SYSK 82: Compression Example in .NET
As many of you may know, .NET framework 2.0 contains a built in support for compressing the file or any generic stream such as FileStream, MemoryStream, TextWriter, XmlWriter, NetworkStream, etc
So, now, you can compress/decompress using GZip algorithm natively in .NET. The code below is an example of compressing/decompressing a file. To run it, create a C# Windows Application project, add a button to your form and create source.txt file with some text (e.g. Hello, World!) in c:\temp\compression folder.
private void button1_Click(object sender, EventArgs e)
{
Compress(@"c:\temp\compression\source.txt", @"c:\temp\compression\compressed.txt");
DeCompress(@"c:\temp\compression\compressed.txt", @"c:\temp\compression\result.txt");
}
private void Compress(string source, string destination)
{
using (System.IO.FileStream sourceStream = System.IO.File.OpenRead(source))
{
using (System.IO.FileStream destinationStream = System.IO.File.OpenWrite(destination))
{
using (System.IO.Compression.GZipStream compressedStream = new System.IO.Compression.GZipStream(destinationStream, System.IO.Compression.CompressionMode.Compress))
{
byte[] data = new byte[sourceStream.Length];
sourceStream.Read(data, 0, data.Length);
compressedStream.Write(data, 0, data.Length);
}
}
}
}
private void DeCompress(string source, string destination)
{
using (System.IO.FileStream sourceStream = System.IO.File.OpenRead(source))
{
using (System.IO.FileStream destinationStream = System.IO.File.OpenWrite(destination))
{
using (System.IO.Compression.GZipStream decompressedStream = new System.IO.Compression.GZipStream(sourceStream, System.IO.Compression.CompressionMode.Decompress))
{
// Note: decompressedStream.Length is not supported => results in runtime exception
int data;
while ((data = decompressedStream.ReadByte()) != -1)
destinationStream.WriteByte((byte)data);
}
}
}
}
