Move core/src/ up to core/.

core/src/fpdfapi/fpdf_parser/cpdf_hint_tables.cpp

Index: core/src/fpdfapi/fpdf_parser/cpdf_hint_tables.cpp
diff --git a/core/src/fpdfapi/fpdf_parser/cpdf_hint_tables.cpp b/core/src/fpdfapi/fpdf_parser/cpdf_hint_tables.cpp
deleted file mode 100644
index 84464fcff2ddceda7a9f84a000eb06d7ff11f16c..0000000000000000000000000000000000000000
--- a/core/src/fpdfapi/fpdf_parser/cpdf_hint_tables.cpp
+++ /dev/null
@@ -1,469 +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/src/fpdfapi/fpdf_parser/cpdf_hint_tables.h"
-
-#include "core/include/fxcrt/fx_safe_types.h"
-#include "core/include/fpdfapi/cpdf_array.h"
-#include "core/include/fpdfapi/cpdf_dictionary.h"
-#include "core/include/fpdfapi/cpdf_stream.h"
-#include "core/src/fpdfapi/fpdf_parser/cpdf_data_avail.h"
-
-namespace {
-
-bool CanReadFromBitStream(const CFX_BitStream* hStream,
-                          const FX_SAFE_DWORD& num_bits) {
-  return num_bits.IsValid() &&
-         hStream->BitsRemaining() >= num_bits.ValueOrDie();
-}
-
-}  // namespace
-
-CPDF_HintTables::~CPDF_HintTables() {
-  m_dwDeltaNObjsArray.RemoveAll();
-  m_dwNSharedObjsArray.RemoveAll();
-  m_dwSharedObjNumArray.RemoveAll();
-  m_dwIdentifierArray.RemoveAll();
-}
-
-FX_DWORD CPDF_HintTables::GetItemLength(
-    int index,
-    const std::vector<FX_FILESIZE>& szArray) {
-  if (index < 0 || szArray.size() < 2 ||
-      static_cast<size_t>(index) > szArray.size() - 2 ||
-      szArray[index] > szArray[index + 1]) {
-    return 0;
-  }
-  return szArray[index + 1] - szArray[index];
-}
-
-FX_BOOL CPDF_HintTables::ReadPageHintTable(CFX_BitStream* hStream) {
-  if (!hStream || hStream->IsEOF())
-    return FALSE;
-
-  int nStreamOffset = ReadPrimaryHintStreamOffset();
-  int nStreamLen = ReadPrimaryHintStreamLength();
-  if (nStreamOffset < 0 || nStreamLen < 1)
-    return FALSE;
-
-  const FX_DWORD kHeaderSize = 288;
-  if (hStream->BitsRemaining() < kHeaderSize)
-    return FALSE;
-
-  // Item 1: The least number of objects in a page.
-  FX_DWORD dwObjLeastNum = hStream->GetBits(32);
-
-  // Item 2: The location of the first page's page object.
-  FX_DWORD dwFirstObjLoc = hStream->GetBits(32);
-  if (dwFirstObjLoc > nStreamOffset) {
-    FX_SAFE_DWORD safeLoc = pdfium::base::checked_cast<FX_DWORD>(nStreamLen);
-    safeLoc += dwFirstObjLoc;
-    if (!safeLoc.IsValid())
-      return FALSE;
-    m_szFirstPageObjOffset =
-        pdfium::base::checked_cast<FX_FILESIZE>(safeLoc.ValueOrDie());
-  } else {
-    m_szFirstPageObjOffset =
-        pdfium::base::checked_cast<FX_FILESIZE>(dwFirstObjLoc);
-  }
-
-  // Item 3: The number of bits needed to represent the difference
-  // between the greatest and least number of objects in a page.
-  FX_DWORD dwDeltaObjectsBits = hStream->GetBits(16);
-
-  // Item 4: The least length of a page in bytes.
-  FX_DWORD dwPageLeastLen = hStream->GetBits(32);
-
-  // Item 5: The number of bits needed to represent the difference
-  // between the greatest and least length of a page, in bytes.
-  FX_DWORD dwDeltaPageLenBits = hStream->GetBits(16);
-
-  // 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.
-  FX_DWORD dwSharedObjBits = hStream->GetBits(16);
-
-  // Item 11: The number of bits needed to represent the numerically
-  // greatest shared object identifier used by the pages.
-  FX_DWORD dwSharedIdBits = hStream->GetBits(16);
-
-  // 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.
-  FX_DWORD dwSharedNumeratorBits = hStream->GetBits(16);
-
-  // Item 13: Skip Item 13 which has 16 bits.
-  hStream->SkipBits(16);
-
-  CPDF_Object* pPageNum = m_pLinearizedDict->GetElementValue("N");
-  int nPages = pPageNum ? pPageNum->GetInteger() : 0;
-  if (nPages < 1)
-    return FALSE;
-
-  FX_SAFE_DWORD required_bits = dwDeltaObjectsBits;
-  required_bits *= pdfium::base::checked_cast<FX_DWORD>(nPages);
-  if (!CanReadFromBitStream(hStream, required_bits))
-    return FALSE;
-
-  for (int i = 0; i < nPages; ++i) {
-    FX_SAFE_DWORD safeDeltaObj = hStream->GetBits(dwDeltaObjectsBits);
-    safeDeltaObj += dwObjLeastNum;
-    if (!safeDeltaObj.IsValid())
-      return FALSE;
-    m_dwDeltaNObjsArray.Add(safeDeltaObj.ValueOrDie());
-  }
-  hStream->ByteAlign();
-
-  required_bits = dwDeltaPageLenBits;
-  required_bits *= pdfium::base::checked_cast<FX_DWORD>(nPages);
-  if (!CanReadFromBitStream(hStream, required_bits))
-    return FALSE;
-
-  CFX_DWordArray dwPageLenArray;
-  for (int i = 0; i < nPages; ++i) {
-    FX_SAFE_DWORD safePageLen = hStream->GetBits(dwDeltaPageLenBits);
-    safePageLen += dwPageLeastLen;
-    if (!safePageLen.IsValid())
-      return FALSE;
-    dwPageLenArray.Add(safePageLen.ValueOrDie());
-  }
-
-  CPDF_Object* pOffsetE = m_pLinearizedDict->GetElementValue("E");
-  int nOffsetE = pOffsetE ? pOffsetE->GetInteger() : -1;
-  if (nOffsetE < 0)
-    return FALSE;
-
-  CPDF_Object* pFirstPageNum = m_pLinearizedDict->GetElementValue("P");
-  int nFirstPageNum = pFirstPageNum ? pFirstPageNum->GetInteger() : 0;
-  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]);
-      }
-    }
-  }
-
-  if (nPages > 0) {
-    m_szPageOffsetArray.push_back(m_szPageOffsetArray[nPages - 1] +
-                                  dwPageLenArray[nPages - 1]);
-  }
-  hStream->ByteAlign();
-
-  // Number of shared objects.
-  required_bits = dwSharedObjBits;
-  required_bits *= pdfium::base::checked_cast<FX_DWORD>(nPages);
-  if (!CanReadFromBitStream(hStream, required_bits))
-    return FALSE;
-
-  for (int i = 0; i < nPages; i++)
-    m_dwNSharedObjsArray.Add(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 (int j = 0; j < m_dwNSharedObjsArray[i]; j++)
-      m_dwIdentifierArray.Add(hStream->GetBits(dwSharedIdBits));
-  }
-  hStream->ByteAlign();
-
-  for (int i = 0; i < nPages; i++) {
-    FX_SAFE_DWORD safeSize = m_dwNSharedObjsArray[i];
-    safeSize *= dwSharedNumeratorBits;
-    if (!CanReadFromBitStream(hStream, safeSize))
-      return FALSE;
-
-    hStream->SkipBits(safeSize.ValueOrDie());
-  }
-  hStream->ByteAlign();
-
-  FX_SAFE_DWORD safeTotalPageLen = pdfium::base::checked_cast<FX_DWORD>(nPages);
-  safeTotalPageLen *= dwDeltaPageLenBits;
-  if (!CanReadFromBitStream(hStream, safeTotalPageLen))
-    return FALSE;
-
-  hStream->SkipBits(safeTotalPageLen.ValueOrDie());
-  hStream->ByteAlign();
-  return TRUE;
-}
-
-FX_BOOL CPDF_HintTables::ReadSharedObjHintTable(CFX_BitStream* hStream,
-                                                FX_DWORD offset) {
-  if (!hStream || hStream->IsEOF())
-    return FALSE;
-
-  int nStreamOffset = ReadPrimaryHintStreamOffset();
-  int nStreamLen = ReadPrimaryHintStreamLength();
-  if (nStreamOffset < 0 || nStreamLen < 1)
-    return FALSE;
-
-  FX_SAFE_DWORD 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 FX_DWORD kHeaderSize = 192;
-  if (hStream->BitsRemaining() < kHeaderSize)
-    return FALSE;
-
-  // Item 1: The object number of the first object in the shared objects
-  // section.
-  FX_DWORD dwFirstSharedObjNum = hStream->GetBits(32);
-
-  // Item 2: The location of the first object in the shared objects section.
-  FX_DWORD dwFirstSharedObjLoc = hStream->GetBits(32);
-  if (dwFirstSharedObjLoc > 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.
-  FX_DWORD 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.
-  FX_DWORD 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.
-  FX_DWORD dwDeltaGroupLen = hStream->GetBits(16);
-  CPDF_Object* pFirstPageObj = m_pLinearizedDict->GetElementValue("O");
-  int nFirstPageObjNum = pFirstPageObj ? pFirstPageObj->GetInteger() : -1;
-  if (nFirstPageObjNum < 0)
-    return FALSE;
-
-  FX_DWORD dwPrevObjLen = 0;
-  FX_DWORD dwCurObjLen = 0;
-  FX_SAFE_DWORD required_bits = dwSharedObjTotal;
-  required_bits *= dwDeltaGroupLen;
-  if (!CanReadFromBitStream(hStream, required_bits))
-    return FALSE;
-
-  for (FX_DWORD i = 0; i < dwSharedObjTotal; ++i) {
-    dwPrevObjLen = dwCurObjLen;
-    FX_SAFE_DWORD safeObjLen = hStream->GetBits(dwDeltaGroupLen);
-    safeObjLen += dwGroupLeastLen;
-    if (!safeObjLen.IsValid())
-      return FALSE;
-
-    dwCurObjLen = safeObjLen.ValueOrDie();
-    if (i < m_nFirstPageSharedObjs) {
-      m_dwSharedObjNumArray.Add(nFirstPageObjNum + i);
-      if (i == 0)
-        m_szSharedObjOffsetArray.push_back(m_szFirstPageObjOffset);
-    } else {
-      FX_SAFE_DWORD safeObjNum = dwFirstSharedObjNum;
-      safeObjNum += i - m_nFirstPageSharedObjs;
-      if (!safeObjNum.IsValid())
-        return FALSE;
-
-      m_dwSharedObjNumArray.Add(safeObjNum.ValueOrDie());
-      if (i == m_nFirstPageSharedObjs) {
-        m_szSharedObjOffsetArray.push_back(
-            pdfium::base::checked_cast<int32_t>(dwFirstSharedObjLoc));
-      }
-    }
-
-    if (i != 0 && i != m_nFirstPageSharedObjs) {
-      FX_SAFE_INT32 safeLoc = pdfium::base::checked_cast<int32_t>(dwPrevObjLen);
-      safeLoc += m_szSharedObjOffsetArray[i - 1];
-      if (!safeLoc.IsValid())
-        return FALSE;
-
-      m_szSharedObjOffsetArray.push_back(safeLoc.ValueOrDie());
-    }
-  }
-
-  if (dwSharedObjTotal > 0) {
-    FX_SAFE_INT32 safeLoc = pdfium::base::checked_cast<int32_t>(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;
-}
-
-FX_BOOL CPDF_HintTables::GetPagePos(int index,
-                                    FX_FILESIZE& szPageStartPos,
-                                    FX_FILESIZE& szPageLength,
-                                    FX_DWORD& dwObjNum) {
-  if (!m_pLinearizedDict)
-    return FALSE;
-
-  szPageStartPos = m_szPageOffsetArray[index];
-  szPageLength = GetItemLength(index, m_szPageOffsetArray);
-
-  CPDF_Object* pFirstPageNum = m_pLinearizedDict->GetElementValue("P");
-  int nFirstPageNum = pFirstPageNum ? pFirstPageNum->GetInteger() : 0;
-
-  CPDF_Object* pFirstPageObjNum = m_pLinearizedDict->GetElementValue("O");
-  if (!pFirstPageObjNum)
-    return FALSE;
-
-  int nFirstPageObjNum = pFirstPageObjNum->GetInteger();
-  if (index == nFirstPageNum) {
-    dwObjNum = nFirstPageObjNum;
-    return TRUE;
-  }
-
-  // The object number of remaining pages starts from 1.
-  dwObjNum = 1;
-  for (int i = 0; i < index; ++i) {
-    if (i == nFirstPageNum)
-      continue;
-    dwObjNum += m_dwDeltaNObjsArray[i];
-  }
-  return TRUE;
-}
-
-IPDF_DataAvail::DocAvailStatus CPDF_HintTables::CheckPage(
-    int index,
-    IPDF_DataAvail::DownloadHints* pHints) {
-  if (!m_pLinearizedDict || !pHints)
-    return IPDF_DataAvail::DataError;
-
-  CPDF_Object* pFirstAvailPage = m_pLinearizedDict->GetElementValue("P");
-  int nFirstAvailPage = pFirstAvailPage ? pFirstAvailPage->GetInteger() : 0;
-  if (index == nFirstAvailPage)
-    return IPDF_DataAvail::DataAvailable;
-
-  FX_DWORD dwLength = GetItemLength(index, m_szPageOffsetArray);
-  // If two pages have the same offset, it should be treated as an error.
-  if (!dwLength)
-    return IPDF_DataAvail::DataError;
-
-  if (!m_pDataAvail->IsDataAvail(m_szPageOffsetArray[index], dwLength, pHints))
-    return IPDF_DataAvail::DataNotAvailable;
-
-  // Download data of shared objects in the page.
-  FX_DWORD offset = 0;
-  for (int i = 0; i < index; ++i)
-    offset += m_dwNSharedObjsArray[i];
-
-  CPDF_Object* pFirstPageObj = m_pLinearizedDict->GetElementValue("O");
-  int nFirstPageObjNum = pFirstPageObj ? pFirstPageObj->GetInteger() : -1;
-  if (nFirstPageObjNum < 0)
-    return IPDF_DataAvail::DataError;
-
-  FX_DWORD dwIndex = 0;
-  FX_DWORD dwObjNum = 0;
-  for (int j = 0; j < m_dwNSharedObjsArray[index]; ++j) {
-    dwIndex = m_dwIdentifierArray[offset + j];
-    if (dwIndex >= m_dwSharedObjNumArray.GetSize())
-      return IPDF_DataAvail::DataNotAvailable;
-
-    dwObjNum = m_dwSharedObjNumArray[dwIndex];
-    if (dwObjNum >= nFirstPageObjNum &&
-        dwObjNum < 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 IPDF_DataAvail::DataError;
-
-    if (!m_pDataAvail->IsDataAvail(m_szSharedObjOffsetArray[dwIndex], dwLength,
-                                   pHints)) {
-      return IPDF_DataAvail::DataNotAvailable;
-    }
-  }
-  return IPDF_DataAvail::DataAvailable;
-}
-
-FX_BOOL CPDF_HintTables::LoadHintStream(CPDF_Stream* pHintStream) {
-  if (!pHintStream || !m_pLinearizedDict)
-    return FALSE;
-
-  CPDF_Dictionary* pDict = pHintStream->GetDict();
-  CPDF_Object* pOffset = pDict ? pDict->GetElement("S") : nullptr;
-  if (!pOffset || !pOffset->IsNumber())
-    return FALSE;
-
-  int shared_hint_table_offset = pOffset->GetInteger();
-  CPDF_StreamAcc acc;
-  acc.LoadAllData(pHintStream);
-
-  FX_DWORD 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 FX_DWORD MIN_STREAM_LEN = 60;
-  if (size < MIN_STREAM_LEN || shared_hint_table_offset <= 0 ||
-      size < shared_hint_table_offset) {
-    return FALSE;
-  }
-
-  CFX_BitStream bs;
-  bs.Init(acc.GetData(), size);
-  return ReadPageHintTable(&bs) &&
-         ReadSharedObjHintTable(&bs, pdfium::base::checked_cast<FX_DWORD>(
-                                         shared_hint_table_offset));
-}
-
-int CPDF_HintTables::ReadPrimaryHintStreamOffset() const {
-  if (!m_pLinearizedDict)
-    return -1;
-
-  CPDF_Array* pRange = m_pLinearizedDict->GetArrayBy("H");
-  if (!pRange)
-    return -1;
-
-  CPDF_Object* pStreamOffset = pRange->GetElementValue(0);
-  if (!pStreamOffset)
-    return -1;
-
-  return pStreamOffset->GetInteger();
-}
-
-int CPDF_HintTables::ReadPrimaryHintStreamLength() const {
-  if (!m_pLinearizedDict)
-    return -1;
-
-  CPDF_Array* pRange = m_pLinearizedDict->GetArrayBy("H");
-  if (!pRange)
-    return -1;
-
-  CPDF_Object* pStreamLen = pRange->GetElementValue(1);
-  if (!pStreamLen)
-    return -1;
-
-  return pStreamLen->GetInteger();
-}