--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/thirdparty/tesseract/src/training/merge_unicharsets.cpp	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,57 @@
+///////////////////////////////////////////////////////////////////////
+// File:        merge_unicharsets.cpp
+// Description: Simple tool to merge two or more unicharsets.
+// Author:      Ray Smith
+//
+// (C) Copyright 2015, Google Inc.
+// 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.
+//
+///////////////////////////////////////////////////////////////////////
+
+#include "commontraining.h" // CheckSharedLibraryVersion
+#include "unicharset.h"
+
+int main(int argc, char **argv) {
+  tesseract::CheckSharedLibraryVersion();
+
+  if (argc > 1 && (!strcmp(argv[1], "-v") || !strcmp(argv[1], "--version"))) {
+    printf("%s\n", tesseract::TessBaseAPI::Version());
+    return EXIT_SUCCESS;
+  } else if (argc < 4) {
+    // Print usage
+    printf(
+        "Usage: %s -v | --version |\n"
+        "       %s unicharset-in-1 ... unicharset-in-n unicharset-out\n",
+        argv[0], argv[0]);
+    return EXIT_FAILURE;
+  }
+
+  tesseract::UNICHARSET input_unicharset, result_unicharset;
+  for (int arg = 1; arg < argc - 1; ++arg) {
+    // Load the input unicharset
+    if (input_unicharset.load_from_file(argv[arg])) {
+      printf("Loaded unicharset of size %zu from file %s\n", input_unicharset.size(), argv[arg]);
+      result_unicharset.AppendOtherUnicharset(input_unicharset);
+    } else {
+      printf("Failed to load unicharset from file %s!!\n", argv[arg]);
+      return EXIT_FAILURE;
+    }
+  }
+
+  // Save the combined unicharset.
+  if (result_unicharset.save_to_file(argv[argc - 1])) {
+    printf("Wrote unicharset file %s.\n", argv[argc - 1]);
+  } else {
+    printf("Cannot save unicharset file %s.\n", argv[argc - 1]);
+    return EXIT_FAILURE;
+  }
+  return EXIT_SUCCESS;
+}