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-rw-r--r--core/fpdfapi/parser/cpdf_linearized.cpp71
1 files changed, 71 insertions, 0 deletions
diff --git a/core/fpdfapi/parser/cpdf_linearized.cpp b/core/fpdfapi/parser/cpdf_linearized.cpp
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+++ b/core/fpdfapi/parser/cpdf_linearized.cpp
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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.h"
+
+#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_Linearized> CPDF_Linearized::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_Linearized(pDict.get()));
+}
+
+CPDF_Linearized::CPDF_Linearized(const CPDF_Dictionary* pDict) {
+ if (!pDict)
+ return;
+ 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);
+ m_szHintLength = std::max(pHintStreamRange->GetIntegerAt(1), 0);
+ }
+}
+
+CPDF_Linearized::~CPDF_Linearized() {}
+
+bool CPDF_Linearized::HasHintTable() const {
+ return GetPageCount() > 1 && GetHintStart() > 0 && GetHintLength() > 0;
+}