Compare files in Windows Powershell

compare_files.ps1

$originalFile = "C:\Users\luenw\Downloads\original.img"
$downloadedFile = "C:\Users\luenw\Downloads\downloaded.img"

$originalHash = Get-FileHash -Path $originalFile -Algorithm MD5
$downloadedHash = Get-FileHash -Path $downloadedFile -Algorithm MD5

if ($originalHash.Hash -eq $downloadedHash.Hash) {
    Write-Output "Checksum: The files are identical."
} else {
    Write-Output "Checksum: The files are different."
}

$chunkSize = 1024 * 1024 # 1MB chunks

# Open files for reading
$originalStream = [System.IO.File]::OpenRead($originalFile)
$downloadedStream = [System.IO.File]::OpenRead($downloadedFile)

$bufferOriginal = New-Object byte[] $chunkSize
$bufferDownloaded = New-Object byte[] $chunkSize

$identical = $true

try {
    while ($true) {
        $bytesReadOriginal = $originalStream.Read($bufferOriginal, 0, $chunkSize)
        $bytesReadDownloaded = $downloadedStream.Read($bufferDownloaded, 0, $chunkSize)
        
        if ($bytesReadOriginal -ne $bytesReadDownloaded) {
            $identical = $false
            break
        }
        
        if ($bytesReadOriginal -eq 0) {
            break
        }
        
        for ($i = 0; $i -lt $bytesReadOriginal; $i++) {
            if ($bufferOriginal[$i] -ne $bufferDownloaded[$i]) {
                $identical = $false
                break
            }
        }
        
        if (-not $identical) {
            break
        }
    }
} finally {
    $originalStream.Close()
    $downloadedStream.Close()
}

if ($identical) {
    Write-Output "Chucks: The files are identical."
} else {
    Write-Output "Chucks: The files are different."
}