libio: Add a function to open an istream_t from a directory iterator

For the native versions, this is currently dummied out, always returning
an error number. The idea is to laster wrap the libtar interface around
a directory iterator, here we need that method to support the existing
use case in tar2sqfs.

Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>

1 files changed, 13 insertions, 0 deletions

diff --git a/lib/io/src/dir_tree_iterator.c b/lib/io/src/dir_tree_iterator.c
index 604efd5..67d33c3 100644
--- a/lib/io/src/dir_tree_iterator.c
+++ b/lib/io/src/dir_tree_iterator.c
@@ -272,6 +272,18 @@ static void ignore_subdir(dir_iterator_t *base)
 	pop(it);
 }
 
+static int open_file_ro(dir_iterator_t *base, istream_t **out)
+{
+	dir_tree_iterator_t *it = (dir_tree_iterator_t *)base;
+
+	if (it->top == NULL) {
+		*out = NULL;
+		return SQFS_ERROR_NO_ENTRY;
+	}
+
+	return it->top->dir->open_file_ro(it->top->dir, out);
+}
+
 dir_iterator_t *dir_tree_iterator_create(const char *path,
 					 const dir_tree_cfg_t *cfg)
 {
@@ -303,6 +315,7 @@ dir_iterator_t *dir_tree_iterator_create(const char *path,
 	((dir_iterator_t *)it)->read_link = read_link;
 	((dir_iterator_t *)it)->open_subdir = open_subdir;
 	((dir_iterator_t *)it)->ignore_subdir = ignore_subdir;
+	((dir_iterator_t *)it)->open_file_ro = open_file_ro;
 
 	return (dir_iterator_t *)it;
 fail: