XFA: remove unsafe exif parsing code

core/include/fxcodec/fx_codec.h

 // 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_INCLUDE_FXCODEC_FX_CODEC_H_
 #define CORE_INCLUDE_FXCODEC_FX_CODEC_H_
 
+#include <map>
 #include <vector>
 
 #include "../../../third_party/base/nonstd_unique_ptr.h"
 #include "../fxcrt/fx_basic.h"
 #include "../fxcrt/fx_coordinates.h"
 #include "fx_codec_def.h"
 #include "fx_codec_provider.h"
 
 class CFX_DIBSource;
 class CJPX_Decoder;
@@ skipping 475 matching lines @@
                        FX_FLOAT& G,
                        FX_FLOAT& B);
 void AdobeCMYK_to_sRGB1(uint8_t c,
                         uint8_t m,
                         uint8_t y,
                         uint8_t k,
                         uint8_t& R,
                         uint8_t& G,
                         uint8_t& B);
 FX_BOOL MD5ComputeID(const void* buf, FX_DWORD dwSize, uint8_t ID[16]);
+
 class CFX_DIBAttribute {
  public:
   CFX_DIBAttribute();
   ~CFX_DIBAttribute();
 
   int32_t m_nXDPI;
-
   int32_t m_nYDPI;
-
   FX_FLOAT m_fAspectRatio;
-
   FX_WORD m_wDPIUnit;
-
   CFX_ByteString m_strAuthor;
-
   uint8_t m_strTime[20];
-
   int32_t m_nGifLeft;
   int32_t m_nGifTop;
-
   FX_DWORD* m_pGifLocalPalette;
-
   FX_DWORD m_nGifLocalPalNum;
-
   int32_t m_nBmpCompressType;
-  class IFX_DIBAttributeExif* m_pExif;
-};
-class IFX_DIBAttributeExif {
- public:
-  virtual ~IFX_DIBAttributeExif(){};
-  virtual FX_BOOL GetInfo(FX_WORD tag, void* val) = 0;
+  std::map<FX_DWORD, void*> m_Exif;
 };
 
 FX_BOOL FaxSkipEOL(const uint8_t* src_buf, int bitsize, int& bitpos);
 FX_BOOL FaxGet1DLine(const uint8_t* src_buf,
                      int bitsize,
                      int& bitpos,
                      uint8_t* dest_buf,
                      int columns);
 FX_BOOL FaxG4GetRow(const uint8_t* src_buf,
                     int bitsize,
                     int& bitpos,
                     uint8_t* dest_buf,
                     const uint8_t* ref_buf,
                     int columns);
 void FaxG4Decode(const uint8_t* src_buf,
                  FX_DWORD src_size,
                  int* pbitpos,
                  uint8_t* dest_buf,
                  int width,
                  int height,
                  int pitch);
 
 #endif  // CORE_INCLUDE_FXCODEC_FX_CODEC_H_