1 files changed, 5 insertions, 0 deletions
diff --git a/common.h b/common.h
index 821b1cb..0547e3f 100644
--- a/common.h
+++ b/common.h
@@ -5,8 +5,13 @@
 #ifndef PACK_INTERNAL_H
 #define PACK_INTERNAL_H
 
+#include <limits.h>
 #include <stddef.h>
 
+#define BITMASK(n) (UINTMAX_MAX >> (sizeof (uintmax_t) * CHAR_BIT - n))
+
+enum endian { BIG, LITTLE };
+
 size_t getsize(char c);
 
 #endif // !PACK_INTERNAL_H