Eden

0.1.5-alpha

Private/Test-IsAscii.ps1

function Test-IsAscii([System.IO.FileInfo]$item)
{
    begin
    {
        $validList = New-Object Collections.Generic.List[Byte]
        $validList.AddRange([byte[]] (10,13) )
        $validList.AddRange([byte[]] (31..127) )
    }

    process
    {
        try
        {
            $reader = $item.Open([System.IO.FileMode]::Open)
            if (!$reader) {
                return $false
            }
            $bytes = new-object byte[] 1024
            $numRead = $reader.Read($bytes, 0, $bytes.Count)

            for($i=0; $i -lt $numRead; ++$i)
            {
                if (!$validList.Contains($bytes[$i])) {
                    return $false
                }
            }
            return $true
        }
        finally
        {
            if ($reader)
                { $reader.Dispose() }
        }
    }}