C#中利用SharpZipLib进行压缩和解压

/// <summary>
/// 压缩文件
/// </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)
{
//如果文件没有找到，则报错
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)
{
//打开压缩文件
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();
}
}
}

/// <summary>
/// 解压文件
/// </summary>

using system;
using system.text;
using system.collections;
using system.io;
using system.diagnostics;
using system.runtime.serialization.formatters.binary;
using system.data;

using icsharpcode.sharpziplib.bzip2;
using icsharpcode.sharpziplib.zip;
using icsharpcode.sharpziplib.zip.compression;
using icsharpcode.sharpziplib.zip.compression.streams;
using icsharpcode.sharpziplib.gzip;

namespace decompression
{
public class unzipclass
{
public void unzip(string[] args)
{
zipinputstream s = new zipinputstream(file.openread(args[0]));

zipentry theentry;
while ((theentry = s.getnextentry()) != null)
{

string directoryname = path.getdirectoryname(args[1]);
string filename = path.getfilename(theentry.name);

//生成解压目录
directory.createdirectory(directoryname);

if (filename != string.empty)
{
//解压文件到指定的目录
filestream streamwriter = file.create(args[1]+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();
}
}
}