1 files changed, 82 insertions, 0 deletions
diff --git a/lib/bitmap.h b/lib/bitmap.h
new file mode 100644
index 000000000..a2d9a50d9
--- /dev/null
+++ b/lib/bitmap.h
@@ -0,0 +1,82 @@
+/*
+ * Copyright (c) 2008 Nicira Networks.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#ifndef BITMAP_H
+#define BITMAP_H 1
+
+#include <limits.h>
+#include <stdlib.h>
+#include "util.h"
+
+#define BITMAP_ULONG_BITS (sizeof(unsigned long) * CHAR_BIT)
+
+static inline unsigned long *
+bitmap_unit__(const unsigned long *bitmap, size_t offset)
+{
+    return (unsigned long *) &bitmap[offset / BITMAP_ULONG_BITS];
+}
+
+static inline unsigned long
+bitmap_bit__(size_t offset)
+{
+    return 1UL << (offset % BITMAP_ULONG_BITS);
+}
+
+static inline unsigned long *
+bitmap_allocate(size_t n_bits)
+{
+    return xcalloc(1, ROUND_UP(n_bits, BITMAP_ULONG_BITS));
+}
+
+static inline void
+bitmap_free(unsigned long *bitmap)
+{
+    free(bitmap);
+}
+
+static inline bool
+bitmap_is_set(const unsigned long *bitmap, size_t offset)
+{
+    return (*bitmap_unit__(bitmap, offset) & bitmap_bit__(offset)) != 0;
+}
+
+static inline void
+bitmap_set1(unsigned long *bitmap, size_t offset)
+{
+    *bitmap_unit__(bitmap, offset) |= bitmap_bit__(offset);
+}
+
+static inline void
+bitmap_set0(unsigned long *bitmap, size_t offset)
+{
+    *bitmap_unit__(bitmap, offset) &= ~bitmap_bit__(offset);
+}
+
+static inline void
+bitmap_set(unsigned long *bitmap, size_t offset, bool value)
+{
+    if (value) {
+        bitmap_set1(bitmap, offset);
+    } else {
+        bitmap_set0(bitmap, offset);
+    }
+}
+
+void bitmap_set_multiple(unsigned long *, size_t start, size_t count,
+                         bool value);
+bool bitmap_equal(const unsigned long *, const unsigned long *, size_t n);
+
+#endif /* bitmap.h */