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/fxcrt/cfx_seekablemultistream.h" 8 9 #include <algorithm> 10 11 #include "core/fpdfapi/parser/cpdf_stream_acc.h" 12 #include "third_party/base/logging.h" 13 #include "third_party/base/stl_util.h" 14 15 CFX_SeekableMultiStream::CFX_SeekableMultiStream( 16 const std::vector<CPDF_Stream*>& streams) { 17 for (CPDF_Stream* pStream : streams) { 18 m_Data.push_back(pdfium::MakeRetain<CPDF_StreamAcc>(pStream)); 19 m_Data.back()->LoadAllDataFiltered(); 20 } 21 } 22 23 CFX_SeekableMultiStream::~CFX_SeekableMultiStream() {} 24 25 FX_FILESIZE CFX_SeekableMultiStream::GetSize() { 26 uint32_t dwSize = 0; 27 for (const auto& acc : m_Data) 28 dwSize += acc->GetSize(); 29 return dwSize; 30 } 31 32 bool CFX_SeekableMultiStream::ReadBlock(void* buffer, 33 FX_FILESIZE offset, 34 size_t size) { 35 int32_t iCount = pdfium::CollectionSize<int32_t>(m_Data); 36 int32_t index = 0; 37 while (index < iCount) { 38 const auto& acc = m_Data[index]; 39 FX_FILESIZE dwSize = acc->GetSize(); 40 if (offset < dwSize) 41 break; 42 43 offset -= dwSize; 44 index++; 45 } 46 while (index < iCount) { 47 const auto& acc = m_Data[index]; 48 uint32_t dwSize = acc->GetSize(); 49 size_t dwRead = std::min(size, static_cast<size_t>(dwSize - offset)); 50 memcpy(buffer, acc->GetData() + offset, dwRead); 51 size -= dwRead; 52 if (size == 0) 53 return true; 54 55 buffer = static_cast<uint8_t*>(buffer) + dwRead; 56 offset = 0; 57 index++; 58 } 59 return false; 60 } 61 62 size_t CFX_SeekableMultiStream::ReadBlock(void* buffer, size_t size) { 63 NOTREACHED(); 64 return 0; 65 } 66 67 FX_FILESIZE CFX_SeekableMultiStream::GetPosition() { 68 return 0; 69 } 70 71 bool CFX_SeekableMultiStream::IsEOF() { 72 return false; 73 } 74 75 bool CFX_SeekableMultiStream::Flush() { 76 NOTREACHED(); 77 return false; 78 } 79 80 bool CFX_SeekableMultiStream::WriteBlock(const void* pData, 81 FX_FILESIZE offset, 82 size_t size) { 83 NOTREACHED(); 84 return false; 85 } 86
