/************************************************************************* * (C) 2010 AITNET ltd - Sofia/Bulgaria - * by Michael Pounov * * $Author: misho $ * $Id: aitpelco.c,v 1.4 2013/05/30 09:20:16 misho Exp $ * ************************************************************************** The ELWIX and AITNET software is distributed under the following terms: All of the documentation and software included in the ELWIX and AITNET Releases is copyrighted by ELWIX - Sofia/Bulgaria Copyright 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 by Michael Pounov . 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. 3. All advertising materials mentioning features or use of this software must display the following acknowledgement: This product includes software developed by Michael Pounov ELWIX - Embedded LightWeight unIX and its contributors. 4. Neither the name of AITNET nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY AITNET 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 REGENTS 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. */ #include "global.h" #include "aitpelco.h" static int pelco_Errno; static char pelco_Error[STRSIZ]; // // Error maintenance functions ... // // pelco_GetErrno() Get error code of last operation int pelco_GetErrno() { return pelco_Errno; } // pelco_GetError() Get error text of last operation const char * pelco_GetError() { return pelco_Error; } // pelco_SetErr() Set error to variables for internal use!!! void pelcoSetErr(int eno, char *estr, ...) { va_list lst; pelco_Errno = eno; memset(pelco_Error, 0, sizeof pelco_Error); va_start(lst, estr); vsnprintf(pelco_Error, sizeof pelco_Error, estr, lst); va_end(lst); } // ---------------------------------------------------------- /* * pelcoOpen() Open packet record for camera number with Pelco version D/P * @pelcoVer = Pelco protocol version Dd | Pp * @camNo = Packet for camera number address * return: NULL error, !=NULL ok, allocated memory for packet */ void * pelcoOpen(u_char pelcoVer, u_char camNo) { pelco_d_t *pd; pelco_p_t *pp; void *p = NULL; switch (pelcoVer) { case 'D': case 'd': if (camNo < FIRST_CAM_D) { pelcoSetErr(ENOEXEC, "unsupported camera number %d!\n", camNo); return NULL; } pd = malloc(sizeof(pelco_d_t)); if (!pd) { SETERR; return NULL; } else memset(pd, 0, sizeof(pelco_d_t)); pd->d_sync = VER_D_SYNC; pd->d_cam = camNo; p = pd; break; case 'P': case 'p': pp = malloc(sizeof(pelco_p_t)); if (!pp) { SETERR; return NULL; } else memset(pp, 0, sizeof(pelco_p_t)); pp->p_stx = VER_P_STX; pp->p_cam = !camNo ? camNo : camNo - 1; pp->p_etx = VER_P_ETX; p = pp; break; default: pelcoSetErr(ENOEXEC, "unsupported Pelco protocol version!\n"); } return p; } /* * pelcoClose() Close packet record and free memory * @p = Packet structure for close */ void pelcoClose(void * __restrict p) { if (p) free(p); } /* * pelcoLoad() Load packet from input buffer * @buffer = Pelco packet from input buffer * return: NULL error, !=NULL ok, allocated memory for packet */ void * pelcoLoad(u_char *buffer) { pelco_d_t *pd; pelco_p_t *pp; void *p = NULL; if (!buffer || !*buffer) { pelcoSetErr(EINVAL, "invalid argument!\n"); return NULL; } switch (pelco_GetVersion(buffer)) { case 'd': if (pelco_GetCamNo(buffer) < FIRST_CAM_D) { pelcoSetErr(ENOEXEC, "unsupported camera number %d!\n", pelco_GetCamNo(buffer)); return NULL; } pd = malloc(sizeof(pelco_d_t)); if (!pd) { SETERR; return NULL; } else memcpy(pd, buffer, sizeof(pelco_d_t)); p = pd; break; case 'p': pp = malloc(sizeof(pelco_p_t)); if (!pp) { SETERR; return NULL; } else memcpy(pp, buffer, sizeof(pelco_p_t)); p = pp; break; default: pelcoSetErr(ENOEXEC, "unsupported Pelco protocol version!\n"); } return p; } /* * pelcoAddCmdData() Add commands and datas for already opened packet * @p = Input Packet structure * @cmd[2] = Input Commands 1 & 2 * @data[2] = Input Data for commands 1 & 2 * return: 0xFF - error, 0 - ok */ u_char pelcoAddCmdData(void * __restrict p, u_char * __restrict cmd, u_char * __restrict data) { u_char ret = 0; pelco_d_t *pd = (pelco_d_t *) p; pelco_p_t *pp = (pelco_p_t *) p; u_char *ptr = p; if (!p || !*ptr) { pelcoSetErr(EINVAL, "invalid argument!\n"); return 0xFF; } switch (ptr[0]) { case VER_D_SYNC: if (ptr[1] < FIRST_CAM_D) { pelcoSetErr(ENOEXEC, "unsupported camera number %d!\n", ptr[1]); return 0xFF; } if (cmd) memcpy(&pd->d_cmd1, cmd, 2); if (data) memcpy(&pd->d_data, data, 2); pd->d_crc = crcPelco('d', p); break; case VER_P_STX: if (VER_P_ETX != ptr[6]) { pelcoSetErr(ENOEXEC, "Broken Pelco P packet!\n"); return 0xFF; } if (cmd) memcpy(&pp->p_cmd1, cmd, 2); if (data) memcpy(&pp->p_data, data, 2); pp->p_crc = crcPelco('p', p); break; default: pelcoSetErr(ENOEXEC, "Invalid protocol!\n"); return 0xFF; } return ret; } /* * pelcoGetCmdData() Get from packet commands and datas with verify packet * @p = Input Packet structure * @cmd[2] = Output Commands 1 & 2 * @data[2] = Output Data for commands 1 & 2 * return: 'd' - PelcoD, 'p' - PelcoP, 0 - unknown or bad packet */ u_char pelcoGetCmdData(void * __restrict p, u_char * __restrict cmd, u_char * __restrict data) { return pelco_GetCamCmdData(p, NULL, cmd, data); } /* * pelcoChkSum() Check ot Correct check sum in packet * @p = Input Packet structure * @correct = Calculate new check sum if incorrect !=0, if ==0 only check * return: 0xFF - bad packet, 1 invalid check sum, 0 check sum is correct. */ u_char pelcoChkSum(void * __restrict p, u_char correct) { u_char sum, *ptr = p; pelco_d_t *pd = (pelco_d_t *) p; pelco_p_t *pp = (pelco_p_t *) p; if (!p || !*ptr) { pelcoSetErr(EINVAL, "invalid argument!\n"); return 0xFF; } switch (ptr[0]) { case VER_D_SYNC: if (ptr[1] < FIRST_CAM_D) { pelcoSetErr(ENOEXEC, "unsupported camera number %d!\n", ptr[1]); return 0xFF; } sum = crcPelco('d', p); if (correct) pd->d_crc = sum; break; case VER_P_STX: if (VER_P_ETX != ptr[6]) { pelcoSetErr(ENOEXEC, "Broken Pelco P packet!\n"); return 0xFF; } sum = crcPelco('p', p); if (correct) pp->p_crc = sum; break; default: pelcoSetErr(ENOEXEC, "Invalid protocol!\n"); return 0xFF; } return sum; }