/*
 * Copyright 2011, Jérôme Duval, korli@users.berlios.de.
 * Copyright 2014 Haiku, Inc. All rights reserved.
 *
 * Distributed under the terms of the MIT License.
 *
 * Authors:
 *              Jérôme Duval, korli@users.berlios.de
 *              John Scipione, jscipione@gmail.com
 */


#include "Utility.h"

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <Errors.h>

#include <util/convertutf.h>


status_t
get_volume_name(struct exfat_entry* entry, char* name, size_t length)
{
        if (entry == NULL || name == NULL)
                return B_BAD_VALUE;

        if (entry->type == EXFAT_ENTRY_TYPE_NOT_IN_USE)
                strlcpy(name, "", length);
        else if (entry->type == EXFAT_ENTRY_TYPE_LABEL) {
                ssize_t utf8Length = utf16le_to_utf8(entry->volume_label.name,
                        entry->volume_label.length, name, length);
                if (utf8Length < 0)
                        return (status_t)utf8Length;
        } else
                return B_NAME_NOT_FOUND;

        return B_OK;
}


void
get_default_volume_name(off_t partitionSize, char* name, size_t length)
{
        off_t divisor = 1ULL << 40;
        char unit = 'T';
        if (partitionSize < divisor) {
                divisor = 1UL << 30;
                unit = 'G';
                if (partitionSize < divisor) {
                        divisor = 1UL << 20;
                        unit = 'M';
                }
        }

        double size = double((10 * partitionSize + divisor - 1) / divisor);
                // %g in the kernel does not support precision...

        snprintf(name, length, "%g%ciB ExFAT Volume", size / 10, unit);
}