New-IsoFile.ps1

New-IsoFile.ps1

#
# New-IsoFile: simple PowerShell function to create iso file from a directory
#
# This is heavily simplified code inspired from:
# https://blog.apps.id.au/powershell-tools-create-an-iso/
# http://blogs.msdn.com/b/opticalstorage/archive/2010/08/13/writing-optical-discs-using-imapi-2-in-powershell.aspx
# http://tools.start-automating.com/Install-ExportISOCommand/
# http://stackoverflow.com/a/9802807/223837

function New-IsoFile
{
    [CmdletBinding()]
	param(
        [Parameter(Mandatory=$true,Position=0)]
        [string] $Path,
        [Parameter(Mandatory=$true,Position=1)]
        [string] $Destination,
        [Parameter(Mandatory=$true)]
        [string] $VolumeName,
        [switch] $IncludeRoot,
        [switch] $Force
    )

    # http://msdn.microsoft.com/en-us/library/windows/desktop/aa364840.aspx
    $fsi = New-Object -ComObject IMAPI2FS.MsftFileSystemImage
    $fsi.FileSystemsToCreate = 4 # FsiFileSystemUDF
    $fsi.FreeMediaBlocks = 0
    $fsi.VolumeName = $VolumeName
    $fsi.Root.AddTree($Path, $IncludeRoot)
    $istream = $fsi.CreateResultImage().ImageStream

    $Options = if ($PSEdition -eq 'Core') {
        @{ CompilerOptions = "/unsafe" }
    } else {
        $cp = New-Object CodeDom.Compiler.CompilerParameters
        $cp.CompilerOptions = "/unsafe"
        $cp.WarningLevel = 4
        $cp.TreatWarningsAsErrors = $true
        @{ CompilerParameters = $cp }
    }

    Add-Type @Options -TypeDefinition @"
using System;
using System.IO;
using System.Runtime.InteropServices.ComTypes;

namespace IsoHelper {
    public static class FileUtil {
        public static void WriteIStreamToFile(object i, string fileName) {
            IStream inputStream = i as IStream;
            FileStream outputFileStream = File.OpenWrite(fileName);
            int bytesRead = 0;
            int offset = 0;
            byte[] data;
            do {
                data = Read(inputStream, 2048, out bytesRead);
                outputFileStream.Write(data, 0, bytesRead);
                offset += bytesRead;
            } while (bytesRead == 2048);
            outputFileStream.Flush();
            outputFileStream.Close();
        }

        unsafe static private byte[] Read(IStream stream, int toRead, out int read) {
            byte[] buffer = new byte[toRead];
            int bytesRead = 0;
            int* ptr = &bytesRead;
            stream.Read(buffer, toRead, (IntPtr)ptr);
            read = bytesRead;
            return buffer;
        }
    }
}
"@

    [IsoHelper.FileUtil]::WriteIStreamToFile($istream, $Destination)
}