/* * Copyright (c) 2001 Tommy Bohlin * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ /* sir.c */ #include #include /********************************************************************** * Constants **********************************************************************/ static const char id_sir_framedevice[]="sir frame device"; static const char id_sir_inbuffer[]="sir inbuffer"; /********************************************************************** * Data structures **********************************************************************/ #define SIR_EXTRA_BOF 0xff #define SIR_BOF 0xc0 #define SIR_CE 0x7d #define SIR_EOF 0xc1 #define SIR_ESC_BIT 0x20 typedef struct SIRFrameDevice { FrameDevice frame; SerialDevice* serial; u_char* inBuf; int maxSize; int frameState; #define FRAME_OUTSIDE 0 #define FRAME_INSIDE 1 #define FRAME_ESCAPE 2 int inChars; int inFCS; int ebofs; } SIRFrameDevice; /********************************************************************** * CRC **********************************************************************/ static const int fcstab[] = { 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 }; static const int INITFCS=0xffff; static const int GOODFCS=0xf0b8; static int updateFCS(int fcs, int c) { return (fcs>>8)^fcstab[0xff&(fcs^c)]; } /********************************************************************** * SIR transmission **********************************************************************/ static void writeProtected(SerialDevice* sd, int c) { if(c==SIR_BOF || c==SIR_EOF || c==SIR_CE) { sd->putChar(sd,SIR_CE); sd->putChar(sd,SIR_ESC_BIT^c); } else { sd->putChar(sd,c); } } static void sendFrame(FrameDevice* fd, const void* buf0, int len) { u_char* buf=(u_char*)buf0; SIRFrameDevice* sfd=(SIRFrameDevice*)fd; SerialDevice* sd=sfd->serial; int i,ofcs=INITFCS; for(i=sfd->ebofs;i>0;i--) sd->putChar(sd,SIR_EXTRA_BOF); sd->putChar(sd,SIR_BOF); for(i=0;i>8)); sd->putChar(sd,SIR_EOF); } /********************************************************************** * SIR reception **********************************************************************/ static void timeoutListener(void* fd) { SIRFrameDevice* sfd=(SIRFrameDevice*)fd; if((sfd->frame.debug&FRAME_DEBUG_INPUT) && sfd->frameState!=FRAME_OUTSIDE) birda_log("input frame timeout\n"); sfd->frameState=FRAME_OUTSIDE; } static void status(SerialDevice* sd, int event) { SIRFrameDevice* sfd=(SIRFrameDevice*)sd->handle; if(event==SERIAL_INPUT_AVAILABLE && sfd->inBuf) { int c; while((c=sd->getChar(sd))!=SERIAL_INBUF_EMPTY) { switch(c) { case SIR_BOF: sfd->frameState=FRAME_INSIDE; sfd->inChars=0; sfd->inFCS=INITFCS; break; case SIR_EOF: if(sfd->frameState==FRAME_INSIDE && sfd->inChars>=4 && sfd->inFCS==GOODFCS) { if(sfd->frame.frame) sfd->frame.frame(&sfd->frame,sfd->inBuf,sfd->inChars-2); } else if((sfd->frame.debug&FRAME_DEBUG_INPUT) && sfd->frameState!=FRAME_OUTSIDE) { birda_log("malformed input frame\n"); } sfd->frameState=FRAME_OUTSIDE; break; case SIR_CE: if(sfd->frameState==FRAME_INSIDE) sfd->frameState=FRAME_ESCAPE; break; default: if(sfd->frameState!=FRAME_OUTSIDE) { if(sfd->frameState==FRAME_ESCAPE) { sfd->frameState=FRAME_INSIDE; c^=SIR_ESC_BIT; } if(sfd->inCharsmaxSize+2) { sfd->inBuf[sfd->inChars++]=c; sfd->inFCS=updateFCS(sfd->inFCS,c); } else { sfd->frameState=FRAME_OUTSIDE; if(sfd->frame.debug&FRAME_DEBUG_INPUT) birda_log("input frame overrun\n"); } } break; } if(sfd->frameState!=FRAME_OUTSIDE) evtSetTimer(10,timeoutListener,sfd); } } } /********************************************************************** * Miscellaneous **********************************************************************/ static int getSpeedMask(FrameDevice* fd) { SIRFrameDevice* sfd=(SIRFrameDevice*)fd; return sfd->serial->getSpeedMask(sfd->serial); } static int getMinTurnaroundMask(FrameDevice* fd) { SIRFrameDevice* sfd=(SIRFrameDevice*)fd; return sfd->serial->getMinTurnaroundMask(sfd->serial); } static int setParams(FrameDevice* fd, int baud, int ebofs, int maxSize) { SIRFrameDevice* sfd=(SIRFrameDevice*)fd; int delay=sfd->serial->setSpeed(sfd->serial,baud); sfd->ebofs=ebofs; if(sfd->maxSize!=maxSize) { sfd->maxSize=maxSize; if(sfd->inBuf) freeMem(sfd->inBuf); sfd->inBuf=sfd->maxSize ? allocMem(id_sir_inbuffer,maxSize+2) : 0; } sfd->frameState=FRAME_OUTSIDE; return delay; } static void resetParams(FrameDevice* fd) { SIRFrameDevice* sfd=(SIRFrameDevice*)fd; sfd->serial->setSpeed(sfd->serial,DEFAULT_SPEED); sfd->ebofs=DEFAULT_EBOFS; if(sfd->maxSize!=DEFAULT_SIZE) { sfd->maxSize=DEFAULT_SIZE; if(sfd->inBuf) freeMem(sfd->inBuf); sfd->inBuf=sfd->maxSize ? allocMem(id_sir_inbuffer,DEFAULT_SIZE+2) : 0; } sfd->frameState=FRAME_OUTSIDE; } static void sirClose(FrameDevice* fd) { SIRFrameDevice* sfd=(SIRFrameDevice*)fd; evtCancelTimer(timeoutListener,sfd); sfd->serial->handle=0; sfd->serial->status=0; if(sfd->inBuf) freeMem(sfd->inBuf); freeMem(sfd); } /********************************************************************** * External interface **********************************************************************/ FrameDevice* createSIRFrameDevice(SerialDevice* serial) { SIRFrameDevice* sfd=allocMem(id_sir_framedevice,sizeof(SIRFrameDevice)); sfd->frame.close=sirClose; sfd->frame.setParams=setParams; sfd->frame.resetParams=resetParams; sfd->frame.sendFrame=sendFrame; sfd->frame.getSpeedMask=getSpeedMask; sfd->frame.getMinTurnaroundMask=getMinTurnaroundMask; sfd->frame.debug=0; sfd->frame.handle=0; sfd->frame.frame=0; sfd->serial=serial; sfd->inBuf=0; sfd->maxSize=0; sfd->frameState=FRAME_OUTSIDE; sfd->ebofs=10; serial->handle=sfd; serial->status=status; return &sfd->frame; } #define ADDBYTE(x) \ if (ix < maxlen) \ dst[ix++] = (x); \ else \ goto bad #define ADDPROTECTED(c) \ if((c) == SIR_BOF || (c) == SIR_EOF || (c) == SIR_CE) { \ ADDBYTE(SIR_CE); \ ADDBYTE(SIR_ESC_BIT^(c)); \ } else { \ ADDBYTE(c); \ } int createSIRFrame(int ebofs, const u_char *src, int len, u_char *dst, int maxlen) { int i, ofcs = INITFCS; int ix = 0; for(i = ebofs; i > 0; i--) ADDBYTE(SIR_EXTRA_BOF); ADDBYTE(SIR_BOF); for(i = 0; i < len; i++) { int c = src[i]; ofcs = updateFCS(ofcs, c); ADDPROTECTED(c); } ofcs=~ofcs; ADDPROTECTED(0xff&ofcs); ADDPROTECTED(0xff&(ofcs>>8)); ADDBYTE(SIR_EOF); return ix; bad: birda_log("buffer overrun in createSIRFrame: in size=%d, max size=%d\n", len, maxlen); exit(-1); }