max80_fw/esp32/max80/IP4.h

#pragma once

#include "common.h"
#include <WiFi.h>
#include <lwip/inet.h>
#include <esp_wifi.h>

//
// There are no less than 3 different types for IP addresses used
// by different APIs. This class attempts to unify them to mask the
// differences.
//
class IP4 {
private:
    union {
	uint8_t b[4];
	uint32_t l;
    };
public:
    constexpr IP4() : l{0} { }
    constexpr IP4(nullptr_t) : l{0} { }
    constexpr IP4(int ll) : l{(uint32_t)ll} { }
    constexpr IP4(uint32_t ll) : l{ll} { }
    constexpr IP4(uint8_t b0, uint8_t b1, uint8_t b2, uint8_t b3) :
	b{b0,b1,b2,b3} { }
    IP4(const IPAddress & ip) : l{ip} { }
    constexpr IP4(const ip_addr_t & ip) :
	l{ip.type == IPADDR_TYPE_V4 ? ip.u_addr.ip4.addr : 0} { }
    constexpr IP4(const esp_ip_addr_t & ip) :
	l{ip.type == IPADDR_TYPE_V4 ? ip.u_addr.ip4.addr : 0} { }
    IP4(const char *str);

    constexpr operator uint32_t () { return l; }
    operator IPAddress () { return IPAddress(l); }
    constexpr operator ip_addr_t () {
	return ip_addr_t {
	    .u_addr = {.ip4 = {.addr = l}},
	    .type = IPADDR_TYPE_V4
	};
    }
    constexpr operator esp_ip_addr_t () {
	return esp_ip_addr_t {
	    .u_addr = {.ip4 = {.addr = l}},
	    .type = IPADDR_TYPE_V4
	};
    }
    constexpr operator bool () { return l != 0; }
    constexpr bool operator ! () { return l == 0; }
    constexpr bool operator == (const IP4 &b) { return l == b.l; }
    constexpr bool operator != (const IP4 &b) { return l != b.l; }
    constexpr uint8_t operator [] (size_t n) { return b[n]; }
    uint8_t & operator [] (size_t n) { return b[n]; }

    const char *cstr();
};

constexpr IP4 null_ip(0);