gistfile1.cpp

#include <msgpack.hpp>
#include <iostream>
#include <sys/time.h>
#include <vector>

struct simple_timer {
	void reset() { gettimeofday(&m_timeval, NULL); }
	void show()
	{
		struct timeval endtime;
		gettimeofday(&endtime, NULL);
		double sec = (endtime.tv_sec - m_timeval.tv_sec)
			+ (double)(endtime.tv_usec - m_timeval.tv_usec) / 1000 / 1000;
		std::cout << sec << " sec" << std::endl;
	}
private:
	struct timeval m_timeval;
};


struct insufficient_buffer_error : public std::runtime_error {
	insufficient_buffer_error() :
		std::runtime_error("buffer is insufficient") { }
};

#define MORE(N) if(m_remain < N) { throw insufficient_buffer_error(); }
#define ADVANCE(N) m_pos += N; m_remain -= N;

class unpacker2 {
public:

	inline uint64_t unpack_uint64()
	{
		uint64_t v;

		MORE(1);
		if(m_pos[0] <= 0x7f) {
			// positivie fixnum
			v = *(uint8_t*)m_pos;
			ADVANCE(1);

		} else if(m_pos[0] == 0xcc) {
			// unsigned int 8
			MORE(2);
			v = *(uint8_t*)(m_pos+1);
			ADVANCE(2);

		} else if(m_pos[0] == 0xcd) {
			// unsigned int 16
			MORE(3);
			v = _msgpack_be16( *(uint16_t*)(m_pos+1) );
			ADVANCE(3);

		} else if(m_pos[0] == 0xce) {
			// unsigned int 32
			MORE(5);
			v = _msgpack_be32( *(uint32_t*)(m_pos+1) );
			ADVANCE(5);

		} else if(m_pos[0] == 0xcf) {
			// unsigned int 64
			MORE(9);
			v = _msgpack_be64( *(uint64_t*)(m_pos+1) );
			ADVANCE(9);

		} else {
			throw msgpack::type_error();
		}

		return v;
	}

	inline uint32_t unpack_array()
	{
		uint32_t len;

		MORE(1);
		if(0x0a <= m_pos[0] && m_pos[0] <= 0xbf) {
			// fixarray
			len = ((unsigned int)m_pos[0]) & 0x0f;
			ADVANCE(1);

		} else if(m_pos[0] == 0xdc) {
			// array 16
			MORE(3);
			len = _msgpack_be16( *(uint16_t*)(m_pos+1) );
			ADVANCE(3);

		} else if(m_pos[0] == 0xdd) {
			// array 32
			MORE(5);
			len = _msgpack_be32( *(uint32_t*)(m_pos+1) );
			ADVANCE(5);
		}

		return len;
	}

public:
	unsigned char* m_buffer;
	unsigned char* m_pos;
	size_t m_remain;
};

int main(int argc, char* argv[])
{
	simple_timer timer;

	msgpack::sbuffer sbuf;
	msgpack::packer<msgpack::sbuffer> pk(sbuf);

	const size_t loop = atoi(argv[1]);

	pk.pack_array(loop);
	for(size_t i=0; i < loop; ++i) {
		msgpack::pack(sbuf, i);
	}

	// static unpacker
	timer.reset();
	{
		unpacker2 pac;
		pac.m_buffer = (unsigned char*)sbuf.data();
		pac.m_pos    = pac.m_buffer;
		pac.m_remain = sbuf.size();

		std::vector<uint64_t> result;

		uint32_t len = pac.unpack_array();
		result.reserve(len);
		for(size_t i=0; i < len; ++i) {
			uint64_t v = pac.unpack_uint64();
			result.push_back(v);
		}
	}
	timer.show();

	// dynamic unpacker + type conversion
	timer.reset();
	{
		msgpack::zone z;
		msgpack::object obj;

		msgpack::unpack(sbuf.data(), sbuf.size(), NULL, &z, &obj);

		std::vector<uint64_t> result;
		obj.convert(&result);
	}
	timer.show();
}


// $ ./a.out 10000
// 0.000489 sec
// 0.000974 sec

// $ ./a.out 1000000
// 0.040277 sec
// 0.084064 sec

// Mac OS X Snow Leopard
// Intel Core 2 Duo 2.53 GHz
// DDR3 1067MHz 8GB