--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/thirdparty/tesseract/src/ccstruct/quadlsq.h	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,70 @@
+/**********************************************************************
+ * File:        quadlsq.h  (Formerly qlsq.h)
+ * Description: Code for least squares approximation of quadratics.
+ * Author:      Ray Smith
+ *
+ * (C) Copyright 1993, 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 QUADLSQ_H
+#define QUADLSQ_H
+
+#include "points.h"
+
+namespace tesseract {
+
+class QLSQ {
+public:
+  QLSQ() {   // constructor
+    clear(); // set to zeros
+  }
+  void clear(); // initialize
+
+  void add(     // add element
+      double x, // coords to add
+      double y);
+  void remove(  // delete element
+      double x, // coords to delete
+      double y);
+  int32_t count() { // no of elements
+    return n;
+  }
+
+  void fit(        // fit the given
+      int degree); // return actual
+  double get_a() const { // get x squard
+    return a;
+  }
+  double get_b() const { // get x squard
+    return b;
+  }
+  double get_c() const { // get x squard
+    return c;
+  }
+
+private:
+  int32_t n;           // no of elements
+  double a, b, c;      // result
+  double sigx;         // sum of x
+  double sigy;         // sum of y
+  double sigxx;        // sum x squared
+  double sigxy;        // sum of xy
+  double sigyy;        // sum y squared
+  long double sigxxx;  // sum x cubed
+  long double sigxxy;  // sum xsquared y
+  long double sigxxxx; // sum x fourth
+};
+
+} // namespace tesseract
+
+#endif