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/**
* @file llvocache.cpp
* @brief Cache of objects on the viewer.
*
* $LicenseInfo:firstyear=2003&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2010, Linden Research, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License only.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
* $/LicenseInfo$
*/
#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);
}
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