# Example working code to decompress a file with an extension of "tar.gz". ie Uncompress (expand) a sample
# file such as: filename.tar.gz.

# Admittedly, there are better ways of writing this code more succinctly but using the layout given, it will
# remind me of how this task is done. I don't expand 'tar.gz' files very often so I needed a writing style
# which would be a good reminder of how to do this in the future.

#
$srcfile = 'C:\Test\filename.tar.gz';
$destfile = 'C:\Test\sampledata.dat';

$path = $srcfile;
$mode = [System.IO.FileMode]::Open;
$access = [System.IO.FileAccess]::Read;
$share = [System.IO.FileShare]::Read;
$fis = New-Object -typeName 'System.IO.FileStream' -ArgumentList `
       $path, $mode, $access, $share;

$path = $destfile;
$mode = [System.IO.FileMode]::Create;
$access = [System.IO.FileAccess]::Write;
$share = [System.IO.FileShare]::None;
$fos = New-Object -typeName 'System.IO.FileStream' -ArgumentList `
       $path, $mode, $access, $share;

$stream = $fis;
$mode = [System.IO.Compression.CompressionMode]::Decompress;
$gzipStream = New-Object -typeName 'System.IO.Compression.GzipStream' -ArgumentList `
              $stream, $mode;

$databuffer = New-Object Byte[] 4KB;
$bytesRead = -1;

do {
    $bytesRead = $gzipstream.Read($databuffer, 0, $databuffer.Length)
    $fos.Write($databuffer, 0, $bytesRead)
} while ($bytesRead -gt 0)

$gzipStream.Dispose();
$fos.Dispose();
$fis.Dispose();

# Have a quick look at the files we've been dealing with.
Get-ChildItem $srcfile, $destfile;