sync

C/Adidas/shared/bit_stuff.h

@@ -0,0 +1,36 @@
+#pragma once
+
+#include <stdint.h>
+
+/* pre : -
+ * post: the number of bits with value 1 is counted and returned
+ */
+unsigned int count_ones(unsigned int value);
+
+/* pre : -
+ * post: a bitmask with a given width and a given shift is generated (so w=5 and
+ *       s=1 gives 00111110)
+ */
+void make_bitmask(unsigned int width, unsigned int shift, unsigned int* mask);
+
+/* pre : -
+ * post: 'masked_value' is assigned the value of 'value' with the 'mask' applied
+ */
+void apply_bitmask(unsigned int value, unsigned int mask, unsigned int* masked_value);
+
+/* pre : -
+ * post: the bit of index 'bit_index' of 'value' is flipped: 0 --> 1, 1 --> 0.
+ */
+void flip_bit(unsigned int value, unsigned int bit_index, unsigned int* updated_value);
+
+/* pre : -
+ * post: the high and low nibbles of 'value' of stored in 'high_nibble' and
+ *       'low_nibble'.
+ */
+void extract_nibbles_from_byte(uint8_t value, uint8_t* high_nibble, uint8_t* low_nibbe);
+
+/* pre : -
+ * post: the nibble values of the 'high_nibble' and 'low_nibble' are combined
+ *       and stored in 'value'
+ */
+void combine_nibles_to_byte(uint8_t high_nibble, uint8_t low_nibbe, uint8_t* value);