public/ConvertFrom-Base64.ps1
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function ConvertFrom-Base64 { <# .SYNOPSIS Convert string from Base64 to ASCII .DESCRIPTION Convert string to Base64 string to ASCII string .PARAMETER String Required. Base64 encoded string value to be converted. .PARAMETER Compressed Optional. Decode from compressed source .EXAMPLE "H4sIAAAAAAAEACvJyCxWAKJEhZLU4hKF4pKizLx0ALXWhvwVAAAA" | ConvertFrom-Base64 returns: "this is a test string" .LINK https://github.com/Skatterbrainz/helium/blob/master/docs/ConvertFrom-Base64.md #> [CmdletBinding()] param ( [parameter(Mandatory=$true,ValueFromPipeline=$true,HelpMessage="Base64 Encoded String")][ValidateNotNullOrEmpty()]$String, [parameter(HelpMessage="Convert using compressed stream")][switch]$Compressed ) begin {} process { if ($Compressed) { $data = [System.Convert]::FromBase64String($String) $compressedStream = [System.IO.MemoryStream]::new($data) $zipStream = [System.IO.Compression.GZipStream]::new($compressedStream, [System.IO.Compression.CompressionMode]::Decompress) $resultStream = [System.IO.MemoryStream]::new() $buffer = [System.Byte[]]::CreateInstance([System.Byte],4096) while (($read = $zipStream.Read($buffer, 0, $buffer.Length)) -gt 0){ $resultStream.Write($buffer, 0, $read) } $decompressed = $resultStream.ToArray() [System.Text.Encoding]::UTF8.GetString($decompressed, 0, $decompressed.Length) } else { [System.Text.Encoding]::Unicode.GetString([System.Convert]::FromBase64String($String)) } } end {} } |