--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/thirdparty/tesseract/src/ccutil/unicharmap.cpp	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,135 @@
+///////////////////////////////////////////////////////////////////////
+// File:        unicharmap.cpp
+// Description: Unicode character/ligature to integer id class.
+// Author:      Thomas Kielbus
+//
+// (C) Copyright 2006, 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 "unicharmap.h"
+
+#include <tesseract/unichar.h>
+
+#include <cassert>
+
+namespace tesseract {
+
+UNICHARMAP::UNICHARMAP() : nodes(nullptr) {}
+
+UNICHARMAP::~UNICHARMAP() {
+  delete[] nodes;
+}
+
+// Search the given unichar representation in the tree, using length characters
+// from it maximum. Each character in the string is interpreted as an index in
+// an array of nodes.
+UNICHAR_ID UNICHARMAP::unichar_to_id(const char *const unichar_repr, int length) const {
+  UNICHARMAP_NODE *current_nodes = nodes;
+
+  assert(*unichar_repr != '\0');
+  assert(length > 0 && length <= UNICHAR_LEN);
+
+  int index = 0;
+  if (length <= 0 || unichar_repr[index] == '\0') {
+    return INVALID_UNICHAR_ID;
+  }
+  do {
+    if (index + 1 >= length || unichar_repr[index + 1] == '\0') {
+      return current_nodes[static_cast<unsigned char>(unichar_repr[index])].id;
+    }
+    current_nodes = current_nodes[static_cast<unsigned char>(unichar_repr[index])].children;
+    ++index;
+  } while (true);
+}
+
+// Search the given unichar representation in the tree, creating the possibly
+// missing nodes. Once the right place has been found, insert the given id and
+// update the inserted flag to keep track of the insert. Each character in the
+// string is interpreted as an index in an array of nodes.
+void UNICHARMAP::insert(const char *const unichar_repr, UNICHAR_ID id) {
+  const char *current_char = unichar_repr;
+  if (*current_char == '\0') {
+    return;
+  }
+  UNICHARMAP_NODE **current_nodes_pointer = &nodes;
+  do {
+    if (*current_nodes_pointer == nullptr) {
+      *current_nodes_pointer = new UNICHARMAP_NODE[256];
+    }
+    if (current_char[1] == '\0') {
+      (*current_nodes_pointer)[static_cast<unsigned char>(*current_char)].id = id;
+      return;
+    }
+    current_nodes_pointer =
+        &((*current_nodes_pointer)[static_cast<unsigned char>(*current_char)].children);
+    ++current_char;
+  } while (true);
+}
+
+// Search the given unichar representation in the tree, using length characters
+// from it maximum. Each character in the string is interpreted as an index in
+// an array of nodes. Stop once the tree does not have anymore nodes or once we
+// found the right unichar_repr.
+bool UNICHARMAP::contains(const char *const unichar_repr, int length) const {
+  if (unichar_repr == nullptr || *unichar_repr == '\0') {
+    return false;
+  }
+  if (length <= 0 || length > UNICHAR_LEN) {
+    return false;
+  }
+  int index = 0;
+  if (unichar_repr[index] == '\0') {
+    return false;
+  }
+  UNICHARMAP_NODE *current_nodes = nodes;
+
+  while (current_nodes != nullptr && index + 1 < length && unichar_repr[index + 1] != '\0') {
+    current_nodes = current_nodes[static_cast<unsigned char>(unichar_repr[index])].children;
+    ++index;
+  }
+  return current_nodes != nullptr && (index + 1 >= length || unichar_repr[index + 1] == '\0') &&
+         current_nodes[static_cast<unsigned char>(unichar_repr[index])].id >= 0;
+}
+
+// Return the minimum number of characters that must be used from this string
+// to obtain a match in the UNICHARMAP.
+int UNICHARMAP::minmatch(const char *const unichar_repr) const {
+  const char *current_char = unichar_repr;
+  if (*current_char == '\0') {
+    return 0;
+  }
+  UNICHARMAP_NODE *current_nodes = nodes;
+
+  while (current_nodes != nullptr && *current_char != '\0') {
+    if (current_nodes[static_cast<unsigned char>(*current_char)].id >= 0) {
+      return current_char + 1 - unichar_repr;
+    }
+    current_nodes = current_nodes[static_cast<unsigned char>(*current_char)].children;
+    ++current_char;
+  }
+  return 0;
+}
+
+void UNICHARMAP::clear() {
+  delete[] nodes;
+  nodes = nullptr;
+}
+
+UNICHARMAP::UNICHARMAP_NODE::UNICHARMAP_NODE() : children(nullptr), id(-1) {}
+
+// Recursively delete the children
+UNICHARMAP::UNICHARMAP_NODE::~UNICHARMAP_NODE() {
+  delete[] children;
+}
+
+} // namespace tesseract