llvocache.cpp
上传用户:king477883
上传日期:2021-03-01
资源大小:9553k
文件大小:4k
- /**
- * @file llvocache.cpp
- * @brief Cache of objects on the viewer.
- *
- * $LicenseInfo:firstyear=2003&license=viewergpl$
- *
- * Copyright (c) 2003-2010, 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.
- * $/LicenseInfo$
- */
- #include "llviewerprecompiledheaders.h"
- #include "llvocache.h"
- #include "llerror.h"
- //---------------------------------------------------------------------------
- // LLVOCacheEntry
- //---------------------------------------------------------------------------
- LLVOCacheEntry::LLVOCacheEntry(U32 local_id, U32 crc, LLDataPackerBinaryBuffer &dp)
- {
- mLocalID = local_id;
- mCRC = crc;
- mHitCount = 0;
- mDupeCount = 0;
- mCRCChangeCount = 0;
- mBuffer = new U8[dp.getBufferSize()];
- mDP.assignBuffer(mBuffer, dp.getBufferSize());
- mDP = dp;
- }
- LLVOCacheEntry::LLVOCacheEntry()
- {
- mLocalID = 0;
- mCRC = 0;
- mHitCount = 0;
- mDupeCount = 0;
- mCRCChangeCount = 0;
- mBuffer = NULL;
- mDP.assignBuffer(mBuffer, 0);
- }
- static inline void checkedRead(LLFILE *fp, void *data, size_t nbytes)
- {
- if (fread(data, 1, nbytes, fp) != nbytes)
- {
- llwarns << "Short read" << llendl;
- memset(data, 0, nbytes);
- }
- }
- LLVOCacheEntry::LLVOCacheEntry(LLFILE *fp)
- {
- S32 size;
- checkedRead(fp, &mLocalID, sizeof(U32));
- checkedRead(fp, &mCRC, sizeof(U32));
- checkedRead(fp, &mHitCount, sizeof(S32));
- checkedRead(fp, &mDupeCount, sizeof(S32));
- checkedRead(fp, &mCRCChangeCount, sizeof(S32));
- checkedRead(fp, &size, sizeof(S32));
- // Corruption in the cache entries
- if ((size > 10000) || (size < 1))
- {
- // We've got a bogus size, skip reading it.
- // We won't bother seeking, because the rest of this file
- // is likely bogus, and will be tossed anyway.
- llwarns << "Bogus cache entry, size " << size << ", aborting!" << llendl;
- mLocalID = 0;
- mCRC = 0;
- mBuffer = NULL;
- return;
- }
- mBuffer = new U8[size];
- checkedRead(fp, mBuffer, size);
- mDP.assignBuffer(mBuffer, size);
- }
- LLVOCacheEntry::~LLVOCacheEntry()
- {
- delete [] mBuffer;
- }
- // New CRC means the object has changed.
- void LLVOCacheEntry::assignCRC(U32 crc, LLDataPackerBinaryBuffer &dp)
- {
- if ( (mCRC != crc)
- ||(mDP.getBufferSize() == 0))
- {
- mCRC = crc;
- mHitCount = 0;
- mCRCChangeCount++;
- mDP.freeBuffer();
- mBuffer = new U8[dp.getBufferSize()];
- mDP.assignBuffer(mBuffer, dp.getBufferSize());
- mDP = dp;
- }
- }
- LLDataPackerBinaryBuffer *LLVOCacheEntry::getDP(U32 crc)
- {
- if ( (mCRC != crc)
- ||(mDP.getBufferSize() == 0))
- {
- //llinfos << "Not getting cache entry, invalid!" << llendl;
- return NULL;
- }
- mHitCount++;
- return &mDP;
- }
- void LLVOCacheEntry::recordHit()
- {
- mHitCount++;
- }
- void LLVOCacheEntry::dump() const
- {
- llinfos << "local " << mLocalID
- << " crc " << mCRC
- << " hits " << mHitCount
- << " dupes " << mDupeCount
- << " change " << mCRCChangeCount
- << llendl;
- }
- static inline void checkedWrite(LLFILE *fp, const void *data, size_t nbytes)
- {
- if (fwrite(data, 1, nbytes, fp) != nbytes)
- {
- llwarns << "Short write" << llendl;
- }
- }
- void LLVOCacheEntry::writeToFile(LLFILE *fp) const
- {
- checkedWrite(fp, &mLocalID, sizeof(U32));
- checkedWrite(fp, &mCRC, sizeof(U32));
- checkedWrite(fp, &mHitCount, sizeof(S32));
- checkedWrite(fp, &mDupeCount, sizeof(S32));
- checkedWrite(fp, &mCRCChangeCount, sizeof(S32));
- S32 size = mDP.getBufferSize();
- checkedWrite(fp, &size, sizeof(S32));
- checkedWrite(fp, mBuffer, size);
- }