Public/Expand-FileFromZipArchive.ps1
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function Expand-FileFromZipArchive { [CmdletBinding(DefaultParameterSetName = 'Expand')] param ( [Parameter(Mandatory, Position = 0)] [string]$Uri, [Parameter(Mandatory, ParameterSetName = 'Expand')] [string[]]$ZipEntryPath, [Parameter(ParameterSetName = 'Expand')] [ValidateNotNullOrEmpty()] [string]$Destination = '.', [Parameter(ParameterSetName = 'Expand')] [switch]$Force, [Parameter(ParameterSetName = 'Expand')] [Alias('FlattenDirStructure')] [switch]$NoContainer, [Parameter(Mandatory, ParameterSetName = 'ListOnly')] [switch]$ListOnly ) $Destination = $PSCmdlet.GetUnresolvedProviderPathFromPSPath($Destination) $Encoding = [System.Text.Encoding]::GetEncoding("iso-8859-1") $ZipSize = Get-ZipSize -Uri $Uri Write-Verbose "Zip size is $ZipSize bytes" $ZipBytes = [byte[]]::new($ZipSize) $LastChunkOffset = [System.Math]::Max($ZipSize - 50kb, 0) $LastChunkSize = $ZipSize - 1 [byte[]]$LastChunk = Get-ZipByte -Uri $Uri -Offset $LastChunkOffset -Size $LastChunkSize $LastChunk.CopyTo($ZipBytes, $LastChunkOffset) $LastChunkText = $Encoding.GetString($LastChunk) $EndOfCentralDirectoryText = [regex]::Match($LastChunkText, 'PK\x05\x06.*').Value $EndOfCentralDirectoryBytes = $Encoding.GetBytes($EndOfCentralDirectoryText) $CentralDirectoryInfo = Get-ZipCentralDirectoryInfo $EndOfCentralDirectoryBytes $CentralDirectoryBytes = [byte[]]::new($CentralDirectoryInfo.Size) [Array]::Copy($ZipBytes, $CentralDirectoryInfo.Offset, $CentralDirectoryBytes, 0, $CentralDirectoryInfo.Size) $CentralDirectoryText = $Encoding.GetString($CentralDirectoryBytes) $Files = [regex]::Split($CentralDirectoryText, 'PK\x01\x02') | Where-Object { $_.Length -ge 42 } | ForEach-Object { $FileHeader = $_ $FileHeaderBytes = $Encoding.GetBytes($_) $FileNameLength = [BitConverter]::ToUInt16($FileHeaderBytes, 24) $FileName = $FileHeader.SubString(42, $FileNameLength) $FileCompressedSize = [BitConverter]::ToUInt32($FileHeaderBytes, 16) $FileOffset = [BitConverter]::ToUInt32($FileHeaderBytes, 38) [PSCustomObject]@{ FileHeader = $_ FileHeaderBytes = $FileHeaderBytes FileNameLength = $FileNameLength FileName = $FileName FileCompressedSize = $FileCompressedSize FileOffset = $FileOffset } } if ($ListOnly) { ($Files).FileName return } # FIXME: Consider looping through $ZipEntryPath instead, thus making it easier to detect if $ZipEntryPath is not present in the zip file $Files | Where-Object FileName -In $ZipEntryPath | ForEach-Object { [byte[]]$CompressedFileBytes = Get-ZipByte -Uri $Uri -Offset $_.FileOffset -Size $_.FileCompressedSize $CompressedFileBytes.CopyTo($ZipBytes, $_.FileOffset) } $Files | Where-Object FileName -In $ZipEntryPath | ForEach-Object ` -Begin { $ZipMemoryStream = [System.IO.MemoryStream]::new() $ZipMemoryStream.Write($ZipBytes, 0, $ZipBytes.Length) $ZipArchive = [System.IO.Compression.ZipArchive]::new($ZipMemoryStream) } ` -Process { $ZipArchiveEntry = $ZipArchive.GetEntry($_.FileName) $CurrentItem = $_ $DestinationPath = switch ($NoContainer) { $true { Join-Path -Path $Destination -ChildPath (Split-Path -Path $CurrentItem.FileName -Leaf) } $false { Join-Path -Path $Destination -ChildPath $CurrentItem.FileName } } $DestinationFolder = Split-Path -Path $DestinationPath -Parent if (-not (Test-Path -Path $DestinationFolder)) { New-Item -Path $DestinationFolder -ItemType Directory } [System.IO.Compression.ZipFileExtensions]::ExtractToFile($ZipArchiveEntry, $DestinationPath, $Force) } } |