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// Copyright 2018 PDFium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CORE_FPDFAPI_PARSER_CPDF_CROSS_REF_TABLE_H_
#define CORE_FPDFAPI_PARSER_CPDF_CROSS_REF_TABLE_H_
#include <map>
#include <memory>
#include "core/fxcrt/fx_system.h"
class CPDF_Dictionary;
class CPDF_CrossRefTable {
public:
enum class ObjectType : uint8_t {
kFree = 0x00,
kNormal = 0x01,
kNotCompressed = kNormal,
kCompressed = 0x02,
kObjStream = 0xFF,
kNull = kObjStream,
};
struct ObjectInfo {
ObjectInfo() : pos(0), type(ObjectType::kFree), gennum(0) {}
// if type is ObjectType::kCompressed the archive_obj_num should be used.
// if type is ObjectType::kNotCompressed the pos should be used.
// In other cases its are unused.
union {
FX_FILESIZE pos;
uint32_t archive_obj_num;
};
ObjectType type;
uint16_t gennum;
};
// Merge cross reference tables. Apply top on current.
static std::unique_ptr<CPDF_CrossRefTable> MergeUp(
std::unique_ptr<CPDF_CrossRefTable> current,
std::unique_ptr<CPDF_CrossRefTable> top);
CPDF_CrossRefTable();
explicit CPDF_CrossRefTable(std::unique_ptr<CPDF_Dictionary> trailer);
~CPDF_CrossRefTable();
void AddCompressed(uint32_t obj_num, uint32_t archive_obj_num);
void AddNormal(uint32_t obj_num, uint16_t gen_num, FX_FILESIZE pos);
void SetFree(uint32_t obj_num);
const CPDF_Dictionary* trailer() const { return trailer_.get(); }
void SetTrailer(std::unique_ptr<CPDF_Dictionary> trailer);
const ObjectInfo* GetObjectInfo(uint32_t obj_num) const;
const std::map<uint32_t, ObjectInfo>& objects_info() const {
return objects_info_;
}
void Update(std::unique_ptr<CPDF_CrossRefTable> new_cross_ref);
void ShrinkObjectMap(uint32_t max_size);
// The total number of entries in the file’s cross-reference table, as
// defined by the combination of the original section and all update
// section.
uint32_t GetSize() const;
private:
void UpdateInfo(std::map<uint32_t, ObjectInfo>&& new_objects_info);
void UpdateTrailer(std::unique_ptr<CPDF_Dictionary> new_trailer);
std::unique_ptr<CPDF_Dictionary> trailer_;
std::map<uint32_t, ObjectInfo> objects_info_;
};
#endif // CORE_FPDFAPI_PARSER_CPDF_CROSS_REF_TABLE_H_
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