1 | /* |
2 | Copyright (C) 2002 Andrea Mazzoleni ( http://advancemame.sf.net ) |
3 | Copyright (C) 2001-4 Igor Pavlov ( http://www.7-zip.org ) |
4 | |
5 | This library is free software; you can redistribute it and/or |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License version 2.1 as published by the Free Software Foundation. |
8 | |
9 | This library is distributed in the hope that it will be useful, |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
12 | Lesser General Public License for more details. |
13 | |
14 | You should have received a copy of the GNU Lesser General Public |
15 | License along with this library; if not, write to the Free Software |
16 | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
17 | */ |
18 | |
19 | #ifndef __RCDEFS_H |
20 | #define __RCDEFS_H |
21 | |
22 | #include "aribitcd.h" |
23 | #include "ariconst.h" |
24 | |
25 | #define RC_INIT_VAR \ |
26 | UINT32 aRange = aRangeDecoder->m_Range; \ |
27 | UINT32 aCode = aRangeDecoder->m_Code; |
28 | |
29 | #define RC_FLUSH_VAR \ |
30 | aRangeDecoder->m_Range = aRange; \ |
31 | aRangeDecoder->m_Code = aCode; |
32 | |
33 | #define RC_NORMALIZE \ |
34 | if (aRange < NCompression::NArithmetic::kTopValue) \ |
35 | { \ |
36 | aCode = (aCode << 8) | aRangeDecoder->m_Stream.ReadByte(); \ |
37 | aRange <<= 8; } |
38 | |
39 | #define RC_GETBIT2(aNumMoveBits, aProb, aModelIndex, Action0, Action1) \ |
40 | {UINT32 aNewBound = (aRange >> NCompression::NArithmetic::kNumBitModelTotalBits) * aProb; \ |
41 | if (aCode < aNewBound) \ |
42 | { \ |
43 | Action0; \ |
44 | aRange = aNewBound; \ |
45 | aProb += (NCompression::NArithmetic::kBitModelTotal - aProb) >> aNumMoveBits; \ |
46 | aModelIndex <<= 1; \ |
47 | } \ |
48 | else \ |
49 | { \ |
50 | Action1; \ |
51 | aRange -= aNewBound; \ |
52 | aCode -= aNewBound; \ |
53 | aProb -= (aProb) >> aNumMoveBits; \ |
54 | aModelIndex = (aModelIndex << 1) + 1; \ |
55 | }} \ |
56 | RC_NORMALIZE |
57 | |
58 | #define RC_GETBIT(aNumMoveBits, aProb, aModelIndex) RC_GETBIT2(aNumMoveBits, aProb, aModelIndex, ; , ;) |
59 | |
60 | #endif |
61 | |