text: /*
   * Copyright (C) 2010 The Android Open Source Project
   *
   * Licensed 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.
   */
  
  #define LOG_TAG "MtpUtils"
  
  #include <stdio.h>
  #include <time.h>
  
  // #include <cutils/tztime.h>
  #include "MtpUtils.h"
  
  namespace android {
  
  /*
  DateTime strings follow a compatible subset of the definition found in ISO 8601, and
  take the form of a Unicode string formatted as: "YYYYMMDDThhmmss.s". In this
  representation, YYYY shall be replaced by the year, MM replaced by the month (01-12),
  DD replaced by the day (01-31), T is a constant character 'T' delimiting time from date,
  hh is replaced by the hour (00-23), mm is replaced by the minute (00-59), and ss by the
  second (00-59). The ".s" is optional, and represents tenths of a second.
  */
  
  bool parseDateTime(const char* dateTime, time_t& outSeconds) {
      int year, month, day, hour, minute, second;
      struct tm tm;
  
      if (sscanf(dateTime, "%04d%02d%02dT%02d%02d%02d",
              &year, &month, &day, &hour, &minute, &second) != 6)
          return false;
      const char* tail = dateTime + 15;
      // skip optional tenth of second
      if (tail[0] == '.' && tail[1])
          tail += 2;
      //FIXME - support +/-hhmm
      bool useUTC = (tail[0] == 'Z');
  
      // hack to compute timezone
      time_t dummy;
      tzset();
      localtime_r(&dummy, &tm);
  
      tm.tm_sec = second;
      tm.tm_min = minute;
      tm.tm_hour = hour;
      tm.tm_mday = day;
      tm.tm_mon = month - 1;  // mktime uses months in 0 - 11 range
      tm.tm_year = year - 1900;
      tm.tm_wday = 0;
      tm.tm_isdst = -1;
      outSeconds = mktime(&tm);
      /*if (useUTC)
          outSeconds = mktime(&tm);
      else
          outSeconds = mktime_tz(&tm, tm.tm_zone);*/
  
      return true;
  }
  
  void formatDateTime(time_t seconds, char* buffer, int bufferLength) {
      struct tm tm;
  
      localtime_r(&seconds, &tm);
      snprintf(buffer, bufferLength, "%04d%02d%02dT%02d%02d%02d",
          tm.tm_year + 1900, 
          tm.tm_mon + 1, // localtime_r uses months in 0 - 11 range
          tm.tm_mday, tm.tm_hour, tm.tm_min, tm.tm_sec);
  }
  
  }  // namespace android
  