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// Copyright 2016 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.
// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
#ifndef CORE_FPDFAPI_PARSER_CPDF_INDIRECT_OBJECT_HOLDER_H_
#define CORE_FPDFAPI_PARSER_CPDF_INDIRECT_OBJECT_HOLDER_H_
#include <map>
#include <memory>
#include <type_traits>
#include <vector>
#include "core/fpdfapi/parser/cpdf_object.h"
#include "core/fxcrt/cfx_string_pool_template.h"
#include "core/fxcrt/cfx_weak_ptr.h"
#include "core/fxcrt/fx_system.h"
#include "third_party/base/ptr_util.h"
class CPDF_IndirectObjectHolder {
public:
using const_iterator =
std::map<uint32_t, std::unique_ptr<CPDF_Object>>::const_iterator;
CPDF_IndirectObjectHolder();
virtual ~CPDF_IndirectObjectHolder();
CPDF_Object* GetIndirectObject(uint32_t objnum) const;
CPDF_Object* GetOrParseIndirectObject(uint32_t objnum);
void DeleteIndirectObject(uint32_t objnum);
// Creates and adds a new object owned by the indirect object holder,
// and returns an unowned pointer to it. We have a special case to
// handle objects that can intern strings from our ByteStringPool.
template <typename T, typename... Args>
typename std::enable_if<!CanInternStrings<T>::value, T*>::type NewIndirect(
Args... args) {
return static_cast<T*>(AddIndirectObject(pdfium::MakeUnique<T>(args...)));
}
template <typename T, typename... Args>
typename std::enable_if<CanInternStrings<T>::value, T*>::type NewIndirect(
Args... args) {
return static_cast<T*>(
AddIndirectObject(pdfium::MakeUnique<T>(m_pByteStringPool, args...)));
}
// Takes ownership of |pObj|, returns unowned pointer to it.
CPDF_Object* AddIndirectObject(std::unique_ptr<CPDF_Object> pObj);
// Always takes ownership of |pObj|, return true if higher generation number.
bool ReplaceIndirectObjectIfHigherGeneration(
uint32_t objnum,
std::unique_ptr<CPDF_Object> pObj);
// Takes ownership of |pObj|, persist it for life of the indirect object
// holder (typically so that unowned pointers to it remain valid). No-op
// if |pObj| is NULL.
void AddOrphan(std::unique_ptr<CPDF_Object> pObj);
uint32_t GetLastObjNum() const { return m_LastObjNum; }
void SetLastObjNum(uint32_t objnum) { m_LastObjNum = objnum; }
CFX_WeakPtr<CFX_ByteStringPool> GetByteStringPool() const {
return m_pByteStringPool;
}
const_iterator begin() const { return m_IndirectObjs.begin(); }
const_iterator end() const { return m_IndirectObjs.end(); }
protected:
virtual std::unique_ptr<CPDF_Object> ParseIndirectObject(uint32_t objnum);
private:
uint32_t m_LastObjNum;
std::map<uint32_t, std::unique_ptr<CPDF_Object>> m_IndirectObjs;
std::vector<std::unique_ptr<CPDF_Object>> m_OrphanObjs;
CFX_WeakPtr<CFX_ByteStringPool> m_pByteStringPool;
};
#endif // CORE_FPDFAPI_PARSER_CPDF_INDIRECT_OBJECT_HOLDER_H_
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