/* DOMString to UTF-8 array
function strToUTF8Arr(sDOMStr) {

        var aBytes, nChr, nStrLen = sDOMStr.length, nArrLen = 0,
            nMapIdx,
            nIdx, nChrIdx;

        /* mapping... */

        for (nMapIdx = 0; nMapIdx < nStrLen; nMapIdx++) {
            nChr = sDOMStr.charCodeAt(nMapIdx);
            nArrLen += nChr < 0x80 ? 1 : nChr < 0x800 ? 2 : nChr < 0x10000 ? 3 : nChr < 0x200000 ? 4 : nChr < 0x4000000 ? 5 : 6;
        }

        aBytes = new Uint8Array(nArrLen);

        /* transcription... */

        for (nIdx = 0, nChrIdx = 0; nIdx < nArrLen; nChrIdx++) {
            nChr = sDOMStr.charCodeAt(nChrIdx);
            if (nChr < 128) {
                /* one byte */
                aBytes[nIdx++] = nChr;
            } else if (nChr < 0x800) {
                /* two bytes */
                aBytes[nIdx++] = 192 + (nChr >>> 6);
                aBytes[nIdx++] = 128 + (nChr & 63);
            } else if (nChr < 0x10000) {
                /* three bytes */
                aBytes[nIdx++] = 224 + (nChr >>> 12);
                aBytes[nIdx++] = 128 + (nChr >>> 6 & 63);
                aBytes[nIdx++] = 128 + (nChr & 63);
            } else if (nChr < 0x200000) {
                /* four bytes */
                aBytes[nIdx++] = 240 + (nChr >>> 18);
                aBytes[nIdx++] = 128 + (nChr >>> 12 & 63);
                aBytes[nIdx++] = 128 + (nChr >>> 6 & 63);
                aBytes[nIdx++] = 128 + (nChr & 63);
            } else if (nChr < 0x4000000) {
                /* five bytes */
                aBytes[nIdx++] = 248 + (nChr >>> 24);
                aBytes[nIdx++] = 128 + (nChr >>> 18 & 63);
                aBytes[nIdx++] = 128 + (nChr >>> 12 & 63);
                aBytes[nIdx++] = 128 + (nChr >>> 6 & 63);
                aBytes[nIdx++] = 128 + (nChr & 63);
            } else /* if (nChr <= 0x7fffffff) */ {
                /* six bytes */
                aBytes[nIdx++] = 252 + /* (nChr >>> 32) is not possible in ECMAScript! So...: */ (nChr / 1073741824);
                aBytes[nIdx++] = 128 + (nChr >>> 24 & 63);
                aBytes[nIdx++] = 128 + (nChr >>> 18 & 63);
                aBytes[nIdx++] = 128 + (nChr >>> 12 & 63);
                aBytes[nIdx++] = 128 + (nChr >>> 6 & 63);
                aBytes[nIdx++] = 128 + (nChr & 63);
            }
        }

        return aBytes;

    }