Add experimental support for Windows VSS

[wimlib] / include / wimlib / win32_vss.h

diff --git a/include/wimlib/win32_vss.h b/include/wimlib/win32_vss.h
new file mode 100644 (file)
index 0000000..6e9c197
--- /dev/null
+++ b/include/wimlib/win32_vss.h
@@ -0,0 +1,45 @@
+/*
+ * win32_vss.h - Declarations for managing VSS snapshots.  This header should
+ * only be included by Windows-specific files.
+ */
+
+#ifndef _WIMLIB_WIN32_VSS_H
+#define _WIMLIB_WIN32_VSS_H
+
+#include "wimlib/win32_common.h"
+
+/* A reference counter for a VSS snapshot.  This is embedded in another data
+ * structure only visible to win32_vss.c.  */
+struct vss_snapshot {
+       size_t refcnt;
+};
+
+extern void
+vss_delete_snapshot(struct vss_snapshot *snapshot);
+
+/* Acquire a reference to the specified VSS snapshot.  */
+static inline struct vss_snapshot *
+vss_get_snapshot(struct vss_snapshot *snapshot)
+{
+       if (snapshot)
+               snapshot->refcnt++;
+       return snapshot;
+}
+
+/* Release a reference to the specified VSS snapshot.  When the last reference
+ * is released, the snapshot is deleted.  */
+static inline void
+vss_put_snapshot(struct vss_snapshot *snapshot)
+{
+       if (snapshot && --snapshot->refcnt == 0)
+               vss_delete_snapshot(snapshot);
+}
+
+extern int
+vss_create_snapshot(const wchar_t *source, UNICODE_STRING *vss_path_ret,
+                   struct vss_snapshot **snapshot_ret);
+
+extern void
+vss_global_cleanup(void);
+
+#endif /* _WIMLIB_WIN32_VSS_H */