[refactor] move utils into component

components/utils/bflb_timestamp/bflb_timestamp.c

@@ -0,0 +1,140 @@
+/**
+ * @file bflb_timestamp.c
+ * @brief
+ *
+ * Copyright (c) 2022 Bouffalolab team
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ */
+
+#include "bflb_timestamp.h"
+#include <stdlib.h>
+
+static const uint8_t month_day[12] = {
+    31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
+};
+
+static const uint8_t leap_month_day[12] = {
+    31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
+};
+
+/**
+ *   @brief         check leap year
+ *   @param  year                   year
+ *   @return uint8_t 1 leap year, 0 noleap year
+ */
+static uint8_t check_leap_year(uint16_t year)
+{
+    if (year % 4) {
+        return 0;
+    } else {
+        if ((year % 100 == 0) && (year % 400 != 0)) {
+            return 0;
+        } else {
+            return 1;
+        }
+    }
+}
+
+/**
+ *   @brief         calculate week
+ *   @param  time                   time
+ *   @return uint8_t
+ */
+static void cal_weekday(bflb_timestamp_t *time)
+{
+    uint32_t y, m, d, w;
+
+    y = time->year;
+    m = time->mon;
+    d = time->mday;
+
+    if ((m == 1) || (m == 2)) {
+        m += 12;
+        y--;
+    }
+
+    w = (d + 2 * m + 3 * (m + 1) / 5 + y + y / 4 - y / 100 + y / 400 + 1) % 7;
+
+    time->wday = (uint8_t)w;
+}
+
+/**
+ *   @brief         timestamp to time
+ *   @param  timestamp              timestamp
+ *   @param  time                   time
+ */
+void bflb_timestamp_utc2time(uint32_t utc, bflb_timestamp_t *time)
+{
+#define BFLB_TIMESTAMP_FOUR_YEAR_DAY      ((365 << 2) + 1)
+#define BFLB_TIMESTAMP_SEC_NUM_PER_DAY    (24 * 60 * 60)
+#define BFLB_TIMESTAMP_SEC_NUM_PER_HOUR   (60 * 60)
+#define BFLB_TIMESTAMP_SEC_NUM_PER_MINUTE (60)
+
+#ifndef BFLB_TIMESTAMP_TIMEZONE
+#define BFLB_TIMESTAMP_TIMEZONE 8
+#endif
+
+    uint32_t total_day_num;
+    uint32_t current_sec_num;
+
+    uint16_t remain_day;
+
+    uint16_t temp_year;
+
+    const uint8_t *p = NULL;
+
+    total_day_num = utc / BFLB_TIMESTAMP_SEC_NUM_PER_DAY;
+    current_sec_num = utc % BFLB_TIMESTAMP_SEC_NUM_PER_DAY;
+
+    time->hour = current_sec_num / BFLB_TIMESTAMP_SEC_NUM_PER_HOUR;
+    time->min = (current_sec_num % BFLB_TIMESTAMP_SEC_NUM_PER_HOUR) / BFLB_TIMESTAMP_SEC_NUM_PER_MINUTE;
+    time->sec = (current_sec_num % BFLB_TIMESTAMP_SEC_NUM_PER_HOUR) % BFLB_TIMESTAMP_SEC_NUM_PER_MINUTE;
+
+    time->hour += BFLB_TIMESTAMP_TIMEZONE;
+
+    if (time->hour > 23) {
+        time->hour -= 24;
+        total_day_num++;
+    }
+
+    time->year = 1970 + (total_day_num / BFLB_TIMESTAMP_FOUR_YEAR_DAY) * 4;
+    remain_day = total_day_num % BFLB_TIMESTAMP_FOUR_YEAR_DAY;
+
+    temp_year = check_leap_year(time->year) ? 366 : 365;
+    while (remain_day >= temp_year) {
+        time->year++;
+        remain_day -= temp_year;
+        temp_year = check_leap_year(time->year) ? 366 : 365;
+    }
+
+    p = check_leap_year(time->year) ? leap_month_day : month_day;
+    remain_day++;
+    time->mon = 0;
+    while (remain_day > *(p + time->mon)) {
+        remain_day -= *(p + time->mon);
+        time->mon++;
+    }
+
+    time->mon++;
+    time->mday = remain_day;
+
+    time->wday = time->mday + 2 * time->mon + 3 * (time->mon + 1) / 5 +
+                 time->year + time->year / 4 - time->year / 100 + time->year / 400;
+
+    cal_weekday(time);
+}