1 // Copyright 2017 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_FLATEENCODER_H_ 8 #define CORE_FPDFAPI_PARSER_CPDF_FLATEENCODER_H_ 9 10 #include "core/fxcrt/fx_memory_wrappers.h" 11 #include "core/fxcrt/maybe_owned.h" 12 #include "core/fxcrt/retain_ptr.h" 13 #include "third_party/base/span.h" 14 15 class CPDF_Dictionary; 16 class CPDF_Stream; 17 class CPDF_StreamAcc; 18 19 class CPDF_FlateEncoder { 20 public: 21 CPDF_FlateEncoder(const CPDF_Stream* pStream, bool bFlateEncode); 22 ~CPDF_FlateEncoder(); 23 24 void CloneDict(); 25 CPDF_Dictionary* GetClonedDict(); 26 27 // Returns |m_pClonedDict| if it is valid. Otherwise returns |m_pDict|. 28 const CPDF_Dictionary* GetDict() const; 29 GetSpan()30 pdfium::span<const uint8_t> GetSpan() const { 31 return pdfium::make_span(m_pData.Get(), m_dwSize); 32 } 33 34 private: 35 RetainPtr<CPDF_StreamAcc> m_pAcc; 36 37 uint32_t m_dwSize; 38 MaybeOwned<uint8_t, FxFreeDeleter> m_pData; 39 40 // Only one of these two pointers is valid at any time. 41 RetainPtr<const CPDF_Dictionary> m_pDict; 42 RetainPtr<CPDF_Dictionary> m_pClonedDict; 43 }; 44 45 #endif // CORE_FPDFAPI_PARSER_CPDF_FLATEENCODER_H_ 46