src/add-ons/kernel/file_systems/exfat/Utility.cpp

   1 /*
   2  * Copyright 2011, Jérôme Duval, korli@users.berlios.de.
   3  * Copyright 2014 Haiku, Inc. All rights reserved.
   4  *
   5  * Distributed under the terms of the MIT License.
   6  *
   7  * Authors:
   8  *              Jérôme Duval, korli@users.berlios.de
   9  *              John Scipione, jscipione@gmail.com
  10  */
  11
  12
  13 #include "Utility.h"
  14
  15 #include <stdio.h>
  16 #include <stdlib.h>
  17 #include <string.h>
  18
  19 #include <Errors.h>
  20
  21 #include "convertutf.h"
  22
  23
  24 status_t
  25 get_volume_name(struct exfat_entry* entry, char* name, size_t length)
  26 {
  27         if (entry == NULL || name == NULL)
  28                 return B_BAD_VALUE;
  29
  30         if (entry->type == EXFAT_ENTRY_TYPE_NOT_IN_USE)
  31                 name = "";
  32         else if (entry->type == EXFAT_ENTRY_TYPE_LABEL) {
  33                 ssize_t utf8Length = utf16le_to_utf8(entry->volume_label.name,
  34                         entry->volume_label.length, name, length);
  35                 if (utf8Length < 0)
  36                         return (status_t)utf8Length;
  37         } else
  38                 return B_NAME_NOT_FOUND;
  39
  40         return B_OK;
  41 }
  42
  43
  44 void
  45 get_default_volume_name(off_t partitionSize, char* name, size_t length)
  46 {
  47         off_t divisor = 1ULL << 40;
  48         char unit = 'T';
  49         if (partitionSize < divisor) {
  50                 divisor = 1UL << 30;
  51                 unit = 'G';
  52                 if (partitionSize < divisor) {
  53                         divisor = 1UL << 20;
  54                         unit = 'M';
  55                 }
  56         }
  57
  58         double size = double((10 * partitionSize + divisor - 1) / divisor);
  59                 // %g in the kernel does not support precision...
  60
  61         snprintf(name, length, "%g%ciB ExFAT Volume", size / 10, unit);
  62 }