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| 1 // Copyright 2016 PDFium Authors. All rights reserved. | 1 // Copyright 2016 PDFium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
| 4 | 4 |
| 5 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com | 5 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com |
| 6 | 6 |
| 7 #include "core/fpdfapi/parser/cpdf_hint_tables.h" | 7 #include "core/fpdfapi/parser/cpdf_hint_tables.h" |
| 8 | 8 |
| 9 #include <limits> | 9 #include <limits> |
| 10 | 10 |
| 11 #include "core/fpdfapi/parser/cpdf_array.h" | 11 #include "core/fpdfapi/parser/cpdf_array.h" |
| 12 #include "core/fpdfapi/parser/cpdf_data_avail.h" | 12 #include "core/fpdfapi/parser/cpdf_data_avail.h" |
| 13 #include "core/fpdfapi/parser/cpdf_dictionary.h" | 13 #include "core/fpdfapi/parser/cpdf_dictionary.h" |
| 14 #include "core/fpdfapi/parser/cpdf_document.h" | 14 #include "core/fpdfapi/parser/cpdf_document.h" |
| 15 #include "core/fpdfapi/parser/cpdf_linearized.h" | 15 #include "core/fpdfapi/parser/cpdf_linearized_header.h" |
| 16 #include "core/fpdfapi/parser/cpdf_stream.h" | 16 #include "core/fpdfapi/parser/cpdf_stream.h" |
| 17 #include "core/fpdfapi/parser/cpdf_stream_acc.h" | 17 #include "core/fpdfapi/parser/cpdf_stream_acc.h" |
| 18 #include "core/fxcrt/fx_safe_types.h" | 18 #include "core/fxcrt/fx_safe_types.h" |
| 19 #include "third_party/base/numerics/safe_conversions.h" | 19 #include "third_party/base/numerics/safe_conversions.h" |
| 20 | 20 |
| 21 namespace { | 21 namespace { |
| 22 | 22 |
| 23 bool CanReadFromBitStream(const CFX_BitStream* hStream, | 23 bool CanReadFromBitStream(const CFX_BitStream* hStream, |
| 24 const FX_SAFE_UINT32& bits) { | 24 const FX_SAFE_UINT32& bits) { |
| 25 return bits.IsValid() && hStream->BitsRemaining() >= bits.ValueOrDie(); | 25 return bits.IsValid() && hStream->BitsRemaining() >= bits.ValueOrDie(); |
| 26 } | 26 } |
| 27 | 27 |
| 28 // Sanity check values from the page table header. The note in the PDF 1.7 | 28 // Sanity check values from the page table header. The note in the PDF 1.7 |
| 29 // reference for Table F.3 says the valid range is only 0 through 32. Though 0 | 29 // reference for Table F.3 says the valid range is only 0 through 32. Though 0 |
| 30 // is not useful either. | 30 // is not useful either. |
| 31 bool IsValidPageOffsetHintTableBitCount(uint32_t bits) { | 31 bool IsValidPageOffsetHintTableBitCount(uint32_t bits) { |
| 32 return bits > 0 && bits <= 32; | 32 return bits > 0 && bits <= 32; |
| 33 } | 33 } |
| 34 | 34 |
| 35 } // namespace | 35 } // namespace |
| 36 | 36 |
| 37 CPDF_HintTables::CPDF_HintTables(CPDF_DataAvail* pDataAvail, | 37 CPDF_HintTables::CPDF_HintTables(CPDF_DataAvail* pDataAvail, |
| 38 CPDF_Linearized* pLinearized) | 38 CPDF_LinearizedHeader* pLinearized) |
| 39 : m_pDataAvail(pDataAvail), | 39 : m_pDataAvail(pDataAvail), |
| 40 m_pLinearized(pLinearized), | 40 m_pLinearized(pLinearized), |
| 41 m_nFirstPageSharedObjs(0), | 41 m_nFirstPageSharedObjs(0), |
| 42 m_szFirstPageObjOffset(0) { | 42 m_szFirstPageObjOffset(0) { |
| 43 ASSERT(m_pLinearized); | 43 ASSERT(m_pLinearized); |
| 44 } | 44 } |
| 45 | 45 |
| 46 CPDF_HintTables::~CPDF_HintTables() {} | 46 CPDF_HintTables::~CPDF_HintTables() {} |
| 47 | 47 |
| 48 uint32_t CPDF_HintTables::GetItemLength( | 48 uint32_t CPDF_HintTables::GetItemLength( |
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| 503 return static_cast<int>(m_pLinearized->GetFirstPageNo()); | 503 return static_cast<int>(m_pLinearized->GetFirstPageNo()); |
| 504 } | 504 } |
| 505 | 505 |
| 506 int CPDF_HintTables::ReadPrimaryHintStreamOffset() const { | 506 int CPDF_HintTables::ReadPrimaryHintStreamOffset() const { |
| 507 return static_cast<int>(m_pLinearized->GetHintStart()); | 507 return static_cast<int>(m_pLinearized->GetHintStart()); |
| 508 } | 508 } |
| 509 | 509 |
| 510 int CPDF_HintTables::ReadPrimaryHintStreamLength() const { | 510 int CPDF_HintTables::ReadPrimaryHintStreamLength() const { |
| 511 return static_cast<int>(m_pLinearized->GetHintLength()); | 511 return static_cast<int>(m_pLinearized->GetHintLength()); |
| 512 } | 512 } |
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