var hexStringToBytes = function (hexString: string | null) {
    if (hexString == null || hexString == "") {
        return null;
    }
    hexString = hexString.toUpperCase();
    let Length = hexString.length / 2;
    let hexChars = stringToByte(hexString);
    let d = [];
    for (let i = 0; i < Length; i++) {
        let pos = i * 2;
        let a = charToByte(hexChars[pos]) << 4 | charToByte(hexChars[pos + 1]);
        d.push(a);
    }
    return d;
};
 
var charToByte = function (c: any) {
    let a = String.fromCharCode(c).toUpperCase();
    return "0123456789ABCDEF".indexOf(a);
};
 
 
 
var bytesToHexString = function (src: any) {
    let d = "";
    if (src == null || src.length <= 0) {
        return null;
    }
    for (let i = 0; i < src.length; i++) {
        let v = src[i] & 0xFF;
        let hv = intTo16value(v);
        d += hv;
    }
    return d
}
 
 
/**
 * 将字符串转化成byte数组
 * @param {字符串} str
 */
var stringToByte = function (str) {
    var bytes = new Array();
    var len, c;
    len = str.length;
    for (var i = 0; i < len; i++) {
        c = str.charCodeAt(i);
        if (c >= 0x010000 && c <= 0x10FFFF) {
            bytes.push(((c >> 18) & 0x07) | 0xF0);
            bytes.push(((c >> 12) & 0x3F) | 0x80);
            bytes.push(((c >> 6) & 0x3F) | 0x80);
            bytes.push((c & 0x3F) | 0x80);
        } else if (c >= 0x000800 && c <= 0x00FFFF) {
            bytes.push(((c >> 12) & 0x0F) | 0xE0);
            bytes.push(((c >> 6) & 0x3F) | 0x80);
            bytes.push((c & 0x3F) | 0x80);
        } else if (c >= 0x000080 && c <= 0x0007FF) {
            bytes.push(((c >> 6) & 0x1F) | 0xC0);
            bytes.push((c & 0x3F) | 0x80);
        } else {
            bytes.push(c & 0xFF);
        }
    }
    return bytes;
};
 
/**
 * 将数组转变成字符串
 * @param {byte数组} arr
 */
var byteToString = function (arr) {
    if (typeof arr === 'string') {
        return arr;
    }
    var str = '',
        _arr = arr;
    for (var i = 0; i < _arr.length; i++) {
        var one = _arr[i].toString(2),
            v = one.match(/^1+?(?=0)/);
        if (v && one.length == 8) {
            var bytesLength = v[0].length;
            var store = _arr[i].toString(2).slice(7 - bytesLength);
            for (var st = 1; st < bytesLength; st++) {
                store += _arr[st + i].toString(2).slice(2);
            }
            str += String.fromCharCode(parseInt(store, 2));
            i += bytesLength - 1;
        } else {
            str += String.fromCharCode(_arr[i]);
        }
    }
    return str;
};
 
 
/**
 * 字符串转Ascii
 * @param {*} strLine
 */
var stringToAscii = function (strLine) {
    let lineArr = stringToByte(strLine)
    let __strLine = '';
    for (var i = 0; i < lineArr.length; i++) {
 
        __strLine += intTo16value(lineArr[i]);
    }
 
    return __strLine;
};
 
/**
 * 10进制转16进制
 * @param {*} data
 */
var intTo16value = function (data) {
    return data.toString(16).toUpperCase().PadLeft(2, '0');
};
 
/**
 * 10进制转16进制
 * @param {*} data
 * @param {*} len
 */
var intToHex = function (data, len) {
    let intData = parseInt(data);
    return intData.toString(16).toUpperCase().PadLeft(len, '0');
};
 
/**
 * DateTime时间格式转换为8位不带毫秒的Unix时间戳
 * @param {*} time 
 * @returns 
 */
var convertDateTimeHex = function (time) {
    var timestamp = Date.parse(time) / 1000;
    return intToHex(timestamp, 8);
}
 
/**
 * 发布模块
 */
module.exports = {
    HexStringToBytes: hexStringToBytes,
    BytesToHexString: bytesToHexString,
    ByteToString: byteToString,
    StringToAscii: stringToAscii,
    IntToHex: intToHex,
    ConvertDateTimeHex: convertDateTimeHex
}