Bitmap: Add find_region() and find_and_toggle_region()

luna/include/luna/Bitmap.h

@@ -39,6 +39,10 @@ class Bitmap
 
     Option<usize> find_and_toggle(bool value, usize begin = 0);
 
+    Option<usize> find_region(bool value, usize count, usize begin = 0) const;
+
+    Option<usize> find_and_toggle_region(bool value, usize count, usize begin = 0);
+
     void clear(bool value);
     void clear_region(usize start, usize bits, bool value);
 

luna/src/Bitmap.cpp

@@ -132,3 +132,38 @@ Option<usize> Bitmap::find_and_toggle(bool value, usize begin)
     set(index, !value);
     return index;
 }
+
+Option<usize> Bitmap::find_region(bool value, usize count, usize begin) const
+{
+    // FIXME: Optimize this using bit and byte manipulation.
+    u64 region_bits_found = 0;
+    u64 region_start = 0;
+
+    for (u64 index = begin; index < m_size_in_bytes * 8; index++)
+    {
+        if (get(index) != value)
+        {
+            region_bits_found = 0;
+            continue;
+        }
+
+        if (region_bits_found == 0)
+        {
+            region_start = index;
+            region_bits_found++;
+        }
+        else
+            region_bits_found++;
+
+        if (region_bits_found == count) return region_start;
+    }
+
+    return {};
+}
+
+Option<usize> Bitmap::find_and_toggle_region(bool value, usize count, usize begin)
+{
+    usize index = TRY(find_region(value, count, begin));
+    clear_region(index, count, !value);
+    return index;
+}