Convert an array of big-endian words to a base-64 string - Node.js String

Node.js examples for String:Big endian

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Description

Convert an array of big-endian words to a base-64 string

Demo Code


// Convert an array of big-endian words to a base-64 string
  function binb2b64(binarray) {
    var tab = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
    var str = "";
    for (var i = 0; i < binarray.length * 4; i += 3) {
      var triplet = (((binarray[i >> 2] >> 8 * (3 - i % 4)) & 0xFF) << 16)
        | (((binarray[i + 1 >> 2] >> 8 * (3 - (i + 1) % 4)) & 0xFF) << 8 )
        | ((binarray[i + 2 >> 2] >> 8 * (3 - (i + 2) % 4)) & 0xFF);
      for (var j = 0; j < 4; j++) {
        if (i * 8 + j * 6 > binarray.length * 32) str += b64pad;
        else str += tab.charAt((triplet >> 6 * (3 - j)) & 0x3F);
      }/*  w ww .ja v a 2  s .co m*/
    }
    return str;
  }

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