Sanitize CJBig2_SymbolDict's memory usage.

core/src/fxcodec/jbig2/JBig2_SddProc.h

 // Copyright 2015 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_JBIG2_JBIG2_SDDPROC_H_
 #define CORE_SRC_FXCODEC_JBIG2_JBIG2_SDDPROC_H_
 
+#include <vector>
+
 #include "../../../include/fxcrt/fx_system.h"
+#include "JBig2_ArithDecoder.h"
 
-class CJBig2_ArithDecoder;
 class CJBig2_BitStream;
 class CJBig2_HuffmanTable;
 class CJBig2_Image;
 class CJBig2_SymbolDict;
 class IFX_Pause;
-struct JBig2ArithCtx;
 
 class CJBig2_SDDProc {
  public:
   CJBig2_SymbolDict* decode_Arith(CJBig2_ArithDecoder* pArithDecoder,
-                                  JBig2ArithCtx* gbContext,
-                                  JBig2ArithCtx* grContext);
+                                  std::vector<JBig2ArithCtx>* gbContext,
+                                  std::vector<JBig2ArithCtx>* grContext);
 
   CJBig2_SymbolDict* decode_Huffman(CJBig2_BitStream* pStream,
-                                    JBig2ArithCtx* gbContext,
-                                    JBig2ArithCtx* grContext,
+                                    std::vector<JBig2ArithCtx>* gbContext,
+                                    std::vector<JBig2ArithCtx>* grContext,
                                     IFX_Pause* pPause);
 
  public:
   FX_BOOL SDHUFF;
   FX_BOOL SDREFAGG;
   FX_DWORD SDNUMINSYMS;
   CJBig2_Image** SDINSYMS;
   FX_DWORD SDNUMNEWSYMS;
   FX_DWORD SDNUMEXSYMS;
   CJBig2_HuffmanTable* SDHUFFDH;
   CJBig2_HuffmanTable* SDHUFFDW;
   CJBig2_HuffmanTable* SDHUFFBMSIZE;
   CJBig2_HuffmanTable* SDHUFFAGGINST;
   uint8_t SDTEMPLATE;
   int8_t SDAT[8];
   FX_BOOL SDRTEMPLATE;
   int8_t SDRAT[4];
 };
 
 #endif  // CORE_SRC_FXCODEC_JBIG2_JBIG2_SDDPROC_H_