--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/thirdparty/leptonica/src/sudoku.h	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,77 @@
+/*====================================================================*
+ -  Copyright (C) 2001 Leptonica.  All rights reserved.
+ -
+ -  Redistribution and use in source and binary forms, with or without
+ -  modification, are permitted provided that the following conditions
+ -  are met:
+ -  1. Redistributions of source code must retain the above copyright
+ -     notice, this list of conditions and the following disclaimer.
+ -  2. Redistributions in binary form must reproduce the above
+ -     copyright notice, this list of conditions and the following
+ -     disclaimer in the documentation and/or other materials
+ -     provided with the distribution.
+ -
+ -  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ -  ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ -  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ -  A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL ANY
+ -  CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ -  EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ -  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ -  PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ -  OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ -  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ -  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *====================================================================*/
+
+#ifndef SUDOKU_H_INCLUDED
+#define SUDOKU_H_INCLUDED
+
+/*!
+ * \file sudoku.h
+ *
+ * <pre>
+ *    The L_Sudoku holds all the information of the current state.
+ *
+ *    The input to sudokuCreate() is a file with any number of lines
+ *    starting with '#', followed by 9 lines consisting of 9 numbers
+ *    in each line.  These have the known values and use 0 for the unknowns.
+ *    Blank lines are ignored.
+ *
+ *    The %locs array holds the indices of the unknowns, numbered
+ *    left-to-right and top-to-bottom from 0 to 80.  The array size
+ *    is initialized to %num.  %current is the index into the %locs
+ *    array of the current guess: locs[current].
+ *
+ *    The %state array is used to determine the validity of each guess.
+ *    It is of size 81, and is initialized by setting the unknowns to 0
+ *    and the knowns to their input values.
+ * </pre>
+ */
+
+struct L_Sudoku
+{
+    l_int32        num;       /*!< number of unknowns                     */
+    l_int32       *locs;      /*!< location of unknowns                   */
+    l_int32        current;   /*!< index into %locs of current location   */
+    l_int32       *init;      /*!< initial state, with 0 representing     */
+                              /*!< the unknowns                           */
+    l_int32       *state;     /*!< present state, including inits and     */
+                              /*!< guesses of unknowns up to %current     */
+    l_int32        nguess;    /*!< shows current number of guesses        */
+    l_int32        finished;  /*!< set to 1 when solved                   */
+    l_int32        failure;   /*!< set to 1 if no solution is possible    */
+};
+typedef struct L_Sudoku  L_SUDOKU;
+
+
+    /*! For printing out array data */
+/*! Sudoku Output */
+enum {
+    L_SUDOKU_INIT = 0,
+    L_SUDOKU_STATE = 1
+};
+
+#endif /* SUDOKU_H_INCLUDED */
+
+