/*
 *
 *  This  file  is part of  the digital testament   management program
 *                           DigiProof.
 *
 *  By  accessing  this  software,  DigiProof, you are  duly  informed
 *  of and agree to be bound by the conditions described below in this
 *  notice:
 *
 *  This software product,  DigiProof,  is  developed by T. Linden and
 *  copyrighted  (C)  2013  by  T. Linden,   with all rights reserved.
 *
 *  There is no charge for  DigiProof software.  You can  redistribute
 *  it  and/or modify  it  under the terms  of the GNU  General Public
 *  License, which is incorporated by reference herein.
 *
 *  DigiProof is distributed WITHOUT ANY WARRANTY, IMPLIED OR EXPRESS,
 *  OF MERCHANTABILITY  OR FITNESS  FOR A  PARTICULAR PURPOSE  or that
 *  the use of it will not infringe on any third party's  intellectual
 *  property rights.
 *
 *  You should  have received a copy of the GNU General Public License
 *  along with DigiProof. Copies can also be obtained from:
 *
 *    http://www.gnu.org/licenses/gpl-2.0.html
 *
 *  or by writing to:
 *
 *    Free Software Foundation, Inc.
 *    Inc., 51 Franklin Street, Fifth Floor
 *    Boston, MA 02110-1301
 *    USA
 *
 *  Or contact:
 *
 *    "T. Linden" <tlinden@cpan.org>
 *
 *  The sourcecode can be found on:
 *
 *    https://codeberg.org/scip/digiproof
 *
 */


// tell if there have been anything done yet
function CheckForEmptyDB() {
    var assets = App.Asset.find();
    var notempty = true;
    notempty = assets.forEach(function(asset) {
        return false;
    });
    return notempty;
}


// Convert hex string to ASCII.
// See http://stackoverflow.com/questions/11889329/word-array-to-string
function hex2a(hex) {
    var str = '';
    for (var i = 0; i < hex.length; i += 2)
        str += String.fromCharCode(parseInt(hex.substr(i, 2), 16));
    return str;
}

// decrypt data
function decryptimport(hash, data) {
    var clear = CryptoJS.AES.decrypt(data, hash);
    return unescape(hex2a(clear.toString()));
}



// from:
// http://ntt.cc/2008/01/19/base64-encoder-decoder-with-javascript.html
function decode64(input) {
    var output = "";
    var chr1, chr2, chr3 = "";
    var enc1, enc2, enc3, enc4 = "";
    var i = 0;

    var keyStr = "ABCDEFGHIJKLMNOP" +
        "QRSTUVWXYZabcdef" +
        "ghijklmnopqrstuv" +
        "wxyz0123456789+/" +
        "=";

    // remove all characters that are not A-Z, a-z, 0-9, +, /, or =
    var base64test = /[^A-Za-z0-9\+\/\=]/g; //
    if (base64test.exec(input)) {
        alert("There were invalid base64 characters in the input text.\n" +
              "Valid base64 characters are A-Z, a-z, 0-9, '+', '/',and '='\n" +
              "Expect errors in decoding.");
    }
    input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");

    do {
        enc1 = keyStr.indexOf(input.charAt(i++));
        enc2 = keyStr.indexOf(input.charAt(i++));
        enc3 = keyStr.indexOf(input.charAt(i++));
        enc4 = keyStr.indexOf(input.charAt(i++));
	
        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);
        }

        chr1 = chr2 = chr3 = "";
        enc1 = enc2 = enc3 = enc4 = "";
	
    } while (i < input.length);
    
    return unescape(output);
}