Function cups_raster_io

cups/raster-stream.c:1373–1410

 */

static ssize_t				/* O - Bytes read/write or -1 */
cups_raster_io(cups_raster_t *r,	/* I - Raster stream */
               unsigned char *buf,	/* I - Buffer for read/write */
               size_t        bytes)	/* I - Number of bytes to read/write */
{
  ssize_t	count,			/* Number of bytes read/written */
		total;			/* Total bytes read/written */


  DEBUG_printf(("5cups_raster_io(r=%p, buf=%p, bytes=" CUPS_LLFMT ")", (void *)r, (void *)buf, CUPS_LLCAST bytes));

  for (total = 0; total < (ssize_t)bytes; total += count, buf += count)
  {
    count = (*r->iocb)(r->ctx, buf, bytes - (size_t)total);

    DEBUG_printf(("6cups_raster_io: count=%d, total=%d", (int)count, (int)total));
    if (count == 0)
      break;
//    {
//      DEBUG_puts("6cups_raster_io: Returning 0.");
//      return (0);
//    }
    else if (count < 0)
    {
      DEBUG_puts("6cups_raster_io: Returning -1 on error.");
      return (-1);
    }

#ifdef DEBUG
    r->iocount += (size_t)count;
#endif /* DEBUG */
  }

  DEBUG_printf(("6cups_raster_io: iocount=" CUPS_LLFMT, CUPS_LLCAST r->iocount));
  DEBUG_printf(("6cups_raster_io: Returning " CUPS_LLFMT ".", CUPS_LLCAST total));

  return (total);
}


/*