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

namespace CommonUtils.Tool
{
    public class HexUtils
    {


        /// <summary>
        /// 字节数组转16进制字符串
        /// </summary>
        /// <param name="bytes"></param>
        /// <param name="start"></param>
        /// <param name="count"></param>
        /// <returns></returns>
        public string ByteToHex(byte[] bytes, int start, int count)
        {
            StringBuilder result = new StringBuilder();
            try
            {
                if ( bytes != null )
                {
                    for ( int i = start; i < count; i++ )
                    {
                        if ( bytes.Length < i )
                            break;
                        //两个16进制用空格隔开,方便看数据
                        if ( i == start )
                            result.Append(bytes[ i ].ToString("X2"));
                        else
                            result.Append(" " + bytes[ i ].ToString("X2"));
                    }
                }
                return result.ToString();
            }
            catch ( Exception )
            {
                return "";
            }
        }

        /// <summary>
        /// 字符串转16进制格式,不够自动前面补零
        /// </summary>
        /// <param name="hexString"></param>
        /// <returns></returns>
        public byte[] HexToByte(string hexString)
        {
            hexString = hexString.Replace(" ", "");//清除空格
            if ( ( hexString.Length % 2 ) != 0 )//奇数个
                hexString = hexString + " ";

            byte[] result = new byte[(hexString.Length) / 2];
            for ( int i = 0; i < result.Length; i++ )
            {
                result[ i ] = Convert.ToByte(hexString.Substring(i * 2, 2).Replace(" ", ""), 16);
            }
            return result;
        }


    }
}