PcapPlusPlus TCP数据结构

直接上代码

	/**
	 * @struct tcphdr
	 * Represents an TCP protocol header
	 */
#pragma pack(push,1)
	struct tcphdr {
		/** Source TCP port */
		uint16_t portSrc;
		/** Destination TCP port */
		uint16_t portDst;
		/** Sequence number */
		uint32_t sequenceNumber;
		/** Acknowledgment number */
		uint32_t ackNumber;
#if (BYTE_ORDER == LITTLE_ENDIAN)
		uint16_t reserved:4,
		/** Specifies the size of the TCP header in 32-bit words */
		dataOffset:4,
		/** FIN flag */
		finFlag:1,
		/** SYN flag */
		synFlag:1,
		/** RST flag */
		rstFlag:1,
		/** PSH flag */
		pshFlag:1,
		/** ACK flag */
		ackFlag:1,
		/** URG flag */
		urgFlag:1,
		/** ECE flag */
		eceFlag:1,
		/** CWR flag */
		cwrFlag:1;
#elif (BYTE_ORDER == BIG_ENDIAN)
		/** Specifies the size of the TCP header in 32-bit words */
		uint16_t dataOffset:4,
		reserved:4,
		/** CWR flag */
		cwrFlag:1,
		/** ECE flag */
		eceFlag:1,
		/** URG flag */
		urgFlag:1,							// 紧急标志
		/** ACK flag */
		ackFlag:1,
		/** PSH flag */
		pshFlag:1,
		/** RST flag */
		rstFlag:1,
		/** SYN flag */
		synFlag:1,
		/** FIN flag */
		finFlag:1;
#else
#error	"Endian is not LE nor BE..."
#endif
		/** The size of the receive window, which specifies the number of window size units (by default, bytes) */
		uint16_t	windowSize;
		/** The 16-bit checksum field is used for error-checking of the header and data */
		uint16_t	headerChecksum;
		/** If the URG flag (@ref tcphdr#urgFlag) is set, then this 16-bit field is an offset from the sequence number indicating the last urgent data byte */
		uint16_t	urgentPointer;
	};
#pragma pack(pop)