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