1 files changed, 55 insertions, 0 deletions
diff --git a/lib/bitmap.c b/lib/bitmap.c
new file mode 100644
index 000000000..cab7e6d26
--- /dev/null
+++ b/lib/bitmap.c
@@ -0,0 +1,55 @@
+/*
+ * 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.
+ */
+
+#include <config.h>
+#include "bitmap.h"
+#include <string.h>
+
+/* Sets 'count' consecutive bits in 'bitmap', starting at bit offset 'start',
+ * to 'value'. */
+void
+bitmap_set_multiple(unsigned long *bitmap, size_t start, size_t count,
+                    bool value)
+{
+    for (; count && start % BITMAP_ULONG_BITS; count--) {
+        bitmap_set(bitmap, start++, value);
+    }
+    for (; count >= BITMAP_ULONG_BITS; count -= BITMAP_ULONG_BITS) {
+        *bitmap_unit__(bitmap, start) = -(unsigned long) value;
+        start += BITMAP_ULONG_BITS;
+    }
+    for (; count; count--) {
+        bitmap_set(bitmap, start++, value);
+    }
+}
+
+/* Compares the 'n' bits in bitmaps 'a' and 'b'.  Returns true if all bits are
+ * equal, false otherwise. */
+bool
+bitmap_equal(const unsigned long *a, const unsigned long *b, size_t n)
+{
+    size_t i;
+
+    if (memcmp(a, b, n / BITMAP_ULONG_BITS * sizeof(unsigned long))) {
+        return false;
+    }
+    for (i = ROUND_DOWN(n, BITMAP_ULONG_BITS); i < n; i++) {
+        if (bitmap_is_set(a, i) != bitmap_is_set(b, i)) {
+            return false;
+        }
+    }
+    return true;
+}