📄 base64.htm

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<html>

<head>
<meta http-equiv="Content-Language" content="en-us">
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<meta name="GENERATOR" content="Microsoft FrontPage 4.0">
<meta name="ProgId" content="FrontPage.Editor.Document">
<title>BASE64编码加密</title>

<STYLE type=text/css>
BODY {
	MARGIN-TOP: 8px
}
.style1 {
	COLOR: #ff6633
}
TD {
	FONT-SIZE: 9pt; LINE-HEIGHT: 15pt
}
A:link {
	COLOR: #333333; TEXT-DECORATION: none
}
A:visited {
	COLOR: #333333; TEXT-DECORATION: none
}
A:active {
	COLOR: #ff6600; TEXT-DECORATION: none
}
A:hover {
	COLOR: #ff6600
}
.upline {
	BORDER-TOP: #ff6633 1px solid
}
.downline {
	BORDER-BOTTOM: #ff6633 1px solid
}
.f1 {
	FONT-SIZE: 12px; COLOR: #ff6633; FONT-FAMILY: "Verdana", "Arial", "Helvetica", "sans-serif"; TEXT-DECORATION: none
}
.f2 {
	FONT-SIZE: 12px; COLOR: #333333; FONT-FAMILY: "Verdana", "Arial", "Helvetica", "sans-serif"; TEXT-DECORATION: none
}
</STYLE>


</head>

<body>

<div align="center">
  <center>
  <table border="0" cellpadding="0" cellspacing="0" width="760">
    <tr>
    </tr>
    <tr>
      <td width="100%">
            <table border="0" cellpadding="0" cellspacing="0" style="border-collapse: collapse" bordercolor="#111111" width="100%" id="AutoNumber7">
              <tr>
                <td width="100%">
                <table width="100%" border="0" align="center" cellpadding="0" cellspacing="0" bordercolor="#111111" id="AutoNumber8" style="border-collapse: collapse">
                  <tr>
                    <td width="103%" align="left" height="30">
                      <p align="center"><font face="宋体"><b>BASE64编码加密</b></font></td>
                  </tr>
                  <tr>
                    <td width="103%" align="left">

<script language=javascript>
var base64EncodeChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
var base64DecodeChars = new Array(
    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63,
    52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1,
    -1,  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14,
    15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1,
    -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
    41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1);

function base64encode(str) {
    var out, i, len;
    var c1, c2, c3;

    len = str.length;
    i = 0;
    out = "";
    while(i < len) {
    c1 = str.charCodeAt(i++) & 0xff;
    if(i == len)
    {
        out += base64EncodeChars.charAt(c1 >> 2);
        out += base64EncodeChars.charAt((c1 & 0x3) << 4);
        out += "==";
        break;
    }
    c2 = str.charCodeAt(i++);
    if(i == len)
    {
        out += base64EncodeChars.charAt(c1 >> 2);
        out += base64EncodeChars.charAt(((c1 & 0x3)<< 4) | ((c2 & 0xF0) >> 4));
        out += base64EncodeChars.charAt((c2 & 0xF) << 2);
        out += "=";
        break;
    }
    c3 = str.charCodeAt(i++);
    out += base64EncodeChars.charAt(c1 >> 2);
    out += base64EncodeChars.charAt(((c1 & 0x3)<< 4) | ((c2 & 0xF0) >> 4));
    out += base64EncodeChars.charAt(((c2 & 0xF) << 2) | ((c3 & 0xC0) >>6));
    out += base64EncodeChars.charAt(c3 & 0x3F);
    }
    return out;
}

function base64decode(str) {
    var c1, c2, c3, c4;
    var i, len, out;

    len = str.length;
    i = 0;
    out = "";
    while(i < len) {
    /* c1 */
    do {
        c1 = base64DecodeChars[str.charCodeAt(i++) & 0xff];
    } while(i < len && c1 == -1);
    if(c1 == -1)
        break;

    /* c2 */
    do {
        c2 = base64DecodeChars[str.charCodeAt(i++) & 0xff];
    } while(i < len && c2 == -1);
    if(c2 == -1)
        break;

    out += String.fromCharCode((c1 << 2) | ((c2 & 0x30) >> 4));

    /* c3 */
    do {
        c3 = str.charCodeAt(i++) & 0xff;
        if(c3 == 61)
        return out;
        c3 = base64DecodeChars[c3];
    } while(i < len && c3 == -1);
    if(c3 == -1)
        break;

    out += String.fromCharCode(((c2 & 0XF) << 4) | ((c3 & 0x3C) >> 2));

    /* c4 */
    do {
        c4 = str.charCodeAt(i++) & 0xff;
        if(c4 == 61)
        return out;
        c4 = base64DecodeChars[c4];
    } while(i < len && c4 == -1);
    if(c4 == -1)
        break;
    out += String.fromCharCode(((c3 & 0x03) << 6) | c4);
    }
    return out;
}

function utf16to8(str) {
    var out, i, len, c;

    out = "";
    len = str.length;
    for(i = 0; i < len; i++) {
    c = str.charCodeAt(i);
    if ((c >= 0x0001) && (c <= 0x007F)) {
        out += str.charAt(i);
    } else if (c > 0x07FF) {
        out += String.fromCharCode(0xE0 | ((c >> 12) & 0x0F));
        out += String.fromCharCode(0x80 | ((c >>  6) & 0x3F));
        out += String.fromCharCode(0x80 | ((c >>  0) & 0x3F));
    } else {
        out += String.fromCharCode(0xC0 | ((c >>  6) & 0x1F));
        out += String.fromCharCode(0x80 | ((c >>  0) & 0x3F));
    }
    }
    return out;
}

function utf8to16(str) {
    var out, i, len, c;
    var char2, char3;

    out = "";
    len = str.length;
    i = 0;
    while(i < len) {
    c = str.charCodeAt(i++);
    switch(c >> 4)
    { 
      case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7:
        // 0xxxxxxx
        out += str.charAt(i-1);
        break;
      case 12: case 13:
        // 110x xxxx   10xx xxxx
        char2 = str.charCodeAt(i++);
        out += String.fromCharCode(((c & 0x1F) << 6) | (char2 & 0x3F));
        break;
      case 14:
        // 1110 xxxx  10xx xxxx  10xx xxxx
        char2 = str.charCodeAt(i++);
        char3 = str.charCodeAt(i++);
        out += String.fromCharCode(((c & 0x0F) << 12) |
                       ((char2 & 0x3F) << 6) |
                       ((char3 & 0x3F) << 0));
        break;
    }
    }

    return out;
}


function doit() {
    var f = document.f
    f.output.value = base64encode(utf16to8(f.source.value))
    f.decode.value = utf8to16(base64decode(f.output.value))
}
</script>
  </center>
<FORM NAME="f">
<p align="left">
原码<BR>
<TEXTAREA NAME="source" ROWS=4 COLS=104 WRAP="soft"></TEXTAREA><BR><BR>
Base64 encode<BR>           
<TEXTAREA NAME="output" ROWS=4 COLS=104 WRAP="soft"></TEXTAREA><BR><BR>
Base64 decode<BR>           
<TEXTAREA NAME="decode" ROWS=4 COLS=104 WRAP="soft"></TEXTAREA><BR><BR>
<INPUT TYPE=BUTTON VALUE="转换" ONCLICK="doit()">
</FORM>        </td>
                  </tr>
  <center>
                  <tr>
                    <td width="103%" align="left">
                      　</td>
                  </tr>
                </TABLE>
                </td>
              </tr>
            </table>
      </td>
    </tr>
    <tr>
    </tr>
  </table>
<br>
<br>
<p align=center><script language="javascript" type="text/javascript" src="../js/end.js"></script></p>
<p align=center><script language="javascript" type="text/javascript" src="../js/tongji.js"></script>
</div>

</body>

</html>
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