Tasmota/lib/lib_div/ArduinoNTPd/NTPPacket.h

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2019-12-17 02:29:36 +00:00
/*
* File: NTPPacket.h
* Description:
* NTP packet representation.
* Author: Mooneer Salem <mooneer@gmail.com>
* License: New BSD License
*/
#ifndef NTP_PACKET_H
#define NTP_PACKET_H
#include "Arduino.h"
/*
* Contains the data in a typical NTP packet.
*/
struct NtpPacket
{
static const int PACKET_SIZE = 48;
unsigned char leapVersionMode;
unsigned int leapIndicator() const { return leapVersionMode >> 6; }
void leapIndicator(unsigned int newValue) { leapVersionMode = (0x3F & leapVersionMode) | ((newValue & 0x03) << 6); }
unsigned int versionNumber() const { return (leapVersionMode >> 3) & 0x07; }
void versionNumber(unsigned int newValue) { leapVersionMode = (0xC7 & leapVersionMode) | ((newValue & 0x07) << 3); }
unsigned int mode() const { return (leapVersionMode & 0x07); }
void mode(unsigned int newValue) { leapVersionMode = (leapVersionMode & 0xF8) | (newValue & 0x07); }
char stratum;
char poll;
char precision;
uint32_t rootDelay;
uint32_t rootDispersion;
char referenceId[4];
uint32_t referenceTimestampSeconds;
uint32_t referenceTimestampFraction;
uint32_t originTimestampSeconds;
uint32_t originTimestampFraction;
uint32_t receiveTimestampSeconds;
uint32_t receiveTimestampFraction;
uint32_t transmitTimestampSeconds;
uint32_t transmitTimestampFraction;
/*
* Rearranges bytes in 32 bit values from big-endian (NTP protocol)
* to little-endian (Arduino/PC), or vice versa. Must be called before
* modifying the structure or sending the packet.
*/
void swapEndian();
/*
* Returns packet as a char array for transmission via network.
* WARNING: modifying the return value is unsafe.
*/
const char *packet() { return (const char*)this; }
/*
* Copies packet buffer to packet object.
*/
void populatePacket(const char *buffer)
{
memcpy(this, buffer, PACKET_SIZE);
}
private:
/*
* Reverses bytes in a number.
*/
void reverseBytes_(uint32_t *number);
};
#endif // NTP_PACKET_H