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