fs/iso9660/iso9660_opendir.c

   1 /*
   2  *
   3  * (c) 2005-2009 Laurent Vivier <Laurent@vivier.eu>
   4  *
   5  * This file has been copied from EMILE, http://emile.sf.net
   6  *
   7  */
   8
   9 #include "libiso9660.h"
  10
  11 static inline int iso9660_is_directory(struct iso_directory_record * idr)
  12 {
  13         return ((idr->flags[0] & 2) != 0);
  14 }
  15
  16 static iso9660_DIR* iso9660_opendir_node(iso9660_VOLUME *volume, struct iso_directory_record *node)
  17 {
  18         iso9660_DIR *dir;
  19
  20         dir = (iso9660_DIR*)malloc(sizeof(iso9660_DIR));
  21         if (dir == NULL)
  22                 return NULL;
  23
  24         dir->extent = isonum_733((char *)node->extent);
  25         dir->len = isonum_733((char *)node->size);
  26         dir->index =  sizeof (dir->buffer);
  27         dir->volume = volume;
  28
  29         return dir;
  30 }
  31
  32 static struct iso_directory_record* idr_new(struct iso_directory_record* idr)
  33 {
  34         struct iso_directory_record* result;
  35         int size = sizeof(*idr) + (int)idr->name_len[0];
  36
  37         result = (struct iso_directory_record*)malloc(size);
  38         memcpy(result, idr, size);
  39
  40         return result;
  41 }
  42
  43 static struct iso_directory_record * seek_name(iso9660_VOLUME *volume,
  44                                                struct iso_directory_record *idr,
  45                                                char *name)
  46 {
  47         struct iso_directory_record *result;
  48         char name_buf[256];
  49         iso9660_DIR *dir;
  50
  51         dir = iso9660_opendir_node(volume, idr);
  52         if (dir == NULL)
  53                 return NULL;
  54
  55         while ((idr = iso9660_readdir(dir)) != NULL)
  56         {
  57                 iso9660_name(volume, idr, name_buf);
  58                 if (strcasecmp(name, name_buf) == 0)
  59                 {
  60                         result = idr_new(idr);
  61                         iso9660_closedir(dir);
  62                         return result;
  63                 }
  64         }
  65         iso9660_closedir(dir);
  66         return NULL;
  67 }
  68
  69 struct iso_directory_record* iso9660_get_node(
  70                 iso9660_VOLUME *volume,
  71                 struct iso_directory_record *dirnode,
  72                 const char *path)
  73 {
  74         struct iso_directory_record* result;
  75         struct iso_directory_record* current;
  76         char name[256];
  77         int i;
  78
  79         current = idr_new(dirnode);
  80         while(1)
  81         {
  82                 /* ignore head '\' */
  83
  84                 while (*path && *path == '\\')
  85                         path++;
  86
  87                 if (*path == 0)
  88                         break;
  89
  90                 /* extract first path component */
  91
  92                 i = 0;
  93                 while (*path && *path != '\\')
  94                         name[i++] = *path++;
  95                 name[i] = 0;
  96
  97                 /* seek first component in current directory */
  98
  99                 result = seek_name(volume, current, name);
 100                 if (result == NULL)
 101                         return NULL;
 102
 103                 free(current);
 104                 current = result;
 105         }
 106         return current;
 107 }
 108
 109 iso9660_DIR* iso9660_opendir(iso9660_VOLUME *volume, const char *name)
 110 {
 111         iso9660_DIR *dir;
 112         struct iso_directory_record *node;
 113
 114         node = iso9660_get_root_node((iso9660_VOLUME*)volume);
 115         if (node == NULL)
 116                 return NULL;
 117
 118         node = iso9660_get_node((iso9660_VOLUME*)volume, node, name);
 119         if (node == NULL)
 120                 return NULL;
 121         if (!iso9660_is_directory(node)) {
 122                 free(node);
 123                 return NULL;
 124         }
 125
 126         dir = iso9660_opendir_node((iso9660_VOLUME*)volume, node);
 127
 128         free(node);
 129
 130         dir->volume = (iso9660_VOLUME*)volume;
 131
 132         return dir;
 133 }