VtoyTool/BabyISO/biso_joliet.c

   1 /******************************************************************************
   2  * biso_joliet.c
   3  *
   4  * Copyright (c) 2020, longpanda <admin@ventoy.net>
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License as
   8  * published by the Free Software Foundation; either version 3 of the
   9  * License, or (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  18  *
  19  */
  20
  21 #include "biso.h"
  22 #include "biso_joliet.h"
  23
  24 UCHAR BISO_JOLIET_GetLevel(IN CONST UCHAR *pucEscape)
  25 {
  26     UCHAR ucLevel = 0;
  27
  28     /*
  29      * Standard  Level           Decimal        Hex Bytes           ASCII
  30      * UCS-2     Level 1     2/5, 2/15, 4/0   (25)(2F)(40)         '%\@'
  31      * UCS-2     Level 2     2/5, 2/15, 4/3   (25)(2F)(43)         '%\C'
  32      * UCS-2     Level 3     2/5, 2/15, 4/5   (25)(2F)(45)         '%\E
  33      */
  34
  35     if ((NULL != pucEscape) && (0x25 == pucEscape[0]) && (0x2F == pucEscape[1]))
  36     {
  37         if (0x40 == pucEscape[2])
  38         {
  39             ucLevel = 1;
  40         }
  41         else if (0x43 == pucEscape[2])
  42         {
  43             ucLevel = 2;
  44         }
  45         else if (0x45 == pucEscape[2])
  46         {
  47             ucLevel = 3;
  48         }
  49     }
  50
  51     return ucLevel;
  52 }
  53