68 lines
2.2 KiB
C++
68 lines
2.2 KiB
C++
/**********
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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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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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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) 1996-2024 Live Networks, Inc. All rights reserved.
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// Bit Vector data structure
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// C++ header
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#ifndef _BIT_VECTOR_HH
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#define _BIT_VECTOR_HH
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#ifndef _BOOLEAN_HH
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#include "Boolean.hh"
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#endif
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class LIVEMEDIA_API 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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void setup(unsigned char* baseBytePtr,
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unsigned baseBitOffset,
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unsigned totNumBits);
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void putBits(unsigned from, unsigned numBits); // "numBits" <= 32
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void put1Bit(unsigned bit);
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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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void skipBits(unsigned numBits);
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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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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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int get_expGolombSigned(); // signed version of the above
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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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// 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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#endif
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