/// <summary>

/// Zip压缩与解压缩

/// </summary>

public class ZipHelper

{

    /// <summary>

    /// 压缩单个文件

    /// </summary>

    /// <param name="fileToZip">要压缩的文件</param>

    /// <param name="zipedFile">压缩后的文件</param>

    /// <param name="compressionLevel">压缩等级</param>

    /// <param name="blockSize">每次写入大小</param>

    public static void ZipFile(string fileToZip, string zipedFile, int compressionLevel, int blockSize)

    {

        //如果文件没有找到，则报错

        if (!System.IO.File.Exists(fileToZip))

        {

            throw new System.IO.FileNotFoundException("指定要压缩的文件: " + fileToZip + " 不存在!");

        }

        using (System.IO.FileStream ZipFile = System.IO.File.Create(zipedFile))

        {

            using (ZipOutputStream ZipStream = new ZipOutputStream(ZipFile))

            {

                using (System.IO.FileStream StreamToZip = new System.IO.FileStream(fileToZip, System.IO.FileMode.Open, System.IO.FileAccess.Read))

                {

                    string fileName = fileToZip.Substring(fileToZip.LastIndexOf("\\") + );

                    ZipEntry ZipEntry = new ZipEntry(fileName);

                    ZipStream.PutNextEntry(ZipEntry);

                    ZipStream.SetLevel(compressionLevel);

                    byte[] buffer = new byte[blockSize];

                    int sizeRead = ;

                    try

                    {

                        do

                        {

                            sizeRead = StreamToZip.Read(buffer, , buffer.Length);

                            ZipStream.Write(buffer, , sizeRead);

                        }

                        while (sizeRead > );

                    }

                    catch (System.Exception ex)

                    {

                        throw ex;

                    }

                    StreamToZip.Close();

                }

                ZipStream.Finish();

                ZipStream.Close();

            }

            ZipFile.Close();

        }

    }

    /// <summary>

    /// 压缩单个文件

    /// </summary>

    /// <param name="fileToZip">要进行压缩的文件名</param>

    /// <param name="zipedFile">压缩后生成的压缩文件名</param>

    public static void ZipFile(string fileToZip, string zipedFile)

    {

        //如果文件没有找到，则报错

        if (!File.Exists(fileToZip))

        {

            throw new System.IO.FileNotFoundException("指定要压缩的文件: " + fileToZip + " 不存在!");

        }

        using (FileStream fs = File.OpenRead(fileToZip))

        {

            byte[] buffer = new byte[fs.Length];

            fs.Read(buffer, , buffer.Length);

            fs.Close();

            using (FileStream ZipFile = File.Create(zipedFile))

            {

                using (ZipOutputStream ZipStream = new ZipOutputStream(ZipFile))

                {

                    string fileName = fileToZip.Substring(fileToZip.LastIndexOf("\\") + );

                    ZipEntry ZipEntry = new ZipEntry(fileName);

                    ZipStream.PutNextEntry(ZipEntry);

                    ZipStream.SetLevel();

                    ZipStream.Write(buffer, , buffer.Length);

                    ZipStream.Finish();

                    ZipStream.Close();

                }

            }

        }

    }

    /// <summary>

    /// 压缩多层目录

    /// </summary>

    /// <param name="strDirectory">The directory.</param>

    /// <param name="zipedFile">The ziped file.</param>

    public static void ZipFileDirectory(string strDirectory, string zipedFile)

    {

        using (System.IO.FileStream ZipFile = System.IO.File.Create(zipedFile))

        {

            using (ZipOutputStream s = new ZipOutputStream(ZipFile))

            {

                ZipSetp(strDirectory, s, "");

            }

        }

    }

    /// <summary>

    /// 递归遍历目录

    /// </summary>

    /// <param name="strDirectory">The directory.</param>

    /// <param name="s">The ZipOutputStream Object.</param>

    /// <param name="parentPath">The parent path.</param>

    private static void ZipSetp(string strDirectory, ZipOutputStream s, string parentPath)

    {

        if (strDirectory[strDirectory.Length - ] != Path.DirectorySeparatorChar)

        {

            strDirectory += Path.DirectorySeparatorChar;

        }

        Crc32 crc = new Crc32();

        string[] filenames = Directory.GetFileSystemEntries(strDirectory);

        foreach (string file in filenames)// 遍历所有的文件和目录

        {

            if (Directory.Exists(file))// 先当作目录处理如果存在这个目录就递归Copy该目录下面的文件

            {

                string pPath = parentPath;

                pPath += file.Substring(file.LastIndexOf("\\") + );

                pPath += "\\";

                ZipSetp(file, s, pPath);

            }

            else // 否则直接压缩文件

            {

                //打开压缩文件

                using (FileStream fs = File.OpenRead(file))

                {

                    byte[] buffer = new byte[fs.Length];

                    fs.Read(buffer, , buffer.Length);

                    string fileName = parentPath + file.Substring(file.LastIndexOf("\\") + );

                    ZipEntry entry = new ZipEntry(fileName);

                    entry.DateTime = DateTime.Now;

                    entry.Size = fs.Length;

                    fs.Close();

                    crc.Reset();

                    crc.Update(buffer);

                    entry.Crc = crc.Value;

                    s.PutNextEntry(entry);

                    s.Write(buffer, , buffer.Length);

                }

            }

        }

    }

    /// <summary>

    /// 解压缩一个 zip 文件。

    /// </summary>

    /// <param name="zipedFile">The ziped file.</param>

    /// <param name="strDirectory">The STR directory.</param>

    /// <param name="password">zip 文件的密码。</param>

    /// <param name="overWrite">是否覆盖已存在的文件。</param>

    public void UnZip(string zipedFile, string strDirectory, string password, bool overWrite)

    {

        if (strDirectory == "")

            strDirectory = Directory.GetCurrentDirectory();

        if (!strDirectory.EndsWith("\\"))

            strDirectory = strDirectory + "\\";

        using (ZipInputStream s = new ZipInputStream(File.OpenRead(zipedFile)))

        {

            s.Password = password;

            ZipEntry theEntry;

            while ((theEntry = s.GetNextEntry()) != null)

            {

                string directoryName = "";

                string pathToZip = "";

                pathToZip = theEntry.Name;

                if (pathToZip != "")

                    directoryName = Path.GetDirectoryName(pathToZip) + "\\";

                string fileName = Path.GetFileName(pathToZip);

                Directory.CreateDirectory(strDirectory + directoryName);

                if (fileName != "")

                {

                    if ((File.Exists(strDirectory + directoryName + fileName) && overWrite) || (!File.Exists(strDirectory + directoryName + fileName)))

                    {

                        using (FileStream streamWriter = File.Create(strDirectory + directoryName + fileName))

                        {

                            int size = ;

                            byte[] data = new byte[];

                            while (true)

                            {

                                size = s.Read(data, , data.Length);

                                if (size > )

                                    streamWriter.Write(data, , size);

                                else

                                    break;

                            }

                            streamWriter.Close();

                        }

                    }

                }

            }

            s.Close();

        }

    }

}