Cleanup: Remove unused CPDF_Stream::Clone().

Cloning a CPDF_Stream actually happens via CPDF_Object::Clone().

Transitively, remove:
- GetStreamFilter()
-- all the filters.

R=jam@chromium.org

Review URL: https://codereview.chromium.org/1288543002 .

6 files changed, 2 insertions, 1177 deletions

diff --git a/core/include/fpdfapi/fpdf_objects.h b/core/include/fpdfapi/fpdf_objects.h
index 250b6e00d8..c2d838d35b 100644
--- a/core/include/fpdfapi/fpdf_objects.h
+++ b/core/include/fpdfapi/fpdf_objects.h
@@ -37,8 +37,6 @@ class IFX_FileRead;
 #define PDFOBJ_NULL 8
 #define PDFOBJ_REFERENCE 9
 
-typedef IFX_FileStream* (*FPDF_LPFCloneStreamCallback)(CPDF_Stream* pStream,
-                                                       void* pUserData);
 class CPDF_Object {
  public:
   int GetType() const { return m_Type; }
@@ -427,8 +425,6 @@ class CPDF_Stream : public CPDF_Object {
 
   FX_BOOL Identical(CPDF_Stream* pOther) const;
 
-  CPDF_StreamFilter* GetStreamFilter(FX_BOOL bRaw = FALSE) const;
-
   FX_DWORD GetRawSize() const { return m_dwSize; }
 
   FX_BOOL ReadRawData(FX_FILESIZE start_pos,
@@ -437,10 +433,6 @@ class CPDF_Stream : public CPDF_Object {
 
   FX_BOOL IsMemoryBased() const { return m_GenNum == (FX_DWORD)-1; }
 
-  CPDF_Stream* Clone(FX_BOOL bDirect,
-                     FPDF_LPFCloneStreamCallback lpfCallback,
-                     void* pUserData) const;
-
  protected:
   ~CPDF_Stream();
 
@@ -507,39 +499,7 @@ class CPDF_StreamAcc {
 
   uint8_t* m_pSrcData;
 };
-CFX_DataFilter* FPDF_CreateFilter(const CFX_ByteStringC& name,
-                                  const CPDF_Dictionary* pParam,
-                                  int width = 0,
-                                  int height = 0);
-#define FPDF_FILTER_BUFFER_SIZE 20480
-class CPDF_StreamFilter {
- public:
-  ~CPDF_StreamFilter();
-
-  FX_DWORD ReadBlock(uint8_t* buffer, FX_DWORD size);
-
-  FX_DWORD GetSrcPos() { return m_SrcOffset; }
-
-  const CPDF_Stream* GetStream() { return m_pStream; }
-
- protected:
-  CPDF_StreamFilter() {}
 
-  FX_DWORD ReadLeftOver(uint8_t* buffer, FX_DWORD buf_size);
-
-  const CPDF_Stream* m_pStream;
-
-  CFX_DataFilter* m_pFilter;
-
-  CFX_BinaryBuf* m_pBuffer;
-
-  FX_DWORD m_BufOffset;
-
-  FX_DWORD m_SrcOffset;
-
-  uint8_t m_SrcBuffer[FPDF_FILTER_BUFFER_SIZE];
-  friend class CPDF_Stream;
-};
 class CPDF_Null : public CPDF_Object {
  public:
   static CPDF_Null* Create() { return new CPDF_Null(); }
diff --git a/core/include/fxcrt/fx_basic.h b/core/include/fxcrt/fx_basic.h
index 73b99be549..cd6d4e048d 100644
--- a/core/include/fxcrt/fx_basic.h
+++ b/core/include/fxcrt/fx_basic.h
@@ -1032,36 +1032,6 @@ class IFX_Pause {
   virtual ~IFX_Pause() {}
   virtual FX_BOOL NeedToPauseNow() = 0;
 };
-class CFX_DataFilter {
- public:
-  virtual ~CFX_DataFilter();
-
-  void SetDestFilter(CFX_DataFilter* pFilter);
-
-  FX_BOOL IsEOF() const { return m_bEOF; }
-
-  FX_DWORD GetSrcPos() { return m_SrcPos; }
-
-  void FilterIn(const uint8_t* src_buf,
-                FX_DWORD src_size,
-                CFX_BinaryBuf& dest_buf);
-
-  void FilterFinish(CFX_BinaryBuf& dest_buf);
-
- protected:
-  CFX_DataFilter();
-  virtual void v_FilterIn(const uint8_t* src_buf,
-                          FX_DWORD src_size,
-                          CFX_BinaryBuf& dest_buf) = 0;
-  virtual void v_FilterFinish(CFX_BinaryBuf& dest_buf) = 0;
-  void ReportEOF(FX_DWORD left_input);
-
-  FX_BOOL m_bEOF;
-
-  FX_DWORD m_SrcPos;
-
-  CFX_DataFilter* m_pDestFilter;
-};
 
 template <typename T>
 class CFX_AutoRestorer {
diff --git a/core/src/fpdfapi/fpdf_page/pageint.h b/core/src/fpdfapi/fpdf_page/pageint.h
index c931af7eb2..bc03c3b5e6 100644
--- a/core/src/fpdfapi/fpdf_page/pageint.h
+++ b/core/src/fpdfapi/fpdf_page/pageint.h
@@ -366,7 +366,6 @@ class CPDF_ContentParser {
   FX_DWORD m_Size;
   class CPDF_StreamContentParser* m_pParser;
   FX_DWORD m_CurrentOffset;
-  CPDF_StreamFilter* m_pStreamFilter;
 };
 class CPDF_AllStates : public CPDF_GraphicStates {
  public:
diff --git a/core/src/fpdfapi/fpdf_parser/filters_int.h b/core/src/fpdfapi/fpdf_parser/filters_int.h
deleted file mode 100644
index 571801481d..0000000000
--- a/core/src/fpdfapi/fpdf_parser/filters_int.h
+++ /dev/null
@@ -1,145 +0,0 @@
-// Copyright 2014 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
-
-#ifndef CORE_SRC_FPDFAPI_FPDF_PARSER_FILTERS_INT_H_
-#define CORE_SRC_FPDFAPI_FPDF_PARSER_FILTERS_INT_H_
-
-class CPDF_DecryptFilter : public CFX_DataFilter {
- public:
-  CPDF_DecryptFilter(CPDF_CryptoHandler* pCryptoHandler,
-                     FX_DWORD objnum,
-                     FX_DWORD gennum);
-  virtual ~CPDF_DecryptFilter();
-  virtual void v_FilterIn(const uint8_t* src_buf,
-                          FX_DWORD src_size,
-                          CFX_BinaryBuf& dest_buf);
-  virtual void v_FilterFinish(CFX_BinaryBuf& dest_buf);
-  CPDF_CryptoHandler* m_pCryptoHandler;
-  void* m_pContext;
-  FX_DWORD m_ObjNum, m_GenNum;
-};
-class CPDF_FlateFilter : public CFX_DataFilter {
- public:
-  CPDF_FlateFilter();
-  virtual ~CPDF_FlateFilter();
-  virtual void v_FilterIn(const uint8_t* src_buf,
-                          FX_DWORD src_size,
-                          CFX_BinaryBuf& dest_buf);
-  virtual void v_FilterFinish(CFX_BinaryBuf& dest_buf) {}
-  void* m_pContext;
-  uint8_t m_DestBuffer[FPDF_FILTER_BUFFER_SIZE];
-};
-class CPDF_LzwFilter : public CFX_DataFilter {
- public:
-  CPDF_LzwFilter(FX_BOOL bEarlyChange);
-  virtual ~CPDF_LzwFilter() {}
-  virtual void v_FilterIn(const uint8_t* src_buf,
-                          FX_DWORD src_size,
-                          CFX_BinaryBuf& dest_buf);
-  virtual void v_FilterFinish(CFX_BinaryBuf& dest_buf) {}
-  FX_BOOL m_bEarlyChange;
-  FX_DWORD m_CodeArray[5021];
-  FX_DWORD m_nCodes;
-  FX_DWORD m_CodeLen;
-  FX_DWORD m_OldCode;
-  uint8_t m_LastChar;
-  FX_DWORD m_nLeftBits, m_LeftBits;
-  uint8_t m_DecodeStack[4000];
-  FX_DWORD m_StackLen;
-  void AddCode(FX_DWORD prefix_code, uint8_t append_char);
-  void DecodeString(FX_DWORD code);
-};
-class CPDF_PredictorFilter : public CFX_DataFilter {
- public:
-  CPDF_PredictorFilter(int predictor, int colors, int bpc, int cols);
-  virtual ~CPDF_PredictorFilter();
-  virtual void v_FilterIn(const uint8_t* src_buf,
-                          FX_DWORD src_size,
-                          CFX_BinaryBuf& dest_buf);
-  virtual void v_FilterFinish(CFX_BinaryBuf& dest_buf) {}
-  FX_BOOL m_bTiff;
-  FX_DWORD m_Pitch, m_Bpp;
-  uint8_t* m_pRefLine;
-  uint8_t* m_pCurLine;
-  FX_DWORD m_iLine, m_LineInSize;
-};
-class CPDF_AsciiHexFilter : public CFX_DataFilter {
- public:
-  CPDF_AsciiHexFilter();
-  virtual ~CPDF_AsciiHexFilter() {}
-  virtual void v_FilterIn(const uint8_t* src_buf,
-                          FX_DWORD src_size,
-                          CFX_BinaryBuf& dest_buf);
-  virtual void v_FilterFinish(CFX_BinaryBuf& dest_buf) {}
-  int m_State;
-  int m_FirstDigit;
-};
-class CPDF_Ascii85Filter : public CFX_DataFilter {
- public:
-  CPDF_Ascii85Filter();
-  virtual ~CPDF_Ascii85Filter() {}
-  virtual void v_FilterIn(const uint8_t* src_buf,
-                          FX_DWORD src_size,
-                          CFX_BinaryBuf& dest_buf);
-  virtual void v_FilterFinish(CFX_BinaryBuf& dest_buf) {}
-  int m_State;
-  int m_CharCount;
-  FX_DWORD m_CurDWord;
-};
-class CPDF_RunLenFilter : public CFX_DataFilter {
- public:
-  CPDF_RunLenFilter();
-  virtual ~CPDF_RunLenFilter() {}
-  virtual void v_FilterIn(const uint8_t* src_buf,
-                          FX_DWORD src_size,
-                          CFX_BinaryBuf& dest_buf);
-  virtual void v_FilterFinish(CFX_BinaryBuf& dest_buf) {}
-  int m_State;
-  FX_DWORD m_Count;
-};
-class CPDF_JpegFilter : public CFX_DataFilter {
- public:
-  CPDF_JpegFilter();
-  virtual ~CPDF_JpegFilter();
-  virtual void v_FilterIn(const uint8_t* src_buf,
-                          FX_DWORD src_size,
-                          CFX_BinaryBuf& dest_buf);
-  virtual void v_FilterFinish(CFX_BinaryBuf& dest_buf) {}
-  void* m_pContext;
-  CFX_BinaryBuf m_InputBuf;
-  uint8_t* m_pScanline;
-  int m_Pitch, m_Height, m_Width, m_nComps, m_iLine;
-  FX_BOOL m_bGotHeader;
-};
-class CPDF_FaxFilter : public CFX_DataFilter {
- public:
-  CPDF_FaxFilter();
-  virtual ~CPDF_FaxFilter();
-  FX_BOOL Initialize(int Encoding,
-                     int bEndOfLine,
-                     int bByteAlign,
-                     int bBlack,
-                     int nRows,
-                     int nColumns);
-  virtual void v_FilterIn(const uint8_t* src_buf,
-                          FX_DWORD src_size,
-                          CFX_BinaryBuf& dest_buf);
-  virtual void v_FilterFinish(CFX_BinaryBuf& dest_buf);
-  int m_Encoding, m_bEndOfLine, m_bByteAlign, m_bBlack;
-  int m_nRows, m_nColumns, m_Pitch, m_iRow;
-  uint8_t* m_pScanlineBuf;
-  uint8_t* m_pRefBuf;
-  CFX_BinaryBuf m_InputBuf;
-  int m_InputBitPos;
-  void ProcessData(const uint8_t* src_buf,
-                   FX_DWORD src_size,
-                   int& bitpos,
-                   FX_BOOL bFinish,
-                   CFX_BinaryBuf& dest_buf);
-  FX_BOOL ReadLine(const uint8_t* src_buf, int bitsize, int& bitpos);
-};
-
-#endif  // CORE_SRC_FPDFAPI_FPDF_PARSER_FILTERS_INT_H_
diff --git a/core/src/fpdfapi/fpdf_parser/fpdf_parser_filters.cpp b/core/src/fpdfapi/fpdf_parser/fpdf_parser_filters.cpp
deleted file mode 100644
index 8cb432029c..0000000000
--- a/core/src/fpdfapi/fpdf_parser/fpdf_parser_filters.cpp
+++ /dev/null
@@ -1,929 +0,0 @@
-// Copyright 2014 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 "../../../include/fpdfapi/fpdf_parser.h"
-#include "../../../include/fxcodec/fx_codec.h"
-#include "../../../include/fxcodec/fx_codec_flate.h"
-#include "../../../include/fpdfapi/fpdf_module.h"
-#include "filters_int.h"
-
-extern "C" {
-
-static void* my_alloc_func(void* opaque,
-                           unsigned int items,
-                           unsigned int size) {
-  return FX_Alloc2D(uint8_t, items, size);
-}
-static void my_free_func(void* opaque, void* address) {
-  FX_Free(address);
-}
-
-}  // extern "C"
-
-CFX_DataFilter::CFX_DataFilter() {
-  m_bEOF = FALSE;
-  m_pDestFilter = NULL;
-  m_SrcPos = 0;
-}
-CFX_DataFilter::~CFX_DataFilter() {
-  delete m_pDestFilter;
-}
-void CFX_DataFilter::SetDestFilter(CFX_DataFilter* pFilter) {
-  if (m_pDestFilter) {
-    m_pDestFilter->SetDestFilter(pFilter);
-  } else {
-    m_pDestFilter = pFilter;
-  }
-}
-void CFX_DataFilter::FilterIn(const uint8_t* src_buf,
-                              FX_DWORD src_size,
-                              CFX_BinaryBuf& dest_buf) {
-  if (m_bEOF) {
-    return;
-  }
-  m_SrcPos += src_size;
-  if (m_pDestFilter) {
-    CFX_BinaryBuf temp_buf;
-    temp_buf.EstimateSize(FPDF_FILTER_BUFFER_SIZE, FPDF_FILTER_BUFFER_SIZE);
-    v_FilterIn(src_buf, src_size, temp_buf);
-    m_pDestFilter->FilterIn(temp_buf.GetBuffer(), temp_buf.GetSize(), dest_buf);
-  } else {
-    v_FilterIn(src_buf, src_size, dest_buf);
-  }
-}
-void CFX_DataFilter::FilterFinish(CFX_BinaryBuf& dest_buf) {
-  if (m_pDestFilter) {
-    CFX_BinaryBuf temp_buf;
-    v_FilterFinish(temp_buf);
-    if (temp_buf.GetSize()) {
-      m_pDestFilter->FilterIn(temp_buf.GetBuffer(), temp_buf.GetSize(),
-                              dest_buf);
-    }
-    m_pDestFilter->FilterFinish(dest_buf);
-  } else {
-    v_FilterFinish(dest_buf);
-  }
-  m_bEOF = TRUE;
-}
-void CFX_DataFilter::ReportEOF(FX_DWORD left_input) {
-  if (m_bEOF) {
-    return;
-  }
-  m_bEOF = TRUE;
-  m_SrcPos -= left_input;
-}
-CFX_DataFilter* FPDF_CreateFilter(const CFX_ByteStringC& name,
-                                  const CPDF_Dictionary* pParam,
-                                  int width,
-                                  int height) {
-  FX_DWORD id = name.GetID();
-  switch (id) {
-    case FXBSTR_ID('F', 'l', 'a', 't'):
-    case FXBSTR_ID('F', 'l', 0, 0):
-    case FXBSTR_ID('L', 'Z', 'W', 'D'):
-    case FXBSTR_ID('L', 'Z', 'W', 0): {
-      CFX_DataFilter* pFilter;
-      if (id == FXBSTR_ID('L', 'Z', 'W', 'D') ||
-          id == FXBSTR_ID('L', 'Z', 'W', 0)) {
-        pFilter = new CPDF_LzwFilter(
-            pParam ? pParam->GetInteger("EarlyChange", 1) : 1);
-      } else {
-        pFilter = new CPDF_FlateFilter;
-      }
-      if ((pParam ? pParam->GetInteger("Predictor", 1) : 1) > 1) {
-        CFX_DataFilter* pPredictor = new CPDF_PredictorFilter(
-            pParam->GetInteger(FX_BSTRC("Predictor"), 1),
-            pParam->GetInteger(FX_BSTRC("Colors"), 1),
-            pParam->GetInteger(FX_BSTRC("BitsPerComponent"), 8),
-            pParam->GetInteger(FX_BSTRC("Columns"), 1));
-        pFilter->SetDestFilter(pPredictor);
-      }
-      return pFilter;
-    }
-    case FXBSTR_ID('A', 'S', 'C', 'I'):
-      if (name == "ASCIIHexDecode") {
-        return new CPDF_AsciiHexFilter;
-      }
-      return new CPDF_Ascii85Filter;
-    case FXBSTR_ID('A', 'H', 'x', 0):
-      return new CPDF_AsciiHexFilter;
-    case FXBSTR_ID('A', '8', '5', 0):
-      return new CPDF_Ascii85Filter;
-    case FXBSTR_ID('R', 'u', 'n', 'L'):
-      return new CPDF_RunLenFilter;
-    case FXBSTR_ID('C', 'C', 'I', 'T'): {
-      int Encoding = 0;
-      int bEndOfLine = FALSE;
-      int bByteAlign = FALSE;
-      int bBlack = FALSE;
-      int nRows = 0;
-      int nColumns = 1728;
-      if (pParam) {
-        Encoding = pParam->GetInteger(FX_BSTRC("K"));
-        bEndOfLine = pParam->GetInteger(FX_BSTRC("EndOfLine"));
-        bByteAlign = pParam->GetInteger(FX_BSTRC("EncodedByteAlign"));
-        bBlack = pParam->GetInteger(FX_BSTRC("BlackIs1"));
-        nColumns = pParam->GetInteger(FX_BSTRC("Columns"), 1728);
-        nRows = pParam->GetInteger(FX_BSTRC("Rows"));
-      }
-      if (nColumns == 0) {
-        nColumns = width;
-      }
-      if (nRows == 0) {
-        nRows = height;
-      }
-      CPDF_FaxFilter* pFilter = new CPDF_FaxFilter();
-      pFilter->Initialize(Encoding, bEndOfLine, bByteAlign, bBlack, nRows,
-                          nColumns);
-      return pFilter;
-    }
-    case FXBSTR_ID('D', 'C', 'T', 'D'):
-      return new CPDF_JpegFilter;
-    default:
-      return NULL;
-  }
-}
-CFX_DataFilter* _FPDF_CreateFilterFromDict(CPDF_Dictionary* pDict) {
-  CPDF_Object* pDecoder = pDict->GetElementValue("Filter");
-  if (pDecoder == NULL) {
-    return NULL;
-  }
-  CFX_DataFilter* pFirstFilter = NULL;
-  int width = pDict->GetInteger(FX_BSTRC("Width")),
-      height = pDict->GetInteger(FX_BSTRC("Height"));
-  CPDF_Object* pParams = pDict->GetElementValue("DecodeParms");
-  if (pDecoder->GetType() == PDFOBJ_ARRAY) {
-    if (pParams && pParams->GetType() != PDFOBJ_ARRAY) {
-      pParams = NULL;
-    }
-    for (FX_DWORD i = 0; i < ((CPDF_Array*)pDecoder)->GetCount(); i++) {
-      CFX_ByteString name = ((CPDF_Array*)pDecoder)->GetString(i);
-      CPDF_Dictionary* pParam = NULL;
-      if (pParams) {
-        pParam = ((CPDF_Array*)pParams)->GetDict(i);
-      }
-      CFX_DataFilter* pDestFilter =
-          FPDF_CreateFilter(name, pParam, width, height);
-      if (pDestFilter) {
-        if (pFirstFilter == NULL) {
-          pFirstFilter = pDestFilter;
-        } else {
-          pFirstFilter->SetDestFilter(pDestFilter);
-        }
-      }
-    }
-  } else {
-    if (pParams && pParams->GetType() != PDFOBJ_DICTIONARY) {
-      pParams = NULL;
-    }
-    pFirstFilter = FPDF_CreateFilter(pDecoder->GetString(),
-                                     (CPDF_Dictionary*)pParams, width, height);
-  }
-  return pFirstFilter;
-}
-CPDF_StreamFilter* CPDF_Stream::GetStreamFilter(FX_BOOL bRaw) const {
-  CFX_DataFilter* pFirstFilter = NULL;
-  if (m_pCryptoHandler) {
-    pFirstFilter = new CPDF_DecryptFilter(m_pCryptoHandler, m_ObjNum, m_GenNum);
-  }
-  if (!bRaw) {
-    CFX_DataFilter* pFilter = _FPDF_CreateFilterFromDict(m_pDict);
-    if (pFilter) {
-      if (pFirstFilter == NULL) {
-        pFirstFilter = pFilter;
-      } else {
-        pFirstFilter->SetDestFilter(pFilter);
-      }
-    }
-  }
-  CPDF_StreamFilter* pStreamFilter = new CPDF_StreamFilter;
-  pStreamFilter->m_pStream = this;
-  pStreamFilter->m_pFilter = pFirstFilter;
-  pStreamFilter->m_pBuffer = NULL;
-  pStreamFilter->m_SrcOffset = 0;
-  return pStreamFilter;
-}
-CPDF_StreamFilter::~CPDF_StreamFilter() {
-  delete m_pFilter;
-  delete m_pBuffer;
-}
-#define FPDF_FILTER_BUFFER_IN_SIZE FPDF_FILTER_BUFFER_SIZE
-FX_DWORD CPDF_StreamFilter::ReadBlock(uint8_t* buffer, FX_DWORD buf_size) {
-  if (m_pFilter == NULL) {
-    FX_DWORD read_size = m_pStream->GetRawSize() - m_SrcOffset;
-    if (read_size == 0) {
-      return 0;
-    }
-    if (read_size > buf_size) {
-      read_size = buf_size;
-    }
-    m_pStream->ReadRawData(m_SrcOffset, buffer, read_size);
-    m_SrcOffset += read_size;
-    return read_size;
-  }
-  FX_DWORD read_size = 0;
-  if (m_pBuffer) {
-    read_size = ReadLeftOver(buffer, buf_size);
-    if (read_size == buf_size) {
-      return read_size;
-    }
-    buffer += read_size;
-    buf_size -= read_size;
-  }
-  ASSERT(m_pBuffer == NULL);
-  if (m_pFilter->IsEOF()) {
-    return read_size;
-  }
-  m_pBuffer = new CFX_BinaryBuf;
-  m_pBuffer->EstimateSize(FPDF_FILTER_BUFFER_SIZE, FPDF_FILTER_BUFFER_SIZE);
-  m_BufOffset = 0;
-  while (1) {
-    int src_size = m_pStream->GetRawSize() - m_SrcOffset;
-    if (src_size == 0) {
-      m_pFilter->FilterFinish(*m_pBuffer);
-      break;
-    }
-    if (src_size > FPDF_FILTER_BUFFER_IN_SIZE) {
-      src_size = FPDF_FILTER_BUFFER_IN_SIZE;
-    }
-    if (!m_pStream->ReadRawData(m_SrcOffset, m_SrcBuffer, src_size)) {
-      return 0;
-    }
-    m_SrcOffset += src_size;
-    m_pFilter->FilterIn(m_SrcBuffer, src_size, *m_pBuffer);
-    if (m_pBuffer->GetSize() >= (int)buf_size) {
-      break;
-    }
-  }
-  return read_size + ReadLeftOver(buffer, buf_size);
-}
-FX_DWORD CPDF_StreamFilter::ReadLeftOver(uint8_t* buffer, FX_DWORD buf_size) {
-  FX_DWORD read_size = m_pBuffer->GetSize() - m_BufOffset;
-  if (read_size > buf_size) {
-    read_size = buf_size;
-  }
-  FXSYS_memcpy(buffer, m_pBuffer->GetBuffer() + m_BufOffset, read_size);
-  m_BufOffset += read_size;
-  if (m_BufOffset == (FX_DWORD)m_pBuffer->GetSize()) {
-    delete m_pBuffer;
-    m_pBuffer = NULL;
-  }
-  return read_size;
-}
-CPDF_DecryptFilter::CPDF_DecryptFilter(CPDF_CryptoHandler* pCryptoHandler,
-                                       FX_DWORD objnum,
-                                       FX_DWORD gennum) {
-  m_pCryptoHandler = pCryptoHandler;
-  m_pContext = NULL;
-  m_ObjNum = objnum;
-  m_GenNum = gennum;
-}
-CPDF_DecryptFilter::~CPDF_DecryptFilter() {
-  CFX_BinaryBuf buf;
-  if (m_pContext) {
-    m_pCryptoHandler->DecryptFinish(m_pContext, buf);
-  }
-}
-void CPDF_DecryptFilter::v_FilterIn(const uint8_t* src_buf,
-                                    FX_DWORD src_size,
-                                    CFX_BinaryBuf& dest_buf) {
-  if (m_pContext == NULL) {
-    m_pContext = m_pCryptoHandler->DecryptStart(m_ObjNum, m_GenNum);
-  }
-  m_pCryptoHandler->DecryptStream(m_pContext, src_buf, src_size, dest_buf);
-}
-void CPDF_DecryptFilter::v_FilterFinish(CFX_BinaryBuf& dest_buf) {
-  m_bEOF = TRUE;
-  if (m_pContext == NULL) {
-    return;
-  }
-  m_pCryptoHandler->DecryptFinish(m_pContext, dest_buf);
-  m_pContext = NULL;
-}
-CPDF_FlateFilter::CPDF_FlateFilter() {
-  m_pContext = NULL;
-}
-CPDF_FlateFilter::~CPDF_FlateFilter() {
-  if (m_pContext) {
-    FPDFAPI_FlateEnd(m_pContext);
-  }
-}
-void CPDF_FlateFilter::v_FilterIn(const uint8_t* src_buf,
-                                  FX_DWORD src_size,
-                                  CFX_BinaryBuf& dest_buf) {
-  if (m_pContext == NULL) {
-    m_pContext = FPDFAPI_FlateInit(my_alloc_func, my_free_func);
-  }
-  FPDFAPI_FlateInput(m_pContext, src_buf, src_size);
-  while (1) {
-    int ret =
-        FPDFAPI_FlateOutput(m_pContext, m_DestBuffer, FPDF_FILTER_BUFFER_SIZE);
-    int out_size =
-        FPDF_FILTER_BUFFER_SIZE - FPDFAPI_FlateGetAvailOut(m_pContext);
-    dest_buf.AppendBlock(m_DestBuffer, out_size);
-    if (ret == Z_BUF_ERROR) {
-      break;
-    }
-    if (ret != Z_OK) {
-      ReportEOF(FPDFAPI_FlateGetAvailIn(m_pContext));
-      break;
-    }
-  }
-}
-CPDF_LzwFilter::CPDF_LzwFilter(FX_BOOL bEarlyChange) {
-  m_bEarlyChange = bEarlyChange ? 1 : 0;
-  m_CodeLen = 9;
-  m_nCodes = 0;
-  m_nLeftBits = 0;
-  m_LeftBits = 0;
-  m_OldCode = (FX_DWORD)-1;
-}
-void CPDF_LzwFilter::v_FilterIn(const uint8_t* src_buf,
-                                FX_DWORD src_size,
-                                CFX_BinaryBuf& dest_buf) {
-  for (FX_DWORD i = 0; i < src_size; i++) {
-    if (m_nLeftBits + 8 < m_CodeLen) {
-      m_nLeftBits += 8;
-      m_LeftBits = (m_LeftBits << 8) | src_buf[i];
-      continue;
-    }
-    FX_DWORD new_bits = m_CodeLen - m_nLeftBits;
-    FX_DWORD code = (m_LeftBits << new_bits) | (src_buf[i] >> (8 - new_bits));
-    m_nLeftBits = 8 - new_bits;
-    m_LeftBits = src_buf[i] % (1 << m_nLeftBits);
-    if (code < 256) {
-      dest_buf.AppendByte((uint8_t)code);
-      m_LastChar = (uint8_t)code;
-      if (m_OldCode != -1) {
-        AddCode(m_OldCode, m_LastChar);
-      }
-      m_OldCode = code;
-    } else if (code == 256) {
-      m_CodeLen = 9;
-      m_nCodes = 0;
-      m_OldCode = (FX_DWORD)-1;
-    } else if (code == 257) {
-      ReportEOF(src_size - i - 1);
-      return;
-    } else {
-      if (m_OldCode == -1) {
-        ReportEOF(src_size - i - 1);
-        return;
-      }
-      m_StackLen = 0;
-      if (code >= m_nCodes + 258) {
-        if (m_StackLen < sizeof(m_DecodeStack)) {
-          m_DecodeStack[m_StackLen++] = m_LastChar;
-        }
-        DecodeString(m_OldCode);
-      } else {
-        DecodeString(code);
-      }
-      dest_buf.AppendBlock(NULL, m_StackLen);
-      uint8_t* pOutput = dest_buf.GetBuffer() + dest_buf.GetSize() - m_StackLen;
-      for (FX_DWORD cc = 0; cc < m_StackLen; cc++) {
-        pOutput[cc] = m_DecodeStack[m_StackLen - cc - 1];
-      }
-      m_LastChar = m_DecodeStack[m_StackLen - 1];
-      if (m_OldCode < 256) {
-        AddCode(m_OldCode, m_LastChar);
-      } else if (m_OldCode - 258 >= m_nCodes) {
-        ReportEOF(src_size - i - 1);
-        return;
-      } else {
-        AddCode(m_OldCode, m_LastChar);
-      }
-      m_OldCode = code;
-    }
-  }
-}
-void CPDF_LzwFilter::AddCode(FX_DWORD prefix_code, uint8_t append_char) {
-  if (m_nCodes + m_bEarlyChange == 4094) {
-    return;
-  }
-  m_CodeArray[m_nCodes++] = (prefix_code << 16) | append_char;
-  if (m_nCodes + m_bEarlyChange == 512 - 258) {
-    m_CodeLen = 10;
-  } else if (m_nCodes + m_bEarlyChange == 1024 - 258) {
-    m_CodeLen = 11;
-  } else if (m_nCodes + m_bEarlyChange == 2048 - 258) {
-    m_CodeLen = 12;
-  }
-}
-void CPDF_LzwFilter::DecodeString(FX_DWORD code) {
-  while (1) {
-    int index = code - 258;
-    if (index < 0 || index >= (int)m_nCodes) {
-      break;
-    }
-    FX_DWORD data = m_CodeArray[index];
-    if (m_StackLen >= sizeof(m_DecodeStack)) {
-      return;
-    }
-    m_DecodeStack[m_StackLen++] = (uint8_t)data;
-    code = data >> 16;
-  }
-  if (m_StackLen >= sizeof(m_DecodeStack)) {
-    return;
-  }
-  m_DecodeStack[m_StackLen++] = (uint8_t)code;
-}
-CPDF_PredictorFilter::CPDF_PredictorFilter(int predictor,
-                                           int colors,
-                                           int bpc,
-                                           int cols) {
-  m_bTiff = predictor < 10;
-  m_pRefLine = NULL;
-  m_pCurLine = NULL;
-  m_iLine = 0;
-  m_LineInSize = 0;
-  m_Bpp = (colors * bpc + 7) / 8;
-  m_Pitch = (colors * bpc * cols + 7) / 8;
-  if (!m_bTiff) {
-    m_Pitch++;
-  }
-}
-CPDF_PredictorFilter::~CPDF_PredictorFilter() {
-  if (m_pCurLine) {
-    FX_Free(m_pCurLine);
-  }
-  if (m_pRefLine) {
-    FX_Free(m_pRefLine);
-  }
-}
-static uint8_t PaethPredictor(int a, int b, int c) {
-  int p = a + b - c;
-  int pa = FXSYS_abs(p - a);
-  int pb = FXSYS_abs(p - b);
-  int pc = FXSYS_abs(p - c);
-  if (pa <= pb && pa <= pc) {
-    return (uint8_t)a;
-  }
-  if (pb <= pc) {
-    return (uint8_t)b;
-  }
-  return (uint8_t)c;
-}
-static void PNG_PredictorLine(uint8_t* cur_buf,
-                              uint8_t* ref_buf,
-                              int pitch,
-                              int Bpp) {
-  uint8_t tag = cur_buf[0];
-  if (tag == 0) {
-    return;
-  }
-  cur_buf++;
-  if (ref_buf) {
-    ref_buf++;
-  }
-  for (int byte = 0; byte < pitch; byte++) {
-    uint8_t raw_byte = cur_buf[byte];
-    switch (tag) {
-      case 1: {
-        uint8_t left = 0;
-        if (byte >= Bpp) {
-          left = cur_buf[byte - Bpp];
-        }
-        cur_buf[byte] = raw_byte + left;
-        break;
-      }
-      case 2: {
-        uint8_t up = 0;
-        if (ref_buf) {
-          up = ref_buf[byte];
-        }
-        cur_buf[byte] = raw_byte + up;
-        break;
-      }
-      case 3: {
-        uint8_t left = 0;
-        if (byte >= Bpp) {
-          left = cur_buf[byte - Bpp];
-        }
-        uint8_t up = 0;
-        if (ref_buf) {
-          up = ref_buf[byte];
-        }
-        cur_buf[byte] = raw_byte + (up + left) / 2;
-        break;
-      }
-      case 4: {
-        uint8_t left = 0;
-        if (byte >= Bpp) {
-          left = cur_buf[byte - Bpp];
-        }
-        uint8_t up = 0;
-        if (ref_buf) {
-          up = ref_buf[byte];
-        }
-        uint8_t upper_left = 0;
-        if (byte >= Bpp && ref_buf) {
-          upper_left = ref_buf[byte - Bpp];
-        }
-        cur_buf[byte] = raw_byte + PaethPredictor(left, up, upper_left);
-        break;
-      }
-    }
-  }
-}
-void CPDF_PredictorFilter::v_FilterIn(const uint8_t* src_buf,
-                                      FX_DWORD src_size,
-                                      CFX_BinaryBuf& dest_buf) {
-  if (m_pCurLine == NULL) {
-    m_pCurLine = FX_Alloc(uint8_t, m_Pitch);
-    if (!m_bTiff) {
-      m_pRefLine = FX_Alloc(uint8_t, m_Pitch);
-    }
-  }
-  while (1) {
-    FX_DWORD read_size = m_Pitch - m_LineInSize;
-    if (read_size > src_size) {
-      read_size = src_size;
-    }
-    FXSYS_memcpy(m_pCurLine + m_LineInSize, src_buf, read_size);
-    m_LineInSize += read_size;
-    if (m_LineInSize < m_Pitch) {
-      break;
-    }
-    src_buf += read_size;
-    src_size -= read_size;
-    if (m_bTiff) {
-      for (FX_DWORD byte = m_Bpp; byte < m_Pitch; byte++) {
-        m_pCurLine[byte] += m_pCurLine[byte - m_Bpp];
-      }
-      dest_buf.AppendBlock(m_pCurLine, m_Pitch);
-    } else {
-      PNG_PredictorLine(m_pCurLine, m_iLine ? m_pRefLine : NULL, m_Pitch - 1,
-                        m_Bpp);
-      dest_buf.AppendBlock(m_pCurLine + 1, m_Pitch - 1);
-      m_iLine++;
-      uint8_t* temp = m_pCurLine;
-      m_pCurLine = m_pRefLine;
-      m_pRefLine = temp;
-    }
-    m_LineInSize = 0;
-  }
-}
-CPDF_Ascii85Filter::CPDF_Ascii85Filter() {
-  m_State = 0;
-  m_CharCount = 0;
-}
-void CPDF_Ascii85Filter::v_FilterIn(const uint8_t* src_buf,
-                                    FX_DWORD src_size,
-                                    CFX_BinaryBuf& dest_buf) {
-  for (FX_DWORD i = 0; i < src_size; i++) {
-    uint8_t byte = src_buf[i];
-    if (PDF_CharType[byte] == 'W') {
-      continue;
-    }
-    switch (m_State) {
-      case 0:
-        if (byte >= '!' && byte <= 'u') {
-          int digit = byte - '!';
-          m_CurDWord = digit;
-          m_CharCount = 1;
-          m_State = 1;
-        } else if (byte == 'z') {
-          int zero = 0;
-          dest_buf.AppendBlock(&zero, 4);
-        } else if (byte == '~') {
-          m_State = 2;
-        }
-        break;
-      case 1: {
-        if (byte >= '!' && byte <= 'u') {
-          int digit = byte - '!';
-          m_CurDWord = m_CurDWord * 85 + digit;
-          m_CharCount++;
-          if (m_CharCount == 5) {
-            for (int i = 0; i < 4; i++) {
-              dest_buf.AppendByte((uint8_t)(m_CurDWord >> (3 - i) * 8));
-            }
-            m_State = 0;
-          }
-        } else if (byte == '~') {
-          if (m_CharCount > 1) {
-            int i;
-            for (i = m_CharCount; i < 5; i++) {
-              m_CurDWord = m_CurDWord * 85 + 84;
-            }
-            for (i = 0; i < m_CharCount - 1; i++) {
-              dest_buf.AppendByte((uint8_t)(m_CurDWord >> (3 - i) * 8));
-            }
-          }
-          m_State = 2;
-        }
-        break;
-      }
-      case 2:
-        if (byte == '>') {
-          ReportEOF(src_size - i - 1);
-          return;
-        }
-        break;
-    }
-  }
-}
-CPDF_AsciiHexFilter::CPDF_AsciiHexFilter() {
-  m_State = 0;
-}
-void CPDF_AsciiHexFilter::v_FilterIn(const uint8_t* src_buf,
-                                     FX_DWORD src_size,
-                                     CFX_BinaryBuf& dest_buf) {
-  for (FX_DWORD i = 0; i < src_size; i++) {
-    uint8_t byte = src_buf[i];
-    if (PDF_CharType[byte] == 'W') {
-      continue;
-    }
-    int digit;
-    if (byte >= '0' && byte <= '9') {
-      digit = byte - '0';
-    } else if (byte >= 'a' && byte <= 'f') {
-      digit = byte - 'a' + 10;
-    } else if (byte >= 'A' && byte <= 'F') {
-      digit = byte - 'A' + 10;
-    } else {
-      if (m_State) {
-        dest_buf.AppendByte(m_FirstDigit * 16);
-      }
-      ReportEOF(src_size - i - 1);
-      return;
-    }
-    if (m_State == 0) {
-      m_FirstDigit = digit;
-      m_State++;
-    } else {
-      dest_buf.AppendByte(m_FirstDigit * 16 + digit);
-      m_State--;
-    }
-  }
-}
-CPDF_RunLenFilter::CPDF_RunLenFilter() {
-  m_State = 0;
-  m_Count = 0;
-}
-void CPDF_RunLenFilter::v_FilterIn(const uint8_t* src_buf,
-                                   FX_DWORD src_size,
-                                   CFX_BinaryBuf& dest_buf) {
-  for (FX_DWORD i = 0; i < src_size; i++) {
-    uint8_t byte = src_buf[i];
-    switch (m_State) {
-      case 0:
-        if (byte < 128) {
-          m_State = 1;
-          m_Count = byte + 1;
-        } else if (byte == 128) {
-          ReportEOF(src_size - i - 1);
-          return;
-        } else {
-          m_State = 2;
-          m_Count = 257 - byte;
-        }
-        break;
-      case 1:
-        dest_buf.AppendByte(byte);
-        m_Count--;
-        if (m_Count == 0) {
-          m_State = 0;
-        }
-        break;
-      case 2: {
-        dest_buf.AppendBlock(NULL, m_Count);
-        FXSYS_memset(dest_buf.GetBuffer() + dest_buf.GetSize() - m_Count, byte,
-                     m_Count);
-        m_State = 0;
-        break;
-      }
-    }
-  }
-}
-CPDF_JpegFilter::CPDF_JpegFilter() {
-  m_pContext = NULL;
-  m_bGotHeader = FALSE;
-  m_pScanline = NULL;
-  m_iLine = 0;
-}
-CPDF_JpegFilter::~CPDF_JpegFilter() {
-  if (m_pScanline) {
-    FX_Free(m_pScanline);
-  }
-  if (m_pContext) {
-    CPDF_ModuleMgr::Get()->GetJpegModule()->Finish(m_pContext);
-  }
-}
-void CPDF_JpegFilter::v_FilterIn(const uint8_t* src_buf,
-                                 FX_DWORD src_size,
-                                 CFX_BinaryBuf& dest_buf) {
-  if (m_pContext == NULL) {
-    m_pContext = CPDF_ModuleMgr::Get()->GetJpegModule()->Start();
-  }
-  const uint8_t* jpeg_src_buf;
-  FX_DWORD jpeg_src_size;
-  CFX_BinaryBuf temp_buf;
-  if (m_InputBuf.GetSize()) {
-    temp_buf.EstimateSize(m_InputBuf.GetSize() + src_size);
-    temp_buf.AppendBlock(m_InputBuf.GetBuffer(), m_InputBuf.GetSize());
-    m_InputBuf.Clear();
-    temp_buf.AppendBlock(src_buf, src_size);
-    jpeg_src_buf = temp_buf.GetBuffer();
-    jpeg_src_size = temp_buf.GetSize();
-  } else {
-    jpeg_src_buf = src_buf;
-    jpeg_src_size = src_size;
-  }
-  CPDF_ModuleMgr::Get()->GetJpegModule()->Input(m_pContext, jpeg_src_buf,
-                                                jpeg_src_size);
-  if (!m_bGotHeader) {
-    int ret = CPDF_ModuleMgr::Get()->GetJpegModule()->ReadHeader(
-        m_pContext, &m_Width, &m_Height, &m_nComps);
-    int left_size =
-        CPDF_ModuleMgr::Get()->GetJpegModule()->GetAvailInput(m_pContext);
-    if (ret == 1) {
-      ReportEOF(left_size);
-      return;
-    }
-    if (ret == 2) {
-      m_InputBuf.AppendBlock(jpeg_src_buf + jpeg_src_size - left_size,
-                             left_size);
-      return;
-    }
-    CPDF_ModuleMgr::Get()->GetJpegModule()->StartScanline(m_pContext, 1);
-    m_bGotHeader = TRUE;
-    m_Pitch = m_Width * m_nComps;
-  }
-  if (m_pScanline == NULL) {
-    m_pScanline = FX_Alloc(uint8_t, m_Pitch + 4);
-  }
-  while (1) {
-    if (!CPDF_ModuleMgr::Get()->GetJpegModule()->ReadScanline(m_pContext,
-                                                              m_pScanline)) {
-      int left_size =
-          CPDF_ModuleMgr::Get()->GetJpegModule()->GetAvailInput(m_pContext);
-      m_InputBuf.AppendBlock(jpeg_src_buf + jpeg_src_size - left_size,
-                             left_size);
-      break;
-    }
-    dest_buf.AppendBlock(m_pScanline, m_Pitch);
-    m_iLine++;
-    if (m_iLine == m_Height) {
-      ReportEOF(
-          CPDF_ModuleMgr::Get()->GetJpegModule()->GetAvailInput(m_pContext));
-      return;
-    }
-  }
-}
-CPDF_FaxFilter::CPDF_FaxFilter() {
-  m_Encoding = 0;
-  m_bEndOfLine = FALSE;
-  m_bByteAlign = FALSE;
-  m_bBlack = FALSE;
-  m_nRows = 0;
-  m_nColumns = 0;
-  m_Pitch = 0;
-  m_pScanlineBuf = NULL;
-  m_pRefBuf = NULL;
-  m_iRow = 0;
-  m_InputBitPos = 0;
-}
-CPDF_FaxFilter::~CPDF_FaxFilter() {
-  if (m_pScanlineBuf) {
-    FX_Free(m_pScanlineBuf);
-  }
-  if (m_pRefBuf) {
-    FX_Free(m_pRefBuf);
-  }
-}
-FX_BOOL CPDF_FaxFilter::Initialize(int Encoding,
-                                   int bEndOfLine,
-                                   int bByteAlign,
-                                   int bBlack,
-                                   int nRows,
-                                   int nColumns) {
-  m_Encoding = Encoding;
-  m_bEndOfLine = bEndOfLine;
-  m_bByteAlign = bByteAlign;
-  m_bBlack = bBlack;
-  m_nRows = nRows;
-  m_nColumns = nColumns;
-  m_Pitch = (m_nColumns + 7) / 8;
-  m_pScanlineBuf = FX_Alloc(uint8_t, m_Pitch);
-  m_pRefBuf = FX_Alloc(uint8_t, m_Pitch);
-  FXSYS_memset(m_pScanlineBuf, 0xff, m_Pitch);
-  FXSYS_memset(m_pRefBuf, 0xff, m_Pitch);
-  m_iRow = 0;
-  m_InputBitPos = 0;
-  return TRUE;
-}
-void CPDF_FaxFilter::v_FilterIn(const uint8_t* src_buf,
-                                FX_DWORD src_size,
-                                CFX_BinaryBuf& dest_buf) {
-  const uint8_t* fax_src_buf;
-  FX_DWORD fax_src_size;
-  CFX_BinaryBuf temp_buf;
-  int bitpos;
-  if (m_InputBuf.GetSize()) {
-    temp_buf.EstimateSize(m_InputBuf.GetSize() + src_size);
-    temp_buf.AppendBlock(m_InputBuf.GetBuffer(), m_InputBuf.GetSize());
-    m_InputBuf.Clear();
-    temp_buf.AppendBlock(src_buf, src_size);
-    fax_src_buf = temp_buf.GetBuffer();
-    fax_src_size = temp_buf.GetSize();
-    bitpos = m_InputBitPos;
-  } else {
-    fax_src_buf = src_buf;
-    fax_src_size = src_size;
-    bitpos = 0;
-  }
-  ProcessData(fax_src_buf, fax_src_size, bitpos, FALSE, dest_buf);
-  int left_bits = fax_src_size * 8 - bitpos;
-  m_InputBuf.AppendBlock(fax_src_buf + bitpos / 8, (left_bits + 7) / 8);
-  m_InputBitPos = bitpos % 8;
-}
-void CPDF_FaxFilter::v_FilterFinish(CFX_BinaryBuf& dest_buf) {
-  ProcessData(m_InputBuf.GetBuffer(), m_InputBuf.GetSize(), m_InputBitPos, TRUE,
-              dest_buf);
-}
-FX_BOOL _FaxSkipEOL(const uint8_t* src_buf, int bitsize, int& bitpos);
-FX_BOOL _FaxG4GetRow(const uint8_t* src_buf,
-                     int bitsize,
-                     int& bitpos,
-                     uint8_t* dest_buf,
-                     const uint8_t* ref_buf,
-                     int columns);
-FX_BOOL _FaxGet1DLine(const uint8_t* src_buf,
-                      int bitsize,
-                      int& bitpos,
-                      uint8_t* dest_buf,
-                      int columns);
-void CPDF_FaxFilter::ProcessData(const uint8_t* src_buf,
-                                 FX_DWORD src_size,
-                                 int& bitpos,
-                                 FX_BOOL bFinish,
-                                 CFX_BinaryBuf& dest_buf) {
-  int bitsize = src_size * 8;
-  while (1) {
-    if ((bitsize < bitpos + 256) && !bFinish) {
-      return;
-    }
-    int start_bitpos = bitpos;
-    FXSYS_memset(m_pScanlineBuf, 0xff, m_Pitch);
-    if (!ReadLine(src_buf, bitsize, bitpos)) {
-      bitpos = start_bitpos;
-      return;
-    }
-    if (m_Encoding) {
-      FXSYS_memcpy(m_pRefBuf, m_pScanlineBuf, m_Pitch);
-    }
-    if (m_bBlack) {
-      for (int i = 0; i < m_Pitch; i++) {
-        m_pScanlineBuf[i] = ~m_pScanlineBuf[i];
-      }
-    }
-    dest_buf.AppendBlock(m_pScanlineBuf, m_Pitch);
-    m_iRow++;
-    if (m_iRow == m_nRows) {
-      ReportEOF(src_size - (bitpos + 7) / 8);
-      return;
-    }
-  }
-}
-FX_BOOL CPDF_FaxFilter::ReadLine(const uint8_t* src_buf,
-                                 int bitsize,
-                                 int& bitpos) {
-  if (!_FaxSkipEOL(src_buf, bitsize, bitpos)) {
-    return FALSE;
-  }
-  FX_BOOL ret;
-  if (m_Encoding < 0) {
-    ret = _FaxG4GetRow(src_buf, bitsize, bitpos, m_pScanlineBuf, m_pRefBuf,
-                       m_nColumns);
-  } else if (m_Encoding == 0) {
-    ret = _FaxGet1DLine(src_buf, bitsize, bitpos, m_pScanlineBuf, m_nColumns);
-  } else {
-    if (bitpos == bitsize) {
-      return FALSE;
-    }
-    FX_BOOL bNext1D = src_buf[bitpos / 8] & (1 << (7 - bitpos % 8));
-    bitpos++;
-    if (bNext1D) {
-      ret = _FaxGet1DLine(src_buf, bitsize, bitpos, m_pScanlineBuf, m_nColumns);
-    } else {
-      ret = _FaxG4GetRow(src_buf, bitsize, bitpos, m_pScanlineBuf, m_pRefBuf,
-                         m_nColumns);
-    }
-  }
-  if (!ret) {
-    return FALSE;
-  }
-  if (m_bEndOfLine)
-    if (!_FaxSkipEOL(src_buf, bitsize, bitpos)) {
-      return FALSE;
-    }
-  if (m_bByteAlign) {
-    bitpos = (bitpos + 7) / 8 * 8;
-  }
-  return TRUE;
-}
diff --git a/core/src/fpdfapi/fpdf_parser/fpdf_parser_objects.cpp b/core/src/fpdfapi/fpdf_parser/fpdf_parser_objects.cpp
index 932793218d..3830ad68a3 100644
--- a/core/src/fpdfapi/fpdf_parser/fpdf_parser_objects.cpp
+++ b/core/src/fpdfapi/fpdf_parser/fpdf_parser_objects.cpp
@@ -915,6 +915,7 @@ void CPDF_Stream::InitStream(IFX_FileRead* pFile, CPDF_Dictionary* pDict) {
     m_pDict->SetAtInteger(FX_BSTRC("Length"), m_dwSize);
   }
 }
+
 FX_BOOL CPDF_Stream::Identical(CPDF_Stream* pOther) const {
   if (!m_pDict)
     return pOther->m_pDict ? FALSE : TRUE;
@@ -985,38 +986,7 @@ FX_BOOL CPDF_Stream::Identical(CPDF_Stream* pOther) const {
   }
   return FXSYS_memcmp(m_pDataBuf, pOther->m_pDataBuf, m_dwSize) == 0;
 }
-CPDF_Stream* CPDF_Stream::Clone(FX_BOOL bDirect,
-                                FPDF_LPFCloneStreamCallback lpfCallback,
-                                void* pUserData) const {
-  CPDF_Dictionary* pCloneDict = (CPDF_Dictionary*)m_pDict->Clone(bDirect);
-  IFX_FileStream* pFS = NULL;
-  if (lpfCallback) {
-    pFS = lpfCallback((CPDF_Stream*)this, pUserData);
-  }
-  if (!pFS) {
-    CPDF_StreamAcc acc;
-    acc.LoadAllData(this, TRUE);
-    FX_DWORD streamSize = acc.GetSize();
-    return new CPDF_Stream(acc.DetachData(), streamSize, pCloneDict);
-  }
-  CPDF_Stream* pObj = new CPDF_Stream(NULL, 0, NULL);
-  CPDF_StreamFilter* pSF = GetStreamFilter(TRUE);
-  if (pSF) {
-    uint8_t* pBuf = FX_Alloc(uint8_t, 4096);
-    FX_DWORD dwRead;
-    do {
-      dwRead = pSF->ReadBlock(pBuf, 4096);
-      if (dwRead) {
-        pFS->WriteBlock(pBuf, dwRead);
-      }
-    } while (dwRead == 4096);
-    pFS->Flush();
-    FX_Free(pBuf);
-    delete pSF;
-  }
-  pObj->InitStream((IFX_FileRead*)pFS, pCloneDict);
-  return pObj;
-}
+
 extern FX_BOOL PDF_DataDecode(const uint8_t* src_buf,
                               FX_DWORD src_size,
                               const CPDF_Dictionary* pDict,