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      1 // Copyright 2016 PDFium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
      6 
      7 #ifndef CORE_FPDFAPI_PARSER_CPDF_STREAM_H_
      8 #define CORE_FPDFAPI_PARSER_CPDF_STREAM_H_
      9 
     10 #include <memory>
     11 #include <set>
     12 #include <sstream>
     13 
     14 #include "core/fpdfapi/parser/cpdf_dictionary.h"
     15 #include "core/fpdfapi/parser/cpdf_object.h"
     16 #include "core/fxcrt/fx_stream.h"
     17 
     18 class CPDF_Stream : public CPDF_Object {
     19  public:
     20   CPDF_Stream();
     21 
     22   // Takes ownership of |pData|.
     23   CPDF_Stream(std::unique_ptr<uint8_t, FxFreeDeleter> pData,
     24               uint32_t size,
     25               std::unique_ptr<CPDF_Dictionary> pDict);
     26 
     27   ~CPDF_Stream() override;
     28 
     29   // CPDF_Object:
     30   Type GetType() const override;
     31   std::unique_ptr<CPDF_Object> Clone() const override;
     32   CPDF_Dictionary* GetDict() const override;
     33   WideString GetUnicodeText() const override;
     34   bool IsStream() const override;
     35   CPDF_Stream* AsStream() override;
     36   const CPDF_Stream* AsStream() const override;
     37   bool WriteTo(IFX_ArchiveStream* archive) const override;
     38 
     39   uint32_t GetRawSize() const { return m_dwSize; }
     40   uint8_t* GetRawData() const { return m_pDataBuf.get(); }
     41 
     42   // Does not takes ownership of |pData|, copies into internally-owned buffer.
     43   void SetData(const uint8_t* pData, uint32_t size);
     44   void SetData(std::unique_ptr<uint8_t, FxFreeDeleter> pData, uint32_t size);
     45   void SetData(std::ostringstream* stream);
     46   // Set data and remove "Filter" and "DecodeParms" fields from stream
     47   // dictionary.
     48   void SetDataAndRemoveFilter(const uint8_t* pData, uint32_t size);
     49   void SetDataAndRemoveFilter(std::ostringstream* stream);
     50 
     51   void InitStream(const uint8_t* pData,
     52                   uint32_t size,
     53                   std::unique_ptr<CPDF_Dictionary> pDict);
     54   void InitStreamFromFile(const RetainPtr<IFX_SeekableReadStream>& pFile,
     55                           std::unique_ptr<CPDF_Dictionary> pDict);
     56 
     57   bool ReadRawData(FX_FILESIZE start_pos,
     58                    uint8_t* pBuf,
     59                    uint32_t buf_size) const;
     60 
     61   bool IsMemoryBased() const { return m_bMemoryBased; }
     62   bool HasFilter() const;
     63 
     64  protected:
     65   std::unique_ptr<CPDF_Object> CloneNonCyclic(
     66       bool bDirect,
     67       std::set<const CPDF_Object*>* pVisited) const override;
     68 
     69   bool m_bMemoryBased = true;
     70   uint32_t m_dwSize = 0;
     71   std::unique_ptr<CPDF_Dictionary> m_pDict;
     72   std::unique_ptr<uint8_t, FxFreeDeleter> m_pDataBuf;
     73   RetainPtr<IFX_SeekableReadStream> m_pFile;
     74 };
     75 
     76 inline CPDF_Stream* ToStream(CPDF_Object* obj) {
     77   return obj ? obj->AsStream() : nullptr;
     78 }
     79 
     80 inline const CPDF_Stream* ToStream(const CPDF_Object* obj) {
     81   return obj ? obj->AsStream() : nullptr;
     82 }
     83 
     84 inline std::unique_ptr<CPDF_Stream> ToStream(std::unique_ptr<CPDF_Object> obj) {
     85   CPDF_Stream* pStream = ToStream(obj.get());
     86   if (!pStream)
     87     return nullptr;
     88   obj.release();
     89   return std::unique_ptr<CPDF_Stream>(pStream);
     90 }
     91 
     92 #endif  // CORE_FPDFAPI_PARSER_CPDF_STREAM_H_
     93