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// Copyright 2017 PDFium Authors. All rights reserved.
// 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/fxcrt/cfx_seekablemultistream.h"
#include <algorithm>
#include "core/fpdfapi/parser/cpdf_stream_acc.h"
#include "third_party/base/logging.h"
#include "third_party/base/stl_util.h"
CFX_SeekableMultiStream::CFX_SeekableMultiStream(
const std::vector<const CPDF_Stream*>& streams) {
for (const CPDF_Stream* pStream : streams) {
m_Data.push_back(pdfium::MakeRetain<CPDF_StreamAcc>(pStream));
m_Data.back()->LoadAllDataFiltered();
}
}
CFX_SeekableMultiStream::~CFX_SeekableMultiStream() {}
FX_FILESIZE CFX_SeekableMultiStream::GetSize() {
uint32_t dwSize = 0;
for (const auto& acc : m_Data)
dwSize += acc->GetSize();
return dwSize;
}
bool CFX_SeekableMultiStream::ReadBlock(void* buffer,
FX_FILESIZE offset,
size_t size) {
int32_t iCount = pdfium::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) {
const auto& acc = m_Data[index];
uint32_t dwSize = acc->GetSize();
size_t dwRead = std::min(size, static_cast<size_t>(dwSize - offset));
memcpy(buffer, acc->GetData() + offset, dwRead);
size -= dwRead;
if (size == 0)
return true;
buffer = static_cast<uint8_t*>(buffer) + dwRead;
offset = 0;
index++;
}
return false;
}
size_t CFX_SeekableMultiStream::ReadBlock(void* buffer, size_t size) {
NOTREACHED();
return 0;
}
FX_FILESIZE CFX_SeekableMultiStream::GetPosition() {
return 0;
}
bool CFX_SeekableMultiStream::IsEOF() {
return false;
}
bool CFX_SeekableMultiStream::Flush() {
NOTREACHED();
return false;
}
bool CFX_SeekableMultiStream::WriteBlock(const void* pData,
FX_FILESIZE offset,
size_t size) {
NOTREACHED();
return false;
}
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