Powershell Subnetting Functions

<#
    .NOTES
    ===========================================================================
     Created with:  Windows PowerShell ISE
     Created on:    7/7/2015 10:34 PM
     Created by:    David Septimus
    ===========================================================================
    .DESCRIPTION
        Functions for validating subnet and wildcard masks.
        Both functions return a boolean value if the input string is valid or nothing if the string is invalid.
#>

function Validate-SubnetMask
{
    param (
        [cmdletbinding()]
        [string]$Mask
    )
    $stringMask = $i = $validAddress = $null
    if ([System.Net.IPAddress]::TryParse($Mask, [ref]$validAddress))
    {

        $validAddress = $validAddress.GetAddressBytes()
        $validAddress |
        %{
            $i++
            [string]$stringMask += [convert]::ToString([int32]$_, 2).PadLeft(8,'0')
        }
        for ($i = 0; $i -lt $stringMask.Length ; $i++)
        {
            if ($stringMask[$i] -ne $null)
            {
                if ($i -eq 0 -and [int32]::Parse($stringMask[$i]) -eq 0)
                {
                    break
                }
                elseif ($i -gt 0 -and (([int32]::Parse($stringMask[$i - 1]) -eq 0) -and ([int32]::Parse($stringMask[$i]) -eq 1)))
                {
                    Write-Output $false
                    break
                }
            }
            if ($i -eq $stringMask.Length-1)
            {
                Write-Output $true
                break
            }
        }
    }
}

function Validate-WildcardMask
{
    param (
        [cmdletbinding()]
        [string]$Mask
    )
    $validAddress = $null
    if ([System.Net.IPAddress]::TryParse($Mask, [ref]$validAddress))
    {
        #reverse the input string
        $validAddress = ($validAddress.IPAddressToString).Split("`.")
        [array]::Reverse($validAddress)
        $reversedMask = $validAddress -join '.'

        $validAddress = [System.Net.IPAddress]::Parse([string]$reversedMask)


        #validate the reversed mask
        $stringMask = $i = $null
        $validAddress = $validAddress.GetAddressBytes()
        $validAddress |
        %{
            $i++
            [string]$stringMask += [convert]::ToString([int32]$_, 2).PadLeft(8,'0')
        }
        for ($i = 0; $i -lt $stringMask.Length ; $i++)
        {
            if ($stringMask[$i] -ne $null)
            {
                if ($i -eq 0 -and [int32]::Parse($stringMask[$i]) -eq 0)
                {
                    break
                }
                elseif ($i -gt 0 -and (([int32]::Parse($stringMask[$i - 1]) -eq 0) -and ([int32]::Parse($stringMask[$i]) -eq 1)))
                {
                    Write-Output $false
                    break
                }
            }
            if ($i -eq $stringMask.Length-1)
            {
                Write-Output $true
                break
            }
        }
    }
}