JMA Support.

zsnes/src/jma/rcdefs.h

@@ -0,0 +1,61 @@
+/*
+Copyright (C) 2002 Andrea Mazzoleni ( http://advancemame.sf.net )
+Copyright (C) 2001-4 Igor Pavlov ( http://www.7-zip.org )
+
+This library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Lesser General Public
+License as published by the Free Software Foundation; either
+version 2.1 of the License, or (at your option) any later version.
+
+This library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public
+License along with this library; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+*/
+
+#ifndef __RCDEFS_H
+#define __RCDEFS_H
+
+#include "aribitcd.h"
+#include "ariconst.h"
+
+#define RC_INIT_VAR                            \
+  UINT32 aRange = aRangeDecoder->m_Range;      \
+  UINT32 aCode = aRangeDecoder->m_Code;        
+
+#define RC_FLUSH_VAR                          \
+  aRangeDecoder->m_Range = aRange;            \
+  aRangeDecoder->m_Code = aCode;
+
+#define RC_NORMALIZE                                    \
+    if (aRange < NCompression::NArithmetic::kTopValue)               \
+    {                                                              \
+      aCode = (aCode << 8) | aRangeDecoder->m_Stream.ReadByte();   \
+      aRange <<= 8; }
+
+#define RC_GETBIT2(aNumMoveBits, aProb, aModelIndex, Action0, Action1)                        \
+    {UINT32 aNewBound = (aRange >> NCompression::NArithmetic::kNumBitModelTotalBits) * aProb; \
+    if (aCode < aNewBound)                               \
+    {                                                             \
+      Action0;                                                    \
+      aRange = aNewBound;                                         \
+      aProb += (NCompression::NArithmetic::kBitModelTotal - aProb) >> aNumMoveBits;          \
+      aModelIndex <<= 1;                                          \
+    }                                                             \
+    else                                                          \
+    {                                                             \
+      Action1;                                                    \
+      aRange -= aNewBound;                                        \
+      aCode -= aNewBound;                                          \
+      aProb -= (aProb) >> aNumMoveBits;                           \
+      aModelIndex = (aModelIndex << 1) + 1;                       \
+    }}                                                             \
+    RC_NORMALIZE
+
+#define RC_GETBIT(aNumMoveBits, aProb, aModelIndex) RC_GETBIT2(aNumMoveBits, aProb, aModelIndex, ; , ;)               
+
+#endif