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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/fpdfapi/parser/cpdf_stream_acc.h"
      8 
      9 #include "core/fpdfapi/parser/fpdf_parser_decode.h"
     10 
     11 CPDF_StreamAcc::CPDF_StreamAcc(const CPDF_Stream* pStream)
     12     : m_pStream(pStream) {}
     13 
     14 CPDF_StreamAcc::~CPDF_StreamAcc() {
     15   if (m_bNewBuf)
     16     FX_Free(m_pData);
     17   FX_Free(m_pSrcData);
     18 }
     19 
     20 void CPDF_StreamAcc::LoadAllData(bool bRawAccess,
     21                                  uint32_t estimated_size,
     22                                  bool bImageAcc) {
     23   if (!m_pStream)
     24     return;
     25 
     26   bool bProcessRawData = bRawAccess || !m_pStream->HasFilter();
     27   if (bProcessRawData && m_pStream->IsMemoryBased()) {
     28     m_dwSize = m_pStream->GetRawSize();
     29     m_pData = m_pStream->GetRawData();
     30     return;
     31   }
     32   uint32_t dwSrcSize = m_pStream->GetRawSize();
     33   if (dwSrcSize == 0)
     34     return;
     35 
     36   uint8_t* pSrcData;
     37   if (m_pStream->IsMemoryBased()) {
     38     pSrcData = m_pStream->GetRawData();
     39   } else {
     40     pSrcData = m_pSrcData = FX_Alloc(uint8_t, dwSrcSize);
     41     if (!m_pStream->ReadRawData(0, pSrcData, dwSrcSize))
     42       return;
     43   }
     44   if (bProcessRawData) {
     45     m_pData = pSrcData;
     46     m_dwSize = dwSrcSize;
     47   } else if (!PDF_DataDecode(pSrcData, dwSrcSize, m_pStream->GetDict(),
     48                              estimated_size, bImageAcc, &m_pData, &m_dwSize,
     49                              &m_ImageDecoder, &m_pImageParam)) {
     50     m_pData = pSrcData;
     51     m_dwSize = dwSrcSize;
     52   }
     53   if (pSrcData != m_pStream->GetRawData() && pSrcData != m_pData)
     54     FX_Free(pSrcData);
     55   m_pSrcData = nullptr;
     56   m_bNewBuf = m_pData != m_pStream->GetRawData();
     57 }
     58 
     59 void CPDF_StreamAcc::LoadAllDataFiltered() {
     60   LoadAllData(false, 0, false);
     61 }
     62 
     63 void CPDF_StreamAcc::LoadAllDataRaw() {
     64   LoadAllData(true, 0, false);
     65 }
     66 
     67 CPDF_Dictionary* CPDF_StreamAcc::GetDict() const {
     68   return m_pStream ? m_pStream->GetDict() : nullptr;
     69 }
     70 
     71 const uint8_t* CPDF_StreamAcc::GetData() const {
     72   return GetDataHelper();
     73 }
     74 
     75 uint8_t* CPDF_StreamAcc::GetData() {
     76   return GetDataHelper();
     77 }
     78 
     79 uint32_t CPDF_StreamAcc::GetSize() const {
     80   if (m_bNewBuf)
     81     return m_dwSize;
     82   return m_pStream ? m_pStream->GetRawSize() : 0;
     83 }
     84 
     85 std::unique_ptr<uint8_t, FxFreeDeleter> CPDF_StreamAcc::DetachData() {
     86   if (m_bNewBuf) {
     87     std::unique_ptr<uint8_t, FxFreeDeleter> p(m_pData);
     88     m_pData = nullptr;
     89     m_dwSize = 0;
     90     return p;
     91   }
     92   std::unique_ptr<uint8_t, FxFreeDeleter> p(FX_Alloc(uint8_t, m_dwSize));
     93   memcpy(p.get(), m_pData, m_dwSize);
     94   return p;
     95 }
     96 
     97 uint8_t* CPDF_StreamAcc::GetDataHelper() const {
     98   if (m_bNewBuf)
     99     return m_pData;
    100   return m_pStream ? m_pStream->GetRawData() : nullptr;
    101 }
    102