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| | | /********** |
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| | | This library is free software; you can redistribute it and/or modify it under |
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| | | the terms of the GNU Lesser General Public License as published by the |
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| | | Free Software Foundation; either version 3 of the License, or (at your |
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| | | option) any later version. (See <http://www.gnu.org/copyleft/lesser.html>.) |
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| | | |
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| | | This library is distributed in the hope that it will be useful, but WITHOUT |
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| | | ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS |
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| | | FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for |
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| | | more details. |
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| | | |
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| | | You should have received a copy of the GNU Lesser General Public License |
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| | | along with this library; if not, write to the Free Software Foundation, Inc., |
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| | | 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| | | **********/ |
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| | | // "liveMedia" |
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| | | // Copyright (c) 1996-2017 Live Networks, Inc. All rights reserved. |
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| | | // Bit Vector data structure |
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| | | // C++ header |
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| | | |
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| | | #ifndef _BIT_VECTOR_HH |
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| | | #define _BIT_VECTOR_HH |
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| | | |
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| | | #ifndef _BOOLEAN_HH |
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| | | #include "Boolean.hh" |
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| | | #endif |
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| | | |
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| | | class BitVector { |
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| | | public: |
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| | | BitVector(unsigned char* baseBytePtr, |
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| | | unsigned baseBitOffset, |
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| | | unsigned totNumBits); |
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| | | |
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| | | void setup(unsigned char* baseBytePtr, |
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| | | unsigned baseBitOffset, |
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| | | unsigned totNumBits); |
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| | | |
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| | | void putBits(unsigned from, unsigned numBits); // "numBits" <= 32 |
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| | | void put1Bit(unsigned bit); |
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| | | |
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| | | unsigned getBits(unsigned numBits); // "numBits" <= 32 |
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| | | unsigned get1Bit(); |
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| | | Boolean get1BitBoolean() { return get1Bit() != 0; } |
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| | | |
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| | | void skipBits(unsigned numBits); |
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| | | |
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| | | unsigned curBitIndex() const { return fCurBitIndex; } |
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| | | unsigned totNumBits() const { return fTotNumBits; } |
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| | | unsigned numBitsRemaining() const { return fTotNumBits - fCurBitIndex; } |
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| | | |
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| | | unsigned get_expGolomb(); |
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| | | // Returns the value of the next bits, assuming that they were encoded using an exponential-Golomb code of order 0 |
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| | | |
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| | | private: |
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| | | unsigned char* fBaseBytePtr; |
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| | | unsigned fBaseBitOffset; |
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| | | unsigned fTotNumBits; |
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| | | unsigned fCurBitIndex; |
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| | | }; |
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| | | |
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| | | // A general bit copy operation: |
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| | | void shiftBits(unsigned char* toBasePtr, unsigned toBitOffset, |
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| | | unsigned char const* fromBasePtr, unsigned fromBitOffset, |
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| | | unsigned numBits); |
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| | | |
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| | | #endif |
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