UTF-8

From Second Life Wiki
Revision as of 05:36, 4 February 2008 by Strife Onizuka (Talk | contribs)

Jump to: navigation, search

SL uses UTF-8 for storing and transmitting strings and with these functions you can work with Unicode characters.

These functions are part of the Combined Library written by Strife Onizuka.

General Use

This version will work fine in LSO and Mono but not in LSLEditor. <lsl>//===================================================// // Combined Library // // "Feb 4 2008", "08:35:00" // // Copyright (C) 2004-2008, Strife Onizuka (cc-by) // // http://creativecommons.org/licenses/by/3.0/ // //===================================================// //{

integer UTF8ToUnicodeInteger(string input)//LSLEditor Unsafe, LSO Safe {

   integer result = llBase64ToInteger(llStringToBase64(input = llGetSubString(input,0,0)));
   if(result & 0x80000000)//multibyte, continuing to use base64 is impractical because it requires smart shifting.
       return  (   (  0x0000003f &  result       ) |
                   (( 0x00003f00 &  result) >> 2 ) | 
                   (( 0x003f0000 &  result) >> 4 ) | 
                   (( 0x3f000000 & (result = (integer)("0x"+llGetSubString(input,-8,-1)))) >> 6 ) | 
                   (( 0x0000003f &  result) << 24) | 
                   (( 0x00000100 & (result = (integer)("0x"+llDeleteSubString(input = (string)llParseString2List(llEscapeURL(input),(list)"%",[]),-8,-1)))) << 22)
               ) & (  0x7FFFFFFF >> (5 * ((integer)(llLog(~result) / 0.69314718055994530941723212145818) - 25)));

// (( 0x00000100 & (result = (integer)("0x"+llDeleteSubString(input,-8,-1)))) << 22) // ) & ( 0x7FFFFFFF >> (30 - (5 * (llStringLength(input = (string)llParseString2List(llEscapeURL(input),(list)"%",[])) >> 1))));

   return result >> 24;

}

string UnicodeIntegerToUTF8(integer input)//LSLEditor Unsafe, LSO Safe {

   integer bytes = llCeil((llLog(input) / 0.69314718055994530941723212145818));
   string result = "%" + byte2hex((input >> (6 * bytes)) | ((0x3F80 >> bytes) << !(bytes = ((input >= 0x80) * (bytes + ~(((1 << bytes) - input) > 0)) / 5))));
   while (bytes)
       result += "%" + byte2hex((((input >> (6 * (bytes = ~-bytes))) | 0x80) & 0xBF));
   return llUnescapeURL(result);

}

string byte2hex(integer x)//LSLEditor Safe, LSO Safe {//Helper function for use with unicode characters.

   integer y = (x >> 4) & 0xF;
   return llGetSubString(hexc, y, y) + llGetSubString(hexc, x & 0xF, x & 0xF);

}//This function would benefit greatly from the DUP opcode, it would remove 19 bytes.

string hexc="0123456789ABCDEF";

//} Combined Library</lsl>

Mono Safe

These versions are Mono and LSO safe but will not execute as quickly in LSO as the Mono Unsafe versions

//===================================================//
//                 Combined Library                  //
//             "Nov  3 2007", "00:46:15"             //
//  Copyright (C) 2004-2007, Strife Onizuka (cc-by)  //
//    http://creativecommons.org/licenses/by/3.0/    //
//===================================================//
//{

integer UTF8ToUnicodeInteger(string input)//Mono Safe, LSO Safe
{
    integer result = llBase64ToInteger(llStringToBase64(input = llGetSubString(input,0,0)));
    if(result & 0x80000000){//multibyte, continuing to use base64 is impractical because it requires smart shifting.
        integer end = (integer)("0x"+llGetSubString(input = (string)llParseString2List(llEscapeURL(input),(list)"%",[]),-8,-1));
        integer begin = (integer)("0x"+llDeleteSubString(input,-8,-1));
        return  (   (  0x0000003f &  end       ) |
                    (( 0x00003f00 &  end) >> 2 ) | 
                    (( 0x003f0000 &  end) >> 4 ) | 
                    (( 0x3f000000 &  end) >> 6 ) |
                    (( 0x0000003f &  begin) << 24) |
                    (( 0x00000100 &  begin) << 22) ) & 
                    (0x7FFFFFFF >> (5 * ((integer)(llLog(~result) / 0.69314718055994530941723212145818) - 25)));
    }
    return result >> 24;
}

string UnicodeIntegerToUTF8(integer input)//Mono Safe, LSO Safe
{
    integer bytes = llCeil(llLog(input) / 0.69314718055994530941723212145818);
    bytes = (input >= 0x80) * (bytes + ~(((1 << bytes) - input) > 0)) / 5;//adjust
    string result = "%" + byte2hex((input >> (6 * bytes)) | ((0x3F80 >> bytes) << !bytes));
    while (bytes)
        result += "%" + byte2hex((((input >> (6 * (bytes = ~-bytes))) | 0x80) & 0xBF));
    return llUnescapeURL(result);
}

string byte2hex(integer x)//Mono Safe, LSO Safe
{//Helper function for use with unicode characters.
    integer y = (x >> 4) & 0xF;
    return llGetSubString(hexc, y, y) + llGetSubString(hexc, x & 0xF, x & 0xF);
}//This function would benifit greatly from the DUP opcode, it would remove 19 bytes.

string hexc="0123456789ABCDEF";

//} Combined Library