/***************************************************************************** ** ** ** COPYRIGHT (C) 2000, 2001 MKNET CORPORATION ** ** DEVELOPED FOR THE MK7100-BASED VFIR PCI CONTROLLER. ** ** ** *****************************************************************************/ /********************************************************************** Module Name: SIR.C Routines: NdisToSirPacket ComputeSirFCS ProcRXSir Comments: **********************************************************************/ #include "precomp.h" #include "protot.h" #pragma hdrstop // SIR only const USHORT fcsTable[256] = { 0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf, 0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7, 0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e, 0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876, 0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd, 0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5, 0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c, 0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974, 0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb, 0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3, 0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a, 0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72, 0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9, 0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1, 0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738, 0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70, 0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7, 0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff, 0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036, 0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e, 0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5, 0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd, 0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134, 0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c, 0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3, 0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb, 0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232, 0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a, 0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1, 0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9, 0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330, 0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78 }; ULONG __inline EscapeSlowIrData(PUCHAR Dest, UCHAR SourceByte) { switch (SourceByte){ case SIR_BOF: case SIR_EOF: case SIR_ESC: Dest[0] = SIR_ESC; Dest[1] = SourceByte ^ SIR_ESC_COMP; return 2; default: Dest[0] = SourceByte; return 1; } } //----------------------------------------------------------------------------- // Procedure: [NdisToSirPacket] //----------------------------------------------------------------------------- BOOLEAN NdisToSirPacket (PMK7_ADAPTER Adapter, PNDIS_PACKET Packet, UCHAR *irPacketBuf, UINT irPacketBufLen, UINT *irPacketLen ) { PNDIS_BUFFER CurrentBuffer, NextBuffer; UINT CurrentLength; PVOID VirtualAddress; PNDIS_BUFFER ndisBuf; UINT i, ndisPacketBytes = 0, I_fieldBytes, totalBytes = 0; UINT ndisPacketLen, numExtraBOFs; SIR_FCS_TYPE fcs; UCHAR nextChar; UCHAR *bufData; UINT bufLen; PNDIS_IRDA_PACKET_INFO packetInfo = GetPacketInfo(Packet); // Get the packet's entire length and its first NDIS buffer NdisQueryPacket(Packet, NULL, NULL, &ndisBuf, &ndisPacketLen); // Make sure that the packet is big enough to be legal. // It consists of an A, C, and variable-length I field. if (ndisPacketLen < ADDR_SIZE + CONTROL_SIZE){ // DBGERR(("packet too short in NdisToIrPacket (%d bytes)", ndisPacketLen)); return (FALSE); } else { I_fieldBytes = ndisPacketLen - ADDR_SIZE - CONTROL_SIZE; } // Make sure that we won't overwrite our contiguous buffer. // Make sure that the passed-in buffer can accomodate this packet's // data no matter how much it grows through adding ESC-sequences, etc. if (ndisPacketLen > MK7_MAXIMUM_PACKET_SIZE) { // The packet is too large // Tell the caller to retry with a packet size large // enough to get past this stage next time. //DBGERR(("Packet too large in NdisToIrPacket (%d=%xh bytes), MAX_IRDA_DATA_SIZE=%d, irPacketBufLen=%d.", ndisPacketLen, ndisPacketLen, MAX_IRDA_DATA_SIZE, irPacketBufLen)); *irPacketLen = ndisPacketLen; return (FALSE); } if (!ndisBuf) { // DBGERR(("No NDIS_BUFFER in NdisToIrPacket")); return (FALSE); } CurrentBuffer = ndisBuf; while (CurrentBuffer != NULL) { NdisQueryBufferSafe(CurrentBuffer, &VirtualAddress, &CurrentLength, 16); if (!VirtualAddress) { #if DBG DbgPrint("==> Throw Away Failed Packet\n\r"); #endif return (FALSE); } NdisGetNextBuffer(CurrentBuffer, &NextBuffer); CurrentBuffer = NextBuffer; } // NDIS requirement // NdisQueryBuffer(ndisBuf, (PVOID *)&bufData, &bufLen); NdisQueryBufferSafe(ndisBuf, (PVOID *)&bufData, &bufLen,16); /* * Now begin building the IR frame. * * This is the final format: * * extra BOFs ... * BOF (1) * NdisMediumIrda packet (what we get from NDIS): * Address (1) * Control (1) * FCS (2) * EOF (1) */ // Prepend BOFs (extra BOFs + 1 actual BOF) // 4.1.0 if ((Adapter->HwVersion==HW_VER_1) && (Adapter->CurrentSpeed <= MAX_SIR_SPEED)) numExtraBOFs = HW_VER_1_EBOFS; else numExtraBOFs = packetInfo->ExtraBOFs; if (numExtraBOFs > MAX_EXTRA_SIR_BOFS) { numExtraBOFs = MAX_EXTRA_SIR_BOFS; } for (i = totalBytes = 0; i < numExtraBOFs; i++) { *(SIR_BOF_TYPE *)(irPacketBuf+totalBytes) = SIR_EXTRA_BOF; totalBytes += SIR_EXTRA_BOF_SIZE; } *(SIR_BOF_TYPE *)(irPacketBuf+totalBytes) = SIR_BOF; totalBytes += SIR_BOF_SIZE; fcs = 0xffff; // Fill TX buff w/ I data & calculate FCS as we go for (i=0; i> 8) ^ fcsTable[(fcs ^ nextChar) & 0xff]; totalBytes += EscapeSlowIrData(&irPacketBuf[totalBytes], nextChar); if (--bufLen==0) { NdisGetNextBuffer(ndisBuf, &ndisBuf); if (ndisBuf) { // NDIS requriement // NdisQueryBuffer(ndisBuf, (PVOID *)&bufData, &bufLen); NdisQueryBufferSafe(ndisBuf, (PVOID *)&bufData, &bufLen,16); } else { bufData = NULL; } } } if (bufData != NULL) { // Packet was corrupt -- it misreported its size. // DBGERR(("Packet corrupt in NdisToIrPacket (buffer lengths don't add up to packet length).")); *irPacketLen = 0; return (FALSE); } fcs = ~fcs; // Put in the 16-bit FCS totalBytes += EscapeSlowIrData(&irPacketBuf[totalBytes], (UCHAR)(fcs&0xff)); totalBytes += EscapeSlowIrData(&irPacketBuf[totalBytes], (UCHAR)(fcs>>8)); // EOF *(SIR_EOF_TYPE *)&irPacketBuf[totalBytes] = SIR_EOF; totalBytes += SIR_EOF_SIZE; *irPacketLen = totalBytes; // DBGOUT(("... NdisToIrPacket converted %d-byte ndis pkt to %d-byte irda pkt:", ndisPacketLen, *irPacketLen)); return (TRUE); } //---------------------------------------------------------------------- // Procedure: [ComputeSirFCS] // //---------------------------------------------------------------------- USHORT ComputeSirFCS(UCHAR *data, UINT dataLen) { USHORT fcs = 0xffff; UINT i; // DBGOUT(("ComputeSirFCS() on %d-byte buffer.", dataLen)); for (i = 0; i < dataLen; i++){ fcs = (fcs >> 8) ^ fcsTable[(fcs ^ *data++) & 0xff]; } fcs = ~fcs; // DBGOUT(("ComputeFCS returning %d=0x%x.", (UINT)fcs, (UINT)fcs)); return (fcs); } //----------------------------------------------------------------------------- // Procedure: [ProcRXSir] // //----------------------------------------------------------------------------- BOOLEAN ProcRXSir(UCHAR *dBuff, UINT dCnt) { USHORT fcs; // FCS is not computed over the FCS field. Need to look into this. // (It seems when the original FCS is included in the calculation, // we should get GOOD_FCS for result.) fcs = ComputeSirFCS(dBuff, dCnt); if (fcs != GOOD_FCS) return (FALSE); return (TRUE); }