diff --git a/src/bitbool.c b/src/bitbool.c
new file mode 100644
index 0000000..07279e4
--- /dev/null
+++ b/src/bitbool.c
@@ -0,0 +1,2 @@
+#include "bitbool.h"
+const cmph_uint8 bitmask[] = { 1, 1 << 1, 1 << 2, 1 << 3, 1 << 4, 1 << 5, 1 << 6, 1 << 7 };
diff --git a/src/bitbool.h b/src/bitbool.h
new file mode 100644
index 0000000..5428919
--- /dev/null
+++ b/src/bitbool.h
@@ -0,0 +1,9 @@
+#ifndef _CMPH_BITBOOL_H__
+#define _CMPH_BITBOOL_H__
+#include "cmph_types.h" 
+extern const cmph_uint8 bitmask[];
+#define GETBIT(array, i) (array[(i) / 8] & bitmask[(i) % 8])
+#define SETBIT(array, i) (array[(i) / 8] |= bitmask[(i) % 8])
+#define UNSETBIT(array, i) (array[(i) / 8] &= (~(bitmask[(i) % 8])))
+
+#endif