/*
 * A simple container for two 64-bit numbers
 */
#ifndef BLK128_H
#define BLK128_H 1

#include <common.h>

BEGIN_C_DECLS

#define blk128_set(x, h, l)		\
	do {				\
		uint64_t thi = (h);	\
		uint64_t tlo = (l);	\
		(x)->hi = thi;		\
		(x)->lo = tlo;		\
	} while(0)

#define blk128_zero(x) blk128_set(x, 0, 0)

#define blk128_cp(x, y) blk128_set(x, (y)->hi, (y)->lo)

#define blk128_is_zero(x) (!((x)->hi || (x)->lo))

/**
 * Compare two 128-bit numbers
 */
int blk128_cmp(blk128_t *x, blk128_t *y);

/*
 * Add two 128-bit blocks together, placing the result in rop.
 *
 * It is assumed that op1 >= op2
 */
void blk128_add(blk128_t *rop, blk128_t *op1, blk128_t *op2);

/**
 * Add 3 to x
 */
void blk128_inc3(blk128_t *x);

/*
 * Subtract two 128-bit blocks, placing the result in rop. It is assumed op1 <=
 * op2.
 */
void blk128_sub(blk128_t *rop, blk128_t *op1, blk128_t *op2);

/**
 * Sub 3 from x
 */
void blk128_dec3(blk128_t *x);

/*
 * Increment a 128-bit block
 */
void blk128_inc(blk128_t *x);

/**
 * Multiply two 128-bit numbers, storing the result in a 256-bit block.
 */
void blk128_mul(blk256_t *rop, blk128_t *x, blk128_t *y);

/**
 * Convert 128-bit number to double
 */
double blk128_as_double(blk128_t *op);

END_C_DECLS
#endif /* BLK128_H */