loicloic
72 lines
1.7 KiB
C++
72 lines
1.7 KiB
C++
/*
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www.freedo.org
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The first and only working 3DO multiplayer emulator.
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The FreeDO licensed under modified GNU LGPL, with following notes:
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* The owners and original authors of the FreeDO have full right to develop closed source derivative work.
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* Any non-commercial uses of the FreeDO sources or any knowledge obtained by studying or reverse engineering
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of the sources, or any other material published by FreeDO have to be accompanied with full credits.
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* Any commercial uses of FreeDO sources or any knowledge obtained by studying or reverse engineering of the sources,
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or any other material published by FreeDO is strictly forbidden without owners approval.
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The above notes are taking precedence over GNU LGPL in conflicting situations.
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Project authors:
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Alexander Troosh
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Maxim Grishin
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Allen Wright
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John Sammons
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Felix Lazarev
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*/
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#include "freedoconfig.h"
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#include "bitop.h"
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#include "arm.h"
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uint32 BitReaderBig::Read()
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{
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const static uint8 mas[]={0,1,3,7,15,31,63,127,255};
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uint32 retval=0;
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int32 bitcnt=bitset;
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if(!buf)return retval;
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if((8-bitpoint)>bitset)
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{
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retval=_mem_read8(buf+(point^3));
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retval>>=8-bitpoint-bitset;
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retval&=mas[bitset];
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bitpoint+=bitset;
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return retval;
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}
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if(bitpoint)
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{
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retval=_mem_read8(buf+(point^3))&mas[8-bitpoint];
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point++;
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bitcnt-=8-bitpoint;
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}
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while(bitcnt>=8)
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{
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retval<<=8;
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retval|=_mem_read8(buf+(point^3));
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point++;
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bitcnt-=8;
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}
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if(bitcnt)
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{
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retval<<=bitcnt;
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retval|=_mem_read8(buf+(point^3))>>(8-bitcnt);
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}
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bitpoint=bitcnt;
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return retval;
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}
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uint32 BitReaderBig::Read(uint8 bits)
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{
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SetBitRate(bits);
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return Read();
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}
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