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get_bits.h

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00001 /* ScummVM - Graphic Adventure Engine
00002  *
00003  * ScummVM is the legal property of its developers, whose names
00004  * are too numerous to list here. Please refer to the COPYRIGHT
00005  * file distributed with this source distribution.
00006  *
00007  * This program is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU General Public License
00009  * as published by the Free Software Foundation; either version 2
00010  * of the License, or (at your option) any later version.
00011  *
00012  * This program is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00015  * GNU General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU General Public License
00018  * along with this program; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
00020  *
00021  */
00022 
00023 #ifndef IMAGE_CODECS_INDEO_GET_BITS_H
00024 #define IMAGE_CODECS_INDEO_GET_BITS_H
00025 
00026 #include "common/bitstream.h"
00027 
00028 namespace Image {
00029 namespace Indeo {
00030 
00034 class GetBits : public Common::BitStreamMemory8LSB {
00035 public:
00039     GetBits(const byte *dataPtr, uint32 dataSize) : Common::BitStreamMemory8LSB(new Common::BitStreamMemoryStream(dataPtr, dataSize), DisposeAfterUse::YES) {}
00040 
00044     int getBitsLeft() const { return size() - pos(); }
00045 
00054     template <int maxDepth>
00055     int getVLC2(int16 (*table)[2], int bits) {
00056         int code;
00057         int n, nbBits;
00058         unsigned int index;
00059 
00060         index = peekBits(bits);
00061         code  = table[index][0];
00062         n     = table[index][1];
00063 
00064         if (maxDepth > 1 && n < 0) {
00065             skip(bits);
00066             nbBits = -n;
00067 
00068             index = peekBits(nbBits) + code;
00069             code = table[index][0];
00070             n = table[index][1];
00071 
00072             if (maxDepth > 2 && n < 0) {
00073                 skip(nbBits);
00074                 nbBits = -n;
00075 
00076                 index = peekBits(nbBits) + code;
00077                 code = table[index][0];
00078                 n = table[index][1];
00079             }
00080         }
00081 
00082         skip(n);
00083         return code;
00084     }
00085 };
00086 
00087 } // End of namespace Indeo
00088 } // End of namespace Image
00089 
00090 #endif


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