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diff --git a/core/fxcodec/jbig2/JBig2_ArithIntDecoder.h b/core/fxcodec/jbig2/JBig2_ArithIntDecoder.h
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+++ b/core/fxcodec/jbig2/JBig2_ArithIntDecoder.h
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+// 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_FXCODEC_JBIG2_JBIG2_ARITHINTDECODER_H_
+#define CORE_FXCODEC_JBIG2_JBIG2_ARITHINTDECODER_H_
+
+#include <vector>
+
+#include "core/fxcodec/jbig2/JBig2_ArithDecoder.h"
+#include "core/include/fxcrt/fx_system.h"
+
+class CJBig2_ArithIntDecoder {
+ public:
+  CJBig2_ArithIntDecoder();
+  ~CJBig2_ArithIntDecoder();
+
+  // Returns true on success, and false when an OOB condition occurs. Many
+  // callers can tolerate OOB and do not check the return value.
+  bool decode(CJBig2_ArithDecoder* pArithDecoder, int* nResult);
+
+ private:
+  std::vector<JBig2ArithCtx> m_IAx;
+};
+
+class CJBig2_ArithIaidDecoder {
+ public:
+  explicit CJBig2_ArithIaidDecoder(unsigned char SBSYMCODELENA);
+  ~CJBig2_ArithIaidDecoder();
+
+  void decode(CJBig2_ArithDecoder* pArithDecoder, FX_DWORD* nResult);
+
+ private:
+  std::vector<JBig2ArithCtx> m_IAID;
+
+  const unsigned char SBSYMCODELEN;
+};
+
+#endif  // CORE_FXCODEC_JBIG2_JBIG2_ARITHINTDECODER_H_