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diff --git a/backend/test.h b/backend/test.h
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+/* sane - Scanner Access Now Easy.
+
+   Copyright (C) 2002-2006 Henning Meier-Geinitz <henning@meier-geinitz.de>
+
+   This file is part of the SANE package.
+
+   This program is free software; you can redistribute it and/or
+   modify it under the terms of the GNU General Public License as
+   published by the Free Software Foundation; either version 2 of the
+   License, or (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+   MA 02111-1307, USA.
+
+   As a special exception, the authors of SANE give permission for
+   additional uses of the libraries contained in this release of SANE.
+
+   The exception is that, if you link a SANE library with other files
+   to produce an executable, this does not by itself cause the
+   resulting executable to be covered by the GNU General Public
+   License.  Your use of that executable is in no way restricted on
+   account of linking the SANE library code into it.
+
+   This exception does not, however, invalidate any other reasons why
+   the executable file might be covered by the GNU General Public
+   License.
+
+   If you submit changes to SANE to the maintainers to be included in
+   a subsequent release, you agree by submitting the changes that
+   those changes may be distributed with this exception intact.
+
+   If you write modifications of your own for SANE, it is your choice
+   whether to permit this exception to apply to your modifications.
+   If you do not wish that, delete this exception notice.
+
+   This backend is for testing frontends.
+*/
+
+#ifndef test_h
+#define test_h
+
+
+typedef enum
+{
+  param_none = 0,
+  param_bool,
+  param_int,
+  param_fixed,
+  param_string
+}
+parameter_type;
+
+typedef enum
+{
+  opt_num_opts = 0,
+  opt_mode_group,
+  opt_mode,
+  opt_depth,
+  opt_hand_scanner,
+  opt_three_pass,		/* 5 */
+  opt_three_pass_order,
+  opt_resolution,
+  opt_scan_source,
+  opt_special_group,
+  opt_test_picture,
+  opt_invert_endianess,
+  opt_read_limit,
+  opt_read_limit_size,
+  opt_read_delay,
+  opt_read_delay_duration,
+  opt_read_status_code,
+  opt_ppl_loss,
+  opt_fuzzy_parameters,
+  opt_non_blocking,
+  opt_select_fd,
+  opt_enable_test_options,
+  opt_print_options,
+  opt_geometry_group,
+  opt_tl_x,
+  opt_tl_y,
+  opt_br_x,
+  opt_br_y,
+  opt_bool_group,
+  opt_bool_soft_select_soft_detect,
+  opt_bool_hard_select_soft_detect,
+  opt_bool_hard_select,
+  opt_bool_soft_detect,
+  opt_bool_soft_select_soft_detect_emulated,
+  opt_bool_soft_select_soft_detect_auto,
+  opt_int_group,
+  opt_int,
+  opt_int_constraint_range,
+  opt_int_constraint_word_list,
+  opt_int_array,
+  opt_int_array_constraint_range,
+  opt_int_array_constraint_word_list,
+  opt_fixed_group,
+  opt_fixed,
+  opt_fixed_constraint_range,
+  opt_fixed_constraint_word_list,
+  opt_string_group,
+  opt_string,
+  opt_string_constraint_string_list,
+  opt_string_constraint_long_string_list,
+  opt_button_group,
+  opt_button,
+  /* must come last: */
+  num_options
+}
+test_opts;
+
+
+typedef struct Test_Device
+{
+  struct Test_Device *next;
+  SANE_Device sane;
+  SANE_Option_Descriptor opt[num_options];
+  Option_Value val[num_options];
+  SANE_Bool loaded[num_options];
+  SANE_Parameters params;
+  SANE_String name;
+  SANE_Pid reader_pid;
+  SANE_Int reader_fds;
+  SANE_Int pipe;
+  FILE *pipe_handle;
+  SANE_Word pass;
+  SANE_Word bytes_per_line;
+  SANE_Word pixels_per_line;
+  SANE_Word lines;
+  SANE_Int bytes_total;
+  SANE_Bool open;
+  SANE_Bool scanning;
+  SANE_Bool cancelled;
+  SANE_Bool eof;
+  SANE_Int number_of_scans;
+}
+Test_Device;
+
+#endif /* test_h */