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/*************************************************
* Timestamp Functions Source File *
* (C) 1999-2007 Jack Lloyd *
*************************************************/
#include <botan/timer.h>
#include <botan/loadstor.h>
#include <botan/util.h>
#include <ctime>
namespace Botan {
/*************************************************
* Get the system clock *
*************************************************/
u64bit system_time()
{
return static_cast<u64bit>(std::time(0));
}
/*************************************************
* Default Timer clock reading *
*************************************************/
u64bit Timer::clock() const
{
return combine_timers(std::time(0), std::clock(), CLOCKS_PER_SEC);
}
/*************************************************
* Read the clock and return the output *
*************************************************/
u32bit Timer::fast_poll(byte out[], u32bit length)
{
const u64bit clock_value = this->clock();
for(u32bit j = 0; j != sizeof(clock_value); ++j)
out[j % length] ^= get_byte(j, clock_value);
return (length < 8) ? length : 8;
}
u32bit Timer::slow_poll(byte out[], u32bit length)
{
return fast_poll(out, length);
}
/*************************************************
* Combine a two time values into a single one *
*************************************************/
u64bit Timer::combine_timers(u32bit seconds, u32bit parts, u32bit parts_hz)
{
static const u64bit NANOSECONDS_UNITS = 1000000000;
parts *= (NANOSECONDS_UNITS / parts_hz);
return ((seconds * NANOSECONDS_UNITS) + parts);
}
}
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