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iotaweb/gist:8228253

Created January 2, 2014 22:25
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Revisions

  1. iotaweb created this gist Jan 2, 2014.
    145 changes: 145 additions & 0 deletions gistfile1.txt
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,145 @@
    /**
    *
    * Base64 encode / decode
    * http://www.webtoolkit.info/
    *
    **/
    .factory('Base64', function() {

    // private property
    var _keyStr = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=';

    // private method for UTF-8 encoding
    var _utf8_encode = function(string) {
    string = string.replace(/\r\n/g, '\n');
    var utftext = '';

    for (var n = 0; n < string.length; n += 1) {

    var c = string.charCodeAt(n);

    if (c < 128) {
    utftext += String.fromCharCode(c);
    } else if ((c > 127) && (c < 2048)) {
    utftext += String.fromCharCode((c >> 6) | 192);
    utftext += String.fromCharCode((c & 63) | 128);
    } else {
    utftext += String.fromCharCode((c >> 12) | 224);
    utftext += String.fromCharCode(((c >> 6) & 63) | 128);
    utftext += String.fromCharCode((c & 63) | 128);
    }

    }

    return utftext;
    };

    // private method for UTF-8 decoding
    var _utf8_decode = function(utftext) {
    var string = '';
    var i = 0;
    var c = 0;
    var c1 = 0;
    var c2 = 0;
    var c3;

    while (i < utftext.length) {

    c = utftext.charCodeAt(i);

    if (c < 128) {
    string += String.fromCharCode(c);
    i += 1;
    } else if ((c > 191) && (c < 224)) {
    c2 = utftext.charCodeAt(i + 1);
    string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
    i += 2;
    } else {
    c2 = utftext.charCodeAt(i + 1);
    c3 = utftext.charCodeAt(i + 2);
    string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
    i += 3;
    }

    }

    return string;
    };

    return {
    // public method for encoding
    encode: function(input) {
    var output = '';
    var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
    var i = 0;

    input = _utf8_encode(input);

    while (i < input.length) {

    chr1 = input.charCodeAt(i += 1);
    chr2 = input.charCodeAt(i += 1);
    chr3 = input.charCodeAt(i += 1);

    enc1 = chr1 >> 2;
    enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
    enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
    enc4 = chr3 & 63;

    if (isNaN(chr2)) {
    enc3 = enc4 = 64;
    } else if (isNaN(chr3)) {
    enc4 = 64;
    }

    output = output +
    _keyStr.charAt(enc1) + _keyStr.charAt(enc2) +
    _keyStr.charAt(enc3) + _keyStr.charAt(enc4);

    }

    return output;
    },

    // public method for decoding
    decode: function(input) {
    var output = '';
    var chr1, chr2, chr3;
    var enc1, enc2, enc3, enc4;
    var i = 0;

    input = input.replace(/[^A-Za-z0-9\+\/\=]/g, '');

    while (i < input.length) {

    /* jshint ignore:start */

    enc1 = _keyStr.indexOf(input.charAt(i++));
    enc2 = _keyStr.indexOf(input.charAt(i++));
    enc3 = _keyStr.indexOf(input.charAt(i++));
    enc4 = _keyStr.indexOf(input.charAt(i++));

    /* jshint ignore:end */

    chr1 = (enc1 << 2) | (enc2 >> 4);
    chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
    chr3 = ((enc3 & 3) << 6) | enc4;

    output = output + String.fromCharCode(chr1);


    if (enc3 !== 64) {
    output = output + String.fromCharCode(chr2);
    }
    if (enc4 !== 64) {
    output = output + String.fromCharCode(chr3);
    }

    }

    output = _utf8_decode(output);

    return output;
    }
    };
    })