Imports System.IO
Imports System.IO.Compression
Module Module1
Sub Main()
' Path to directory of files to compress.
Dim dirpath As String = "c:\users\public\reports"
Dim di As DirectoryInfo = New DirectoryInfo(dirpath)
' Compress the directory's files.
For Each fi As FileInfo In di.GetFiles()
Compress(fi)
Next
' Decompress all *.gz files in the directory.
For Each fi As FileInfo In di.GetFiles("*.gz")
Decompress(fi)
Next
End Sub
' Method to compress.
Private Sub Compress(ByVal fi As FileInfo)
' Get the stream of the source file.
Using inFile As FileStream = fi.OpenRead()
' Compressing:
' Prevent compressing hidden and already compressed files.
If (File.GetAttributes(fi.FullName) And FileAttributes.Hidden) _
<> FileAttributes.Hidden And fi.Extension <> ".gz" Then
' Create the compressed file.
Using outFile As FileStream = File.Create(fi.FullName + ".gz")
Using Compress As GZipStream = New GZipStream(outFile, CompressionMode.Compress)
' Copy the source file into the compression stream.
Dim buffer As Byte() = New Byte(4096) {}
Dim numRead As Integer
numRead = inFile.Read(buffer, 0, buffer.Length)
Do While numRead <> 0
Compress.Write(buffer, 0, numRead)
numRead = inFile.Read(buffer, 0, buffer.Length)
Loop
Console.WriteLine("Compressed {0} from {1} to {2} bytes.", _
fi.Name, fi.Length.ToString(), outFile.Length.ToString())
End Using
End Using
End If
End Using
End Sub
' Method to decompress.
Private Sub Decompress(ByVal fi As FileInfo)
' Get the stream of the source file.
Using inFile As FileStream = fi.OpenRead()
' Get orignial file extension, for example "doc" from report.doc.gz.
Dim curFile As String = fi.FullName
Dim origName = curFile.Remove(curFile.Length - fi.Extension.Length)
' Create the decompressed file.
Using outFile As FileStream = File.Create(origName)
Using Decompress As GZipStream = New GZipStream(inFile, CompressionMode.Decompress)
' Copy the compressed file into the decompression stream.
Dim buffer As Byte() = New Byte(4096) {}
Dim numRead As Integer
numRead = Decompress.Read(buffer, 0, buffer.Length)
Do While numRead <> 0
outFile.Write(buffer, 0, numRead)
numRead = Decompress.Read(buffer, 0, buffer.Length)
Loop
Console.WriteLine("Decompressed: {0}", fi.Name)
End Using
End Using
End Using
End Sub
End Module