/*
 * =====================================================================================
 *
 *       Filename:  bh_util.h
 *
 *    Description:  
 *
 *        Version:  1.0
 *        Created:  2021年03月13日 10时41分07秒
 *       Revision:  none
 *       Compiler:  gcc
 *
 *         Author:  lichao (), 
 *   Organization:  
 *
 * =====================================================================================
 */
#ifndef BH_UTIL_SOXWOK67
#define BH_UTIL_SOXWOK67

#include <functional>
#include <stdint.h>

inline uint16_t Get8(const void *p)
{
	return static_cast<const uint8_t*>(p)[0];
}
inline void Put8(void *p, uint8_t u)
{
	static_cast<uint8_t *>(p)[0] = u;
}

inline uint16_t Get16(const void *p)
{
	auto ptr = static_cast<const uint8_t*>(p);
	return (((uint16_t)ptr[0]) << 8u) |
		   (((uint16_t)ptr[1]));
}
inline void Put16(void *p, uint16_t u)
{
	auto ptr = static_cast<uint8_t *>(p);
	ptr[0] = (uint8_t)(u >> 8u);
	ptr[1] = (uint8_t)(u);
}

inline uint32_t Get32(const void *p)
{
	auto ptr = static_cast<const uint8_t*>(p);
	return (((uint32_t)ptr[0]) << 24u) |
		   (((uint32_t)ptr[1]) << 16u) |
		   (((uint32_t)ptr[2]) << 8u) |
		   (((uint32_t)ptr[3]));
}
inline void Put32(void *p, uint32_t u)
{
	auto ptr = static_cast<uint8_t *>(p);
	ptr[0] = (uint8_t)(u >> 24u);
	ptr[1] = (uint8_t)(u >> 16u);
	ptr[2] = (uint8_t)(u >> 8u);
	ptr[3] = (uint8_t)(u);
}

inline uint64_t Get64(const void *p)                             
{
	auto ptr = static_cast<const uint8_t*>(p);
	return (((uint64_t)ptr[0]) << 56u) |
		   (((uint64_t)ptr[1]) << 48u) |
		   (((uint64_t)ptr[2]) << 40u) |
		   (((uint64_t)ptr[3]) << 32u) |
		   (((uint64_t)ptr[4]) << 24u) |
		   (((uint64_t)ptr[5]) << 16u) |
		   (((uint64_t)ptr[6]) << 8u) |
		   ((uint64_t)ptr[7]);
}
inline void Put64(void *p, uint64_t u)
{
	auto ptr = static_cast<uint8_t *>(p);
	ptr[0] = (uint8_t)(u >> 56);
	ptr[1] = (uint8_t)(u >> 48);
	ptr[2] = (uint8_t)(u >> 40u);
	ptr[3] = (uint8_t)(u >> 32);
	ptr[4] = (uint8_t)(u >> 24u);
	ptr[5] = (uint8_t)(u >> 16u);
	ptr[6] = (uint8_t)(u >> 8u);
	ptr[7] = (uint8_t)(u);
}

inline void PutInt(void *p, uint8_t u) { Put8(p, u); }
inline void PutInt(void *p, uint16_t u) { Put16(p, u); }
inline void PutInt(void *p, uint32_t u) { Put32(p, u); }
inline void PutInt(void *p, uint64_t u) { Put64(p, u); }

class ExitCall
{
    typedef std::function<void(void)> func_t;
    func_t m_func;
public:
    explicit ExitCall(func_t f): m_func(f) {}
    ~ExitCall() { if (m_func) { m_func(); } }
};

// macro helper
#define JOIN_IMPL(a, b) a ## b
#define JOIN(a, b)  JOIN_IMPL(a , b)
// defer function / lambda.
#define DEFERF(func) ExitCall JOIN(defer_ , __LINE__)(func)
// defer simple expression
#define DEFER1(expr) DEFERF([&](){ expr; })


#endif /* end of include guard: BH_UTIL_SOXWOK67 */