utils: add round_up/down() helper functions

1 files changed, 23 insertions, 0 deletions

diff --git a/src/libstrongswan/utils/utils.h b/src/libstrongswan/utils/utils.h
index 0e103de9c..d055f712d 100644
--- a/src/libstrongswan/utils/utils.h
+++ b/src/libstrongswan/utils/utils.h
@@ -671,6 +671,29 @@ static inline u_int64_t untoh64(void *network)
 }
 
 /**
+ * Round up size to be multiple of alignement
+ */
+static inline size_t round_up(size_t size, int alignement)
+{
+	int remainder;
+
+	remainder = size % alignement;
+	if (remainder)
+	{
+		size += alignement - remainder;
+	}
+	return size;
+}
+
+/**
+ * Round down size to be a multiple of alignement
+ */
+static inline size_t round_down(size_t size, int alignement)
+{
+	return size - (size % alignement);
+}
+
+/**
  * Special type to count references
  */
 typedef u_int refcount_t;