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343 lines
7.1 KiB
343 lines
7.1 KiB
/*++
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Copyright (c) 2000 Microsoft Corporation
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Module Name:
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hashtable.h
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Abstract:
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Implementation of:
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CPool<T>, CStringPool, CHashTableElement<T>
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Author:
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Mohit Srivastava 10-Nov-2000
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Revision History:
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--*/
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#include "iisprov.h"
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template CPool<METABASE_PROPERTY>;
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template CHashTable<METABASE_PROPERTY*>;
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template CPool<WMI_CLASS>;
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template CHashTable<WMI_CLASS*>;
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template CPool<WMI_ASSOCIATION>;
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template CHashTable<WMI_ASSOCIATION*>;
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template CPool<METABASE_KEYTYPE>;
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template CHashTable<METABASE_KEYTYPE*>;
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template CArrayPool<wchar_t, ::STRING_POOL_STRING_SIZE>;
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template CArrayPool<METABASE_PROPERTY*, 10>;
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template CArrayPool<BYTE, 10>;
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template CPool<METABASE_KEYTYPE_NODE>;
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//
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// CPool<T>
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//
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template <class T>
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HRESULT CPool<T>::Initialize(ULONG i_iFirstBucketSize)
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/*++
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Synopsis:
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Set up data structures:
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Initialize array to size CPool::ARRAY_SIZE
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Create first bucket of size i_iFirstBucketSize
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Arguments: [i_iFirstBucketSize] -
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Return Value:
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S_OK, E_OUTOFMEMORY
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--*/
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{
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DBG_ASSERT(m_bInitCalled == false);
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DBG_ASSERT(m_bInitSuccessful == false);
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m_bInitCalled = true;
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HRESULT hr = S_OK;
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m_apBuckets = new T*[ARRAY_SIZE];
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if(m_apBuckets == NULL)
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{
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hr = E_OUTOFMEMORY;
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goto exit;
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}
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m_iArraySize = ARRAY_SIZE;
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m_iArrayPosition = 1;
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m_apBuckets[0] = new T[i_iFirstBucketSize];
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if(m_apBuckets[0] == NULL)
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{
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hr = E_OUTOFMEMORY;
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goto exit;
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}
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m_iCurrentBucketSize = i_iFirstBucketSize;
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m_iFirstBucketSize = i_iFirstBucketSize;
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m_iCurrentBucketPosition = 0;
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exit:
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if(SUCCEEDED(hr))
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{
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m_bInitSuccessful = true;
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}
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return hr;
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}
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template <class T>
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HRESULT CPool<T>::GetNewElement(T** o_ppElement)
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/*++
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Synopsis:
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Normally, just a matter of returning pointer to next spot in bucket.
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May have to create a new bucket and/or grow the array, however.
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Arguments: [o_ppElement] -
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Return Value:
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S_OK, E_OUTOFMEMORY
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--*/{
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DBG_ASSERT(m_bInitCalled == true);
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DBG_ASSERT(m_bInitSuccessful == true);
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DBG_ASSERT(o_ppElement != NULL);
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HRESULT hr = S_OK;
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//
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// Check to see if we need to move on to the next bucket
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//
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if(m_iCurrentBucketPosition == m_iCurrentBucketSize)
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{
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//
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// Check to see if we need to grow the array
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//
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if(m_iArrayPosition == m_iArraySize)
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{
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T** apBucketsNew;
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apBucketsNew = new T*[m_iArraySize*2];
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if(apBucketsNew == NULL)
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{
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return E_OUTOFMEMORY;
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}
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memcpy(apBucketsNew, m_apBuckets, m_iArraySize * sizeof(T*));
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delete [] m_apBuckets;
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m_apBuckets = apBucketsNew;
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m_iArraySize *= 2;
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}
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T* pBucketNew;
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pBucketNew = new T[m_iCurrentBucketSize*2];
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if(pBucketNew == NULL)
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{
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return E_OUTOFMEMORY;
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}
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m_apBuckets[m_iArrayPosition] = pBucketNew;
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m_iCurrentBucketSize *= 2;
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m_iCurrentBucketPosition = 0;
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m_iArrayPosition++;
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}
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*o_ppElement = &m_apBuckets[m_iArrayPosition-1][m_iCurrentBucketPosition];
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m_iCurrentBucketPosition++;
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return hr;
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}
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template <class T>
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T* CPool<T>::Lookup(ULONG i_idx) const
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/*++
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Synopsis:
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Looks up data in pool by index
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Arguments: [i_idx] - Valid Range is 0 to GetUsed()-1
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Return Value:
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A pointer to the data unless i_idx is out of range.
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--*/
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{
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DBG_ASSERT(m_bInitCalled == true);
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DBG_ASSERT(m_bInitSuccessful == true);
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//
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// Total element capacity of all buckets up to and including the current one
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// in the for loop below
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//
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ULONG iElementsCovered = 0;
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ULONG iBucketPos = 0;
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if (i_idx >= GetUsed())
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{
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return NULL;
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}
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for(ULONG i = 0; i < m_iArrayPosition; i++)
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{
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iElementsCovered = iElementsCovered + (1 << i)*(m_iFirstBucketSize);
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if(i_idx < iElementsCovered)
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{
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iBucketPos =
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i_idx - ( iElementsCovered - (1 << i)*(m_iFirstBucketSize) );
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return &m_apBuckets[i][iBucketPos];
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}
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}
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return NULL;
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}
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//
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// CArrayPool
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//
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template <class T, ULONG size>
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HRESULT CArrayPool<T, size>::Initialize()
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/*++
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Synopsis:
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should only be called once
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Return Value:
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--*/
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{
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HRESULT hr = S_OK;
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hr = m_PoolFixedSize.Initialize(FIRST_BUCKET_SIZE);
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if(FAILED(hr))
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{
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return hr;
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}
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hr = m_PoolDynamic.Initialize(FIRST_BUCKET_SIZE);
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if(FAILED(hr))
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{
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return hr;
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}
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return hr;
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}
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template <class T, ULONG size>
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HRESULT CArrayPool<T, size>::GetNewArray(ULONG i_cElem, T** o_ppElem)
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/*++
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Synopsis:
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Fills o_ppElem from either the fixedsize or dynamic pool based on the
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requested size.
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Arguments: [i_cElem] - number of elements caller wants in new array
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[o_ppElem] - receives the new array
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Return Value:
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--*/
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{
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DBG_ASSERT(o_ppElem != NULL);
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HRESULT hr = S_OK;
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T** ppNew = NULL;
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T* pNew = NULL;
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if(i_cElem <= size)
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{
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hr = m_PoolFixedSize.GetNewElement((CArrayPoolEntry<T,size>**)&pNew);
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if(FAILED(hr))
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{
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return hr;
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}
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ppNew = &pNew;
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}
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else
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{
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hr = m_PoolDynamic.GetNewElement(&ppNew);
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if(FAILED(hr))
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{
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return hr;
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}
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*ppNew = NULL;
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*ppNew = new T[i_cElem+1];
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if(*ppNew == NULL)
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{
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return E_OUTOFMEMORY;
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}
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}
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*o_ppElem = *ppNew;
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return hr;
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}
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//
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// for debugging only
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// if msb set, goto dynamic pool
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// else use fixedsize pool
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//
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template <class T, ULONG size>
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T* CArrayPool<T, size>::Lookup(ULONG i_idx) const
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{
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ULONG i_msb;
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i_msb = i_idx >> 31;
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if(i_msb == 0)
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{
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return (T *)(m_PoolFixedSize.Lookup(i_idx));
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}
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else {
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T** pElem = m_PoolDynamic.Lookup( i_idx - (ULONG)(1 << 31) );
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if(pElem == NULL)
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{
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return NULL;
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}
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else
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{
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return *pElem;
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}
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}
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}
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//
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// CStringPool
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//
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HRESULT CStringPool::GetNewString(LPCWSTR i_wsz, ULONG i_cch, LPWSTR* o_pwsz)
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{
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DBG_ASSERT(o_pwsz != NULL);
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HRESULT hr;
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hr = GetNewArray(i_cch+1, o_pwsz);
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if(FAILED(hr))
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{
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return hr;
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}
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memcpy(*o_pwsz, i_wsz, (i_cch+1)*sizeof(wchar_t));
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return hr;
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}
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HRESULT CStringPool::GetNewString(LPCWSTR i_wsz, LPWSTR* o_pwsz)
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{
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return GetNewString(i_wsz, wcslen(i_wsz), o_pwsz);
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}
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//
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// for debugging only
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//
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void CStringPool::ToConsole() const
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{
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ULONG i;
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for(i = 0; i < m_PoolFixedSize.GetUsed(); i++)
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{
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wprintf(L"%s\n", Lookup(i));
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}
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for(i = 0; i < m_PoolDynamic.GetUsed(); i++)
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{
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wprintf( L"%s\n", Lookup( i | (1 << 31) ) );
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}
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}
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