Restructured the major interfaces of the filesystem

lfs_util.h

@@ -0,0 +1,38 @@
+/*
+ * lfs utility functions
+ *
+ * Copyright (c) 2017 Christopher Haster
+ * Distributed under the MIT license
+ */
+#ifndef LFS_UTIL_H
+#define LFS_UTIL_H
+
+#include "lfs_config.h"
+
+
+// Builtin functions
+static inline uint32_t lfs_max(uint32_t a, uint32_t b) {
+    return (a > b) ? a : b;
+}
+
+static inline uint32_t lfs_min(uint32_t a, uint32_t b) {
+    return (a < b) ? a : b;
+}
+
+static inline uint32_t lfs_ctz(uint32_t a) {
+    return __builtin_ctz(a);
+}
+
+static inline uint32_t lfs_npw2(uint32_t a) {
+    return 32 - __builtin_clz(a-1);
+}
+
+static inline int lfs_scmp(uint32_t a, uint32_t b) {
+    return (int)(unsigned)(a - b);
+}
+
+uint32_t lfs_crc(const void *buffer, lfs_size_t size, uint32_t crc);
+
+
+
+#endif