Compressing Decompressing files using Asp.Net 2.0/C# GZipStream

Posted by on March 23, 2010 Leave a comment (0) Go to comments

Introduction:
In this article i am going to express about how to compress/decompress files using Asp.Net 2.0

Main:
In Asp.Net 2.0 we have a new feature for compressing and decompressing files is called GZIPSTREAM classes.These classes
are coming under System.IO.Compression namespace.

For Compressing Files:

FileStream local_fs = new FileStream("C:\\Sample.txt", FileMode.Open);
byte[] local_input = new byte[local_fs.Length];
local_fs.Read(local_input, 0, local_input.Length);
local_fs.Close();
 
FileStream local_fsopt = new FileStream("C:\\Sample.txt",
                                     FileMode.Create,
                                     FileAccess.Write);
GZipStream local_zip = new GZipStream(local_fsopt, CompressionMode.Compress);
 
zip.Write(input, 0, input.Length);
zip.Close();
local_fsopt.Close();

For Decompressing Files:

FileStream local_fs = new FileStream("C:\\Sample.txt", FileMode.Open);
FileStream local_fsopt = new FileStream("C:\\Sample.txt",
                                     FileMode.Create,
                                     FileAccess.Write);
GZipStream local_zip = new GZipStream(local_fs, CompressionMode.Decompress, true);
 
byte[] local_buffer = new byte[4096];
int local_bytesRead;
bool local_continueLoop = true;
while (local_continueLoop)
{
   local_bytesRead = local_zip.Read(local_buffer, 0, local_buffer.Length);
   if (local_bytesRead == 0)
      break;
   local_fsopt.Write(local_buffer, 0, local_bytesRead);
}
local_zip.Close();
local_fsopt.Close();
local_fs.Close();