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81 lines
2.1 KiB
81 lines
2.1 KiB
/***************************************************************************
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kbinarybytecodec.cpp - description
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-------------------
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begin : Mo Nov 29 2004
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copyright : (C) 2004 by Friedrich W. H. Kossebau
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email : Friedrich.W.H@Kossebau.de
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***************************************************************************/
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/***************************************************************************
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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 Library General Public *
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* License version 2 as published by the Free Software Foundation. *
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* *
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***************************************************************************/
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// lib specific
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#include "kbinarybytecodec.h"
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using namespace KHE;
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void KBinaryByteCodec::encode( QString &Digits, unsigned int Pos, const unsigned char Char ) const
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{
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for( unsigned char M=1<<7; M>0; M>>=1 )
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Digits.at(Pos++) = (Char & M) ? '1' : '0';
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}
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void KBinaryByteCodec::encodeShort( QString &Digits, unsigned int Pos, unsigned char Char ) const
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{
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unsigned char M = 1<<7;
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// find first set bit
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for( ; M>0; M>>=1 )
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if( Char & M )
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break;
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// now set the
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for( ; M>0; M>>=1 )
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Digits.at(Pos++) = (Char & M) ? '1' : '0';
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}
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bool KBinaryByteCodec::isValidDigit( unsigned char Digit ) const
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{
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return Digit == '0' || Digit == '1';
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}
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bool KBinaryByteCodec::turnToValue( unsigned char *Digit ) const
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{
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if( isValidDigit(*Digit) )
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{
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*Digit -= '0';
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return true;
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}
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return false;
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}
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bool KBinaryByteCodec::appendDigit( unsigned char *Byte, unsigned char Digit ) const
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{
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if( turnToValue(&Digit) )
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{
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unsigned char B = *Byte;
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if( B < 128 )
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{
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B <<= 1;
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B += Digit;
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*Byte = B;
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return true;
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}
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}
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return false;
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}
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void KBinaryByteCodec::removeLastDigit( unsigned char *Byte ) const
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{
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*Byte >>= 1;
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}
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