apps/iso9660/res.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 <string.h>
  21 #include <stdlib.h>
  22
  23 #include "cdi/lists.h"
  24 #include "cdi/fs.h"
  25 #include "cdi/cache.h"
  26
  27 #include "volume_descriptor.h"
  28
  29 #include "iso9660_cdi.h"
  30
  31 /**
  32  * Creates a new resource
  33  *  @param name Name of resource
  34  *  @param parent Parent resource
  35  *  @param class File class
  36  *  @param type Special file type
  37  *  @return ISO9660 class
  38  */
  39 struct iso9660_fs_res *iso9660_fs_res_create(const char *name,struct iso9660_fs_res *parent,cdi_fs_res_class_t class,cdi_fs_res_type_t type) {
  40   debug("iso9660_fs_res_create(%s,0x%x,%d)\n",name,parent,class);
  41   struct iso9660_fs_res *res = malloc(sizeof(struct iso9660_fs_res));
  42
  43   memset(res,0,sizeof(struct iso9660_fs_res));
  44   res->res.name = strdup(name);
  45   res->res.res = &iso9660_fs_res_res;
  46   res->res.parent = (struct cdi_fs_res*)parent;
  47   res->class = class;
  48   res->res.type = type;
  49   if (class==CDI_FS_CLASS_DIR) res->res.dir = &iso9660_fs_res_dir;
  50   else res->res.file = &iso9660_fs_res_file;
  51   res->res.flags.read = 1;
  52   res->res.flags.execute = 1;
  53   res->res.flags.browse = 1;
  54   res->res.flags.read_link = 1;
  55
  56   if (parent!=NULL) {
  57     res->voldesc = parent->voldesc;
  58     res->cache = parent->cache;
  59   }
  60   return res;
  61 }
  62
  63 /**
  64  * Destroys a resource
  65  *  @param res ISO9660 resource
  66  *  @return 0=success; -1=failure
  67  */
  68 int iso9660_fs_res_destroy(struct iso9660_fs_res *res) {
  69   debug("iso9660_fs_res_destroy(0x%x)\n",res);
  70   free(res->res.name);
  71   if (res->res.children!=NULL) {
  72     size_t i;
  73     struct iso9660_fs_res *child;
  74     for (i=0;(child = cdi_list_get(res->res.children,i));i++) iso9660_fs_res_destroy(child);
  75     cdi_list_destroy(res->res.children);
  76   }
  77   return 0;
  78 }
  79
  80 /**
  81  * Loads a resource
  82  *  @param stream CDI FS stream
  83  *  @return 0=success; -1=failure
  84  */
  85 int iso9660_fs_res_load(struct cdi_fs_stream *stream) {
  86   struct iso9660_fs_res *res = (struct iso9660_fs_res*)stream->res;
  87
  88   if (!res->res.loaded) {
  89     if (res->class==CDI_FS_CLASS_DIR) res->res.children = iso9660_dir_load(res);
  90     else res->res.children = cdi_list_create();
  91     res->res.loaded = 1;
  92   }
  93   return 1;
  94 }
  95
  96 /**
  97  * Unloads a resource
  98  *  @param stream CDI FS stream
  99  *  @return 0=success; -1=failure
 100  */
 101 int iso9660_fs_res_unload(struct cdi_fs_stream *stream) {
 102   struct iso9660_fs_res *res = (struct iso9660_fs_res*)stream->res;
 103
 104   if (res->res.loaded) {
 105     // Destroy children
 106     struct iso9660_fs_res *child;
 107     while ((child = cdi_list_pop(res->res.children))) iso9660_fs_res_destroy(child);
 108     cdi_list_destroy(res->res.children);
 109
 110     res->res.loaded = 0;
 111   }
 112   return 1;
 113 }
 114
 115 /**
 116  * Reads meta data from resource
 117  *  @param stream CDI FS stream
 118  *  @param meta Type of meta data
 119  *  @return Meta data
 120  */
 121 int64_t iso9660_fs_res_meta_read(struct cdi_fs_stream *stream,cdi_fs_meta_t meta) {
 122   struct iso9660_fs_res *res = (struct iso9660_fs_res*)stream->res;
 123   switch (meta) {
 124     case CDI_FS_META_SIZE:
 125       return res->res.dir!=NULL?0:res->data_size;
 126
 127     case CDI_FS_META_USEDBLOCKS:
 128       return (res->data_size-1)/res->voldesc->sector_size+1;
 129
 130     case CDI_FS_META_BESTBLOCKSZ:
 131     case CDI_FS_META_BLOCKSZ:
 132       return res->voldesc->sector_size;
 133
 134     case CDI_FS_META_CREATETIME:
 135       return res->ctime;
 136
 137     case CDI_FS_META_ACCESSTIME:
 138       return res->atime;
 139
 140     case CDI_FS_META_CHANGETIME:
 141       return res->mtime;
 142   }
 143   return 0;
 144 }