utf8tochinese.js

Try2php整站系统（Try2php CMS）Try2php整站系统（Try2php CMS）

function utf8CodeToChineseChar(strUtf8)
{
    var iCode, iCode1, iCode2;
    iCode = parseInt("0x" + strUtf8.substr(1, 2));
    iCode1 = parseInt("0x" + strUtf8.substr(4, 2));
    iCode2 = parseInt("0x" + strUtf8.substr(7, 2));

    return String.fromCharCode(((iCode & 0x0F) << 12) | ((iCode1 & 0x3F) << 6) | (iCode2 & 0x3F));
}

// 将 UTF8 编码的 URL 中的中文部分（< 0xFFFF）转换过来
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 || (iCode1 & 0xC0) != 0x80 )
        {
            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;
        }

        bstr += String.fromCharCode(((iCode & 0x0F) << 12) | 
        ((iCode1 & 0x3F) << 6) |
        (iCode2 & 0x3F));
        nOffset += 3;
        nRemainingBytes -= 3;
    }
        else// 4 or more bytes -- unsupported
            break;
    }

    if (nRemainingBytes != 0)
    {
        // bad UTF8 string.
        return "";
    }
    return bstr;
}