XFA: remove unsafe exif parsing code

core/src/fxcodec/codec/codec_int.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_SRC_FXCODEC_CODEC_CODEC_INT_H_
 #define CORE_SRC_FXCODEC_CODEC_CODEC_INT_H_
 
 #include <limits.h>
@@ skipping 367 matching lines @@
                              FX_DWORD height,
                              CPDF_StreamAcc* src_stream,
                              CPDF_StreamAcc* global_stream,
                              uint8_t* dest_buf,
                              FX_DWORD dest_pitch,
                              IFX_Pause* pPause) override;
   FXCODEC_STATUS ContinueDecode(void* pJbig2Context,
                                 IFX_Pause* pPause) override;
   void DestroyJbig2Context(void* pJbig2Context) override;
 };
-class CFX_DIBAttributeExif : public IFX_DIBAttributeExif {
- public:
-  CFX_DIBAttributeExif();
-  ~CFX_DIBAttributeExif();
-  virtual FX_BOOL GetInfo(FX_WORD tag, void* val);
-
-  FX_BOOL ParseExif(CFX_MapPtrTemplate<FX_DWORD, uint8_t*>* pHead,
-                    uint8_t* data,
-                    FX_DWORD len,
-                    CFX_MapPtrTemplate<FX_DWORD, uint8_t*>* pVal);
-
-  typedef FX_WORD (*_Read2Bytes)(uint8_t* data);
-  typedef FX_DWORD (*_Read4Bytes)(uint8_t* data);
-  uint8_t* ParseExifIFH(uint8_t* data,
-                        FX_DWORD len,
-                        _Read2Bytes* pReadWord,
-                        _Read4Bytes* pReadDword);
-  FX_BOOL ParseExifIFD(CFX_MapPtrTemplate<FX_DWORD, uint8_t*>* pMap,
-                       uint8_t* data,
-                       FX_DWORD len);
-
-  uint8_t* m_pExifData;
-
-  FX_DWORD m_dwExifDataLen;
-
-  void clear();
-  _Read2Bytes m_readWord;
-  _Read4Bytes m_readDword;
-  CFX_MapPtrTemplate<FX_DWORD, uint8_t*> m_TagHead;
-  CFX_MapPtrTemplate<FX_DWORD, uint8_t*> m_TagVal;
-};
-
 struct DecodeData {
  public:
   DecodeData(unsigned char* src_data, OPJ_SIZE_T src_size)
       : src_data(src_data), src_size(src_size), offset(0) {}
   unsigned char* src_data;
   OPJ_SIZE_T src_size;
   OPJ_SIZE_T offset;
 };
 
 void sycc420_to_rgb(opj_image_t* img);
 
 /* Wrappers for C-style callbacks. */
 OPJ_SIZE_T opj_read_from_memory(void* p_buffer,
                                 OPJ_SIZE_T nb_bytes,
                                 void* p_user_data);
 OPJ_SIZE_T opj_write_from_memory(void* p_buffer,
                                  OPJ_SIZE_T nb_bytes,
                                  void* p_user_data);
 OPJ_OFF_T opj_skip_from_memory(OPJ_OFF_T nb_bytes, void* p_user_data);
 OPJ_BOOL opj_seek_from_memory(OPJ_OFF_T nb_bytes, void* p_user_data);
 
 #endif  // CORE_SRC_FXCODEC_CODEC_CODEC_INT_H_