MP-SPDZ/Tools/int.h

/*
 * int.h
 *
 */

#ifndef TOOLS_INT_H_
#define TOOLS_INT_H_


typedef unsigned char octet;

// Assumes word is a 64 bit value
#ifdef WIN32
  typedef unsigned __int64 word;
#else
  typedef unsigned long word;
#endif


inline int CEIL_LOG2(int x)
{
    int result = 0;
    x--;
    while (x > 0)
    {
        result++;
        x >>= 1;
    }
    return result;
}

inline int FLOOR_LOG2(int x)
{
    int result = 0;
    while (x > 1)
    {
        result++;
        x >>= 1;
    }
    return result;
}

// ceil(n / k)
inline long long DIV_CEIL(long long n, long long k)
{
    return (n + k - 1)/k;
}

inline long long multiple_minimum(long long n, long long k)
{
    return DIV_CEIL(n, k) * k;
}

inline void INT_TO_BYTES(octet *buff, int x)
{
    buff[0] = x&255;
    buff[1] = (x>>8)&255;
    buff[2] = (x>>16)&255;
    buff[3] = (x>>24)&255;
}

inline int BYTES_TO_INT(octet *buff)
{
    return buff[0] + 256*buff[1] + 65536*buff[2] + 16777216*buff[3];
}

inline int positive_modulo(int i, int n) {
    return (i % n + n) % n;
}

#endif /* TOOLS_INT_H_ */