Functions/ConvertFrom-Base64.ps1
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# Copyright 2012 Aaron Jensen # # 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. function ConvertFrom-Base64 { <# .SYNOPSIS Converts a base-64 encoded string back into its original string. .DESCRIPTION For some reason. .NET makes encoding a string a two-step process. This function makes it a one-step process. You're actually allowed to pass in `$null` and an empty string. If you do, you'll get `$null` and an empty string back. .LINK ConvertTo-Base64 .EXAMPLE ConvertFrom-Base64 -Value 'RW5jb2RlIG1lLCBwbGVhc2Uh' Decodes `RW5jb2RlIG1lLCBwbGVhc2Uh` back into its original string. .EXAMPLE ConvertFrom-Base64 -Value 'RW5jb2RlIG1lLCBwbGVhc2Uh' -Encoding ([Text.Encoding]::ASCII) Shows how to specify a custom encoding in case your string isn't in Unicode text encoding. .EXAMPLE 'RW5jb2RlIG1lIQ==' | ConvertTo-Base64 Shows how you can pipeline input into `ConvertFrom-Base64`. #> [CmdletBinding()] param( [Parameter(Mandatory=$true,ValueFromPipeline=$true)] [AllowNull()] [AllowEmptyString()] [string[]] # The base-64 string to convert. $Value, [Text.Encoding] # The encoding to use. Default is Unicode. $Encoding = ([Text.Encoding]::Unicode) ) begin { Set-StrictMode -Version 'Latest' Use-CallerPreference -Cmdlet $PSCmdlet -Session $ExecutionContext.SessionState } process { $Value | ForEach-Object { if( $_ -eq $null ) { return $null } $bytes = [Convert]::FromBase64String($_) $Encoding.GetString($bytes) } } } |