Fix round_up

1. src/lib/codec/base64/base64.cpp:           :
(round_up<size_t>(input_length, 3) / 3) * 4;
2. src/lib/codec/base64/base64.cpp:           :
(round_up<size_t>(input_length, 4) * 3) / 4;
3. src/lib/filters/transform_filter.cpp:   return round_up(target_size,
update_granularity);
4. src/lib/math/bigint/bigint.cpp:
m_reg.resize(round_up<size_t>(size, 8));
5. src/lib/math/bigint/bigint.cpp:
m_reg.resize(round_up<size_t>((length / WORD_BYTES) + 1, 8));
6. src/lib/math/numbertheory/mp_numth.cpp:   BigInt z(BigInt::Positive,
round_up<size_t>(2*x_sw, 16));
7. src/lib/modes/cbc/cbc.cpp:   return round_up(input_length,
cipher().block_size());
8. src/lib/modes/ecb/ecb.cpp:   return round_up(input_length,
cipher().block_size());
9. src/lib/modes/xts/xts.cpp:   return round_up(input_length,
cipher().block_size());
10. src/lib/pbkdf/pbkdf2/pbkdf2.cpp:   const size_t blocks_needed =
round_up(out_len, prf_sz) / prf_sz;
11. src/lib/tls/tls_record.cpp:   const size_t buf_size = round_up(
12. src/lib/utils/rounding.h:inline T round_up(T n, T align_to)

1. Reason for change
2. Reason for change
3. first argument cannot be 0 (`target_size = 1024`)
4. Is a bug in the current implementation iff `size = 0`
5. first argument cannot be 0
6. round_up should return 0 if `x_sw = 0`
7. ?
8. ?
9. ?
10. first argument cannot be 0 (`if(out_len == 0) return 0;`)
11. first argument is unlikely to be 0 (`iv_size + msg_length + mac_size
+ (block_size ? 1 : 0)`)
12. Implementation

1 files changed, 24 insertions, 3 deletions

diff --git a/src/lib/utils/calendar.cpp b/src/lib/utils/calendar.cpp
index 3ce5170fc..b578f6be9 100644
--- a/src/lib/utils/calendar.cpp
+++ b/src/lib/utils/calendar.cpp
@@ -33,9 +33,30 @@ std::tm do_gmtime(std::time_t time_val)
 
 }
 
-/*
-* Convert a time_point to a calendar_point
-*/
+std::chrono::system_clock::time_point calendar_point::to_std_timepoint()
+   {
+   if (year < 1900)
+      throw Invalid_Argument("calendar_point::to_std_timepoint() does not support years before 1990.");
+
+   std::tm tm;
+   tm.tm_sec   = seconds;
+   tm.tm_min   = minutes;
+   tm.tm_hour  = hour;
+   tm.tm_mday  = day;
+   tm.tm_mon   = month - 1;
+   tm.tm_year  = year - 1900;
+
+   // Convert std::tm to std::time_t
+   // http://stackoverflow.com/questions/16647819/timegm-cross-platform
+   #if defined(BOTAN_TARGET_OS_IS_WINDOWS)
+   #define timegm _mkgmtime
+   #endif
+   std::time_t tt = timegm(&tm);
+
+   return std::chrono::system_clock::from_time_t(tt);
+   }
+
+
 calendar_point calendar_value(
    const std::chrono::system_clock::time_point& time_point)
    {