Powershell to decompress DEFLATE data

decompress.ps1

$base64data = "insert compressed and base64 data here"
$data = [System.Convert]::FromBase64String($base64data)
$ms = New-Object System.IO.MemoryStream
$ms.Write($data, 0, $data.Length)
$ms.Seek(0,0) | Out-Null

$sr = New-Object System.IO.StreamReader(New-Object System.IO.Compression.DeflateStream($ms, [System.IO.Compression.CompressionMode]::Decompress))

while ($line = $sr.ReadLine()) {  
    $line
}

Thanks @Luiz-Monad , this helped me a lot !

Why this script return error, like below?

Exception calling "ReadLine" with "0" argument(s): "Block length does not match with its complement."

What format of data should I use or how to get sample data? I tried to create taht sample, using the extension in Chrome "Zlib Compressor" and getting that error like above.
I'm using powershell 5x
Thanks for help

Why this script return error, like below?

Exception calling "ReadLine" with "0" argument(s): "Block length does not match with its complement."

What format of data should I use or how to get sample data? I tried to create taht sample, using the extension in Chrome "Zlib Compressor" and getting that error like above. I'm using powershell 5x Thanks for help

That's because you're trying to decompress data compressed in another format like gzip or not compressed.
This is how you use it

# create the stream

$data1 = "this is what goes`nanother line"
$data2 = "more lines"

$msw = New-Object System.IO.MemoryStream
$sw = New-Object System.IO.StreamWriter(New-Object System.IO.Compression.DeflateStream($msw, [System.IO.Compression.CompressionMode]::Compress))
$sw.WriteLine($data1)
$sw.Write($data2)
$sw.Close()

# this is binary compressed data
$data = $msw.ToArray()

# deflate the stream
$ms = New-Object System.IO.MemoryStream
$ms.Write($data, 0, $data.Length)
$ms.Seek(0,0) | Out-Null

$sr = New-Object System.IO.StreamReader(New-Object System.IO.Compression.DeflateStream($ms, [System.IO.Compression.CompressionMode]::Decompress))

while ($line = $sr.ReadLine()) {  
    $line
}
#outputs
# this is what goes
# another line
# more lines

also, if you are trying to decompress things compressed by zlib, you probably want to use ZLibStream instead of DeflateStream. Now, if you're trying to decompress an actual ZipFile, the process is different, those are for bare streams.

Thank you @Luiz-Monad, this helped me a lot and works now.
Have a great day!