在做項目的時候需要將文件進行壓縮和解壓縮，於是就從http://www.icsharpcode.net下載了關於壓縮和解壓縮的源碼，但是下載下來後，面對這麼多的代碼，一時不知如何下手。只好耐下心來，慢慢的研究，總算找到了門路。針對自己的需要改寫了文件壓縮和解壓縮的兩個類，分別爲 ZipClass和UnZipClass。其中碰到了不少困難，就決定寫出來壓縮和解壓的程序後，一定把源碼貼出來共享，讓首次接觸壓縮和解壓縮的朋友可以少走些彎路。下面就來解釋如何C#利用sharpziplib進行文件的壓縮和解壓縮。
首先需要在項目裏C#利用sharpziplib.dll。然後修改其中的關於壓縮和解壓縮的類。實現源碼如下：
文件壓縮
/// <summary>
/// 壓縮文件
/// </summary>
using System;
using System.IO;
using ICSharpCode.SharpZipLib.Checksums;
using ICSharpCode.SharpZipLib.Zip;
using ICSharpCode.SharpZipLib.GZip;
namespace Compression
{
public class ZipClass
{
public void ZipFile(string FileToZip, string ZipedFile ,
int CompressionLevel, int BlockSize)
{
//如果文件沒有找到，則報錯
if (! System.IO.File.Exists(FileToZip))
{
throw new System.IO.FileNotFoundException
("The specified file " + FileToZip + " could not be found. Zipping aborderd");
}
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("ZippedFile");
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();
}
public void ZipFileMain(string[] args)
{
string[] filenames = Directory.GetFiles(args[0]);
crc32 crc = new Crc32();
ZipOutputStream s = new ZipOutputStream(File.Create(args[1]));
s.setlevel(6); // 0 - store only to 9 - means best compression
foreach (string file in filenames)
{
//打開壓縮文件
FileStream fs = File.OpenRead(file);
byte[] buffer = new byte[fs.Length];
fs.Read(buffer, 0, buffer.Length);
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);
}
s.finish();
s.Close();
}
}
}
文件解壓縮
public class UnZipClass
{
/// <summary>
/// 解壓文件
/// </summary>
/// <param name="args">包含要解壓的文件名和要解壓到的目錄名數組</param>
public void UnZip(string[] args)
{
ZipInputStream s = new ZipInputStream(File.OpenRead(args[0]));
try
{
string directoryName = Path.GetDirectoryName(args[1]);
ZipEntry theEntry;
while ((theEntry = s.GetNextEntry()) != null)
{
string fileName = Path.GetFileName(theEntry.Name);
string path = directoryName +"\\" +Path.GetDirectoryName(theEntry.Name);
//生成解壓目錄
if (!Directory.Exists(path))
{
Directory.CreateDirectory(path);
}
if (fileName != String.Empty)
{
//解壓文件到指定的目錄
FileStream streamWriter = File.Create(path +"\\"+ fileName);
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;
}
}
streamWriter.Close();
}
}
s.Close();
}
catch (Exception eu)
{
throw eu;
}
finally
{
s.Close();
}
}//end UnZip
public static bool UnZipFile(string file, string dir)
{
try
{
if (!Directory.Exists(dir))
Directory.CreateDirectory(dir);
string fileFullName = Path.Combine(dir, file);
ZipInputStream s = new ZipInputStream(File.OpenRead(fileFullName));
ZipEntry theEntry;
while ((theEntry = s.GetNextEntry()) != null)
{
string directoryName = Path.GetDirectoryName(theEntry.Name);
string fileName = Path.GetFileName(theEntry.Name);
if (directoryName != String.Empty)
Directory.CreateDirectory(Path.Combine(dir, directoryName));
if (fileName != String.Empty)
{
FileStream streamWriter = File.Create(Path.Combine(dir, 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;
}
}
streamWriter.Close();
}
}
s.Close();
return true;
}
catch (Exception)
{
throw;
}
}
}
二進制字節流壓縮解壓縮
using System;
using ICSharpCode.SharpZipLib;
using ICSharpCode.SharpZipLib.Zip.Compression;
using System.IO;
namespace Lucene.Net.Index.Compression
{
public class SharpZipLibAdapter
{
public byte[] Compress(byte[] input)
{
// Create the compressor with highest level of compression
Deflater compressor = new Deflater();
compressor.SetLevel(Deflater.BEST_COMPRESSION);
// Give the compressor the data to compress
compressor.SetInput(input);
compressor.Finish();
/*
* Create an expandable byte array to hold the compressed data.
* You cannot use an array that's the same size as the orginal because
* there is no guarantee that the compressed data will be smaller than
* the uncompressed data.
*/
MemoryStream bos = new MemoryStream(input.Length);
// Compress the data
byte[] buf = new byte[1024];
while (!compressor.IsFinished)
{
int count = compressor.Deflate(buf);
bos.Write(buf, 0, count);
}
// Get the compressed data
return bos.ToArray();
}
public byte[] Uncompress(byte[] input)
{
Inflater decompressor = new Inflater();
decompressor.SetInput(input);
// Create an expandable byte array to hold the decompressed data
MemoryStream bos = new MemoryStream(input.Length);
// Decompress the data
byte[] buf = new byte[1024];
while (!decompressor.IsFinished)
{
int count = decompressor.Inflate(buf);
bos.Write(buf, 0, count);
}
// Get the decompressed data
return bos.ToArray();
}
}
}