String2Hex

Full Unicode Support

Uses UTF-8 encoding of characters. If you can get the character into a string in LSL, this will encode that character in hex.

For performance reasons you should really just get used to using Base64. Since LSL has no hex functions, implementing them comes at a great performance cost.

string String2Hex(string str){
    string b64 = (string)llParseString2List(llStringToBase64(str), ["="], []);
    integer length = ((llStringLength(b64) * 3) >> 1) & -2;
    b64 += "AAAAAAA"; // we will trim these off in the end, this works around SVC-104.
    integer count = -3;
    integer position = -4;
    string out;
    while ((count += 6) < length) {
        integer I = llBase64ToInteger(llGetSubString(b64, position += 4, position + 7)) | 1;//This is a bottle neck
        string T = "";
        do {
            integer A = (I >>  2) & 0x3C000000; //28 -> 26
            integer B = (I >>  4) & 0x00F00000; //24 -> 20
            integer C = (I >>  6) & 0x0003C000; //20 -> 14
            T += llGetSubString( //ABC
                llIntegerToBase64(
                    A + B + C + 0xD34D0000
                    - (0xF8000000 * (A / 0x28000000)) //lowercase=0x90000000, uppercase=0xF8000000
                    - (0x03E00000 * (B / 0x00A00000)) //lowercase=0x02400000, uppercase=0x03E00000
                    - (0x000F8000 * (C / 0x00028000)) //lowercase=0x00090000, uppercase=0x000F8000
                ), 0, 3);
        } while (((I = (I << 12)) & 0x1EE7);
        out += T;//This is a bottle neck
    }
    return llGetSubString(out, 0, length - 1);
}

string Hex2String(string hex) {
    integer length = (llStringLength(hex) + 1) & -2;
    while(length)
        hex = llInsertString(hex, length -= 2, "%");
    return llUnescapeURL(hex); //lol
}

Limited ASCII-7 Support

These functions only works for ASCII-7 non-control characters.

string c_chr=" !\"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~";


//	http://wiki.secondlife.com/wiki/Int2Hex
string int2hex(integer x){
	string toret;
	do{
		toret=llGetSubString("0123456789ABCDEF",x&0x0000000F,x&0x0000000F)+toret;
	}while (x=x>>4&0x0FFFFFFF);
	return toret;
}

string str2hex(string str){
	string ret="";
	integer strlen=llStringLength(str);
	integer i=0;
	for(;i<strlen;++i){
		ret+=int2hex(32+llSubStringIndex(c_chr,llGetSubString(str,i,i)));
	}
	return ret;
}

string hex2str(string str){
	string ret="";
	integer strlen=llStringLength(str);
	integer i=0;integer index;
	for(;i<strlen;i+=2){
		index=((integer)("0x"+llGetSubString(str,i,i+1)))-32;
		ret+=llGetSubString(c_chr,index,index);
	}
	return ret;
}

default{
	state_entry(){
		llOwnerSay(str2hex("test ~"));
		llOwnerSay(hex2str("74657374207E"));
	}
}