75 lines
2.3 KiB
C++
75 lines
2.3 KiB
C++
/**
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* @file llcrc.h
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* @brief LLCRC class header file.
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*
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* $LicenseInfo:firstyear=2002&license=viewergpl$
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*
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* Copyright (c) 2002-2009, Linden Research, Inc.
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*
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* Second Life Viewer Source Code
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* The source code in this file ("Source Code") is provided by Linden Lab
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* to you under the terms of the GNU General Public License, version 2.0
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* ("GPL"), unless you have obtained a separate licensing agreement
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* ("Other License"), formally executed by you and Linden Lab. Terms of
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* the GPL can be found in doc/GPL-license.txt in this distribution, or
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* online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
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*
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* There are special exceptions to the terms and conditions of the GPL as
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* it is applied to this Source Code. View the full text of the exception
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* in the file doc/FLOSS-exception.txt in this software distribution, or
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* online at
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* http://secondlifegrid.net/programs/open_source/licensing/flossexception
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*
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* By copying, modifying or distributing this software, you acknowledge
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* that you have read and understood your obligations described above,
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* and agree to abide by those obligations.
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*
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* ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
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* WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
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* COMPLETENESS OR PERFORMANCE.
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* $/LicenseInfo$
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*/
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#ifndef LL_LLCRC_H
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#define LL_LLCRC_H
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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// Class llcrc
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//
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// Simple 32 bit crc. To use, instantiate an LLCRC instance and feed
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// it the bytes you want to check. It will update the internal crc as
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// you go, and you can qery it at the end. As a horribly inefficient
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// example (don't try this at work kids):
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//
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// LLCRC crc;
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// FILE* fp = LLFile::fopen(filename,"rb");
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// while(!feof(fp)) {
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// crc.update(fgetc(fp));
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// }
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// fclose(fp);
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// llinfos << "File crc: " << crc.getCRC() << llendl;
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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class LL_COMMON_API LLCRC
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{
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protected:
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U32 mCurrent;
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public:
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LLCRC();
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U32 getCRC() const;
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void update(U8 next_byte);
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void update(const U8* buffer, size_t buffer_size);
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void update(const std::string& filename);
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#ifdef _DEBUG
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// This function runs tests to make sure the crc is
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// working. Returns TRUE if it is.
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static BOOL testHarness();
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#endif
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};
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#endif // LL_LLCRC_H
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