php实现的一个UTF8编码转Unicode的函数

function Utf8ToUnicode(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 {
iCode = strUtf8.charCodeAt(nOffset);
if ((iCode & 0×80) == 0) // 1 byte.
{
if ( nRemainingBytes break;
bstr += String.fromCharCode(iCode & 0×7F);
nOffset ++;
nRemainingBytes -= 1;
}
else if ((iCode & 0xE0) == 0xC0) // 2 bytes
{
iCode1 = strUtf8.charCodeAt(nOffset + 1);
if ( nRemainingBytes (iCode1 & 0xC0) != 0×80 ) // invalid pattern
{
break;
}
bstr += String.fromCharCode(((iCode & 0×3F) nOffset += 2;
nRemainingBytes -= 2;
}
else if ((iCode & 0xF0) == 0xE0) // 3 bytes
{
iCode1 = strUtf8.charCodeAt(nOffset + 1);
iCode2 = strUtf8.charCodeAt(nOffset + 2);
if ( nRemainingBytes (iCode1 & 0xC0) != 0×80 || // invalid pattern
(iCode2 & 0xC0) != 0×80 )
{
break;
}
bstr += String.fromCharCode(((iCode & 0×0F) ((iCode1 & 0×3F) (iCode2 & 0×3F));
nOffset += 3;
nRemainingBytes -= 3;
}
else // 4 or more bytes — unsupported
break;
}
if (nRemainingBytes != 0)
{
// bad UTF8 string.
return “”;
}
return bstr;
}
?>