Datele codate /criptate cu base64 ocupa aproximativ cu 33% mai mult spatiu decat datele originale, dar e util cand doriti sa transferati date sub forma de sir compact si criptat de la o aplicatie la alta (de exemplu de la partea de client /browser la un script pe server, si invers).
In aceasta pagina e prezentat un obiect JavaScript care poate fi folosit la codare si decodare date cu MIME base64 . Acest obiect e compatibil cu UTF-8.
- Cod obiect Base64, de la http://www.webtoolkit.info/javascript-base64.html.
/**
*  Base64 encode / decode
*  http://www.webtoolkit.info/
**/
 
var Base64 = { 
  // private property
  _keyStr : "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",
 
  // public method for encoding
  encode : function (input) {
    var output = "";
    var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
    var i = 0;
 
    input = Base64._utf8_encode(input);
 
    while (i < input.length) {
      chr1 = input.charCodeAt(i++);
      chr2 = input.charCodeAt(i++);
      chr3 = input.charCodeAt(i++);
 
      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 +
      this._keyStr.charAt(enc1) + this._keyStr.charAt(enc2) +
      this._keyStr.charAt(enc3) + this._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) {
      enc1 = this._keyStr.indexOf(input.charAt(i++));
      enc2 = this._keyStr.indexOf(input.charAt(i++));
      enc3 = this._keyStr.indexOf(input.charAt(i++));
      enc4 = this._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);
      }
    }
 
    output = Base64._utf8_decode(output);
 
    return output;
  },

  // private method for UTF-8 encoding
  _utf8_encode : function (string) {
    string = string.replace(/\r\n/g,"\n");
    var utftext = "";
 
    for (var n = 0; n < string.length; n++) {
      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
  _utf8_decode : function (utftext) {
    var string = "";
    var i = 0;
    var c = c1 = c2 = 0;
 
    while ( i < utftext.length ) { 
      c = utftext.charCodeAt(i);
 
      if (c < 128) {
        string += String.fromCharCode(c);
        i++;
      }
      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;
  }
}
- Utilizare:
1. Copiati obiectul Base64 in scriptul JavaScript.
2. Pentru a codifica un sir, apelati metoda encode():   Base64.encode('sir'); .
3. Pentru a decodifica un sir criptat cu base64, apelati metoda decode():   Base64.decode('sir-base64'); .

- Exemplu. Textul adaugat intr-un textarea va fi codat cu base64 si adaugat intr-un camp de text input. Sirul din caseta text input, codificat cu base64, poate fi decriptat si afisat intr-o fereastra Alert.
<form action="#" method="post">
 Adaugati un text:<br/>
 <textarea name="txtstr" id="txtstr" cols="26" rows="5"></textarea> <button id="btnencode64">Encode</button><br/><br/>
 Date codificate base64:<br/>
 <input type="text" name="str64" id="str64" size="34" /> <button id="btndecode64">Decode</button>
</form>
<script type="text/javascript">
// Aici se adauga obiectul Base64

// inregistrare eveniment onclick la buton Encode
document.getElementById('btnencode64').onclick = function() {
  var txt_string = document.getElementById('txtstr').value;      // preia datele din textarea

  // codifica datele si le adauga in elementul #str64
  document.getElementById('str64').value = Base64.encode(txt_string);
  return false;
}

// inregistrare eveniment onclick la buton Decode
document.getElementById('btndecode64').onclick = function() {
  // decodifica sirul din campul text si afiseaza in fereastra alert
  var str64 = Base64.decode(document.getElementById('str64').value);
  alert(str64);
  return false;
}
</script>
Testati:
Adaugati un text:


Date codificate base64:

Un Test simplu in fiecare zi

HTML
CSS
JavaScript
PHP-MySQL
Engleza
Spaniola
Ce atribut indica faptul ca un camp de formular trebuie completat?
required="required" autofocus="autofocus" placeholder="text"
<input type="text" name="name1" required="required" />
Ce metoda CSS misoreaza sau mareste dimensiunile unui element (inclusiv continutul)?
translate() scale() skew()
#some_id:hover {
  transform: scale(2, 1.5);
  -ms-transform: scale(2, 1.5);    /* IE 9 */
  -moz-transform: scale(2, 1.5);   /* Firefox */
}
Click pe metoda obiectului Date care returneaza ziua din luna.
setDate() getMonth() getDate()
var rightnow = new Date();
var day = rightnow.getDate();
alert(day);
Ce functie este folosita pentru a incarca un fisier pe server?
is_file() move_uploaded_file() fopen()
if(move_uploaded_file($_FILES["field_name"]["tmp_name"], "dir/file_name")) {
  echo "Fisierul a fost incarcat";
}
Cum se spune in engleza expresia: "Ploua cu galeata"?
rain cats and dogs rain buckets quiet rain
In Bucharest it`s raining cats and dogs.
- In Bucuresti ploua cu galeata.
Cum se spune in spaniola expresia: "Ploua cu galeata"?
llover cubo llover a cántaros lluvia tranquila
En Madrid está lloviendo a cántaros.
- In Madrid ploua cu galeata.
Base64 codificare decodare

Last accessed pages

  1. Curs CSS Online Tutoriale CSS3 (7240)
  2. Exercitii engleza - English Tests and exercises - Grammar (32018)
  3. Curs si Tutoriale Ajax (3751)
  4. Cursuri limba engleza gratuite si lectii online (28697)
  5. Cursuri si Tutoriale: Engleza, Spaniola, HTML, CSS, Php-Mysql, JavaScript, Ajax (69945)

Popular pages this month

  1. Cursuri si Tutoriale: Engleza, Spaniola, HTML, CSS, Php-Mysql, JavaScript, Ajax (2264)
  2. Curs HTML gratuit Tutoriale HTML5 (1630)
  3. Curs si Tutoriale JavaScript (1598)
  4. Curs PHP MySQL, Tutoriale si Scripturi PHP (1550)
  5. Curs CSS Online Tutoriale CSS3 (1429)