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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/fpdfapi/edit/cpdf_flateencoder.h"
#include <memory>
#include "constants/stream_dict_common.h"
#include "core/fpdfapi/parser/cpdf_dictionary.h"
#include "core/fpdfapi/parser/cpdf_name.h"
#include "core/fpdfapi/parser/cpdf_number.h"
#include "core/fpdfapi/parser/fpdf_parser_decode.h"
CPDF_FlateEncoder::CPDF_FlateEncoder(const CPDF_Stream* pStream,
bool bFlateEncode)
: m_pAcc(pdfium::MakeRetain<CPDF_StreamAcc>(pStream)), m_dwSize(0) {
m_pAcc->LoadAllDataRaw();
bool bHasFilter = pStream && pStream->HasFilter();
if (bHasFilter && !bFlateEncode) {
auto pDestAcc = pdfium::MakeRetain<CPDF_StreamAcc>(pStream);
pDestAcc->LoadAllDataFiltered();
m_dwSize = pDestAcc->GetSize();
m_pData = pDestAcc->DetachData();
m_pClonedDict = ToDictionary(pStream->GetDict()->Clone());
m_pClonedDict->RemoveFor("Filter");
ASSERT(!m_pDict);
return;
}
if (bHasFilter || !bFlateEncode) {
m_pData = m_pAcc->GetData();
m_dwSize = m_pAcc->GetSize();
m_pDict = pStream->GetDict();
ASSERT(!m_pClonedDict);
return;
}
// TODO(thestig): Move to Init() and check return value.
uint8_t* buffer = nullptr;
::FlateEncode(m_pAcc->GetSpan(), &buffer, &m_dwSize);
m_pData = std::unique_ptr<uint8_t, FxFreeDeleter>(buffer);
m_pClonedDict = ToDictionary(pStream->GetDict()->Clone());
m_pClonedDict->SetNewFor<CPDF_Number>("Length", static_cast<int>(m_dwSize));
m_pClonedDict->SetNewFor<CPDF_Name>("Filter", "FlateDecode");
m_pClonedDict->RemoveFor(pdfium::stream::kDecodeParms);
ASSERT(!m_pDict);
}
CPDF_FlateEncoder::~CPDF_FlateEncoder() {}
void CPDF_FlateEncoder::CloneDict() {
if (m_pClonedDict) {
ASSERT(!m_pDict);
return;
}
m_pClonedDict = ToDictionary(m_pDict->Clone());
ASSERT(m_pClonedDict);
m_pDict.Release();
}
CPDF_Dictionary* CPDF_FlateEncoder::GetClonedDict() {
ASSERT(!m_pDict);
return m_pClonedDict.get();
}
const CPDF_Dictionary* CPDF_FlateEncoder::GetDict() const {
if (m_pClonedDict) {
ASSERT(!m_pDict);
return m_pClonedDict.get();
}
return m_pDict.Get();
}
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