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 #include "core/fpdfapi/edit/cpdf_flateencoder.h" 8 9 #include <memory> 10 11 #include "core/fpdfapi/parser/cpdf_name.h" 12 #include "core/fpdfapi/parser/cpdf_number.h" 13 #include "core/fpdfapi/parser/fpdf_parser_decode.h" 14 15 CPDF_FlateEncoder::CPDF_FlateEncoder(CPDF_Stream* pStream, bool bFlateEncode) 16 : m_dwSize(0), m_pAcc(pdfium::MakeRetain<CPDF_StreamAcc>(pStream)) { 17 m_pAcc->LoadAllDataRaw(); 18 19 bool bHasFilter = pStream && pStream->HasFilter(); 20 if (bHasFilter && !bFlateEncode) { 21 auto pDestAcc = pdfium::MakeRetain<CPDF_StreamAcc>(pStream); 22 pDestAcc->LoadAllDataFiltered(); 23 24 m_dwSize = pDestAcc->GetSize(); 25 m_pData = pDestAcc->DetachData(); 26 m_pDict = ToDictionary(pStream->GetDict()->Clone()); 27 m_pDict->RemoveFor("Filter"); 28 return; 29 } 30 if (bHasFilter || !bFlateEncode) { 31 m_pData = const_cast<uint8_t*>(m_pAcc->GetData()); 32 m_dwSize = m_pAcc->GetSize(); 33 m_pDict = pStream->GetDict(); 34 return; 35 } 36 37 // TODO(thestig): Move to Init() and check return value. 38 uint8_t* buffer = nullptr; 39 ::FlateEncode(m_pAcc->GetData(), m_pAcc->GetSize(), &buffer, &m_dwSize); 40 41 m_pData = std::unique_ptr<uint8_t, FxFreeDeleter>(buffer); 42 m_pDict = ToDictionary(pStream->GetDict()->Clone()); 43 m_pDict->SetNewFor<CPDF_Number>("Length", static_cast<int>(m_dwSize)); 44 m_pDict->SetNewFor<CPDF_Name>("Filter", "FlateDecode"); 45 m_pDict->RemoveFor("DecodeParms"); 46 } 47 48 CPDF_FlateEncoder::~CPDF_FlateEncoder() {} 49 50 void CPDF_FlateEncoder::CloneDict() { 51 if (m_pDict.IsOwned()) 52 return; 53 54 m_pDict = ToDictionary(m_pDict->Clone()); 55 ASSERT(m_pDict.IsOwned()); 56 } 57
