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/**
* @file llcrc.h
* @brief LLCRC class header file.
*
* $LicenseInfo:firstyear=2002&license=viewergpl$
*
* Copyright (c) 2002-2009, 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_LLCRC_H
#define LL_LLCRC_H
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Class llcrc
//
// Simple 32 bit crc. To use, instantiate an LLCRC instance and feed
// it the bytes you want to check. It will update the internal crc as
// you go, and you can qery it at the end. As a horribly inefficient
// example (don't try this at work kids):
//
// LLCRC crc;
// FILE* fp = LLFile::fopen(filename,"rb");
// while(!feof(fp)) {
// crc.update(fgetc(fp));
// }
// fclose(fp);
// llinfos << "File crc: " << crc.getCRC() << llendl;
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
class LLCRC
{
protected:
U32 mCurrent;
public:
LLCRC();
U32 getCRC() const;
void update(U8 next_byte);
void update(const U8* buffer, size_t buffer_size);
void update(const std::string& filename);
#ifdef _DEBUG
// This function runs tests to make sure the crc is
// working. Returns TRUE if it is.
static BOOL testHarness();
#endif
};
#endif // LL_LLCRC_H
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