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// 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();
return 0;
}
FX_FILESIZE CPDF_SeekableMultiStream::GetPosition() {
return 0;
}
bool CPDF_SeekableMultiStream::IsEOF() {
return false;
}
bool CPDF_SeekableMultiStream::Flush() {
NOTREACHED();
return false;
}
bool CPDF_SeekableMultiStream::WriteBlockAtOffset(
pdfium::span<const uint8_t> buffer,
FX_FILESIZE offset) {
NOTREACHED();
return false;
}
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