opusmagnum-puzzle-editor/utf.js at master · kotritrona/opusmagnum-puzzle-editor · GitHub

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(function(exports) {'use strict';

function utf16to8(str) {
    var out, i, len, c, c1;
    out = "";
    len = str.length;
    for (i = 0; i < len; i++) {
        c = str.charCodeAt(i);
        if ((c >= 0x0001) && (c <= 0x007F)) {
            out += str.charAt(i);
        } else if(c >= 0xd800 && c < 0xdc00 && (c1 = str.charCodeAt(1+i)) >= 0xdc00 && c1 < 0xe000) {
        		c = (((c & 0x3ff) << 10) | (c1 & 0x3ff)) + 0x10000;
        		out += String.fromCharCode(0xF0 | ((c >> 18) & 0x07));
            out += String.fromCharCode(0x80 | ((c >> 12) & 0x3F));
            out += String.fromCharCode(0x80 | ((c >> 6) & 0x3F));
            out += String.fromCharCode(0x80 | ((c >> 0) & 0x3F));
        		++i;
        } else if (c > 0x07FF) {
            out += String.fromCharCode(0xE0 | ((c >> 12) & 0x0F));
            out += String.fromCharCode(0x80 | ((c >> 6) & 0x3F));
            out += String.fromCharCode(0x80 | ((c >> 0) & 0x3F));
        } else {
            out += String.fromCharCode(0xC0 | ((c >> 6) & 0x1F));
            out += String.fromCharCode(0x80 | ((c >> 0) & 0x3F));
        }
    }
    return out;
}
function utf8to16(str) {
    var out, i, len, c;
    var char2, char3, char4;
    out = "";
    len = str.length;
    i = 0;
    while (i < len) {
        c = str.charCodeAt(i++);
        switch (c >> 4) {
        case 0:case 1:case 2:case 3:case 4:case 5:case 6:case 7:
            out += str.charAt(i - 1);
            break;
        case 12:case 13:
            char2 = str.charCodeAt(i++);
            out += String.fromCharCode(((c & 0x1F) << 6) | (char2 & 0x3F));
            break;
        case 14:
            char2 = str.charCodeAt(i++);
            char3 = str.charCodeAt(i++);
            out += String.fromCharCode(((c & 0x0F) << 12) | ((char2 & 0x3F) << 6) | (char3 & 0x3F));
            break;
        case 15:
            char2 = str.charCodeAt(i++);
            char3 = str.charCodeAt(i++);
            char4 = str.charCodeAt(i++);
            out += String.fromCodePoint(((c & 0x07) << 18) | ((char2 & 0x3F) << 12) | ((char3 & 0x3F) << 6) | (char4 & 0x3F));
            break;
        }
    }
    return out;
}

exports.utf16to8 = utf16to8;
exports.utf8to16 = utf8to16;
})(window);