flvdemo/flv/jquery.base64.js

/*!
 * jquery.base64.js 0.1 - https://github.com/yckart/jquery.base64.js
 * Makes Base64 en & -decoding simpler as it is.
 *
 * Based upon: https://gist.github.com/Yaffle/1284012
 *
 * Copyright (c) 2012 Yannick Albert (http://yckart.com)
 * Licensed under the MIT license (http://www.opensource.org/licenses/mit-license.php).
 * 2013/02/10
 **/
(function ($) {
  var b64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/",
    a256 = "",
    r64 = [256],
    r256 = [256],
    i = 0;

  var UTF8 = {
    /**
     * Encode multi-byte Unicode string into utf-8 multiple single-byte characters
     * (BMP / basic multilingual plane only)
     *
     * Chars in range U+0080 - U+07FF are encoded in 2 chars, U+0800 - U+FFFF in 3 chars
     *
     * @param {String} strUni Unicode string to be encoded as UTF-8
     * @returns {String} encoded string
     */
    encode: function (strUni) {
      // use regular expressions & String.replace callback function for better efficiency
      // than procedural approaches
      var strUtf = strUni
        .replace(
          /[\u0080-\u07ff]/g, // U+0080 - U+07FF => 2 bytes 110yyyyy, 10zzzzzz
          function (c) {
            var cc = c.charCodeAt(0);
            return String.fromCharCode(0xc0 | (cc >> 6), 0x80 | (cc & 0x3f));
          }
        )
        .replace(
          /[\u0800-\uffff]/g, // U+0800 - U+FFFF => 3 bytes 1110xxxx, 10yyyyyy, 10zzzzzz
          function (c) {
            var cc = c.charCodeAt(0);
            return String.fromCharCode(
              0xe0 | (cc >> 12),
              0x80 | ((cc >> 6) & 0x3f),
              0x80 | (cc & 0x3f)
            );
          }
        );
      return strUtf;
    },

    /**
     * Decode utf-8 encoded string back into multi-byte Unicode characters
     *
     * @param {String} strUtf UTF-8 string to be decoded back to Unicode
     * @returns {String} decoded string
     */
    decode: function (strUtf) {
      // note: decode 3-byte chars first as decoded 2-byte strings could appear to be 3-byte char!
      var strUni = strUtf
        .replace(
          /[\u00e0-\u00ef][\u0080-\u00bf][\u0080-\u00bf]/g, // 3-byte chars
          function (c) {
            // (note parentheses for precence)
            var cc =
              ((c.charCodeAt(0) & 0x0f) << 12) |
              ((c.charCodeAt(1) & 0x3f) << 6) |
              (c.charCodeAt(2) & 0x3f);
            return String.fromCharCode(cc);
          }
        )
        .replace(
          /[\u00c0-\u00df][\u0080-\u00bf]/g, // 2-byte chars
          function (c) {
            // (note parentheses for precence)
            var cc = ((c.charCodeAt(0) & 0x1f) << 6) | (c.charCodeAt(1) & 0x3f);
            return String.fromCharCode(cc);
          }
        );
      return strUni;
    },
  };

  while (i < 256) {
    var c = String.fromCharCode(i);
    a256 += c;
    r256[i] = i;
    r64[i] = b64.indexOf(c);
    ++i;
  }

  function code(s, discard, alpha, beta, w1, w2) {
    s = String(s);
    var buffer = 0,
      i = 0,
      length = s.length,
      result = "",
      bitsInBuffer = 0;

    while (i < length) {
      var c = s.charCodeAt(i);
      c = c < 256 ? alpha[c] : -1;

      buffer = (buffer << w1) + c;
      bitsInBuffer += w1;

      while (bitsInBuffer >= w2) {
        bitsInBuffer -= w2;
        var tmp = buffer >> bitsInBuffer;
        result += beta.charAt(tmp);
        buffer ^= tmp << bitsInBuffer;
      }
      ++i;
    }
    if (!discard && bitsInBuffer > 0)
      result += beta.charAt(buffer << (w2 - bitsInBuffer));
    return result;
  }

  var Plugin = ($.base64 = function (dir, input, encode) {
    return input ? Plugin[dir](input, encode) : dir ? null : this;
  });

  Plugin.btoa = Plugin.encode = function (plain, utf8encode) {
    plain =
      Plugin.raw === false || Plugin.utf8encode || utf8encode
        ? UTF8.encode(plain)
        : plain;
    plain = code(plain, false, r256, b64, 8, 6);
    return plain + "====".slice(plain.length % 4 || 4);
  };

  Plugin.atob = Plugin.decode = function (coded, utf8decode) {
    coded = String(coded).split("=");
    var i = coded.length;
    do {
      --i;
      coded[i] = code(coded[i], true, r64, a256, 6, 8);
    } while (i > 0);
    coded = coded.join("");
    return Plugin.raw === false || Plugin.utf8decode || utf8decode
      ? UTF8.decode(coded)
      : coded;
  };
})(jQuery);