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