--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/thirdparty/tesseract/src/training/unicharset/fileio.h	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,112 @@
+/**********************************************************************
+ * File:        fileio.h
+ * Description: File I/O utilities.
+ * Author:      Samuel Charron
+ *
+ * (C) Copyright 2013, 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.
+ *
+ **********************************************************************/
+#ifndef TESSERACT_TRAINING_FILEIO_H_
+#define TESSERACT_TRAINING_FILEIO_H_
+
+#include "export.h"
+#include "helpers.h"  // for split
+#include "serialis.h" // for LoadDataFromFile
+
+#include <tesseract/export.h>
+
+#include <cstddef>
+#include <cstdio>
+#include <string>
+
+namespace tesseract {
+
+// Reads a file as a vector of string.
+inline bool LoadFileLinesToStrings(const char *filename, std::vector<std::string> *lines) {
+  std::vector<char> data;
+  if (!LoadDataFromFile(filename, &data)) {
+    return false;
+  }
+  // TODO: optimize.
+  std::string lines_str(&data[0], data.size());
+  *lines = split(lines_str, '\n');
+  return true;
+}
+
+// A class to manipulate FILE*s.
+class TESS_UNICHARSET_TRAINING_API File {
+public:
+  // Try to open the file 'filename' in mode 'mode'.
+  // Stop the program if it cannot open it.
+  static FILE *OpenOrDie(const std::string &filename, const std::string &mode);
+  static FILE *Open(const std::string &filename, const std::string &mode);
+
+  // Try to open the file 'filename' and to write 'str' in it.
+  // Stop the program if it fails.
+  static void WriteStringToFileOrDie(const std::string &str, const std::string &filename);
+
+  // Return true if the file 'filename' is readable.
+  static bool Readable(const std::string &filename);
+
+  static bool ReadFileToString(const std::string &filename, std::string *out);
+
+  // Helper methods
+
+  // Concatenate file paths removing any extra intervening '/' symbols.
+  static std::string JoinPath(const std::string &prefix, const std::string &suffix);
+  // Delete a filename or all filenames matching a glob pattern.
+  static bool Delete(const char *pathname);
+  static bool DeleteMatchingFiles(const char *pattern);
+};
+
+// A class to manipulate Files for reading.
+class TESS_UNICHARSET_TRAINING_API InputBuffer {
+public:
+  explicit InputBuffer(FILE *stream);
+  // 'size' is ignored.
+  InputBuffer(FILE *stream, size_t size);
+
+  ~InputBuffer();
+
+  // Read data until end-of-file.
+  // The data is stored in '*out'.
+  // Return false if an error occurs, true otherwise.
+  bool Read(std::string *out);
+
+  // Close the FILE* used by InputBuffer.
+  // Return false if an error occurs, true otherwise.
+  bool CloseFile();
+
+private:
+  FILE *stream_;
+};
+
+// A class to manipulate Files for writing.
+class TESS_UNICHARSET_TRAINING_API OutputBuffer {
+public:
+  explicit OutputBuffer(FILE *stream);
+  // 'size' is ignored.
+  OutputBuffer(FILE *stream, size_t size);
+
+  ~OutputBuffer();
+
+  // Write string 'str' to the open FILE*.
+  void WriteString(const std::string &str);
+
+  // Close the FILE* used by InputBuffer.
+  // Return false if an error occurs, true otherwise.
+  bool CloseFile();
+
+private:
+  FILE *stream_;
+};
+
+} // namespace tesseract
+#endif // TESSERACT_TRAINING_FILEIO_H_