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Filename : swoole_protocol.h
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/*
  +----------------------------------------------------------------------+
  | Swoole                                                               |
  +----------------------------------------------------------------------+
  | This source file is subject to version 2.0 of the Apache license,    |
  | that is bundled with this package in the file LICENSE, and is        |
  | available through the world-wide-web at the following url:           |
  | http://www.apache.org/licenses/LICENSE-2.0.html                      |
  | If you did not receive a copy of the Apache2.0 license and are unable|
  | to obtain it through the world-wide-web, please send a note to       |
  | license@swoole.com so we can mail you a copy immediately.            |
  +----------------------------------------------------------------------+
  | Author: Tianfeng Han  <rango@swoole.com>                             |
  |         Twosee  <twose@qq.com>                                       |
  +----------------------------------------------------------------------+
*/

#pragma once

#include "swoole.h"
#include "swoole_c_api.h"
#include "swoole_socket.h"

#include <netinet/tcp.h>
#include <netdb.h>

namespace swoole {

struct PacketLength {
    const char *buf;
    uint32_t buf_size;
    uint32_t header_len;
};

struct Protocol {
    typedef ssize_t (*LengthFunc)(const Protocol *, network::Socket *, PacketLength *pl);
    /* one package: eof check */
    bool split_by_eof;

    char package_eof[SW_DATA_EOF_MAXLEN];
    uint8_t package_eof_len;

    char package_length_type;
    uint8_t package_length_size;
    uint16_t package_length_offset;
    uint16_t package_body_offset;
    uint32_t package_max_length;

    void *private_data;
    void *private_data_2;

    /**
     * callback this function when a complete data packet is received
     */
    int (*onPackage)(const Protocol *, network::Socket *, const RecvData *);
    /**
     * parse the length value in the received data
     * @return 0: more data needs to be received
     * @return -1: abnormal value, connection should be closed
     * @return >0: the length of the data packet
     */
    LengthFunc get_package_length;
    uint8_t (*get_package_length_size)(network::Socket *);

    int recv_with_eof_protocol(network::Socket *socket, String *buffer);
    int recv_with_length_protocol(network::Socket *socket, String *buffer);
    int recv_split_by_eof(network::Socket *socket, String *buffer);

    static ssize_t default_length_func(const Protocol *protocol, network::Socket *socket, PacketLength *pl);

    static inline LengthFunc get_function(const std::string &name) {
        return (LengthFunc) swoole_get_function(name.c_str(), name.length());
    }
};
}  // namespace swoole

static sw_inline uint16_t swoole_swap_endian16(uint16_t x) {
    return (((x & 0xff) << 8) | ((x & 0xff00) >> 8));
}

static sw_inline uint32_t swoole_swap_endian32(uint32_t x) {
    return (((x & 0xff) << 24) | ((x & 0xff00) << 8) | ((x & 0xff0000) >> 8) | ((x & 0xff000000) >> 24));
}

static sw_inline int32_t swoole_unpack(char type, const void *data) {
    switch (type) {
    /*-------------------------16bit-----------------------------*/
    case 'c':
        return *((int8_t *) data);
    case 'C':
        return *((uint8_t *) data);
    /*-------------------------16bit-----------------------------*/
    /**
     * signed short (always 16 bit, machine byte order)
     */
    case 's':
        return *((int16_t *) data);
    /**
     * unsigned short (always 16 bit, machine byte order)
     */
    case 'S':
        return *((uint16_t *) data);
    /**
     * unsigned short (always 16 bit, big endian byte order)
     */
    case 'n':
        return ntohs(*((uint16_t *) data));
    /**
     * unsigned short (always 32 bit, little endian byte order)
     */
    case 'v':
        return swoole_swap_endian16(ntohs(*((uint16_t *) data)));

    /*-------------------------32bit-----------------------------*/
    /**
     * unsigned long (always 32 bit, machine byte order)
     */
    case 'L':
        return *((uint32_t *) data);
    /**
     * signed long (always 32 bit, machine byte order)
     */
    case 'l':
        return *((int *) data);
    /**
     * unsigned long (always 32 bit, big endian byte order)
     */
    case 'N':
        return ntohl(*((uint32_t *) data));
    /**
     * unsigned short (always 32 bit, little endian byte order)
     */
    case 'V':
        return swoole_swap_endian32(ntohl(*((uint32_t *) data)));

    default:
        return *((uint32_t *) data);
    }
}

static sw_inline uint64_t swoole_hton64(uint64_t host) {
    uint64_t ret = 0;
    uint32_t high, low;

    low = host & 0xFFFFFFFF;
    high = (host >> 32) & 0xFFFFFFFF;
    low = htonl(low);
    high = htonl(high);

    ret = low;
    ret <<= 32;
    ret |= high;
    return ret;
}

static sw_inline uint64_t swoole_ntoh64(uint64_t net) {
    uint64_t ret = 0;
    uint32_t high, low;

    low = net & 0xFFFFFFFF;
    high = net >> 32;
    low = ntohl(low);
    high = ntohl(high);

    ret = low;
    ret <<= 32;
    ret |= high;
    return ret;
}

void swoole_dump_ascii(const char *data, size_t size);
void swoole_dump_bin(const char *data, char type, size_t size);
void swoole_dump_hex(const char *data, size_t outlen);

char *swoole_dec2hex(ulong_t value, int base);
ulong_t swoole_hex2dec(const char *hex, size_t *parsed_bytes);
int swoole_type_size(char type);