Created
September 18, 2024 03:16
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| param ( | |
| [string]$DesktopDeploymentCab, | |
| [string]$PsfFile, | |
| [string]$OutPath, | |
| [switch]$Verbose = $false | |
| ) | |
| mkdir -Force $OutPath | Out-Null | |
| $OutPath = Resolve-Path $OutPath | |
| $oldpath = $env:PATH | |
| $env:PATH = $env:PATH + ";$OutPath" | |
| $deltadll = "UpdateCompression.dll" | |
| $ucpath = (Join-Path $OutPath $deltadll) | |
| if (-not (Test-Path $ucpath)) { | |
| # we need to get and import UpdateCompression | |
| if ($null -ne $DesktopDeploymentCab) { | |
| expand -F:UpdateCompression.dll $ddcab $OutPath | Out-Null | |
| } | |
| if (-not (Test-Path $ucpath)) { | |
| $uri = "https://msdl.microsoft.com/download/symbols/updatecompression.dll/2F47410A82000/updatecompression.dll" | |
| Write-Warning "UpdateCompression.dll was not present in $DesktopDeploymentCab" | |
| Write-Host "Downloading a copy from $uri" | |
| Invoke-WebRequest -UseBasicParsing -Uri $uri -OutFile $ucpath | |
| } | |
| } | |
| try { [FFI.UpdateCompression] | Out-Null } catch { | |
| Add-Type -Name UpdateCompression -Namespace FFI -MemberDefinition @" | |
| [StructLayout(LayoutKind.Sequential)] | |
| public struct DELTA_INPUT { | |
| public IntPtr lpcStart; | |
| public IntPtr uSize; | |
| public int Editable; | |
| } | |
| [StructLayout(LayoutKind.Sequential)] | |
| public struct DELTA_OUTPUT { | |
| public IntPtr lpStart; | |
| public IntPtr uSize; | |
| } | |
| [DllImport("$deltadll", SetLastError=true)] | |
| public static extern bool ApplyDeltaB( | |
| int ApplyFlags, | |
| ref DELTA_INPUT Source, | |
| ref DELTA_INPUT Delta, | |
| ref DELTA_OUTPUT lpTarget | |
| ); | |
| [DllImport("$deltadll")] | |
| public static extern bool DeltaFree(IntPtr Buffer); | |
| "@ | |
| } | |
| # get the manifest delta from the PSF file | |
| $psf = [IO.File]::OpenRead((Resolve-Path $psffile)) | |
| $psf.Seek(4, [IO.SeekOrigin]::Begin) | Out-Null | |
| $psfreader = [IO.BinaryReader]$psf | |
| $manifest_len = [bitconverter]::ToUInt32($psfreader.ReadBytes(4), 0) | |
| # skip PSTREAM header, read the PA30 delta | |
| $psf.Seek(0x80, [IO.SeekOrigin]::Begin) | Out-Null | |
| $manifest_delta = $psfreader.ReadBytes($manifest_len) | |
| $md_buffer = [Runtime.InteropServices.Marshal]::AllocHGlobal($manifest_len) | |
| [Runtime.InteropServices.Marshal]::Copy($manifest_delta, 0, $md_buffer, $manifest_len) | Out-Null | |
| # expand the manifest | |
| $Source = New-Object FFI.UpdateCompression+DELTA_INPUT | |
| $Delta = New-Object FFI.UpdateCompression+DELTA_INPUT | |
| $Target = New-Object FFI.UpdateCompression+DELTA_OUTPUT | |
| $Source.lpcStart = [IntPtr]::Zero | |
| $Source.uSize = [IntPtr]::Zero | |
| $Delta.lpcStart = $md_buffer | |
| $Delta.uSize = [IntPtr]$manifest_len | |
| $res = [FFI.UpdateCompression]::ApplyDeltaB( | |
| 0, | |
| [ref]$Source, | |
| [ref]$Delta, | |
| [ref]$Target | |
| ) | |
| # dll was loaded, can restore path | |
| $env:PATH = $oldpath | |
| [Runtime.InteropServices.Marshal]::FreeHGlobal($md_buffer) | Out-Null | |
| if ($res -eq 0) { | |
| Write-Error "ApplyDeltaB failed to expand the PSF metadata" | |
| return | |
| } | |
| # create the manifest from the output bytes | |
| $buf = [byte[]]::new($Target.uSize) | |
| [Runtime.InteropServices.Marshal]::Copy($Target.lpStart, $buf, 0, $Target.uSize) | Out-Null | |
| [FFI.UpdateCompression]::DeltaFree($Target.lpStart) | Out-Null | |
| $xml = [xml]([Text.Encoding]::UTF8.GetString($buf)) | |
| if ($xml.Container.type -ne "PSF") { | |
| Write-Error "Invalid PSF manifest XML" | |
| return | |
| } | |
| # unpack the patch! | |
| Write-Host "Manifest expanded. Unpacking patch" | |
| $hasher = [Security.Cryptography.HashAlgorithm]::Create("sha256") | |
| $tot = $xml.Container.Files.ChildNodes.Count | |
| $n = 0 | |
| $xml.Container.Files.ChildNodes | ForEach-Object { | |
| $offset = [int]$_.Delta.Source.offset | |
| $length = [int]$_.Delta.Source.length | |
| $expectedhash = $_.Delta.Source.Hash.value.ToUpper() | |
| $fn = $_.name | |
| Write-Progress -PercentComplete ($n/$tot*100) -Status "Unpacking patch $PsfFile" -Activity "$fn" | |
| $psf.Seek($offset, [IO.SeekOrigin]::Begin) | Out-Null | |
| $patch = $psfreader.ReadBytes($length) | |
| $path = Join-Path $OutPath $fn | |
| if ($Verbose) { | |
| Write-Host "Unpacking $fn from offset $offset with length $length to $path" | |
| } | |
| mkdir -Force (Split-Path -Parent -Path $path) | Out-Null | |
| # check the hash | |
| $shasum = [BitConverter]::ToString($hasher.ComputeHash($patch)).Replace("-", "").ToUpper() | |
| if ($shasum -ne $expectedhash) { | |
| Write-Error Unexpected hash | |
| } | |
| Set-Content -Encoding Byte -Path $path $patch | |
| $n += 1 | |
| } | |
| $psf.Close() | |
| Write-Host "Done!" |
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