using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace RS.Common
{
    /// <summary>
    /// ASCII 帮助类
    /// </summary>
    public static class ASCIIHelper
    {
        /// <summary>
        /// 含中文字符串转ASCII
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static string Str2ASCII(String str)
        {
            //这里我们将采用2字节一个汉字的方法来取出汉字的16进制码
            byte[] textbuf = Encoding.Default.GetBytes(str);
            //用来存储转换过后的ASCII码
            string textAscii = string.Empty;

            for (int i = 0; i < textbuf.Length; i++)
            {
                textAscii += textbuf[i].ToString("X");
            }
            return textAscii;
        }

        /// <summary>
        /// ASCII转含中文字符串
        /// </summary>
        /// <param name="textAscii">ASCII字符串</param>
        /// <returns></returns>
        public static string ASCII2Str(string textAscii)
        {

            int k = 0;//字节移动偏移量
            byte[] buffer = new byte[textAscii.Length / 2];//存储变量的字节
            for (int i = 0; i < textAscii.Length / 2; i++)
            {
                //每两位合并成为一个字节
                buffer[i] = byte.Parse(textAscii.Substring(k, 2), System.Globalization.NumberStyles.HexNumber);
                k = k + 2;
            }
            //将字节转化成汉字
            return Encoding.Default.GetString(buffer);
        }

        /// <summary>
        /// 16进制转字符串
        /// </summary>
        /// <param name="hexNumber"></param>
        /// <returns></returns>
        public static string int16ToASCII(string hexNumber)
        {
            //int decimalValue = Convert.ToInt32(hexNumber, 16); // 将十六进制转换为十进制
            string binaryString = Convert.ToString(Convert.ToInt32(hexNumber), 2); // 将十进制转换为二进制
            int length = binaryString.Length;
            // 确保二进制字符串的长度是8的倍数  
            int xlength = length % 8;
            if (length % 8 != 0)
            {
                for (int i = 0; i < 8 - xlength; i++)
                {
                    binaryString = "0" + binaryString;
                }
            }

            // 分割二进制字符串为每8位一组  
            string[] binaryChunks = new string[length / 8];
            for (int i = 0; i < binaryChunks.Length; i++)
            {
                binaryChunks[i] = binaryString.Substring(i * 8, 8);
            }

            // 转换每个二进制组为ASCII字符  
            char[] asciiCharacters = new char[binaryChunks.Length];
            for (int i = 0; i < binaryChunks.Length; i++)
            {
                int asciiValue = Convert.ToInt32(binaryChunks[i], 2);
                asciiCharacters[i] = (char)asciiValue;
            }

            // 将字符数组转换为字符串  
            string asciiString = new string(asciiCharacters);
            if (asciiString.Length < 2)
            {
                asciiString = "0" + asciiString;
            }
            return asciiString;
        }
    }
}