--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/thirdparty/tesseract/src/classify/adaptive.h	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,113 @@
+/******************************************************************************
+ ** Filename:   adaptive.h
+ ** Purpose:    Interface to adaptive matcher.
+ ** Author:     Dan Johnson
+ **
+ ** (c) Copyright Hewlett-Packard Company, 1988.
+ ** 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 ADAPTIVE_H
+#define ADAPTIVE_H
+
+#include "intproto.h"
+#include "oldlist.h"
+
+#include <cstdio>
+
+namespace tesseract {
+
+struct TEMP_PROTO_STRUCT {
+  uint16_t ProtoId;
+  PROTO_STRUCT Proto;
+};
+
+struct TEMP_CONFIG_STRUCT {
+  TEMP_CONFIG_STRUCT() = default;
+  TEMP_CONFIG_STRUCT(int MaxProtoId, int FontinfoId);
+  ~TEMP_CONFIG_STRUCT();
+  uint8_t NumTimesSeen;
+  uint8_t ProtoVectorSize;
+  PROTO_ID MaxProtoId;
+  BIT_VECTOR Protos;
+  int FontinfoId; // font information inferred from pre-trained templates
+};
+
+struct PERM_CONFIG_STRUCT {
+  PERM_CONFIG_STRUCT() = default;
+  ~PERM_CONFIG_STRUCT();
+  UNICHAR_ID *Ambigs;
+  int FontinfoId; // font information inferred from pre-trained templates
+};
+
+union ADAPTED_CONFIG {
+  TEMP_CONFIG_STRUCT *Temp;
+  PERM_CONFIG_STRUCT *Perm;
+};
+
+struct ADAPT_CLASS_STRUCT {
+  ADAPT_CLASS_STRUCT();
+  ~ADAPT_CLASS_STRUCT();
+  uint8_t NumPermConfigs;
+  uint8_t MaxNumTimesSeen; // maximum number of times any TEMP_CONFIG_STRUCT was seen
+                           // (cut at matcher_min_examples_for_prototyping)
+  BIT_VECTOR PermProtos;
+  BIT_VECTOR PermConfigs;
+  LIST TempProtos;
+  ADAPTED_CONFIG Config[MAX_NUM_CONFIGS];
+};
+
+class ADAPT_TEMPLATES_STRUCT {
+public:
+  ADAPT_TEMPLATES_STRUCT() = default;
+  ADAPT_TEMPLATES_STRUCT(UNICHARSET &unicharset);
+  ~ADAPT_TEMPLATES_STRUCT();
+  INT_TEMPLATES_STRUCT *Templates;
+  int NumNonEmptyClasses;
+  uint8_t NumPermClasses;
+  ADAPT_CLASS_STRUCT *Class[MAX_NUM_CLASSES];
+};
+
+/*----------------------------------------------------------------------------
+          Public Function Prototypes
+----------------------------------------------------------------------------*/
+#define NumNonEmptyClassesIn(Template) ((Template)->NumNonEmptyClasses)
+
+#define IsEmptyAdaptedClass(Class) ((Class)->NumPermConfigs == 0 && (Class)->TempProtos == NIL_LIST)
+
+#define ConfigIsPermanent(Class, ConfigId) (test_bit((Class)->PermConfigs, ConfigId))
+
+#define MakeConfigPermanent(Class, ConfigId) (SET_BIT((Class)->PermConfigs, ConfigId))
+
+#define MakeProtoPermanent(Class, ProtoId) (SET_BIT((Class)->PermProtos, ProtoId))
+
+#define TempConfigFor(Class, ConfigId) ((Class)->Config[ConfigId].Temp)
+
+#define PermConfigFor(Class, ConfigId) ((Class)->Config[ConfigId].Perm)
+
+#define IncreaseConfidence(TempConfig) ((TempConfig)->NumTimesSeen++)
+
+void AddAdaptedClass(ADAPT_TEMPLATES_STRUCT *Templates, ADAPT_CLASS_STRUCT *Class, CLASS_ID ClassId);
+
+ADAPT_CLASS_STRUCT *ReadAdaptedClass(tesseract::TFile *File);
+
+PERM_CONFIG_STRUCT *ReadPermConfig(tesseract::TFile *File);
+
+TEMP_CONFIG_STRUCT *ReadTempConfig(tesseract::TFile *File);
+
+void WriteAdaptedClass(FILE *File, ADAPT_CLASS_STRUCT *Class, int NumConfigs);
+
+void WritePermConfig(FILE *File, PERM_CONFIG_STRUCT *Config);
+
+void WriteTempConfig(FILE *File, TEMP_CONFIG_STRUCT *Config);
+
+} // namespace tesseract
+
+#endif