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/*jslint adsafe: false, bitwise: true, browser: true, cap: false, css: false,
debug: false, devel: true, eqeqeq: true, es5: false, evil: false,
forin: false, fragment: false, immed: true, laxbreak: false, newcap: true,
nomen: false, on: false, onevar: true, passfail: false, plusplus: true,
regexp: false, rhino: true, safe: false, strict: false, sub: false,
undef: true, white: false, widget: false, windows: false */
/*global jQuery: false, window: false */
//"use strict";
/*
* Original code (c) 2010 Nick Galbreath
* http://code.google.com/p/stringencoders/source/browse/#svn/trunk/javascript
*
* jQuery port (c) 2010 Carlo Zottmann
* http://github.com/carlo/jquery-base64
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following
* conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
/* base64 encode/decode compatible with window.btoa/atob
*
* window.atob/btoa is a Firefox extension to convert binary data (the "b")
* to base64 (ascii, the "a").
*
* It is also found in Safari and Chrome. It is not available in IE.
*
* if (!window.btoa) window.btoa = $.base64.encode
* if (!window.atob) window.atob = $.base64.decode
*
* The original spec's for atob/btoa are a bit lacking
* https://developer.mozilla.org/en/DOM/window.atob
* https://developer.mozilla.org/en/DOM/window.btoa
*
* window.btoa and $.base64.encode takes a string where charCodeAt is [0,255]
* If any character is not [0,255], then an exception is thrown.
*
* window.atob and $.base64.decode take a base64-encoded string
* If the input length is not a multiple of 4, or contains invalid characters
* then an exception is thrown.
*/
jQuery.base64 = ( function( $ ) {
var _PADCHAR = "=",
_ALPHA = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/",
_VERSION = "1.0";
function _getbyte64( s, i ) {
// This is oddly fast, except on Chrome/V8.
// Minimal or no improvement in performance by using a
// object with properties mapping chars to value (eg. 'A': 0)
var idx = _ALPHA.indexOf( s.charAt( i ) );
if ( idx === -1 ) {
throw "Cannot decode base64";
}
return idx;
}
function _decode( s ) {
var pads = 0,
i,
b10,
imax = s.length,
x = [];
s = String( s );
if ( imax === 0 ) {
return s;
}
if ( imax % 4 !== 0 ) {
throw "Cannot decode base64";
}
if ( s.charAt( imax - 1 ) === _PADCHAR ) {
pads = 1;
if ( s.charAt( imax - 2 ) === _PADCHAR ) {
pads = 2;
}
// either way, we want to ignore this last block
imax -= 4;
}
for ( i = 0; i < imax; i += 4 ) {
b10 = ( _getbyte64( s, i ) << 18 ) | ( _getbyte64( s, i + 1 ) << 12 ) | ( _getbyte64( s, i + 2 ) << 6 ) | _getbyte64( s, i + 3 );
x.push( String.fromCharCode( b10 >> 16, ( b10 >> 8 ) & 0xff, b10 & 0xff ) );
}
switch ( pads ) {
case 1:
b10 = ( _getbyte64( s, i ) << 18 ) | ( _getbyte64( s, i + 1 ) << 12 ) | ( _getbyte64( s, i + 2 ) << 6 );
x.push( String.fromCharCode( b10 >> 16, ( b10 >> 8 ) & 0xff ) );
break;
case 2:
b10 = ( _getbyte64( s, i ) << 18) | ( _getbyte64( s, i + 1 ) << 12 );
x.push( String.fromCharCode( b10 >> 16 ) );
break;
}
return x.join( "" );
}
function _getbyte( s, i ) {
var x = s.charCodeAt( i );
if ( x > 255 ) {
throw "INVALID_CHARACTER_ERR: DOM Exception 5";
}
return x;
}
function _encode( s ) {
if ( arguments.length !== 1 ) {
throw "SyntaxError: exactly one argument required";
}
s = String( s );
var i,
b10,
x = [],
imax = s.length - s.length % 3;
if ( s.length === 0 ) {
return s;
}
for ( i = 0; i < imax; i += 3 ) {
b10 = ( _getbyte( s, i ) << 16 ) | ( _getbyte( s, i + 1 ) << 8 ) | _getbyte( s, i + 2 );
x.push( _ALPHA.charAt( b10 >> 18 ) );
x.push( _ALPHA.charAt( ( b10 >> 12 ) & 0x3F ) );
x.push( _ALPHA.charAt( ( b10 >> 6 ) & 0x3f ) );
x.push( _ALPHA.charAt( b10 & 0x3f ) );
}
switch ( s.length - imax ) {
case 1:
b10 = _getbyte( s, i ) << 16;
x.push( _ALPHA.charAt( b10 >> 18 ) + _ALPHA.charAt( ( b10 >> 12 ) & 0x3F ) + _PADCHAR + _PADCHAR );
break;
case 2:
b10 = ( _getbyte( s, i ) << 16 ) | ( _getbyte( s, i + 1 ) << 8 );
x.push( _ALPHA.charAt( b10 >> 18 ) + _ALPHA.charAt( ( b10 >> 12 ) & 0x3F ) + _ALPHA.charAt( ( b10 >> 6 ) & 0x3f ) + _PADCHAR );
break;
}
return x.join( "" );
}
return {
decode: _decode,
encode: _encode,
VERSION: _VERSION
};
}( jQuery ) );
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