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leo.c

/* sane - Scanner Access Now Easy.

   Copyright (C) 2002-2003 Frank Zago (fzago at austin dot rr dot com)
   
   This file is part of the SANE package.
   
   This program is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public License as
   published by the Free Software Foundation; either version 2 of the
   License, or (at your option) any later version.
   
   This program is distributed in the hope that it will be useful, but
   WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place - Suite 330, Boston,
   MA 02111-1307, USA.
   
   As a special exception, the authors of SANE give permission for
   additional uses of the libraries contained in this release of SANE.
   
   The exception is that, if you link a SANE library with other files
   to produce an executable, this does not by itself cause the
   resulting executable to be covered by the GNU General Public
   License.  Your use of that executable is in no way restricted on
   account of linking the SANE library code into it.
   
   This exception does not, however, invalidate any other reasons why
   the executable file might be covered by the GNU General Public
   License.
   
   If you submit changes to SANE to the maintainers to be included in
   a subsequent release, you agree by submitting the changes that
   those changes may be distributed with this exception intact.
   
   If you write modifications of your own for SANE, it is your choice
   whether to permit this exception to apply to your modifications.
   If you do not wish that, delete this exception notice. 
*/

/*
   $Id: leo.c,v 1.9 2004/07/01 02:35:20 fzago-guest Exp $
   Across FS-1130
*/

/*--------------------------------------------------------------------------*/

#define BUILD 11              /* 2004/06/30 */
#define BACKEND_NAME leo
#define LEO_CONFIG_FILE "leo.conf"

/*--------------------------------------------------------------------------*/

#include "../include/sane/config.h"

#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>

#include "../include/sane/sane.h"
#include "../include/sane/sanei.h"
#include "../include/sane/saneopts.h"
#include "../include/sane/sanei_scsi.h"
#include "../include/sane/sanei_debug.h"
#include "../include/sane/sanei_backend.h"
#include "../include/sane/sanei_config.h"
#include "../include/lassert.h"

#include "leo.h"

/*--------------------------------------------------------------------------*/

/* Lists of possible scan modes. */
static SANE_String_Const scan_mode_list[] = {
  BLACK_WHITE_STR,
  GRAY_STR,
  COLOR_STR,
  NULL
};

/*--------------------------------------------------------------------------*/

/* Minimum and maximum width and length supported. */
static SANE_Range x_range = { SANE_FIX (0), SANE_FIX (8.5 * MM_PER_INCH), 0 };
static SANE_Range y_range =
  { SANE_FIX (0), SANE_FIX (11.5 * MM_PER_INCH), 0 };

/*--------------------------------------------------------------------------*/

static const SANE_Range gamma_range = {
  0,                    /* minimum */
  255,                        /* maximum */
  0                     /* quantization */
};

/*--------------------------------------------------------------------------*/

static SANE_String_Const halftone_pattern_list[] = {
  SANE_I18N ("None"),
  SANE_I18N ("Diamond"),
  SANE_I18N ("8x8 Coarse Fatting"),
  SANE_I18N ("8x8 Fine Fatting"),
  SANE_I18N ("8x8 Bayer"),
  SANE_I18N ("8x8 Vertical Line"),
  NULL
};

static const halftone_pattern_t *const halftone_pattern_val[] = {
  NULL,
  &haltfone_pattern_diamond,
  &haltfone_pattern_8x8_Coarse_Fatting,
  &haltfone_pattern_8x8_Fine_Fatting,
  &haltfone_pattern_8x8_Bayer,
  &haltfone_pattern_8x8_Vertical_Line
};

/*--------------------------------------------------------------------------*/

/* Define the supported scanners and their characteristics. */
static const struct scanners_supported scanners[] = {
  {6, "ACROSS  ", "                ",
   "Across", "FS-1130"},
  {6, "LEO     ", "LEOScan-S3      ",
   "Leo", "S3"},
  {6, "LEO", "LEOScan-S3",
   "Leo", "S3"},
  {6, "KYE CORP", "ColorPage-CS    ",
   "Genius", "FS1130"}
};

/*--------------------------------------------------------------------------*/

/* List of scanner attached. */
static Leo_Scanner *first_dev = NULL;
static int num_devices = 0;
static const SANE_Device **devlist = NULL;


/* Local functions. */

/* Display a buffer in the log. */
static void
hexdump (int level, const char *comment, unsigned char *p, int l)
{
  int i;
  char line[128];
  char *ptr;
  char asc_buf[17];
  char *asc_ptr;

  DBG (level, "%s\n", comment);

  ptr = line;
  *ptr = '\0';
  asc_ptr = asc_buf;
  *asc_ptr = '\0';

  for (i = 0; i < l; i++, p++)
    {
      if ((i % 16) == 0)
      {
        if (ptr != line)
          {
            DBG (level, "%s    %s\n", line, asc_buf);
            ptr = line;
            *ptr = '\0';
            asc_ptr = asc_buf;
            *asc_ptr = '\0';
          }
        sprintf (ptr, "%3.3d:", i);
        ptr += 4;
      }
      ptr += sprintf (ptr, " %2.2x", *p);
      if (*p >= 32 && *p <= 127)
      {
        asc_ptr += sprintf (asc_ptr, "%c", *p);
      }
      else
      {
        asc_ptr += sprintf (asc_ptr, ".");
      }
    }
  *ptr = '\0';
  DBG (level, "%s    %s\n", line, asc_buf);
}

/* Returns the length of the longest string, including the terminating
 * character. */
static size_t
max_string_size (SANE_String_Const strings[])
{
  size_t size, max_size = 0;
  int i;

  for (i = 0; strings[i]; ++i)
    {
      size = strlen (strings[i]) + 1;
      if (size > max_size)
      {
        max_size = size;
      }
    }

  return max_size;
}

/* Lookup a string list from one array and return its index. */
static int
get_string_list_index (SANE_String_Const list[], SANE_String_Const name)
{
  int index;

  index = 0;
  while (list[index] != NULL)
    {
      if (strcmp (list[index], name) == 0)
      {
        return (index);
      }
      index++;
    }

  DBG (DBG_error, "name %s not found in list\n", name);

  assert (0 == 1);            /* bug in backend, core dump */

  return (-1);
}

/* Initialize a scanner entry. Return an allocated scanner with some
 * preset values. */
static Leo_Scanner *
leo_init (void)
{
  Leo_Scanner *dev;

  DBG (DBG_proc, "leo_init: enter\n");

  /* Allocate a new scanner entry. */
  dev = malloc (sizeof (Leo_Scanner));
  if (dev == NULL)
    {
      return NULL;
    }

  memset (dev, 0, sizeof (Leo_Scanner));

  /* Allocate the buffer used to transfer the SCSI data. */
  dev->buffer_size = 64 * 1024;
  dev->buffer = malloc (dev->buffer_size);
  if (dev->buffer == NULL)
    {
      free (dev);
      return NULL;
    }

  /* Allocate a buffer to store the temporary image. */
  dev->image_size = 64 * 1024;      /* enough for 1 line at max res */
  dev->image = malloc (dev->image_size);
  if (dev->image == NULL)
    {
      free (dev->buffer);
      free (dev);
      return NULL;
    }

  dev->sfd = -1;

  DBG (DBG_proc, "leo_init: exit\n");

  return (dev);
}

/* Closes an open scanner. */
static void
leo_close (Leo_Scanner * dev)
{
  DBG (DBG_proc, "leo_close: enter\n");

  if (dev->sfd != -1)
    {
      sanei_scsi_close (dev->sfd);
      dev->sfd = -1;
    }

  DBG (DBG_proc, "leo_close: exit\n");
}

/* Frees the memory used by a scanner. */
static void
leo_free (Leo_Scanner * dev)
{
  int i;

  DBG (DBG_proc, "leo_free: enter\n");

  if (dev == NULL)
    return;

  leo_close (dev);
  if (dev->devicename)
    {
      free (dev->devicename);
    }
  if (dev->buffer)
    {
      free (dev->buffer);
    }
  if (dev->image)
    {
      free (dev->image);
    }

  for (i = 1; i < OPT_NUM_OPTIONS; i++)
    {
      if (dev->opt[i].type == SANE_TYPE_STRING && dev->val[i].s)
      {
        free (dev->val[i].s);
      }
    }

  free (dev);

  DBG (DBG_proc, "leo_free: exit\n");
}

/* Inquiry a device and returns TRUE if is supported. */
static int
leo_identify_scanner (Leo_Scanner * dev)
{
  CDB cdb;
  SANE_Status status;
  size_t size;
  int i;

  DBG (DBG_proc, "leo_identify_scanner: enter\n");

  size = 5;
  MKSCSI_INQUIRY (cdb, size);
  status = sanei_scsi_cmd2 (dev->sfd, cdb.data, cdb.len,
                      NULL, 0, dev->buffer, &size);

  if (status)
    {
      DBG (DBG_error,
         "leo_identify_scanner: inquiry failed with status %s\n",
         sane_strstatus (status));
      return (SANE_FALSE);
    }

  size = dev->buffer[4] + 5;  /* total length of the inquiry data */

  if (size < 36)
    {
      DBG (DBG_error,
         "leo_identify_scanner: not enough data to identify device\n");
      return (SANE_FALSE);
    }

  MKSCSI_INQUIRY (cdb, size);
  status = sanei_scsi_cmd2 (dev->sfd, cdb.data, cdb.len,
                      NULL, 0, dev->buffer, &size);

  if (status)
    {
      DBG (DBG_error,
         "leo_identify_scanner: inquiry failed with status %s\n",
         sane_strstatus (status));
      return (SANE_FALSE);
    }

  dev->scsi_type = dev->buffer[0] & 0x1f;
  memcpy (dev->scsi_vendor, dev->buffer + 0x08, 0x08);
  dev->scsi_vendor[0x08] = 0;
  memcpy (dev->scsi_product, dev->buffer + 0x10, 0x010);
  dev->scsi_product[0x10] = 0;
  memcpy (dev->scsi_version, dev->buffer + 0x20, 0x04);
  dev->scsi_version[0x04] = 0;

  DBG (DBG_info, "device is \"%s\" \"%s\" \"%s\"\n",
       dev->scsi_vendor, dev->scsi_product, dev->scsi_version);

  /* Lookup through the supported scanners table to find if this
   * backend supports that one. */
  for (i = 0; i < NELEMS (scanners); i++)
    {
      if (dev->scsi_type == scanners[i].scsi_type &&
        strcmp (dev->scsi_vendor, scanners[i].scsi_vendor) == 0 &&
        strcmp (dev->scsi_product, scanners[i].scsi_product) == 0)
      {

        DBG (DBG_error, "leo_identify_scanner: scanner supported\n");

        /* Get the full inquiry, since that scanner does not fill
           the length correctly. */
        size = 0x30;
        MKSCSI_INQUIRY (cdb, size);
        status = sanei_scsi_cmd2 (dev->sfd, cdb.data, cdb.len,
                            NULL, 0, dev->buffer, &size);
        if (status != SANE_STATUS_GOOD)
          {
            return (SANE_FALSE);
          }

        hexdump (DBG_info2, "inquiry", dev->buffer, size);

        dev->def = &(scanners[i]);
        dev->res_range.min = 1;
        dev->res_range.max = B16TOI (&dev->buffer[42]);

        dev->x_resolution_max = B16TOI (&dev->buffer[40]);
        dev->y_resolution_max = B16TOI (&dev->buffer[42]);


        return (SANE_TRUE);
      }
    }

  DBG (DBG_proc, "leo_identify_scanner: exit, device not supported\n");

  return (SANE_FALSE);
}

/* SCSI sense handler. Callback for SANE. */
static SANE_Status
leo_sense_handler (int scsi_fd, unsigned char *result, void *arg)
{
  int asc, ascq, sensekey;
  int len;

  DBG (DBG_proc, "leo_sense_handler (scsi_fd = %d)\n", scsi_fd);

  arg = arg;                  /* silence gcc */

  sensekey = get_RS_sense_key (result);
  len = 7 + get_RS_additional_length (result);

  hexdump (DBG_info2, "sense", result, len);

  if (get_RS_error_code (result) != 0x70)
    {
      DBG (DBG_error,
         "leo_sense_handler: invalid sense key error code (%d)\n",
         get_RS_error_code (result));

      return SANE_STATUS_IO_ERROR;
    }

  if (get_RS_ILI (result) != 0)
    {
      DBG (DBG_sense, "leo_sense_handler: short read\n");
    }

  if (len < 14)
    {
      DBG (DBG_error, "leo_sense_handler: sense too short, no ASC/ASCQ\n");

      return SANE_STATUS_IO_ERROR;
    }

  asc = get_RS_ASC (result);
  ascq = get_RS_ASCQ (result);

  DBG (DBG_sense, "leo_sense_handler: sense=%d, ASC/ASCQ=%02x%02x\n",
       sensekey, asc, ascq);

  switch (sensekey)
    {
    case 0x00:                /* no sense */
    case 0x02:                /* not ready */
    case 0x03:                /* medium error */
    case 0x05:
    case 0x06:
      break;
    }

  DBG (DBG_sense,
       "leo_sense_handler: unknown error condition. Please report it to the backend maintainer\n");

  return SANE_STATUS_IO_ERROR;
}

/* Set a window. */
static SANE_Status
leo_set_window (Leo_Scanner * dev)
{
  size_t size;
  CDB cdb;
  unsigned char window[48];
  SANE_Status status;

  DBG (DBG_proc, "leo_set_window: enter\n");

  size = sizeof (window);
  MKSCSI_SET_WINDOW (cdb, size);

  memset (window, 0, size);

  /* size of the windows descriptor block */
  window[7] = sizeof (window) - 8;
  window[1] = sizeof (window) - 2;

  /* X and Y resolution */
  Ito16 (dev->x_resolution, &window[10]);
  Ito16 (dev->y_resolution, &window[12]);

  /* Upper Left (X,Y) */
  Ito32 (dev->x_tl, &window[14]);
  Ito32 (dev->y_tl, &window[18]);

  /* Width and length */
  Ito32 (dev->width, &window[22]);
  Ito32 (dev->length, &window[26]);


  /* Image Composition */
  switch (dev->scan_mode)
    {
    case LEO_BW:
      window[33] = 0x00;
      break;
    case LEO_HALFTONE:
      window[33] = 0x01;
      break;
    case LEO_GRAYSCALE:
      window[33] = 0x02;
      break;
    case LEO_COLOR:
      window[33] = 0x05;
      break;
    }

  /* Depth */
  window[34] = dev->depth;

  /* Unknown - invariants */
  window[31] = 0x80;
  window[43] = 0x01;

  hexdump (DBG_info2, "windows", window, sizeof (window));

  status = sanei_scsi_cmd2 (dev->sfd, cdb.data, cdb.len,
                      window, sizeof (window), NULL, NULL);

  DBG (DBG_proc, "leo_set_window: exit, status=%d\n", status);

  return status;
}

/* Read the size of the scan. */
static SANE_Status
leo_get_scan_size (Leo_Scanner * dev)
{
  size_t size;
  CDB cdb;
  SANE_Status status;

  DBG (DBG_proc, "leo_get_scan_size: enter\n");

  size = 0x10;
  MKSCSI_GET_DATA_BUFFER_STATUS (cdb, 1, size);
  hexdump (DBG_info2, "CDB:", cdb.data, cdb.len);
  status = sanei_scsi_cmd2 (dev->sfd, cdb.data, cdb.len,
                      NULL, 0, dev->buffer, &size);

  if (size != 0x10)
    {
      DBG (DBG_error,
         "leo_get_scan_size: GET DATA BUFFER STATUS returned an invalid size (%ld)\n",
         (long) size);
      return SANE_STATUS_IO_ERROR;
    }

  hexdump (DBG_info2, "leo_get_scan_size return", dev->buffer, size);


  dev->params.pixels_per_line = B16TOI (&dev->buffer[14]);

  /* The number of lines if the number of lines left plus the number
   * of lines already waiting in the buffer. */
  dev->params.lines = B16TOI (&dev->buffer[12]) +
    (B24TOI (&dev->buffer[9]) / dev->params.bytes_per_line);

  switch (dev->scan_mode)
    {
    case LEO_BW:
    case LEO_HALFTONE:
      dev->params.pixels_per_line &= ~0x7;
      dev->params.bytes_per_line = dev->params.pixels_per_line / 8;
      break;
    case LEO_GRAYSCALE:
      dev->params.bytes_per_line = dev->params.pixels_per_line;
      break;
    case LEO_COLOR:
      dev->params.bytes_per_line = dev->params.pixels_per_line * 3;
      break;
    }

  DBG (DBG_proc, "leo_get_scan_size: exit, status=%d\n", status);

  DBG (DBG_proc, "lines=%d, bpl=%d\n", dev->params.lines,
       dev->params.bytes_per_line);

  return (status);
}

/* Return the number of byte that can be read. */
static SANE_Status
get_filled_data_length (Leo_Scanner * dev, size_t * to_read)
{
  size_t size;
  CDB cdb;
  SANE_Status status;

  DBG (DBG_proc, "get_filled_data_length: enter\n");

  *to_read = 0;

  size = 0x10;
  MKSCSI_GET_DATA_BUFFER_STATUS (cdb, 1, size);
  status = sanei_scsi_cmd2 (dev->sfd, cdb.data, cdb.len,
                      NULL, 0, dev->buffer, &size);

  if (size != 0x10)
    {
      DBG (DBG_error,
         "get_filled_data_length: GET DATA BUFFER STATUS returned an invalid size (%ld)\n",
         (long) size);
      return SANE_STATUS_IO_ERROR;
    }

  hexdump (DBG_info2, "get_filled_data_length return", dev->buffer, size);

  *to_read = B24TOI (&dev->buffer[9]);

  DBG (DBG_info, "get_filled_data_length: to read = %ld\n", (long) *to_read);

  DBG (DBG_proc, "get_filled_data_length: exit, status=%d\n", status);

  return (status);
}

/* Start a scan. */
static SANE_Status
leo_scan (Leo_Scanner * dev)
{
  CDB cdb;
  SANE_Status status;

  DBG (DBG_proc, "leo_scan: enter\n");

  MKSCSI_SCAN (cdb);

  status = sanei_scsi_cmd2 (dev->sfd, cdb.data, cdb.len, NULL, 0, NULL, NULL);

  DBG (DBG_proc, "leo_scan: exit, status=%d\n", status);

  return status;
}

/* Attach a scanner to this backend. */
static SANE_Status
attach_scanner (const char *devicename, Leo_Scanner ** devp)
{
  Leo_Scanner *dev;
  int sfd;

  DBG (DBG_sane_proc, "attach_scanner: %s\n", devicename);

  if (devp)
    *devp = NULL;

  /* Check if we know this device name. */
  for (dev = first_dev; dev; dev = dev->next)
    {
      if (strcmp (dev->sane.name, devicename) == 0)
      {
        if (devp)
          {
            *devp = dev;
          }
        DBG (DBG_info, "device is already known\n");
        return SANE_STATUS_GOOD;
      }
    }

  /* Allocate a new scanner entry. */
  dev = leo_init ();
  if (dev == NULL)
    {
      DBG (DBG_error, "ERROR: not enough memory\n");
      return SANE_STATUS_NO_MEM;
    }

  DBG (DBG_info, "attach_scanner: opening %s\n", devicename);

  if (sanei_scsi_open (devicename, &sfd, leo_sense_handler, dev) != 0)
    {
      DBG (DBG_error, "ERROR: attach_scanner: open failed\n");
      leo_free (dev);
      return SANE_STATUS_INVAL;
    }

  /* Fill some scanner specific values. */
  dev->devicename = strdup (devicename);
  dev->sfd = sfd;

  /* Now, check that it is a scanner we support. */
  if (leo_identify_scanner (dev) == SANE_FALSE)
    {
      DBG (DBG_error,
         "ERROR: attach_scanner: scanner-identification failed\n");
      leo_free (dev);
      return SANE_STATUS_INVAL;
    }

  leo_close (dev);

  /* Set the default options for that scanner. */
  dev->sane.name = dev->devicename;
  dev->sane.vendor = dev->def->real_vendor;
  dev->sane.model = dev->def->real_product;
  dev->sane.type = "flatbed scanner";

  /* Link the scanner with the others. */
  dev->next = first_dev;
  first_dev = dev;

  if (devp)
    {
      *devp = dev;
    }

  num_devices++;

  DBG (DBG_proc, "attach_scanner: exit\n");

  return SANE_STATUS_GOOD;
}

static SANE_Status
attach_one (const char *dev)
{
  attach_scanner (dev, NULL);
  return SANE_STATUS_GOOD;
}

/* Reset the options for that scanner. */
static void
leo_init_options (Leo_Scanner * dev)
{
  int i;

  /* Pre-initialize the options. */
  memset (dev->opt, 0, sizeof (dev->opt));
  memset (dev->val, 0, sizeof (dev->val));

  for (i = 0; i < OPT_NUM_OPTIONS; ++i)
    {
      dev->opt[i].size = sizeof (SANE_Word);
      dev->opt[i].cap = SANE_CAP_SOFT_SELECT | SANE_CAP_SOFT_DETECT;
    }

  /* Number of options. */
  dev->opt[OPT_NUM_OPTS].name = "";
  dev->opt[OPT_NUM_OPTS].title = SANE_TITLE_NUM_OPTIONS;
  dev->opt[OPT_NUM_OPTS].desc = SANE_DESC_NUM_OPTIONS;
  dev->opt[OPT_NUM_OPTS].type = SANE_TYPE_INT;
  dev->opt[OPT_NUM_OPTS].cap = SANE_CAP_SOFT_DETECT;
  dev->val[OPT_NUM_OPTS].w = OPT_NUM_OPTIONS;

  /* Mode group */
  dev->opt[OPT_MODE_GROUP].title = SANE_I18N ("Scan mode");
  dev->opt[OPT_MODE_GROUP].desc = "";     /* not valid for a group */
  dev->opt[OPT_MODE_GROUP].type = SANE_TYPE_GROUP;
  dev->opt[OPT_MODE_GROUP].cap = 0;
  dev->opt[OPT_MODE_GROUP].size = 0;
  dev->opt[OPT_MODE_GROUP].constraint_type = SANE_CONSTRAINT_NONE;

  /* Scanner supported modes */
  dev->opt[OPT_MODE].name = SANE_NAME_SCAN_MODE;
  dev->opt[OPT_MODE].title = SANE_TITLE_SCAN_MODE;
  dev->opt[OPT_MODE].desc = SANE_DESC_SCAN_MODE;
  dev->opt[OPT_MODE].type = SANE_TYPE_STRING;
  dev->opt[OPT_MODE].size = max_string_size (scan_mode_list);
  dev->opt[OPT_MODE].constraint_type = SANE_CONSTRAINT_STRING_LIST;
  dev->opt[OPT_MODE].constraint.string_list = scan_mode_list;
  dev->val[OPT_MODE].s = (SANE_Char *) strdup ("");   /* will be set later */

  /* X and Y resolution */
  dev->opt[OPT_RESOLUTION].name = SANE_NAME_SCAN_RESOLUTION;
  dev->opt[OPT_RESOLUTION].title = SANE_TITLE_SCAN_RESOLUTION;
  dev->opt[OPT_RESOLUTION].desc = SANE_DESC_SCAN_RESOLUTION;
  dev->opt[OPT_RESOLUTION].type = SANE_TYPE_INT;
  dev->opt[OPT_RESOLUTION].unit = SANE_UNIT_DPI;
  dev->opt[OPT_RESOLUTION].constraint_type = SANE_CONSTRAINT_RANGE;
  dev->opt[OPT_RESOLUTION].constraint.range = &dev->res_range;
  dev->val[OPT_RESOLUTION].w = dev->res_range.max / 2;

  /* Halftone pattern */
  dev->opt[OPT_HALFTONE_PATTERN].name = SANE_NAME_HALFTONE_PATTERN;
  dev->opt[OPT_HALFTONE_PATTERN].title = SANE_TITLE_HALFTONE_PATTERN;
  dev->opt[OPT_HALFTONE_PATTERN].desc = SANE_DESC_HALFTONE_PATTERN;
  dev->opt[OPT_HALFTONE_PATTERN].type = SANE_TYPE_STRING;
  dev->opt[OPT_HALFTONE_PATTERN].size =
    max_string_size (halftone_pattern_list);
  dev->opt[OPT_HALFTONE_PATTERN].cap |= SANE_CAP_INACTIVE;
  dev->opt[OPT_HALFTONE_PATTERN].constraint_type =
    SANE_CONSTRAINT_STRING_LIST;
  dev->opt[OPT_HALFTONE_PATTERN].constraint.string_list =
    halftone_pattern_list;
  dev->val[OPT_HALFTONE_PATTERN].s = strdup (halftone_pattern_list[0]);

  /* Geometry group */
  dev->opt[OPT_GEOMETRY_GROUP].title = SANE_I18N ("Geometry");
  dev->opt[OPT_GEOMETRY_GROUP].desc = ""; /* not valid for a group */
  dev->opt[OPT_GEOMETRY_GROUP].type = SANE_TYPE_GROUP;
  dev->opt[OPT_GEOMETRY_GROUP].cap = 0;
  dev->opt[OPT_GEOMETRY_GROUP].size = 0;
  dev->opt[OPT_GEOMETRY_GROUP].constraint_type = SANE_CONSTRAINT_NONE;

  /* Upper left X */
  dev->opt[OPT_TL_X].name = SANE_NAME_SCAN_TL_X;
  dev->opt[OPT_TL_X].title = SANE_TITLE_SCAN_TL_X;
  dev->opt[OPT_TL_X].desc = SANE_DESC_SCAN_TL_X;
  dev->opt[OPT_TL_X].type = SANE_TYPE_FIXED;
  dev->opt[OPT_TL_X].unit = SANE_UNIT_MM;
  dev->opt[OPT_TL_X].constraint_type = SANE_CONSTRAINT_RANGE;
  dev->opt[OPT_TL_X].constraint.range = &x_range;
  dev->val[OPT_TL_X].w = x_range.min;

  /* Upper left Y */
  dev->opt[OPT_TL_Y].name = SANE_NAME_SCAN_TL_Y;
  dev->opt[OPT_TL_Y].title = SANE_TITLE_SCAN_TL_Y;
  dev->opt[OPT_TL_Y].desc = SANE_DESC_SCAN_TL_Y;
  dev->opt[OPT_TL_Y].type = SANE_TYPE_FIXED;
  dev->opt[OPT_TL_Y].unit = SANE_UNIT_MM;
  dev->opt[OPT_TL_Y].constraint_type = SANE_CONSTRAINT_RANGE;
  dev->opt[OPT_TL_Y].constraint.range = &y_range;
  dev->val[OPT_TL_Y].w = y_range.min;

  /* Bottom-right x */
  dev->opt[OPT_BR_X].name = SANE_NAME_SCAN_BR_X;
  dev->opt[OPT_BR_X].title = SANE_TITLE_SCAN_BR_X;
  dev->opt[OPT_BR_X].desc = SANE_DESC_SCAN_BR_X;
  dev->opt[OPT_BR_X].type = SANE_TYPE_FIXED;
  dev->opt[OPT_BR_X].unit = SANE_UNIT_MM;
  dev->opt[OPT_BR_X].constraint_type = SANE_CONSTRAINT_RANGE;
  dev->opt[OPT_BR_X].constraint.range = &x_range;
  dev->val[OPT_BR_X].w = x_range.max;

  /* Bottom-right y */
  dev->opt[OPT_BR_Y].name = SANE_NAME_SCAN_BR_Y;
  dev->opt[OPT_BR_Y].title = SANE_TITLE_SCAN_BR_Y;
  dev->opt[OPT_BR_Y].desc = SANE_DESC_SCAN_BR_Y;
  dev->opt[OPT_BR_Y].type = SANE_TYPE_FIXED;
  dev->opt[OPT_BR_Y].unit = SANE_UNIT_MM;
  dev->opt[OPT_BR_Y].constraint_type = SANE_CONSTRAINT_RANGE;
  dev->opt[OPT_BR_Y].constraint.range = &y_range;
  dev->val[OPT_BR_Y].w = y_range.max;

  /* Enhancement group */
  dev->opt[OPT_ENHANCEMENT_GROUP].title = SANE_I18N ("Enhancement");
  dev->opt[OPT_ENHANCEMENT_GROUP].desc = "";    /* not valid for a group */
  dev->opt[OPT_ENHANCEMENT_GROUP].type = SANE_TYPE_GROUP;
  dev->opt[OPT_ENHANCEMENT_GROUP].cap = SANE_CAP_ADVANCED;
  dev->opt[OPT_ENHANCEMENT_GROUP].size = 0;
  dev->opt[OPT_ENHANCEMENT_GROUP].constraint_type = SANE_CONSTRAINT_NONE;

  /* custom-gamma table */
  dev->opt[OPT_CUSTOM_GAMMA].name = SANE_NAME_CUSTOM_GAMMA;
  dev->opt[OPT_CUSTOM_GAMMA].title = SANE_TITLE_CUSTOM_GAMMA;
  dev->opt[OPT_CUSTOM_GAMMA].desc = SANE_DESC_CUSTOM_GAMMA;
  dev->opt[OPT_CUSTOM_GAMMA].type = SANE_TYPE_BOOL;
  dev->opt[OPT_CUSTOM_GAMMA].cap |= SANE_CAP_INACTIVE;
  dev->val[OPT_CUSTOM_GAMMA].w = SANE_FALSE;

  /* red gamma vector */
  dev->opt[OPT_GAMMA_VECTOR_R].name = SANE_NAME_GAMMA_VECTOR_R;
  dev->opt[OPT_GAMMA_VECTOR_R].title = SANE_TITLE_GAMMA_VECTOR_R;
  dev->opt[OPT_GAMMA_VECTOR_R].desc = SANE_DESC_GAMMA_VECTOR_R;
  dev->opt[OPT_GAMMA_VECTOR_R].type = SANE_TYPE_INT;
  dev->opt[OPT_GAMMA_VECTOR_R].cap |= SANE_CAP_INACTIVE;
  dev->opt[OPT_GAMMA_VECTOR_R].unit = SANE_UNIT_NONE;
  dev->opt[OPT_GAMMA_VECTOR_R].size = GAMMA_LENGTH * sizeof (SANE_Word);
  dev->opt[OPT_GAMMA_VECTOR_R].constraint_type = SANE_CONSTRAINT_RANGE;
  dev->opt[OPT_GAMMA_VECTOR_R].constraint.range = &gamma_range;
  dev->val[OPT_GAMMA_VECTOR_R].wa = dev->gamma_R;

  /* green gamma vector */
  dev->opt[OPT_GAMMA_VECTOR_G].name = SANE_NAME_GAMMA_VECTOR_G;
  dev->opt[OPT_GAMMA_VECTOR_G].title = SANE_TITLE_GAMMA_VECTOR_G;
  dev->opt[OPT_GAMMA_VECTOR_G].desc = SANE_DESC_GAMMA_VECTOR_G;
  dev->opt[OPT_GAMMA_VECTOR_G].type = SANE_TYPE_INT;
  dev->opt[OPT_GAMMA_VECTOR_G].cap |= SANE_CAP_INACTIVE;
  dev->opt[OPT_GAMMA_VECTOR_G].unit = SANE_UNIT_NONE;
  dev->opt[OPT_GAMMA_VECTOR_G].size = GAMMA_LENGTH * sizeof (SANE_Word);
  dev->opt[OPT_GAMMA_VECTOR_G].constraint_type = SANE_CONSTRAINT_RANGE;
  dev->opt[OPT_GAMMA_VECTOR_G].constraint.range = &gamma_range;
  dev->val[OPT_GAMMA_VECTOR_G].wa = dev->gamma_G;

  /* blue gamma vector */
  dev->opt[OPT_GAMMA_VECTOR_B].name = SANE_NAME_GAMMA_VECTOR_B;
  dev->opt[OPT_GAMMA_VECTOR_B].title = SANE_TITLE_GAMMA_VECTOR_B;
  dev->opt[OPT_GAMMA_VECTOR_B].desc = SANE_DESC_GAMMA_VECTOR_B;
  dev->opt[OPT_GAMMA_VECTOR_B].type = SANE_TYPE_INT;
  dev->opt[OPT_GAMMA_VECTOR_B].cap |= SANE_CAP_INACTIVE;
  dev->opt[OPT_GAMMA_VECTOR_B].unit = SANE_UNIT_NONE;
  dev->opt[OPT_GAMMA_VECTOR_B].size = GAMMA_LENGTH * sizeof (SANE_Word);
  dev->opt[OPT_GAMMA_VECTOR_B].constraint_type = SANE_CONSTRAINT_RANGE;
  dev->opt[OPT_GAMMA_VECTOR_B].constraint.range = &gamma_range;
  dev->val[OPT_GAMMA_VECTOR_B].wa = dev->gamma_B;

  /* grayscale gamma vector */
  dev->opt[OPT_GAMMA_VECTOR_GRAY].name = SANE_NAME_GAMMA_VECTOR;
  dev->opt[OPT_GAMMA_VECTOR_GRAY].title = SANE_TITLE_GAMMA_VECTOR;
  dev->opt[OPT_GAMMA_VECTOR_GRAY].desc = SANE_DESC_GAMMA_VECTOR;
  dev->opt[OPT_GAMMA_VECTOR_GRAY].type = SANE_TYPE_INT;
  dev->opt[OPT_GAMMA_VECTOR_GRAY].cap |= SANE_CAP_INACTIVE;
  dev->opt[OPT_GAMMA_VECTOR_GRAY].unit = SANE_UNIT_NONE;
  dev->opt[OPT_GAMMA_VECTOR_GRAY].size = GAMMA_LENGTH * sizeof (SANE_Word);
  dev->opt[OPT_GAMMA_VECTOR_GRAY].constraint_type = SANE_CONSTRAINT_RANGE;
  dev->opt[OPT_GAMMA_VECTOR_GRAY].constraint.range = &gamma_range;
  dev->val[OPT_GAMMA_VECTOR_GRAY].wa = dev->gamma_GRAY;

  /* preview */
  dev->opt[OPT_PREVIEW].name = SANE_NAME_PREVIEW;
  dev->opt[OPT_PREVIEW].title = SANE_TITLE_PREVIEW;
  dev->opt[OPT_PREVIEW].desc = SANE_DESC_PREVIEW;
  dev->opt[OPT_PREVIEW].type = SANE_TYPE_BOOL;
  dev->opt[OPT_PREVIEW].cap = SANE_CAP_SOFT_DETECT | SANE_CAP_SOFT_SELECT;
  dev->val[OPT_PREVIEW].w = SANE_FALSE;

  /* Lastly, set the default scan mode. This might change some
   * values previously set here. */
  sane_control_option (dev, OPT_MODE, SANE_ACTION_SET_VALUE,
                   (SANE_String_Const *) scan_mode_list[0], NULL);
}

/* 
 * Wait until the scanner is ready.
 */
static SANE_Status
leo_wait_scanner (Leo_Scanner * dev)
{
  SANE_Status status;
  int timeout;
  CDB cdb;

  DBG (DBG_proc, "leo_wait_scanner: enter\n");

  MKSCSI_TEST_UNIT_READY (cdb);

  /* Set the timeout to 60 seconds. */
  timeout = 60;

  while (timeout > 0)
    {

      /* test unit ready */
      status = sanei_scsi_cmd2 (dev->sfd, cdb.data, cdb.len,
                        NULL, 0, NULL, NULL);

      if (status == SANE_STATUS_GOOD)
      {
        return SANE_STATUS_GOOD;
      }

      sleep (1);
    };

  DBG (DBG_proc, "leo_wait_scanner: scanner not ready\n");
  return (SANE_STATUS_IO_ERROR);
}

/* Read the image from the scanner and fill the temporary buffer with it. */
static SANE_Status
leo_fill_image (Leo_Scanner * dev)
{
  SANE_Status status;
  size_t size;
  CDB cdb;
  unsigned char *image;

  DBG (DBG_proc, "leo_fill_image: enter\n");

  assert (dev->image_begin == dev->image_end);
  assert (dev->real_bytes_left > 0);

  dev->image_begin = 0;
  dev->image_end = 0;

  while (dev->real_bytes_left)
    {
      /* 
       * Try to read the maximum number of bytes.
       */
      size = 0;
      while (size == 0)
      {
        status = get_filled_data_length (dev, &size);
        if (status)
          return (status);
        if (size == 0)
          usleep (100000);    /* sleep 1/10th of second */
      }

      if (size > dev->real_bytes_left)
      size = dev->real_bytes_left;
      if (size > dev->image_size - dev->image_end)
      size = dev->image_size - dev->image_end;

      /* The scanner seems to hang if more than 32KB are read. */
      if (size > 0x7fff)
      size = 0x7fff;

      /* Always read a multiple of a line. */
      size = size - (size % dev->params.bytes_per_line);

      if (size == 0)
      {
        /* Probably reached the end of the buffer. 
         * Check, just in case. */
        assert (dev->image_end != 0);
        return (SANE_STATUS_GOOD);
      }

      DBG (DBG_info, "leo_fill_image: to read   = %ld bytes (bpl=%d)\n",
         (long) size, dev->params.bytes_per_line);

      MKSCSI_READ_10 (cdb, 0, 0, size);

      hexdump (DBG_info2, "leo_fill_image: READ_10 CDB", cdb.data, 10);

      image = dev->image + dev->image_end;

      status = sanei_scsi_cmd2 (dev->sfd, cdb.data, cdb.len,
                        NULL, 0, image, &size);

      if (status != SANE_STATUS_GOOD)
      {
        DBG (DBG_error, "leo_fill_image: cannot read from the scanner\n");
        return status;
      }

      /* Some format conversion. */
      if (dev->scan_mode == LEO_COLOR)
      {

        /* Reorder the lines. The scanner gives color by color for
         * each line. */
        unsigned char *src = image;
        int nb_lines = size / dev->params.bytes_per_line;
        int i, j;

        for (i = 0; i < nb_lines; i++)
          {

            unsigned char *dest = dev->buffer;

            for (j = 0; j < dev->params.pixels_per_line; j++)
            {
              *dest = src[j + 0 * dev->params.pixels_per_line];
              dest++;
              *dest = src[j + 1 * dev->params.pixels_per_line];
              dest++;
              *dest = src[j + 2 * dev->params.pixels_per_line];
              dest++;
            }

            /* Copy the line back. */
            memcpy (src, dev->buffer, dev->params.bytes_per_line);

            src += dev->params.bytes_per_line;
          }
      }

      dev->image_end += size;
      dev->real_bytes_left -= size;

      DBG (DBG_info, "leo_fill_image: real bytes left = %ld\n",
         (long) dev->real_bytes_left);
    }

  return (SANE_STATUS_GOOD);  /* unreachable */
}

/* Copy from the raw buffer to the buffer given by the backend. 
 *
 * len in input is the maximum length available in buf, and, in
 * output, is the length written into buf.
 */
static void
leo_copy_raw_to_frontend (Leo_Scanner * dev, SANE_Byte * buf, size_t * len)
{
  size_t size;

  size = dev->image_end - dev->image_begin;
  if (size > *len)
    {
      size = *len;
    }
  *len = size;

  memcpy (buf, dev->image + dev->image_begin, size);

  dev->image_begin += size;
}

/* Stop a scan. */
static SANE_Status
do_cancel (Leo_Scanner * dev)
{
  DBG (DBG_sane_proc, "do_cancel enter\n");

  if (dev->scanning == SANE_TRUE)
    {

      /* Reset the scanner */
      dev->x_tl = 0;
      dev->x_tl = 0;
      dev->width = 0;
      dev->length = 0;
      leo_set_window (dev);

      leo_scan (dev);

      leo_close (dev);
    }

  dev->scanning = SANE_FALSE;

  DBG (DBG_sane_proc, "do_cancel exit\n");

  return SANE_STATUS_CANCELLED;
}

/* A default gamma table. */
static const SANE_Word gamma_init[GAMMA_LENGTH] = {
  0x00, 0x06, 0x0A, 0x0D, 0x10, 0x13, 0x15, 0x17, 0x19, 0x1B, 0x1D, 0x1F,
  0x21, 0x23, 0x25, 0x27,
  0x28, 0x2A, 0x2C, 0x2D, 0x2F, 0x30, 0x32, 0x33, 0x35, 0x36, 0x38, 0x39,
  0x3A, 0x3C, 0x3D, 0x3F,
  0x40, 0x41, 0x43, 0x44, 0x45, 0x46, 0x48, 0x49, 0x4A, 0x4B, 0x4D, 0x4E,
  0x4F, 0x50, 0x51, 0x53,
  0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5B, 0x5C, 0x5D, 0x5E, 0x5F, 0x60,
  0x61, 0x62, 0x63, 0x64,
  0x65, 0x67, 0x68, 0x69, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E, 0x6F, 0x70, 0x71,
  0x72, 0x73, 0x74, 0x75,
  0x76, 0x77, 0x78, 0x79, 0x7A, 0x7B, 0x7C, 0x7D, 0x7D, 0x7E, 0x7F, 0x80,
  0x81, 0x82, 0x83, 0x84,
  0x85, 0x86, 0x87, 0x88, 0x89, 0x8A, 0x8A, 0x8B, 0x8C, 0x8D, 0x8E, 0x8F,
  0x90, 0x91, 0x92, 0x92,
  0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x99, 0x9A, 0x9B, 0x9C, 0x9D,
  0x9E, 0x9F, 0x9F, 0xA0,
  0xA1, 0xA2, 0xA3, 0xA4, 0xA4, 0xA5, 0xA6, 0xA7, 0xA8, 0xA9, 0xA9, 0xAA,
  0xAB, 0xAC, 0xAD, 0xAD,
  0xAE, 0xAF, 0xB0, 0xB1, 0xB1, 0xB2, 0xB3, 0xB4, 0xB5, 0xB5, 0xB6, 0xB7,
  0xB8, 0xB9, 0xB9, 0xBA,
  0xBB, 0xBC, 0xBC, 0xBD, 0xBE, 0xBF, 0xC0, 0xC0, 0xC1, 0xC2, 0xC3, 0xC3,
  0xC4, 0xC5, 0xC6, 0xC6,
  0xC7, 0xC8, 0xC9, 0xC9, 0xCA, 0xCB, 0xCC, 0xCC, 0xCD, 0xCE, 0xCF, 0xCF,
  0xD0, 0xD1, 0xD2, 0xD2,
  0xD3, 0xD4, 0xD5, 0xD5, 0xD6, 0xD7, 0xD7, 0xD8, 0xD9, 0xDA, 0xDA, 0xDB,
  0xDC, 0xDC, 0xDD, 0xDE,
  0xDF, 0xDF, 0xE0, 0xE1, 0xE1, 0xE2, 0xE3, 0xE4, 0xE4, 0xE5, 0xE6, 0xE6,
  0xE7, 0xE8, 0xE8, 0xE9,
  0xEA, 0xEB, 0xEB, 0xEC, 0xED, 0xED, 0xEE, 0xEF, 0xEF, 0xF0, 0xF1, 0xF1,
  0xF2, 0xF3, 0xF4, 0xF4,
  0xF5, 0xF6, 0xF6, 0xF7, 0xF8, 0xF8, 0xF9, 0xFA, 0xFA, 0xFB, 0xFC, 0xFC,
  0xFD, 0xFE, 0xFE, 0xFF
};

/* Send the gamma */
static SANE_Status
leo_send_gamma (Leo_Scanner * dev)
{
  CDB cdb;
  SANE_Status status;
  struct
  {
    unsigned char gamma_R[GAMMA_LENGTH];
    unsigned char gamma_G[GAMMA_LENGTH];  /* also gray */
    unsigned char gamma_B[GAMMA_LENGTH];
  }
  param;
  size_t i;
  size_t size;

  DBG (DBG_proc, "leo_send_gamma: enter\n");

  size = sizeof (param);
  assert (size == 3 * GAMMA_LENGTH);
  MKSCSI_SEND_10 (cdb, 0x03, 0x01, size);

  if (dev->val[OPT_CUSTOM_GAMMA].w)
    {
      /* Use the custom gamma. */
      if (dev->scan_mode == LEO_GRAYSCALE)
      {
        /* Gray */
        for (i = 0; i < GAMMA_LENGTH; i++)
          {
            param.gamma_R[i] = dev->gamma_GRAY[i];
            param.gamma_G[i] = 0;
            param.gamma_B[i] = 0;
          }
      }
      else
      {
        /* Color */
        for (i = 0; i < GAMMA_LENGTH; i++)
          {
            param.gamma_R[i] = dev->gamma_R[i];
            param.gamma_G[i] = dev->gamma_G[i];
            param.gamma_B[i] = dev->gamma_B[i];
          }
      }
    }
  else
    {
      for (i = 0; i < GAMMA_LENGTH; i++)
      {
        param.gamma_R[i] = gamma_init[i];
        param.gamma_G[i] = gamma_init[i];
        param.gamma_B[i] = gamma_init[i];
      }
    }

  hexdump (DBG_info2, "leo_send_gamma:", cdb.data, cdb.len);

  status = sanei_scsi_cmd2 (dev->sfd, cdb.data, cdb.len,
                      &param, size, NULL, NULL);

  DBG (DBG_proc, "leo_send_gamma: exit, status=%d\n", status);

  return (status);
}

/* Send the halftone pattern */
static SANE_Status
leo_send_halftone_pattern (Leo_Scanner * dev)
{
  int i;
  const halftone_pattern_t *pattern;
  SANE_Status status;
  size_t size;
  CDB cdb;

  DBG (DBG_proc, "leo_send_halftone_pattern: enter\n");

  if (dev->scan_mode == LEO_HALFTONE)
    {

      i = get_string_list_index (halftone_pattern_list,
                         dev->val[OPT_HALFTONE_PATTERN].s);
      pattern = halftone_pattern_val[i];

      assert (pattern != NULL);

      size = sizeof (halftone_pattern_t);
      assert (size == 256);
      MKSCSI_SEND_10 (cdb, 0x02, 0x0F, size);

      hexdump (DBG_info2, "leo_send_gamma:", cdb.data, cdb.len);

      status = sanei_scsi_cmd2 (dev->sfd, cdb.data, cdb.len,
                        pattern, size, NULL, NULL);
    }
  else
    {
      status = SANE_STATUS_GOOD;
    }

  DBG (DBG_proc, "leo_send_halftone_pattern: exit, status=%d\n", status);

  return status;
}

/*--------------------------------------------------------------------------*/

/* Sane entry points */

SANE_Status
sane_init (SANE_Int * version_code, SANE_Auth_Callback authorize)
{
  FILE *fp;
  char dev_name[PATH_MAX];
  size_t len;

  DBG_INIT ();

  DBG (DBG_sane_init, "sane_init\n");

  authorize = authorize;      /* silence gcc */

  DBG (DBG_error, "This is sane-leo version %d.%d-%d\n", V_MAJOR,
       V_MINOR, BUILD);
  DBG (DBG_error, "(C) 2002 by Frank Zago\n");

  if (version_code)
    {
      *version_code = SANE_VERSION_CODE (V_MAJOR, V_MINOR, BUILD);
    }

  fp = sanei_config_open (LEO_CONFIG_FILE);
  if (!fp)
    {
      /* default to /dev/scanner instead of insisting on config file */
      attach_scanner ("/dev/scanner", 0);
      return SANE_STATUS_GOOD;
    }

  while (sanei_config_read (dev_name, sizeof (dev_name), fp))
    {
      if (dev_name[0] == '#') /* ignore line comments */
      continue;
      len = strlen (dev_name);

      if (!len)
      continue;         /* ignore empty lines */

      sanei_config_attach_matching_devices (dev_name, attach_one);
    }

  fclose (fp);

  DBG (DBG_proc, "sane_init: leave\n");

  return SANE_STATUS_GOOD;
}

SANE_Status
sane_get_devices (const SANE_Device *** device_list, SANE_Bool local_only)
{
  Leo_Scanner *dev;
  int i;

  DBG (DBG_proc, "sane_get_devices: enter\n");

  local_only = local_only;    /* silence gcc */

  if (devlist)
    free (devlist);

  devlist = malloc ((num_devices + 1) * sizeof (devlist[0]));
  if (!devlist)
    return SANE_STATUS_NO_MEM;

  i = 0;
  for (dev = first_dev; i < num_devices; dev = dev->next)
    devlist[i++] = &dev->sane;
  devlist[i++] = 0;

  *device_list = devlist;

  DBG (DBG_proc, "sane_get_devices: exit\n");

  return SANE_STATUS_GOOD;
}

SANE_Status
sane_open (SANE_String_Const devicename, SANE_Handle * handle)
{
  Leo_Scanner *dev;
  SANE_Status status;

  DBG (DBG_proc, "sane_open: enter\n");

  /* search for devicename */
  if (devicename[0])
    {
      DBG (DBG_info, "sane_open: devicename=%s\n", devicename);

      for (dev = first_dev; dev; dev = dev->next)
      {
        if (strcmp (dev->sane.name, devicename) == 0)
          {
            break;
          }
      }

      if (!dev)
      {
        status = attach_scanner (devicename, &dev);
        if (status != SANE_STATUS_GOOD)
          {
            return status;
          }
      }
    }
  else
    {
      DBG (DBG_sane_info, "sane_open: no devicename, opening first device\n");
      dev = first_dev;        /* empty devicename -> use first device */
    }

  if (!dev)
    {
      DBG (DBG_error, "No scanner found\n");

      return SANE_STATUS_INVAL;
    }

  leo_init_options (dev);

  /* Initialize the gamma table. */
  memcpy (dev->gamma_R, gamma_init, dev->opt[OPT_GAMMA_VECTOR_R].size);
  memcpy (dev->gamma_G, gamma_init, dev->opt[OPT_GAMMA_VECTOR_G].size);
  memcpy (dev->gamma_B, gamma_init, dev->opt[OPT_GAMMA_VECTOR_B].size);
  memcpy (dev->gamma_GRAY, gamma_init, dev->opt[OPT_GAMMA_VECTOR_GRAY].size);

  *handle = dev;

  DBG (DBG_proc, "sane_open: exit\n");

  return SANE_STATUS_GOOD;
}

const SANE_Option_Descriptor *
sane_get_option_descriptor (SANE_Handle handle, SANE_Int option)
{
  Leo_Scanner *dev = handle;

  DBG (DBG_proc, "sane_get_option_descriptor: enter, option %d\n", option);

  if ((unsigned) option >= OPT_NUM_OPTIONS)
    {
      return NULL;
    }

  DBG (DBG_proc, "sane_get_option_descriptor: exit\n");

  return dev->opt + option;
}

SANE_Status
sane_control_option (SANE_Handle handle, SANE_Int option,
                 SANE_Action action, void *val, SANE_Int * info)
{
  Leo_Scanner *dev = handle;
  SANE_Status status;
  SANE_Word cap;
  int i;

  DBG (DBG_proc, "sane_control_option: enter, option %d, action %d\n",
       option, action);

  if (info)
    {
      *info = 0;
    }

  if (dev->scanning)
    {
      return SANE_STATUS_DEVICE_BUSY;
    }

  if (option < 0 || option >= OPT_NUM_OPTIONS)
    {
      return SANE_STATUS_INVAL;
    }

  cap = dev->opt[option].cap;
  if (!SANE_OPTION_IS_ACTIVE (cap))
    {
      return SANE_STATUS_INVAL;
    }

  if (action == SANE_ACTION_GET_VALUE)
    {

      switch (option)
      {
        /* word options */
      case OPT_NUM_OPTS:
      case OPT_RESOLUTION:
      case OPT_TL_Y:
      case OPT_BR_Y:
      case OPT_TL_X:
      case OPT_BR_X:
      case OPT_CUSTOM_GAMMA:
      case OPT_PREVIEW:
        *(SANE_Word *) val = dev->val[option].w;
        return SANE_STATUS_GOOD;

        /* string options */
      case OPT_MODE:
      case OPT_HALFTONE_PATTERN:
        strcpy (val, dev->val[option].s);
        return SANE_STATUS_GOOD;

        /* Gamma */
      case OPT_GAMMA_VECTOR_R:
      case OPT_GAMMA_VECTOR_G:
      case OPT_GAMMA_VECTOR_B:
      case OPT_GAMMA_VECTOR_GRAY:
        memcpy (val, dev->val[option].wa, dev->opt[option].size);
        return SANE_STATUS_GOOD;

      default:
        return SANE_STATUS_INVAL;
      }
    }
  else if (action == SANE_ACTION_SET_VALUE)
    {

      if (!SANE_OPTION_IS_SETTABLE (cap))
      {
        DBG (DBG_error, "could not set option, not settable\n");
        return SANE_STATUS_INVAL;
      }

      status = sanei_constrain_value (dev->opt + option, val, info);
      if (status != SANE_STATUS_GOOD)
      {
        DBG (DBG_error, "could not set option, invalid value\n");
        return status;
      }

      switch (option)
      {

        /* Numeric side-effect options */
      case OPT_TL_Y:
      case OPT_BR_Y:
      case OPT_TL_X:
      case OPT_BR_X:
      case OPT_RESOLUTION:
        if (info)
          {
            *info |= SANE_INFO_RELOAD_PARAMS;
          }
        dev->val[option].w = *(SANE_Word *) val;
        return SANE_STATUS_GOOD;

        /* Numeric side-effect free options */
      case OPT_PREVIEW:
        dev->val[option].w = *(SANE_Word *) val;
        return SANE_STATUS_GOOD;

        /* String side-effect options */
      case OPT_MODE:
        if (strcmp (dev->val[option].s, val) == 0)
          return SANE_STATUS_GOOD;

        free (dev->val[OPT_MODE].s);
        dev->val[OPT_MODE].s = (SANE_Char *) strdup (val);

        dev->opt[OPT_CUSTOM_GAMMA].cap |= SANE_CAP_INACTIVE;
        dev->opt[OPT_GAMMA_VECTOR_R].cap |= SANE_CAP_INACTIVE;
        dev->opt[OPT_GAMMA_VECTOR_G].cap |= SANE_CAP_INACTIVE;
        dev->opt[OPT_GAMMA_VECTOR_B].cap |= SANE_CAP_INACTIVE;
        dev->opt[OPT_GAMMA_VECTOR_GRAY].cap |= SANE_CAP_INACTIVE;
        dev->opt[OPT_HALFTONE_PATTERN].cap |= SANE_CAP_INACTIVE;

        if (strcmp (dev->val[OPT_MODE].s, BLACK_WHITE_STR) == 0)
          {
            i = get_string_list_index (halftone_pattern_list,
                               dev->val[OPT_HALFTONE_PATTERN].s);
            if (halftone_pattern_val[i] == NULL)
            {
              dev->scan_mode = LEO_BW;
            }
            else
            {
              dev->scan_mode = LEO_HALFTONE;
            }
            dev->depth = 1;
            dev->opt[OPT_HALFTONE_PATTERN].cap &= ~SANE_CAP_INACTIVE;
          }
        else if (strcmp (dev->val[OPT_MODE].s, GRAY_STR) == 0)
          {
            dev->scan_mode = LEO_GRAYSCALE;
            dev->depth = 8;
            dev->opt[OPT_CUSTOM_GAMMA].cap &= ~SANE_CAP_INACTIVE;
            if (dev->val[OPT_CUSTOM_GAMMA].w)
            {
              dev->opt[OPT_GAMMA_VECTOR_GRAY].cap &= ~SANE_CAP_INACTIVE;
            }
          }
        else if (strcmp (dev->val[OPT_MODE].s, COLOR_STR) == 0)
          {
            dev->scan_mode = LEO_COLOR;
            dev->depth = 8;
            dev->opt[OPT_CUSTOM_GAMMA].cap &= ~SANE_CAP_INACTIVE;
            if (dev->val[OPT_CUSTOM_GAMMA].w)
            {
              dev->opt[OPT_GAMMA_VECTOR_R].cap &= ~SANE_CAP_INACTIVE;
              dev->opt[OPT_GAMMA_VECTOR_G].cap &= ~SANE_CAP_INACTIVE;
              dev->opt[OPT_GAMMA_VECTOR_B].cap &= ~SANE_CAP_INACTIVE;
            }
          }

        if (info)
          {
            *info |= SANE_INFO_RELOAD_OPTIONS | SANE_INFO_RELOAD_PARAMS;
          }
        return SANE_STATUS_GOOD;

      case OPT_HALFTONE_PATTERN:
        free (dev->val[option].s);
        dev->val[option].s = (SANE_String) strdup (val);
        i = get_string_list_index (halftone_pattern_list,
                             dev->val[OPT_HALFTONE_PATTERN].s);
        if (halftone_pattern_val[i] == NULL)
          {
            dev->scan_mode = LEO_BW;
          }
        else
          {
            dev->scan_mode = LEO_HALFTONE;
          }

        return SANE_STATUS_GOOD;

      case OPT_GAMMA_VECTOR_R:
      case OPT_GAMMA_VECTOR_G:
      case OPT_GAMMA_VECTOR_B:
      case OPT_GAMMA_VECTOR_GRAY:
        memcpy (dev->val[option].wa, val, dev->opt[option].size);
        return SANE_STATUS_GOOD;

      case OPT_CUSTOM_GAMMA:
        dev->val[OPT_CUSTOM_GAMMA].w = *(SANE_Word *) val;
        if (dev->val[OPT_CUSTOM_GAMMA].w)
          {
            /* use custom_gamma_table */
            if (dev->scan_mode == LEO_GRAYSCALE)
            {
              dev->opt[OPT_GAMMA_VECTOR_GRAY].cap &= ~SANE_CAP_INACTIVE;
            }
            else
            {
              /* color mode */
              dev->opt[OPT_GAMMA_VECTOR_R].cap &= ~SANE_CAP_INACTIVE;
              dev->opt[OPT_GAMMA_VECTOR_G].cap &= ~SANE_CAP_INACTIVE;
              dev->opt[OPT_GAMMA_VECTOR_B].cap &= ~SANE_CAP_INACTIVE;
            }
          }
        else
          {
            dev->opt[OPT_GAMMA_VECTOR_R].cap |= SANE_CAP_INACTIVE;
            dev->opt[OPT_GAMMA_VECTOR_G].cap |= SANE_CAP_INACTIVE;
            dev->opt[OPT_GAMMA_VECTOR_B].cap |= SANE_CAP_INACTIVE;
            dev->opt[OPT_GAMMA_VECTOR_GRAY].cap |= SANE_CAP_INACTIVE;
          }
        if (info)
          {
            *info |= SANE_INFO_RELOAD_OPTIONS;
          }
        return SANE_STATUS_GOOD;

      default:
        return SANE_STATUS_INVAL;
      }
    }

  DBG (DBG_proc, "sane_control_option: exit, bad\n");

  return SANE_STATUS_UNSUPPORTED;
}

SANE_Status
sane_get_parameters (SANE_Handle handle, SANE_Parameters * params)
{
  Leo_Scanner *dev = handle;

  DBG (DBG_proc, "sane_get_parameters: enter\n");

  if (!(dev->scanning))
    {

      /* Setup the parameters for the scan. These values will be re-used
       * in the SET WINDOWS command. */
      if (dev->val[OPT_PREVIEW].w == SANE_TRUE)
      {
        dev->x_resolution = 28;
        dev->y_resolution = 28;
        dev->x_tl = 0;
        dev->y_tl = 0;
        dev->x_br = mmToIlu (SANE_UNFIX (x_range.max));
        dev->y_br = mmToIlu (SANE_UNFIX (y_range.max));
      }
      else
      {
        dev->x_resolution = dev->val[OPT_RESOLUTION].w;
        dev->y_resolution = dev->val[OPT_RESOLUTION].w;
        dev->x_tl = mmToIlu (SANE_UNFIX (dev->val[OPT_TL_X].w));
        dev->y_tl = mmToIlu (SANE_UNFIX (dev->val[OPT_TL_Y].w));
        dev->x_br = mmToIlu (SANE_UNFIX (dev->val[OPT_BR_X].w));
        dev->y_br = mmToIlu (SANE_UNFIX (dev->val[OPT_BR_Y].w));
      }

      /* Check the corners are OK. */
      if (dev->x_tl > dev->x_br)
      {
        int s;
        s = dev->x_tl;
        dev->x_tl = dev->x_br;
        dev->x_br = s;
      }
      if (dev->y_tl > dev->y_br)
      {
        int s;
        s = dev->y_tl;
        dev->y_tl = dev->y_br;
        dev->y_br = s;
      }

      dev->width = dev->x_br - dev->x_tl;
      dev->length = dev->y_br - dev->y_tl;

      /* Prepare the parameters for the caller. */
      memset (&dev->params, 0, sizeof (SANE_Parameters));

      dev->params.last_frame = SANE_TRUE;

      switch (dev->scan_mode)
      {
      case LEO_BW:
      case LEO_HALFTONE:
        dev->params.format = SANE_FRAME_GRAY;
        dev->params.pixels_per_line = dev->width & ~0x7;
        dev->params.bytes_per_line = dev->params.pixels_per_line / 8;
        dev->params.depth = 1;
        break;
      case LEO_GRAYSCALE:
        dev->params.format = SANE_FRAME_GRAY;
        dev->params.pixels_per_line = dev->width;
        dev->params.bytes_per_line = dev->params.pixels_per_line;
        dev->params.depth = 8;
        break;
      case LEO_COLOR:
        dev->params.format = SANE_FRAME_RGB;
        dev->params.pixels_per_line = dev->width;
        dev->params.bytes_per_line = dev->params.pixels_per_line * 3;
        dev->params.depth = 8;
        break;
      }

      dev->params.lines = dev->length;
    }

  /* Return the current values. */
  if (params)
    {
      *params = (dev->params);
    }

  DBG (DBG_proc, "sane_get_parameters: exit\n");

  return SANE_STATUS_GOOD;
}

SANE_Status
sane_start (SANE_Handle handle)
{
  Leo_Scanner *dev = handle;
  SANE_Status status;

  DBG (DBG_proc, "sane_start: enter\n");

  if (!(dev->scanning))
    {

      sane_get_parameters (dev, NULL);

      /* Open again the scanner. */
      if (sanei_scsi_open
        (dev->devicename, &(dev->sfd), leo_sense_handler, dev) != 0)
      {
        DBG (DBG_error, "ERROR: sane_start: open failed\n");
        return SANE_STATUS_INVAL;
      }

      /* The scanner must be ready. */
      status = leo_wait_scanner (dev);
      if (status)
      {
        leo_close (dev);
        return status;
      }

      status = leo_set_window (dev);
      if (status)
      {
        leo_close (dev);
        return status;
      }

      status = leo_send_gamma (dev);
      if (status)
      {
        leo_close (dev);
        return status;
      }

      status = leo_send_halftone_pattern (dev);
      if (status)
      {
        leo_close (dev);
        return status;
      }

      status = leo_scan (dev);
      if (status)
      {
        leo_close (dev);
        return status;
      }

      status = leo_wait_scanner (dev);
      if (status)
      {
        leo_close (dev);
        return status;
      }

      status = leo_get_scan_size (dev);
      if (status)
      {
        leo_close (dev);
        return status;
      }

    }

  dev->image_end = 0;
  dev->image_begin = 0;

  dev->bytes_left = dev->params.bytes_per_line * dev->params.lines;
  dev->real_bytes_left = dev->params.bytes_per_line * dev->params.lines;

  dev->scanning = SANE_TRUE;

  DBG (DBG_proc, "sane_start: exit\n");

  return SANE_STATUS_GOOD;
}

SANE_Status
sane_read (SANE_Handle handle, SANE_Byte * buf, SANE_Int max_len,
         SANE_Int * len)
{
  SANE_Status status;
  Leo_Scanner *dev = handle;
  size_t size;
  int buf_offset;       /* offset into buf */

  DBG (DBG_proc, "sane_read: enter\n");

  *len = 0;

  if (!(dev->scanning))
    {
      /* OOPS, not scanning */
      return do_cancel (dev);
    }

  if (dev->bytes_left <= 0)
    {
      return (SANE_STATUS_EOF);
    }

  buf_offset = 0;

  do
    {
      if (dev->image_begin == dev->image_end)
      {
        /* Fill image */
        status = leo_fill_image (dev);
        if (status != SANE_STATUS_GOOD)
          {
            return (status);
          }
      }

      /* Something must have been read */
      if (dev->image_begin == dev->image_end)
      {
        DBG (DBG_info, "sane_read: nothing read\n");
        return SANE_STATUS_IO_ERROR;
      }

      /* Copy the data to the frontend buffer. */
      size = max_len - buf_offset;
      if (size > dev->bytes_left)
      {
        size = dev->bytes_left;
      }
      leo_copy_raw_to_frontend (dev, buf + buf_offset, &size);

      buf_offset += size;

      dev->bytes_left -= size;
      *len += size;

    }
  while ((buf_offset != max_len) && dev->bytes_left);

  DBG (DBG_info, "sane_read: leave, bytes_left=%ld\n",
       (long) dev->bytes_left);

  return SANE_STATUS_GOOD;
}

SANE_Status
sane_set_io_mode (SANE_Handle handle, SANE_Bool non_blocking)
{
  SANE_Status status;
  Leo_Scanner *dev = handle;

  DBG (DBG_proc, "sane_set_io_mode: enter\n");

  handle = handle;            /* silence gcc */
  non_blocking = non_blocking;      /* silence gcc */

  if (!dev->scanning)
    {
      return SANE_STATUS_INVAL;
    }

  if (non_blocking == SANE_FALSE)
    {
      status = SANE_STATUS_GOOD;
    }
  else
    {
      status = SANE_STATUS_UNSUPPORTED;
    }

  DBG (DBG_proc, "sane_set_io_mode: exit\n");

  return status;
}

SANE_Status
sane_get_select_fd (SANE_Handle handle, SANE_Int * fd)
{
  DBG (DBG_proc, "sane_get_select_fd: enter\n");

  handle = handle;            /* silence gcc */
  fd = fd;              /* silence gcc */

  DBG (DBG_proc, "sane_get_select_fd: exit\n");

  return SANE_STATUS_UNSUPPORTED;
}

void
sane_cancel (SANE_Handle handle)
{
  Leo_Scanner *dev = handle;

  DBG (DBG_proc, "sane_cancel: enter\n");

  do_cancel (dev);

  DBG (DBG_proc, "sane_cancel: exit\n");
}

void
sane_close (SANE_Handle handle)
{
  Leo_Scanner *dev = handle;
  Leo_Scanner *dev_tmp;

  DBG (DBG_proc, "sane_close: enter\n");

  do_cancel (dev);
  leo_close (dev);

  /* Unlink dev. */
  if (first_dev == dev)
    {
      first_dev = dev->next;
    }
  else
    {
      dev_tmp = first_dev;
      while (dev_tmp->next && dev_tmp->next != dev)
      {
        dev_tmp = dev_tmp->next;
      }
      if (dev_tmp->next != NULL)
      {
        dev_tmp->next = dev_tmp->next->next;
      }
    }

  leo_free (dev);
  num_devices--;

  DBG (DBG_proc, "sane_close: exit\n");
}

void
sane_exit (void)
{
  DBG (DBG_proc, "sane_exit: enter\n");

  while (first_dev)
    {
      sane_close (first_dev);
    }

  if (devlist)
    {
      free (devlist);
      devlist = NULL;
    }

  DBG (DBG_proc, "sane_exit: exit\n");
}

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