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90 lines
1.7 KiB
C++
90 lines
1.7 KiB
C++
/*
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* libsmackerdec - Smacker video decoder
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* Copyright (C) 2011 Barry Duncan
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "BitReader.h"
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#include <assert.h>
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namespace SmackerCommon {
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BitReader::BitReader(SmackerCommon::FileStream &file, uint32_t size)
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{
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this->file = &file;
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this->totalSize = size;
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this->currentOffset = 0;
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this->bytesRead = 0;
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this->Cache.Resize(size);
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file.ReadBytes(this->Cache.Data(), size);
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}
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BitReader::~BitReader()
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{
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}
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void BitReader::FillCache()
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{
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}
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uint32_t BitReader::GetSize()
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{
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return totalSize * 8;
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}
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uint32_t BitReader::GetPosition()
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{
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return currentOffset;
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}
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uint32_t BitReader::GetBit()
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{
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uint32_t ret = (Cache[currentOffset>>3]>>(currentOffset&7))&1;
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currentOffset++;
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return ret;
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}
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uint32_t BitReader::GetBits(uint32_t n)
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{
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uint32_t ret = 0;
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int bitsTodo = n;
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uint32_t theShift = 0;
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while (bitsTodo)
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{
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uint32_t bit = GetBit();
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bit <<= theShift;
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theShift++;
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ret |= bit;
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bitsTodo--;
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}
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return ret;
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}
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void BitReader::SkipBits(uint32_t n)
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{
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GetBits(n);
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}
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} // close namespace SmackerCommon
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