Adjust directory structure

Ubiquitous/XiUOS/tool/shell/letter-shell/file_ext/utility.h

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+/*
+ * Copyright (c) 2020 AIIT XUOS Lab
+ * XiUOS is licensed under Mulan PSL v2.
+ * You can use this software according to the terms and conditions of the Mulan PSL v2.
+ * You may obtain a copy of Mulan PSL v2 at:
+ *        http://license.coscl.org.cn/MulanPSL2
+ * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
+ * EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
+ * MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
+ * See the Mulan PSL v2 for more details.
+*/
+
+#ifndef __INC_UTILITY_H__
+#define __INC_UTILITY_H__
+
+#include <stdint.h>
+
+#ifndef MAX
+#define MAX(a, b)       ((a) > (b) ? (a) : (b))
+#endif
+
+#ifndef MIN
+#define MIN(a, b)       ((a) < (b) ? (a) : (b))
+#endif
+
+int IsPrefixedWith(char *str, char *prefix);
+char *RemoveUnsafePrefix(char *file_name);
+int IsSuffixedWith(char *file_name, char *suffix);
+int TruncateExtension(char *file_name, char *ext);
+
+unsigned char read8(int fd);
+uint16_t read16Le(int fd);
+uint32_t read32Le(int fd);
+uint64_t read64Le(int fd);
+
+#endif