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