icinga-powershell-framework/lib/core/tools/Convert-Bytes.psm1

function Convert-Bytes()
{
    param(
        [string]$Value,
        [string]$Unit
    );

    # Ensure we always use proper formatting of values
    $Value = $Value.Replace(',', '.');

    If (($Value -Match "(^[\d\.]*) ?(B|KB|MB|GB|TB|PT|KiB|MiB|GiB|TiB|PiB)") -eq $FALSE) {
        $Value = [string]::Format('{0}B', $Value);
    }

    If (($Value -Match "(^[\d\.]*) ?(B|KB|MB|GB|TB|PT|KiB|MiB|GiB|TiB|PiB)")) {
        [single]$CurrentValue = $Matches[1];
        [string]$CurrentUnit = $Matches[2];

        switch ($CurrentUnit) {
            { 'KiB', 'MiB', 'GiB', 'TiB', 'PiB' -contains $_ } { $CurrentValue = ConvertTo-ByteIEC $CurrentValue $CurrentUnit; $boolOption = $true; }
            { 'KB', 'MB', 'GB', 'TB', 'PB' -contains $_ } { $CurrentValue = ConvertTo-ByteSI $CurrentValue $CurrentUnit; $boolOption = $true; }
        }

        switch ($Unit) {
            { 'B' -contains $_ } { $FinalValue = $CurrentValue; $boolOption = $true; }
            { 'KB' -contains $_ } { $FinalValue = ConvertTo-Kilobyte $CurrentValue -Unit B; $boolOption = $true; }
            { 'MB' -contains $_ } { $FinalValue = ConvertTo-Megabyte $CurrentValue -Unit B; $boolOption = $true; }
            { 'GB' -contains $_ } { $FinalValue = ConvertTo-Gigabyte $CurrentValue -Unit B; $boolOption = $true; }
            { 'TB' -contains $_ } { $FinalValue = ConvertTo-Terabyte $CurrentValue -Unit B; $boolOption = $true; }
            { 'PB' -contains $_ } { $FinalValue = ConvertTo-Petabyte $CurrentValue -Unit B; $boolOption = $true; }
            { 'KiB' -contains $_ } { $FinalValue = ConvertTo-Kibibyte $CurrentValue -Unit B; $boolOption = $true; }
            { 'MiB' -contains $_ } { $FinalValue = ConvertTo-Mebibyte $CurrentValue -Unit B; $boolOption = $true; }
            { 'GiB' -contains $_ } { $FinalValue = ConvertTo-Gibibyte $CurrentValue -Unit B; $boolOption = $true; }
            { 'TiB' -contains $_ } { $FinalValue = ConvertTo-Tebibyte $CurrentValue -Unit B; $boolOption = $true; }
            { 'PiB' -contains $_ } { $FinalValue = ConvertTo-Petabyte $CurrentValue -Unit B; $boolOption = $true; }

            default {
                if (-Not $boolOption) {
                    Exit-IcingaThrowException -ExceptionType 'Input' -ExceptionThrown $IcingaExceptions.Inputs.ConversionUnitMissing -Force;
                }
            }
        }
        return @{'value' = ([decimal]$FinalValue); 'pastunit' = $CurrentUnit; 'endunit' = $Unit };
    }

    Exit-IcingaThrowException -ExceptionType 'Input' -ExceptionThrown $IcingaExceptions.Inputs.ConversionUnitMissing -Force;
}