public static <T> T parseObject(byte[] bytes, int offset, int len,
                                    Charset charset,
                                    Type clazz,
                                    ParserConfig config,
                                    ParseProcess processor,
                                    int featureValues,
                                    Feature... features) {
        if (charset == null) {
            charset = IOUtils.UTF8;
        }

        String strVal;
        if (charset == IOUtils.UTF8) {
            char[] chars = allocateChars(bytes.length);
           // 如果使用gzip编码，那么读取出来的len=-1,所以直接返回null
            int chars_len = IOUtils.decodeUTF8(bytes, offset, len, chars);
            if (chars_len < 0) {
                return null;
            }
            strVal = new String(chars, 0, chars_len);
        } else {
            if (len < 0) {
                return null;
            }
            strVal = new String(bytes, offset, len, charset);
        }
        return (T) parseObject(strVal, clazz, config, processor, featureValues, features);
    }