CoolVLViewer/indra/llcommon/llbitpack.h

/**
 * @file bitpack.h
 * @brief Convert data to packed bit stream
 *
 * $LicenseInfo:firstyear=2000&license=viewergpl$
 *
 * Copyright (c) 2000-2009, Linden Research, Inc.
 *
 * Second Life Viewer Source Code
 * The source code in this file ("Source Code") is provided by Linden Lab
 * to you under the terms of the GNU General Public License, version 2.0
 * ("GPL"), unless you have obtained a separate licensing agreement
 * ("Other License"), formally executed by you and Linden Lab.  Terms of
 * the GPL can be found in doc/GPL-license.txt in this distribution, or
 * online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
 *
 * There are special exceptions to the terms and conditions of the GPL as
 * it is applied to this Source Code. View the full text of the exception
 * in the file doc/FLOSS-exception.txt in this software distribution, or
 * online at
 * http://secondlifegrid.net/programs/open_source/licensing/flossexception
 *
 * By copying, modifying or distributing this software, you acknowledge
 * that you have read and understood your obligations described above,
 * and agree to abide by those obligations.
 *
 * ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
 * WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
 * COMPLETENESS OR PERFORMANCE.
 * $/LicenseInfo$
 */

#ifndef LL_BITPACK_H
#define LL_BITPACK_H

#include "llerror.h"

constexpr U32 MAX_DATA_BITS = 8;

class LLBitPack
{
protected:
	LOG_CLASS(LLBitPack);

public:
	LL_INLINE LLBitPack(U8* buffer, U32 max_size)
	:	mBuffer(buffer),
		mBufferSize(0),
		mLoad(0),
		mLoadSize(0),
		mTotalBits(0),
		mMaxSize(max_size)
	{
	}

	LL_INLINE void resetBitPacking()
	{
		mLoad = 0;
		mLoadSize = 0;
		mTotalBits = 0;
		mBufferSize = 0;
	}

	U32 bitPack(U8* total_data, U32 total_dsize);
	U32 bitCopy(U8* total_data, U32 total_dsize);
	U32 bitUnpack(U8* total_retval, U32 total_dsize);
	U32 flushBitPack();

public:
	U8*	mBuffer;
	U32	mBufferSize;
	U8	mLoad;
	U32	mLoadSize;
	U32	mTotalBits;
	U32	mMaxSize;
};

#endif