MSIdentityTools

1.1.4

ConvertFrom-HexString.ps1

                                <#

.SYNOPSIS

   Convert from Hex String

.DESCRIPTION

.EXAMPLE

    PS C:\>ConvertFrom-HexString "57 68 61 74 20 69 73 20 61 20 68 65 78 20 73 74 72 69 6E 67 3F"

    Convert string to hex byte string seperated by spaces.

.EXAMPLE

    PS C:\>"415343494920737472696E6720746F2068657820737472696E67" | ConvertFrom-HexString -Delimiter "" -Encoding Ascii

    Convert ASCII string to hex byte string with no seperation.

.INPUTS

    System.String

#>

function ConvertFrom-HexString {

    [CmdletBinding()]

    param (

        # Value to convert

        [Parameter(Mandatory=$true, Position=0, ValueFromPipeline=$true)]

        [string[]] $InputObject,

        # Delimiter between Hex pairs

        [Parameter (Mandatory=$false)]

        [string] $Delimiter = ' ',

        # Output raw byte array

        [Parameter (Mandatory=$false)]

        [switch] $RawBytes,

        # Encoding to use for text strings

        [Parameter (Mandatory=$false)]

        [ValidateSet('Ascii', 'UTF32', 'UTF7', 'UTF8', 'BigEndianUnicode', 'Unicode')]

        [string] $Encoding = 'Default'

    )

    process

    {

        $listBytes = New-Object object[] $InputObject.Count

        for ($iString = 0; $iString -lt $InputObject.Count; $iString++) {

            [string] $strHex = $InputObject[$iString]

            if ($strHex.Substring(2,1) -eq $Delimiter) {

                [string[]] $listHex = $strHex -split $Delimiter

            }

            else {

                [string[]] $listHex = New-Object string[] ($strHex.Length/2)

                for ($iByte = 0; $iByte -lt $strHex.Length; $iByte += 2) {

                    $listHex[[System.Math]::Truncate($iByte/2)] = $strHex.Substring($iByte, 2)

                }

            }

            [byte[]] $outBytes = New-Object byte[] $listHex.Count

            for ($iByte = 0; $iByte -lt $listHex.Count; $iByte++)

            {

                $outBytes[$iByte] = [byte]::Parse($listHex[$iByte],[System.Globalization.NumberStyles]::HexNumber)

            }

            if ($RawBytes) { $listBytes[$iString] = $outBytes }

            else {

                $outString = ([Text.Encoding]::$Encoding.GetString($outBytes))

                Write-Output $outString

            }

        }

        if ($RawBytes) {

            return $listBytes

        }

    }

}

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# SIG # End signature block