Initial import of sane-backends version 1.0.24-1.2

1 files changed, 2083 insertions, 0 deletions

diff --git a/backend/agfafocus.c b/backend/agfafocus.c
new file mode 100644
index 0000000..bc21558
--- /dev/null
+++ b/backend/agfafocus.c
@@ -0,0 +1,2083 @@
+/* sane - Scanner Access Now Easy.
+
+   This file (C) 1997 Ingo Schneider
+             (C) 1998 Karl Anders Øygard
+
+   This file is part of the SANE package.
+
+   SANE 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.
+
+   SANE 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 sane; see the file COPYING.  If not, write to the Free
+   Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+   This file implements a SANE backend for AGFA Focus flatbed scanners.  */
+
+#include "../include/sane/config.h"
+
+#include <signal.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <sys/types.h>
+
+#include "../include/sane/sane.h"
+#include "../include/sane/sanei.h"
+#include "../include/sane/sanei_config.h"
+#include "../include/sane/saneopts.h"
+#include "../include/sane/sanei_scsi.h"
+#include "../include/sane/sanei_thread.h"
+
+#define BACKEND_NAME	agfafocus
+#include "../include/sane/sanei_backend.h"
+
+#include "agfafocus.h"
+
+#ifndef PATH_MAX
+# define PATH_MAX	1024
+#endif
+
+
+#undef Byte
+#define Byte SANE_Byte
+
+static int num_devices;
+static AgfaFocus_Device *agfafocus_devices;
+
+static const SANE_String_Const focus_mode_list[] =
+{
+  "Lineart", "Gray (6 bit)",
+  0
+};
+
+static const SANE_String_Const focusii_mode_list[] =
+{
+  "Lineart", "Gray (6 bit)", "Gray (8 bit)",
+  0
+};
+
+static const SANE_String_Const focuscolor_mode_list[] =
+{
+  "Lineart", "Gray (6 bit)", "Gray (8 bit)", "Color (18 bit)", "Color (24 bit)",
+  0
+};
+
+static const SANE_String_Const halftone_list[] =
+{
+  "None", "Dispersed dot 4x4", "Round (Clustered dot 4x4)", "Diamond (Clustered dot 4x4)",
+  0
+};
+
+static const SANE_String_Const halftone_upload_list[] =
+{
+  "None", "Dispersed dot 4x4", "Round (Clustered dot 4x4)", "Diamond (Clustered dot 4x4)",
+  0
+};
+
+static const SANE_String_Const source_list[] =
+{
+  "Opaque/Normal", "Transparency",
+  0
+};
+
+static const SANE_String_Const quality_list[] =
+{
+  "Low", "Normal", "High",
+  0
+};
+
+static size_t
+max_string_size (const SANE_String_Const strings[])
+{
+  size_t size, max_size = 0;
+  int i;
+  DBG (11, ">> max_string_size\n");
+
+  for (i = 0; strings[i]; ++i)
+    {
+      size = strlen (strings[i]) + 1;
+      if (size > max_size)
+        max_size = size;
+    }
+
+  DBG (11, "<< max_string_size\n");
+  return max_size;
+}
+
+/* sets loc_s bytes long value at offset loc in scsi command to value size  */
+static void 
+set_size (Byte * loc, int loc_s, size_t size)
+{
+  int i;
+  
+  for (i = 0; i < loc_s; i++)
+    {
+      loc[loc_s - i - 1] = (size >> (i * 8)) & 0xff;
+    }
+}
+
+/* gets loc_s bytes long value from loc in scsi command */
+static int
+get_size (Byte * loc, int loc_s)
+{
+  int i;
+  int j = 0;
+
+  for (i = 0; i < loc_s; i++)
+    {
+      j = (j << 8) + (loc[i] & 0xff);
+    }
+
+  return j;
+}
+
+static long 
+reserve_unit (int fd)
+{
+  struct 
+  {
+    /* Command */
+    Byte cmd;
+    Byte lun;
+    Byte res[2];
+    Byte tr_len;
+    Byte ctrl;
+  }
+  scsi_reserve;
+
+  memset (&scsi_reserve, 0, sizeof (scsi_reserve));
+
+  scsi_reserve.cmd = 0x16; /* RELEASE */
+
+  DBG (3, "reserve_unit()\n");
+  return sanei_scsi_cmd (fd, &scsi_reserve, sizeof (scsi_reserve), 0, 0);
+}
+
+static long 
+release_unit (int fd)
+{
+  struct 
+  {
+    /* Command */
+    Byte cmd;
+    Byte lun;
+    Byte res[2];
+    Byte tr_len;
+    Byte ctrl;
+  }
+  scsi_release;
+
+  memset (&scsi_release, 0, sizeof (scsi_release));
+
+  scsi_release.cmd = 0x17; /* RELEASE */
+
+  DBG (3, "release_unit()\n");
+  return sanei_scsi_cmd (fd, &scsi_release, sizeof (scsi_release), 0, 0);
+}
+
+static SANE_Status
+test_ready (int fd)
+{
+  SANE_Status status;
+  int try;
+
+  struct 
+  {
+    /* Command */
+    Byte cmd;
+    Byte lun;
+    Byte res[2];
+    Byte tr_len;
+    Byte ctrl;
+  }
+  scsi_test_ready;
+
+  memset (&scsi_test_ready, 0, sizeof (scsi_test_ready));
+
+  scsi_test_ready.cmd = 0x00; /* TEST UNIT READY */
+
+  for (try = 0; try < 1000; ++try)
+    {
+      DBG (3, "test_ready: sending TEST_UNIT_READY\n");
+      status = sanei_scsi_cmd (fd, &scsi_test_ready, sizeof (scsi_test_ready),
+			       0, 0);
+
+      switch (status)
+	{
+	case SANE_STATUS_DEVICE_BUSY:
+	  usleep (100000);	/* retry after 100ms */
+	  break;
+
+	case SANE_STATUS_GOOD:
+	  return status;
+
+	default:
+	  DBG (1, "test_ready: test unit ready failed (%s)\n",
+	       sane_strstatus (status));
+	  return status;
+	}
+    }
+
+  DBG (1, "test_ready: timed out after %d attempts\n", try);
+  return SANE_STATUS_IO_ERROR;
+}
+
+static SANE_Status
+sense_handler (int scsi_fd, u_char *result, void *arg)
+{
+  scsi_fd = scsi_fd;			/* silence gcc */
+  arg = arg;					/* silence gcc */
+
+  if (result[0])
+    {
+      DBG (0, "sense_handler() : sense code = %02x\n", result[0]);
+      return SANE_STATUS_IO_ERROR;
+    }
+  else
+    {
+      return SANE_STATUS_GOOD;
+    }
+}
+
+static SANE_Status
+stop_scan (int fd)
+{
+  fd = fd;						/* silence gcc */
+
+  /* XXX don't know how to stop the scanner. To be tested ! */
+#if 0
+  const Byte scsi_rewind[] =
+  {
+    0x01, 0x00, 0x00, 0x00, 0x00, 0x00
+  };
+  DBG (1, "Trying to stop scanner...\n");
+  return sanei_scsi_cmd (fd, scsi_rewind, sizeof (scsi_rewind), 0, 0);
+#else
+  return SANE_STATUS_GOOD;
+#endif
+}
+
+
+static SANE_Status
+start_scan (int fd, SANE_Bool cont)
+{
+  struct
+  {
+    /* Command */
+    Byte cmd;
+    Byte lun;
+    Byte res[2];
+    Byte tr_len;
+    Byte ctrl;
+
+    /* Data */
+    Byte wid;
+  }
+  scsi_start_scan;
+
+  memset (&scsi_start_scan, 0, sizeof (scsi_start_scan));
+
+  scsi_start_scan.cmd = 0x1b; /* SCAN */
+  scsi_start_scan.tr_len = 1;
+  scsi_start_scan.wid = 0;
+  scsi_start_scan.ctrl = (cont == SANE_TRUE) ? 0x80 : 0x00;
+
+  DBG (1, "Starting scanner ...\n");
+  return sanei_scsi_cmd (fd, &scsi_start_scan, sizeof (scsi_start_scan), 0, 0);
+}
+
+static void
+wait_ready (int fd)
+{
+  struct
+  {
+    Byte bytes[2];		/* Total # of bytes */
+    Byte scan[2];		/* ms to complete - driver sleep time */
+  } result;
+
+  size_t size = sizeof (result);
+  SANE_Status status;
+
+  struct {
+    Byte cmd;
+    Byte lun;
+    Byte data_type;
+    Byte re1[3];
+    Byte tr_len[3];
+    Byte ctrl;
+  } cmd;
+  
+  memset (&cmd, 0, sizeof (cmd));
+
+  cmd.cmd = 0x28;       /* READ */
+  cmd.data_type = 0x80; /* get scan time */
+
+  set_size (cmd.tr_len, 3, sizeof (result));
+
+  while (1)
+    {
+      status = sanei_scsi_cmd (fd, &cmd, sizeof (cmd),
+			       &result, &size);
+
+      if (status != SANE_STATUS_GOOD || size != sizeof (result))
+	{
+	  /*
+	     Command failed, the assembler code of the windows scan library
+	     ignores this condition, and so do I
+	   */
+	  break;
+	}
+      else
+	{
+	  /* left is the amount of seconds left till the scanner is
+             ready * 100 */
+	  int left = get_size (result.scan, 2);
+
+	  DBG (1, "wait_ready() : %d left...\n", left);
+
+	  if (!left)
+	    break;
+	  /* We delay only for half the given time */
+	  else if (left < 200)
+	    usleep (left * 5000);
+	  else
+	    sleep (left / 200);
+	}
+    }
+
+  return;
+}
+
+static SANE_Status
+get_read_sizes (int fd, int *lines_available, int *bpl, int *total_lines)
+{
+  struct {
+    Byte reserved1[8];
+    Byte line_width[2];
+    Byte total_lines[2];
+    Byte cur_line[2];
+    Byte lines_this_block[2];
+    Byte reserved[8];
+  } read_sizes;
+
+  const Byte scsi_read[] =
+  {
+    0x28, 0x00,				/* opcode, lun */
+    0x81,				/* data type 81 == read time left */
+    0x00, 0x00, 0x00,			/* reserved */
+    0x00, 0x00, sizeof (read_sizes),	/* transfer length */
+    0x00,				/* control byte */
+  };
+
+  size_t size = sizeof (read_sizes);
+  SANE_Status status;
+
+  status = sanei_scsi_cmd (fd, scsi_read, sizeof (scsi_read), &read_sizes, &size);
+
+  if (status != SANE_STATUS_GOOD || size != sizeof (read_sizes))
+    {
+      /* Command failed */
+      return SANE_STATUS_IO_ERROR;
+    }
+  else
+    {
+      *lines_available = get_size (read_sizes.lines_this_block, 2);
+      *bpl = get_size (read_sizes.cur_line, 2);
+      if (total_lines)
+	*total_lines = get_size (read_sizes.total_lines, 2);
+    }
+
+  DBG (1, "get_read_sizes() : %d of %d, %d\n",
+       *lines_available, total_lines ? *total_lines : -1, *bpl);
+
+  return SANE_STATUS_GOOD;
+}
+
+static SANE_Status
+set_window (AgfaFocus_Scanner * s)
+/* This function sets and sends the window for scanning */
+{
+  double pixels_per_mm = (double) s->val[OPT_RESOLUTION].w / MM_PER_INCH;
+
+  SANE_Bool auto_bright = s->val[OPT_AUTO_BRIGHTNESS].b;
+  SANE_Bool auto_contr = s->val[OPT_AUTO_CONTRAST].b;
+
+  /* ranges down 255 (dark) down to 1(bright) */
+  int brightness = auto_bright ? 0 : (SANE_UNFIX (s->val[OPT_BRIGHTNESS].w)
+				      * -1.27 + 128.5);
+  /* ranges from 1 (little contrast) up to 255 (much contrast) */
+  int contrast = auto_contr ? 0 : (SANE_UNFIX (s->val[OPT_CONTRAST].w)
+				   * 1.27 + 128.5);
+
+  int width;
+
+  /* ranges from 40 (dark) down to 0 (bright) */
+  int bright_adjust = (SANE_UNFIX (s->val[OPT_BRIGHTNESS].w) * -20.0) / 100.0 + 20.0;
+
+  /* ranges from 20 (little contrast) down to -20 = 235 (much contrast) */
+  int contr_adjust = (SANE_UNFIX (s->val[OPT_CONTRAST].w) * -20.0) / 100.0;
+
+  /* Warning ! The following structur SEEMS to be a valid SCSI-2 SET_WINDOW
+     command.  But e.g. the limits for the window are only 2 Bytes instead
+     of 4.  The scanner was built at about 1990, so SCSI-2 wasn't available
+     for development...  */
+
+  struct
+    {
+      Byte cmd;
+      Byte lun;
+      Byte re1[4];
+      Byte tr_len[3];
+      Byte ctrl;
+
+      Byte re2[6];
+      Byte wd_len[2];
+
+      struct
+	{
+	  Byte wid;                      /* Window ID */
+	  Byte autobit;                  /* Window creation */
+
+	  Byte x_axis_res[2];            /* X resolution */
+	  Byte y_axis_res[2];            /* X resolution */
+
+	  Byte x_axis_ul[2];             /* X upper left */
+	  Byte y_axis_ul[2];             /* Y upper left */
+
+	  Byte wwidth[2];                /* Width */
+	  Byte wlength[2];               /* Length */
+
+	  Byte contrast;                 /* Contrast */
+	  Byte dummy1;
+	  Byte intensity;                /* Intensity */
+
+	  Byte image_comp;               /* Image composition (0, 2, 5) */
+	  Byte bpp;                      /* Bits per pixel */
+
+          Byte tonecurve;                /* Tone curve (0 - 8) */
+	  Byte ht_pattern;               /* Halftone pattern */
+	  Byte paddingtype;              /* Padding type */
+			           
+          Byte bitordering[2];           /* Bit ordering (0 = left to right) */
+          Byte comprtype;                /* Compression type */
+          Byte comprarg;                 /* Compression argument */
+
+	  Byte dummy2[6];
+	  Byte edge;                     /* Sharpening (0 - 7) */
+	  Byte dummy3;
+
+	  Byte bright_adjust;            /*  */
+	  Byte contr_adjust;             /*  */
+
+	  Byte imagewidthtruncation;     /* */
+
+	  Byte dummy4;
+          Byte quality_type;             /* 0 normal, 1 high, 255 low */
+          Byte red_att;
+          Byte green_att;
+          Byte blue_att;
+
+	  Byte dummy5[5];
+	  Byte color_planes;
+	  Byte orig_type;
+	  Byte fixturetype;
+	  Byte exposure[2];
+	  Byte defocus[2];
+	  Byte dummy6[4];
+          Byte descreen_factor;
+
+	  Byte packing_word_length;
+	  Byte packing_number_of_pixels;
+	  Byte packing_color_mode;
+	  Byte strokenab;
+	  Byte rotatenab;
+	  Byte autostrokenab;
+	  Byte dummy7;
+	}
+      wd;
+
+    }
+  cmd;
+
+  memset (&cmd, 0, sizeof (cmd));
+
+  cmd.cmd = 0x24; /* SET WINDOW PARAMETERS */
+
+  switch (s->hw->type)
+    {
+    case AGFAGRAY64:
+    case AGFALINEART:
+    case AGFAGRAY256:
+      set_size (cmd.tr_len, 3, 36 + 8);
+      set_size (cmd.wd_len, 2, 36);
+      break;
+      
+    case AGFACOLOR:
+      set_size (cmd.tr_len, 3, 65 + 8);
+      set_size (cmd.wd_len, 2, 65);
+      break;
+    }
+
+  /* Resolution.  Original comment in German: Aufloesung */
+  set_size (cmd.wd.x_axis_res, 2, s->val[OPT_RESOLUTION].w);
+  set_size (cmd.wd.y_axis_res, 2, s->val[OPT_RESOLUTION].w);
+
+  /* Scan window position/size.  Original comment in German:
+     Fensterposition / Groesse */
+  set_size (cmd.wd.x_axis_ul, 2,
+	    SANE_UNFIX (s->val[OPT_TL_X].w) * pixels_per_mm + 0.5);
+  set_size (cmd.wd.y_axis_ul, 2,
+	    SANE_UNFIX (s->val[OPT_TL_Y].w) * pixels_per_mm + 0.5);
+
+  width = (SANE_UNFIX (s->val[OPT_BR_X].w - s->val[OPT_TL_X].w) * pixels_per_mm) + 0.5;
+
+  if (s->bpp == 1 && width % 8)
+    width += 8 - width % 8;
+
+  set_size (cmd.wd.wwidth, 2, width);
+  set_size (cmd.wd.wlength, 2, SANE_UNFIX (s->val[OPT_BR_Y].w - s->val[OPT_TL_Y].w)
+	    * pixels_per_mm + 0.5);
+
+  cmd.wd.bpp = s->bpp;
+
+  if (s->mode == COLOR18BIT ||
+      s->mode == COLOR24BIT)
+    {
+      cmd.wd.paddingtype = 3;
+      cmd.wd.ht_pattern = 3;
+
+      cmd.wd.red_att = s->r_att;
+      cmd.wd.blue_att = s->g_att;
+      cmd.wd.green_att = s->b_att;
+      cmd.wd.color_planes = 0x0e;
+
+      set_size (cmd.wd.exposure, 2, s->exposure);
+
+      cmd.wd.packing_word_length = 1;
+      cmd.wd.packing_number_of_pixels = 1;
+      cmd.wd.packing_color_mode = 2;
+
+      if (s->bpp == 6)
+	cmd.wd.edge = s->edge;
+
+      DBG (3,
+	   "Setting parameters: imc %d, bpp %d, res %d, exp %d, attenuation [%d, %d, %d], edge %d\n",
+	   s->image_composition, s->bpp, s->val[OPT_RESOLUTION].w,
+	   s->exposure, cmd.wd.red_att, cmd.wd.blue_att, cmd.wd.green_att, s->edge);
+    }
+  else
+    {
+      if (s->bpp == 1)
+	cmd.wd.ht_pattern = s->halftone;
+      else
+	cmd.wd.ht_pattern = 3;
+      
+      cmd.wd.intensity = brightness;
+      cmd.wd.contrast = contrast;
+
+      cmd.wd.contr_adjust = contr_adjust;
+      cmd.wd.bright_adjust = bright_adjust;
+
+      cmd.wd.tonecurve = s->tonecurve;
+      cmd.wd.paddingtype = 3;
+      cmd.wd.edge = s->edge;
+
+      if (s->lin_log)
+	cmd.wd.dummy3 = 0x02;
+
+      DBG (3,
+	   "Setting parameters: imc %d, bpp %d, res %d, bri %d, con %d, bad %d, cad %d, ht %d, edge %d\n",
+	   s->image_composition, s->bpp, s->val[OPT_RESOLUTION].w,
+	   brightness, contrast, bright_adjust, contr_adjust, s->halftone, s->edge);
+    }
+
+  cmd.wd.image_comp = s->image_composition;
+  cmd.wd.quality_type = s->quality;
+  cmd.wd.orig_type = s->original;
+
+  return sanei_scsi_cmd (s->fd, &cmd, sizeof (cmd), 0, 0);
+}
+
+/* Tell scanner to scan more data. */
+
+static SANE_Status
+request_more_data (AgfaFocus_Scanner * s)
+{
+  SANE_Status status;
+  int lines_available;
+  int bytes_per_line;
+
+  status = start_scan (s->fd, SANE_TRUE);
+  if (status != SANE_STATUS_GOOD)
+    return status;
+
+  if (!s->hw->disconnect)
+    wait_ready (s->fd);
+
+  status = get_read_sizes (s->fd, &lines_available, &bytes_per_line, 0);
+
+  if (!lines_available)
+    return SANE_STATUS_INVAL;
+
+  s->lines_available = lines_available;
+
+  return SANE_STATUS_GOOD;
+}
+
+static SANE_Status
+upload_dither_matrix (AgfaFocus_Scanner * s, int rows, int cols, int *dither_matrix)
+{
+  struct {
+    Byte cmd;
+    Byte lun;
+    Byte data_type;
+    Byte re1[3];
+    Byte tr_len[3];
+    Byte ctrl;
+    
+    struct {
+      Byte nrrows[2];
+      Byte nrcols[2];
+      
+      struct {
+	Byte data[2];
+      } element[256];
+    } wd;
+  } cmd;
+  
+  SANE_Status status;
+  int i;
+  
+  memset (&cmd, 0, sizeof (cmd));
+
+  cmd.cmd = 0x2a;       /* WRITE */
+  cmd.data_type = 0x81; /* upload dither matrix */
+
+  set_size (cmd.tr_len, 3, 4 + (2 * rows * cols));
+  set_size (cmd.wd.nrrows, 2, rows);
+  set_size (cmd.wd.nrcols, 2, cols);
+
+  for (i = 0; i < cols * rows; ++i)
+    set_size (cmd.wd.element[i].data, 2, dither_matrix[i]);
+      
+  status = sanei_scsi_cmd (s->fd, &cmd, sizeof (cmd), 0, 0);
+  
+  if (status != SANE_STATUS_GOOD)
+    /* Command failed */
+    return SANE_STATUS_IO_ERROR;
+
+  DBG (1, "upload_dither_matrix(): uploaded dither matrix: %d, %d\n", rows, cols);
+
+  return SANE_STATUS_GOOD;
+}
+
+#if 0
+static SANE_Status
+upload_tonecurve (AgfaFocus_Scanner * s, int color_type, int input, int output, int dither_matrix[256])
+{
+  struct {
+   Byte cmd;
+   Byte lun;
+   Byte re1[4];
+   Byte tr_len[3];
+   Byte ctrl;
+   
+   Byte re2[6];
+   Byte wd_len[2];
+
+    struct {
+      Byte color_type[2];
+      Byte nrinput[2];
+      Byte nroutput[2];
+      
+      struct {
+	Byte data[2];
+      } outputval[256];
+    } wd;
+  } cmd;
+
+  SANE_Status status;
+  int i, j;
+
+  memset (&cmd, 0, sizeof (cmd));
+
+  cmd.cmd = 0x80;
+
+  set_size (cmd.tr_len, 3, sizeof (cmd.wd));
+  set_size (cmd.wd.nrrows, 2, rows);
+  set_size (cmd.wd.nrrows, 2, cols);
+
+  for (i = 0; i < cols; ++i)
+    for (j = 0; j < rows; ++j)
+      set_size (cmd.wd.element[j + i * rows].data, 2, dither_matrix[j + i * rows]);
+      
+  status = sanei_scsi_cmd (s->fd, &cmd, sizeof (cmd), 0, 0);
+  
+  if (status != SANE_STATUS_GOOD)
+  /*    * Command failed * */
+    return SANE_STATUS_IO_ERROR;
+
+  DBG (1, "upload_dither_matrix(): uploaded dither matrix\n");
+
+  return SANE_STATUS_GOOD;
+}
+#endif
+
+/* May only be called when there is at least one row of data to
+   be read.
+
+   Original comment in German: Darf nur aufgerufen werden, wenn
+   wirklich noch Zeilen zu scannen/lesen sind !  */
+static SANE_Status
+read_data (AgfaFocus_Scanner * s, SANE_Byte *buf, int lines, int bpl)
+{
+  struct {
+   Byte cmd;
+   Byte lun;
+   Byte re1[4];
+   Byte tr_len[3];
+   Byte ctrl;
+  } cmd;
+
+  SANE_Status status;
+  size_t size;
+  unsigned int i;
+
+  memset (&cmd, 0, sizeof (cmd));
+
+  cmd.cmd = 0x28; /* READ */
+
+  set_size (cmd.tr_len, 3, lines);
+  size = lines * bpl;
+  
+  status = sanei_scsi_cmd (s->fd, &cmd, sizeof (cmd), buf, &size);
+  
+  if (status != SANE_STATUS_GOOD)
+    {
+      DBG (1, "sanei_scsi_cmd() = %d\n", status);
+      return SANE_STATUS_IO_ERROR;
+    }
+  
+  if (size != ((unsigned int) lines * bpl))
+    {
+      DBG (1, "sanei_scsi_cmd(): got %lu bytes, expected %d\n",
+	   (u_long) size, lines * bpl);
+      return SANE_STATUS_INVAL;
+    }
+  
+  DBG (1, "Got %lu bytes\n", (u_long) size);
+
+  /* Reverse: */
+  if (s->bpp != 1)
+    {
+      if (s->bpp != 6)
+	for (i = 0; i < size; i++)
+	  buf[i] = 255 - buf[i];
+      else
+	for (i = 0; i < size; i++)
+	  buf[i] = 255 - ((buf[i] * 256.0f) / 64.0f);
+    }
+		  
+  s->lines_available -= lines;
+
+  return SANE_STATUS_GOOD;
+}
+
+
+static SANE_Status
+attach (const char *devname, AgfaFocus_Device ** devp)
+{
+#define ATTACH_SCSI_INQ_LEN 55
+  const Byte scsi_inquiry[] =
+  {
+    0x12, 0x00, 0x00, 0x00, ATTACH_SCSI_INQ_LEN, 0x00
+  };
+  Byte result[ATTACH_SCSI_INQ_LEN];
+
+  int fd;
+  AgfaFocus_Device *dev;
+  SANE_Status status;
+  size_t size;
+  int i;
+
+  for (dev = agfafocus_devices; dev; dev = dev->next)
+    if (strcmp (dev->sane.name, devname) == 0)
+      {
+	if (devp)
+	  *devp = dev;
+	return SANE_STATUS_GOOD;
+      }
+
+  DBG (3, "attach: opening %s\n", devname);
+  status = sanei_scsi_open (devname, &fd, sense_handler, 0);
+  if (status != SANE_STATUS_GOOD)
+    {
+      DBG (1, "attach: open failed (%s)\n", sane_strstatus (status));
+      return SANE_STATUS_INVAL;
+    }
+
+  DBG (4, "attach: sending INQUIRY\n");
+  size = sizeof (result);
+  status = sanei_scsi_cmd (fd, scsi_inquiry, sizeof (scsi_inquiry),
+			   result, &size);
+  if (status != SANE_STATUS_GOOD || size != ATTACH_SCSI_INQ_LEN)
+    {
+      DBG (1, "attach: inquiry failed (%s)\n", sane_strstatus (status));
+      sanei_scsi_close (fd);
+      return status;
+    }
+
+  status = test_ready (fd);
+  sanei_scsi_close (fd);
+  if (status != SANE_STATUS_GOOD)
+    return status;
+
+  /* The structure send by the scanner after inquiry is not SCSI-2
+     compatible.  The standard manufacturer/model fields are no ASCII
+     strings, but ?  At offset 36 my SIEMENS scanner identifies as an
+     AGFA one ?!   */
+
+  if (result[0] != 6 || strncmp ((char *)result + 36, "AGFA0", 5))
+    {
+      DBG (1, "attach: device doesn't look like a Siemens 9036 scanner\n");
+      return SANE_STATUS_INVAL;
+    }
+
+  DBG (4, "Inquiry data:\n");
+  DBG (4, "-----------\n");
+  for (i = 5; i < 55; i += 10)
+    DBG (4, "%02x %02x %02x %02x %02x %02x %02x %02x %02x %02x\n",
+      result[i], result[i + 1], result[i + 2], result[i + 3], result[i + 4],
+	 result[i + 5], result[i + 6], result[i + 7], result[i + 8],
+	 result[i + 9]);
+
+  dev = malloc (sizeof (*dev));
+
+  if (!dev)
+    return SANE_STATUS_NO_MEM;
+
+  memset (dev, 0, sizeof (*dev));
+
+  dev->sane.name = strdup (devname);
+  if (!strncmp ((char *)result + 36, "AGFA01", 6)) {
+    dev->sane.vendor = "AGFA";
+    dev->sane.model = "Focus GS Scanner (6 bit)";
+    dev->upload_user_defines = SANE_TRUE;
+    dev->type = AGFAGRAY64;
+  } else if (!strncmp ((char *)result + 36, "AGFA02", 6)) {
+    dev->sane.vendor = "AGFA";
+    dev->sane.model = "Focus Lineart Scanner";
+    dev->upload_user_defines = SANE_FALSE;
+    dev->type = AGFALINEART;
+  } else if (!strncmp ((char *)result + 36, "AGFA03", 6)) {
+    dev->sane.vendor = "AGFA";
+    dev->sane.model = "Focus II";
+    dev->upload_user_defines = SANE_TRUE;
+    dev->type = AGFAGRAY256;
+  } else if (!strncmp ((char *)result + 36, "AGFA04", 6)) {
+    dev->sane.vendor = "AGFA";
+    dev->sane.model = "Focus Color";
+    dev->upload_user_defines = SANE_TRUE;
+    dev->type = AGFACOLOR;
+  } else {
+    free (dev);
+    DBG (1, "attach: device looks like an AGFA scanner, but wasn't recognised\n");
+    return SANE_STATUS_INVAL;
+  }
+  dev->sane.type = "flatbed scanner";
+
+  dev->transparent = result[45] & 0x80 ? SANE_TRUE : SANE_FALSE;
+  dev->analoglog =   result[46] & 0x80 ? SANE_TRUE : SANE_FALSE;
+  dev->tos5 =        result[46] & 0x05 ? SANE_TRUE : SANE_FALSE;
+  dev->quality =     result[47] & 0x40 ? SANE_TRUE : SANE_FALSE;
+  dev->disconnect =  result[47] & 0x80 ? SANE_TRUE : SANE_FALSE;
+
+  DBG (4, "\n");
+  DBG (4, "scan modes:\n");
+  DBG (4, "-----------\n");
+  DBG (4, "three pass color mode: %s\n", dev->type >= AGFACOLOR ? "yes" : "no");
+  DBG (4, "8 bit gray mode: %s\n", dev->type >= AGFAGRAY64 ? "yes" : "no");
+  DBG (4, "uploadable matrices: %s\n", dev->upload_user_defines ? "yes" : "no");
+  DBG (4, "transparency: %s\n", dev->transparent ? "yes" : "no");
+  DBG (4, "disconnect: %s\n", dev->disconnect ? "yes" : "no");
+  DBG (4, "quality calibration: %s\n", dev->quality ? "yes" : "no");
+
+  dev->handle = 0;
+
+  DBG (3, "attach: found AgfaFocus scanner model\n");
+
+  ++num_devices;
+  dev->next = agfafocus_devices;
+  agfafocus_devices = dev;
+
+  if (devp)
+    *devp = dev;
+
+  return SANE_STATUS_GOOD;
+}
+
+static SANE_Status
+do_eof (AgfaFocus_Scanner *s)
+{
+  if (s->pipe >= 0)
+    {
+      close (s->pipe);
+      s->pipe = -1;
+    }
+  return SANE_STATUS_EOF;
+}
+
+
+static SANE_Status
+do_cancel (AgfaFocus_Scanner * s)
+{
+  s->scanning = SANE_FALSE;
+  s->pass = 0;
+
+  do_eof (s);
+
+  if (s->reader_pid != -1)
+    {
+      int exit_status;
+
+      /* ensure child knows it's time to stop: */
+      sanei_thread_kill (s->reader_pid);
+      sanei_thread_waitpid (s->reader_pid, &exit_status);
+      s->reader_pid = -1;
+    }
+
+  if (s->fd >= 0)
+    {
+      stop_scan (s->fd);
+      release_unit (s->fd);
+      sanei_scsi_close (s->fd);
+      s->fd = -1;
+    }
+
+  return SANE_STATUS_CANCELLED;
+}
+
+
+static SANE_Status
+init_options (AgfaFocus_Scanner * s)
+{
+  int i;
+
+  /* Hardware Limitations: must be static ! */
+  static const SANE_Int dpi_list[] =
+  {8, 100, 200, 300, 400, 500, 600, 700, 800};
+
+  static const SANE_Range percentage_range =
+  {
+    -100 << SANE_FIXED_SCALE_SHIFT,	/* minimum */
+    100 << SANE_FIXED_SCALE_SHIFT,	/* maximum */
+    1 << SANE_FIXED_SCALE_SHIFT	/* quantization */
+  };
+
+  static const SANE_Range sharpen_range =
+  {0, 7, 1};
+  static const SANE_Range exposure_range =
+  {0, 100, 0};
+  static const SANE_Range attenuation_range =
+  {
+    0 << SANE_FIXED_SCALE_SHIFT,	/* minimum */
+    100 << SANE_FIXED_SCALE_SHIFT,	/* maximum */
+    1 << SANE_FIXED_SCALE_SHIFT	        /* quantization */
+  };
+
+
+  static const SANE_Range x_range =
+  {0, SANE_FIX (8.27 * MM_PER_INCH), 0};
+  static const SANE_Range y_range =
+  {0, SANE_FIX (12.72 * MM_PER_INCH), 0};
+
+  /* ------ */
+
+  memset (s->opt, 0, sizeof (s->opt));
+  memset (s->val, 0, sizeof (s->val));
+
+  for (i = 0; i < NUM_OPTIONS; ++i)
+    {
+      s->opt[i].size = sizeof (SANE_Word);
+      s->opt[i].cap = SANE_CAP_SOFT_SELECT | SANE_CAP_SOFT_DETECT;
+    }
+
+  s->opt[OPT_NUM_OPTS].title = SANE_TITLE_NUM_OPTIONS;
+  s->opt[OPT_NUM_OPTS].desc = SANE_DESC_NUM_OPTIONS;
+  s->opt[OPT_NUM_OPTS].type = SANE_TYPE_INT;
+  s->opt[OPT_NUM_OPTS].cap = SANE_CAP_SOFT_DETECT;
+  s->val[OPT_NUM_OPTS].w = NUM_OPTIONS;
+
+  /* "Mode" group: */
+
+  s->opt[OPT_MODE_GROUP].title = "Scan Mode";
+  s->opt[OPT_MODE_GROUP].desc = "";
+  s->opt[OPT_MODE_GROUP].type = SANE_TYPE_GROUP;
+  s->opt[OPT_MODE_GROUP].cap = 0;
+  s->opt[OPT_MODE_GROUP].constraint_type = SANE_CONSTRAINT_NONE;
+
+  /* scan mode */
+  s->opt[OPT_MODE].name = SANE_NAME_SCAN_MODE;
+  s->opt[OPT_MODE].title = SANE_TITLE_SCAN_MODE;
+  s->opt[OPT_MODE].desc = SANE_DESC_SCAN_MODE;
+  s->opt[OPT_MODE].type = SANE_TYPE_STRING;
+
+  switch (s->hw->type)
+    {
+    case AGFACOLOR:
+      s->opt[OPT_MODE].size = max_string_size (focuscolor_mode_list);
+      s->opt[OPT_MODE].constraint.string_list = focuscolor_mode_list;
+      s->val[OPT_MODE].s = strdup (focuscolor_mode_list[0]);
+      break;
+    case AGFAGRAY256:
+      s->opt[OPT_MODE].size = max_string_size (focusii_mode_list);
+      s->opt[OPT_MODE].constraint.string_list = focusii_mode_list;
+      s->val[OPT_MODE].s = strdup (focusii_mode_list[0]);
+      break;
+    default:
+      s->opt[OPT_MODE].size = max_string_size (focus_mode_list);
+      s->opt[OPT_MODE].constraint.string_list = focus_mode_list;
+      s->val[OPT_MODE].s = strdup (focus_mode_list[0]);
+      break;
+    }
+
+  s->opt[OPT_MODE].constraint_type = SANE_CONSTRAINT_STRING_LIST;
+
+  /* resolution */
+  s->opt[OPT_RESOLUTION].name = SANE_NAME_SCAN_RESOLUTION;
+  s->opt[OPT_RESOLUTION].title = SANE_TITLE_SCAN_RESOLUTION;
+  s->opt[OPT_RESOLUTION].desc = SANE_DESC_SCAN_RESOLUTION;
+  s->opt[OPT_RESOLUTION].type = SANE_TYPE_INT;
+  s->opt[OPT_RESOLUTION].unit = SANE_UNIT_DPI;
+  s->opt[OPT_RESOLUTION].constraint_type = SANE_CONSTRAINT_WORD_LIST;
+  s->opt[OPT_RESOLUTION].constraint.word_list = dpi_list;
+  s->val[OPT_RESOLUTION].w = 100;
+
+  s->opt[OPT_SOURCE].name  = SANE_NAME_SCAN_SOURCE;
+  s->opt[OPT_SOURCE].title = SANE_TITLE_SCAN_SOURCE;
+  s->opt[OPT_SOURCE].desc  = SANE_DESC_SCAN_SOURCE;
+  s->opt[OPT_SOURCE].type  = SANE_TYPE_STRING;
+  s->opt[OPT_SOURCE].unit  = SANE_UNIT_NONE;
+  if (!s->hw->transparent)
+    s->opt[OPT_SOURCE].cap |= SANE_CAP_INACTIVE;
+  else
+    s->opt[OPT_SOURCE].cap &= ~SANE_CAP_INACTIVE;
+  s->opt[OPT_SOURCE].constraint_type = SANE_CONSTRAINT_STRING_LIST;
+  s->opt[OPT_SOURCE].constraint.string_list = source_list;
+  s->opt[OPT_SOURCE].size  = max_string_size (source_list);
+  s->val[OPT_SOURCE].s     = strdup (source_list[0]);
+
+  /* "Geometry" group: */
+  s->opt[OPT_GEOMETRY_GROUP].title = "Geometry";
+  s->opt[OPT_GEOMETRY_GROUP].desc = "";
+  s->opt[OPT_GEOMETRY_GROUP].type = SANE_TYPE_GROUP;
+  s->opt[OPT_GEOMETRY_GROUP].cap = SANE_CAP_ADVANCED;
+  s->opt[OPT_GEOMETRY_GROUP].constraint_type = SANE_CONSTRAINT_NONE;
+
+  /* top-left x */
+  s->opt[OPT_TL_X].name = SANE_NAME_SCAN_TL_X;
+  s->opt[OPT_TL_X].title = SANE_TITLE_SCAN_TL_X;
+  s->opt[OPT_TL_X].desc = SANE_DESC_SCAN_TL_X;
+  s->opt[OPT_TL_X].type = SANE_TYPE_FIXED;
+  s->opt[OPT_TL_X].unit = SANE_UNIT_MM;
+  s->opt[OPT_TL_X].constraint_type = SANE_CONSTRAINT_RANGE;
+  s->opt[OPT_TL_X].constraint.range = &x_range;
+  s->val[OPT_TL_X].w = 0;
+
+  /* top-left y */
+  s->opt[OPT_TL_Y].name = SANE_NAME_SCAN_TL_Y;
+  s->opt[OPT_TL_Y].title = SANE_TITLE_SCAN_TL_Y;
+  s->opt[OPT_TL_Y].desc = SANE_DESC_SCAN_TL_Y;
+  s->opt[OPT_TL_Y].type = SANE_TYPE_FIXED;
+  s->opt[OPT_TL_Y].unit = SANE_UNIT_MM;
+  s->opt[OPT_TL_Y].constraint_type = SANE_CONSTRAINT_RANGE;
+  s->opt[OPT_TL_Y].constraint.range = &y_range;
+  s->val[OPT_TL_Y].w = 0;
+
+  /* bottom-right x */
+  s->opt[OPT_BR_X].name = SANE_NAME_SCAN_BR_X;
+  s->opt[OPT_BR_X].title = SANE_TITLE_SCAN_BR_X;
+  s->opt[OPT_BR_X].desc = SANE_DESC_SCAN_BR_X;
+  s->opt[OPT_BR_X].type = SANE_TYPE_FIXED;
+  s->opt[OPT_BR_X].unit = SANE_UNIT_MM;
+  s->opt[OPT_BR_X].constraint_type = SANE_CONSTRAINT_RANGE;
+  s->opt[OPT_BR_X].constraint.range = &x_range;
+  s->val[OPT_BR_X].w = x_range.max;
+
+  /* bottom-right y */
+  s->opt[OPT_BR_Y].name = SANE_NAME_SCAN_BR_Y;
+  s->opt[OPT_BR_Y].title = SANE_TITLE_SCAN_BR_Y;
+  s->opt[OPT_BR_Y].desc = SANE_DESC_SCAN_BR_Y;
+  s->opt[OPT_BR_Y].type = SANE_TYPE_FIXED;
+  s->opt[OPT_BR_Y].unit = SANE_UNIT_MM;
+  s->opt[OPT_BR_Y].constraint_type = SANE_CONSTRAINT_RANGE;
+  s->opt[OPT_BR_Y].constraint.range = &y_range;
+  s->val[OPT_BR_Y].w = y_range.max;
+
+  /* "Enhancement" group: */
+  s->opt[OPT_ENHANCEMENT_GROUP].title = "Enhancement";
+  s->opt[OPT_ENHANCEMENT_GROUP].desc = "";
+  s->opt[OPT_ENHANCEMENT_GROUP].type = SANE_TYPE_GROUP;
+  s->opt[OPT_ENHANCEMENT_GROUP].cap = 0;
+  s->opt[OPT_ENHANCEMENT_GROUP].constraint_type = SANE_CONSTRAINT_NONE;
+
+  /* exposure */
+  s->opt[OPT_EXPOSURE].name  = "exposure";
+  s->opt[OPT_EXPOSURE].title = "Exposure";
+  s->opt[OPT_EXPOSURE].desc  = "Analog exposure control.";
+  s->opt[OPT_EXPOSURE].type  = SANE_TYPE_INT;
+  s->opt[OPT_EXPOSURE].cap |= SANE_CAP_INACTIVE;
+  s->opt[OPT_EXPOSURE].unit  = SANE_UNIT_PERCENT;
+  s->opt[OPT_EXPOSURE].constraint_type = SANE_CONSTRAINT_RANGE;
+  s->opt[OPT_EXPOSURE].constraint.range = &exposure_range;
+  s->val[OPT_EXPOSURE].w     = 23;
+
+  /* brightness automatic correct */
+  s->opt[OPT_AUTO_BRIGHTNESS].name = "adjust-bright";
+  s->opt[OPT_AUTO_BRIGHTNESS].title = "Automatic brightness correction";
+  s->opt[OPT_AUTO_BRIGHTNESS].desc = "Turns on automatic brightness correction of "
+    "the acquired image. This makes the scanner do a two pass scan to analyse the "
+    "brightness of the image before it's scanned.";
+  s->opt[OPT_AUTO_BRIGHTNESS].type = SANE_TYPE_BOOL;
+  s->val[OPT_AUTO_BRIGHTNESS].b = SANE_FALSE;
+
+  /* contrast automatic correct */
+  s->opt[OPT_AUTO_CONTRAST].name = "adjust-contr";
+  s->opt[OPT_AUTO_CONTRAST].title = "Automatic contrast correction";
+  s->opt[OPT_AUTO_CONTRAST].desc = "Turns on automatic contrast correction of "
+    "the acquired image. This makes the scanner do a two pass scan to analyse "
+    "the contrast of the image to be scanned.";
+  s->opt[OPT_AUTO_CONTRAST].type = SANE_TYPE_BOOL;
+  s->val[OPT_AUTO_CONTRAST].b = SANE_FALSE;
+
+  /* brightness */
+  s->opt[OPT_BRIGHTNESS].name = SANE_NAME_BRIGHTNESS;
+  s->opt[OPT_BRIGHTNESS].title = SANE_TITLE_BRIGHTNESS;
+  s->opt[OPT_BRIGHTNESS].desc = "Controls the brightness of the acquired image. "
+    "When automatic brightness is enabled, this can be used to adjust the selected brightness.";
+  s->opt[OPT_BRIGHTNESS].type = SANE_TYPE_FIXED;
+  s->opt[OPT_BRIGHTNESS].unit = SANE_UNIT_PERCENT;
+  s->opt[OPT_BRIGHTNESS].constraint_type = SANE_CONSTRAINT_RANGE;
+  s->opt[OPT_BRIGHTNESS].constraint.range = &percentage_range;
+  s->val[OPT_BRIGHTNESS].w = 0;
+
+  /* contrast */
+  s->opt[OPT_CONTRAST].name = SANE_NAME_CONTRAST;
+  s->opt[OPT_CONTRAST].title = SANE_TITLE_CONTRAST;
+  s->opt[OPT_CONTRAST].desc = "Controls the contrast of the acquired image. "
+    "When automatic contrast is enabled, this can be used to adjust the selected contrast.";
+  s->opt[OPT_CONTRAST].type = SANE_TYPE_FIXED;
+  s->opt[OPT_CONTRAST].unit = SANE_UNIT_PERCENT;
+  s->opt[OPT_CONTRAST].constraint_type = SANE_CONSTRAINT_RANGE;
+  s->opt[OPT_CONTRAST].constraint.range = &percentage_range;
+  s->val[OPT_CONTRAST].w = 0;
+  
+  /* halftone patterns */
+  s->opt[OPT_HALFTONE_PATTERN].name = SANE_NAME_HALFTONE_PATTERN;
+  s->opt[OPT_HALFTONE_PATTERN].title = SANE_TITLE_HALFTONE_PATTERN;
+  s->opt[OPT_HALFTONE_PATTERN].desc = SANE_DESC_HALFTONE_PATTERN;
+  s->opt[OPT_HALFTONE_PATTERN].type = SANE_TYPE_STRING;
+  s->opt[OPT_HALFTONE_PATTERN].size = 32;
+  s->opt[OPT_HALFTONE_PATTERN].constraint_type = SANE_CONSTRAINT_STRING_LIST;
+  if (s->hw->upload_user_defines)
+    {
+      s->opt[OPT_HALFTONE_PATTERN].constraint.string_list = halftone_upload_list;
+      s->val[OPT_HALFTONE_PATTERN].s = strdup (halftone_upload_list[0]);
+    }
+  else
+    {
+      s->opt[OPT_HALFTONE_PATTERN].constraint.string_list = halftone_list;
+      s->val[OPT_HALFTONE_PATTERN].s = strdup (halftone_list[0]);
+    }
+
+  /* red-attenuation */
+  s->opt[OPT_ATTENUATION_RED].name  = "red-attenuation";
+  s->opt[OPT_ATTENUATION_RED].title = "Red attenuation";
+  s->opt[OPT_ATTENUATION_RED].desc  = "Controls the red attenuation of the acquired image. "
+    "Higher values mean less impact on scanned image.";
+  s->opt[OPT_ATTENUATION_RED].type = SANE_TYPE_FIXED;
+  s->opt[OPT_ATTENUATION_RED].cap |= SANE_CAP_INACTIVE;
+  s->opt[OPT_ATTENUATION_RED].unit = SANE_UNIT_PERCENT;
+  s->opt[OPT_ATTENUATION_RED].constraint_type = SANE_CONSTRAINT_RANGE;
+  s->opt[OPT_ATTENUATION_RED].constraint.range = &attenuation_range;
+  s->val[OPT_ATTENUATION_RED].w = SANE_FIX (50.0);
+
+  /* green-attenuation */
+  s->opt[OPT_ATTENUATION_GREEN].name  = "green-attenuation";
+  s->opt[OPT_ATTENUATION_GREEN].title = "Green attenuation";
+  s->opt[OPT_ATTENUATION_GREEN].desc  = "Controls the green attenuation of the acquired image. "
+    "Higher values mean less impact on scanned image.";
+  s->opt[OPT_ATTENUATION_GREEN].type = SANE_TYPE_FIXED;
+  s->opt[OPT_ATTENUATION_GREEN].cap |= SANE_CAP_INACTIVE;
+  s->opt[OPT_ATTENUATION_GREEN].unit = SANE_UNIT_PERCENT;
+  s->opt[OPT_ATTENUATION_GREEN].constraint_type = SANE_CONSTRAINT_RANGE;
+  s->opt[OPT_ATTENUATION_GREEN].constraint.range = &attenuation_range;
+  s->val[OPT_ATTENUATION_GREEN].w = SANE_FIX (50.0);
+
+  /* blue-attenuation */
+  s->opt[OPT_ATTENUATION_BLUE].name  = "blue-attenuation";
+  s->opt[OPT_ATTENUATION_BLUE].title = "Blue attenuation";
+  s->opt[OPT_ATTENUATION_BLUE].desc  = "Controls the blue attenuation of the acquired image. "
+    "Higher values mean less impact on scanned image.";
+  s->opt[OPT_ATTENUATION_BLUE].type = SANE_TYPE_FIXED;
+  s->opt[OPT_ATTENUATION_BLUE].cap |= SANE_CAP_INACTIVE;
+  s->opt[OPT_ATTENUATION_BLUE].unit = SANE_UNIT_PERCENT;
+  s->opt[OPT_ATTENUATION_BLUE].constraint_type = SANE_CONSTRAINT_RANGE;
+  s->opt[OPT_ATTENUATION_BLUE].constraint.range = &attenuation_range;
+  s->val[OPT_ATTENUATION_BLUE].w = SANE_FIX (50.0);
+
+  /* quality-calibration */
+  s->opt[OPT_QUALITY].name  = SANE_NAME_QUALITY_CAL;
+  s->opt[OPT_QUALITY].title = SANE_TITLE_QUALITY_CAL;
+  s->opt[OPT_QUALITY].desc  = "Controls the calibration that will be done in the "
+        "scanner.  Less calibration result in faster scanner times.";
+  s->opt[OPT_QUALITY].type = SANE_TYPE_STRING;
+  s->opt[OPT_QUALITY].size = 32;
+  if (!s->hw->quality)
+    s->opt[OPT_QUALITY].cap |= SANE_CAP_INACTIVE;
+  else
+    s->opt[OPT_QUALITY].cap &= ~SANE_CAP_INACTIVE;
+  s->opt[OPT_QUALITY].constraint_type = SANE_CONSTRAINT_STRING_LIST;
+  s->opt[OPT_QUALITY].constraint.string_list = quality_list;
+  s->val[OPT_QUALITY].s = strdup (quality_list[1]);
+
+  /* sharpening */
+  s->opt[OPT_SHARPEN].name = "sharpen";
+  s->opt[OPT_SHARPEN].title = "Sharpening";
+  s->opt[OPT_SHARPEN].desc = "Controls the sharpening that will be "
+    "done by the video processor in the scanner.";
+  s->opt[OPT_SHARPEN].type = SANE_TYPE_INT;
+  s->opt[OPT_SHARPEN].unit = SANE_UNIT_NONE;
+  s->opt[OPT_SHARPEN].constraint_type = SANE_CONSTRAINT_RANGE;
+  s->opt[OPT_SHARPEN].constraint.range = &sharpen_range;
+  s->val[OPT_SHARPEN].w = 1;
+
+  return SANE_STATUS_GOOD;
+}
+
+static SANE_Status
+attach_one (const char *dev)
+{
+  attach (dev, 0);
+  return SANE_STATUS_GOOD;
+}
+
+SANE_Status
+sane_init (SANE_Int * version_code, SANE_Auth_Callback authorize)
+{
+  char dev_name[PATH_MAX];
+  size_t len;
+  FILE *fp;
+
+  authorize = authorize;		/* silence gcc */
+
+  DBG_INIT ();
+
+  sanei_thread_init ();
+
+  if (version_code)
+    *version_code = SANE_VERSION_CODE (SANE_CURRENT_MAJOR, V_MINOR, 0);
+
+  fp = sanei_config_open ("agfafocus.conf");
+  if (!fp)
+    {
+      /* default to /dev/scanner instead of insisting on config file */
+      attach ("/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);
+  return SANE_STATUS_GOOD;
+}
+
+void
+sane_exit (void)
+{
+  AgfaFocus_Device *dev, *next;
+
+  for (dev = agfafocus_devices; dev; dev = next)
+    {
+      next = dev->next;
+      if (dev->handle)
+	sane_close (dev->handle);
+      free (dev);
+    }
+}
+
+SANE_Status
+sane_get_devices (const SANE_Device *** device_list, SANE_Bool local_only)
+{
+  static const SANE_Device **devlist = 0;
+  AgfaFocus_Device *dev;
+  int i;
+
+  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;
+
+  for (dev = agfafocus_devices, i = 0; i < num_devices; dev = dev->next)
+    devlist[i++] = &dev->sane;
+  devlist[i++] = 0;
+
+  *device_list = devlist;
+  return SANE_STATUS_GOOD;
+}
+
+SANE_Status
+sane_open (SANE_String_Const devicename, SANE_Handle * handle)
+{
+  AgfaFocus_Device *dev;
+  SANE_Status status;
+  AgfaFocus_Scanner *s;
+
+  if (devicename[0])
+    {
+      status = attach (devicename, &dev);
+      if (status != SANE_STATUS_GOOD)
+	return status;
+    }
+  else
+    {
+      /* empty devicname -> use first device */
+      dev = agfafocus_devices;
+    }
+
+  if (!dev)
+    return SANE_STATUS_INVAL;
+
+  if (dev->handle)
+    return SANE_STATUS_DEVICE_BUSY;
+
+  s = malloc (sizeof (*s));
+  if (!s)
+    return SANE_STATUS_NO_MEM;
+
+  memset (s, 0, sizeof (*s));
+  s->scanning = SANE_FALSE;
+
+  s->fd = -1;
+  s->hw = dev;
+  s->hw->handle = s;
+
+  init_options (s);
+
+  *handle = s;
+  return SANE_STATUS_GOOD;
+}
+
+void
+sane_close (SANE_Handle handle)
+{
+  AgfaFocus_Scanner *s = handle;
+
+  if (s->scanning)
+    do_cancel (handle);
+
+  s->hw->handle = 0;
+
+  free (handle);
+}
+
+const SANE_Option_Descriptor *
+sane_get_option_descriptor (SANE_Handle handle, SANE_Int option)
+{
+  AgfaFocus_Scanner *s = handle;
+
+  if ((unsigned) option >= NUM_OPTIONS)
+    return 0;
+  return s->opt + option;
+}
+
+SANE_Status
+sane_control_option (SANE_Handle handle, SANE_Int option,
+		     SANE_Action action, void *val, SANE_Int * info)
+{
+  AgfaFocus_Scanner *s = handle;
+  SANE_Status status;
+
+  if (info)
+    *info = 0;
+
+  if (s->scanning)
+    return SANE_STATUS_DEVICE_BUSY;
+
+  if (option >= NUM_OPTIONS || !SANE_OPTION_IS_ACTIVE (s->opt[option].cap))
+    return SANE_STATUS_UNSUPPORTED;
+
+  if (action == SANE_ACTION_GET_VALUE)
+    {
+      switch (option)
+	{
+	case OPT_RESOLUTION:
+	case OPT_TL_X:
+	case OPT_TL_Y:
+	case OPT_BR_X:
+	case OPT_BR_Y:
+	case OPT_NUM_OPTS:
+	case OPT_BRIGHTNESS:
+	case OPT_CONTRAST:
+	case OPT_SHARPEN:
+	case OPT_EXPOSURE:
+	case OPT_ATTENUATION_RED:
+	case OPT_ATTENUATION_GREEN:
+	case OPT_ATTENUATION_BLUE:
+	  *(SANE_Word *) val = s->val[option].w;
+	  break;
+	case OPT_AUTO_BRIGHTNESS:
+	case OPT_AUTO_CONTRAST:
+	  *(SANE_Bool *) val = s->val[option].b;
+	  break;
+        case OPT_MODE:
+	case OPT_HALFTONE_PATTERN:
+	case OPT_QUALITY:
+	case OPT_SOURCE:
+          strcpy (val, s->val[option].s);
+          return (SANE_STATUS_GOOD);
+	default:
+	  return SANE_STATUS_UNSUPPORTED;
+	}
+
+    }
+  else if (action == SANE_ACTION_SET_VALUE)
+    {
+      if (!SANE_OPTION_IS_SETTABLE (s->opt[option].cap))
+	return SANE_STATUS_UNSUPPORTED;
+
+      status = sanei_constrain_value (s->opt + option, val, info);
+      if (status != SANE_STATUS_GOOD)
+	return status;
+
+      switch (option)
+	{
+	case OPT_RESOLUTION:
+	case OPT_TL_X:
+	case OPT_TL_Y:
+	case OPT_BR_X:
+	case OPT_BR_Y:
+	  if (info)
+	    *info |= SANE_INFO_RELOAD_PARAMS;
+	case OPT_SHARPEN:
+	case OPT_EXPOSURE:
+	case OPT_ATTENUATION_RED:
+	case OPT_ATTENUATION_GREEN:
+	case OPT_ATTENUATION_BLUE:
+	case OPT_BRIGHTNESS:
+	case OPT_CONTRAST:
+	  s->val[option].w = *(SANE_Word *) val;
+	  break;
+	case OPT_AUTO_BRIGHTNESS:
+	case OPT_AUTO_CONTRAST:
+	  s->val[option].b = *(SANE_Bool *) val;
+	  break;
+        case OPT_MODE:
+	  if (strcmp (s->val[option].s, (SANE_String) val))
+	    {
+	      if (info)
+		*info |= SANE_INFO_RELOAD_OPTIONS | SANE_INFO_RELOAD_PARAMS;
+
+	      if (s->val[option].s)
+		free (s->val[option].s);
+
+	      s->val[option].s = strdup (val);
+
+	      if (strcmp (s->val[option].s, "Gray (6 bit)") == 0)
+		s->mode = GRAY6BIT;	
+	      else if (strcmp (s->val[option].s, "Gray (8 bit)") == 0)
+		s->mode = GRAY8BIT;	
+	      else if (strcmp (s->val[option].s, "Color (18 bit)") == 0)
+		s->mode = COLOR18BIT;	
+	      else if (strcmp (s->val[option].s, "Color (24 bit)") == 0)
+		s->mode = COLOR24BIT;	
+	      else
+		s->mode = LINEART;
+    
+	      switch (s->mode)
+		{
+		case LINEART:
+		  s->opt[OPT_HALFTONE_PATTERN].cap &= ~SANE_CAP_INACTIVE;
+		  s->opt[OPT_SHARPEN].cap &= ~SANE_CAP_INACTIVE;
+		  s->opt[OPT_EXPOSURE].cap |= SANE_CAP_INACTIVE;
+		  s->opt[OPT_ATTENUATION_RED].cap |= SANE_CAP_INACTIVE;
+		  s->opt[OPT_ATTENUATION_GREEN].cap |= SANE_CAP_INACTIVE;
+		  s->opt[OPT_ATTENUATION_BLUE].cap |= SANE_CAP_INACTIVE;
+		  s->opt[OPT_BRIGHTNESS].cap &= ~SANE_CAP_INACTIVE;
+		  s->opt[OPT_CONTRAST].cap &= ~SANE_CAP_INACTIVE;
+		  s->opt[OPT_AUTO_BRIGHTNESS].cap &= ~SANE_CAP_INACTIVE;
+		  s->opt[OPT_AUTO_CONTRAST].cap &= ~SANE_CAP_INACTIVE;
+		  break;
+
+		case GRAY6BIT:
+		  s->opt[OPT_SHARPEN].cap &= ~SANE_CAP_INACTIVE;
+		  s->opt[OPT_EXPOSURE].cap |= SANE_CAP_INACTIVE;
+		  s->opt[OPT_ATTENUATION_RED].cap |= SANE_CAP_INACTIVE;
+		  s->opt[OPT_ATTENUATION_GREEN].cap |= SANE_CAP_INACTIVE;
+		  s->opt[OPT_ATTENUATION_BLUE].cap |= SANE_CAP_INACTIVE;
+		  s->opt[OPT_BRIGHTNESS].cap &= ~SANE_CAP_INACTIVE;
+		  s->opt[OPT_CONTRAST].cap &= ~SANE_CAP_INACTIVE;
+		  s->opt[OPT_AUTO_BRIGHTNESS].cap &= ~SANE_CAP_INACTIVE;
+		  s->opt[OPT_AUTO_CONTRAST].cap &= ~SANE_CAP_INACTIVE;
+		  s->opt[OPT_HALFTONE_PATTERN].cap |= SANE_CAP_INACTIVE;
+		  break;
+
+		case GRAY8BIT:
+		  s->opt[OPT_BRIGHTNESS].cap &= ~SANE_CAP_INACTIVE;
+		  s->opt[OPT_CONTRAST].cap &= ~SANE_CAP_INACTIVE;
+		  s->opt[OPT_AUTO_BRIGHTNESS].cap &= ~SANE_CAP_INACTIVE;
+		  s->opt[OPT_AUTO_CONTRAST].cap &= ~SANE_CAP_INACTIVE;
+		  s->opt[OPT_EXPOSURE].cap |= SANE_CAP_INACTIVE;
+		  s->opt[OPT_ATTENUATION_RED].cap |= SANE_CAP_INACTIVE;
+		  s->opt[OPT_ATTENUATION_GREEN].cap |= SANE_CAP_INACTIVE;
+		  s->opt[OPT_ATTENUATION_BLUE].cap |= SANE_CAP_INACTIVE;
+		  s->opt[OPT_HALFTONE_PATTERN].cap |= SANE_CAP_INACTIVE;
+		  s->opt[OPT_SHARPEN].cap |= SANE_CAP_INACTIVE;
+		  break;
+
+		case COLOR18BIT:
+		  s->opt[OPT_EXPOSURE].cap &= ~SANE_CAP_INACTIVE;
+		  s->opt[OPT_ATTENUATION_RED].cap &= ~SANE_CAP_INACTIVE;
+		  s->opt[OPT_ATTENUATION_GREEN].cap &= ~SANE_CAP_INACTIVE;
+		  s->opt[OPT_ATTENUATION_BLUE].cap &= ~SANE_CAP_INACTIVE;
+		  s->opt[OPT_BRIGHTNESS].cap |=  SANE_CAP_INACTIVE;
+		  s->opt[OPT_CONTRAST].cap |=  SANE_CAP_INACTIVE;
+		  s->opt[OPT_AUTO_BRIGHTNESS].cap |= SANE_CAP_INACTIVE;
+		  s->opt[OPT_AUTO_CONTRAST].cap |= SANE_CAP_INACTIVE;
+		  s->opt[OPT_SHARPEN].cap &= ~SANE_CAP_INACTIVE;
+		  s->opt[OPT_HALFTONE_PATTERN].cap |= SANE_CAP_INACTIVE;
+		  break;
+
+		case COLOR24BIT:
+		  s->opt[OPT_EXPOSURE].cap &= ~SANE_CAP_INACTIVE;
+		  s->opt[OPT_ATTENUATION_RED].cap &= ~SANE_CAP_INACTIVE;
+		  s->opt[OPT_ATTENUATION_GREEN].cap &= ~SANE_CAP_INACTIVE;
+		  s->opt[OPT_ATTENUATION_BLUE].cap &= ~SANE_CAP_INACTIVE;
+		  s->opt[OPT_BRIGHTNESS].cap |=  SANE_CAP_INACTIVE;
+		  s->opt[OPT_CONTRAST].cap |=  SANE_CAP_INACTIVE;
+		  s->opt[OPT_AUTO_BRIGHTNESS].cap |= SANE_CAP_INACTIVE;
+		  s->opt[OPT_AUTO_CONTRAST].cap |= SANE_CAP_INACTIVE;
+		  s->opt[OPT_SHARPEN].cap |= SANE_CAP_INACTIVE;
+		  s->opt[OPT_HALFTONE_PATTERN].cap |= SANE_CAP_INACTIVE;
+		  break;
+		}
+	    }
+	  break;
+	case OPT_SOURCE:
+	case OPT_QUALITY:
+	case OPT_HALFTONE_PATTERN:
+          if (info && strcmp (s->val[option].s, (SANE_String) val))
+            *info |= SANE_INFO_RELOAD_OPTIONS | SANE_INFO_RELOAD_PARAMS;
+          if (s->val[option].s)
+            free (s->val[option].s);
+          s->val[option].s = strdup (val);
+	  break;
+	default:
+	  return SANE_STATUS_UNSUPPORTED;
+	}
+
+    }
+  else
+    {
+      return SANE_STATUS_UNSUPPORTED;
+    }
+
+  return SANE_STATUS_GOOD;
+}
+
+SANE_Status
+sane_get_parameters (SANE_Handle handle, SANE_Parameters * params)
+{
+  AgfaFocus_Scanner *s = handle;
+
+  if (!s->scanning)
+    {
+      double width, height, dpi;
+      const char *quality;
+      const char *original;
+
+      memset (&s->params, 0, sizeof (s->params));
+
+      width = SANE_UNFIX (s->val[OPT_BR_X].w - s->val[OPT_TL_X].w);
+      height = SANE_UNFIX (s->val[OPT_BR_Y].w - s->val[OPT_TL_Y].w);
+      dpi = s->val[OPT_RESOLUTION].w;
+
+      /* make best-effort guess at what parameters will look like once
+         scanning starts.  */
+      if (dpi > 0.0 && width > 0.0 && height > 0.0)
+	{
+	  double dots_per_mm = dpi / MM_PER_INCH;
+
+	  s->params.pixels_per_line = width * dots_per_mm + 0.5;
+	  s->params.lines = height * dots_per_mm + 0.5;
+	}
+
+      /* Should we specify calibration quality? */
+
+      if (SANE_OPTION_IS_ACTIVE (s->opt[OPT_QUALITY].cap))
+        {
+          DBG(3, " -------------- setting quality\n");
+          quality = s->val[OPT_QUALITY].s;
+          if (strcmp (quality, "Low") == 0 )
+	    s->quality = 255;
+          else if (strcmp (quality, "High") == 0)
+	    s->quality = 1;
+          else
+	    s->quality = 0;
+        }
+      else
+        s->quality = 0;
+
+      /* Should we select source type? */
+
+      if (SANE_OPTION_IS_ACTIVE (s->opt[OPT_SOURCE].cap))
+        {
+          DBG(3, " -------------- setting source\n");
+          original = s->val[OPT_SOURCE].s;
+          if (strcmp (original, "Transparency") == 0)
+	    s->original = 0;
+          else
+	    s->original = 1;
+        }
+      else
+        s->original = 0;
+
+      s->exposure = ((s->val[OPT_EXPOSURE].w * (255.0f - 80.0f)) / 100.0f) + 80.0f;
+      s->r_att = (SANE_UNFIX (s->val[OPT_ATTENUATION_RED].w) * 20.0f) / 100.0f;
+      s->g_att = (SANE_UNFIX (s->val[OPT_ATTENUATION_GREEN].w) * 20.0f) / 100.0f;
+      s->b_att = (SANE_UNFIX (s->val[OPT_ATTENUATION_BLUE].w) * 20.0f) / 100.0f;
+      s->tonecurve = 0;
+
+      switch (s->mode)
+	{
+	case LINEART:
+	  {
+	    const char *halftone;
+	    
+	    s->image_composition = 0;
+	    
+	    /* in 1 bpp mode, lines need to be 8 pixel length */
+	    
+	    if (s->params.pixels_per_line % 8)
+	      s->params.pixels_per_line += 8 - (s->params.pixels_per_line % 8);
+	    
+	    s->params.format = SANE_FRAME_GRAY;
+	    s->params.bytes_per_line = s->params.pixels_per_line / 8;
+	    s->bpp = s->params.depth = 1;
+	    
+	    halftone = s->val[OPT_HALFTONE_PATTERN].s;
+	    if (strcmp (halftone, "1") == 0 )
+	      s->halftone = 1;
+	    else if (strcmp (halftone, "Dispersed dot 4x4") == 0)
+	      s->halftone = 2;
+	    else if (strcmp (halftone, "Round (Clustered dot 4x4)") == 0)
+	      s->halftone = 3;
+	    else if (strcmp (halftone, "Diamond (Clustered dot 4x4)") == 0)
+	      s->halftone = 4;
+	    else if (strcmp (halftone, "User defined") == 0)
+	      s->halftone = 5;
+	    else
+	      s->halftone = 0;
+	    
+	    s->edge = s->val[OPT_SHARPEN].w;
+	  }
+	  break;
+
+	case GRAY6BIT:
+	  s->image_composition = 2;
+	  
+          s->params.format = SANE_FRAME_GRAY;
+          s->params.bytes_per_line = s->params.pixels_per_line;
+	  s->bpp = 6;
+	  s->params.depth = 8;
+	  s->edge = s->val[OPT_SHARPEN].w;
+
+	  break;
+
+	case GRAY8BIT:
+	  s->image_composition = 2;
+	  
+          s->params.format = SANE_FRAME_GRAY;
+          s->params.bytes_per_line = s->params.pixels_per_line;
+	  s->bpp = s->params.depth = 8;
+
+	  break;
+
+	case COLOR18BIT:
+	  s->image_composition = 5;
+
+          s->params.format = SANE_FRAME_RED;
+          s->params.bytes_per_line = s->params.pixels_per_line;
+	  s->bpp = 6;
+	  s->params.depth = 8;
+	  s->edge = s->val[OPT_SHARPEN].w;
+
+	  break;
+
+	case COLOR24BIT:
+	  s->image_composition = 5;
+
+          s->params.format = SANE_FRAME_RED;
+          s->params.bytes_per_line = s->params.pixels_per_line;
+          s->bpp = s->params.depth = 8;
+
+	  break;
+        }
+
+      s->pass = 0;
+
+      /*s->params.bytes_per_line =
+	(s->params.pixels_per_line + (8 - s->params.depth))
+	/ (8 / s->params.depth);*/
+    }
+  else
+    if (s->mode == COLOR18BIT ||
+	s->mode == COLOR24BIT)
+      s->params.format = SANE_FRAME_RED + s->pass;
+  
+  s->params.last_frame = (s->params.format != SANE_FRAME_RED && s->params.format != SANE_FRAME_GREEN);
+  
+  if (params)
+    *params = s->params;
+  return SANE_STATUS_GOOD;
+}
+
+/* This function is executed as a child process.  The reason this is
+   executed as a subprocess is because some (most?) generic SCSI
+   interfaces block a SCSI request until it has completed.  With a
+   subprocess, we can let it block waiting for the request to finish
+   while the main process can go about to do more important things
+   (such as recognizing when the user presses a cancel button).
+
+
+   WARNING: Since this is executed as a subprocess, it's NOT possible
+   to update any of the variables in the main process (in particular
+   the scanner state cannot be updated).  */
+static int
+reader_process (void *scanner)
+{
+  AgfaFocus_Scanner *s = (AgfaFocus_Scanner *) scanner;
+  int fd = s->reader_pipe;
+
+  SANE_Status status;
+  SANE_Byte *data;
+  int lines_read = 0;
+  int lines_per_buffer;
+  int bytes_per_line = 0, total_lines = 0;
+  int i;
+  sigset_t sigterm_set;
+  sigset_t ignore_set;
+  struct SIGACTION act;
+
+  if (sanei_thread_is_forked()) close (s->pipe);
+
+  sigfillset (&ignore_set);
+  sigdelset (&ignore_set, SIGTERM);
+#if defined (__APPLE__) && defined (__MACH__)
+  sigdelset (&ignore_set, SIGUSR2);
+#endif
+  sigprocmask (SIG_SETMASK, &ignore_set, 0);
+
+  memset (&act, 0, sizeof (act));
+  sigaction (SIGTERM, &act, 0);
+
+  sigemptyset (&sigterm_set);
+  sigaddset (&sigterm_set, SIGTERM);
+
+  if (!s->hw->disconnect)
+    wait_ready (s->fd);
+
+  status = get_read_sizes (s->fd, &s->lines_available, &bytes_per_line, &total_lines);
+  if (status != SANE_STATUS_GOOD)
+    {
+      DBG (1, "open: get_read_sizes() failed: %s\n",
+	   sane_strstatus (status));
+      do_cancel (s);
+      close (fd);
+      return 1;
+    }
+
+  if (!s->lines_available || !bytes_per_line || !total_lines || bytes_per_line < s->params.bytes_per_line)
+    {
+      DBG (1, "open: invalid sizes: %d, %d, %d\n",
+	   s->lines_available, bytes_per_line, total_lines);
+      do_cancel (s);
+      close (fd);
+      return 1;
+    }
+
+  lines_per_buffer = sanei_scsi_max_request_size / bytes_per_line;
+  if (!lines_per_buffer)
+    {
+      close (fd);
+      return 2;			/* resolution is too high */
+    }
+
+  data = malloc (lines_per_buffer * bytes_per_line);
+  if (!data)
+    {
+      DBG (1, "open  malloc(%lu) failed.\n", (u_long) lines_per_buffer * bytes_per_line);
+      do_cancel (s);
+      close (fd);
+      return 1;
+    }
+
+  while (lines_read < s->params.lines)
+    {
+      int lines = lines_per_buffer;
+
+      if (s->lines_available == 0)
+	{
+	  /* No lines in scanner?  Scan some more */
+	  status = request_more_data (s);
+	  
+	  if (status != SANE_STATUS_GOOD)
+	    {
+	      close (fd);
+	      return 1;
+	    }
+	}
+      
+      /* We only request as many lines as there are already scanned */
+      if (lines > s->lines_available)
+	lines = s->lines_available;
+
+      DBG (1, "Requesting %d lines, in scanner: %d, total: %d\n", lines,
+	   s->lines_available, s->params.lines);
+  
+      status = read_data (s, data, lines, bytes_per_line);
+      
+      if (status != SANE_STATUS_GOOD)
+	{
+	  DBG (1, "sane_read: read_data() failed (%s)\n",
+	       sane_strstatus (status));
+	  do_cancel (s);
+	  close (fd);
+	  return 1;
+	}
+      
+      /* Sometimes the scanner will return more bytes per line than
+         requested, so we copy only what we wanted. */
+      
+      for (i = 0; i < lines; i++)
+	if (write (fd, data + i * bytes_per_line, s->params.bytes_per_line) != s->params.bytes_per_line)
+	  {
+	    do_cancel (s);
+	    close (fd);
+	    return 1;
+	  }
+
+      lines_read += lines;
+    }
+  
+  close (fd);
+  return 0;
+}
+
+SANE_Status
+sane_start (SANE_Handle handle)
+{
+  AgfaFocus_Scanner *s = handle;
+  SANE_Status status;
+  int fds[2];
+  
+  /* First make sure we have a current parameter set.  Some of the
+     parameters will be overwritten below, but that's OK.  */
+  
+  status = sane_get_parameters (s, 0);
+  if (status != SANE_STATUS_GOOD)
+    return status;
+  
+  /* don't initialise scanner if we're doing a three-pass scan */
+
+  if (s->pass == 0)
+    {
+      if (s->fd < 0)
+	{
+	  status = sanei_scsi_open (s->hw->sane.name, &s->fd, sense_handler, 0);
+	  if (status != SANE_STATUS_GOOD)
+	    {
+	      DBG (1, "open: open of %s failed: %s\n",
+		   s->hw->sane.name, sane_strstatus (status));
+	      s->fd = -1;
+	      return status;
+	    }
+	}
+
+      status = test_ready (s->fd);
+      if (status != SANE_STATUS_GOOD)
+	{
+	  DBG (1, "open: test_ready() failed: %s\n", sane_strstatus (status));
+	  sanei_scsi_close (s->fd);
+	  s->fd = -1;
+	  return status;
+	}
+
+      status = reserve_unit (s->fd);
+      if (status != SANE_STATUS_GOOD)
+	{
+	  DBG (1, "open: reserve_unit() failed: %s\n", sane_strstatus (status));
+	  sanei_scsi_close (s->fd);
+	  s->fd = -1;
+	  return status;
+	}
+
+      status = set_window (s);
+      if (status != SANE_STATUS_GOOD)
+	{
+	  DBG (1, "open: set_window() failed: %s\n", sane_strstatus (status));
+	  release_unit (s->fd);
+	  sanei_scsi_close (s->fd);
+	  s->fd = -1;
+	  return status;
+	}
+
+      {
+	int matrix[256] = {
+	   2, 60, 16, 56,  3, 57, 13, 53,
+	  34, 18, 48, 32, 35, 19, 45, 29,
+	  10, 50,  6, 63, 11, 51,  7, 61,
+	  42, 26, 38, 22, 43, 27, 39, 23,
+	   4, 58, 14, 54,  1, 59, 15, 55,
+	  36, 20, 46, 30, 33, 17, 47, 31,
+	  12, 52,  8, 62,  9, 49,  5, 63, 
+	  44, 28, 40, 24, 41, 25, 37, 21
+	};
+	
+	status = upload_dither_matrix (s, 8, 8, matrix);
+	if (status != SANE_STATUS_GOOD)
+	  {
+	    DBG (1, "open: upload_dither_matrix() failed: %s\n", sane_strstatus (status));
+	    release_unit (s->fd);
+	    sanei_scsi_close (s->fd);
+	    s->fd = -1;
+	    return status;
+	  }
+      }
+
+      s->scanning = SANE_TRUE;
+
+      status = start_scan (s->fd, SANE_FALSE);
+      if (status != SANE_STATUS_GOOD)
+	{
+	  DBG (1, "open: start_scan() failed: %s\n", sane_strstatus (status));
+	  do_cancel (s);
+	  return status;
+	}
+    }
+  else
+    {
+      /* continue three-pass scan */
+
+      status = start_scan (s->fd, SANE_TRUE);
+      if (status != SANE_STATUS_GOOD)
+	{
+	  DBG (1, "open: start_scan() failed: %s\n", sane_strstatus (status));
+	  do_cancel (s);
+	  return status;
+	}
+    }
+
+  if (pipe (fds) < 0)
+    return SANE_STATUS_IO_ERROR;
+
+  s->pipe = fds[0];
+  s->reader_pipe = fds[1];
+  s->reader_pid = sanei_thread_begin (reader_process, (void *) s);
+
+  if (sanei_thread_is_forked()) close (s->reader_pipe);
+
+  return SANE_STATUS_GOOD;
+}
+
+SANE_Status
+sane_read (SANE_Handle handle, SANE_Byte * buf, SANE_Int max_len,
+	   SANE_Int * len)
+{
+  AgfaFocus_Scanner *s = handle;
+  ssize_t nread;
+
+  *len = 0;
+
+  nread = read (s->pipe, buf, max_len);
+  DBG (3, "read %ld bytes\n", (long) nread);
+
+  if (!s->scanning)
+    return do_cancel (s);
+  
+  if (nread < 0) {
+    if (errno == EAGAIN) {
+      return SANE_STATUS_GOOD;
+    } else {
+      do_cancel (s);
+      return SANE_STATUS_IO_ERROR;
+    }
+  }
+
+  *len = nread;
+
+  if (nread == 0) {
+    s->pass++;
+    return do_eof (s);
+  }
+  return SANE_STATUS_GOOD;
+}
+
+void
+sane_cancel (SANE_Handle handle)
+{
+  AgfaFocus_Scanner *s = handle;
+
+  if (s->reader_pid != -1)
+    sanei_thread_kill (s->reader_pid);
+  s->scanning = SANE_FALSE;
+}
+
+SANE_Status
+sane_set_io_mode (SANE_Handle handle, SANE_Bool non_blocking)
+{
+  AgfaFocus_Scanner *s = handle;
+
+  if (!s->scanning)
+    return SANE_STATUS_INVAL;
+
+  if (fcntl (s->pipe, F_SETFL, non_blocking ? O_NONBLOCK : 0) < 0)
+    return SANE_STATUS_IO_ERROR;
+
+  return SANE_STATUS_GOOD;
+}
+
+SANE_Status
+sane_get_select_fd (SANE_Handle handle, SANE_Int * fd)
+{
+  AgfaFocus_Scanner *s = handle;
+
+  if (!s->scanning)
+    return SANE_STATUS_INVAL;
+
+  *fd = s->pipe;
+  return SANE_STATUS_GOOD;
+}