| // Copyright 2017 The PDFium Authors |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com |
| |
| #include "core/fpdfapi/parser/cpdf_seekablemultistream.h" |
| |
| #include <algorithm> |
| #include <utility> |
| |
| #include "core/fpdfapi/parser/cpdf_stream.h" |
| #include "core/fpdfapi/parser/cpdf_stream_acc.h" |
| #include "core/fxcrt/fx_safe_types.h" |
| #include "core/fxcrt/span_util.h" |
| #include "core/fxcrt/stl_util.h" |
| #include "third_party/base/notreached.h" |
| |
| CPDF_SeekableMultiStream::CPDF_SeekableMultiStream( |
| std::vector<RetainPtr<const CPDF_Stream>> streams) { |
| for (auto& pStream : streams) { |
| m_Data.push_back(pdfium::MakeRetain<CPDF_StreamAcc>(std::move(pStream))); |
| m_Data.back()->LoadAllDataFiltered(); |
| } |
| } |
| |
| CPDF_SeekableMultiStream::~CPDF_SeekableMultiStream() = default; |
| |
| FX_FILESIZE CPDF_SeekableMultiStream::GetSize() { |
| FX_SAFE_FILESIZE dwSize = 0; |
| for (const auto& acc : m_Data) |
| dwSize += acc->GetSize(); |
| return dwSize.ValueOrDie(); |
| } |
| |
| bool CPDF_SeekableMultiStream::ReadBlockAtOffset(pdfium::span<uint8_t> buffer, |
| FX_FILESIZE offset) { |
| int32_t iCount = fxcrt::CollectionSize<int32_t>(m_Data); |
| int32_t index = 0; |
| while (index < iCount) { |
| const auto& acc = m_Data[index]; |
| FX_FILESIZE dwSize = acc->GetSize(); |
| if (offset < dwSize) |
| break; |
| |
| offset -= dwSize; |
| index++; |
| } |
| while (index < iCount) { |
| auto acc_span = m_Data[index]->GetSpan(); |
| size_t dwRead = std::min<size_t>(buffer.size(), acc_span.size() - offset); |
| fxcrt::spancpy(buffer, acc_span.subspan(offset, dwRead)); |
| buffer = buffer.subspan(dwRead); |
| if (buffer.empty()) |
| return true; |
| |
| offset = 0; |
| index++; |
| } |
| return false; |
| } |
| |
| size_t CPDF_SeekableMultiStream::ReadBlock(pdfium::span<uint8_t> buffer) { |
| NOTREACHED_NORETURN(); |
| } |
| |
| FX_FILESIZE CPDF_SeekableMultiStream::GetPosition() { |
| return 0; |
| } |
| |
| bool CPDF_SeekableMultiStream::IsEOF() { |
| return false; |
| } |
| |
| bool CPDF_SeekableMultiStream::Flush() { |
| NOTREACHED_NORETURN(); |
| } |
| |
| bool CPDF_SeekableMultiStream::WriteBlockAtOffset( |
| pdfium::span<const uint8_t> buffer, |
| FX_FILESIZE offset) { |
| NOTREACHED_NORETURN(); |
| } |