utf-8编码转换成编码转换成gb2312
[code]<script>
function chinesefromutf8url(strutf8)
{
var bstr = “”;
var noffset = 0;
// processing point on strutf8
if( strutf8 == “” )
return “”;
strutf8 = strutf8.tolowercase();
noffset = strutf8.indexof(“%e”);
if( noffset == -1 )
return strutf8;
while( noffset != -1 )
{
bstr += strutf8.substr(0, noffset);
strutf8 = strutf8.substr(noffset, strutf8.length – noffset);
if( strutf8 == “” ¦ ¦ strutf8.length < 9 ) // bad string
return bstr;
bstr += utf8codetochinesechar(strutf8.substr(0, 9));
strutf8 = strutf8.substr(9, strutf8.length – 9);
noffset = strutf8.indexof(“%e”);
}
return bstr + strutf8;
}
function unicodefromutf8(strutf8)
{
var bstr = “”;
var ntotalchars = strutf8.length; // total chars to be processed.
var noffset = 0; // processing point on strutf8
var nremainingbytes = ntotalchars; // how many bytes left to be converted
var noutputposition = 0;
var icode, icode1, icode2; // the value of the unicode.
while (noffset < ntotalchars)
{
icode = strutf8.charcodeat(noffset);
if ((icode & 0x80) == 0) // 1 byte.
{
if ( nremainingbytes < 1 ) // not enough data
break;
bstr += string.fromcharcode(icode & 0x7f);
noffset ++;
nremainingbytes -= 1;
}
else if ((icode & 0xe0) == 0xc0) // 2 bytes
{
icode1 = strutf8.charcodeat(noffset + 1);
if ( nremainingbytes < 2 ¦ ¦ // not enough data
(icode1 & 0xc0) != 0x80 ) // invalid pattern
{
break;
}
bstr += string.fromcharcode(((icode & 0x3f) << 6) ¦ ( icode1 & 0x3f));
noffset += 2;
nremainingbytes -= 2;
}
else if ((icode & 0xf0) == 0xe0) // 3 bytes
{
icode1 = strutf8.charcodeat(noffset + 1);
icode2 = strutf8.charcodeat(noffset + 2);
if ( nremainingbytes < 3 ¦ ¦ // not enough data
(icode1 & 0xc0) != 0x80 ¦ ¦ // invalid pattern
(icode2 & 0xc0) != 0x80 )
{
break;
}
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