Move core/fpdfapi/fpdf_parser to core/fpdfapi/parser

core/fpdfapi/fpdf_parser/cpdf_hint_tables.cpp

Index: core/fpdfapi/fpdf_parser/cpdf_hint_tables.cpp
diff --git a/core/fpdfapi/fpdf_parser/cpdf_hint_tables.cpp b/core/fpdfapi/fpdf_parser/cpdf_hint_tables.cpp
deleted file mode 100644
index ae602b252dabf2151c80a16d1d59f897b3bb8d3e..0000000000000000000000000000000000000000
--- a/core/fpdfapi/fpdf_parser/cpdf_hint_tables.cpp
+++ /dev/null
@@ -1,524 +0,0 @@
-// 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/fpdf_parser/cpdf_hint_tables.h"
-
-#include <limits>
-
-#include "core/fpdfapi/fpdf_parser/cpdf_array.h"
-#include "core/fpdfapi/fpdf_parser/cpdf_data_avail.h"
-#include "core/fpdfapi/fpdf_parser/cpdf_dictionary.h"
-#include "core/fpdfapi/fpdf_parser/cpdf_document.h"
-#include "core/fpdfapi/fpdf_parser/cpdf_stream.h"
-#include "core/fpdfapi/fpdf_parser/cpdf_stream_acc.h"
-#include "core/fxcrt/fx_safe_types.h"
-#include "third_party/base/numerics/safe_conversions.h"
-
-namespace {
-
-bool CanReadFromBitStream(const CFX_BitStream* hStream,
-                          const FX_SAFE_UINT32& bits) {
-  return bits.IsValid() && hStream->BitsRemaining() >= bits.ValueOrDie();
-}
-
-// Sanity check values from the page table header. The note in the PDF 1.7
-// reference for Table F.3 says the valid range is only 0 through 32. Though 0
-// is not useful either.
-bool IsValidPageOffsetHintTableBitCount(uint32_t bits) {
-  return bits > 0 && bits <= 32;
-}
-
-}  // namespace
-
-CPDF_HintTables::CPDF_HintTables(CPDF_DataAvail* pDataAvail,
-                                 CPDF_Dictionary* pLinearized)
-    : m_pDataAvail(pDataAvail),
-      m_pLinearizedDict(pLinearized),
-      m_nFirstPageSharedObjs(0),
-      m_szFirstPageObjOffset(0) {
-  ASSERT(m_pLinearizedDict);
-}
-
-CPDF_HintTables::~CPDF_HintTables() {}
-
-uint32_t CPDF_HintTables::GetItemLength(
-    uint32_t index,
-    const std::vector<FX_FILESIZE>& szArray) {
-  if (szArray.size() < 2 || index > szArray.size() - 2 ||
-      szArray[index] > szArray[index + 1]) {
-    return 0;
-  }
-  return szArray[index + 1] - szArray[index];
-}
-
-bool CPDF_HintTables::ReadPageHintTable(CFX_BitStream* hStream) {
-  if (!hStream || hStream->IsEOF())
-    return false;
-
-  int nStreamOffset = ReadPrimaryHintStreamOffset();
-  if (nStreamOffset < 0)
-    return false;
-
-  int nStreamLen = ReadPrimaryHintStreamLength();
-  if (nStreamLen < 1 ||
-      !pdfium::base::IsValueInRangeForNumericType<FX_FILESIZE>(nStreamLen)) {
-    return false;
-  }
-
-  const uint32_t kHeaderSize = 288;
-  if (hStream->BitsRemaining() < kHeaderSize)
-    return false;
-
-  // Item 1: The least number of objects in a page.
-  const uint32_t dwObjLeastNum = hStream->GetBits(32);
-  if (!dwObjLeastNum)
-    return false;
-
-  // Item 2: The location of the first page's page object.
-  const uint32_t dwFirstObjLoc = hStream->GetBits(32);
-  if (dwFirstObjLoc > static_cast<uint32_t>(nStreamOffset)) {
-    FX_SAFE_FILESIZE safeLoc = nStreamLen;
-    safeLoc += dwFirstObjLoc;
-    if (!safeLoc.IsValid())
-      return false;
-    m_szFirstPageObjOffset = safeLoc.ValueOrDie();
-  } else {
-    if (!pdfium::base::IsValueInRangeForNumericType<FX_FILESIZE>(dwFirstObjLoc))
-      return false;
-    m_szFirstPageObjOffset = dwFirstObjLoc;
-  }
-
-  // Item 3: The number of bits needed to represent the difference
-  // between the greatest and least number of objects in a page.
-  const uint32_t dwDeltaObjectsBits = hStream->GetBits(16);
-  if (!IsValidPageOffsetHintTableBitCount(dwDeltaObjectsBits))
-    return false;
-
-  // Item 4: The least length of a page in bytes.
-  const uint32_t dwPageLeastLen = hStream->GetBits(32);
-  if (!dwPageLeastLen)
-    return false;
-
-  // Item 5: The number of bits needed to represent the difference
-  // between the greatest and least length of a page, in bytes.
-  const uint32_t dwDeltaPageLenBits = hStream->GetBits(16);
-  if (!IsValidPageOffsetHintTableBitCount(dwDeltaPageLenBits))
-    return false;
-
-  // Skip Item 6, 7, 8, 9 total 96 bits.
-  hStream->SkipBits(96);
-
-  // Item 10: The number of bits needed to represent the greatest
-  // number of shared object references.
-  const uint32_t dwSharedObjBits = hStream->GetBits(16);
-  if (!IsValidPageOffsetHintTableBitCount(dwSharedObjBits))
-    return false;
-
-  // Item 11: The number of bits needed to represent the numerically
-  // greatest shared object identifier used by the pages.
-  const uint32_t dwSharedIdBits = hStream->GetBits(16);
-  if (!IsValidPageOffsetHintTableBitCount(dwSharedIdBits))
-    return false;
-
-  // Item 12: The number of bits needed to represent the numerator of
-  // the fractional position for each shared object reference. For each
-  // shared object referenced from a page, there is an indication of
-  // where in the page's content stream the object is first referenced.
-  const uint32_t dwSharedNumeratorBits = hStream->GetBits(16);
-  if (!IsValidPageOffsetHintTableBitCount(dwSharedNumeratorBits))
-    return false;
-
-  // Item 13: Skip Item 13 which has 16 bits.
-  hStream->SkipBits(16);
-
-  const int nPages = GetNumberOfPages();
-  if (nPages < 1 || nPages >= FPDF_PAGE_MAX_NUM)
-    return false;
-
-  const uint32_t dwPages = pdfium::base::checked_cast<uint32_t>(nPages);
-  FX_SAFE_UINT32 required_bits = dwDeltaObjectsBits;
-  required_bits *= dwPages;
-  if (!CanReadFromBitStream(hStream, required_bits))
-    return false;
-
-  for (int i = 0; i < nPages; ++i) {
-    FX_SAFE_UINT32 safeDeltaObj = hStream->GetBits(dwDeltaObjectsBits);
-    safeDeltaObj += dwObjLeastNum;
-    if (!safeDeltaObj.IsValid())
-      return false;
-    m_dwDeltaNObjsArray.push_back(safeDeltaObj.ValueOrDie());
-  }
-  hStream->ByteAlign();
-
-  required_bits = dwDeltaPageLenBits;
-  required_bits *= dwPages;
-  if (!CanReadFromBitStream(hStream, required_bits))
-    return false;
-
-  std::vector<uint32_t> dwPageLenArray;
-  for (int i = 0; i < nPages; ++i) {
-    FX_SAFE_UINT32 safePageLen = hStream->GetBits(dwDeltaPageLenBits);
-    safePageLen += dwPageLeastLen;
-    if (!safePageLen.IsValid())
-      return false;
-
-    dwPageLenArray.push_back(safePageLen.ValueOrDie());
-  }
-
-  int nOffsetE = GetEndOfFirstPageOffset();
-  if (nOffsetE < 0)
-    return false;
-
-  int nFirstPageNum = GetFirstPageNumber();
-  if (nFirstPageNum < 0 || nFirstPageNum > std::numeric_limits<int>::max() - 1)
-    return false;
-
-  for (int i = 0; i < nPages; ++i) {
-    if (i == nFirstPageNum) {
-      m_szPageOffsetArray.push_back(m_szFirstPageObjOffset);
-    } else if (i == nFirstPageNum + 1) {
-      if (i == 1) {
-        m_szPageOffsetArray.push_back(nOffsetE);
-      } else {
-        m_szPageOffsetArray.push_back(m_szPageOffsetArray[i - 2] +
-                                      dwPageLenArray[i - 2]);
-      }
-    } else {
-      if (i == 0) {
-        m_szPageOffsetArray.push_back(nOffsetE);
-      } else {
-        m_szPageOffsetArray.push_back(m_szPageOffsetArray[i - 1] +
-                                      dwPageLenArray[i - 1]);
-      }
-    }
-  }
-
-  m_szPageOffsetArray.push_back(m_szPageOffsetArray[nPages - 1] +
-                                dwPageLenArray[nPages - 1]);
-  hStream->ByteAlign();
-
-  // Number of shared objects.
-  required_bits = dwSharedObjBits;
-  required_bits *= dwPages;
-  if (!CanReadFromBitStream(hStream, required_bits))
-    return false;
-
-  for (int i = 0; i < nPages; i++)
-    m_dwNSharedObjsArray.push_back(hStream->GetBits(dwSharedObjBits));
-  hStream->ByteAlign();
-
-  // Array of identifiers, size = nshared_objects.
-  for (int i = 0; i < nPages; i++) {
-    required_bits = dwSharedIdBits;
-    required_bits *= m_dwNSharedObjsArray[i];
-    if (!CanReadFromBitStream(hStream, required_bits))
-      return false;
-
-    for (uint32_t j = 0; j < m_dwNSharedObjsArray[i]; j++)
-      m_dwIdentifierArray.push_back(hStream->GetBits(dwSharedIdBits));
-  }
-  hStream->ByteAlign();
-
-  for (int i = 0; i < nPages; i++) {
-    FX_SAFE_UINT32 safeSize = m_dwNSharedObjsArray[i];
-    safeSize *= dwSharedNumeratorBits;
-    if (!CanReadFromBitStream(hStream, safeSize))
-      return false;
-
-    hStream->SkipBits(safeSize.ValueOrDie());
-  }
-  hStream->ByteAlign();
-
-  FX_SAFE_UINT32 safeTotalPageLen = dwPages;
-  safeTotalPageLen *= dwDeltaPageLenBits;
-  if (!CanReadFromBitStream(hStream, safeTotalPageLen))
-    return false;
-
-  hStream->SkipBits(safeTotalPageLen.ValueOrDie());
-  hStream->ByteAlign();
-  return true;
-}
-
-bool CPDF_HintTables::ReadSharedObjHintTable(CFX_BitStream* hStream,
-                                             uint32_t offset) {
-  if (!hStream || hStream->IsEOF())
-    return false;
-
-  int nStreamOffset = ReadPrimaryHintStreamOffset();
-  int nStreamLen = ReadPrimaryHintStreamLength();
-  if (nStreamOffset < 0 || nStreamLen < 1)
-    return false;
-
-  FX_SAFE_UINT32 bit_offset = offset;
-  bit_offset *= 8;
-  if (!bit_offset.IsValid() || hStream->GetPos() > bit_offset.ValueOrDie())
-    return false;
-  hStream->SkipBits(bit_offset.ValueOrDie() - hStream->GetPos());
-
-  const uint32_t kHeaderSize = 192;
-  if (hStream->BitsRemaining() < kHeaderSize)
-    return false;
-
-  // Item 1: The object number of the first object in the shared objects
-  // section.
-  uint32_t dwFirstSharedObjNum = hStream->GetBits(32);
-
-  // Item 2: The location of the first object in the shared objects section.
-  uint32_t dwFirstSharedObjLoc = hStream->GetBits(32);
-  if (dwFirstSharedObjLoc > static_cast<uint32_t>(nStreamOffset))
-    dwFirstSharedObjLoc += nStreamLen;
-
-  // Item 3: The number of shared object entries for the first page.
-  m_nFirstPageSharedObjs = hStream->GetBits(32);
-
-  // Item 4: The number of shared object entries for the shared objects
-  // section, including the number of shared object entries for the first page.
-  uint32_t dwSharedObjTotal = hStream->GetBits(32);
-
-  // Item 5: The number of bits needed to represent the greatest number of
-  // objects in a shared object group. Skipped.
-  hStream->SkipBits(16);
-
-  // Item 6: The least length of a shared object group in bytes.
-  uint32_t dwGroupLeastLen = hStream->GetBits(32);
-
-  // Item 7: The number of bits needed to represent the difference between the
-  // greatest and least length of a shared object group, in bytes.
-  uint32_t dwDeltaGroupLen = hStream->GetBits(16);
-
-  if (dwFirstSharedObjNum >= CPDF_Parser::kMaxObjectNumber ||
-      m_nFirstPageSharedObjs >= CPDF_Parser::kMaxObjectNumber ||
-      dwSharedObjTotal >= CPDF_Parser::kMaxObjectNumber) {
-    return false;
-  }
-
-  int nFirstPageObjNum = GetFirstPageObjectNumber();
-  if (nFirstPageObjNum < 0)
-    return false;
-
-  uint32_t dwPrevObjLen = 0;
-  uint32_t dwCurObjLen = 0;
-  FX_SAFE_UINT32 required_bits = dwSharedObjTotal;
-  required_bits *= dwDeltaGroupLen;
-  if (!CanReadFromBitStream(hStream, required_bits))
-    return false;
-
-  for (uint32_t i = 0; i < dwSharedObjTotal; ++i) {
-    dwPrevObjLen = dwCurObjLen;
-    FX_SAFE_UINT32 safeObjLen = hStream->GetBits(dwDeltaGroupLen);
-    safeObjLen += dwGroupLeastLen;
-    if (!safeObjLen.IsValid())
-      return false;
-
-    dwCurObjLen = safeObjLen.ValueOrDie();
-    if (i < m_nFirstPageSharedObjs) {
-      m_dwSharedObjNumArray.push_back(nFirstPageObjNum + i);
-      if (i == 0)
-        m_szSharedObjOffsetArray.push_back(m_szFirstPageObjOffset);
-    } else {
-      FX_SAFE_UINT32 safeObjNum = dwFirstSharedObjNum;
-      safeObjNum += i - m_nFirstPageSharedObjs;
-      if (!safeObjNum.IsValid())
-        return false;
-
-      m_dwSharedObjNumArray.push_back(safeObjNum.ValueOrDie());
-      if (i == m_nFirstPageSharedObjs) {
-        FX_SAFE_FILESIZE safeLoc = dwFirstSharedObjLoc;
-        if (!safeLoc.IsValid())
-          return false;
-
-        m_szSharedObjOffsetArray.push_back(safeLoc.ValueOrDie());
-      }
-    }
-
-    if (i != 0 && i != m_nFirstPageSharedObjs) {
-      FX_SAFE_FILESIZE safeLoc = dwPrevObjLen;
-      safeLoc += m_szSharedObjOffsetArray[i - 1];
-      if (!safeLoc.IsValid())
-        return false;
-
-      m_szSharedObjOffsetArray.push_back(safeLoc.ValueOrDie());
-    }
-  }
-
-  if (dwSharedObjTotal > 0) {
-    FX_SAFE_FILESIZE safeLoc = dwCurObjLen;
-    safeLoc += m_szSharedObjOffsetArray[dwSharedObjTotal - 1];
-    if (!safeLoc.IsValid())
-      return false;
-
-    m_szSharedObjOffsetArray.push_back(safeLoc.ValueOrDie());
-  }
-
-  hStream->ByteAlign();
-  if (hStream->BitsRemaining() < dwSharedObjTotal)
-    return false;
-
-  hStream->SkipBits(dwSharedObjTotal);
-  hStream->ByteAlign();
-  return true;
-}
-
-bool CPDF_HintTables::GetPagePos(uint32_t index,
-                                 FX_FILESIZE* szPageStartPos,
-                                 FX_FILESIZE* szPageLength,
-                                 uint32_t* dwObjNum) {
-  *szPageStartPos = m_szPageOffsetArray[index];
-  *szPageLength = GetItemLength(index, m_szPageOffsetArray);
-
-  int nFirstPageObjNum = GetFirstPageObjectNumber();
-  if (nFirstPageObjNum < 0)
-    return false;
-
-  int nFirstPageNum = GetFirstPageNumber();
-  if (!pdfium::base::IsValueInRangeForNumericType<uint32_t>(nFirstPageNum))
-    return false;
-
-  uint32_t dwFirstPageNum = static_cast<uint32_t>(nFirstPageNum);
-  if (index == dwFirstPageNum) {
-    *dwObjNum = nFirstPageObjNum;
-    return true;
-  }
-
-  // The object number of remaining pages starts from 1.
-  *dwObjNum = 1;
-  for (uint32_t i = 0; i < index; ++i) {
-    if (i == dwFirstPageNum)
-      continue;
-    *dwObjNum += m_dwDeltaNObjsArray[i];
-  }
-  return true;
-}
-
-CPDF_DataAvail::DocAvailStatus CPDF_HintTables::CheckPage(
-    uint32_t index,
-    CPDF_DataAvail::DownloadHints* pHints) {
-  if (!pHints)
-    return CPDF_DataAvail::DataError;
-
-  int nFirstPageNum = GetFirstPageNumber();
-  if (!pdfium::base::IsValueInRangeForNumericType<uint32_t>(nFirstPageNum))
-    return CPDF_DataAvail::DataError;
-
-  if (index == static_cast<uint32_t>(nFirstPageNum))
-    return CPDF_DataAvail::DataAvailable;
-
-  uint32_t dwLength = GetItemLength(index, m_szPageOffsetArray);
-  // If two pages have the same offset, it should be treated as an error.
-  if (!dwLength)
-    return CPDF_DataAvail::DataError;
-
-  if (!m_pDataAvail->IsDataAvail(m_szPageOffsetArray[index], dwLength, pHints))
-    return CPDF_DataAvail::DataNotAvailable;
-
-  // Download data of shared objects in the page.
-  uint32_t offset = 0;
-  for (uint32_t i = 0; i < index; ++i)
-    offset += m_dwNSharedObjsArray[i];
-
-  int nFirstPageObjNum = GetFirstPageObjectNumber();
-  if (nFirstPageObjNum < 0)
-    return CPDF_DataAvail::DataError;
-
-  uint32_t dwIndex = 0;
-  uint32_t dwObjNum = 0;
-  for (uint32_t j = 0; j < m_dwNSharedObjsArray[index]; ++j) {
-    dwIndex = m_dwIdentifierArray[offset + j];
-    if (dwIndex >= m_dwSharedObjNumArray.size())
-      return CPDF_DataAvail::DataNotAvailable;
-
-    dwObjNum = m_dwSharedObjNumArray[dwIndex];
-    if (dwObjNum >= static_cast<uint32_t>(nFirstPageObjNum) &&
-        dwObjNum <
-            static_cast<uint32_t>(nFirstPageObjNum) + m_nFirstPageSharedObjs) {
-      continue;
-    }
-
-    dwLength = GetItemLength(dwIndex, m_szSharedObjOffsetArray);
-    // If two objects have the same offset, it should be treated as an error.
-    if (!dwLength)
-      return CPDF_DataAvail::DataError;
-
-    if (!m_pDataAvail->IsDataAvail(m_szSharedObjOffsetArray[dwIndex], dwLength,
-                                   pHints)) {
-      return CPDF_DataAvail::DataNotAvailable;
-    }
-  }
-  return CPDF_DataAvail::DataAvailable;
-}
-
-bool CPDF_HintTables::LoadHintStream(CPDF_Stream* pHintStream) {
-  if (!pHintStream)
-    return false;
-
-  CPDF_Dictionary* pDict = pHintStream->GetDict();
-  CPDF_Object* pOffset = pDict ? pDict->GetObjectFor("S") : nullptr;
-  if (!pOffset || !pOffset->IsNumber())
-    return false;
-
-  int shared_hint_table_offset = pOffset->GetInteger();
-  if (shared_hint_table_offset <= 0)
-    return false;
-
-  CPDF_StreamAcc acc;
-  acc.LoadAllData(pHintStream);
-
-  uint32_t size = acc.GetSize();
-  // The header section of page offset hint table is 36 bytes.
-  // The header section of shared object hint table is 24 bytes.
-  // Hint table has at least 60 bytes.
-  const uint32_t kMinStreamLength = 60;
-  if (size < kMinStreamLength)
-    return false;
-
-  FX_SAFE_UINT32 safe_shared_hint_table_offset = shared_hint_table_offset;
-  if (!safe_shared_hint_table_offset.IsValid() ||
-      size < safe_shared_hint_table_offset.ValueOrDie()) {
-    return false;
-  }
-
-  CFX_BitStream bs;
-  bs.Init(acc.GetData(), size);
-  return ReadPageHintTable(&bs) &&
-         ReadSharedObjHintTable(&bs, shared_hint_table_offset);
-}
-
-int CPDF_HintTables::GetEndOfFirstPageOffset() const {
-  CPDF_Object* pOffsetE = m_pLinearizedDict->GetDirectObjectFor("E");
-  return pOffsetE ? pOffsetE->GetInteger() : -1;
-}
-
-int CPDF_HintTables::GetNumberOfPages() const {
-  CPDF_Object* pPageNum = m_pLinearizedDict->GetDirectObjectFor("N");
-  return pPageNum ? pPageNum->GetInteger() : 0;
-}
-
-int CPDF_HintTables::GetFirstPageObjectNumber() const {
-  CPDF_Object* pFirstPageObj = m_pLinearizedDict->GetDirectObjectFor("O");
-  return pFirstPageObj ? pFirstPageObj->GetInteger() : -1;
-}
-
-int CPDF_HintTables::GetFirstPageNumber() const {
-  CPDF_Object* pFirstPageNum = m_pLinearizedDict->GetDirectObjectFor("P");
-  return pFirstPageNum ? pFirstPageNum->GetInteger() : 0;
-}
-
-int CPDF_HintTables::ReadPrimaryHintStreamOffset() const {
-  return ReadPrimaryHintStream(0);
-}
-
-int CPDF_HintTables::ReadPrimaryHintStreamLength() const {
-  return ReadPrimaryHintStream(1);
-}
-
-int CPDF_HintTables::ReadPrimaryHintStream(int index) const {
-  CPDF_Array* pRange = m_pLinearizedDict->GetArrayFor("H");
-  if (!pRange)
-    return -1;
-
-  CPDF_Object* pStreamLen = pRange->GetDirectObjectAt(index);
-  return pStreamLen ? pStreamLen->GetInteger() : -1;
-}