blob: 304f5d7dfbe173f8447862424944badcb3bf06da [file] [log] [blame]
// 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.
#include <stdint.h>
#include <map>
#include <memory>
#include "core/fxcrt/fx_types.h"
#include "core/fxcrt/retain_ptr.h"
class CPDF_Dictionary;
class CPDF_CrossRefTable {
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`, `archive` should be used.
// If `type` is `ObjectType::kNotCompressed`, `pos` should be used.
// In other cases, it is unused.
union {
struct {
uint32_t obj_num;
uint32_t obj_index;
} archive;
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);
explicit CPDF_CrossRefTable(RetainPtr<CPDF_Dictionary> trailer);
void AddCompressed(uint32_t obj_num,
uint32_t archive_obj_num,
uint32_t archive_obj_index);
void AddNormal(uint32_t obj_num, uint16_t gen_num, FX_FILESIZE pos);
void SetFree(uint32_t obj_num);
void SetTrailer(RetainPtr<CPDF_Dictionary> trailer);
const CPDF_Dictionary* trailer() const { return trailer_.Get(); }
CPDF_Dictionary* GetMutableTrailerForTesting() { return trailer_.Get(); }
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 objnum);
void UpdateInfo(std::map<uint32_t, ObjectInfo>&& new_objects_info);
void UpdateTrailer(RetainPtr<CPDF_Dictionary> new_trailer);
RetainPtr<CPDF_Dictionary> trailer_;
std::map<uint32_t, ObjectInfo> objects_info_;