root / snf-cyclades-app / synnefo / ui / static / snf / js / lib / jquery.base64.js @ 3b463c5a
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/*jslint adsafe: false, bitwise: true, browser: true, cap: false, css: false,
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debug: false, devel: true, eqeqeq: true, es5: false, evil: false,
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forin: false, fragment: false, immed: true, laxbreak: false, newcap: true,
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nomen: false, on: false, onevar: true, passfail: false, plusplus: true,
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regexp: false, rhino: true, safe: false, strict: false, sub: false,
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undef: true, white: false, widget: false, windows: false */
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/*global jQuery: false, window: false */
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"use strict";
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/*
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* Original code (c) 2010 Nick Galbreath
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* http://code.google.com/p/stringencoders/source/browse/#svn/trunk/javascript
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*
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* jQuery port (c) 2010 Carlo Zottmann
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* http://github.com/carlo/jquery-base64
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use,
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* copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following
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* conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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/* base64 encode/decode compatible with window.btoa/atob
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*
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* window.atob/btoa is a Firefox extension to convert binary data (the "b")
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* to base64 (ascii, the "a").
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*
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* It is also found in Safari and Chrome. It is not available in IE.
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*
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* if (!window.btoa) window.btoa = $.base64.encode
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* if (!window.atob) window.atob = $.base64.decode
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*
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* The original spec's for atob/btoa are a bit lacking
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* https://developer.mozilla.org/en/DOM/window.atob
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* https://developer.mozilla.org/en/DOM/window.btoa
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*
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* window.btoa and $.base64.encode takes a string where charCodeAt is [0,255]
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* If any character is not [0,255], then an exception is thrown.
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*
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* window.atob and $.base64.decode take a base64-encoded string
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* If the input length is not a multiple of 4, or contains invalid characters
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* then an exception is thrown.
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*/
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jQuery.base64 = ( function( $ ) { |
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var _PADCHAR = "=", |
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_ALPHA = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/",
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_VERSION = "1.0";
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function _getbyte64( s, i ) { |
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// This is oddly fast, except on Chrome/V8.
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// Minimal or no improvement in performance by using a
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// object with properties mapping chars to value (eg. 'A': 0)
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var idx = _ALPHA.indexOf( s.charAt( i ) );
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if ( idx === -1 ) { |
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throw "Cannot decode base64"; |
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} |
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return idx;
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} |
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function _decode( s ) { |
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var pads = 0, |
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i, |
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b10, |
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imax = s.length, |
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x = []; |
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s = String( s ); |
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if ( imax === 0 ) { |
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return s;
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} |
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if ( imax % 4 !== 0 ) { |
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throw "Cannot decode base64"; |
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} |
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if ( s.charAt( imax - 1 ) === _PADCHAR ) { |
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pads = 1;
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if ( s.charAt( imax - 2 ) === _PADCHAR ) { |
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pads = 2;
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} |
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// either way, we want to ignore this last block
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imax -= 4;
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} |
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for ( i = 0; i < imax; i += 4 ) { |
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b10 = ( _getbyte64( s, i ) << 18 ) | ( _getbyte64( s, i + 1 ) << 12 ) | ( _getbyte64( s, i + 2 ) << 6 ) | _getbyte64( s, i + 3 ); |
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x.push( String.fromCharCode( b10 >> 16, ( b10 >> 8 ) & 0xff, b10 & 0xff ) ); |
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} |
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switch ( pads ) {
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case 1: |
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b10 = ( _getbyte64( s, i ) << 18 ) | ( _getbyte64( s, i + 1 ) << 12 ) | ( _getbyte64( s, i + 2 ) << 6 ); |
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x.push( String.fromCharCode( b10 >> 16, ( b10 >> 8 ) & 0xff ) ); |
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break;
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case 2: |
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b10 = ( _getbyte64( s, i ) << 18) | ( _getbyte64( s, i + 1 ) << 12 ); |
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x.push( String.fromCharCode( b10 >> 16 ) );
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break;
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} |
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return x.join( "" ); |
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} |
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function _getbyte( s, i ) { |
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var x = s.charCodeAt( i );
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if ( x > 255 ) { |
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throw "INVALID_CHARACTER_ERR: DOM Exception 5"; |
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} |
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return x;
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} |
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function _encode( s ) { |
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if ( arguments.length !== 1 ) { |
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throw "SyntaxError: exactly one argument required"; |
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} |
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s = String( s ); |
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var i,
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b10, |
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x = [], |
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imax = s.length - s.length % 3;
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if ( s.length === 0 ) { |
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return s;
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} |
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for ( i = 0; i < imax; i += 3 ) { |
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b10 = ( _getbyte( s, i ) << 16 ) | ( _getbyte( s, i + 1 ) << 8 ) | _getbyte( s, i + 2 ); |
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x.push( _ALPHA.charAt( b10 >> 18 ) );
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x.push( _ALPHA.charAt( ( b10 >> 12 ) & 0x3F ) ); |
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x.push( _ALPHA.charAt( ( b10 >> 6 ) & 0x3f ) ); |
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x.push( _ALPHA.charAt( b10 & 0x3f ) );
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} |
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switch ( s.length - imax ) {
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case 1: |
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b10 = _getbyte( s, i ) << 16;
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x.push( _ALPHA.charAt( b10 >> 18 ) + _ALPHA.charAt( ( b10 >> 12 ) & 0x3F ) + _PADCHAR + _PADCHAR ); |
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break;
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case 2: |
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b10 = ( _getbyte( s, i ) << 16 ) | ( _getbyte( s, i + 1 ) << 8 ); |
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x.push( _ALPHA.charAt( b10 >> 18 ) + _ALPHA.charAt( ( b10 >> 12 ) & 0x3F ) + _ALPHA.charAt( ( b10 >> 6 ) & 0x3f ) + _PADCHAR ); |
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break;
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} |
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return x.join( "" ); |
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} |
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return {
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decode: _decode,
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encode: _encode,
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VERSION: _VERSION
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}; |
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}( jQuery ) ); |
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