压缩算法1

#region 压缩解压自符串

public static string ZipString(string unCompressedString)
{

byte[] bytData = System.Text.Encoding.UTF8.GetBytes(unCompressedString);
MemoryStream ms = new MemoryStream();
Stream s = new GZipStream(ms, CompressionMode.Compress);
s.Write(bytData, 0, bytData.Length);
s.Close();
byte[] compressedData = (byte[])ms.ToArray();
return System.Convert.ToBase64String(compressedData, 0, compressedData.Length);
}

public static string UnzipString(string unCompressedString)
{
System.Text.StringBuilder uncompressedString = new System.Text.StringBuilder();
byte[] writeData = new byte[4096];

byte[] bytData = System.Convert.FromBase64String(unCompressedString);
int totalLength = 0;
int size = 0;

Stream s = new GZipStream(new MemoryStream(bytData), CompressionMode.Decompress);
while (true)
{
size = s.Read(writeData, 0, writeData.Length);
if (size > 0)
{
totalLength += size;
uncompressedString.Append(System.Text.Encoding.UTF8.GetString(writeData, 0, size));
}
else
{
break;
}
}
s.Close();
return uncompressedString.ToString();
}

//Demo
//string abc = ZipString(txtCompressString.Text.Trim());
//string Result = UnzipString(abc);

#endregion

#region 压缩解压数据集

public static byte[] CompressionDataSet(DataSet dsOriginal)
{
if (dsOriginal == null) return null;
dsOriginal.RemotingFormat = SerializationFormat.Binary;
BinaryFormatter bFormatter = new BinaryFormatter();
MemoryStream mStream = new MemoryStream();
bFormatter.Serialize(mStream, dsOriginal);
byte[] bytes = mStream.ToArray();
MemoryStream oStream = new MemoryStream();
DeflateStream zipStream = new DeflateStream(oStream, CompressionMode.Compress);
zipStream.Write(bytes, 0, bytes.Length);
zipStream.Flush();
zipStream.Close();
return oStream.ToArray();
}

public static DataSet DecompressionDataSet(byte[] bytes)
{
if (bytes == null) return null;
MemoryStream mStream = new MemoryStream(bytes);
mStream.Seek(0, SeekOrigin.Begin);
DeflateStream unZipStream = new DeflateStream(mStream, CompressionMode.Decompress, true);
DataSet dsResult = new DataSet();
dsResult.RemotingFormat = SerializationFormat.Binary;
BinaryFormatter bFormatter = new BinaryFormatter();
dsResult = (DataSet)bFormatter.Deserialize(unZipStream);
return dsResult;
}

//Demo
//private void btnTest_Click(object sender, EventArgs e)
//{
// DataTable dt = new DataTable();
// DataSet ds = new DataSet();
// ds.Tables.Add(dt);
// byte[] abc = CompressionDataSet(ds);
// DataSet ss = DecompressionDataSet(abc);
// string dd = "ok";
//}

#endregion

#region 压缩解压文件

public static void CompressFile(string sourceFile, string destinationFile)
{
if (!File.Exists(sourceFile)) throw new FileNotFoundException();
FileStream sourceStream = new FileStream(sourceFile, FileMode.Open, FileAccess.Read, FileShare.Read);

byte[] buffer = new byte[sourceStream.Length];
int checkCounter = sourceStream.Read(buffer, 0, buffer.Length);
if (checkCounter != buffer.Length) throw new ApplicationException();
FileStream destinationStream = new FileStream(destinationFile, FileMode.OpenOrCreate, FileAccess.Write);

using (GZipStream compressedStream = new GZipStream(destinationStream, CompressionMode.Compress, true))
{
compressedStream.Write(buffer, 0, buffer.Length);
}
}

public static void DecompressFile(string sourceFile, string destinationFile)
{
if (!File.Exists(sourceFile)) throw new FileNotFoundException();
FileStream sourceStream = new FileStream(sourceFile, FileMode.Open);

byte[] quartetBuffer = new byte[4];
int position = (int)sourceStream.Length - 4;
sourceStream.Position = position;
sourceStream.Read(quartetBuffer, 0, 4);
sourceStream.Position = 0;
int checkLength = BitConverter.ToInt32(quartetBuffer, 0);
byte[] buffer = new byte[checkLength + 100];
GZipStream decompressedStream = new GZipStream(sourceStream, CompressionMode.Decompress, true);
int total = 0;
for (int offset = 0; ; )
{
int bytesRead = decompressedStream.Read(buffer, offset, 100);
if (bytesRead == 0) break;
offset += bytesRead;
total += bytesRead;
}
FileStream destinationStream = new FileStream(destinationFile, FileMode.Create);
destinationStream.Write(buffer, 0, total);
}

//DEMO
//private void btnCommpress_Click(object sender, EventArgs e)
//{
// string sourceFile = Application.StartupPath + @"\MTLOperatelog.txt";
// string destinationFile = Application.StartupPath + @"\abc.rar";
// CompressFile(sourceFile, destinationFile);
//}

//private void btnDecompressFile_Click(object sender, EventArgs e)
//{
// string sourceFile = Application.StartupPath + @"\abc.rar";
// string destinationFile = Application.StartupPath + @"\abc.txt";
// DecompressFile(sourceFile, destinationFile);
//}

#endregion

#region 压缩解压Ilist

public static byte[] CompressionArrayList(IList DataOriginal)
{
if (DataOriginal == null) return null;
BinaryFormatter bFormatter = new BinaryFormatter();
MemoryStream mStream = new MemoryStream();
bFormatter.Serialize(mStream, DataOriginal);
byte[] bytes = mStream.ToArray();
MemoryStream oStream = new MemoryStream();
DeflateStream zipStream = new DeflateStream(oStream, CompressionMode.Compress);
zipStream.Write(bytes, 0, bytes.Length);
zipStream.Flush();
zipStream.Close();
//
return oStream.ToArray();
}

public static IList DecompressionArrayList(byte[] bytes)
{
if (bytes == null) return null;
MemoryStream mStream = new MemoryStream(bytes);
mStream.Seek(0, SeekOrigin.Begin);
DeflateStream unZipStream = new DeflateStream(mStream, CompressionMode.Decompress, true);
IList dsResult = null;
BinaryFormatter bFormatter = new BinaryFormatter();
dsResult = (IList)bFormatter.Deserialize(unZipStream);
return dsResult;
}
#endregion

#region 压缩解压object

public static byte[] CompressionObject(object DataOriginal)
{
if (DataOriginal == null) return null;
BinaryFormatter bFormatter = new BinaryFormatter();
MemoryStream mStream = new MemoryStream();
bFormatter.Serialize(mStream, DataOriginal);
byte[] bytes = mStream.ToArray();
MemoryStream oStream = new MemoryStream();
DeflateStream zipStream = new DeflateStream(oStream, CompressionMode.Compress);
zipStream.Write(bytes, 0, bytes.Length);
zipStream.Flush();
zipStream.Close();
return oStream.ToArray();
}

public static object DecompressionObject(byte[] bytes)
{
if (bytes == null) return null;
MemoryStream mStream = new MemoryStream(bytes);
mStream.Seek(0, SeekOrigin.Begin);
DeflateStream unZipStream = new DeflateStream(mStream, CompressionMode.Decompress, true);
object dsResult = null;
BinaryFormatter bFormatter = new BinaryFormatter();
dsResult = (object)bFormatter.Deserialize(unZipStream);
return dsResult;
}
#endregion