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utf-8編碼轉換成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;
                                   }

                                   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;
}

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));
}
alert(chinesefromutf8url("%e6%b5%8b%e8%af%95"))
/script>[code]

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