ICSharpCode二次封装

 

对ICSharpCode中文件压缩与解压进行二次封装.为开发人员提供简单友好的访问接口.类中引用了最新的ICSharpCode源码,下载地址:http://www.icsharpcode.net/OpenSource/SharpZipLib/DownloadLatestVersion.asp?what=SourceSamples

 

 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using DevLib.Zip;
using System.IO;
using DevLib.BZip2;
using DevLib.Checksums;

/**//// <summary>
/// 提供基本的文件压缩与解压缩操作,详细的处理请使用Devlib.Zip
/// </summary>
public class ZipHelper
{
    私有实现方法#region 私有实现方法
    private static string cutStr = "";
    private static void direct(DirectoryInfo di, ref ZipOutputStream s, Crc32 crc)
    {
        //DirectoryInfo di = new DirectoryInfo(filenames);
        DirectoryInfo[] dirs = di.GetDirectories("*");

        //遍历目录下面的所有的子目录
        foreach (DirectoryInfo dirNext in dirs)
        {
            //将该目录下的所有文件添加到 ZipOutputStream s 压缩流里面
            FileInfo[] a = dirNext.GetFiles();
            writeStream(ref s, a, crc);

            //递归调用直到把所有的目录遍历完成
            direct(dirNext, ref s, crc);
        }
    }
    private static void writeStream(ref ZipOutputStream s, FileInfo[] a, Crc32 crc)
    {
        foreach (FileInfo fi in a)
        {
            //string fifn = fi.FullName;
            FileStream fs = fi.OpenRead();

            byte[] buffer = new byte[fs.Length];
            fs.Read(buffer, 0, buffer.Length);


            //ZipEntry entry = new ZipEntry(file);    Path.GetFileName(file)
            string file = fi.FullName;
            file = file.Replace(cutStr, "");

            ZipEntry entry = new ZipEntry(file);

            entry.DateTime = DateTime.Now;

            // set Size and the crc, because the information
            // about the size and crc should be stored in the header
            // if it is not set it is automatically written in the footer.
            // (in this case size == crc == -1 in the header)
            // Some ZIP programs have problems with zip files that don't store
            // the size and crc in the header.
            entry.Size = fs.Length;
            fs.Close();

            crc.Reset();
            crc.Update(buffer);

            entry.Crc = crc.Value;

            s.PutNextEntry(entry);

            s.Write(buffer, 0, buffer.Length);
        }
    }
    #endregion

    /**//// <summary>
    /// 压缩单个文件
    /// </summary>
    /// <param name="fileToZip">源,需压缩的文件</param>
    /// <param name="zipedFile">目标文件</param>
    public static void PackFile(string fileToZip, string zipedFile)
    {
        PackFile(fileToZip, zipedFile, 9, 2048);
    }

    /**//// <summary>
    /// 压缩单个文件
    /// </summary>
    /// <param name="fileToZip">源,需压缩的文件</param>
    /// <param name="zipedFile">目标文件</param>
    /// <param name="compressionLevel">压缩级别</param>
    /// <param name="blockSize">缓存大小</param>
    public static void PackFile(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();
        }
        if (!zipedFile.ConvertString().ToLower().EndsWith(".zip"))
        {
            if (Path.GetFileName(zipedFile).IsNullOrEmpty())
                zipedFile += FileHelper.GetFileNameNoExtension(fileToZip);
            zipedFile += ".zip";
        }
        System.IO.FileStream StreamToZip = new System.IO.FileStream(fileToZip, System.IO.FileMode.Open, System.IO.FileAccess.Read);
        System.IO.FileStream ZipFile = System.IO.File.Create(zipedFile);
        ZipOutputStream ZipStream = new ZipOutputStream(ZipFile);
        ZipEntry ZipEntry = new ZipEntry(Path.GetFileName(fileToZip));
        ZipStream.PutNextEntry(ZipEntry);
        ZipStream.SetLevel(compressionLevel);
        byte[] buffer = new byte[blockSize];
        System.Int32 size = StreamToZip.Read(buffer, 0, buffer.Length);
        ZipStream.Write(buffer, 0, size);
        try
        {
            while (size < StreamToZip.Length)
            {
                int sizeRead = StreamToZip.Read(buffer, 0, buffer.Length);
                ZipStream.Write(buffer, 0, sizeRead);
                size += sizeRead;
            }
        }
        catch (System.Exception ex)
        {
            throw ex;
        }
        ZipStream.Finish();
        ZipStream.Close();
        StreamToZip.Close();
    }

    /**//// <summary>
    /// 压缩指定目录下指定文件(包括子目录下的文件)
    /// </summary>
    /// <param name="zippath">要压缩的目录所在的路径</param>
    /// <param name="zipfilename">为压缩后的文件名及其路径</param>
    /// <param name="fileFilter">文件过滤, 例如*.xml,这样只压缩.xml文件.</param>
    /// <param name="compressionLevel">文件压缩级别</param>
    public static bool PackFiles(string zippath, string zipfilename, string fileFilter, int compressionLevel)
    {
        try
        {
            if (!Directory.Exists(zippath))
            {
                throw new DirectoryNotFoundException();
            }
            if (!zipfilename.ConvertString().ToLower().EndsWith(".zip"))
            {
                if (Path.GetFileName(zipfilename).IsNullOrEmpty())
                    zipfilename += FileHelper.GetDirectoryName(zippath);
                zipfilename += ".zip";
            }
            if (!zippath.EndsWith("\\")) zippath = zippath + "\\";
            Crc32 crc = new Crc32();
            ZipOutputStream s = new ZipOutputStream(File.Create(zipfilename));

            s.SetLevel(compressionLevel); // 0 - store only to 9 - means best compression

            DirectoryInfo di = new DirectoryInfo(zippath);

            FileInfo[] a = di.GetFiles(fileFilter);

            cutStr = zippath.Trim();
            //压缩这个目录下的所有文件
            writeStream(ref s, a, crc);
            //压缩这个目录下子目录及其文件
            direct(di, ref s, crc);

            s.Finish();
            s.Close();
        }
        catch
        {
            return false;
        }
        return true;
    }
    
    /**//// <summary>
    /// 压缩文件夹内所有文件(包括子目录下的文件)
    /// </summary>
    /// <param name="zippath">要压缩的目录所在的路径 </param>
    /// <param name="zipfilename">压缩后的文件名及其路径</param>
    /// <returns></returns>
    public static bool PackFiles(string zippath, string zipfilename)
    {
        return PackFiles(zippath, zipfilename, "*.*", 9);
    }
   
    /**//// <summary>
    /// 解压缩文件(压缩文件中含有子目录)
    /// </summary>
    /// <param name="zipfilepath">待解压缩的文件路径</param>
    /// <param name="unzippath">解压缩到指定目录</param>
    public static void UnpackFiles(string zipfilepath, string unzippath)
    {

        if (!File.Exists(zipfilepath))
        {
            throw new FileNotFoundException(zipfilepath);
        }
        if (unzippath.IsNullOrEmpty()) unzippath = FileHelper.GetParentDirectoryPath(zipfilepath);
        if (!unzippath.EndsWith("\\")) unzippath += "\\";
        if (!Directory.Exists(unzippath)) Directory.CreateDirectory(unzippath);


        try
        {
            using (ZipInputStream s = new ZipInputStream(File.OpenRead(zipfilepath)))
            {

                ZipEntry theEntry;
                while ((theEntry = s.GetNextEntry()) != null)
                {
                    string directoryName = unzippath;
                    string fileName = Path.GetFileName(theEntry.Name);

                    // create directory
                    if (directoryName.Length > 0)
                    {
                        Directory.CreateDirectory(directoryName);
                    }

                    if (fileName != String.Empty)
                    {
                        using (FileStream streamWriter = File.Create(theEntry.Name))
                        {

                            int size = 2048;
                            byte[] data = new byte[2048];
                            while (true)
                            {
                                size = s.Read(data, 0, data.Length);
                                if (size > 0)
                                {
                                    streamWriter.Write(data, 0, size);
                                }
                                else
                                {
                                    break;
                                }
                            }
                        }
                    }
                }
            }
        }
        catch (Exception ex)
        {
            throw ex;
        }

    }



}