ConvertFrom-Base64.ps1

function ConvertFrom-Base64 {
<#
.SYNOPSIS

Decodes a BASE64 encoded string.

.DESCRIPTION

Decodes a BASE64 encoded string.

Input can be either a positional or named parameters of type string or an 
array of strings. The Cmdlet accepts pipeline input.

.EXAMPLE

ConvertFrom-Base64 VGhpcyBpcyBhbiBlbmNvZGVkIHN0cmluZy4=
This is an encoded string.

Encoded string is passed as a positional parameter to the Cmdlet.


.EXAMPLE

ConvertFrom-Base64 -InputObject VGhpcyBpcyBhbiBlbmNvZGVkIHN0cmluZy4=
This is an encoded string.

Encoded string is passed as a named parameter to the Cmdlet.


.EXAMPLE

ConvertFrom-Base64 -InputObject VGhpcyBpcyBhbiBlbmNvZGVkIHN0cmluZy4=, VGhpcyBpcyBhbiBhbm90aGVyIGVuY29kZWQgc3RyaW5nLg==
This is an encoded string.
This is an another encoded string.

Encoded strings are passed as an implicit array to the Cmdlet.


.EXAMPLE

ConvertFrom-Base64 -InputObject @("VGhpcyBpcyBhbiBlbmNvZGVkIHN0cmluZy4=", "VGhpcyBpcyBhbiBhbm90aGVyIGVuY29kZWQgc3RyaW5nLg==")
This is an encoded string.
This is an another encoded string.

Encoded strings are passed as an explicit array to the Cmdlet.


.EXAMPLE

@("VGhpcyBpcyBhbiBlbmNvZGVkIHN0cmluZy4=", "VGhpcyBpcyBhbiBhbm90aGVyIGVuY29kZWQgc3RyaW5nLg==") | ConvertFrom-Base64
This is an encoded string.
This is an another encoded string.

Encoded strings are piped as an explicit array to the Cmdlet.


.EXAMPLE

"VGhpcyBpcyBhbiBhbm90aGVyIGVuY29kZWQgc3RyaW5nLg==" | ConvertFrom-Base64
This is an another encoded string.

Encoded string is piped to the Cmdlet.


.EXAMPLE

$r = @("VGhpcyBpcyBhbiBlbmNvZGVkIHN0cmluZy4=", 0, "VGhpcyBpcyBhbiBhbm90aGVyIGVuY29kZWQgc3RyaW5nLg==") | ConvertFrom-Base64
Exception calling "FromBase64String" with "1" argument(s): "Invalid length for a Base-64 char array or string."
At C:\PSModules\biz.dfch.PS.System.Utilities\ConvertFrom-Base64.ps1:45 char:3
+         $OutputParameter = [System.Text.Encoding]::UTF8.GetString([System.Convert]::Fr ...
+    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [], MethodInvocationException
    + FullyQualifiedErrorId : FormatException

$r
This is an encoded string.
This is an another encoded string.

In case one of the passed strings is not a valid BASE64 encoded string, an 
exception is thrown. The pipeline will continue to execute and all valid 
strings are returned.


.LINK

Online Version: http://dfch.biz/biz/dfch/PS/System/Utilities/ConvertFrom-Base64/



.NOTES

See module manifest for required software versions and dependencies at: 
http://dfch.biz/biz/dfch/PS/System/Utilities/biz.dfch.PS.System.Utilities.psd1/


#>

[CmdletBinding(
    SupportsShouldProcess = $true
	,
    ConfirmImpact = "Low"
	,
	HelpURI = 'http://dfch.biz/biz/dfch/PS/System/Utilities/ConvertFrom-Base64/'
)]
[OutputType([string])]

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

BEGIN 
{
	$datBegin = [datetime]::Now;
	[string] $fn = $MyInvocation.MyCommand.Name;
	$OutputParameter = $null;
	Log-Debug -fn $fn -msg ("CALL. InputObject.Count: '{0}'" -f $InputObject.Count) -fac 1;
}

PROCESS 
{
	foreach($Object in $InputObject) 
	{
		if(!$PSCmdlet.ShouldProcess($Object))
		{
			continue;
		}
		$fReturn = $false;
		$OutputParameter = $null;

		$OutputParameter = [System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String($Object.ToString()));
		$OutputParameter;
	}
	$fReturn = $true;
}

END 
{
	$datEnd = [datetime]::Now;
	Log-Debug -fn $fn -msg ("RET. fReturn: [{0}]. Execution time: [{1}]ms. Started: [{2}]." -f $fReturn, ($datEnd - $datBegin).TotalMilliseconds, $datBegin.ToString('yyyy-MM-dd HH:mm:ss.fffzzz')) -fac 2;
}

} # function
if($MyInvocation.ScriptName) { Export-ModuleMember -Function ConvertFrom-Base64; } 

#
# Copyright 2013-2015 d-fens GmbH
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#

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