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196 lines
3.0 KiB
196 lines
3.0 KiB
/*++
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Copyright (c) 1994 Microsoft Corporation
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All rights reserved.
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Module Name:
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memblock.cxx
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Abstract:
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Memory allocater for chunks of read only memory.
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Author:
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Albert Ting (AlbertT) 30-Aug-1994
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Revision History:
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--*/
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#include "spllibp.hxx"
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#pragma hdrstop
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TMemBlock::
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TMemBlock(
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UINT uGranularity,
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DWORD fdwFlags) :
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_uGranularity(uGranularity),
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_pIterBlock(NULL),
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_pIterData(NULL),
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_dwCount(0),
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_fdwFlags(fdwFlags)
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{
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DWORD dwSize = dwBlockHeaderSize() + _uGranularity;
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if( _fdwFlags & kFlagGlobalNew ){
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_pLast = (PBLOCK) new BYTE[dwSize];
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} else {
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_pLast = (PBLOCK)AllocMem( dwSize );
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}
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_pFirst = _pLast;
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if (_pFirst) {
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_pFirst->pNext = NULL;
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_dwNextFree = dwBlockHeaderSize();
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}
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}
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TMemBlock::
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~TMemBlock()
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{
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PBLOCK pBlock;
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PBLOCK pBlockNext;
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for (pBlock = _pFirst; pBlock; pBlock = pBlockNext) {
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pBlockNext = pBlock;
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if( _fdwFlags & kFlagGlobalNew ){
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delete [] (PBYTE)pBlock;
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} else {
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//
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// Our Delete must mirror the New.
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//
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FreeMem(pBlock);
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}
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}
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}
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PVOID
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TMemBlock::
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pvAlloc(
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DWORD dwSize
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)
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{
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PDATA pData;
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//
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// If out of memory, fail.
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//
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if (!_pFirst) {
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goto FailOOM;
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}
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dwSize = Align(dwSize + dwDataHeaderSize());
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SPLASSERT(dwSize <= _uGranularity);
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if (dwSize + _dwNextFree > _uGranularity) {
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DWORD dwSize = dwBlockHeaderSize() + _uGranularity;
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//
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// Must allocate a new block
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//
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if( _fdwFlags & kFlagGlobalNew ){
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_pLast->pNext = (PBLOCK) new BYTE[dwSize];
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} else {
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_pLast->pNext = (PBLOCK)AllocMem( dwSize );
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}
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if (!_pLast->pNext) {
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goto FailOOM;
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}
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_pLast = _pLast->pNext;
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_pLast->pNext = NULL;
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_dwNextFree = dwBlockHeaderSize();
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}
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//
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// We have enough space in this link now;
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// update everything.
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//
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pData = (PDATA)((PBYTE)_pLast + _dwNextFree);
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pData->dwSize = dwSize;
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_dwNextFree += dwSize;
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_pLast->pDataLast = pData;
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_dwCount++;
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return pvDataToUser(pData);
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FailOOM:
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SetLastError(ERROR_NOT_ENOUGH_MEMORY);
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return NULL;
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}
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PVOID
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TMemBlock::
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pvFirst(
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VOID
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)
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{
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if (!_dwCount) {
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return NULL;
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}
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_pIterBlock = _pFirst;
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_pIterData = pBlockToData(_pIterBlock);
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_dwIterCount = 0;
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return pvDataToUser(_pIterData);
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}
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PVOID
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TMemBlock::
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pvIter(
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VOID
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)
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{
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_dwIterCount++;
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if (_dwIterCount == _dwCount)
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return NULL;
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//
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// Go to next block. If we're at the last pData, go to next block.
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//
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if (_pIterData == _pIterBlock->pDataLast) {
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_pIterBlock = _pIterBlock->pNext;
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_pIterData = pBlockToData(_pIterBlock);
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} else {
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_pIterData = pDataNext(_pIterData);
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}
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return pvDataToUser(_pIterData);
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}
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UINT
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TMemBlock::
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uSize(
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PVOID pvUser
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) const
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{
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return pvUserToData(pvUser)->dwSize;
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}
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