using System;

using System.IO;

using System.IO.Compression;

namespace zip

{

    public class Program

    {

        public static void Main()

        {

            // Path to directory of files to compress and decompress.

            string dirpath = @"c:\users\public\reports";

            DirectoryInfo di = new DirectoryInfo(dirpath);

            // Compress the directory's files.

            foreach (FileInfo fi in di.GetFiles())

            {

                Compress(fi);

            }

            // Decompress all *.gz files in the directory.

            foreach (FileInfo fi in di.GetFiles("*.gz"))

            {

                Decompress(fi);

            }

        }

        public static void Compress(FileInfo fi)

        {

            // Get the stream of the source file.

            using (FileStream inFile = fi.OpenRead())

            {

                // Prevent compressing hidden and

                // already compressed files.

                if ((File.GetAttributes(fi.FullName)

                    & FileAttributes.Hidden)

                    != FileAttributes.Hidden & fi.Extension != ".gz")

                {

                    // Create the compressed file.

                    using (FileStream outFile =

                                File.Create(fi.FullName + ".gz"))

                    {

                        using (GZipStream Compress =

                            new GZipStream(outFile,

                            CompressionMode.Compress))

                        {

                            // Copy the source file into

                            // the compression stream.

                        inFile.CopyTo(Compress);

                            Console.WriteLine("Compressed {0} from {1} to {2} bytes.",

                                fi.Name, fi.Length.ToString(), outFile.Length.ToString());

                        }

                    }

                }

            }

        }

        public static void Decompress(FileInfo fi)

        {

            // Get the stream of the source file.

            using (FileStream inFile = fi.OpenRead())

            {

                // Get original file extension, for example

                // "doc" from report.doc.gz.

                string curFile = fi.FullName;

                string origName = curFile.Remove(curFile.Length -

                        fi.Extension.Length);

                //Create the decompressed file.

                using (FileStream outFile = File.Create(origName))

                {

                    using (GZipStream Decompress = new GZipStream(inFile,

                            CompressionMode.Decompress))

                    {

                        // Copy the decompression stream

                        // into the output file.

                        Decompress.CopyTo(outFile);

                        Console.WriteLine("Decompressed: {0}", fi.Name);

                    }

                }

            }

        }

    }

}