cctalk-pkt-utls.h File Reference

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Detailed Description

Provide utility fns that are used in the client and server.

Author:

Rod Boyce

Date:

22/10/04

This module will provide pakcet utility functions

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Defines
#define	CRCGOODFCS   0
	Value returned from a checksum whrn including the CRC checksum.
Functions
teCCTALK_ERRORS	cctu_FillOutPktHeader (tsCCTALK_SOCK_PKT_HDR *sPktHdr, unsigned long lPktType, unsigned long lPktSize)
	Fill out the packet header with the necessary fields.
tCHECKSUM	cctu_ChecksumPacket (void *pvCctPkt, int zlPktLen)
	Will perform a checksum over a packet.

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Define Documentation

#define CRCGOODFCS   0

Value returned from a checksum whrn including the CRC checksum. Any array that already contains a crc component and is run through the crc including the new crc will return 0 on an intel little endian PC anyway

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Function Documentation

tCHECKSUM cctu_ChecksumPacket (  void *  pvCctPkt, int  zlPktLen )

Will perform a checksum over a packet. This checksum is currently a 16-bitn crc of the packet. If the packet was OK then a value of CRCGOODFCS (0xf0b8) should be return if the packet and the CRC has a CRC calculation performed over it. Date: 22/10/04 Author: Rod Boyce Parameters: pvCctPkt  - The address of the packet to do the CRC over zlPktLen  - The number of bytes to do teh CRC on. Returns: CRCGOODFCS is returned for a valid packet anything else for an invalid packet History

teCCTALK_ERRORS cctu_FillOutPktHeader (  tsCCTALK_SOCK_PKT_HDR *  sPktHdr, unsigned long  lPktType, unsigned long  lPktSize )

Fill out the packet header with the necessary fields. This fn will create the header for a cctalk packet Date: 22/10/04 Author: Rod Boyce Parameters: sPktHdr  - pointer to the packet to fill out the data fields lPktType  - The type of packet we are creating lpktsize  - The size of this packet Returns: This function always returns eCCTALK_SUCESS History

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