| /********** |
| 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 3 of the License, or (at your |
| option) any later version. (See <http://www.gnu.org/copyleft/lesser.html>.) |
| |
| 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., |
| 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| **********/ |
| // "liveMedia" |
| // Copyright (c) 1996-2020 Live Networks, Inc. All rights reserved. |
| // Bit Vector data structure |
| // C++ header |
| |
| #ifndef _BIT_VECTOR_HH |
| #define _BIT_VECTOR_HH |
| |
| #ifndef _BOOLEAN_HH |
| #include "Boolean.hh" |
| #endif |
| |
| class BitVector { |
| public: |
| BitVector(unsigned char* baseBytePtr, |
| unsigned baseBitOffset, |
| unsigned totNumBits); |
| |
| void setup(unsigned char* baseBytePtr, |
| unsigned baseBitOffset, |
| unsigned totNumBits); |
| |
| void putBits(unsigned from, unsigned numBits); // "numBits" <= 32 |
| void put1Bit(unsigned bit); |
| |
| unsigned getBits(unsigned numBits); // "numBits" <= 32 |
| unsigned get1Bit(); |
| Boolean get1BitBoolean() { return get1Bit() != 0; } |
| |
| void skipBits(unsigned numBits); |
| |
| unsigned curBitIndex() const { return fCurBitIndex; } |
| unsigned totNumBits() const { return fTotNumBits; } |
| unsigned numBitsRemaining() const { return fTotNumBits - fCurBitIndex; } |
| |
| unsigned get_expGolomb(); |
| // Returns the value of the next bits, assuming that they were encoded using an exponential-Golomb code of order 0 |
| int get_expGolombSigned(); // signed version of the above |
| |
| private: |
| unsigned char* fBaseBytePtr; |
| unsigned fBaseBitOffset; |
| unsigned fTotNumBits; |
| unsigned fCurBitIndex; |
| }; |
| |
| // A general bit copy operation: |
| void shiftBits(unsigned char* toBasePtr, unsigned toBitOffset, |
| unsigned char const* fromBasePtr, unsigned fromBitOffset, |
| unsigned numBits); |
| |
| #endif |