llcrc.h
上传用户:king477883
上传日期:2021-03-01
资源大小:9553k
文件大小:2k
- /**
- * @file llcrc.h
- * @brief LLCRC class header file.
- *
- * $LicenseInfo:firstyear=2002&license=viewergpl$
- *
- * Copyright (c) 2002-2010, 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 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