// SPDX-License-Identifier: LGPL-3.0-or-later

#pragma once

#define HKVS_API extern __attribute__((__visibility__("protected"), __nothrow__))
#define HKVS_INTERNAL extern __attribute__((__visibility__("hidden"), __nothrow__))

#define HKVS_PURE __attribute__((__pure__))

#define HKVS_CONST __attribute__((__const__))

#define HKVS_NORETURN __attribute__((__noreturn__, __cold__))

#define HKVS_FALLTHROUGH __attribute__((__fallthrough__))

#include <hkvs.h>

#include <assert.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>

HKVS_INLINE void hkvs_assume(bool cond) {
	if(!cond) {
#ifdef HKVS_FUZZING
		hkvs_die("assumption failed");
#else
		__builtin_unreachable();
#endif
	}
}

HKVS_INLINE uint8_t hkvs_read_u8(const char *pv) {
	const uint8_t *p = (const uint8_t*)pv;
	return *p;
}

HKVS_INLINE void hkvs_write_u8(char *pv, uint8_t v) {
	uint8_t *p = (uint8_t*)pv;
	p[0] = v;
}
HKVS_INLINE uint16_t hkvs_read_u16(const char *pv) {
	const uint8_t *p = (const uint8_t*)pv;
	return (uint16_t)(
		(uint16_t)p[0] |
		(uint16_t)p[1] << 8
	);
}

HKVS_INLINE void hkvs_write_u16(char *pv, uint16_t v) {
	uint8_t *p = (uint8_t*)pv;
	p[0] = (uint8_t)(v >> 0);
	p[1] = (uint8_t)(v >> 8);
}

HKVS_INLINE uint32_t hkvs_read_u32(const char *pv) {
	const uint8_t *p = (const uint8_t*)pv;
	return (uint32_t)(
		(uint32_t)p[0] |
		(uint32_t)p[1] << 8 |
		(uint32_t)p[2] << 16 |
		(uint32_t)p[3] << 24
	);
}

HKVS_INLINE void hkvs_write_u32(char *pv, uint32_t v) {
	uint8_t *p = (uint8_t*)pv;
	p[0] = (uint8_t)(v >> 0);
	p[1] = (uint8_t)(v >> 8);
	p[2] = (uint8_t)(v >> 16);
	p[3] = (uint8_t)(v >> 24);
}

HKVS_INLINE uint64_t hkvs_read_u64(const char *pv) {
	const uint8_t *p = (const uint8_t*)pv;
	return (uint64_t)(
		(uint64_t)p[0] |
		(uint64_t)p[1] << 8 |
		(uint64_t)p[2] << 16 |
		(uint64_t)p[3] << 24 |
		(uint64_t)p[4] << 32 |
		(uint64_t)p[5] << 40 |
		(uint64_t)p[6] << 48 |
		(uint64_t)p[7] << 56
	);
}

HKVS_INLINE void hkvs_write_u64(char *pv, uint64_t v) {
	uint8_t *p = (uint8_t*)pv;
	p[0] = (uint8_t)(v >> 0);
	p[1] = (uint8_t)(v >> 8);
	p[2] = (uint8_t)(v >> 16);
	p[3] = (uint8_t)(v >> 24);
	p[4] = (uint8_t)(v >> 32);
	p[5] = (uint8_t)(v >> 40);
	p[6] = (uint8_t)(v >> 48);
	p[7] = (uint8_t)(v >> 56);
}

HKVS_INTERNAL HKVS_NORETURN void hkvs_die(const char *msg);

HKVS_INTERNAL HKVS_NORETURN void hkvs_die_ext(const char *func, const char *file, int line, const char *msg);

#define hkvs_die(msg) hkvs_die_ext(__func__, __FILE__, __LINE__, msg)

HKVS_INTERNAL HKVS_PURE uint64_t hkvs_hash(const char *hk, const char *data, size_t data_size);