Gabriele Cosmo
162 lines
3.8 KiB
C++
162 lines
3.8 KiB
C++
//
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// ********************************************************************
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// * DISCLAIMER *
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// * *
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// * The following disclaimer summarizes all the specific disclaimers *
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// * of contributors to this software. The specific disclaimers,which *
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// * govern, are listed with their locations in: *
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// * http://cern.ch/geant4/license *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. *
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// * *
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// * This code implementation is the intellectual property of the *
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// * GEANT4 collaboration. *
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// * By copying, distributing or modifying the Program (or any work *
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// * based on the Program) you indicate your acceptance of this *
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// * statement, and all its terms. *
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// ********************************************************************
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//
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//
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// $Id: G4RTOutBitStream.cc,v 1.3.4.1 2001/06/28 19:15:53 gunter Exp $
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// GEANT4 tag $Name: $
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//
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//
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//
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#include <string.h>
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#include "G4RTJpeg.hh"
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#include "G4RTOutBitStream.hh"
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G4OutBitStream::G4OutBitStream(int size)
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{
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if(size < 1)
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throw( G4MemoryError( size, "G4OutBitStream" ) );
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mHeadOfBuf = mBuf = new u_char[size];
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if( mHeadOfBuf == 0 )
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throw( G4MemoryError( size, "G4OutBitStream" ) );
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mEndOfBuf = mBuf + size;
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memset( mHeadOfBuf, 0, size );
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mBitPos = 7;
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mWriteFlag = 1;
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}
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void
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G4OutBitStream::IncBuf( void )
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{
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if( ++mBuf >= mEndOfBuf )
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mWriteFlag = 0;
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}
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void
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G4OutBitStream::SetBits(int v, int numBits)
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{
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if( numBits == 0 )
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return;
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if( numBits > 16 )
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throw( G4BufferError( "SetBits:Max Bit Over" ) );
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if( numBits > 8 ){
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Set8Bits( u_char(v>>8), numBits-8 );
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numBits = 8;
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}
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Set8Bits( u_char(v), numBits );
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}
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void
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G4OutBitStream::SetFewBits(u_char v, int numBits)
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{
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v &= BitFullMaskT[numBits-1];
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*mBuf |= v << (mBitPos + 1 - numBits);
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if( (mBitPos -= numBits) < 0 ){
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if( *mBuf == 0xff ){
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IncBuf();
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*mBuf = 0;
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}
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IncBuf();
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mBitPos = 7;
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}
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}
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void
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G4OutBitStream::SetBits2Byte(u_char v, int numBits)
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{
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v &= BitFullMaskT[numBits-1];
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int nextBits = numBits - (mBitPos + 1);
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*mBuf |= ( v >> nextBits ) & BitFullMaskT[mBitPos];
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if( *mBuf == 0xff ){
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IncBuf();
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*mBuf = 0;
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}
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IncBuf();
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*mBuf = v << 8 - nextBits;
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mBitPos = 7 - nextBits;
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}
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void
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G4OutBitStream::Set8Bits(u_char v, int numBits)
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{
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if( mBitPos + 1 >= numBits )
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SetFewBits( (u_char)v, numBits );
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else
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SetBits2Byte( (u_char)v, numBits );
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}
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void
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G4OutBitStream::FullBit( void )
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{
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if( mBitPos != 7 )
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SetFewBits( BitFullMaskT[mBitPos], mBitPos+1 );
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}
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void
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G4OutBitStream::SetByte(u_char dat)
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{
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if( mWriteFlag ){
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FullBit();
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*mBuf = dat;
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IncBuf();
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return;
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}
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throw( G4BufferError( "SetByte" ) );
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}
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void
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G4OutBitStream::SetWord(u_int dat)
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{
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if( mWriteFlag ){
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FullBit();
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*mBuf = (dat >> 8) & 0xff;
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IncBuf();
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*mBuf = dat & 0xff;
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IncBuf();
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return;
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}
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throw( G4BufferError( "SetWord" ) );
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}
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void
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G4OutBitStream::CopyByte(const char* src, int n)
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{
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if( mBuf+n < mEndOfBuf ){
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FullBit();
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memcpy( mBuf, src, n );
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mBuf += n;
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return;
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}
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throw( G4BufferError( "CopyByte" ) );
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}
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