--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/thirdparty/tesseract/src/training/ambiguous_words.cpp	Mon Sep 15 11:44:09 2025 +0200
@@ -0,0 +1,82 @@
+///////////////////////////////////////////////////////////////////////
+// File:        ambiguous_words.cpp
+// Description: A program that takes a text file with a list of words as
+//              input (one per line) and outputs a file with the words
+//              that were found in the dictionary followed by the words
+//              that are ambiguous to them.
+// Author:      Rika Antonova
+//
+// (C) Copyright 2011, 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 "dict.h"
+#include "tesseractclass.h"
+
+#include <tesseract/baseapi.h>
+#include "helpers.h"
+
+int main(int argc, char **argv) {
+  tesseract::CheckSharedLibraryVersion();
+
+  // Parse input arguments.
+  if (argc > 1 && (!strcmp(argv[1], "-v") || !strcmp(argv[1], "--version"))) {
+    printf("%s\n", tesseract::TessBaseAPI::Version());
+    return EXIT_SUCCESS;
+  } else if (argc != 4 && (argc != 6 || strcmp(argv[1], "-l") != 0)) {
+    printf(
+        "Usage: %s -v | --version | %s [-l lang] tessdata_dir wordlist_file"
+        " output_ambiguous_wordlist_file\n",
+        argv[0], argv[0]);
+    return EXIT_FAILURE;
+  }
+  int argv_offset = 0;
+  std::string lang;
+  if (argc == 6) {
+    lang = argv[2];
+    argv_offset = 2;
+  } else {
+    lang = "eng";
+  }
+  const char *tessdata_dir = argv[++argv_offset];
+  const char *input_file_str = argv[++argv_offset];
+  const char *output_file_str = argv[++argv_offset];
+
+  // Initialize Tesseract.
+  tesseract::TessBaseAPI api;
+  std::vector<std::string> vars_vec;
+  std::vector<std::string> vars_values;
+  vars_vec.emplace_back("output_ambig_words_file");
+  vars_values.emplace_back(output_file_str);
+  api.Init(tessdata_dir, lang.c_str(), tesseract::OEM_TESSERACT_ONLY, nullptr, 0, &vars_vec,
+           &vars_values, false);
+  tesseract::Dict &dict = api.tesseract()->getDict();
+  FILE *input_file = fopen(input_file_str, "rb");
+  if (input_file == nullptr) {
+    tesseract::tprintf("Failed to open input wordlist file %s\n", input_file_str);
+    return EXIT_FAILURE;
+  }
+  char str[CHARS_PER_LINE];
+
+  // Read word list and call Dict::NoDangerousAmbig() for each word
+  // to record ambiguities in the output file.
+  while (fgets(str, CHARS_PER_LINE, input_file) != nullptr) {
+    tesseract::chomp_string(str); // remove newline
+    tesseract::WERD_CHOICE word(str, dict.getUnicharset());
+    dict.NoDangerousAmbig(&word, nullptr, false, nullptr);
+  }
+  // Clean up.
+  fclose(input_file);
+  return EXIT_SUCCESS;
+}