C#实现加压解压（v2.1）

在前一版本的基础上改进了一些地方
把压缩文件名加进压缩后的文件中，解压还原成原文件而不是无尾文件

如果这个版本代码难解，可以先看看上一版本

界面：


代码清单：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.IO;
using System.IO.Compression;

namespace zipTest
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        /*取消*/
        private void button4_Click(object sender, EventArgs e)
        {
            this.Close();
        }
        /*确定*/
        private void button3_Click(object sender, EventArgs e)
        {
            bool success = false; //默认失败
            string err = "";
            try
            {
                if (r_compress.Checked == true)
                {
                    success = GzipCompress(t_source.Text, t_dis.Text);
                }
                if (r_deCompress.Checked == true)
                {
                    success = GzipDecompress(t_source.Text, t_dis.Text);
                }
            }
            catch (Exception ex)
            {
                err=ex.Message.ToString();
            }
            if (success == false)
                MessageBox.Show("操作失败！" + err);
            else
                MessageBox.Show("操作成功！");
        }
        /*选择源文件*/
        private void button1_Click(object sender, EventArgs e)
        {
            if (openFileDialog1.ShowDialog() == DialogResult.OK)
            {
                t_source.Text = openFileDialog1.FileName;
            }
        }
        /*选择目标路径*/
        private void button2_Click(object sender, EventArgs e)
        {
            if (folderBrowserDialog1.ShowDialog() == DialogResult.OK)
            {
                t_dis.Text = folderBrowserDialog1.SelectedPath;
            }
        }
        /*加压*/
        public bool GzipCompress(string sourceFile,string disPath)
        {
            //路径合法性检测
            if (!File.Exists(sourceFile))
                throw new FileNotFoundException();
            if (!Directory.Exists(disPath))
                throw new DirectoryNotFoundException();
            if (!disPath.EndsWith("\\"))
                disPath += "\\";
            //生成压缩后文件名
            string oldName = Path.GetFileNameWithoutExtension(sourceFile);
            string newName = oldName + "压缩文件.gzip";
            bool result = true;//默认成功
            FileStream fs1 = null;
            FileStream fs2 = null;
            GZipStream zips =null;
            try
            {
                fs1 = new FileStream(sourceFile, FileMode.Open, FileAccess.Read);
                fs2 = new FileStream(disPath + newName, FileMode.OpenOrCreate, FileAccess.Write);
                zips = new GZipStream(fs2, CompressionMode.Compress);
                byte[] tempb = new byte[fs1.Length];
                fs1.Read(tempb, 0, (int)fs1.Length);
                //将加压前文件名保存到加压前的数组中
                //第一个字节保存文件名的长度，
                byte[] exb = System.Text.Encoding.Unicode.GetBytes(Path.GetFileName(sourceFile));
                byte[] lastb = new byte[fs1.Length + exb.Length+1];
                lastb[0] = Convert.ToByte(exb.Length);
                exb.CopyTo(lastb, 1);
                tempb.CopyTo(lastb, exb.Length+1);
                //压缩文件
                zips.Write(lastb, 0, lastb.Length);
            }
            catch(Exception ex)
            {
                result=false; //执行失败
                throw ex;
            }
            finally
            {
                if (zips != null)
                    zips.Close();
                if (fs1 != null)
                    fs1.Close();
                if (fs2 != null)
                    fs2.Close();
            }
            return result;
        }
        /*解压*/
        public bool GzipDecompress(string sourceFile,string disPath)
        {
            //路径合法性检测
            if (!File.Exists(sourceFile))
                throw new FileNotFoundException();
            if (!Directory.Exists(disPath))
                throw new DirectoryNotFoundException();
            if (!disPath.EndsWith("\\"))
                disPath += "\\";
           
            bool result = true;//默认成功
            FileStream fs1 = null;
            FileStream fs2 = null;
            MemoryStream ms = null;
            GZipStream zips = null;
            try
            {
                fs1 = new FileStream(sourceFile, FileMode.Open, FileAccess.Read);
                ms = new MemoryStream();
                zips = new GZipStream(fs1, CompressionMode.Decompress);
                byte[] tempb = new byte[100];
                int size = 0;
                while (true)
                {
                    size = zips.Read(tempb, 0, 100);
                    if (size > 0)
                        ms.Write(tempb, 0, size);
                    else
                        break;
                }
                byte[] resultb = new byte[ms.Length];
                //分析出加压前的文件名exName
                ms.Position = 0;
                ms.Read(resultb, 0, (int)ms.Length);
                int exlen=Convert.ToInt16(resultb[0]);
                string exName = System.Text.Encoding.Unicode.GetString(resultb,1,exlen);
                string outFile = disPath + exName;
                fs2 = new FileStream(outFile, FileMode.OpenOrCreate, FileAccess.Write);
                fs2.Write(resultb, exlen + 1, resultb.Length - exlen - 1);
            }
            catch(Exception ex)
            {
                result = false; //执行失败
                throw ex;
            }
            finally
            {
                if (zips != null)
                    zips.Close();
                if (fs1 != null)
                    fs1.Close();
                if (fs2 != null)
                    fs2.Close();
                if (ms != null)
                    ms.Close();
            }
            return result;
        }
    }
}