#ifndef R_INTERVAL_H
#define R_INTERVAL_H

#include <r_types.h>

#ifdef __cplusplus
extern "C" {
#endif

// An interval in 64-bit address space which is aware of address space wraparound
// Precondition: 0 <= size < 2**64 and addr + size <= 2**64
// range is [], [10, 5) => 10 <= x < (10 + 5)
typedef struct r_interval_t {
	ut64 addr;
	ut64 size;
} RInterval;

typedef RInterval r_itv_t;

static inline RInterval *r_itv_new(ut64 addr, ut64 size) {
	RInterval *itv = R_NEW (RInterval);
	if (itv) {
		itv->addr = addr;
		itv->size = size;
	}
	return itv;
}

static inline void r_itv_free(RInterval *itv) {
	free (itv);
}

static inline ut64 r_itv_begin(RInterval itv) {
	return itv.addr;
}

static inline ut64 r_itv_size(RInterval itv) {
	return itv.size;
}

static inline ut64 r_itv_end(RInterval itv) {
	return itv.addr + itv.size;
}

// Returns true if itv equals itv2
static inline bool r_itv_eq(RInterval itv, RInterval itv2) {
	return itv.addr == itv2.addr && itv.size == itv2.size;
}

// Returns true if itv contains addr
static inline bool r_itv_contain(RInterval itv, ut64 addr) {
	const ut64 end = itv.addr + itv.size;
	if (R_UNLIKELY (end < itv.addr)) {
		RInterval _itv = {end, itv.addr - end};
		return !r_itv_contain (_itv, addr);
	}
	return itv.addr <= addr && addr < end;
}

// Returns true if x is a subset of itv
static inline bool r_itv_include(RInterval itv, RInterval x) {
	const ut64 end = itv.addr + itv.size;
	return itv.addr <= x.addr && (!end || (x.addr + x.size && x.addr + x.size <= end));
}

// Returns true if itv and x overlap (implying they are non-empty)
static inline bool r_itv_overlap(RInterval itv, RInterval x) {
	const ut64 end = itv.addr + itv.size, end1 = x.addr + x.size;
	return (!end1 || itv.addr < end1) && (!end || x.addr < end);
}

static inline bool r_itv_overlap2(RInterval itv, ut64 addr, ut64 size) {
	RInterval rai = {addr, size};
	return r_itv_overlap (itv, rai);
}

// Precondition: itv and x overlap
// Returns the intersection of itv and x
static inline RInterval r_itv_intersect(RInterval itv, RInterval x) {
	const ut64 addr = R_MAX (itv.addr, x.addr);
	const ut64 end = R_MIN (itv.addr + itv.size - 1, x.addr + x.size - 1) + 1;
	RInterval rai = {addr, end - addr};
	return rai;
}

#ifdef __cplusplus
}
#endif

#endif  // R_INTERVAL_H