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// Copyright 2016 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/fpdfapi/parser/cpdf_stream_acc.h"
#include <utility>
#include "core/fpdfapi/parser/fpdf_parser_decode.h"
CPDF_StreamAcc::CPDF_StreamAcc(const CPDF_Stream* pStream)
: m_pStream(pStream) {}
CPDF_StreamAcc::~CPDF_StreamAcc() = default;
void CPDF_StreamAcc::LoadAllData(bool bRawAccess,
uint32_t estimated_size,
bool bImageAcc) {
if (bRawAccess) {
ASSERT(!estimated_size);
ASSERT(!bImageAcc);
}
if (!m_pStream)
return;
bool bProcessRawData = bRawAccess || !m_pStream->HasFilter();
if (bProcessRawData)
ProcessRawData();
else
ProcessFilteredData(estimated_size, bImageAcc);
}
void CPDF_StreamAcc::LoadAllDataFiltered() {
LoadAllData(false, 0, false);
}
void CPDF_StreamAcc::LoadAllDataFilteredWithEstimatedSize(
uint32_t estimated_size) {
LoadAllData(false, estimated_size, false);
}
void CPDF_StreamAcc::LoadAllDataImageAcc(uint32_t estimated_size) {
LoadAllData(false, estimated_size, true);
}
void CPDF_StreamAcc::LoadAllDataRaw() {
LoadAllData(true, 0, false);
}
const CPDF_Dictionary* CPDF_StreamAcc::GetDict() const {
return m_pStream ? m_pStream->GetDict() : nullptr;
}
uint8_t* CPDF_StreamAcc::GetData() const {
if (m_pData.IsOwned())
return m_pData.Get();
return m_pStream ? m_pStream->GetInMemoryRawData() : nullptr;
}
uint32_t CPDF_StreamAcc::GetSize() const {
if (m_pData.IsOwned())
return m_dwSize;
return (m_pStream && m_pStream->IsMemoryBased()) ? m_pStream->GetRawSize()
: 0;
}
std::unique_ptr<uint8_t, FxFreeDeleter> CPDF_StreamAcc::DetachData() {
if (m_pData.IsOwned()) {
std::unique_ptr<uint8_t, FxFreeDeleter> p = m_pData.ReleaseAndClear();
m_dwSize = 0;
return p;
}
std::unique_ptr<uint8_t, FxFreeDeleter> p(FX_Alloc(uint8_t, m_dwSize));
memcpy(p.get(), m_pData.Get(), m_dwSize);
return p;
}
void CPDF_StreamAcc::ProcessRawData() {
uint32_t dwSrcSize = m_pStream->GetRawSize();
if (dwSrcSize == 0)
return;
if (m_pStream->IsMemoryBased()) {
m_pData = m_pStream->GetInMemoryRawData();
m_dwSize = dwSrcSize;
return;
}
std::unique_ptr<uint8_t, FxFreeDeleter> pData = ReadRawStream();
if (!pData)
return;
m_pData = std::move(pData);
m_dwSize = dwSrcSize;
}
void CPDF_StreamAcc::ProcessFilteredData(uint32_t estimated_size,
bool bImageAcc) {
uint32_t dwSrcSize = m_pStream->GetRawSize();
if (dwSrcSize == 0)
return;
MaybeOwned<uint8_t, FxFreeDeleter> pSrcData;
if (m_pStream->IsMemoryBased()) {
pSrcData = m_pStream->GetInMemoryRawData();
} else {
std::unique_ptr<uint8_t, FxFreeDeleter> pTempSrcData = ReadRawStream();
if (!pTempSrcData)
return;
pSrcData = std::move(pTempSrcData);
}
uint8_t* pDecodedData = nullptr;
uint32_t dwDecodedSize = 0;
if (!PDF_DataDecode({pSrcData.Get(), dwSrcSize}, m_pStream->GetDict(),
estimated_size, bImageAcc, &pDecodedData, &dwDecodedSize,
&m_ImageDecoder, &m_pImageParam)) {
m_pData = std::move(pSrcData);
m_dwSize = dwSrcSize;
return;
}
if (!pDecodedData)
return;
if (pDecodedData == pSrcData.Get()) {
m_pData = std::move(pSrcData);
m_dwSize = dwSrcSize;
} else {
std::unique_ptr<uint8_t, FxFreeDeleter> p(pDecodedData);
m_pData = std::move(p);
m_dwSize = dwDecodedSize;
}
}
std::unique_ptr<uint8_t, FxFreeDeleter> CPDF_StreamAcc::ReadRawStream() const {
ASSERT(m_pStream);
ASSERT(!m_pStream->IsMemoryBased());
uint32_t dwSrcSize = m_pStream->GetRawSize();
ASSERT(dwSrcSize);
std::unique_ptr<uint8_t, FxFreeDeleter> pSrcData(
FX_Alloc(uint8_t, dwSrcSize));
if (!m_pStream->ReadRawData(0, pSrcData.get(), dwSrcSize))
return nullptr;
return pSrcData;
}
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