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/**
* @file llcrc.h
* @brief LLCRC class header file.
*
* $LicenseInfo:firstyear=2002&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2010, Linden Research, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License only.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
* $/LicenseInfo$
*/
#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);
// LL_INFOS() << "File crc: " << crc.getCRC() << LL_ENDL;
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
class LL_COMMON_API 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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