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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_linearized_header.h"
#include <algorithm>
#include <utility>
#include "core/fpdfapi/parser/cpdf_array.h"
#include "core/fpdfapi/parser/cpdf_dictionary.h"
#include "core/fpdfapi/parser/cpdf_number.h"
#include "third_party/base/ptr_util.h"
namespace {
template <class T>
bool IsValidNumericDictionaryValue(const CPDF_Dictionary* pDict,
const char* key,
T min_value,
bool must_exist = true) {
if (!pDict->KeyExist(key))
return !must_exist;
const CPDF_Number* pNum = ToNumber(pDict->GetObjectFor(key));
if (!pNum || !pNum->IsInteger())
return false;
const int raw_value = pNum->GetInteger();
if (!pdfium::base::IsValueInRangeForNumericType<T>(raw_value))
return false;
return static_cast<T>(raw_value) >= min_value;
}
} // namespace
// static
std::unique_ptr<CPDF_LinearizedHeader> CPDF_LinearizedHeader::CreateForObject(
std::unique_ptr<CPDF_Object> pObj) {
auto pDict = ToDictionary(std::move(pObj));
if (!pDict || !pDict->KeyExist("Linearized") ||
!IsValidNumericDictionaryValue<FX_FILESIZE>(pDict.get(), "L", 1) ||
!IsValidNumericDictionaryValue<uint32_t>(pDict.get(), "P", 0, false) ||
!IsValidNumericDictionaryValue<FX_FILESIZE>(pDict.get(), "T", 1) ||
!IsValidNumericDictionaryValue<uint32_t>(pDict.get(), "N", 0) ||
!IsValidNumericDictionaryValue<FX_FILESIZE>(pDict.get(), "E", 1) ||
!IsValidNumericDictionaryValue<uint32_t>(pDict.get(), "O", 1))
return nullptr;
return pdfium::WrapUnique(new CPDF_LinearizedHeader(pDict.get()));
}
CPDF_LinearizedHeader::CPDF_LinearizedHeader(const CPDF_Dictionary* pDict) {
m_szFileSize = pDict->GetIntegerFor("L");
m_dwFirstPageNo = pDict->GetIntegerFor("P");
m_szLastXRefOffset = pDict->GetIntegerFor("T");
m_PageCount = pDict->GetIntegerFor("N");
m_szFirstPageEndOffset = pDict->GetIntegerFor("E");
m_FirstPageObjNum = pDict->GetIntegerFor("O");
const CPDF_Array* pHintStreamRange = pDict->GetArrayFor("H");
const size_t nHintStreamSize =
pHintStreamRange ? pHintStreamRange->GetCount() : 0;
if (nHintStreamSize == 2 || nHintStreamSize == 4) {
m_szHintStart = std::max(pHintStreamRange->GetIntegerAt(0), 0);
const FX_SAFE_UINT32 safe_hint_length = pHintStreamRange->GetIntegerAt(1);
if (safe_hint_length.IsValid())
m_HintLength = safe_hint_length.ValueOrDie();
}
}
CPDF_LinearizedHeader::~CPDF_LinearizedHeader() {}
bool CPDF_LinearizedHeader::HasHintTable() const {
return GetPageCount() > 1 && GetHintStart() > 0 && GetHintLength() > 0;
}
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