【13】MD5编码、Zlib压缩解压缩

1.MD5加密

    /// <summary>  
    /// 使用MD5加密算法  
    /// </summary>  
    /// <param name="md5MessageStr">需要加密的字符串</param>  
    /// <returns>加密后返回字符串</returns>  
    public static string GetMD5String(string md5MessageStr)  
    {  
        using (MD5 md5 = new MD5CryptoServiceProvider())  
        {  
            byte[] convertValue = Encoding.UTF8.GetBytes(md5MessageStr);  
            byte[] resultValue = md5.ComputeHash(convertValue);  
            string strResult = string.Empty;  
            for (int i = 0; i < 16; i++)  
            {  
                strResult += resultValue[i].ToString("x2");  
            }  
            return strResult;  
        }  
    }  

2.Zlib压缩解压缩

nuget获取zlib.net

        using System;  
        using System.Collections.Generic;  
        using System.IO;  
        using System.Linq;  
        using System.Web;  
        using zlib;  
          
        namespace LargePlatformService.Logic  
        {  
            public class ZLibNetHelper  
            {  
                /// <summary>    
                /// zlib.net 解压函数    
                /// </summary>    
                /// <param name="strSource">带解压数据源</param>    
                /// <returns>解压后的数据</returns>    
                public static string DeflateDecompress(string strSource)  
                {  
                    int data = 0;  
                    int stopByte = -1;  
                    byte[] Buffer = Convert.FromBase64String(strSource); // 解base64    
                    MemoryStream intms = new MemoryStream(Buffer);  
                    zlib.ZInputStream inZStream = new zlib.ZInputStream(intms);  
                    List<byte> inByteList = new List<byte>();  
                    int i = 0;  
                    while (stopByte != (data = inZStream.Read()))  
                    {  
                        inByteList.Add((byte)data);  
                    }  
                    inZStream.Close();  
                    return System.Text.Encoding.UTF8.GetString(inByteList.ToArray(), 0, inByteList.Count);  
          
                }  
          
                /// <summary>    
                /// zlib.net 压缩函数    
                /// </summary>    
                /// <param name="strSource">待压缩数据</param>    
                /// <returns>压缩后数据</returns>    
                public static string DeflateCompress(string strSource)  
                {  
                    MemoryStream outms = new MemoryStream();  
                    byte[] bytes = System.Text.Encoding.UTF8.GetBytes(strSource);  
                    MemoryStream inms = new MemoryStream(bytes);  
                    zlib.ZOutputStream outZStream = new zlib.ZOutputStream(outms, zlib.zlibConst.Z_DEFAULT_COMPRESSION);  
                    try  
                    {  
                        CopyStream(inms, outZStream);  
                    }  
                    catch (Exception ex)  
                    {  
                        throw ex;  
                    }  
                    finally  
                    {  
                        outZStream.Close();  
                    }  
                    return Convert.ToBase64String(outms.ToArray());  
                }  
          
          
                public static void CopyStream(System.IO.Stream input, System.IO.Stream output)  
                {  
                    byte[] buffer = new byte[2000];  
                    int len;  
                    while ((len = input.Read(buffer, 0, 2000)) > 0)  
                    {  
                        output.Write(buffer, 0, len);  
                    }  
                    output.Flush();  
                }        
            }  
        }