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sane-project-backends/backend/tamarack.c

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/* sane - Scanner Access Now Easy.
Copyright (C) 1996 David Mosberger-Tang
Copyright (C) 1997 R.E.Wolff@BitWizard.nl
This file is part of the SANE package.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston,
MA 02111-1307, USA.
Note: The exception that is mentioned in the other source files is
not here. If a case arises where you need the rights that that
exception gives you, Please do contact me, and we'll work something
out.
R.E.Wolff@BitWizard.nl
tel: +31-152137555
fax: +31-152138217
This file implements a SANE backend for Tamarack flatbed scanners. */
/*
This driver was written initially by changing all occurances of
"mustek" to "tamarack". This actuall worked without modification
for the manufacturer detection code! :-)
*/
#include "sane/config.h"
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <sys/time.h>
#include "sane/sane.h"
#include "sane/sanei.h"
#include "sane/saneopts.h"
#include "sane/sanei_scsi.h"
#include "sane/sanei_config.h"
/* For timeval... */
#ifdef DEBUG
#include <sys/time.h>
#endif
#define BACKEND_NAME tamarack
#include "sane/sanei_backend.h"
#include "tamarack.h"
#ifndef PATH_MAX
# define PATH_MAX 1024
#endif
#define TAMARACK_CONFIG_FILE "tamarack.conf"
#define MM_PER_INCH 25.4
static int num_devices;
static Tamarack_Device *first_dev;
static Tamarack_Scanner *first_handle;
static const SANE_String_Const mode_list[] =
{
"Thresholded", "Dithered", "Gray", "Color",
0
};
static const SANE_Range u8_range =
{
0, /* minimum */
255, /* maximum */
0 /* quantization */
};
/* David used " 100 << SANE_FIXED_SCALE_SHIFT ". This assumes that
* it is implemented that way. I want to hide the datatype.
*/
static const SANE_Range percentage_range =
{
SANE_FIX(-100), /* minimum */
SANE_FIX( 100), /* maximum */
SANE_FIX( 1 ) /* quantization */
};
/* David used " 100 << SANE_FIXED_SCALE_SHIFT ". This assumes that
* it is implemented that way. I want to hide the datatype.
*/
static const SANE_Range abs_percentage_range =
{
SANE_FIX( 0), /* minimum */
SANE_FIX( 100), /* maximum */
SANE_FIX( 1 ) /* quantization */
};
#define INQ_LEN 0x60
static const u_int8_t inquiry[] =
{
TAMARACK_SCSI_INQUIRY, 0x00, 0x00, 0x00, INQ_LEN, 0x00
};
static const u_int8_t test_unit_ready[] =
{
TAMARACK_SCSI_TEST_UNIT_READY, 0x00, 0x00, 0x00, 0x00, 0x00
};
static const u_int8_t stop[] =
{
TAMARACK_SCSI_START_STOP, 0x00, 0x00, 0x00, 0x00, 0x00
};
static const u_int8_t get_status[] =
{
TAMARACK_SCSI_GET_DATA_STATUS, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x0c, 0x00
};
static SANE_Status
wait_ready (int fd)
{
SANE_Status status;
int i;
for (i = 0; i < 1000; ++i)
{
DBG(3, "wait_ready: sending TEST_UNIT_READY\n");
status = sanei_scsi_cmd (fd, test_unit_ready, sizeof (test_unit_ready),
0, 0);
switch (status)
{
default:
/* Ignore errors while waiting for scanner to become ready.
Some SCSI drivers return EIO while the scanner is
returning to the home position. */
DBG(1, "wait_ready: test unit ready failed (%s)\n",
sane_strstatus (status));
/* fall through */
case SANE_STATUS_DEVICE_BUSY:
usleep (100000); /* retry after 100ms */
break;
case SANE_STATUS_GOOD:
return status;
}
}
DBG(1, "wait_ready: timed out after %d attempts\n", i);
return SANE_STATUS_INVAL;
}
static SANE_Status
sense_handler (int scsi_fd, u_char *result, void *arg)
{
switch (result[0])
{
case 0x00:
break;
default:
DBG(1, "sense_handler: got unknown sense code %02x\n", result[0]);
return SANE_STATUS_IO_ERROR;
}
return SANE_STATUS_GOOD;
}
/* XXX This might leak the memory to a TAMARACK string */
static SANE_Status
attach (const char *devname, Tamarack_Device **devp)
{
char result[INQ_LEN];
int fd;
Tamarack_Device *dev;
SANE_Status status;
size_t size;
char *mfg, *model;
char *p;
for (dev = first_dev; 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(3, "attach: sending INQUIRY\n");
size = sizeof (result);
status = sanei_scsi_cmd (fd, inquiry, sizeof (inquiry), result, &size);
if (status != SANE_STATUS_GOOD || size != INQ_LEN) {
DBG(1, "attach: inquiry failed (%s)\n", sane_strstatus (status));
sanei_scsi_close (fd);
return status;
}
status = wait_ready (fd);
sanei_scsi_close (fd);
if (status != SANE_STATUS_GOOD)
return status;
result[33]= '\0';
p = strchr(result+16,' ');
if (p) *p = '\0';
model = strdup (result+16);
result[16]= '\0';
p = strchr(result+8,' ');
if (p) *p = '\0';
mfg = strdup (result+8);
DBG(1, "attach: Inquiry gives mfg=%s, model=%s.\n", mfg, model);
if (strcmp (mfg, "TAMARACK") != 0) {
DBG(1, "attach: device doesn't look like a Tamarack scanner "
"(result[0]=%#02x)\n", result[0]);
return SANE_STATUS_INVAL;
}
dev = malloc (sizeof (*dev));
if (!dev)
return SANE_STATUS_NO_MEM;
memset (dev, 0, sizeof (*dev));
dev->sane.name = strdup (devname);
dev->sane.vendor = "Tamarack";
dev->sane.model = model;
dev->sane.type = "flatbed scanner";
dev->x_range.min = 0;
dev->y_range.min = 0;
dev->x_range.quant = 0;
dev->y_range.quant = 0;
dev->dpi_range.min = SANE_FIX (1);
dev->dpi_range.quant = SANE_FIX (1);
dev->x_range.max = SANE_FIX (8.5 * MM_PER_INCH);
dev->y_range.max = SANE_FIX (11.0 * MM_PER_INCH);
dev->dpi_range.max = SANE_FIX (600);
DBG(3, "attach: found Tamarack scanner model %s (%s)\n",
dev->sane.model, dev->sane.type);
++num_devices;
dev->next = first_dev;
first_dev = dev;
if (devp)
*devp = dev;
return SANE_STATUS_GOOD;
}
static size_t
max_string_size (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;
}
static SANE_Status
constrain_value (Tamarack_Scanner *s, SANE_Int option, void *value,
SANE_Int *info)
{
return sanei_constrain_value (s->opt + option, value, info);
}
static unsigned char sign_mag (double val)
{
if (val > 100) val = 100;
if (val < -100) val = -100;
if (val >= 0) return ( val);
else return ((unsigned char)(-val)) | 0x80;
}
static SANE_Status
scan_area_and_windows (Tamarack_Scanner *s)
{
struct def_win_par dwp;
memset (&dwp,'\0',sizeof (dwp));
dwp.dwph.opc = TAMARACK_SCSI_AREA_AND_WINDOWS;
set_triple (dwp.dwph.len,8 + sizeof (dwp.wdb));
set_double (dwp.wdh.wpll, sizeof (dwp.wdb));
dwp.wdb.winid = WINID;
set_double (dwp.wdb.xres, (int) SANE_UNFIX (s->val[OPT_RESOLUTION].w));
set_double (dwp.wdb.yres, (int) SANE_UNFIX (s->val[OPT_RESOLUTION].w));
set_quad (dwp.wdb.ulx, (int) (47.2 * SANE_UNFIX (s->val[OPT_TL_X].w)));
set_quad (dwp.wdb.uly, (int) (47.2 * SANE_UNFIX (s->val[OPT_TL_Y].w)));
set_quad (dwp.wdb.width,
(int) (47.2 * SANE_UNFIX (s->val[OPT_BR_X].w - s->val[OPT_TL_X].w)));
set_quad (dwp.wdb.length,
(int) (47.2 * SANE_UNFIX (s->val[OPT_BR_Y].w - s->val[OPT_TL_Y].w)));
dwp.wdb.brightness = sign_mag (SANE_UNFIX (s->val[OPT_BRIGHTNESS].w));
dwp.wdb.contrast = sign_mag (SANE_UNFIX (s->val[OPT_CONTRAST].w));
dwp.wdb.thresh = 0x80;
switch (s->mode) {
case THRESHOLDED:
dwp.wdb.bpp = 1;
dwp.wdb.image_comp = 0;
dwp.wdb.thresh = 1 + 2.55 * (SANE_UNFIX (s->val[OPT_THRESHOLD].w));
break;
case DITHERED:
dwp.wdb.bpp = 1;
dwp.wdb.image_comp = 1;
break;
case GREYSCALE:
dwp.wdb.bpp = 8;
dwp.wdb.image_comp = 2;
break;
case TRUECOLOR:
dwp.wdb.bpp = 8;
dwp.wdb.image_comp = 2;
break;
default:
DBG(1, "Invalid mode. %d\n", s->mode);
return SANE_STATUS_INVAL;
}
DBG(1, "bright, thresh, contrast = %d(%5.1f), %d, %d(%5.1f)\n",
dwp.wdb.brightness, SANE_UNFIX (s->val[OPT_BRIGHTNESS].w),
dwp.wdb.thresh ,
dwp.wdb.contrast , SANE_UNFIX (s->val[OPT_CONTRAST].w));
set_double (dwp.wdb.halftone, 1); /* XXX What does this do again ? */
dwp.wdb.pad_type = 3; /* This is the only usable pad-type. */
dwp.wdb.exposure = 0x6f; /* XXX Option? */
dwp.wdb.compr_type = 0;
/* XXX Shouldn't this be sizeof (dwp) */
return sanei_scsi_cmd (s->fd, &dwp, (10+8+38), 0, 0);
}
static SANE_Status
mode_select (Tamarack_Scanner *s)
{
struct {
struct command_header cmd;
struct page_header hdr;
struct tamarack_page page;
} c;
memset (&c, '\0', sizeof (c));
c.cmd.opc = TAMARACK_SCSI_MODE_SELECT;
c.cmd.pad0[0] = 0x10; /* Suddenly the pad bytes are no long pad... */
c.cmd.pad0[1] = 0;
c.cmd.len = sizeof (struct page_header) + sizeof (struct tamarack_page);
c.hdr.code = 0;
c.hdr.length = 6;
c.page.gamma = 2;
c.page.thresh = 0x80; /* XXX Option? */
switch (s->mode) {
case THRESHOLDED:
case DITHERED:
case GREYSCALE:
c.page.masks = 0x80;
break;
case TRUECOLOR:
c.page.masks = 0x40 >> s->pass;
break;
}
c.page.delay = 0x10; /* XXX Option? */
c.page.features = (s->val[OPT_TRANS].w ? TAM_TRANS_ON:0) | 1;
return sanei_scsi_cmd (s->fd, &c, sizeof (c), 0, 0);
}
static SANE_Status
start_scan (Tamarack_Scanner *s)
{
struct {
struct command_header cmd;
unsigned char winid[1];
} c;
memset (&c,'\0',sizeof (c));
c.cmd.opc = TAMARACK_SCSI_START_STOP;
c.cmd.len = sizeof (c.winid);
c.winid[0] = WINID;
return sanei_scsi_cmd (s->fd, &c, sizeof (c), 0, 0);
}
static SANE_Status
stop_scan (Tamarack_Scanner *s)
{
/* XXX I don't think a TAMARACK can stop in mid-scan. Just stop
sending it requests for data....
*/
return sanei_scsi_cmd (s->fd, stop, sizeof (stop), 0, 0);
}
static SANE_Status
do_eof (Tamarack_Scanner *s)
{
if (s->pipe >= 0)
{
close (s->pipe);
s->pipe = -1;
}
return SANE_STATUS_EOF;
}
static SANE_Status
do_cancel (Tamarack_Scanner *s)
{
s->scanning = SANE_FALSE;
s->pass = 0;
do_eof (s);
if (s->reader_pid > 0)
{
int exit_status;
/* ensure child knows it's time to stop: */
kill (s->reader_pid, SIGTERM);
while (wait (&exit_status) != s->reader_pid);
s->reader_pid = 0;
}
if (s->fd >= 0)
{
stop_scan (s);
sanei_scsi_close (s->fd);
s->fd = -1;
}
return SANE_STATUS_CANCELLED;
}
static SANE_Status
get_image_status (Tamarack_Scanner *s)
{
u_int8_t result[12];
SANE_Status status;
size_t len;
int busy;
#if 1
do
{
len = sizeof (result);
status = sanei_scsi_cmd (s->fd, get_status, sizeof (get_status),
result, &len);
if ((status != SANE_STATUS_GOOD) && (status != SANE_STATUS_DEVICE_BUSY))
return status;
busy = (result[2] != 8) || (status == SANE_STATUS_DEVICE_BUSY);
if (busy)
usleep (100000);
if (!s->scanning)
return do_cancel (s);
}
while (busy);
#else
/* XXX Test if this works one day... */
wait_ready (s);
#endif
len = sizeof (result);
status = sanei_scsi_cmd (s->fd, get_status, sizeof (get_status),
result, &len);
if ((status != SANE_STATUS_GOOD) && (status != SANE_STATUS_DEVICE_BUSY))
return status;
s->params.bytes_per_line =
result[ 8] | (result[ 7] << 8) | (result[6] << 16);
s->params.lines =
result[11] | (result[10] << 8) | (result[9] << 16);
switch (s->mode) {
case DITHERED:
case THRESHOLDED:
s->params.pixels_per_line = 8 * s->params.bytes_per_line;
break;
case GREYSCALE:
case TRUECOLOR:
s->params.pixels_per_line = s->params.bytes_per_line;
break;
}
DBG(1, "get_image_status: bytes_per_line=%d, lines=%d\n",
s->params.bytes_per_line, s->params.lines);
return SANE_STATUS_GOOD;
}
static SANE_Status
read_data (Tamarack_Scanner *s, SANE_Byte *buf, int lines, int bpl)
{
struct command_header_10 cmd;
size_t nbytes;
SANE_Status status;
#ifdef DEBUG
int dt;
struct timeval tv_start,tv_end;
#endif
nbytes = bpl * lines;
memset (&cmd,'\0',sizeof (cmd));
cmd.opc = 0x28;
set_triple (cmd.len,nbytes);
#ifdef DEBUG
if (verbose) DBG (1, "Doing read_data... \n");
gettimeofday (&tv_start,NULL);
#endif
status = sanei_scsi_cmd (s->fd, &cmd, sizeof (cmd), buf, &nbytes);
#ifdef DEBUG
gettimeofday (&tv_end,NULL);
dt = tv_end.tv_usec - tv_start.tv_usec +
(tv_end.tv_sec - tv_start.tv_sec) * 1000000;
if (verbose) DBG(1, "Read took %d.%06d seconds.",
dt/1000000,dt%1000000);
dt = 1000000 * nbytes / dt;
if (verbose) DBG(1, "which is %d.%03d bytes per second.\n",dt,0);
#endif
return status;
}
static SANE_Status
init_options (Tamarack_Scanner *s)
{
int i;
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].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 = "Select the scan mode";
s->opt[OPT_MODE].type = SANE_TYPE_STRING;
s->opt[OPT_MODE].size = max_string_size (mode_list);
s->opt[OPT_MODE].constraint_type = SANE_CONSTRAINT_STRING_LIST;
s->opt[OPT_MODE].constraint.string_list = mode_list;
s->val[OPT_MODE].s = strdup (mode_list[OPT_MODE_DEFAULT]);
/* 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_FIXED;
s->opt[OPT_RESOLUTION].unit = SANE_UNIT_DPI;
s->opt[OPT_RESOLUTION].constraint_type = SANE_CONSTRAINT_RANGE;
s->opt[OPT_RESOLUTION].constraint.range = &s->hw->dpi_range;
s->val[OPT_RESOLUTION].w = SANE_FIX (OPT_RESOLUTION_DEFAULT);
/* preview */
s->opt[OPT_PREVIEW].name = SANE_NAME_PREVIEW;
s->opt[OPT_PREVIEW].title = SANE_TITLE_PREVIEW;
s->opt[OPT_PREVIEW].desc = SANE_DESC_PREVIEW;
s->opt[OPT_PREVIEW].cap = SANE_CAP_SOFT_DETECT | SANE_CAP_SOFT_SELECT;
s->val[OPT_PREVIEW].w = 0;
/* gray preview */
s->opt[OPT_GRAY_PREVIEW].name = SANE_NAME_GRAY_PREVIEW;
s->opt[OPT_GRAY_PREVIEW].title = SANE_TITLE_GRAY_PREVIEW;
s->opt[OPT_GRAY_PREVIEW].desc = SANE_DESC_GRAY_PREVIEW;
s->opt[OPT_GRAY_PREVIEW].type = SANE_TYPE_BOOL;
s->val[OPT_GRAY_PREVIEW].w = SANE_FALSE;
/* "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 = &s->hw->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 = &s->hw->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 = &s->hw->x_range;
s->val[OPT_BR_X].w = s->hw->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 = &s->hw->y_range;
s->val[OPT_BR_Y].w = s->hw->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;
/* transparency adapter. */
s->opt[OPT_TRANS].name = "transparency";
s->opt[OPT_TRANS].title = "transparency";
s->opt[OPT_TRANS].desc = "Turn on the transparency adapter.";
s->opt[OPT_TRANS].type = SANE_TYPE_BOOL;
s->opt[OPT_TRANS].unit = SANE_UNIT_NONE;
s->val[OPT_TRANS].w = SANE_FALSE;
/* brightness */
s->opt[OPT_BRIGHTNESS].name = SANE_NAME_BRIGHTNESS;
s->opt[OPT_BRIGHTNESS].title = SANE_TITLE_BRIGHTNESS;
s->opt[OPT_BRIGHTNESS].desc = SANE_DESC_BRIGHTNESS
" This option is active for lineart/halftone modes only. "
"For multibit modes (grey/color) use the gamma-table(s).";
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 = SANE_FIX(0);
/* contrast */
s->opt[OPT_CONTRAST].name = SANE_NAME_CONTRAST;
s->opt[OPT_CONTRAST].title = SANE_TITLE_CONTRAST;
s->opt[OPT_CONTRAST].desc = SANE_DESC_CONTRAST
" This option is active for lineart/halftone modes only. "
"For multibit modes (grey/color) use the gamma-table(s).";
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 = SANE_FIX(0);
/* Threshold */
s->opt[OPT_THRESHOLD].name = "Threshold";
s->opt[OPT_THRESHOLD].title = "Threshold";
s->opt[OPT_THRESHOLD].desc = "Threshold: below this level is black, above is white"
" This option is active for bitmap modes only. ";
s->opt[OPT_THRESHOLD].type = SANE_TYPE_FIXED;
s->opt[OPT_THRESHOLD].unit = SANE_UNIT_PERCENT;
s->opt[OPT_THRESHOLD].constraint_type = SANE_CONSTRAINT_RANGE;
s->opt[OPT_THRESHOLD].constraint.range = &abs_percentage_range;
s->val[OPT_THRESHOLD].w = SANE_FIX(50);
s->opt[OPT_THRESHOLD].cap |= SANE_CAP_INACTIVE;
#if 0
/* custom-gamma table */
s->opt[OPT_CUSTOM_GAMMA].name = SANE_NAME_CUSTOM_GAMMA;
s->opt[OPT_CUSTOM_GAMMA].title = SANE_TITLE_CUSTOM_GAMMA;
s->opt[OPT_CUSTOM_GAMMA].desc = SANE_DESC_CUSTOM_GAMMA;
s->opt[OPT_CUSTOM_GAMMA].type = SANE_TYPE_BOOL;
s->opt[OPT_CUSTOM_GAMMA].cap |= SANE_CAP_INACTIVE;
s->val[OPT_CUSTOM_GAMMA].w = SANE_FALSE;
/* grayscale gamma vector */
s->opt[OPT_GAMMA_VECTOR].name = SANE_NAME_GAMMA_VECTOR;
s->opt[OPT_GAMMA_VECTOR].title = SANE_TITLE_GAMMA_VECTOR;
s->opt[OPT_GAMMA_VECTOR].desc = SANE_DESC_GAMMA_VECTOR;
s->opt[OPT_GAMMA_VECTOR].type = SANE_TYPE_INT;
s->opt[OPT_GAMMA_VECTOR].cap |= SANE_CAP_INACTIVE;
s->opt[OPT_GAMMA_VECTOR].unit = SANE_UNIT_NONE;
s->opt[OPT_GAMMA_VECTOR].size = 256 * sizeof (SANE_Word);
s->opt[OPT_GAMMA_VECTOR].constraint_type = SANE_CONSTRAINT_RANGE;
s->opt[OPT_GAMMA_VECTOR].constraint.range = &u8_range;
s->val[OPT_GAMMA_VECTOR].wa = &s->gamma_table[0][0];
/* red gamma vector */
s->opt[OPT_GAMMA_VECTOR_R].name = SANE_NAME_GAMMA_VECTOR_R;
s->opt[OPT_GAMMA_VECTOR_R].title = SANE_TITLE_GAMMA_VECTOR_R;
s->opt[OPT_GAMMA_VECTOR_R].desc = SANE_DESC_GAMMA_VECTOR_R;
s->opt[OPT_GAMMA_VECTOR_R].type = SANE_TYPE_INT;
s->opt[OPT_GAMMA_VECTOR_R].cap |= SANE_CAP_INACTIVE;
s->opt[OPT_GAMMA_VECTOR_R].unit = SANE_UNIT_NONE;
s->opt[OPT_GAMMA_VECTOR_R].size = 256 * sizeof (SANE_Word);
s->opt[OPT_GAMMA_VECTOR_R].constraint_type = SANE_CONSTRAINT_RANGE;
s->opt[OPT_GAMMA_VECTOR_R].constraint.range = &u8_range;
s->val[OPT_GAMMA_VECTOR_R].wa = &s->gamma_table[1][0];
/* green gamma vector */
s->opt[OPT_GAMMA_VECTOR_G].name = SANE_NAME_GAMMA_VECTOR_G;
s->opt[OPT_GAMMA_VECTOR_G].title = SANE_TITLE_GAMMA_VECTOR_G;
s->opt[OPT_GAMMA_VECTOR_G].desc = SANE_DESC_GAMMA_VECTOR_G;
s->opt[OPT_GAMMA_VECTOR_G].type = SANE_TYPE_INT;
s->opt[OPT_GAMMA_VECTOR_G].cap |= SANE_CAP_INACTIVE;
s->opt[OPT_GAMMA_VECTOR_G].unit = SANE_UNIT_NONE;
s->opt[OPT_GAMMA_VECTOR_G].size = 256 * sizeof (SANE_Word);
s->opt[OPT_GAMMA_VECTOR_G].constraint_type = SANE_CONSTRAINT_RANGE;
s->opt[OPT_GAMMA_VECTOR_G].constraint.range = &u8_range;
s->val[OPT_GAMMA_VECTOR_G].wa = &s->gamma_table[2][0];
/* blue gamma vector */
s->opt[OPT_GAMMA_VECTOR_B].name = SANE_NAME_GAMMA_VECTOR_B;
s->opt[OPT_GAMMA_VECTOR_B].title = SANE_TITLE_GAMMA_VECTOR_B;
s->opt[OPT_GAMMA_VECTOR_B].desc = SANE_DESC_GAMMA_VECTOR_B;
s->opt[OPT_GAMMA_VECTOR_B].type = SANE_TYPE_INT;
s->opt[OPT_GAMMA_VECTOR_B].cap |= SANE_CAP_INACTIVE;
s->opt[OPT_GAMMA_VECTOR_B].unit = SANE_UNIT_NONE;
s->opt[OPT_GAMMA_VECTOR_B].size = 256 * sizeof (SANE_Word);
s->opt[OPT_GAMMA_VECTOR_B].constraint_type = SANE_CONSTRAINT_RANGE;
s->opt[OPT_GAMMA_VECTOR_B].constraint.range = &u8_range;
s->val[OPT_GAMMA_VECTOR_B].wa = &s->gamma_table[3][0];
#endif
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 (Tamarack_Scanner *s, int fd)
{
SANE_Byte *data;
int lines_per_buffer, bpl;
SANE_Status status;
sigset_t sigterm_set;
FILE *fp;
sigemptyset (&sigterm_set);
sigaddset (&sigterm_set, SIGTERM);
fp = fdopen (fd, "w");
if (!fp)
return 1;
bpl = s->params.bytes_per_line;
lines_per_buffer = sanei_scsi_max_request_size / bpl;
if (!lines_per_buffer)
return 2; /* resolution is too high */
/* Limit the size of a single transfer to one inch.
XXX Add a stripsize option. */
if (lines_per_buffer > SANE_UNFIX (s->val[OPT_RESOLUTION].w))
lines_per_buffer = SANE_UNFIX (s->val[OPT_RESOLUTION].w);
DBG(3, "lines_per_buffer=%d, bytes_per_line=%d\n", lines_per_buffer, bpl);
data = malloc (lines_per_buffer * bpl);
for (s->line = 0; s->line < s->params.lines; s->line += lines_per_buffer) {
if (s->line + lines_per_buffer > s->params.lines)
/* do the last few lines: */
lines_per_buffer = s->params.lines - s->line;
sigprocmask (SIG_BLOCK, &sigterm_set, 0);
status = read_data (s, data, lines_per_buffer, bpl);
sigprocmask (SIG_UNBLOCK, &sigterm_set, 0);
if (status != SANE_STATUS_GOOD) {
DBG(1, "reader_process: read_data failed with status=%d\n", status);
return 3;
}
DBG(3, "reader_process: read %d lines\n", lines_per_buffer);
if ((s->mode == TRUECOLOR) || (s->mode == GREYSCALE)) {
fwrite (data, lines_per_buffer, bpl, fp);
} else {
/* in singlebit mode, the scanner returns 1 for black. ;-( --DM */
/* Hah! Same for Tamarack... -- REW */
int i;
for (i = 0; i < lines_per_buffer * bpl; ++i)
fputc (~data[i], fp);
}
}
fclose (fp);
return 0;
}
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;
DBG_INIT();
if (version_code)
*version_code = SANE_VERSION_CODE (V_MAJOR, V_MINOR, 0);
fp = sanei_config_open (TAMARACK_CONFIG_FILE);
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)
{
Tamarack_Device *dev, *next;
for (dev = first_dev; dev; dev = next) {
next = dev->next;
free ((void *) dev->sane.name);
free ((void *) dev->sane.model);
free (dev);
}
}
SANE_Status
sane_get_devices (const SANE_Device ***device_list, SANE_Bool local_only)
{
static const SANE_Device **devlist = 0;
Tamarack_Device *dev;
int i;
if (devlist)
free (devlist);
devlist = malloc ((num_devices + 1) * sizeof (devlist[0]));
if (!devlist)
return SANE_STATUS_NO_MEM;
i = 0;
for (dev = first_dev; i < num_devices; dev = dev->next)
devlist[i++] = &dev->sane;
devlist[i++] = 0;
*device_list = devlist;
return SANE_STATUS_GOOD;
}
SANE_Status
sane_open (SANE_String_Const devicename, SANE_Handle *handle)
{
Tamarack_Device *dev;
SANE_Status status;
Tamarack_Scanner *s;
int i, j;
if (devicename[0]) {
for (dev = first_dev; dev; dev = dev->next)
if (strcmp (dev->sane.name, devicename) == 0)
break;
if (!dev) {
status = attach (devicename, &dev);
if (status != SANE_STATUS_GOOD)
return status;
}
} else {
/* empty devicname -> use first device */
dev = first_dev;
}
if (!dev)
return SANE_STATUS_INVAL;
s = malloc (sizeof (*s));
if (!s)
return SANE_STATUS_NO_MEM;
memset (s, 0, sizeof (*s));
s->fd = -1;
s->pipe = -1;
s->hw = dev;
for (i = 0; i < 4; ++i)
for (j = 0; j < 256; ++j)
s->gamma_table[i][j] = j;
init_options (s);
/* insert newly opened handle into list of open handles: */
s->next = first_handle;
first_handle = s;
*handle = s;
return SANE_STATUS_GOOD;
}
void
sane_close (SANE_Handle handle)
{
Tamarack_Scanner *prev, *s;
/* remove handle from list of open handles: */
prev = 0;
for (s = first_handle; s; s = s->next) {
if (s == handle)
break;
prev = s;
}
if (!s) {
DBG(1, "close: invalid handle %p\n", handle);
return; /* oops, not a handle we know about */
}
if (s->scanning)
do_cancel (handle);
if (prev)
prev->next = s->next;
else
first_handle = s->next;
free (handle);
}
const SANE_Option_Descriptor *
sane_get_option_descriptor (SANE_Handle handle, SANE_Int option)
{
Tamarack_Scanner *s = handle;
if ((unsigned) option >= NUM_OPTIONS)
return 0;
return s->opt + option;
}
static int make_mode (char *mode)
{
if (strcmp (mode, "Thresholded") == 0)
return THRESHOLDED;
if (strcmp (mode, "Dithered") == 0)
return DITHERED;
else if (strcmp (mode, "Gray") == 0)
return GREYSCALE;
else if (strcmp (mode, "Color") == 0)
return TRUECOLOR;
return -1;
}
SANE_Status
sane_control_option (SANE_Handle handle, SANE_Int option,
SANE_Action action, void *val, SANE_Int *info)
{
Tamarack_Scanner *s = handle;
SANE_Status status;
SANE_Word cap;
if (info)
*info = 0;
if (s->scanning)
return SANE_STATUS_DEVICE_BUSY;
if (option >= NUM_OPTIONS)
return SANE_STATUS_INVAL;
cap = s->opt[option].cap;
if (!SANE_OPTION_IS_ACTIVE (cap))
return SANE_STATUS_INVAL;
if (action == SANE_ACTION_GET_VALUE) {
switch (option) {
/* word options: */
case OPT_PREVIEW:
case OPT_GRAY_PREVIEW:
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_TRANS:
case OPT_BRIGHTNESS:
case OPT_CONTRAST:
case OPT_THRESHOLD:
#if 0
case OPT_CUSTOM_GAMMA:
#endif
*(SANE_Word *) val = s->val[option].w;
return SANE_STATUS_GOOD;
#if 0
/* word-array options: */
case OPT_GAMMA_VECTOR:
case OPT_GAMMA_VECTOR_R:
case OPT_GAMMA_VECTOR_G:
case OPT_GAMMA_VECTOR_B:
memcpy (val, s->val[option].wa, s->opt[option].size);
return SANE_STATUS_GOOD;
#endif
/* string options: */
case OPT_MODE:
strcpy (val, s->val[option].s);
return SANE_STATUS_GOOD;
}
} else if (action == SANE_ACTION_SET_VALUE) {
if (!SANE_OPTION_IS_SETTABLE (cap))
return SANE_STATUS_INVAL;
status = constrain_value (s, option, val, info);
if (status != SANE_STATUS_GOOD)
return status;
switch (option)
{
/* (mostly) side-effect-free word options: */
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;
/* fall through */
case OPT_PREVIEW:
case OPT_GRAY_PREVIEW:
case OPT_BRIGHTNESS:
case OPT_CONTRAST:
case OPT_THRESHOLD:
case OPT_TRANS:
s->val[option].w = *(SANE_Word *) val;
return SANE_STATUS_GOOD;
#if 0
/* side-effect-free word-array options: */
case OPT_GAMMA_VECTOR:
case OPT_GAMMA_VECTOR_R:
case OPT_GAMMA_VECTOR_G:
case OPT_GAMMA_VECTOR_B:
memcpy (s->val[option].wa, val, s->opt[option].size);
return SANE_STATUS_GOOD;
/* options with side-effects: */
case OPT_CUSTOM_GAMMA:
w = *(SANE_Word *) val;
if (w == s->val[OPT_CUSTOM_GAMMA].w)
return SANE_STATUS_GOOD; /* no change */
s->val[OPT_CUSTOM_GAMMA].w = w;
if (w) {
s->mode = make_mode (s->val[OPT_MODE].s);
if (s->mode == GREYSCALE) {
s->opt[OPT_GAMMA_VECTOR].cap &= ~SANE_CAP_INACTIVE;
} else if (s->mode == TRUECOLOR) {
s->opt[OPT_GAMMA_VECTOR].cap &= ~SANE_CAP_INACTIVE;
s->opt[OPT_GAMMA_VECTOR_R].cap &= ~SANE_CAP_INACTIVE;
s->opt[OPT_GAMMA_VECTOR_G].cap &= ~SANE_CAP_INACTIVE;
s->opt[OPT_GAMMA_VECTOR_B].cap &= ~SANE_CAP_INACTIVE;
}
} else {
s->opt[OPT_GAMMA_VECTOR].cap |= SANE_CAP_INACTIVE;
s->opt[OPT_GAMMA_VECTOR_R].cap |= SANE_CAP_INACTIVE;
s->opt[OPT_GAMMA_VECTOR_G].cap |= SANE_CAP_INACTIVE;
s->opt[OPT_GAMMA_VECTOR_B].cap |= SANE_CAP_INACTIVE;
}
if (info)
*info |= SANE_INFO_RELOAD_OPTIONS;
return SANE_STATUS_GOOD;
#endif
case OPT_MODE:
{
if (s->val[option].s)
free (s->val[option].s);
s->val[option].s = strdup (val);
s->mode = make_mode (s->val[OPT_MODE].s);
if (info)
*info |= SANE_INFO_RELOAD_OPTIONS | SANE_INFO_RELOAD_PARAMS;
s->opt[OPT_BRIGHTNESS].cap |= SANE_CAP_INACTIVE;
s->opt[OPT_CONTRAST].cap |= SANE_CAP_INACTIVE;
s->opt[OPT_THRESHOLD].cap |= SANE_CAP_INACTIVE;
#if 0
s->opt[OPT_CUSTOM_GAMMA].cap |= SANE_CAP_INACTIVE;
s->opt[OPT_GAMMA_VECTOR].cap |= SANE_CAP_INACTIVE;
s->opt[OPT_GAMMA_VECTOR_R].cap |= SANE_CAP_INACTIVE;
s->opt[OPT_GAMMA_VECTOR_G].cap |= SANE_CAP_INACTIVE;
s->opt[OPT_GAMMA_VECTOR_B].cap |= SANE_CAP_INACTIVE;
#endif
if (strcmp (val, "Thresholded") == 0)
s->opt[OPT_THRESHOLD].cap &= ~SANE_CAP_INACTIVE;
else {
s->opt[OPT_BRIGHTNESS].cap &= ~SANE_CAP_INACTIVE;
s->opt[OPT_CONTRAST].cap &= ~SANE_CAP_INACTIVE;
}
#if 0
if (!binary)
s->opt[OPT_CUSTOM_GAMMA].cap &= ~SANE_CAP_INACTIVE;
if (s->val[OPT_CUSTOM_GAMMA].w) {
if (strcmp (val, "Gray") == 0)
s->opt[OPT_GAMMA_VECTOR].cap &= ~SANE_CAP_INACTIVE;
else if (strcmp (val, "Color") == 0) {
s->opt[OPT_GAMMA_VECTOR].cap &= ~SANE_CAP_INACTIVE;
s->opt[OPT_GAMMA_VECTOR_R].cap &= ~SANE_CAP_INACTIVE;
s->opt[OPT_GAMMA_VECTOR_G].cap &= ~SANE_CAP_INACTIVE;
s->opt[OPT_GAMMA_VECTOR_B].cap &= ~SANE_CAP_INACTIVE;
}
}
#endif
return SANE_STATUS_GOOD;
}
}
}
return SANE_STATUS_INVAL;
}
SANE_Status
sane_get_parameters (SANE_Handle handle, SANE_Parameters *params)
{
Tamarack_Scanner *s = handle;
if (!s->scanning) {
double width, height, dpi;
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 = SANE_UNFIX (s->val[OPT_RESOLUTION].w);
s->mode = make_mode (s->val[OPT_MODE].s);
DBG(1, "got mode '%s' -> %d.\n", s->val[OPT_MODE].s, s->mode);
/* 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;
s->params.lines = height * dots_per_mm;
}
if ((s->mode == THRESHOLDED) || (s->mode == DITHERED)) {
s->params.format = SANE_FRAME_GRAY;
s->params.bytes_per_line = (s->params.pixels_per_line + 7) / 8;
s->params.depth = 1;
} else if (s->mode == GREYSCALE) {
s->params.format = SANE_FRAME_GRAY;
s->params.bytes_per_line = s->params.pixels_per_line;
s->params.depth = 8;
} else {
s->params.format = SANE_FRAME_RED + s->pass;
s->params.bytes_per_line = s->params.pixels_per_line;
s->params.depth = 8;
}
s->pass = 0;
} else {
if (s->mode == TRUECOLOR)
s->params.format = SANE_FRAME_RED + s->pass;
}
s->params.last_frame = (s->mode != TRUECOLOR) || (s->pass == 2);
if (params)
*params = s->params;
DBG(1, "Got parameters: format:%d, ppl: %d, bpl:%d, depth:%d, "
"last %d pass %d\n",
s->params.format, s->params.pixels_per_line,
s->params.bytes_per_line, s->params.depth,
s->params.last_frame, s->pass);
return SANE_STATUS_GOOD;
}
SANE_Status
sane_start (SANE_Handle handle)
{
Tamarack_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;
if (s->fd < 0) {
/* translate options into s->mode for convenient access: */
s->mode = make_mode (s->val[OPT_MODE].s);
if (s->mode == TRUECOLOR)
{
if (s->val[OPT_PREVIEW].w && s->val[OPT_GRAY_PREVIEW].w) {
/* Force gray-scale mode when previewing. */
s->mode = GREYSCALE;
s->params.format = SANE_FRAME_GRAY;
s->params.bytes_per_line = s->params.pixels_per_line;
s->params.last_frame = SANE_TRUE;
}
}
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));
return status;
}
}
status = wait_ready (s->fd);
if (status != SANE_STATUS_GOOD) {
DBG(1, "open: wait_ready() failed: %s\n", sane_strstatus (status));
goto stop_scanner_and_return;
}
status = scan_area_and_windows (s);
if (status != SANE_STATUS_GOOD) {
DBG(1, "open: set scan area command failed: %s\n",
sane_strstatus (status));
goto stop_scanner_and_return;
}
status = mode_select (s);
if (status != SANE_STATUS_GOOD)
goto stop_scanner_and_return;
s->scanning = SANE_TRUE;
status = start_scan (s);
if (status != SANE_STATUS_GOOD)
goto stop_scanner_and_return;
status = get_image_status (s);
if (status != SANE_STATUS_GOOD)
goto stop_scanner_and_return;
s->line = 0;
if (pipe (fds) < 0)
return SANE_STATUS_IO_ERROR;
s->reader_pid = fork ();
if (s->reader_pid == 0) {
sigset_t ignore_set;
struct SIGACTION act;
close (fds[0]);
sigfillset (&ignore_set);
sigdelset (&ignore_set, SIGTERM);
sigprocmask (SIG_SETMASK, &ignore_set, 0);
memset (&act, 0, sizeof (act));
sigaction (SIGTERM, &act, 0);
/* don't use exit() since that would run the atexit() handlers... */
_exit (reader_process (s, fds[1]));
}
close (fds[1]);
s->pipe = fds[0];
return SANE_STATUS_GOOD;
stop_scanner_and_return:
do_cancel (s);
return status;
}
SANE_Status
sane_read (SANE_Handle handle, SANE_Byte *buf, SANE_Int max_len, SANE_Int *len)
{
Tamarack_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)
{
Tamarack_Scanner *s = handle;
if (s->reader_pid > 0)
kill (s->reader_pid, SIGTERM);
s->scanning = SANE_FALSE;
}
SANE_Status
sane_set_io_mode (SANE_Handle handle, SANE_Bool non_blocking)
{
Tamarack_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)
{
Tamarack_Scanner *s = handle;
if (!s->scanning)
return SANE_STATUS_INVAL;
*fd = s->pipe;
return SANE_STATUS_GOOD;
}
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