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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 #include "core/include/fpdfapi/cpdf_stream_acc.h" |
| 8 |
| 9 #include "core/include/fpdfapi/cpdf_dictionary.h" |
| 10 #include "core/include/fpdfapi/fpdf_parser_decode.h" |
| 11 |
| 12 CPDF_StreamAcc::CPDF_StreamAcc() |
| 13 : m_pData(nullptr), |
| 14 m_dwSize(0), |
| 15 m_bNewBuf(FALSE), |
| 16 m_pImageParam(nullptr), |
| 17 m_pStream(nullptr), |
| 18 m_pSrcData(nullptr) {} |
| 19 |
| 20 void CPDF_StreamAcc::LoadAllData(const CPDF_Stream* pStream, |
| 21 FX_BOOL bRawAccess, |
| 22 FX_DWORD estimated_size, |
| 23 FX_BOOL bImageAcc) { |
| 24 if (!pStream) |
| 25 return; |
| 26 |
| 27 m_pStream = pStream; |
| 28 if (pStream->IsMemoryBased() && |
| 29 (!pStream->GetDict()->KeyExist("Filter") || bRawAccess)) { |
| 30 m_dwSize = pStream->GetRawSize(); |
| 31 m_pData = pStream->GetRawData(); |
| 32 return; |
| 33 } |
| 34 uint8_t* pSrcData; |
| 35 FX_DWORD dwSrcSize = pStream->GetRawSize(); |
| 36 if (dwSrcSize == 0) |
| 37 return; |
| 38 |
| 39 if (!pStream->IsMemoryBased()) { |
| 40 pSrcData = m_pSrcData = FX_Alloc(uint8_t, dwSrcSize); |
| 41 if (!pStream->ReadRawData(0, pSrcData, dwSrcSize)) |
| 42 return; |
| 43 } else { |
| 44 pSrcData = pStream->GetRawData(); |
| 45 } |
| 46 uint8_t* pDecryptedData = pSrcData; |
| 47 FX_DWORD dwDecryptedSize = dwSrcSize; |
| 48 if (!pStream->GetDict()->KeyExist("Filter") || bRawAccess) { |
| 49 m_pData = pDecryptedData; |
| 50 m_dwSize = dwDecryptedSize; |
| 51 } else { |
| 52 FX_BOOL bRet = PDF_DataDecode( |
| 53 pDecryptedData, dwDecryptedSize, m_pStream->GetDict(), m_pData, |
| 54 m_dwSize, m_ImageDecoder, m_pImageParam, estimated_size, bImageAcc); |
| 55 if (!bRet) { |
| 56 m_pData = pDecryptedData; |
| 57 m_dwSize = dwDecryptedSize; |
| 58 } |
| 59 } |
| 60 if (pSrcData != pStream->GetRawData() && pSrcData != m_pData) { |
| 61 FX_Free(pSrcData); |
| 62 } |
| 63 if (pDecryptedData != pSrcData && pDecryptedData != m_pData) { |
| 64 FX_Free(pDecryptedData); |
| 65 } |
| 66 m_pSrcData = nullptr; |
| 67 m_bNewBuf = m_pData != pStream->GetRawData(); |
| 68 } |
| 69 |
| 70 CPDF_StreamAcc::~CPDF_StreamAcc() { |
| 71 if (m_bNewBuf) { |
| 72 FX_Free(m_pData); |
| 73 } |
| 74 FX_Free(m_pSrcData); |
| 75 } |
| 76 |
| 77 const uint8_t* CPDF_StreamAcc::GetData() const { |
| 78 if (m_bNewBuf) { |
| 79 return m_pData; |
| 80 } |
| 81 if (!m_pStream) { |
| 82 return nullptr; |
| 83 } |
| 84 return m_pStream->GetRawData(); |
| 85 } |
| 86 |
| 87 FX_DWORD CPDF_StreamAcc::GetSize() const { |
| 88 if (m_bNewBuf) { |
| 89 return m_dwSize; |
| 90 } |
| 91 if (!m_pStream) { |
| 92 return 0; |
| 93 } |
| 94 return m_pStream->GetRawSize(); |
| 95 } |
| 96 |
| 97 uint8_t* CPDF_StreamAcc::DetachData() { |
| 98 if (m_bNewBuf) { |
| 99 uint8_t* p = m_pData; |
| 100 m_pData = nullptr; |
| 101 m_dwSize = 0; |
| 102 return p; |
| 103 } |
| 104 uint8_t* p = FX_Alloc(uint8_t, m_dwSize); |
| 105 FXSYS_memcpy(p, m_pData, m_dwSize); |
| 106 return p; |
| 107 } |
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