1 files changed, 37 insertions, 0 deletions
diff --git a/src/bitfield.c b/src/bitfield.c
new file mode 100644
index 0000000..cec0304
--- /dev/null
+++ b/src/bitfield.c
@@ -0,0 +1,37 @@
+#include "bitfield.h"
+
+
+void prne_bf_set (uint8_t *bf, const unsigned int bit, const bool v) {
+	const unsigned int p = bit / 8;
+	const unsigned int s = bit - p * 8;
+
+	if (v) {
+		bf[p] |= 1 << s;
+	}
+	else {
+		bf[p] &= ~(1 << s);
+	}
+}
+
+bool prne_bf_test (const uint8_t *bf, const unsigned int bit) {
+	const unsigned int p = bit / 8;
+	const unsigned int s = bit - p * 8;
+
+	return bf[p] & (1 << s);
+}
+
+void prne_bf_foreach (
+	void *ctx,
+	const uint8_t *bf,
+	const size_t size,
+	prne_bf_foreach_ft f)
+{
+	unsigned int bit = 0;
+
+	for (size_t i = 0; i < size; i += 1) {
+		for (unsigned int j = 0; j < 8; j += 1) {
+			f(ctx, bit, (bf[i] & (1 << j)) != 0);
+			bit += 1;
+		}
+	}
+}