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
GetRawSize()39 uint32_t GetRawSize() const { return m_dwSize; }
GetRawData()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
IsMemoryBased()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
ToStream(CPDF_Object * obj)76 inline CPDF_Stream* ToStream(CPDF_Object* obj) {
77 return obj ? obj->AsStream() : nullptr;
78 }
79
ToStream(const CPDF_Object * obj)80 inline const CPDF_Stream* ToStream(const CPDF_Object* obj) {
81 return obj ? obj->AsStream() : nullptr;
82 }
83
ToStream(std::unique_ptr<CPDF_Object> obj)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