/*
* Integer Rounding Functions
* (C) 1999-2007 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/

#ifndef BOTAN_ROUNDING_H_
#define BOTAN_ROUNDING_H_

#include <botan/types.h>

namespace Botan {

/**
* Round up
* @param n a non-negative integer
* @param align_to the alignment boundary
* @return n rounded up to a multiple of align_to
*/
inline size_t round_up(size_t n, size_t align_to) {
   BOTAN_ARG_CHECK(align_to != 0, "align_to must not be 0");

   if(n % align_to) {
      n += align_to - (n % align_to);
   }
   return n;
}

/**
* Round down
* @param n an integer
* @param align_to the alignment boundary
* @return n rounded down to a multiple of align_to
*/
template <typename T>
inline constexpr T round_down(T n, T align_to) {
   return (align_to == 0) ? n : (n - (n % align_to));
}

}  // namespace Botan

#endif
