cef/include/internal/cef_time.h

// Copyright (c) 2011 Marshall A. Greenblatt. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//    * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//    * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
//    * Neither the name of Google Inc. nor the name Chromium Embedded
// Framework nor the names of its contributors may be used to endorse
// or promote products derived from this software without specific prior
// written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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#ifndef CEF_INCLUDE_INTERNAL_CEF_TIME_H_
#define CEF_INCLUDE_INTERNAL_CEF_TIME_H_
#pragma once

#ifdef __cplusplus
extern "C" {
#endif

#include <stdint.h>
#include <time.h>

#include "include/internal/cef_export.h"

///
/// Represents a wall clock time in UTC. Values are not guaranteed to be
/// monotonically non-decreasing and are subject to large amounts of skew.
/// Time is stored internally as microseconds since the Windows epoch (1601).
///
/// This is equivalent of Chromium `base::Time` (see base/time/time.h).
///
typedef struct _cef_basetime_t {
  int64_t val;
} cef_basetime_t;

///
/// Time information. Values should always be in UTC.
///
typedef struct _cef_time_t {
  ///
  /// Four or five digit year "2007" (1601 to 30827 on Windows, 1970 to 2038 on
  /// 32-bit POSIX)
  ///
  int year;

  ///
  /// 1-based month (values 1 = January, etc.)
  ///
  int month;

  ///
  /// 0-based day of week (0 = Sunday, etc.)
  ///
  int day_of_week;

  ///
  /// 1-based day of month (1-31)
  ///
  int day_of_month;

  ///
  /// Hour within the current day (0-23)
  ///
  int hour;

  ///
  /// Minute within the current hour (0-59)
  ///
  int minute;

  ///
  /// Second within the current minute (0-59 plus leap seconds which may take
  /// it up to 60).
  ///
  int second;

  ///
  /// Milliseconds within the current second (0-999)
  ///
  int millisecond;
} cef_time_t;

///
/// Converts cef_time_t to/from time_t. Returns true (1) on success and false
/// (0) on failure.
///
CEF_EXPORT int cef_time_to_timet(const cef_time_t* cef_time, time_t* time);
CEF_EXPORT int cef_time_from_timet(time_t time, cef_time_t* cef_time);

///
/// Converts cef_time_t to/from a double which is the number of seconds since
/// epoch (Jan 1, 1970). Webkit uses this format to represent time. A value of 0
/// means "not initialized". Returns true (1) on success and false (0) on
/// failure.
///
CEF_EXPORT int cef_time_to_doublet(const cef_time_t* cef_time, double* time);
CEF_EXPORT int cef_time_from_doublet(double time, cef_time_t* cef_time);

///
/// Retrieve the current system time. Returns true (1) on success and false (0)
/// on failure.
///
CEF_EXPORT int cef_time_now(cef_time_t* cef_time);

///
/// Retrieve the current system time.
///
CEF_EXPORT cef_basetime_t cef_basetime_now(void);

///
/// Retrieve the delta in milliseconds between two time values. Returns true (1)
/// on success and false (0) on failure.
//
CEF_EXPORT int cef_time_delta(const cef_time_t* cef_time1,
                              const cef_time_t* cef_time2,
                              long long* delta);

///
/// Converts cef_time_t to cef_basetime_t. Returns true (1) on success and
/// false (0) on failure.
///
CEF_EXPORT int cef_time_to_basetime(const cef_time_t* from, cef_basetime_t* to);

///
/// Converts cef_basetime_t to cef_time_t. Returns true (1) on success and
/// false (0) on failure.
///
CEF_EXPORT int cef_time_from_basetime(const cef_basetime_t from,
                                      cef_time_t* to);

#ifdef __cplusplus
}
#endif

#endif  // CEF_INCLUDE_INTERNAL_CEF_TIME_H_