use struct design_matrix

[pspp-builds.git] / src / data / storage-stream.c

diff --git a/src/data/storage-stream.c b/src/data/storage-stream.c
index a758c5a1e021e66051778b320203c186b5c21805..731fea39ba782125c3c61e1652f7a0c19576be42 100644 (file)
--- a/src/data/storage-stream.c
+++ b/src/data/storage-stream.c
@@ -21,6 +21,7 @@
 
 #include <data/storage-stream.h>
 
+#include <assert.h>
 #include <stdlib.h>
 
 #include <data/case-sink.h>
@@ -151,6 +152,7 @@ const struct case_source_class storage_source_class =
     storage_source_destroy,
   };
 
+/* Returns the casefile encapsulated by SOURCE. */
 struct casefile *
 storage_source_get_casefile (struct case_source *source) 
 {
@@ -160,13 +162,30 @@ storage_source_get_casefile (struct case_source *source)
   return info->casefile;
 }
 
+/* Destroys SOURCE and returns the casefile that it
+   encapsulated. */
+struct casefile *
+storage_source_decapsulate (struct case_source *source) 
+{
+  struct storage_stream_info *info = source->aux;
+  struct casefile *casefile;
+
+  assert (source->class == &storage_source_class);
+  casefile = info->casefile;
+  info->casefile = NULL;
+  free_case_source (source);
+  return casefile;
+}
+
+/* Creates and returns a new storage stream that encapsulates
+   CASEFILE. */
 struct case_source *
-storage_source_create (struct casefile *cf)
+storage_source_create (struct casefile *casefile)
 {
   struct storage_stream_info *info;
 
   info = xmalloc (sizeof *info);
-  info->casefile = cf;
+  info->casefile = casefile;
 
   return create_case_source (&storage_source_class, info);
 }