Initial import of sane-backends version 1.0.24-1.2

1 files changed, 1486 insertions, 0 deletions

diff --git a/backend/niash.c b/backend/niash.c
new file mode 100644
index 0000000..7bc8a25
--- /dev/null
+++ b/backend/niash.c
@@ -0,0 +1,1486 @@
+/*
+  Copyright (C) 2001 Bertrik Sikken (bertrik@zonnet.nl)
+
+  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.
+
+  $Id$
+*/
+
+/*
+    Concept for a backend for scanners based on the NIASH chipset,
+    such as HP3300C, HP3400C, HP4300C, Agfa Touch.
+    Parts of this source were inspired by other backends.
+*/
+
+#include "../include/sane/config.h"
+#include "../include/sane/sane.h"
+#include "../include/sane/sanei.h"
+#include "../include/sane/sanei_backend.h"
+#include "../include/sane/sanei_config.h"
+#include "../include/sane/saneopts.h"
+
+#include <stdlib.h>             /* malloc, free */
+#include <string.h>             /* memcpy */
+#include <stdio.h>
+#include <sys/time.h>
+#include <sys/wait.h>
+
+/* definitions for debug */
+#define BACKEND_NAME niash
+#define BUILD 1
+
+#define DBG_ASSERT  1
+#define DBG_ERR     16
+#define DBG_MSG     32
+
+/* Just to avoid conflicts between niash backend and testtool */
+#define WITH_NIASH 1
+
+
+/* (source) includes for data transfer methods */
+#define STATIC static
+
+#include "niash_core.c"
+#include "niash_xfer.c"
+
+
+#define ASSERT(cond) (!(cond) ? DBG(DBG_ASSERT, "!!! ASSERT(%S) FAILED!!!\n",STRINGIFY(cond));)
+
+
+#define MM_TO_PIXEL(_mm_, _dpi_)    ((_mm_) * (_dpi_) / 25.4 )
+#define PIXEL_TO_MM(_pixel_, _dpi_) ((_pixel_) * 25.4 / (_dpi_) )
+
+
+/* options enumerator */
+typedef enum
+{
+  optCount = 0,
+
+  optGroupGeometry,
+  optTLX, optTLY, optBRX, optBRY,
+  optDPI,
+
+  optGroupImage,
+  optGammaTable,                /* gamma table */
+
+  optGroupMode,
+  optMode,
+
+  optGroupEnhancement,
+  optThreshold,
+
+
+  optLast,
+/* put temporarily disabled options here after optLast */
+
+  optGroupMisc,
+  optLamp,
+
+  optCalibrate,
+  optGamma                      /* analog gamma = single number */
+} EOptionIndex;
+
+
+typedef union
+{
+  SANE_Word w;
+  SANE_Word *wa;                /* word array */
+  SANE_String s;
+} TOptionValue;
+
+#define HW_GAMMA_SIZE 4096
+#define SANE_GAMMA_SIZE 4096
+
+typedef struct
+{
+  SANE_Option_Descriptor aOptions[optLast];
+  TOptionValue aValues[optLast];
+
+  TScanParams ScanParams;
+  THWParams HWParams;
+
+  TDataPipe DataPipe;
+  int iLinesLeft;               /* lines to scan */
+  int iBytesLeft;               /* bytes to read */
+  int iPixelsPerLine;           /* pixels in one scan line */
+
+  SANE_Int aGammaTable[SANE_GAMMA_SIZE];        /* a 12-to-8 bit color lookup table */
+
+  /* fCancelled needed to let sane issue the cancel message
+     instead of an error message */
+  SANE_Bool fCancelled;         /* SANE_TRUE if scanning cancelled */
+
+  SANE_Bool fScanning;          /* SANE_TRUE if actively scanning */
+
+  int WarmUpTime;               /* time to wait before a calibration starts */
+  unsigned char CalWhite[3];    /* values for the last calibration of white */
+  struct timeval WarmUpStarted;
+  /* system type to trace the time elapsed */
+} TScanner;
+
+
+/* linked list of SANE_Device structures */
+typedef struct TDevListEntry
+{
+  struct TDevListEntry *pNext;
+  SANE_Device dev;
+} TDevListEntry;
+
+
+static TDevListEntry *_pFirstSaneDev = 0;
+static int iNumSaneDev = 0;
+static const SANE_Device **_pSaneDevList = 0;
+
+
+/* option constraints */
+static const SANE_Range rangeGammaTable = { 0, 255, 1 };
+
+/* available scanner resolutions */
+static const SANE_Int setResolutions[] = { 4, 75, 150, 300, 600 };
+
+/* range of an analog gamma */
+static const SANE_Range rangeGamma = { SANE_FIX (0.25), SANE_FIX (4.0),
+  SANE_FIX (0.0)
+};
+
+/* interpolate a sane gamma table to a hardware appropriate one
+   just in case the sane gamma table would be smaller */
+static void
+_ConvertGammaTable (SANE_Word * saneGamma, unsigned char *hwGamma)
+{
+  int i;
+  int current = 0;
+  for (i = 0; i < SANE_GAMMA_SIZE; ++i)
+    {
+      int j;
+      int next;
+
+      /* highest range of copy indices */
+      next = ((i + 1) * HW_GAMMA_SIZE) / SANE_GAMMA_SIZE;
+
+      /* always copy the first */
+      hwGamma[current] = saneGamma[i];
+
+      /* the interpolation of the rest depends on the gap */
+      for (j = current + 1; j < HW_GAMMA_SIZE && j < next; ++j)
+        {
+          hwGamma[j] =
+            (saneGamma[i] * (next - j) +
+             saneGamma[i + 1] * (j - current)) / (next - current);
+        }
+      current = next;
+    }
+}
+
+/* create a unity gamma table */
+static void
+_UnityGammaTable (unsigned char *hwGamma)
+{
+  int i;
+  for (i = 0; i < HW_GAMMA_SIZE; ++i)
+    {
+      hwGamma[i] = (i * 256) / HW_GAMMA_SIZE;
+    }
+
+}
+
+static const SANE_Range rangeXmm = { 0, 220, 1 };
+static const SANE_Range rangeYmm = { 0, 296, 1 };
+static const SANE_Int startUpGamma = SANE_FIX (1.6);
+
+static const char colorStr[] = { SANE_VALUE_SCAN_MODE_COLOR };
+static const char grayStr[] = { SANE_VALUE_SCAN_MODE_GRAY };
+static const char lineartStr[] = { SANE_VALUE_SCAN_MODE_LINEART };
+
+#define DEPTH_LINEART  1
+#define DEPTH_GRAY     8
+#define DEPTH_COLOR    8
+
+#define BYTES_PER_PIXEL_GRAY   1
+#define BYTES_PER_PIXEL_COLOR  3
+
+#define BITS_PER_PIXEL_LINEART 1
+#define BITS_PER_PIXEL_GRAY    DEPTH_GRAY
+#define BITS_PER_PIXEL_COLOR   (DEPTH_COLOR*3)
+
+#define BITS_PER_BYTE  8
+#define BITS_PADDING   (BITS_PER_BYTE-1)
+
+#define MODE_COLOR   0
+#define MODE_GRAY    1
+#define MODE_LINEART 2
+
+/* lineart treshold range */
+static const SANE_Range rangeThreshold = {
+  0,
+  100,
+  1
+};
+
+/* scanning modes */
+static SANE_String_Const modeList[] = {
+  colorStr,
+  grayStr,
+  lineartStr,
+  NULL
+};
+
+static int
+_bytesPerLineLineart (int pixelsPerLine)
+{
+  return (pixelsPerLine * BITS_PER_PIXEL_LINEART +
+          BITS_PADDING) / BITS_PER_BYTE;
+}
+
+static int
+_bytesPerLineGray (int pixelsPerLine)
+{
+  return (pixelsPerLine * BITS_PER_PIXEL_GRAY + BITS_PADDING) / BITS_PER_BYTE;
+}
+
+static int
+_bytesPerLineColor (int pixelsPerLine)
+{
+  return (pixelsPerLine * BITS_PER_PIXEL_COLOR +
+          BITS_PADDING) / BITS_PER_BYTE;
+}
+
+
+/* dummy*/
+static void
+_rgb2rgb (unsigned char *buffer, int pixels, int threshold)
+{
+  /* make the compiler content */
+  buffer = buffer;
+  pixels = pixels;
+  threshold = threshold;
+}
+
+
+/* convert 24bit RGB to 8bit GRAY */
+static void
+_rgb2gray (unsigned char *buffer, int pixels, int threshold)
+{
+#define WEIGHT_R 27
+#define WEIGHT_G 54
+#define WEIGHT_B 19
+#define WEIGHT_W (WEIGHT_R + WEIGHT_G + WEIGHT_B)
+  static int aWeight[BYTES_PER_PIXEL_COLOR] =
+    { WEIGHT_R, WEIGHT_G, WEIGHT_B };
+  int nbyte = pixels * BYTES_PER_PIXEL_COLOR;
+  int acc = 0;
+  int x;
+
+  /* make the compiler content */
+  threshold = threshold;
+
+  for (x = 0; x < nbyte; ++x)
+    {
+      acc += aWeight[x % BYTES_PER_PIXEL_COLOR] * buffer[x];
+      if ((x + 1) % BYTES_PER_PIXEL_COLOR == 0)
+        {
+          buffer[x / BYTES_PER_PIXEL_COLOR] =
+            (unsigned char) (acc / WEIGHT_W);
+          acc = 0;
+        }
+    }
+#undef WEIGHT_R
+#undef WEIGHT_G
+#undef WEIGHT_B
+#undef WEIGHT_W
+}
+
+/* convert 24bit RGB to 1bit B/W */
+static void
+_rgb2lineart (unsigned char *buffer, int pixels, int threshold)
+{
+  static const int aMask[BITS_PER_BYTE] = { 128, 64, 32, 16, 8, 4, 2, 1 };
+  int acc = 0;
+  int nx;
+  int x;
+  int thresh;
+  _rgb2gray (buffer, pixels, 0);
+  nx = ((pixels + BITS_PADDING) / BITS_PER_BYTE) * BITS_PER_BYTE;
+  thresh = 255 * threshold / rangeThreshold.max;
+  for (x = 0; x < nx; ++x)
+    {
+      if (x < pixels && buffer[x] < thresh)
+        {
+          acc |= aMask[x % BITS_PER_BYTE];
+        }
+      if ((x + 1) % BITS_PER_BYTE == 0)
+        {
+          buffer[x / BITS_PER_BYTE] = (unsigned char) (acc);
+          acc = 0;
+        }
+    }
+}
+
+typedef struct tgModeParam
+{
+  SANE_Int depth;
+  SANE_Frame format;
+  int (*bytesPerLine) (int pixelsPerLine);
+  void (*adaptFormat) (unsigned char *rgbBuffer, int pixels, int threshold);
+
+} TModeParam;
+
+static const TModeParam modeParam[] = {
+  {DEPTH_COLOR, SANE_FRAME_RGB, _bytesPerLineColor, _rgb2rgb},
+  {DEPTH_GRAY, SANE_FRAME_GRAY, _bytesPerLineGray, _rgb2gray},
+  {DEPTH_LINEART, SANE_FRAME_GRAY, _bytesPerLineLineart, _rgb2lineart}
+};
+
+
+#define WARMUP_AFTERSTART    1  /* flag for 1st warm up */
+#define WARMUP_INSESSION     0
+#define WARMUP_TESTINTERVAL 15  /* test every 15sec */
+#define WARMUP_TIME         30  /* first wait is 30sec minimum */
+#define WARMUP_MAXTIME      90  /* after one and a half minute start latest */
+
+#define CAL_DEV_MAX         15
+/* maximum deviation of cal values in percent between 2 tests */
+
+/* different warm up after start and after automatic off */
+static const int aiWarmUpTime[] = { WARMUP_TESTINTERVAL, WARMUP_TIME };
+
+
+
+/* returns 1, when the warm up time "iTime" has elasped */
+static int
+_TimeElapsed (struct timeval *start, struct timeval *now, int iTime)
+{
+
+  /* this is a bit strange, but can deal with overflows */
+  if (start->tv_sec > now->tv_sec)
+    return (start->tv_sec / 2 - now->tv_sec / 2 > iTime / 2);
+  else
+    return (now->tv_sec - start->tv_sec >= iTime);
+}
+
+static void
+_WarmUpLamp (TScanner * s, int iMode)
+{
+  SANE_Bool fLampOn;
+  /* on startup don't care what was before
+     assume lamp was off, and the previous
+     cal values can never be reached */
+  if (iMode == WARMUP_AFTERSTART)
+    {
+      fLampOn = SANE_FALSE;
+      s->CalWhite[0] = s->CalWhite[1] = s->CalWhite[2] = (unsigned char) (-1);
+    }
+  else
+    GetLamp (&s->HWParams, &fLampOn);
+
+  if (!fLampOn)
+    {
+      /* get the current system time */
+      gettimeofday (&s->WarmUpStarted, 0);
+      /* determine the time to wait at least */
+      s->WarmUpTime = aiWarmUpTime[iMode];
+      /* switch on the lamp */
+      SetLamp (&s->HWParams, SANE_TRUE);
+    }
+}
+
+static void
+_WaitForLamp (TScanner * s, unsigned char *pabCalibTable)
+{
+  struct timeval now[2];        /* toggling time holder */
+  int i;                        /* rgb loop */
+  int iCal = 0;                 /* counter */
+  int iCurrent = 0;             /* buffer and time-holder swap flag */
+  SANE_Bool fHasCal;
+  unsigned char CalWhite[2][3]; /* toggling buffer */
+  int iDelay = 0;               /* delay loop counter */
+  _WarmUpLamp (s, SANE_FALSE);
+
+
+  /* get the time stamp for the wait loops */
+  if (s->WarmUpTime)
+    gettimeofday (&now[iCurrent], 0);
+  SimpleCalibExt (&s->HWParams, pabCalibTable, CalWhite[iCurrent]);
+  fHasCal = SANE_TRUE;
+
+  DBG (DBG_MSG, "_WaitForLamp: first calibration\n");
+
+
+  /* wait until time has elapsed or for values to stabilze */
+  while (s->WarmUpTime)
+    {
+      /* check if the last scan has lower calibration values than
+         the current one would have */
+      if (s->WarmUpTime && fHasCal)
+        {
+          SANE_Bool fOver = SANE_TRUE;
+          for (i = 0; fOver && i < 3; ++i)
+            {
+              if (!s->CalWhite[i])
+                fOver = SANE_FALSE;
+              else if (CalWhite[iCurrent][i] < s->CalWhite[i])
+                fOver = SANE_FALSE;
+            }
+
+          /* warm up is not needed, when calibration data is above
+             the calibration data of the last scan */
+          if (fOver)
+            {
+              s->WarmUpTime = 0;
+              DBG (DBG_MSG,
+                   "_WaitForLamp: Values seem stable, skipping next calibration cycle\n");
+            }
+        }
+
+
+      /* break the loop, when the longest wait time has expired
+         to prevent a hanging application,
+         even if the values might not be good, yet */
+      if (s->WarmUpTime && fHasCal && iCal)
+        {
+          /* abort, when we have waited long enough */
+          if (_TimeElapsed
+              (&s->WarmUpStarted, &now[iCurrent], WARMUP_MAXTIME))
+            {
+              /* stop idling */
+              s->WarmUpTime = 0;
+              DBG (DBG_MSG, "_WaitForLamp: WARMUP_MAXTIME=%ds elapsed!\n",
+                   WARMUP_MAXTIME);
+            }
+        }
+
+
+      /* enter a delay loop, when there is still time to wait */
+      if (s->WarmUpTime)
+        {
+          /* if the (too low) calibration values have just been acquired
+             we start waiting */
+          if (fHasCal)
+            DBG (DBG_MSG, "_WaitForLamp: entering delay loop\r");
+          else
+            DBG (DBG_MSG, "_WaitForLamp: delay loop %d        \r", ++iDelay);
+          sleep (1);
+          fHasCal = SANE_FALSE;
+          gettimeofday (&now[!iCurrent], 0);
+        }
+
+
+      /* look if we should check again */
+      if (s->WarmUpTime         /* did we have to wait at all */
+          /* is the minimum time elapsed */
+          && _TimeElapsed (&s->WarmUpStarted, &now[!iCurrent], s->WarmUpTime)
+          /* has the minimum time elapsed since the last calibration */
+          && _TimeElapsed (&now[iCurrent], &now[!iCurrent],
+                           WARMUP_TESTINTERVAL))
+        {
+          int dev = 0;          /* 0 percent deviation in cal value as default */
+          iDelay = 0;           /* all delays processed */
+          /* new calibration */
+          ++iCal;
+          iCurrent = !iCurrent; /* swap the test-buffer, and time-holder */
+          SimpleCalibExt (&s->HWParams, pabCalibTable, CalWhite[iCurrent]);
+          fHasCal = SANE_TRUE;
+
+          for (i = 0; i < 3; ++i)
+            {
+              /* copy for faster and clearer access */
+              int cwa;
+              int cwb;
+              int ldev;
+              cwa = CalWhite[!iCurrent][i];
+              cwb = CalWhite[iCurrent][i];
+              /* find the biggest deviation of one color */
+              if (cwa > cwb)
+                ldev = 0;
+              else if (cwa && cwb)
+                ldev = ((cwb - cwa) * 100) / cwb;
+              else
+                ldev = 100;
+              dev = MAX (dev, ldev);
+            }
+
+          /* show the biggest deviation of the calibration values */
+          DBG (DBG_MSG, "_WaitForLamp: recalibration #%d, deviation = %d%%\n",
+               iCal, dev);
+
+          /* the deviation to the previous calibration is tolerable */
+          if (dev <= CAL_DEV_MAX)
+            s->WarmUpTime = 0;
+        }
+    }
+
+  /* remember the values of this calibration
+     for the next time */
+  for (i = 0; i < 3; ++i)
+    {
+      s->CalWhite[i] = CalWhite[iCurrent][i];
+    }
+}
+
+
+/* used, when setting gamma as 1 value */
+static void
+_SetScalarGamma (SANE_Int * aiGamma, SANE_Int sfGamma)
+{
+  int j;
+  double fGamma;
+  fGamma = SANE_UNFIX (sfGamma);
+  for (j = 0; j < SANE_GAMMA_SIZE; j++)
+    {
+      int iData;
+      iData =
+        floor (256.0 *
+               pow (((double) j / (double) SANE_GAMMA_SIZE), 1.0 / fGamma));
+      if (iData > 255)
+        iData = 255;
+      aiGamma[j] = iData;
+    }
+}
+
+
+/* return size of longest string in a string list */
+static size_t
+_MaxStringSize (const 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;
+}
+
+
+/* change a sane cap and return true, when a change took place */
+static int
+_ChangeCap (SANE_Word * pCap, SANE_Word cap, int isSet)
+{
+  SANE_Word prevCap = *pCap;
+  if (isSet)
+    {
+      *pCap |= cap;
+    }
+  else
+    {
+      *pCap &= ~cap;
+    }
+  return *pCap != prevCap;
+}
+
+
+static void
+_InitOptions (TScanner * s)
+{
+  int i;
+  SANE_Option_Descriptor *pDesc;
+  TOptionValue *pVal;
+  _SetScalarGamma (s->aGammaTable, startUpGamma);
+
+  for (i = optCount; i < optLast; i++)
+    {
+
+      pDesc = &s->aOptions[i];
+      pVal = &s->aValues[i];
+
+      /* defaults */
+      pDesc->name = "";
+      pDesc->title = "";
+      pDesc->desc = "";
+      pDesc->type = SANE_TYPE_INT;
+      pDesc->unit = SANE_UNIT_NONE;
+      pDesc->size = sizeof (SANE_Word);
+      pDesc->constraint_type = SANE_CONSTRAINT_NONE;
+      pDesc->cap = 0;
+
+      switch (i)
+        {
+
+        case optCount:
+          pDesc->title = SANE_TITLE_NUM_OPTIONS;
+          pDesc->desc = SANE_DESC_NUM_OPTIONS;
+          pDesc->cap = SANE_CAP_SOFT_DETECT;
+          pVal->w = (SANE_Word) optLast;
+          break;
+
+        case optGroupGeometry:
+          pDesc->title = "Geometry";
+          pDesc->type = SANE_TYPE_GROUP;
+          pDesc->size = 0;
+          break;
+
+        case optTLX:
+          pDesc->name = SANE_NAME_SCAN_TL_X;
+          pDesc->title = SANE_TITLE_SCAN_TL_X;
+          pDesc->desc = SANE_DESC_SCAN_TL_X;
+          pDesc->unit = SANE_UNIT_MM;
+          pDesc->constraint_type = SANE_CONSTRAINT_RANGE;
+          pDesc->constraint.range = &rangeXmm;
+          pDesc->cap = SANE_CAP_SOFT_SELECT | SANE_CAP_SOFT_DETECT;
+          pVal->w = rangeXmm.min;
+          break;
+
+        case optTLY:
+          pDesc->name = SANE_NAME_SCAN_TL_Y;
+          pDesc->title = SANE_TITLE_SCAN_TL_Y;
+          pDesc->desc = SANE_DESC_SCAN_TL_Y;
+          pDesc->unit = SANE_UNIT_MM;
+          pDesc->constraint_type = SANE_CONSTRAINT_RANGE;
+          pDesc->constraint.range = &rangeYmm;
+          pDesc->cap = SANE_CAP_SOFT_SELECT | SANE_CAP_SOFT_DETECT;
+          pVal->w = rangeYmm.min;
+          break;
+
+        case optBRX:
+          pDesc->name = SANE_NAME_SCAN_BR_X;
+          pDesc->title = SANE_TITLE_SCAN_BR_X;
+          pDesc->desc = SANE_DESC_SCAN_BR_X;
+          pDesc->unit = SANE_UNIT_MM;
+          pDesc->constraint_type = SANE_CONSTRAINT_RANGE;
+          pDesc->constraint.range = &rangeXmm;
+          pDesc->cap = SANE_CAP_SOFT_SELECT | SANE_CAP_SOFT_DETECT;
+          pVal->w = 210 /* A4 width instead of rangeXmm.max */ ;
+          break;
+
+        case optBRY:
+          pDesc->name = SANE_NAME_SCAN_BR_Y;
+          pDesc->title = SANE_TITLE_SCAN_BR_Y;
+          pDesc->desc = SANE_DESC_SCAN_BR_Y;
+          pDesc->unit = SANE_UNIT_MM;
+          pDesc->constraint_type = SANE_CONSTRAINT_RANGE;
+          pDesc->constraint.range = &rangeYmm;
+          pDesc->cap = SANE_CAP_SOFT_SELECT | SANE_CAP_SOFT_DETECT;
+          pVal->w = 290 /* have a bit reserve instaed of rangeYmm.max */ ;
+          break;
+
+        case optDPI:
+          pDesc->name = SANE_NAME_SCAN_RESOLUTION;
+          pDesc->title = SANE_TITLE_SCAN_RESOLUTION;
+          pDesc->desc = SANE_DESC_SCAN_RESOLUTION;
+          pDesc->unit = SANE_UNIT_DPI;
+          pDesc->constraint_type = SANE_CONSTRAINT_WORD_LIST;
+          pDesc->constraint.word_list = setResolutions;
+          pDesc->cap = SANE_CAP_SOFT_SELECT | SANE_CAP_SOFT_DETECT;
+          pVal->w = setResolutions[2];  /* default to 150dpi */
+          break;
+
+        case optGroupImage:
+          pDesc->title = SANE_I18N ("Image");
+          pDesc->type = SANE_TYPE_GROUP;
+          pDesc->size = 0;
+          break;
+
+        case optGamma:
+          pDesc->name = SANE_NAME_ANALOG_GAMMA;
+          pDesc->title = SANE_TITLE_ANALOG_GAMMA;
+          pDesc->desc = SANE_DESC_ANALOG_GAMMA;
+          pDesc->type = SANE_TYPE_FIXED;
+          pDesc->constraint_type = SANE_CONSTRAINT_RANGE;
+          pDesc->constraint.range = &rangeGamma;
+          pDesc->cap = SANE_CAP_SOFT_SELECT | SANE_CAP_SOFT_DETECT;
+          pVal->w = startUpGamma;
+          break;
+
+        case optGammaTable:
+          pDesc->name = SANE_NAME_GAMMA_VECTOR;
+          pDesc->title = SANE_TITLE_GAMMA_VECTOR;
+          pDesc->desc = SANE_DESC_GAMMA_VECTOR;
+          pDesc->size = sizeof (s->aGammaTable);
+          pDesc->constraint_type = SANE_CONSTRAINT_RANGE;
+          pDesc->constraint.range = &rangeGammaTable;
+          pDesc->cap = SANE_CAP_SOFT_SELECT | SANE_CAP_SOFT_DETECT;
+          pVal->wa = s->aGammaTable;
+          break;
+
+        case optGroupMisc:
+          pDesc->title = SANE_I18N ("Miscellaneous");
+          pDesc->type = SANE_TYPE_GROUP;
+          pDesc->size = 0;
+          break;
+
+        case optLamp:
+          pDesc->name = "lamp";
+          pDesc->title = SANE_I18N ("Lamp status");
+          pDesc->desc = SANE_I18N ("Switches the lamp on or off.");
+          pDesc->type = SANE_TYPE_BOOL;
+          pDesc->cap = SANE_CAP_SOFT_SELECT | SANE_CAP_SOFT_DETECT;
+          /* switch the lamp on when starting for first the time */
+          pVal->w = SANE_TRUE;
+          break;
+
+        case optCalibrate:
+          pDesc->name = "calibrate";
+          pDesc->title = SANE_I18N ("Calibrate");
+          pDesc->desc = SANE_I18N ("Calibrates for black and white level.");
+          pDesc->type = SANE_TYPE_BUTTON;
+          pDesc->cap = SANE_CAP_SOFT_SELECT;
+          pDesc->size = 0;
+          break;
+
+        case optGroupMode:
+          pDesc->title = SANE_I18N ("Scan Mode");
+          pDesc->desc = "";
+          pDesc->type = SANE_TYPE_GROUP;
+          break;
+
+        case optMode:
+          /* scan mode */
+          pDesc->name = SANE_NAME_SCAN_MODE;
+          pDesc->title = SANE_TITLE_SCAN_MODE;
+          pDesc->desc = SANE_DESC_SCAN_MODE;
+          pDesc->type = SANE_TYPE_STRING;
+          pDesc->size = _MaxStringSize (modeList);
+          pDesc->constraint_type = SANE_CONSTRAINT_STRING_LIST;
+          pDesc->constraint.string_list = modeList;
+          pDesc->cap =
+            SANE_CAP_SOFT_SELECT | SANE_CAP_SOFT_DETECT | SANE_CAP_EMULATED;
+          pVal->w = MODE_COLOR;
+          break;
+
+        case optGroupEnhancement:
+          pDesc->title = SANE_I18N ("Enhancement");
+          pDesc->desc = "";
+          pDesc->type = SANE_TYPE_GROUP;
+          break;
+
+        case optThreshold:
+          pDesc->name = SANE_NAME_THRESHOLD;
+          pDesc->title = SANE_TITLE_THRESHOLD;
+          pDesc->desc = SANE_DESC_THRESHOLD;
+          pDesc->type = SANE_TYPE_INT;
+          pDesc->unit = SANE_UNIT_PERCENT;
+          pDesc->constraint_type = SANE_CONSTRAINT_RANGE;
+          pDesc->constraint.range = &rangeThreshold;
+          pDesc->cap =
+            SANE_CAP_SOFT_SELECT | SANE_CAP_SOFT_DETECT | SANE_CAP_INACTIVE |
+            SANE_CAP_EMULATED;
+          pVal->w = 50;
+
+        default:
+          DBG (DBG_ERR, "Uninitialised option %d\n", i);
+          break;
+        }
+    }
+}
+
+
+static int
+_ReportDevice (TScannerModel * pModel, const char *pszDeviceName)
+{
+  TDevListEntry *pNew, *pDev;
+
+  DBG (DBG_MSG, "niash: _ReportDevice '%s'\n", pszDeviceName);
+
+  pNew = malloc (sizeof (TDevListEntry));
+  if (!pNew)
+    {
+      DBG (DBG_ERR, "no mem\n");
+      return -1;
+    }
+
+  /* add new element to the end of the list */
+  if (_pFirstSaneDev == 0)
+    {
+      _pFirstSaneDev = pNew;
+    }
+  else
+    {
+      for (pDev = _pFirstSaneDev; pDev->pNext; pDev = pDev->pNext)
+        {
+          ;
+        }
+      pDev->pNext = pNew;
+    }
+
+  /* fill in new element */
+  pNew->pNext = 0;
+  pNew->dev.name = strdup (pszDeviceName);
+  pNew->dev.vendor = pModel->pszVendor;
+  pNew->dev.model = pModel->pszName;
+  pNew->dev.type = "flatbed scanner";
+
+  iNumSaneDev++;
+
+  return 0;
+}
+
+
+
+/*****************************************************************************/
+
+SANE_Status
+sane_init (SANE_Int * piVersion, SANE_Auth_Callback pfnAuth)
+{
+  /* prevent compiler from complaing about unused parameters */
+  pfnAuth = pfnAuth;
+
+  DBG_INIT ();
+  DBG (DBG_MSG, "sane_init\n");
+
+  if (piVersion != NULL)
+    {
+      *piVersion = SANE_VERSION_CODE (SANE_CURRENT_MAJOR, V_MINOR, BUILD);
+    }
+
+  /* initialise transfer methods */
+  iNumSaneDev = 0;
+  NiashXferInit (_ReportDevice);
+
+  return SANE_STATUS_GOOD;
+}
+
+
+void
+sane_exit (void)
+{
+  TDevListEntry *pDev, *pNext;
+
+  DBG (DBG_MSG, "sane_exit\n");
+
+  /* free device list memory */
+  if (_pSaneDevList)
+    {
+      for (pDev = _pFirstSaneDev; pDev; pDev = pNext)
+        {
+          pNext = pDev->pNext;
+          free ((void *) pDev->dev.name);
+          free (pDev);
+        }
+      _pFirstSaneDev = 0;
+      free (_pSaneDevList);
+      _pSaneDevList = 0;
+    }
+}
+
+
+SANE_Status
+sane_get_devices (const SANE_Device *** device_list, SANE_Bool local_only)
+{
+  TDevListEntry *pDev;
+  int i;
+
+  DBG (DBG_MSG, "sane_get_devices\n");
+
+  local_only = local_only;
+
+  if (_pSaneDevList)
+    {
+      free (_pSaneDevList);
+    }
+
+  _pSaneDevList = malloc (sizeof (*_pSaneDevList) * (iNumSaneDev + 1));
+  if (!_pSaneDevList)
+    {
+      DBG (DBG_MSG, "no mem\n");
+      return SANE_STATUS_NO_MEM;
+    }
+  i = 0;
+  for (pDev = _pFirstSaneDev; pDev; pDev = pDev->pNext)
+    {
+      _pSaneDevList[i++] = &pDev->dev;
+    }
+  _pSaneDevList[i++] = 0;       /* last entry is 0 */
+
+  *device_list = _pSaneDevList;
+
+  return SANE_STATUS_GOOD;
+}
+
+
+SANE_Status
+sane_open (SANE_String_Const name, SANE_Handle * h)
+{
+  TScanner *s;
+
+  DBG (DBG_MSG, "sane_open: %s\n", name);
+
+  /* check the name */
+  if (strlen (name) == 0)
+    {
+      /* default to first available device */
+      name = _pFirstSaneDev->dev.name;
+    }
+
+  s = malloc (sizeof (TScanner));
+  if (!s)
+    {
+      DBG (DBG_MSG, "malloc failed\n");
+      return SANE_STATUS_NO_MEM;
+    }
+
+  if (NiashOpen (&s->HWParams, name) < 0)
+    {
+      /* is this OK ? */
+      DBG (DBG_ERR, "NiashOpen failed\n");
+      free ((void *) s);
+      return SANE_STATUS_DEVICE_BUSY;
+    }
+  _InitOptions (s);
+  s->fScanning = SANE_FALSE;
+  s->fCancelled = SANE_FALSE;
+  *h = s;
+
+  /* Turn on lamp by default at startup */
+  _WarmUpLamp (s, WARMUP_AFTERSTART);
+
+  return SANE_STATUS_GOOD;
+}
+
+
+void
+sane_close (SANE_Handle h)
+{
+  TScanner *s;
+
+  DBG (DBG_MSG, "sane_close\n");
+
+  s = (TScanner *) h;
+
+  /* turn off scanner lamp */
+  SetLamp (&s->HWParams, SANE_FALSE);
+
+  /* close scanner */
+  NiashClose (&s->HWParams);
+
+  /* free scanner object memory */
+  free ((void *) s);
+}
+
+
+const SANE_Option_Descriptor *
+sane_get_option_descriptor (SANE_Handle h, SANE_Int n)
+{
+  TScanner *s;
+
+  DBG (DBG_MSG, "sane_get_option_descriptor %d\n", n);
+
+  if ((n < optCount) || (n >= optLast))
+    {
+      return NULL;
+    }
+
+  s = (TScanner *) h;
+  return &s->aOptions[n];
+}
+
+
+SANE_Status
+sane_control_option (SANE_Handle h, SANE_Int n, SANE_Action Action,
+                     void *pVal, SANE_Int * pInfo)
+{
+  TScanner *s;
+  SANE_Bool fVal;
+  static char szTable[100];
+  int *pi;
+  int i;
+  SANE_Int info;
+  SANE_Bool fLampIsOn;
+  SANE_Status status;
+  SANE_Bool fSame;
+
+  DBG (DBG_MSG, "sane_control_option: option %d, action %d\n", n, Action);
+
+  s = (TScanner *) h;
+  info = 0;
+
+  switch (Action)
+    {
+    case SANE_ACTION_GET_VALUE:
+      switch (n)
+        {
+
+          /* Get options of type SANE_Word */
+        case optCount:
+        case optDPI:
+        case optGamma:
+        case optTLX:
+        case optTLY:
+        case optBRX:
+        case optBRY:
+        case optThreshold:
+          DBG (DBG_MSG,
+               "sane_control_option: SANE_ACTION_GET_VALUE %d = %d\n", n,
+               (int) s->aValues[n].w);
+          *(SANE_Word *) pVal = s->aValues[n].w;
+          break;
+
+          /* Get options of type SANE_Word array */
+        case optGammaTable:
+          DBG (DBG_MSG, "Reading gamma table\n");
+          memcpy (pVal, s->aValues[n].wa, s->aOptions[n].size);
+          break;
+
+        case optMode:
+          DBG (DBG_MSG, "Reading scan mode %s\n",
+               modeList[s->aValues[optMode].w]);
+          strcpy ((char *) pVal, modeList[s->aValues[optMode].w]);
+          break;
+
+          /* Get options of type SANE_Bool */
+        case optLamp:
+          GetLamp (&s->HWParams, &fLampIsOn);
+          *(SANE_Bool *) pVal = fLampIsOn;
+          break;
+
+        case optCalibrate:
+          /*  although this option has nothing to read,
+             it's added here to avoid a warning when running scanimage --help */
+          break;
+
+        default:
+          DBG (DBG_MSG, "SANE_ACTION_GET_VALUE: Invalid option (%d)\n", n);
+        }
+      break;
+
+
+    case SANE_ACTION_SET_VALUE:
+      if (s->fScanning)
+        {
+          DBG (DBG_ERR,
+               "sane_control_option: SANE_ACTION_SET_VALUE not allowed during scan\n");
+          return SANE_STATUS_INVAL;
+        }
+      switch (n)
+        {
+
+        case optCount:
+          return SANE_STATUS_INVAL;
+
+        case optGamma:
+        case optThreshold:
+        case optDPI:
+
+          info |= SANE_INFO_RELOAD_PARAMS;
+          /* fall through */
+
+        case optTLX:
+        case optTLY:
+        case optBRX:
+        case optBRY:
+
+          status = sanei_constrain_value (&s->aOptions[n], pVal, &info);
+          if (status != SANE_STATUS_GOOD)
+            {
+              DBG (DBG_ERR, "Failed to constrain option %d (%s)\n", n,
+                   s->aOptions[n].title);
+              return status;
+            }
+
+          /* check values if they are equal */
+          fSame = s->aValues[n].w == *(SANE_Word *) pVal;
+
+          /* set the values */
+          s->aValues[n].w = *(SANE_Word *) pVal;
+          DBG (DBG_MSG,
+               "sane_control_option: SANE_ACTION_SET_VALUE %d = %d\n", n,
+               (int) s->aValues[n].w);
+          if (n == optGamma)
+            {
+              if (!fSame && optLast > optGammaTable)
+                {
+                  info |= SANE_INFO_RELOAD_OPTIONS;
+                }
+              _SetScalarGamma (s->aGammaTable, s->aValues[n].w);
+            }
+          break;
+
+        case optGammaTable:
+          DBG (DBG_MSG, "Writing gamma table\n");
+          pi = (SANE_Int *) pVal;
+          memcpy (s->aValues[n].wa, pVal, s->aOptions[n].size);
+
+          /* prepare table for debug */
+          strcpy (szTable, "Gamma table summary:");
+          for (i = 0; i < SANE_GAMMA_SIZE; i++)
+            {
+              if ((SANE_GAMMA_SIZE / 16) && (i % (SANE_GAMMA_SIZE / 16)) == 0)
+                {
+                  DBG (DBG_MSG, "%s\n", szTable);
+		  szTable[0] = '\0';
+                }
+              /* test for number print */
+              if ((SANE_GAMMA_SIZE / 64) && (i % (SANE_GAMMA_SIZE / 64)) == 0)
+                {
+                  sprintf (szTable + strlen(szTable), " %04X", pi[i]);
+                }
+            }
+          if (strlen (szTable))
+            {
+              DBG (DBG_MSG, "%s\n", szTable);
+            }
+          break;
+
+        case optMode:
+          {
+            SANE_Word *pCap;
+            int fCapChanged = 0;
+
+            pCap = &s->aOptions[optThreshold].cap;
+
+            if (strcmp ((char const *) pVal, colorStr) == 0)
+              {
+                s->aValues[optMode].w = MODE_COLOR;
+                fCapChanged = _ChangeCap (pCap, SANE_CAP_INACTIVE, 1);
+              }
+            if (strcmp ((char const *) pVal, grayStr) == 0)
+              {
+                s->aValues[optMode].w = MODE_GRAY;
+                fCapChanged = _ChangeCap (pCap, SANE_CAP_INACTIVE, 1);
+              }
+            if (strcmp ((char const *) pVal, lineartStr) == 0)
+              {
+                s->aValues[optMode].w = MODE_LINEART;
+                fCapChanged = _ChangeCap (pCap, SANE_CAP_INACTIVE, 0);
+
+              }
+            info |= SANE_INFO_RELOAD_PARAMS;
+            if (fCapChanged)
+              {
+                info |= SANE_INFO_RELOAD_OPTIONS;
+              }
+            DBG (DBG_MSG, "setting scan mode: %s\n", (char const *) pVal);
+          }
+          break;
+
+
+
+        case optLamp:
+          fVal = *(SANE_Bool *) pVal;
+          DBG (DBG_MSG, "lamp %s\n", fVal ? "on" : "off");
+          if (fVal)
+            _WarmUpLamp (s, WARMUP_INSESSION);
+          else
+            SetLamp (&s->HWParams, SANE_FALSE);
+          break;
+
+        case optCalibrate:
+/*       SimpleCalib(&s->HWParams); */
+          break;
+
+        default:
+          DBG (DBG_ERR, "SANE_ACTION_SET_VALUE: Invalid option (%d)\n", n);
+        }
+      if (pInfo != NULL)
+        {
+          *pInfo |= info;
+        }
+      break;
+
+
+    case SANE_ACTION_SET_AUTO:
+      return SANE_STATUS_UNSUPPORTED;
+
+
+    default:
+      DBG (DBG_ERR, "Invalid action (%d)\n", Action);
+      return SANE_STATUS_INVAL;
+    }
+
+  return SANE_STATUS_GOOD;
+}
+
+
+
+
+
+SANE_Status
+sane_get_parameters (SANE_Handle h, SANE_Parameters * p)
+{
+  TScanner *s;
+  TModeParam const *pMode;
+
+  DBG (DBG_MSG, "sane_get_parameters\n");
+
+  s = (TScanner *) h;
+
+  /* first do some checks */
+  if (s->aValues[optTLX].w >= s->aValues[optBRX].w)
+    {
+      DBG (DBG_ERR, "TLX should be smaller than BRX\n");
+      return SANE_STATUS_INVAL; /* proper error code? */
+    }
+  if (s->aValues[optTLY].w >= s->aValues[optBRY].w)
+    {
+      DBG (DBG_ERR, "TLY should be smaller than BRY\n");
+      return SANE_STATUS_INVAL; /* proper error code? */
+    }
+
+
+  pMode = &modeParam[s->aValues[optMode].w];
+
+  /* return the data */
+  p->format = pMode->format;
+  p->last_frame = SANE_TRUE;
+
+  p->lines = MM_TO_PIXEL (s->aValues[optBRY].w - s->aValues[optTLY].w,
+                          s->aValues[optDPI].w);
+  p->depth = pMode->depth;
+  p->pixels_per_line =
+    MM_TO_PIXEL (s->aValues[optBRX].w - s->aValues[optTLX].w,
+                 s->aValues[optDPI].w);
+  p->bytes_per_line = pMode->bytesPerLine (p->pixels_per_line);
+
+  return SANE_STATUS_GOOD;
+}
+
+
+/* get the scale down factor for a resolution that is
+  not supported by hardware */
+static int
+_SaneEmulateScaling (int iDpi)
+{
+  if (iDpi == 75)
+    return 2;
+  else
+    return 1;
+}
+
+
+SANE_Status
+sane_start (SANE_Handle h)
+{
+  TScanner *s;
+  SANE_Parameters par;
+  int iLineCorr;
+  int iScaleDown;
+  static unsigned char abGamma[HW_GAMMA_SIZE];
+  static unsigned char abCalibTable[HW_PIXELS * 6];
+
+  DBG (DBG_MSG, "sane_start\n");
+
+  s = (TScanner *) h;
+
+  if (sane_get_parameters (h, &par) != SANE_STATUS_GOOD)
+    {
+      DBG (DBG_MSG, "Invalid scan parameters\n");
+      return SANE_STATUS_INVAL;
+    }
+  iScaleDown = _SaneEmulateScaling (s->aValues[optDPI].w);
+  s->iLinesLeft = par.lines;
+
+  /* fill in the scanparams using the option values */
+  s->ScanParams.iDpi = s->aValues[optDPI].w * iScaleDown;
+  s->ScanParams.iLpi = s->aValues[optDPI].w * iScaleDown;
+
+  /* calculate correction for filling of circular buffer */
+  iLineCorr = 3 * s->HWParams.iSensorSkew;      /* usually 16 motor steps */
+  /* calculate correction for garbage lines */
+  iLineCorr += s->HWParams.iSkipLines * (HW_LPI / s->ScanParams.iLpi);
+
+  s->ScanParams.iTop =
+    MM_TO_PIXEL (s->aValues[optTLY].w + s->HWParams.iTopLeftY,
+                 HW_LPI) - iLineCorr;
+  s->ScanParams.iLeft =
+    MM_TO_PIXEL (s->aValues[optTLX].w + s->HWParams.iTopLeftX, HW_DPI);
+
+  s->ScanParams.iWidth = par.pixels_per_line * iScaleDown;
+  s->ScanParams.iHeight = par.lines * iScaleDown;
+  s->ScanParams.iBottom = HP3300C_BOTTOM;
+  s->ScanParams.fCalib = SANE_FALSE;
+
+  /* perform a simple calibration just before scanning */
+  _WaitForLamp (s, abCalibTable);
+
+  if (s->aValues[optMode].w == MODE_LINEART)
+    {
+      /* use a unity gamma table for lineart to be independent from Gamma settings */
+      _UnityGammaTable (abGamma);
+    }
+  else
+    {
+      /* copy gamma table */
+      _ConvertGammaTable (s->aGammaTable, abGamma);
+    }
+
+  WriteGammaCalibTable (abGamma, abGamma, abGamma, abCalibTable, 0, 0,
+                        &s->HWParams);
+
+  /* prepare the actual scan */
+  if (!InitScan (&s->ScanParams, &s->HWParams))
+    {
+      DBG (DBG_MSG, "Invalid scan parameters\n");
+      return SANE_STATUS_INVAL;
+    }
+
+  /* init data pipe */
+  s->DataPipe.iSkipLines = s->HWParams.iSkipLines;
+  /* on the hp3400 and hp4300 we cannot set the top of the scan area (yet),
+     so instead we just scan and throw away the data until the top */
+  if (s->HWParams.fReg07)
+    {
+      s->DataPipe.iSkipLines +=
+        MM_TO_PIXEL (s->aValues[optTLY].w + s->HWParams.iTopLeftY,
+                     s->aValues[optDPI].w * iScaleDown);
+    }
+  s->iBytesLeft = 0;
+  s->iPixelsPerLine = par.pixels_per_line;
+
+  /* hack */
+  s->DataPipe.pabLineBuf = (unsigned char *) malloc (HW_PIXELS * 3);
+  CircBufferInit (s->HWParams.iXferHandle, &s->DataPipe,
+                  par.pixels_per_line, s->ScanParams.iHeight,
+                  s->ScanParams.iLpi * s->HWParams.iSensorSkew / HW_LPI,
+                  s->HWParams.iReversedHead, iScaleDown, iScaleDown);
+
+  s->fScanning = SANE_TRUE;
+  s->fCancelled = SANE_FALSE;
+  return SANE_STATUS_GOOD;
+}
+
+
+SANE_Status
+sane_read (SANE_Handle h, SANE_Byte * buf, SANE_Int maxlen, SANE_Int * len)
+{
+  TScanner *s;
+  TDataPipe *p;
+  TModeParam const *pMode;
+
+  DBG (DBG_MSG, "sane_read: buf=%p, maxlen=%d, ", buf, maxlen);
+
+  s = (TScanner *) h;
+
+  pMode = &modeParam[s->aValues[optMode].w];
+
+  /* sane_read only allowed after sane_start */
+  if (!s->fScanning)
+    {
+      if (s->fCancelled)
+        {
+          DBG (DBG_MSG, "\n");
+          DBG (DBG_MSG, "sane_read: sane_read cancelled\n");
+          s->fCancelled = SANE_FALSE;
+          return SANE_STATUS_CANCELLED;
+        }
+      else
+        {
+          DBG (DBG_ERR,
+               "sane_read: sane_read only allowed after sane_start\n");
+          return SANE_STATUS_INVAL;
+        }
+    }
+
+  p = &s->DataPipe;
+
+  /* anything left to read? */
+  if ((s->iLinesLeft == 0) && (s->iBytesLeft == 0))
+    {
+      CircBufferExit (p);
+      free (p->pabLineBuf);
+      p->pabLineBuf = NULL;
+      FinishScan (&s->HWParams);
+      *len = 0;
+      DBG (DBG_MSG, "\n");
+      DBG (DBG_MSG, "sane_read: end of scan\n");
+      s->fCancelled = SANE_FALSE;
+      s->fScanning = SANE_FALSE;
+      return SANE_STATUS_EOF;
+    }
+
+  /* time to read the next line? */
+  if (s->iBytesLeft == 0)
+    {
+      /* read a line from the transfer buffer */
+      if (CircBufferGetLineEx (s->HWParams.iXferHandle, p, p->pabLineBuf,
+                               s->HWParams.iReversedHead, SANE_TRUE))
+        {
+          pMode->adaptFormat (p->pabLineBuf, s->iPixelsPerLine,
+                              s->aValues[optThreshold].w);
+          s->iBytesLeft = pMode->bytesPerLine (s->iPixelsPerLine);
+          s->iLinesLeft--;
+        }
+      /* stop scanning further, when the read action fails
+         because we try read after the end of the buffer */
+      else
+        {
+          FinishScan (&s->HWParams);
+          CircBufferExit (p);
+          free (p->pabLineBuf);
+          p->pabLineBuf = NULL;
+          *len = 0;
+          DBG (DBG_MSG, "\n");
+          DBG (DBG_MSG, "sane_read: read after end of buffer\n");
+          s->fCancelled = SANE_FALSE;
+          s->fScanning = SANE_FALSE;
+          return SANE_STATUS_EOF;
+        }
+
+    }
+
+  /* copy (part of) a line */
+  *len = MIN (maxlen, s->iBytesLeft);
+  memcpy (buf,
+          &p->pabLineBuf[pMode->bytesPerLine (s->iPixelsPerLine) -
+                         s->iBytesLeft], *len);
+  s->iBytesLeft -= *len;
+
+  DBG (DBG_MSG, " read=%d    \n", *len);
+
+  return SANE_STATUS_GOOD;
+}
+
+
+void
+sane_cancel (SANE_Handle h)
+{
+  TScanner *s;
+
+  DBG (DBG_MSG, "sane_cancel\n");
+
+  s = (TScanner *) h;
+  /* Make sure the scanner head returns home */
+  FinishScan (&s->HWParams);
+  /* delete allocated data */
+  if (s->fScanning)
+    {
+      CircBufferExit (&s->DataPipe);
+      free (s->DataPipe.pabLineBuf);
+      s->DataPipe.pabLineBuf = NULL;
+      DBG (DBG_MSG, "sane_cancel: freeing buffers\n");
+    }
+  s->fCancelled = SANE_TRUE;
+  s->fScanning = SANE_FALSE;
+}
+
+
+SANE_Status
+sane_set_io_mode (SANE_Handle h, SANE_Bool m)
+{
+  DBG (DBG_MSG, "sane_set_io_mode %s\n", m ? "non-blocking" : "blocking");
+
+  /* prevent compiler from complaining about unused parameters */
+  h = h;
+
+  if (m)
+    {
+      return SANE_STATUS_UNSUPPORTED;
+    }
+  return SANE_STATUS_GOOD;
+}
+
+
+SANE_Status
+sane_get_select_fd (SANE_Handle h, SANE_Int * fd)
+{
+  DBG (DBG_MSG, "sane_select_fd\n");
+
+  /* prevent compiler from complaining about unused parameters */
+  h = h;
+  fd = fd;
+
+  return SANE_STATUS_UNSUPPORTED;
+}