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/*===========================================================================
FILE:
BitPacker.h
DESCRIPTION:
Declaration of cBitPacker class
PUBLIC CLASSES AND METHODS:
cBitPacker
This class packs bits into a buffer
Copyright (c) 2011, Code Aurora Forum. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
* Neither the name of Code Aurora Forum nor
the names of its contributors may be used to endorse or promote
products derived from this software without specific prior written
permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
===========================================================================*/
//---------------------------------------------------------------------------
// Pragmas
//---------------------------------------------------------------------------
#pragma once
//---------------------------------------------------------------------------
// Definitions
//---------------------------------------------------------------------------
#include "BitParser.h"
/*=========================================================================*/
// Class cBitPacker
//
// Class to assist in parsing a buffer into bit/byte specified fields
/*=========================================================================*/
class cBitPacker
{
public:
// Constructor (default)
cBitPacker();
// Constructor (from a buffer)
cBitPacker(
BYTE * pData,
ULONG dataBitSize );
// Destructor
~cBitPacker();
// (Inline) Returns the number of bits left in the buffer (from the
// current working bit offset)
ULONG GetNumBitsLeft() const
{
return (mMaxOffset - mOffset);
};
// (Inline) Returns the number of bits in the buffer that have been
// written (essentially the current working bit offset)
ULONG GetNumBitsWritten() const
{
return (mOffset);
};
// (Inline) Returns the number of bits in the buffer that have been
// written (essentially the maximum value the working bit offset
// attained up to now)
ULONG GetTotalBitsWritten() const
{
return mMaxAttainedOffset;
};
// (Inline) Set current working bit offset
void SetOffset( ULONG offset )
{
mOffset = offset;
if (mOffset > mMaxOffset)
{
mOffset = mMaxOffset;
}
if (mOffset > mMaxAttainedOffset)
{
mMaxAttainedOffset = mOffset;
}
};
// (Inline) Are we parsing LSB -> MSB (the default)?
bool GetLSBMode()
{
return mbLSB;
};
// (Inline) Parse LSB -> MSB (if true) or MSB -> LSB
void SetLSBMode( bool bLSB )
{
mbLSB = bLSB;
};
// Write 'numBits' from a CHAR (advances offset)
DWORD Set(
ULONG numBits,
CHAR dataIn );
// Write 'numBits' from a SHORT (advances offset)
DWORD Set(
ULONG numBits,
SHORT dataIn );
// Write 'numBits' from a LONG (advances offset)
DWORD Set(
ULONG numBits,
LONG dataIn );
// Write 'numBits' from a LONGLONG (advances offset)
DWORD Set(
ULONG numBits,
LONGLONG dataIn );
// Write 'numBits' from a UCHAR (advances offset)
DWORD Set(
ULONG numBits,
UCHAR dataIn );
// Write 'numBits' from a USHORT (advances offset)
DWORD Set(
ULONG numBits,
USHORT dataIn );
// Write 'numBits' from a ULONG (advances offset)
DWORD Set(
ULONG numBits,
ULONG dataIn );
// Write 'numBits' from a ULONGLONG (advances offset)
DWORD Set(
ULONG numBits,
ULONGLONG dataIn );
// Release the data being parsed
void ReleaseData();
// Set the data being parsed
void SetData(
BYTE * pData,
ULONG dataBitSize );
protected:
/* Data buffer */
BYTE * mpData;
/* Current bit-specified offset */
ULONG mOffset;
/* Maximum value the above bit offset attained */
ULONG mMaxAttainedOffset;
/* Maximum bit-specified offset */
ULONG mMaxOffset;
/* Are we parsing LSB -> MSB (the default)? */
bool mbLSB;
};
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