1------------------------------------------------------------------------------
2--                                                                          --
3--                            Matreshka Project                             --
4--                                                                          --
5--         Localization, Internationalization, Globalization for Ada        --
6--                                                                          --
7--                        Runtime Library Component                         --
8--                                                                          --
9------------------------------------------------------------------------------
10--                                                                          --
11-- Copyright © 2011-2013, Vadim Godunko <vgodunko@gmail.com>                --
12-- All rights reserved.                                                     --
13--                                                                          --
14-- Redistribution and use in source and binary forms, with or without       --
15-- modification, are permitted provided that the following conditions       --
16-- are met:                                                                 --
17--                                                                          --
18--  * Redistributions of source code must retain the above copyright        --
19--    notice, this list of conditions and the following disclaimer.         --
20--                                                                          --
21--  * Redistributions in binary form must reproduce the above copyright     --
22--    notice, this list of conditions and the following disclaimer in the   --
23--    documentation and/or other materials provided with the distribution.  --
24--                                                                          --
25--  * Neither the name of the Vadim Godunko, IE nor the names of its        --
26--    contributors may be used to endorse or promote products derived from  --
27--    this software without specific prior written permission.              --
28--                                                                          --
29-- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS      --
30-- "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT        --
31-- LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR    --
32-- A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT     --
33-- HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,   --
34-- SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED --
35-- TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR   --
36-- PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF   --
37-- LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING     --
38-- NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS       --
39-- SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.             --
40--                                                                          --
41------------------------------------------------------------------------------
42--  $Revision: 3663 $ $Date: 2013-01-20 22:32:29 +0400 (Sun, 20 Jan 2013) $
43------------------------------------------------------------------------------
44with Interfaces;
45
46package Matreshka.Internals.Calendars is
47
48   pragma Preelaborate;
49
50   --  Universal Time Coordinated (UTC) representation from the X/Open DCE Time
51   --  Service is used as internal representation. It is defined as follows:
52   --
53   --     Time units          100 nanoseconds (10-7 seconds)
54   --
55   --     Base time           15 October 1582 00:00:00.
56   --
57   --     Approximate range   AD 30,000
58   --
59   --  UTC time in this implementation always refers to time in Greenwich Time
60   --  Zone.
61
62   type Absolute_Time is new Interfaces.Integer_64;
63
64   --  The corresponding internal representations of relative time is the same
65   --  one as for absolute time, and hence with similar characteristics:
66   --
67   --     Time units          100 nanoseconds (10-7 seconds)
68   --
69   --     Approximate range   +/- 30,000 years
70
71   type Relative_Time is new Interfaces.Integer_64;
72
73   type Julian_Day_Number is new Interfaces.Integer_32;
74
75   type Zone_Record is record
76      From   : Absolute_Time;
77      Offset : Relative_Time;
78   end record;
79
80   type Zone_Array is array (Positive range <>) of Zone_Record;
81
82   type Internal_Time_Zone (Length : Natural) is record
83      Data : Zone_Array (1 .. Length);
84   end record;
85
86   type Time_Zone_Access is access all Internal_Time_Zone;
87   for Time_Zone_Access'Storage_Size use 0;
88
89   UTC_Time_Zone : aliased Internal_Time_Zone (0);
90
91end Matreshka.Internals.Calendars;
92