary.ByteString(out).toString('ascii');
};
exports.decode = function (str) {
var c1, c2, c3, c4;
var i, length, out;
length = len(str);
i = 0;
out = [];
while(i < length) {
/* c1 */
do {
c1 = decodeChars[str.charCodeAt(i++) & 0xff];
} while(i < length && c1 == -1);
if(c1 == -1)
break;
/* c2 */
do {
c2 = decodeChars[str.charCodeAt(i++) & 0xff];
} while(i < length && c2 == -1);
if(c2 == -1)
break;
out.push(String.fromCharCode((c1 << 2) | ((c2 & 0x30) >> 4)));
/* c3 */
do {
c3 = str.charCodeAt(i++) & 0xff;
if(c3 == 61)
return out.join('');
c3 = decodeChars[c3];
} while(i < length && c3 == -1);
if(c3 == -1)
break;
out.push(String.fromCharCode(((c2 & 0xF) << 4) | ((c3 & 0x3C) >> 2)));
/* c4 */
do {
c4 = str.charCodeAt(i++) & 0xff;
if(c4 == 61)
return out.join('');
c4 = decodeChars[c4];
} while(i < length && c4 == -1);
if(c4 == -1)
break;
out.push(String.fromCharCode(((c3 & 0x03) << 6) | c4));
}
return out.join('');
};
var len = function (object) {
if (object.length !== undefined) {
return object.length;
} else if (object.getLength !== undefined) {
return object.getLength();
} else {
return undefined;
}
};
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