关于性能和优化疑问 about fastjson2 HOT 6 CLOSED

            if (b == ',') {
                this.offset = offset + 1;

                // inline next
                ch = (char) bytes[this.offset++];
                while (ch <= ' ' && ((1L << ch) & SPACE) != 0) {
                    if (this.offset >= end) {
                        ch = EOI;
                    } else {
                        ch = (char) bytes[this.offset++];
                    }
                }
            } else {
                this.offset = offset + 1;
                this.ch = (char) b;
            }

_for:
            for (int i = 0; ; ++i) {
                byte c = bytes[offset];
                if (c == '\\') {
                    valueEscape = true;
                    c = bytes[++offset];
                    switch (c) {
                        case 'u': {
                            offset += 4;
                            break;
                        }
                        case 'x': {
                            offset += 2;
                            break;
                        }
                        default:
                            // skip
                            break;
                    }
                    offset++;
                    continue;
                }

                if (c == quote) {
                    valueLength = i;
                    break _for;
                }
                offset++;
            }

} else if (ch >= '\uD800' && ch < ('\uDFFF' + 1)) { //  //Character.isSurrogate(c)
                final int uc;
                if (ch >= '\uD800' && ch < ('\uDBFF' + 1)) { // Character.isHighSurrogate(c)
                    if (chars.length - i < 2) {
                        uc = -1;
                    } else {
                        char d = chars[i + 1];
                        // d >= '\uDC00' && d < ('\uDFFF' + 1)
                        if (d >= '\uDC00' && d < ('\uDFFF' + 1)) { // Character.isLowSurrogate(d)
                            uc = ((ch << 10) + d) + (0x010000 - ('\uD800' << 10) - '\uDC00'); // Character.toCodePoint(c, d)
                        } else {
//                            throw new JSONException("encodeUTF8 error", new MalformedInputException(1));
                            bytes[off++] = (byte) '?';
                            continue;
                        }
                    }
                } else {
                    //
                    if (ch >= '\uDC00' && ch < ('\uDFFF' + 1)) { // Character.isLowSurrogate(c)
                        bytes[off++] = (byte) '?';
                        continue;
//                        throw new JSONException("encodeUTF8 error", new MalformedInputException(1));
                    } else {
                        uc = ch;
                    }
                }
                if (uc < 0) {
                    bytes[off++] = (byte) '?';
                } else {
                    bytes[off++] = (byte) (0xf0 | ((uc >> 18)));
                    bytes[off++] = (byte) (0x80 | ((uc >> 12) & 0x3f));
                    bytes[off++] = (byte) (0x80 | ((uc >> 6) & 0x3f));
                    bytes[off++] = (byte) (0x80 | (uc & 0x3f));
                    i++; // 2 chars
                }