53 lines
1.5 KiB
C
53 lines
1.5 KiB
C
/* (C) 1997 Microsoft corp.
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*
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* file : X224.c
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* author : Erik Mavrinac
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*
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* description: X.224 functions for encoding and decoding X.224 packets for
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* MCS.
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*/
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#include "precomp.h"
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#pragma hdrstop
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#include <MCSImpl.h>
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/*
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* X.224 connection-confirm packet is laid out as follows:
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* Byte Contents
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* ---- --------
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* 0 RFC1006 version number, must be 0x03.
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* 1 RFC1006 Reserved, must be 0x00.
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* 2 RFC1006 MSB of word-sized total-frame length (incl. X.224 header).
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* 3 RFC1006 LSB of word-sized total-frame length.
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* 4 Length Indicator, the size of the header bytes following (== 2).
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* 5 Connection confirm indicator, 0xD0.
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* 6 MSB of destination socket/port # on receiving machine.
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* 7 LSB of destination socket/port #.
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* 8 MSB of source socket/port # on sending machine.
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* 9 LSB of source socket/port #.
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* 10 Protocol class. Should be 0x00 (X.224 class 0).
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*/
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void CreateX224ConnectionConfirmPacket(
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BYTE *pBuffer,
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unsigned DestPort,
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unsigned SrcPort)
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{
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// RFC1006 header.
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pBuffer[0] = 0x03;
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pBuffer[1] = 0x00;
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pBuffer[2] = 0x00;
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pBuffer[3] = X224_ConnectionConPacketSize;
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// Connection confirm TPDU header.
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pBuffer[4] = 6; // # following bytes.
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pBuffer[5] = X224_ConnectionCon;
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pBuffer[6] = (DestPort & 0xFF00) >> 8;
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pBuffer[7] = (DestPort & 0x00FF);
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pBuffer[8] = (SrcPort & 0xFF00) >> 8;
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pBuffer[9] = (SrcPort & 0x00FF);
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pBuffer[10] = 0x00;
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}
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