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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.h"
#include <utility>
#include <vector>
#include "constants/stream_dict_common.h"
#include "core/fpdfapi/edit/cpdf_encryptor.h"
#include "core/fpdfapi/edit/cpdf_flateencoder.h"
#include "core/fpdfapi/parser/cpdf_dictionary.h"
#include "core/fpdfapi/parser/cpdf_number.h"
#include "core/fpdfapi/parser/cpdf_stream_acc.h"
#include "core/fpdfapi/parser/fpdf_parser_decode.h"
#include "core/fxcrt/fx_stream.h"
#include "third_party/base/numerics/safe_conversions.h"
#include "third_party/base/ptr_util.h"
#include "third_party/base/stl_util.h"
namespace {
bool IsMetaDataStreamDictionary(const CPDF_Dictionary* dict) {
return dict && dict->GetStringFor("Type") == "Metadata" &&
dict->GetStringFor("Subtype") == "XML";
}
} // namespace
CPDF_Stream::CPDF_Stream() {}
CPDF_Stream::CPDF_Stream(std::unique_ptr<uint8_t, FxFreeDeleter> pData,
uint32_t size,
std::unique_ptr<CPDF_Dictionary> pDict)
: m_pDict(std::move(pDict)) {
SetData(std::move(pData), size);
}
CPDF_Stream::~CPDF_Stream() {
m_ObjNum = kInvalidObjNum;
if (m_pDict && m_pDict->GetObjNum() == kInvalidObjNum)
m_pDict.release(); // lowercase release, release ownership.
}
CPDF_Object::Type CPDF_Stream::GetType() const {
return STREAM;
}
CPDF_Dictionary* CPDF_Stream::GetDict() {
return m_pDict.get();
}
const CPDF_Dictionary* CPDF_Stream::GetDict() const {
return m_pDict.get();
}
bool CPDF_Stream::IsStream() const {
return true;
}
CPDF_Stream* CPDF_Stream::AsStream() {
return this;
}
const CPDF_Stream* CPDF_Stream::AsStream() const {
return this;
}
void CPDF_Stream::InitStream(pdfium::span<const uint8_t> pData,
std::unique_ptr<CPDF_Dictionary> pDict) {
m_pDict = std::move(pDict);
SetData(pData);
}
void CPDF_Stream::InitStreamFromFile(
const RetainPtr<IFX_SeekableReadStream>& pFile,
std::unique_ptr<CPDF_Dictionary> pDict) {
m_pDict = std::move(pDict);
m_bMemoryBased = false;
m_pDataBuf.reset();
m_pFile = pFile;
m_dwSize = pdfium::base::checked_cast<uint32_t>(pFile->GetSize());
if (m_pDict)
m_pDict->SetNewFor<CPDF_Number>("Length", static_cast<int>(m_dwSize));
}
std::unique_ptr<CPDF_Object> CPDF_Stream::Clone() const {
return CloneObjectNonCyclic(false);
}
std::unique_ptr<CPDF_Object> CPDF_Stream::CloneNonCyclic(
bool bDirect,
std::set<const CPDF_Object*>* pVisited) const {
pVisited->insert(this);
auto pAcc = pdfium::MakeRetain<CPDF_StreamAcc>(this);
pAcc->LoadAllDataRaw();
uint32_t streamSize = pAcc->GetSize();
const CPDF_Dictionary* pDict = GetDict();
std::unique_ptr<CPDF_Dictionary> pNewDict;
if (pDict && !pdfium::ContainsKey(*pVisited, pDict)) {
pNewDict =
ToDictionary(static_cast<const CPDF_Object*>(pDict)->CloneNonCyclic(
bDirect, pVisited));
}
return pdfium::MakeUnique<CPDF_Stream>(pAcc->DetachData(), streamSize,
std::move(pNewDict));
}
void CPDF_Stream::SetDataAndRemoveFilter(pdfium::span<const uint8_t> pData) {
SetData(pData);
m_pDict->RemoveFor("Filter");
m_pDict->RemoveFor(pdfium::stream::kDecodeParms);
}
void CPDF_Stream::SetDataFromStringstreamAndRemoveFilter(
std::ostringstream* stream) {
if (stream->tellp() <= 0) {
SetDataAndRemoveFilter({});
return;
}
SetDataAndRemoveFilter(
{reinterpret_cast<const uint8_t*>(stream->str().c_str()),
static_cast<size_t>(stream->tellp())});
}
void CPDF_Stream::SetData(pdfium::span<const uint8_t> pData) {
std::unique_ptr<uint8_t, FxFreeDeleter> data_copy;
if (!pData.empty()) {
data_copy.reset(FX_Alloc(uint8_t, pData.size()));
memcpy(data_copy.get(), pData.data(), pData.size());
}
SetData(std::move(data_copy), pData.size());
}
void CPDF_Stream::SetData(std::unique_ptr<uint8_t, FxFreeDeleter> pData,
uint32_t size) {
m_bMemoryBased = true;
m_pFile = nullptr;
m_pDataBuf = std::move(pData);
m_dwSize = size;
if (!m_pDict)
m_pDict = pdfium::MakeUnique<CPDF_Dictionary>();
m_pDict->SetNewFor<CPDF_Number>("Length", static_cast<int>(size));
}
void CPDF_Stream::SetDataFromStringstream(std::ostringstream* stream) {
if (stream->tellp() <= 0) {
SetData({});
return;
}
SetData({reinterpret_cast<const uint8_t*>(stream->str().c_str()),
static_cast<size_t>(stream->tellp())});
}
bool CPDF_Stream::ReadRawData(FX_FILESIZE offset,
uint8_t* buf,
uint32_t size) const {
if (!m_bMemoryBased && m_pFile)
return m_pFile->ReadBlock(buf, offset, size);
if (m_pDataBuf)
memcpy(buf, m_pDataBuf.get() + offset, size);
return true;
}
bool CPDF_Stream::HasFilter() const {
return m_pDict && m_pDict->KeyExist("Filter");
}
WideString CPDF_Stream::GetUnicodeText() const {
auto pAcc = pdfium::MakeRetain<CPDF_StreamAcc>(this);
pAcc->LoadAllDataFiltered();
return PDF_DecodeText(pAcc->GetData(), pAcc->GetSize());
}
bool CPDF_Stream::WriteTo(IFX_ArchiveStream* archive,
const CPDF_Encryptor* encryptor) const {
const bool is_metadata = IsMetaDataStreamDictionary(GetDict());
CPDF_FlateEncoder encoder(this, !is_metadata);
std::vector<uint8_t> encrypted_data;
pdfium::span<const uint8_t> data = encoder.GetSpan();
if (encryptor && !is_metadata) {
encrypted_data = encryptor->Encrypt(data);
data = encrypted_data;
}
if (static_cast<uint32_t>(encoder.GetDict()->GetIntegerFor("Length")) !=
data.size()) {
encoder.CloneDict();
encoder.GetClonedDict()->SetNewFor<CPDF_Number>(
"Length", static_cast<int>(data.size()));
}
if (!encoder.GetDict()->WriteTo(archive, encryptor))
return false;
if (!archive->WriteString("stream\r\n") ||
!archive->WriteBlock(data.data(), data.size()) ||
!archive->WriteString("\r\nendstream")) {
return false;
}
return true;
}
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