G4OutBitStream Class Reference

#include <G4RTOutBitStream.hh>

Public Member Functions
	G4OutBitStream (int size)
	~G4OutBitStream ()
void	SetBits (int v, int numBits)
void	SetByte (u_char dat)
void	SetWord (u_int dat)
void	CopyByte (const char *src, int n)
u_char *	GetStreamAddress (void)
int	GetStreamSize (void)

Protected Member Functions
void	IncBuf (void)
void	FullBit (void)
void	Set8Bits (u_char v, int numBits)
void	SetFewBits (u_char v, int numBits)
void	SetBits2Byte (u_char v, int numBits)

Protected Attributes
u_char *	mHeadOfBuf
u_char *	mBuf
u_char *	mEndOfBuf
int	mBitPos
int	mWriteFlag

Detailed Description

Definition at line 43 of file G4RTOutBitStream.hh.

Constructor & Destructor Documentation

G4OutBitStream()

G4OutBitStream::G4OutBitStream

(

int

size

)

Definition at line 37 of file G4RTOutBitStream.cc.

{
  if(size < 1)
        throw( G4MemoryError( size, "G4OutBitStream" ) );
 
  mHeadOfBuf = mBuf = new u_char[size];
  if( mHeadOfBuf == 0 )
        throw( G4MemoryError( size, "G4OutBitStream" ) );
 
  mEndOfBuf = mBuf + size;
 
  memset( mHeadOfBuf, 0, size );
 
  mBitPos = 7;
  mWriteFlag = 1;
}

~G4OutBitStream()

G4OutBitStream::~G4OutBitStream

(

)

Definition at line 54 of file G4RTOutBitStream.cc.

{
  delete mBuf;
}

Member Function Documentation

CopyByte()

void G4OutBitStream::CopyByte	(	const char *	src,
		int	n )

Definition at line 157 of file G4RTOutBitStream.cc.

{
  if( mBuf+n < mEndOfBuf ){
        FullBit();
        memcpy( mBuf, src, n );
        mBuf += n;
        return;
  }
  throw( G4BufferError( "CopyByte" ) );
}

Referenced by G4JpegCoder::WriteHeader().

FullBit()

void G4OutBitStream::FullBit ( void )

protected

Definition at line 124 of file G4RTOutBitStream.cc.

{
  if( mBitPos != 7 )
        SetFewBits( BitFullMaskT[mBitPos], mBitPos+1 );
}

Referenced by CopyByte(), SetByte(), and SetWord().

GetStreamAddress()

u_char * G4OutBitStream::GetStreamAddress ( void )

inline

Definition at line 53 of file G4RTOutBitStream.hh.

{return mHeadOfBuf;};

Referenced by G4JpegCoder::GetJpegData().

GetStreamSize()

int G4OutBitStream::GetStreamSize ( void )

inline

Definition at line 54 of file G4RTOutBitStream.hh.

{return int(mBuf - mHeadOfBuf);};

Referenced by G4JpegCoder::GetJpegData().

IncBuf()

void G4OutBitStream::IncBuf ( void )

protected

Definition at line 60 of file G4RTOutBitStream.cc.

{
  if( ++mBuf >= mEndOfBuf )
        mWriteFlag = 0;
}

Referenced by SetBits2Byte(), SetByte(), SetFewBits(), and SetWord().

Set8Bits()

void G4OutBitStream::Set8Bits ( u_char v, int numBits )

protected

Definition at line 114 of file G4RTOutBitStream.cc.

{
  if( mBitPos + 1 >= numBits )
        SetFewBits( (u_char)v, numBits );
 else
        SetBits2Byte( (u_char)v, numBits );
}

Referenced by SetBits().

SetBits()

void G4OutBitStream::SetBits	(	int	v,
		int	numBits )

Definition at line 69 of file G4RTOutBitStream.cc.

{
  if( numBits == 0 )
        return;
  if( numBits > 16 )
        throw( G4BufferError( "SetBits:Max Bit Over" ) );
  if( numBits > 8 ){
        Set8Bits( u_char(v>>8), numBits-8 );
        numBits = 8;
  }
  Set8Bits( u_char(v), numBits );
}

Referenced by G4JpegCoder::CodeHuffman().

SetBits2Byte()

void G4OutBitStream::SetBits2Byte ( u_char v, int numBits )

protected

Definition at line 98 of file G4RTOutBitStream.cc.

{
  v &= BitFullMaskT[numBits-1];
  int nextBits = numBits - (mBitPos + 1);
  *mBuf |= ( v >> nextBits ) & BitFullMaskT[mBitPos];
  if( *mBuf == 0xff ){
        IncBuf();
        *mBuf = 0;
  }
  IncBuf();
 
  *mBuf = v << (8 - nextBits);
  mBitPos = 7 - nextBits;
}

Referenced by Set8Bits().

SetByte()

void G4OutBitStream::SetByte

(

u_char

dat

)

Definition at line 131 of file G4RTOutBitStream.cc.

{
  if( mWriteFlag ){
        FullBit();
        *mBuf = dat;
        IncBuf();
        return;
  }
  throw( G4BufferError( "SetByte" ) );
}

Referenced by G4JpegCoder::WriteEOI(), and G4JpegCoder::WriteHeader().

SetFewBits()

void G4OutBitStream::SetFewBits ( u_char v, int numBits )

protected

Definition at line 83 of file G4RTOutBitStream.cc.

{
  v &= BitFullMaskT[numBits-1];
  *mBuf |= v << (mBitPos + 1 - numBits);
  if( (mBitPos -= numBits) < 0 ){
        if( *mBuf == 0xff ){
          IncBuf();
          *mBuf = 0;
        }
        IncBuf();
        mBitPos = 7;
    }
}

Referenced by FullBit(), and Set8Bits().

SetWord()

void G4OutBitStream::SetWord

(

u_int

dat

)

Definition at line 143 of file G4RTOutBitStream.cc.

{
  if( mWriteFlag ){
        FullBit();
        *mBuf = (dat >> 8) & 0xff;
        IncBuf();
        *mBuf = dat & 0xff;
        IncBuf();
        return;
  }
  throw( G4BufferError( "SetWord" ) );
}

Referenced by G4JpegCoder::WriteHeader().

Member Data Documentation

mBitPos

int G4OutBitStream::mBitPos

protected

Definition at line 61 of file G4RTOutBitStream.hh.

Referenced by FullBit(), G4OutBitStream(), Set8Bits(), SetBits2Byte(), and SetFewBits().

mBuf

u_char* G4OutBitStream::mBuf

protected

Definition at line 59 of file G4RTOutBitStream.hh.

Referenced by CopyByte(), G4OutBitStream(), GetStreamSize(), IncBuf(), SetBits2Byte(), SetByte(), SetFewBits(), SetWord(), and ~G4OutBitStream().

mEndOfBuf

u_char* G4OutBitStream::mEndOfBuf

protected

Definition at line 60 of file G4RTOutBitStream.hh.

Referenced by CopyByte(), G4OutBitStream(), and IncBuf().

mHeadOfBuf

u_char* G4OutBitStream::mHeadOfBuf

protected

Definition at line 58 of file G4RTOutBitStream.hh.

Referenced by G4OutBitStream(), GetStreamAddress(), and GetStreamSize().

mWriteFlag

int G4OutBitStream::mWriteFlag

protected

Definition at line 62 of file G4RTOutBitStream.hh.

Referenced by G4OutBitStream(), IncBuf(), SetByte(), and SetWord().

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The documentation for this class was generated from the following files:

• G4RTOutBitStream.hh
• G4RTOutBitStream.cc