BlinkenLib/BlinkenOutputWin.c (142b777) - BlinkenLib · BlinkenArea

BlinkenOutputWin.c

/* BlinkenLib Copyright 2004-2011 Stefan Schuermans <stefan@blinkenarea.org>
   Copyleft: GNU public license - http://www.gnu.org/copyleft/gpl.html a
   blinkenarea.org project */

#include <fcntl.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <winsock2.h>
#include <windows.h>

#include <BlinkenLib/BlinkenLib.h>

// get serial settings from text
static int serial_settings_parse(char *str)
{
  int baud, data, stop;
  char parity;
  int set = 0;

// split and parse settings string
  if (sscanf(str, "%i,%c,%i,%i", &baud, &parity, &data, &stop) != 4)
    return 0;

// baud rate
  if (baud != 300 &&
      baud != 600 &&
      baud != 1200 &&
      baud != 2400 &&
      baud != 4800 &&
      baud != 9600 &&
      baud != 19200 && baud != 38400 && baud != 57600 && baud != 115200) {
    printf("illegal baudrate: %d\n", baud);
    return 0;
  }
  // parity
  if (parity != 'n' && parity != 'N' &&
      parity != 'e' && parity != 'E' && parity != 'o' && parity != 'O') {
    printf("invalid parity: %c\n", parity);
    return 0;
  }
  // data bits
  if (data != 5 && data != 6 && data != 7 && data != 8) {
    printf("illegal number of data bits: %d\n", data);
    return 0;
  }
  // stop bits
  if (stop != 1 && stop == 2) {
    printf("illegal number of stop bits: %d\n", stop);
    return 0;
  }
  // success
  return 1;
}

// set serial settings for fd
static int serial_settings_set(HANDLE hDev, char *settings)
{
  DCB PortDcb;
  COMMTIMEOUTS CommTimeouts;

// set serial parameters
  if (!GetCommState(hDev, &PortDcb)) {
    printf("error getting device comm state: error %u\n", GetLastError());
    return 0;
  }
  if (!BuildCommDCB(hDev, &PortDcb)) {
    printf("error building comm state: error %u\n", GetLastError());
    return 0;
  }
  if (!SetCommState(hDev, &PortDcb)) {
    printf("error setting device comm state: error %u\n", GetLastError());
    return 0;
  }
  // set timeout parameters
  // maximum time between arrival of two characters: 10 ms
  // if this time elapses, read command will return even if buffer is not
  // filled completely
  CommTimeouts.ReadIntervalTimeout = 10;
  // disable read timeouts
  CommTimeouts.ReadTotalTimeoutConstant = 0;
  CommTimeouts.ReadTotalTimeoutMultiplier = 0;
  // disable write timeouts
  CommTimeouts.WriteTotalTimeoutConstant = 0;
  CommTimeouts.WriteTotalTimeoutMultiplier = 0;
  if (!SetCommTimeouts(hDev, &CommTimeouts)) {
    printf("error setting device timeout parameters: error %u\n",
           GetLastError());
    return 0;
  }
  // success
  return 1;
}

// receive frames from socket and output them
// hDev may be INVALID_HANDLE_VALUE for not doing anything with device
// returns error code (not for device-errors, 0 for success)
static int recv_and_out(SOCKET udpSocket, HANDLE hDev,
                        int *p_device_output_active,
                        unsigned int format_change,
                        unsigned int format_height, unsigned int format_width,
                        unsigned int format_channels,
                        unsigned int format_colors, etBlinkenProto proto,
                        int use_msecs, unsigned int msecs,
                        int is_serial_device)
{
  fd_set readFds, errFds;
  stBlinkenFrame *pFrame;
  char buffer[65536];   // 64kB is more than maximum UDP size
  int len, dev_eof;
  struct timeval timeout, *p_timeout;
  DWORD DevWrLen, Err, start, end;
  COMSTAT ComStat;

dev_eof = 0;
  for (;;) {
    // wait for next frame
    FD_ZERO(&readFds);
    FD_SET(udpSocket, &readFds);
    FD_ZERO(&errFds);
    FD_SET(udpSocket, &errFds);
    if (use_msecs)      // timeout
    {
      start = GetTickCount();
      timeout.tv_sec = msecs / 1000;
      timeout.tv_usec = msecs % 1000 * 1000;
      p_timeout = &timeout;
    } else
      p_timeout = NULL;
    if (select(0, &readFds, NULL, &errFds, p_timeout) < 0)      // error
    {
      printf("error during select: %s\n", strerror(errno));
      return -1;
    }
    // error on socket
    if (FD_ISSET(udpSocket, &errFds)) {
      printf("error on socket\n");
      return -1;
    }
    // received frame
    if (FD_ISSET(udpSocket, &readFds)) {
      // fetch data
      len = recv(udpSocket, buffer, sizeof(buffer), 0);
      if (len < 0) {
        printf("could not read from socket\n");
        return -1;
      }
      if (len == 0)
        return -1;

// get frame from data
      pFrame = BlinkenFrameFromNetwork(buffer, len, NULL);
      if (pFrame != NULL) {
        // change format
        if (format_change)
          BlinkenFrameResize(pFrame, format_height, format_width,
                             format_channels, format_colors - 1);

// create output data from frame
        len = BlinkenFrameToNetwork(pFrame, proto, buffer, sizeof(buffer));

// free frame
        BlinkenFrameFree(pFrame);

// output data to device
        if (hDev != INVALID_HANDLE_VALUE && len > 0) {
          if (!WriteFile(hDev, buffer, len, &DevWrLen, NULL)
              || (int)DevWrLen != len) {
            if (*p_device_output_active)
              printf("error writing to device: error %lu\n", GetLastError());
            break;
          }
          // message: output to device was restarted
          if (!*p_device_output_active)
            printf("restarted output to device...\n");
          *p_device_output_active = 1;
        }
      }
    }
    // get state of serial device
    if (hDev != INVALID_HANDLE_VALUE && is_serial_device) {
      ClearCommError(hDev, &Err, &ComStat);
      // reception error
      if (Err & (CE_BREAK | CE_FRAME | CE_OVERRUN | CE_RXOVER | CE_RXPARITY)) {
        if (*p_device_output_active)
          printf("error reading from device (comm err=%X)\n", Err);
        break;
      }
    }
    // using time limit
    if (use_msecs) {
      unsigned int msec;
      // get time elapsed
      end = GetTickCount();
      msec = end - start;
      // more than rest of timeout (or exact match)
      if (msec >= msecs)
        break;
      msecs -= msec;
    }

}     // for( ; ; )

return 0;
}

// open device and output frames
// returns error code (not for device-errors, 0 for success)
static int open_and_output(SOCKET udpSocket, char *device,
                           int *p_device_output_active,
                           int serial_settings_change, char *serial_settings,
                           unsigned int format_change,
                           unsigned int format_height,
                           unsigned int format_width,
                           unsigned int format_channels,
                           unsigned int format_colors, etBlinkenProto proto)
{
  HANDLE hDev;
  int err;

// open device
  hDev =
      CreateFile(device, GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING,
                 0, NULL);
  if (hDev == INVALID_HANDLE_VALUE) {
    if (*p_device_output_active)
      printf("could not open \"%s\": error %u\n", device, GetLastError());
    return 0;
  }
  // setup serial port
  if (serial_settings_change) {
    if (!serial_settings_set(hDev, serial_settings)) {
      if (*p_device_output_active)
        printf("could not set serial port to \"%s\"\n", serial_settings);
      CloseHandle(hDev);
      return 0;
    }
  }
  // receive frames and output to device
  err = recv_and_out(udpSocket, hDev, p_device_output_active,
                     format_change, format_height, format_width,
                     format_channels, format_colors, proto, 0, 0,
                     serial_settings_change);

// close device
  CloseHandle(hDev);

return err;
}

// open device and output frames in a loop
// returns error code (not for device-errors, 0 for success)
static int open_and_output_loop(SOCKET udpSocket, char *device,
                                int serial_settings_change,
                                char *serial_settings, int reopen_device,
                                unsigned int reopen_device_ms,
                                unsigned int format_change,
                                unsigned int format_height,
                                unsigned int format_width,
                                unsigned int format_channels,
                                unsigned int format_colors,
                                etBlinkenProto proto)
{
  int device_output_active, err;

printf("receiving frames and outputting them to \"%s\"...\n", device);
  device_output_active = 1;

for (;;) {

// try to open device and output frames
    err = open_and_output(udpSocket, device,
                          &device_output_active,
                          serial_settings_change, serial_settings,
                          format_change, format_height, format_width,
                          format_channels, format_colors, proto);
    if (err != 0 || !reopen_device)
      break;

// output to device stopped
    if (device_output_active)
      printf("output to device stopped...\n");
    device_output_active = 0;

// only fetch data from socket for a short time
    err = recv_and_out(udpSocket, INVALID_HANDLE_VALUE, &device_output_active,
                       format_change, format_height, format_width,
                       format_channels, format_colors, proto, 1,
                       reopen_device_ms, serial_settings_change);
    if (err != 0)
      break;

}

// output to device finshed
  if (device_output_active)
    printf("output to device finished...\n");
  device_output_active = 0;

return err;
}

int main(int argCnt, char **args)
{
  WSADATA WsaData;
  int i, bound;
  SOCKET udpSocket;
  char *serial_settings;
  etBlinkenProto proto;
  unsigned int format_change, format_height, format_width, format_channels,
      format_colors;
  unsigned int height, width, channels, colors, reopen_device_ms;
  int serial_settings_change, reopen_device, unblock;
  char txt[64];
  unsigned short port;
  struct sockaddr_in addr;
  char *device;

// print info
  printf("BlinkenLib - BlinkenOutput\n"
         "Copyright 2004-2011 Stefan Schuermans <stefan@blinkenarea.org>\n"
         "Copyleft: GNU public license - http://www.gnu.org/copyleft/gpl.html\n"
         "a blinkenarea.org project\n\n");

// print syntax
  if (argCnt <= 1) {
    printf("syntax: %s <parameter> [...]\n\n"
           "parameters:\n"
           "  -l [<ip>:]<port>\n"
           "     local address (defaults to 0.0.0.0:2323)\n"
           "     must occur before -r, may only occur once\n"
           "  -r <ip>[:<port>]\n"
           "     remote addess (defaults to every remote address)\n"
           "  -p [BLP|EBLP|MCUF]\n"
           "     protocol to output frames in (defaults to MCUF)\n"
           "  -f <width>x<height>-<channels>/<colors>\n"
           "     format to output frames in (defaults to no change)\n"
           "  -d <device>\n"
           "     device to output frames to (defaults to \"NUL\")\n"
           "  -s <baud-rate>,<parity>,<data-bits>,<stop-bits>\n"
           "     settings to use for serial devices (defaults to no change)\n"
           "  -o <milliseconds>\n"
           "     reopen device after short time on error (defaults to not reopen)\n"
           "\n", args[0]);
    return 0;
  }

WSAStartup(0x0101, &WsaData);

// create udp socket
  udpSocket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
  if (udpSocket == INVALID_SOCKET) {
    printf("cannot create UDP socket: error %lu\n", WSAGetLastError());
    WSACleanup();
    return -1;
  }
  bound = 0;

// unblock udp socket
  unblock = 1;
  if (ioctlsocket(udpSocket, FIONBIO, &unblock) == SOCKET_ERROR) {
    printf("cannot unblock UDP socket: error %lu\n", WSAGetLastError());
    closesocket(udpSocket);
    WSACleanup();
    return -1;
  }
  // process parameters
  proto = BlinkenProtoMcuf;
  format_change = 0;
  format_height = 0;
  format_width = 0;
  format_channels = 0;
  format_colors = 0;
  device = "NUL";
  serial_settings_change = 0;
  reopen_device = 0;
  for (i = 1; i < argCnt; i++) {

// local address
    if (strcmp(args[i], "-l") == 0) {
      if (i + 1 < argCnt) {
        i++;
        if (sscanf(args[i], "%32[0-9.]:%hu", txt, &port) == 2) {
          addr.sin_family = AF_INET;
          addr.sin_port = htons(port);
          addr.sin_addr.s_addr = inet_addr(txt);
          if (bind(udpSocket, (struct sockaddr *)&addr, sizeof(addr)) != 0)
            printf("could not set local address to \"%s\"\n", args[i]);
          else
            bound = 1;
        } else if (sscanf(args[i], "%hu", &port) == 1) {
          addr.sin_family = AF_INET;
          addr.sin_port = htons(port);
          addr.sin_addr.s_addr = htonl(INADDR_ANY);
          if (bind(udpSocket, (struct sockaddr *)&addr, sizeof(addr)) != 0)
            printf("could not set local address to \"%s\"\n", args[i]);
          else
            bound = 1;
        } else
          printf("invalid local address \"%s\"\n", args[i]);
      } else
        printf("missing local address for \"-l\"\n");
    }
    // remote address
    else if (strcmp(args[i], "-r") == 0) {
      if (i + 1 < argCnt) {
        i++;
        if (sscanf(args[i], "%32[0-9.]:%hu", txt, &port) == 2) {
          addr.sin_family = AF_INET;
          addr.sin_port = htons(port);
          addr.sin_addr.s_addr = inet_addr(txt);
          if (connect(udpSocket, (struct sockaddr *)&addr, sizeof(addr)) != 0)
            printf("could not set remote address to \"%s\"\n", args[i]);
        } else if (sscanf(args[i], "%32[0-9.]", txt) == 1) {
          addr.sin_family = AF_INET;
          addr.sin_port = htons(23230);
          addr.sin_addr.s_addr = inet_addr(txt);
          if (connect(udpSocket, (struct sockaddr *)&addr, sizeof(addr)) != 0)
            printf("could not set remote address to \"%s\"\n", args[i]);
        } else
          printf("invalid remote address \"%s\"\n", args[i]);
      } else
        printf("missing remote address for \"-r\"\n");
    }
    // protocol to output frames in
    else if (strcmp(args[i], "-p") == 0) {
      if (i + 1 < argCnt) {
        i++;
        if (stricmp(args[i], "BLP") == 0)
          proto = BlinkenProtoBlp;
        else if (stricmp(args[i], "EBLP") == 0)
          proto = BlinkenProtoEblp;
        else if (stricmp(args[i], "MCUF") == 0)
          proto = BlinkenProtoMcuf;
        else
          printf("unknown protocol \"%s\"\n", args[i]);
      } else
        printf("missing protocol for \"-p\"\n");
    }
    // format to output frames in
    else if (strcmp(args[i], "-f") == 0) {
      if (i + 1 < argCnt) {
        i++;
        if (sscanf
            (args[i], "%ux%u-%u/%u", &width, &height, &channels, &colors) == 4
            && width > 0 && width < 1000 && height > 0 && height < 1000
            && channels > 0 && channels < 20 && colors > 1 && colors <= 256) {
          format_change = 1;
          format_height = height;
          format_width = width;
          format_channels = channels;
          format_colors = colors;
        } else
          printf("invalid frame format \"%s\"\n", args[i]);
      } else
        printf("missing frame format for \"-r\"\n");
    }
    // device to output frames to
    else if (strcmp(args[i], "-d") == 0) {
      if (i + 1 < argCnt) {
        i++;
        device = args[i];
      } else
        printf("missing device name for \"-d\"\n");
    }
    // settings for serial output devices
    else if (strcmp(args[i], "-s") == 0) {
      if (i + 1 < argCnt) {
        i++;
        if (serial_settings_parse(args[i])) {
          serial_settings_change = 1;
          serial_settings = args[i];
        } else
          printf("invalid serial settings \"%s\"\n", args[i]);
      } else
        printf("missing serial settings for \"-s\"\n");
    }
    // reopen device on error after some time
    else if (strcmp(args[i], "-o") == 0) {
      if (i + 1 < argCnt) {
        i++;
        if (sscanf(args[i], "%u", &reopen_device_ms) == 1
            && reopen_device_ms >= 1)
          reopen_device = 1;
        else
          printf("invalid number of milliseconds \"%s\"\n", args[i]);
      } else
        printf("missing time for \"-o\"\n");
    }
    // unknown parameter
    else
      printf
          ("unknown parameter \"%s\", call without parameters to get help\n",
           args[i]);

}     // for( i ...

// try to bind if not bound
  if (!bound) {
    printf("no local address to receive frames on,\n"
           "  using default local address \"0.0.0.0:2323\"\n");
    addr.sin_family = AF_INET;
    addr.sin_port = htons(2323);
    addr.sin_addr.s_addr = htonl(INADDR_ANY);
    if (bind(udpSocket, (struct sockaddr *)&addr, sizeof(addr)) == 0)
      bound = 1;
    else {
      printf("could not set local address to \"0.0.0.0:2323\"\n");
      closesocket(udpSocket);
      return -1;
    }
  }
  // open device and output frames in a loop
  open_and_output_loop(udpSocket, device,
                       serial_settings_change, serial_settings,
                       reopen_device, reopen_device_ms,
                       format_change, format_height, format_width,
                       format_channels, format_colors, proto);

// close socket
  closesocket(udpSocket);

WSACleanup();
  return 0;
}

BlinkenLib

changed indenting to be more standard