90 lines
2.3 KiB
C
90 lines
2.3 KiB
C
/* (C) 1997 Microsoft Corp.
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*
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* file : X224.h
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* author : Erik Mavrinac
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*
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* description: X.224 types and defines for encoding and decoding X.224
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* packets for MCS.
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*/
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#ifndef __X224_H
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#define __X224_H
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/*
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* Defines
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*/
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#define X224_ConnectionConPacketSize 11
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#define X224_DataHeaderSize 7
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// TPDU types.
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#define X224_None 0
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#define X224_ConnectionReq 0xE0
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#define X224_ConnectionCon 0xD0
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#define X224_Disconnect 0x80
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#define X224_Error 0x70
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#define X224_Data 0xF0
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// X.224 Data EOT field.
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#define X224_EOT 0x80
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// X.224 Connect Request extra field type.
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#define TPDU_SIZE 0xC0
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// RFC1006 default of 65531 minus 3 bytes for data TPDU header.
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#define X224_DefaultDataSize 65528
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/*
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* Prototypes for worker functions referred to by other files.
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*/
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void CreateX224ConnectionConfirmPacket(BYTE *, unsigned, unsigned);
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/*
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* X.224 data header 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. whole 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 Data packet indicator, 0xF0.
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* 6 X224_EOT (0x80) if this is the last packet, 0x00 otherwise.
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*
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* bLastTPDU is nonzero when the data in this TPDU is the final X.224 block
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* in this data send sequence.
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*
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* Assumes that PayloadDataSize does not exceed the maximum X.224 user data size
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* negotiated during X.224 connection.
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*/
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__inline void CreateX224DataHeader(
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BYTE *pBuffer,
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unsigned PayloadDataSize,
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BOOLEAN bLastTPDU)
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{
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unsigned TotalSize;
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TotalSize = PayloadDataSize + X224_DataHeaderSize;
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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] = (TotalSize & 0x0000FF00) >> 8;
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pBuffer[3] = (TotalSize & 0x000000FF);
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// Data TPDU header.
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pBuffer[4] = 0x02; // Size of TPDU bytes following.
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pBuffer[5] = X224_Data;
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pBuffer[6] = (PayloadDataSize && bLastTPDU) ? X224_EOT : 0;
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}
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#endif // !defined(__X224_H)
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