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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_PAGE_CPDF_STREAMPARSER_H_
#define CORE_FPDFAPI_PAGE_CPDF_STREAMPARSER_H_
#include <memory>
#include <utility>
#include "core/fpdfapi/parser/cpdf_dictionary.h"
#include "core/fpdfapi/parser/cpdf_document.h"
#include "core/fpdfapi/parser/cpdf_object.h"
#include "core/fpdfapi/parser/cpdf_stream.h"
#include "core/fxcrt/string_pool_template.h"
#include "core/fxcrt/weak_ptr.h"
#include "third_party/base/span.h"
class CPDF_StreamParser {
public:
enum SyntaxType { EndOfData, Number, Keyword, Name, Others };
explicit CPDF_StreamParser(pdfium::span<const uint8_t> span);
CPDF_StreamParser(pdfium::span<const uint8_t> span,
const WeakPtr<ByteStringPool>& pPool);
~CPDF_StreamParser();
SyntaxType ParseNextElement();
ByteStringView GetWord() const {
return ByteStringView(m_WordBuffer, m_WordSize);
}
uint32_t GetPos() const { return m_Pos; }
void SetPos(uint32_t pos) { m_Pos = pos; }
std::unique_ptr<CPDF_Object> GetObject() { return std::move(m_pLastObj); }
std::unique_ptr<CPDF_Object> ReadNextObject(bool bAllowNestedArray,
bool bInArray,
uint32_t dwRecursionLevel);
std::unique_ptr<CPDF_Stream> ReadInlineStream(
CPDF_Document* pDoc,
std::unique_ptr<CPDF_Dictionary> pDict,
CPDF_Object* pCSObj);
private:
friend class cpdf_streamparser_ReadHexString_Test;
static const uint32_t kMaxWordLength = 255;
void GetNextWord(bool& bIsNumber);
ByteString ReadString();
ByteString ReadHexString();
bool PositionIsInBounds() const;
uint32_t m_Pos = 0; // Current byte position within m_pBuf.
uint32_t m_WordSize = 0; // Current byte position within m_WordBuffer.
WeakPtr<ByteStringPool> m_pPool;
std::unique_ptr<CPDF_Object> m_pLastObj;
pdfium::span<const uint8_t> m_pBuf;
uint8_t m_WordBuffer[kMaxWordLength + 1]; // Include space for NUL.
};
#endif // CORE_FPDFAPI_PAGE_CPDF_STREAMPARSER_H_
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