Public/ConvertTo-IPv4MaskBit.ps1
|
function ConvertTo-IPv4MaskBit { <# .SYNOPSIS Returns the number of bits (0-32) in a network mask string (e.g., "255.255.255.0"). .DESCRIPTION Returns the number of bits (0-32) in a network mask string (e.g., "255.255.255.0"). .PARAMETER MaskString Specifies the IPv4 network mask string (e.g., "255.255.255.0"). #> [CmdletBinding(ConfirmImpact = 'Medium')] [OutputType([System.Int32])] Param ( [Parameter(Mandatory = $false, ValueFromPipeline = $true, ValueFromPipelineByPropertyName = $true, ValueFromRemainingArguments = $false, Position = 1)] [ValidateScript({Test-IPv4MaskString $_})] [String] $MaskString ) Begin { Write-Verbose -Message '|=> ************************************************************************ <=|' Write-Verbose -Message (Get-Date).ToShortDateString() Write-Verbose -Message (' Starting: {0}' -f $MyInvocation.Mycommand) #display PSBoundparameters formatted nicely for Verbose output $NL = "`n" # New Line $HTab = "`t" # Horizontal Tab [string]$pb = ($PSBoundParameters | Format-Table -AutoSize | Out-String).TrimEnd() Write-Verbose -Message "Parameters used by the function... $NL$($pb.split($NL).Foreach({"$($HTab*4)$_"}) | Out-String) $NL" } Process { $mask = ([IPAddress] $MaskString).Address for ( $bitCount = 0; $mask -ne 0; $bitCount++ ) { $mask = $mask -band ($mask - 1) } $bitCount } End { Write-Verbose -Message ('Function {0} finished.' -f $MyInvocation.InvocationName) Write-Verbose -Message '' Write-Verbose -Message '-------------------------------------------------------------------------------' Write-Verbose -Message '' } } |