fs: move bitmap classes out of save::

libraries/libstratosphere/include/stratosphere/fssystem/fssystem_bitmap_utils.hpp

@@ -0,0 +1,56 @@
+/*
+ * Copyright (c) Atmosphère-NX
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#pragma once
+#include <vapours.hpp>
+
+namespace ams::fssystem {
+
+    constexpr inline s32 CountLeadingZeros(u32 val) {
+        return util::CountLeadingZeros(val);
+    }
+
+    constexpr inline s32 CountLeadingOnes(u32 val) {
+        return CountLeadingZeros(~val);
+    }
+
+    inline u32 ReadU32(const u8 *buf, size_t index) {
+        u32 val;
+        std::memcpy(std::addressof(val), buf + index, sizeof(u32));
+        return val;
+    }
+
+    inline void WriteU32(u8 *buf, size_t index, u32 val) {
+        std::memcpy(buf + index, std::addressof(val), sizeof(u32));
+    }
+
+   constexpr inline bool IsPowerOfTwo(s32 val) {
+       return util::IsPowerOfTwo(val);
+   }
+
+   constexpr inline u32 ILog2(u32 val) {
+       AMS_ASSERT(val > 0);
+       return (BITSIZEOF(u32) - 1 - util::CountLeadingZeros<u32>(val));
+   }
+
+   constexpr inline u32 CeilingPowerOfTwo(u32 val) {
+       if (val == 0) {
+           return 1;
+       }
+
+       return util::CeilingPowerOfTwo<u32>(val);
+   }
+
+}