File Zip in native PowerShell with .NET 3.0

ziptool.ps1

<#
.SYNOPSIS
Author: Rich Warren

Based on original c# code by Jon Galloway:

https://weblogs.asp.net/jongalloway/creating-zip-archives-in-net-without-an-external-library-like-sharpziplib

.DESCRIPTION
Tool for creating a Zip file in native Powershell with .NET 3.0 only.
You could always do this in PowerShell + .NET 4.5 with System.IO.Compression, but nothing worked for .NET 3.0/3.5.

.EXAMPLE
# Zip up a directory
CreateZipFromDirectory -ZipDir "c:\temp\files" -ZipFile "c:\temp\files.zip"

.EXAMPLE
# Create a zip file from a single input file
CreateZipFromFile -InputFile "c:\temp\files\test.txt" -ZipFile "c:\temp\files.zip"

.EXAMPLE
# Same as above, but multiple files..
$myfiles = @("c:\temp\test.txt","C:\windows\system32\calc.exe","C:\windows\system32\notepad.exe")
Foreach ($file in $myfiles){
	CreateZipFromFile -InputFile $file -ZipFile "c:\temp\myfiles.zip"
}

#>

# Load WindowsBase.dll
[Reflection.Assembly]::LoadFile("c:\Program Files\Reference Assemblies\Microsoft\Framework\v3.0\WindowsBase.dll")

Function CreateZipFromDirectory{
	Param
	(
		[Parameter(Mandatory=$true)]
		[string]$ZipDir,
		[Parameter(Mandatory=$true)]
		[string]$ZipFile
	)

	$zipper = [System.IO.Packaging.Package]::Open($ZipFile, [System.IO.FileMode]::OpenOrCreate)

	$files = Get-ChildItem $ZipDir
	Foreach ($file in $files) {
		AddFileToZip -ZipFile $zipper -AddFile $file.FullName
	}

	$zipper.close()
}

Function CreateZipFromFile{
	Param
	(
		[Parameter(Mandatory=$true)]
		[string]$InputFile,
		[Parameter(Mandatory=$true)]
		[string]$ZipFile
	)

	$zipper = [System.IO.Packaging.Package]::Open($ZipFile, [System.IO.FileMode]::OpenOrCreate)
	AddFileToZip -ZipFile $zipper -AddFile $InputFile
	$zipper.close()
}


Function AddFileToZip{

	Param
	(
		[Parameter(Mandatory=$true)]
		[System.IO.Packaging.Package]$ZipFile,
		[Parameter(Mandatory=$true)]
		[string]$AddFile
	)
	
	$destFilename = [System.IO.Path]::GetFileName($AddFile)
	$uri = [System.IO.Packaging.PackUriHelper]::CreatePartUri($destFilename)
	
	if ($ZipFile.PartExists($uri)){
		$ZipFile.DeletePart($uri)
	}

	$part = $ZipFile.CreatePart($uri, "", [System.IO.Packaging.CompressionOption]::Normal)
	$InputStream = new-object IO.FileStream $AddFile, 'Open', 'Read'
	$OutputStream = $part.GetStream()
	
	$bufferSize = $InputStream.Length
	$buffer = New-Object Byte[] $bufferSize
	$bytesRead = 0;
	$bytesWritten = 0;
	while (($bytesRead = $InputStream.Read($buffer, 0, $buffer.Length)) -ne 0)
	{
		$OutputStream.Write($buffer, 0, $bytesRead);
		$bytesWritten += $bufferSize;
	}
	Write-Host "Bytes written: $bytesWritten"
}