Verify MD5 Using Power Shell

# This script needs exactly 1 argument to search for any MHL files
# thus, only works for a project that export MHL files
# If we want to use it in any other projects, then we have to write different script

param($arg1)

if (!$arg1) {
    Write-Host "You have to give me a directory name to search for the MHL files"
    return
}

Write-Host "Searching for MHL files in:" $arg1

$mhl_list = Get-ChildItem -Path $arg1\*.mhl -Recurse -File
$currentDirectory = $PWD

foreach ($mhl_file in $mhl_list) {

    # We will walk into each MHL files found in the directory
    Write-Host "Verifying:" $mhl_file
    [xml]$xmlObj = Get-Content -Path $mhl_file
    if (!$xmlObj) {
        write-host "unexpected Null XML Object:" $mhl_file
        continue
    }

    # We'll have to step into this MHL file folder, in order to get the files correctly
    write-host "Got MHL:" $mhl_file " from directory:" $mhl_file.directory
    cd $mhl_file.directory

    # Now we will walk into each items refer to by this MHL
    foreach ($entry in $xmlObj.hashlist.hash) {
        # skip the creator, etc
        $md5 = Get-FileHash -Path $entry.File -Algorithm MD5
        if ($md5.Hash -ne $entry.md5) {
            # Complain, loudly...
            write-host "HASH FAILED:" $md5.Path " expecting:" $entry.md5 " got:" $md5.Hash
        }
        else {
            write-host $entry.File $md5.Hash "OK"
        }
    }
}