Add version field to all structs that will remain public.

demo/iso_grow.c

@@ -247,6 +247,7 @@ libburn_data_source_new(struct burn_drive *d)
     IsoDataSource *ret;
     
     ret = malloc(sizeof(IsoDataSource));
+    ret->version = 0;
     ret->refcount = 1;
     ret->read_block = libburn_ds_read_block;
     ret->open = libburn_ds_open;

src/data_source.c

@@ -182,6 +182,7 @@ int iso_data_source_new_from_file(const char *path, IsoDataSource **src)
     }
 
     data->fd = -1;
+    ds->version = 0;
     ds->refcount = 1;
     ds->data = data;
 

src/fs_image.c

@@ -683,6 +683,7 @@ void ifs_free(IsoFileSource *src)
 }
 
 IsoFileSourceIface ifs_class = { 
+    0, /* version */
     ifs_get_path,
     ifs_get_name,
     ifs_lstat,
@@ -1685,6 +1686,7 @@ int iso_image_filesystem_new(IsoDataSource *src, struct iso_read_opts *opts,
     strncpy(ifs->type, "iso ", 4);
     ifs->data = data;
     ifs->refcount = 1;
+    ifs->version = 0;
     ifs->get_root = ifs_get_root;
     ifs->get_by_path = ifs_get_by_path;
     ifs->get_id = ifs_get_id;

src/fs_local.c

@@ -422,6 +422,7 @@ void lfs_free(IsoFileSource *src)
 }
 
 IsoFileSourceIface lfs_class = { 
+    0, /* version */
     lfs_get_path,
     lfs_get_name,
     lfs_lstat,
@@ -631,6 +632,7 @@ int iso_local_filesystem_new(IsoFilesystem **fs)
         /* fill struct */
         strncpy(lfs->type, "file", 4);
         lfs->refcount = 1;
+        lfs->version = 0;
         lfs->data = NULL; /* we don't need private data */
         lfs->get_root = lfs_get_root;
         lfs->get_by_path = lfs_get_by_path;

src/libisofs.h

@@ -109,6 +109,9 @@ typedef struct iso_data_source IsoDataSource;
  * drive.
  */
 struct iso_data_source {
+
+    /* reserved for future usage, set to 0 */
+    int version;
     
     /** 
      * Reference count for the data source. Should be 1 when a new source
@@ -281,6 +284,9 @@ struct iso_filesystem
      */
     char type[4];
 
+    /* reserved for future usage, set to 0 */
+    int version;
+
     /**
      * Get the root of a filesystem.
      * 
@@ -358,6 +364,9 @@ struct iso_filesystem
  */
 struct IsoFileSource_Iface
 {
+    /* reserved for future usage, set to 0 */
+    int version;
+
     /**
      * Get the path, relative to the filesystem this file source belongs to.
      *