--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/thirdparty/tesseract/src/ccstruct/mod128.h	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,88 @@
+/**********************************************************************
+ * File:        mod128.h  (Formerly dir128.h)
+ * Description: Header for class which implements modulo arithmetic.
+ * Author:      Ray Smith
+ *
+ * (C) Copyright 1991, Hewlett-Packard Ltd.
+ ** Licensed under the Apache License, Version 2.0 (the "License");
+ ** you may not use this file except in compliance with the License.
+ ** You may obtain a copy of the License at
+ ** http://www.apache.org/licenses/LICENSE-2.0
+ ** Unless required by applicable law or agreed to in writing, software
+ ** distributed under the License is distributed on an "AS IS" BASIS,
+ ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ ** See the License for the specific language governing permissions and
+ ** limitations under the License.
+ *
+ **********************************************************************/
+
+#ifndef MOD128_H
+#define MOD128_H
+
+#include "points.h"
+
+namespace tesseract {
+
+#define MODULUS 128   /*range of directions */
+#define DIRBITS 7     // no of bits used
+#define DIRSCALE 1000 // length of vector
+
+class DIR128 {
+public:
+  DIR128() = default;
+
+  DIR128(              // constructor
+      int16_t value) { // value to assign
+    value %= MODULUS;  // modulo arithmetic
+    if (value < 0) {
+      value += MODULUS; // done properly
+    }
+    dir = static_cast<int8_t>(value);
+  }
+  DIR128(const FCOORD fc); // quantize vector
+
+  DIR128 &operator=(   // assign of int16_t
+      int16_t value) { // value to assign
+    value %= MODULUS;  // modulo arithmetic
+    if (value < 0) {
+      value += MODULUS; // done properly
+    }
+    dir = static_cast<int8_t>(value);
+    return *this;
+  }
+  int8_t operator-(              // subtraction
+      const DIR128 &minus) const // for signed result
+  {
+    // result
+    int16_t result = dir - minus.dir;
+
+    if (result > MODULUS / 2) {
+      result -= MODULUS; // get in range
+    } else if (result < -MODULUS / 2) {
+      result += MODULUS;
+    }
+    return static_cast<int8_t>(result);
+  }
+  DIR128 operator+(            // addition
+      const DIR128 &add) const // of itself
+  {
+    DIR128 result; // sum
+
+    result = dir + add.dir; // let = do the work
+    return result;
+  }
+  DIR128 &operator+=( // same as +
+      const DIR128 &add) {
+    *this = dir + add.dir; // let = do the work
+    return *this;
+  }
+  int8_t get_dir() const { // access function
+    return dir;
+  }
+
+  int8_t dir; // a direction
+};
+
+} // namespace tesseract
+
+#endif