system/modules/iso9660/volume_descriptor.c

   1 /*
   2  * iso9660 - An iso9660 CDI driver with Rockridge support
   3  *
   4  * Copyright (C) 2008 Janosch Gräf
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the Free
   8  * Software Foundation; either version 3 of the License, or (at your option)
   9  * any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
  14  * more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along with
  17  * this program; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <stdint.h>
  21 #include <string.h>
  22
  23 #include "cdi/fs.h"
  24
  25 #include "iso9660_cdi.h"
  26
  27 #include "iso9660def.h"
  28 #include "volume_descriptor.h"
  29
  30 /**
  31  * Checks signature of volume descriptor
  32  *  @param sig Signature
  33  *  @return If signature is right
  34  */
  35 static int iso9660_voldesc_checksig(uint8_t sig[6]) {
  36   return 1;
  37   //char right[6] = {'C','D','0','0','1',1};
  38   //return memcmp(right,sig,6)==0;
  39 }
  40
  41 /**
  42  * Loads a volume descriptor
  43  *  @param fs Filesystem
  44  *  @param type Type of volume descriptor
  45  *  @param buf Buffer for volume descriptor
  46  *  @return 0=success; -1=failure
  47  */
  48 int iso9660_voldesc_load(struct cdi_fs_filesystem *fs,iso9660_voldesc_type_t type,void *buf) {
  49   debug("iso9660_voldesc_load(0x%x,%d,0x%x)\n",fs,type,buf);
  50   struct iso9660_voldesc header;
  51   size_t i;
  52
  53   for (i=ISO9660_FIRST_SECTOR;header.type!=type && header.type!=ISO9660_VOLDESC_TERM;i++) {
  54     iso9660_sector_read(fs,i*ISO9660_DEFAULT_SECTOR_SIZE,sizeof(header),&header);
  55     if (!iso9660_voldesc_checksig(header.signature)) return -1;
  56   }
  57   i--;
  58
  59   if (header.type==type) {
  60     iso9660_sector_read(fs,i*ISO9660_DEFAULT_SECTOR_SIZE,sizeof(struct iso9660_voldesc_prim),buf);
  61     return 0;
  62   }
  63   else {
  64     debug("Volume Descriptor: Wrong type: %d\n",header.type);
  65     return -1;
  66   }
  67 }