/src/botan/src/lib/utils/calendar.cpp
Line | Count | Source (jump to first uncovered line) |
1 | | /* |
2 | | * Calendar Functions |
3 | | * (C) 1999-2010,2017 Jack Lloyd |
4 | | * (C) 2015 Simon Warta (Kullo GmbH) |
5 | | * |
6 | | * Botan is released under the Simplified BSD License (see license.txt) |
7 | | */ |
8 | | |
9 | | #include <botan/internal/calendar.h> |
10 | | #include <botan/exceptn.h> |
11 | | #include <ctime> |
12 | | #include <sstream> |
13 | | #include <iomanip> |
14 | | #include <stdlib.h> |
15 | | |
16 | | namespace Botan { |
17 | | |
18 | | namespace { |
19 | | |
20 | | std::tm do_gmtime(std::time_t time_val) |
21 | 0 | { |
22 | 0 | std::tm tm; |
23 | |
|
24 | | #if defined(BOTAN_TARGET_OS_HAS_WIN32) |
25 | | ::gmtime_s(&tm, &time_val); // Windows |
26 | | #elif defined(BOTAN_TARGET_OS_HAS_POSIX1) |
27 | 0 | ::gmtime_r(&time_val, &tm); // Unix/SUSv2 |
28 | | #else |
29 | | std::tm* tm_p = std::gmtime(&time_val); |
30 | | if (tm_p == nullptr) |
31 | | throw Encoding_Error("time_t_to_tm could not convert"); |
32 | | tm = *tm_p; |
33 | | #endif |
34 | |
|
35 | 0 | return tm; |
36 | 0 | } |
37 | | |
38 | | /* |
39 | | Portable replacement for timegm, _mkgmtime, etc |
40 | | |
41 | | Algorithm due to Howard Hinnant |
42 | | |
43 | | See https://howardhinnant.github.io/date_algorithms.html#days_from_civil |
44 | | for details and explaination. The code is slightly simplified by our assumption |
45 | | that the date is at least 1970, which is sufficient for our purposes. |
46 | | */ |
47 | | size_t days_since_epoch(uint32_t year, uint32_t month, uint32_t day) |
48 | 0 | { |
49 | 0 | if(month <= 2) |
50 | 0 | year -= 1; |
51 | 0 | const uint32_t era = year / 400; |
52 | 0 | const uint32_t yoe = year - era * 400; // [0, 399] |
53 | 0 | const uint32_t doy = (153*(month + (month > 2 ? -3 : 9)) + 2)/5 + day-1; // [0, 365] |
54 | 0 | const uint32_t doe = yoe * 365 + yoe/4 - yoe/100 + doy; // [0, 146096] |
55 | 0 | return era * 146097 + doe - 719468; |
56 | 0 | } |
57 | | |
58 | | } |
59 | | |
60 | | std::chrono::system_clock::time_point calendar_point::to_std_timepoint() const |
61 | 0 | { |
62 | 0 | if(year() < 1970) |
63 | 0 | throw Invalid_Argument("calendar_point::to_std_timepoint() does not support years before 1970"); |
64 | | |
65 | | // 32 bit time_t ends at January 19, 2038 |
66 | | // https://msdn.microsoft.com/en-us/library/2093ets1.aspx |
67 | | // Throw after 2037 if 32 bit time_t is used |
68 | | |
69 | 0 | if constexpr(sizeof(std::time_t) == 4) |
70 | 0 | { |
71 | 0 | if(year() > 2037) |
72 | 0 | { |
73 | 0 | throw Invalid_Argument("calendar_point::to_std_timepoint() does not support years after 2037 on this system"); |
74 | 0 | } |
75 | 0 | } |
76 | | |
77 | | // This upper bound is completely arbitrary |
78 | 0 | if(year() >= 2400) |
79 | 0 | { |
80 | 0 | throw Invalid_Argument("calendar_point::to_std_timepoint() does not support years after 2400"); |
81 | 0 | } |
82 | | |
83 | 0 | const uint64_t seconds_64 = (days_since_epoch(year(), month(), day()) * 86400) + |
84 | 0 | (hour() * 60 * 60) + (minutes() * 60) + seconds(); |
85 | |
|
86 | 0 | const time_t seconds_time_t = static_cast<time_t>(seconds_64); |
87 | |
|
88 | 0 | if(seconds_64 - seconds_time_t != 0) |
89 | 0 | { |
90 | 0 | throw Invalid_Argument("calendar_point::to_std_timepoint time_t overflow"); |
91 | 0 | } |
92 | | |
93 | 0 | return std::chrono::system_clock::from_time_t(seconds_time_t); |
94 | 0 | } |
95 | | |
96 | | std::string calendar_point::to_string() const |
97 | 0 | { |
98 | | // desired format: <YYYY>-<MM>-<dd>T<HH>:<mm>:<ss> |
99 | 0 | std::stringstream output; |
100 | 0 | output << std::setfill('0') |
101 | 0 | << std::setw(4) << year() << "-" |
102 | 0 | << std::setw(2) << month() << "-" |
103 | 0 | << std::setw(2) << day() << "T" |
104 | 0 | << std::setw(2) << hour() << ":" |
105 | 0 | << std::setw(2) << minutes() << ":" |
106 | 0 | << std::setw(2) << seconds(); |
107 | 0 | return output.str(); |
108 | 0 | } |
109 | | |
110 | | calendar_point::calendar_point(const std::chrono::system_clock::time_point& time_point) |
111 | 0 | { |
112 | 0 | std::tm tm = do_gmtime(std::chrono::system_clock::to_time_t(time_point)); |
113 | |
|
114 | 0 | m_year = tm.tm_year + 1900; |
115 | 0 | m_month = tm.tm_mon + 1; |
116 | 0 | m_day = tm.tm_mday; |
117 | 0 | m_hour = tm.tm_hour; |
118 | 0 | m_minutes = tm.tm_min; |
119 | 0 | m_seconds = tm.tm_sec; |
120 | 0 | } |
121 | | |
122 | | } |