Get uncompressed size of many zip files with powershell

user_979325 0
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I need to extract a series of zip files inside a disk. They're a lot of data, so I need to verify if there's sufficient available space. Is there a way to find with Powershell the uncompressed size of the content of a zip file, without uncompressing it? This way I can calculate the uncompressed size of every zip file, sum them and check if my available space is greater than this value.

filesize zip powershell
1 Answers

This function might do it:

function Get-UncompressedZipFileSize {

    param (
        $Path
    )

    $shell = New-Object -ComObject shell.application
    $zip = $shell.NameSpace($Path)
    $size = 0
    foreach ($item in $zip.items()) {
        if ($item.IsFolder) {
            $size += Get-UncompressedZipFileSize -Path $item.Path
        } else {
            $size += $item.size
        }
    }

    # It might be a good idea to dispose the COM object now explicitly, see comments below
    [System.Runtime.InteropServices.Marshal]::ReleaseComObject([System.__ComObject]$shell) | Out-Null
    [System.GC]::Collect()
    [System.GC]::WaitForPendingFinalizers()

    return $size
}

Example usage:

$zipFiles = Get-ChildItem -Path "C:\path\to\zips" -Include *.zip -Recurse
foreach ($zipFile in $zipFiles) {
    Select-Object @{n='FullName'; e={$zipFile.FullName}}, @{n='Size'; e={Get-UncompressedZipFileSize -Path $zipFile.FullName}} -InputObject ''
}

Example output:

FullName                                Size
--------                                ----
C:\test1.zip                         4334400
C:\test2.zip                         8668800
C:\test3.zip                         8668800
user_119422680
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