xyzmodem.c

u-boot-1.1.6 源码包

    }
  res = CYGACC_COMM_IF_GETC_TIMEOUT (*xyz.__chan, (char *) &xyz.cblk);
  ZM_DEBUG (zm_save (xyz.cblk));
  if (!res)
    {
      ZM_DEBUG (zm_dump (__LINE__));
      return xyzModem_timeout;
    }
  xyz.len = (c == SOH) ? 128 : 1024;
  xyz.bufp = xyz.pkt;
  for (i = 0; i < xyz.len; i++)
    {
      res = CYGACC_COMM_IF_GETC_TIMEOUT (*xyz.__chan, &c);
      ZM_DEBUG (zm_save (c));
      if (res)
	{
	  xyz.pkt[i] = c;
	}
      else
	{
	  ZM_DEBUG (zm_dump (__LINE__));
	  return xyzModem_timeout;
	}
    }
  res = CYGACC_COMM_IF_GETC_TIMEOUT (*xyz.__chan, (char *) &xyz.crc1);
  ZM_DEBUG (zm_save (xyz.crc1));
  if (!res)
    {
      ZM_DEBUG (zm_dump (__LINE__));
      return xyzModem_timeout;
    }
  if (xyz.crc_mode)
    {
      res = CYGACC_COMM_IF_GETC_TIMEOUT (*xyz.__chan, (char *) &xyz.crc2);
      ZM_DEBUG (zm_save (xyz.crc2));
      if (!res)
	{
	  ZM_DEBUG (zm_dump (__LINE__));
	  return xyzModem_timeout;
	}
    }
  ZM_DEBUG (zm_dump (__LINE__));
  /* Validate the message */
  if ((xyz.blk ^ xyz.cblk) != (unsigned char) 0xFF)
    {
      ZM_DEBUG (zm_dprintf
		("Framing error - blk: %x/%x/%x\n", xyz.blk, xyz.cblk,
		 (xyz.blk ^ xyz.cblk)));
      ZM_DEBUG (zm_dump_buf (xyz.pkt, xyz.len));
      xyzModem_flush ();
      return xyzModem_frame;
    }
  /* Verify checksum/CRC */
  if (xyz.crc_mode)
    {
      cksum = cyg_crc16 (xyz.pkt, xyz.len);
      if (cksum != ((xyz.crc1 << 8) | xyz.crc2))
	{
	  ZM_DEBUG (zm_dprintf ("CRC error - recvd: %02x%02x, computed: %x\n",
				xyz.crc1, xyz.crc2, cksum & 0xFFFF));
	  return xyzModem_cksum;
	}
    }
  else
    {
      cksum = 0;
      for (i = 0; i < xyz.len; i++)
	{
	  cksum += xyz.pkt[i];
	}
      if (xyz.crc1 != (cksum & 0xFF))
	{
	  ZM_DEBUG (zm_dprintf
		    ("Checksum error - recvd: %x, computed: %x\n", xyz.crc1,
		     cksum & 0xFF));
	  return xyzModem_cksum;
	}
    }
  /* If we get here, the message passes [structural] muster */
  return 0;
}

int
xyzModem_stream_open (connection_info_t * info, int *err)
{
#ifdef REDBOOT
  int console_chan;
#endif
  int stat = 0;
  int retries = xyzModem_MAX_RETRIES;
  int crc_retries = xyzModem_MAX_RETRIES_WITH_CRC;

/*    ZM_DEBUG(zm_out = zm_out_start); */
#ifdef xyzModem_zmodem
  if (info->mode == xyzModem_zmodem)
    {
      *err = xyzModem_noZmodem;
      return -1;
    }
#endif

#ifdef REDBOOT
  /* Set up the I/O channel.  Note: this allows for using a different port in the future */
  console_chan =
    CYGACC_CALL_IF_SET_CONSOLE_COMM
    (CYGNUM_CALL_IF_SET_COMM_ID_QUERY_CURRENT);
  if (info->chan >= 0)
    {
      CYGACC_CALL_IF_SET_CONSOLE_COMM (info->chan);
    }
  else
    {
      CYGACC_CALL_IF_SET_CONSOLE_COMM (console_chan);
    }
  xyz.__chan = CYGACC_CALL_IF_CONSOLE_PROCS ();

  CYGACC_CALL_IF_SET_CONSOLE_COMM (console_chan);
  CYGACC_COMM_IF_CONTROL (*xyz.__chan, __COMMCTL_SET_TIMEOUT,
			  xyzModem_CHAR_TIMEOUT);
#else
/* TODO: CHECK ! */
  int dummy;
  xyz.__chan = &dummy;
#endif
  xyz.len = 0;
  xyz.crc_mode = true;
  xyz.at_eof = false;
  xyz.tx_ack = false;
  xyz.mode = info->mode;
  xyz.total_retries = 0;
  xyz.total_SOH = 0;
  xyz.total_STX = 0;
  xyz.total_CAN = 0;
#ifdef USE_YMODEM_LENGTH
  xyz.read_length = 0;
  xyz.file_length = 0;
#endif

  CYGACC_COMM_IF_PUTC (*xyz.__chan, (xyz.crc_mode ? 'C' : NAK));

  if (xyz.mode == xyzModem_xmodem)
    {
      /* X-modem doesn't have an information header - exit here */
      xyz.next_blk = 1;
      return 0;
    }

  while (retries-- > 0)
    {
      stat = xyzModem_get_hdr ();
      if (stat == 0)
	{
	  /* Y-modem file information header */
	  if (xyz.blk == 0)
	    {
#ifdef USE_YMODEM_LENGTH
	      /* skip filename */
	      while (*xyz.bufp++);
	      /* get the length */
	      parse_num ((char *) xyz.bufp, &xyz.file_length, NULL, " ");
#endif
	      /* The rest of the file name data block quietly discarded */
	      xyz.tx_ack = true;
	    }
	  xyz.next_blk = 1;
	  xyz.len = 0;
	  return 0;
	}
      else if (stat == xyzModem_timeout)
	{
	  if (--crc_retries <= 0)
	    xyz.crc_mode = false;
	  CYGACC_CALL_IF_DELAY_US (5 * 100000);	/* Extra delay for startup */
	  CYGACC_COMM_IF_PUTC (*xyz.__chan, (xyz.crc_mode ? 'C' : NAK));
	  xyz.total_retries++;
	  ZM_DEBUG (zm_dprintf ("NAK (%d)\n", __LINE__));
	}
      if (stat == xyzModem_cancel)
	{
	  break;
	}
    }
  *err = stat;
  ZM_DEBUG (zm_flush ());
  return -1;
}

int
xyzModem_stream_read (char *buf, int size, int *err)
{
  int stat, total, len;
  int retries;

  total = 0;
  stat = xyzModem_cancel;
  /* Try and get 'size' bytes into the buffer */
  while (!xyz.at_eof && (size > 0))
    {
      if (xyz.len == 0)
	{
	  retries = xyzModem_MAX_RETRIES;
	  while (retries-- > 0)
	    {
	      stat = xyzModem_get_hdr ();
	      if (stat == 0)
		{
		  if (xyz.blk == xyz.next_blk)
		    {
		      xyz.tx_ack = true;
		      ZM_DEBUG (zm_dprintf
				("ACK block %d (%d)\n", xyz.blk, __LINE__));
		      xyz.next_blk = (xyz.next_blk + 1) & 0xFF;

#if defined(xyzModem_zmodem) || defined(USE_YMODEM_LENGTH)
		      if (xyz.mode == xyzModem_xmodem || xyz.file_length == 0)
			{
#else
		      if (1)
			{
#endif
			  /* Data blocks can be padded with ^Z (EOF) characters */
			  /* This code tries to detect and remove them */
			  if ((xyz.bufp[xyz.len - 1] == EOF) &&
			      (xyz.bufp[xyz.len - 2] == EOF) &&
			      (xyz.bufp[xyz.len - 3] == EOF))
			    {
			      while (xyz.len
				     && (xyz.bufp[xyz.len - 1] == EOF))
				{
				  xyz.len--;
				}
			    }
			}

#ifdef USE_YMODEM_LENGTH
		      /*
		       * See if accumulated length exceeds that of the file.
		       * If so, reduce size (i.e., cut out pad bytes)
		       * Only do this for Y-modem (and Z-modem should it ever
		       * be supported since it can fall back to Y-modem mode).
		       */
		      if (xyz.mode != xyzModem_xmodem && 0 != xyz.file_length)
			{
			  xyz.read_length += xyz.len;
			  if (xyz.read_length > xyz.file_length)
			    {
			      xyz.len -= (xyz.read_length - xyz.file_length);
			    }
			}
#endif
		      break;
		    }
		  else if (xyz.blk == ((xyz.next_blk - 1) & 0xFF))
		    {
		      /* Just re-ACK this so sender will get on with it */
		      CYGACC_COMM_IF_PUTC (*xyz.__chan, ACK);
		      continue;	/* Need new header */
		    }
		  else
		    {
		      stat = xyzModem_sequence;
		    }
		}
	      if (stat == xyzModem_cancel)
		{
		  break;
		}
	      if (stat == xyzModem_eof)
		{
		  CYGACC_COMM_IF_PUTC (*xyz.__chan, ACK);
		  ZM_DEBUG (zm_dprintf ("ACK (%d)\n", __LINE__));
		  if (xyz.mode == xyzModem_ymodem)
		    {
		      CYGACC_COMM_IF_PUTC (*xyz.__chan,
					   (xyz.crc_mode ? 'C' : NAK));
		      xyz.total_retries++;
		      ZM_DEBUG (zm_dprintf ("Reading Final Header\n"));
		      stat = xyzModem_get_hdr ();
		      CYGACC_COMM_IF_PUTC (*xyz.__chan, ACK);
		      ZM_DEBUG (zm_dprintf ("FINAL ACK (%d)\n", __LINE__));
		    }
		  xyz.at_eof = true;
		  break;
		}
	      CYGACC_COMM_IF_PUTC (*xyz.__chan, (xyz.crc_mode ? 'C' : NAK));
	      xyz.total_retries++;
	      ZM_DEBUG (zm_dprintf ("NAK (%d)\n", __LINE__));
	    }
	  if (stat < 0)
	    {
	      *err = stat;
	      xyz.len = -1;
	      return total;
	    }
	}
      /* Don't "read" data from the EOF protocol package */
      if (!xyz.at_eof)
	{
	  len = xyz.len;
	  if (size < len)
	    len = size;
	  memcpy (buf, xyz.bufp, len);
	  size -= len;
	  buf += len;
	  total += len;
	  xyz.len -= len;
	  xyz.bufp += len;
	}
    }
  return total;
}

void
xyzModem_stream_close (int *err)
{
  diag_printf
    ("xyzModem - %s mode, %d(SOH)/%d(STX)/%d(CAN) packets, %d retries\n",
     xyz.crc_mode ? "CRC" : "Cksum", xyz.total_SOH, xyz.total_STX,
     xyz.total_CAN, xyz.total_retries);
  ZM_DEBUG (zm_flush ());
}

/* Need to be able to clean out the input buffer, so have to take the */
/* getc */
void
xyzModem_stream_terminate (bool abort, int (*getc) (void))
{
  int c;

  if (abort)
    {
      ZM_DEBUG (zm_dprintf ("!!!! TRANSFER ABORT !!!!\n"));
      switch (xyz.mode)
	{
	case xyzModem_xmodem:
	case xyzModem_ymodem:
	  /* The X/YMODEM Spec seems to suggest that multiple CAN followed by an equal */
	  /* number of Backspaces is a friendly way to get the other end to abort. */
	  CYGACC_COMM_IF_PUTC (*xyz.__chan, CAN);
	  CYGACC_COMM_IF_PUTC (*xyz.__chan, CAN);
	  CYGACC_COMM_IF_PUTC (*xyz.__chan, CAN);
	  CYGACC_COMM_IF_PUTC (*xyz.__chan, CAN);
	  CYGACC_COMM_IF_PUTC (*xyz.__chan, BSP);
	  CYGACC_COMM_IF_PUTC (*xyz.__chan, BSP);
	  CYGACC_COMM_IF_PUTC (*xyz.__chan, BSP);
	  CYGACC_COMM_IF_PUTC (*xyz.__chan, BSP);
	  /* Now consume the rest of what's waiting on the line. */
	  ZM_DEBUG (zm_dprintf ("Flushing serial line.\n"));
	  xyzModem_flush ();
	  xyz.at_eof = true;
	  break;
#ifdef xyzModem_zmodem
	case xyzModem_zmodem:
	  /* Might support it some day I suppose. */
#endif
	  break;
	}
    }
  else
    {
      ZM_DEBUG (zm_dprintf ("Engaging cleanup mode...\n"));
      /*
       * Consume any trailing crap left in the inbuffer from
       * previous recieved blocks. Since very few files are an exact multiple
       * of the transfer block size, there will almost always be some gunk here.
       * If we don't eat it now, RedBoot will think the user typed it.
       */
      ZM_DEBUG (zm_dprintf ("Trailing gunk:\n"));
      while ((c = (*getc) ()) > -1);
      ZM_DEBUG (zm_dprintf ("\n"));
      /*
       * Make a small delay to give terminal programs like minicom
       * time to get control again after their file transfer program
       * exits.
       */
      CYGACC_CALL_IF_DELAY_US ((cyg_int32) 250000);
    }
}

char *
xyzModem_error (int err)
{
  switch (err)
    {
    case xyzModem_access:
      return "Can't access file";
      break;
    case xyzModem_noZmodem:
      return "Sorry, zModem not available yet";
      break;
    case xyzModem_timeout:
      return "Timed out";
      break;
    case xyzModem_eof:
      return "End of file";
      break;
    case xyzModem_cancel:
      return "Cancelled";
      break;
    case xyzModem_frame:
      return "Invalid framing";
      break;
    case xyzModem_cksum:
      return "CRC/checksum error";
      break;
    case xyzModem_sequence:
      return "Block sequence error";
      break;
    default:
      return "Unknown error";
      break;
    }
}

/*
 * RedBoot interface
 */
#if 0				/* SB */
GETC_IO_FUNCS (xyzModem_io, xyzModem_stream_open, xyzModem_stream_close,
	       xyzModem_stream_terminate, xyzModem_stream_read,
	       xyzModem_error);
RedBoot_load (xmodem, xyzModem_io, false, false, xyzModem_xmodem);
RedBoot_load (ymodem, xyzModem_io, false, false, xyzModem_ymodem);
#endif