1 files changed, 38 insertions, 0 deletions
diff --git a/core/fxcodec/jbig2/JBig2_ArithDecoder.h b/core/fxcodec/jbig2/JBig2_ArithDecoder.h
new file mode 100644
index 0000000000..a8ab5dd730
--- /dev/null
+++ b/core/fxcodec/jbig2/JBig2_ArithDecoder.h
@@ -0,0 +1,38 @@
+// 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_ARITHDECODER_H_
+#define CORE_FXCODEC_JBIG2_JBIG2_ARITHDECODER_H_
+
+class CJBig2_BitStream;
+
+struct JBig2ArithCtx {
+  JBig2ArithCtx() : MPS(0), I(0) {}
+
+  unsigned int MPS;
+  unsigned int I;
+};
+
+class CJBig2_ArithDecoder {
+ public:
+  explicit CJBig2_ArithDecoder(CJBig2_BitStream* pStream);
+
+  ~CJBig2_ArithDecoder();
+
+  int DECODE(JBig2ArithCtx* pCX);
+
+ private:
+  void BYTEIN();
+  void ReadValueA();
+
+  unsigned char m_B;
+  unsigned int m_C;
+  unsigned int m_A;
+  unsigned int m_CT;
+  CJBig2_BitStream* const m_pStream;
+};
+
+#endif  // CORE_FXCODEC_JBIG2_JBIG2_ARITHDECODER_H_