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753 lines
18 KiB
753 lines
18 KiB
/*---------------------------------------------------------------------------
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File: VarMap.cpp
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Comments: This class implements a hash table which contains the keys stored in the varset,
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along with their values.
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CaseSensitive property - The case of each key is preserved as it was when
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the key was first added to the map. The hash function is not case sensitive,
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so the CaseSensitive property can be toggled on and off without rehashing the data.
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Optional indexing to allow for fast enumeration in alphabetical order by key.
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This will add overhead to insert operations. Without indexing, the contents of
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the map can be enumerated, but they will be in arbitrary order.
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Stream I/O functions for persistance.
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(c) Copyright 1995-1998, Mission Critical Software, Inc., All Rights Reserved
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Proprietary and confidential to Mission Critical Software, Inc.
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REVISION LOG ENTRY
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Revision By: Christy Boles
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Revised on 11/19/98 18:31:57
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---------------------------------------------------------------------------
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*/
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#include "stdafx.h"
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#include <afx.h>
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#include <afxplex_.h>
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#ifdef _DEBUG
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#define new DEBUG_NEW
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#undef THIS_FILE
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static char THIS_FILE[] = __FILE__;
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#endif
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#include "VarMap.h"
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#ifdef STRIPPED_VARSET
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#include "NoMcs.h"
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#else
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#pragma warning (push,3)
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#include "McString.h"
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#include "McLog.h"
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#pragma warning (pop)
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using namespace McString;
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#endif
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static inline void FreeString(CString* pOldData)
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{
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pOldData->~CString();
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}
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const UINT HashSizes[] = { 17, 251, 1049, 10753, 100417, 1299673 , 0 };
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CMapStringToVar::CMapStringToVar(BOOL isCaseSensitive, BOOL isIndexed, BOOL allowRehash,int nBlockSize)
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{
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ASSERT(nBlockSize > 0);
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m_pHashTable = NULL;
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m_nHashTableSize = HashSizes[0]; // default size
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m_nCount = 0;
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m_pFreeList = NULL;
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m_pBlocks = NULL;
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m_nBlockSize = nBlockSize;
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m_CaseSensitive = isCaseSensitive;
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m_Indexed = isIndexed;
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m_AllowRehash = allowRehash;
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}
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inline UINT CMapStringToVar::HashKey(LPCTSTR key) const
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{
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UINT nHash = 0;
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while (*key)
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{
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nHash = (nHash<<5) + nHash + toupper(*key++);
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}
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return nHash;
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}
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void CMapStringToVar::InitHashTable(
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UINT nHashSize, BOOL bAllocNow)
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//
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// Used to force allocation of a hash table or to override the default
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// hash table size (which is fairly small)
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{
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ASSERT_VALID(this);
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ASSERT(m_nCount == 0);
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ASSERT(nHashSize > 0);
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if (m_pHashTable != NULL)
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{
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// free hash table
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delete[] m_pHashTable;
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m_pHashTable = NULL;
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}
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if (bAllocNow)
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{
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m_pHashTable = new CHashItem* [nHashSize];
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if (!m_pHashTable)
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return;
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memset(m_pHashTable, 0, sizeof(CHashItem*) * nHashSize);
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}
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m_nHashTableSize = nHashSize;
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}
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void CMapStringToVar::ResizeTable()
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{
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// get the new size
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UINT nHashSize = 0;
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// find the current hash size in the array
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for ( int i = 0 ; HashSizes[i] <= m_nHashTableSize ; i++ )
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{
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if ( HashSizes[i] == m_nHashTableSize )
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{
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nHashSize = HashSizes[i+1];
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break;
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}
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}
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if ( nHashSize )
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{
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MC_LOGIF(VARSET_LOGLEVEL_INTERNAL,"Increasing hash size to "<< makeStr(nHashSize) );
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CHashItem ** oldHashTable = m_pHashTable;
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m_pHashTable = new CHashItem* [nHashSize];
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if (!m_pHashTable)
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return;
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memset(m_pHashTable,0, sizeof(CHashItem*) * nHashSize );
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// Rehash the existing items into the new table
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for ( UINT bucket = 0 ; bucket < m_nHashTableSize ; bucket++ )
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{
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CHashItem* pAssoc;
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CHashItem* pNext;
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for (pAssoc = oldHashTable[bucket]; pAssoc != NULL; pAssoc = pNext)
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{
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pNext = pAssoc->pNext;
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// Re-hash, and insert into new table
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pAssoc->nHashValue = HashKey(pAssoc->key) % nHashSize;
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pAssoc->pNext = m_pHashTable[pAssoc->nHashValue];
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m_pHashTable[pAssoc->nHashValue] = pAssoc;
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}
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}
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// cleanup the old table
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delete [] oldHashTable;
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m_nHashTableSize = nHashSize;
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}
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else
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{
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MC_LOG("Table size is "<< makeStr(m_nHashTableSize) << ". Larger hash size not found, disabling rehashing.");
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m_AllowRehash = FALSE;
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}
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}
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void CMapStringToVar::RemoveAll()
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{
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if ( m_Indexed )
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{
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m_Index.RemoveAll();
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}
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if (m_pHashTable != NULL)
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{
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// remove and destroy each element
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for (UINT nHash = 0; nHash < m_nHashTableSize; nHash++)
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{
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CHashItem* pAssoc;
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for (pAssoc = m_pHashTable[nHash]; pAssoc != NULL;
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pAssoc = pAssoc->pNext)
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{
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FreeString(&pAssoc->key);
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}
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}
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// free hash table
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delete [] m_pHashTable;
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m_pHashTable = NULL;
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}
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m_nCount = 0;
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m_pFreeList = NULL;
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m_pBlocks->FreeDataChain();
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m_pBlocks = NULL;
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}
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CMapStringToVar::~CMapStringToVar()
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{
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RemoveAll();
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ASSERT(m_nCount == 0);
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}
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/////////////////////////////////////////////////////////////////////////////
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// Assoc helpers
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CHashItem*
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CMapStringToVar::NewAssoc()
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{
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if (m_pFreeList == NULL)
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{
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// add another block
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CPlex* newBlock = CPlex::Create(m_pBlocks, m_nBlockSize,
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sizeof(CHashItem));
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// chain them into free list
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CHashItem* pAssoc = (CHashItem*) newBlock->data();
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// free in reverse order to make it easier to debug
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pAssoc += m_nBlockSize - 1;
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for (int i = m_nBlockSize-1; i >= 0; i--, pAssoc--)
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{
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pAssoc->pNext = m_pFreeList;
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m_pFreeList = pAssoc;
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}
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}
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ASSERT(m_pFreeList != NULL); // we must have something
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CHashItem* pAssoc = m_pFreeList;
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m_pFreeList = m_pFreeList->pNext;
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m_nCount++;
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ASSERT(m_nCount > 0); // make sure we don't overflow
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memcpy(&pAssoc->key, &afxEmptyString, sizeof(CString));
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pAssoc->value = 0;
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return pAssoc;
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}
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void CMapStringToVar::FreeAssoc(CHashItem* pAssoc)
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{
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FreeString(&pAssoc->key); // free up string data
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pAssoc->pNext = m_pFreeList;
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m_pFreeList = pAssoc;
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m_nCount--;
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MCSASSERT(m_nCount >= 0); // make sure we don't underflow
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// if no more elements, cleanup completely
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if (m_nCount == 0)
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RemoveAll();
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}
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CHashItem*
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CMapStringToVar::GetAssocAt(LPCTSTR key, UINT& nHash) const
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// find association (or return NULL)
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{
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nHash = HashKey(key) % m_nHashTableSize;
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if (m_pHashTable == NULL)
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return NULL;
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// see if it exists
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CHashItem* pAssoc;
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for (pAssoc = m_pHashTable[nHash]; pAssoc != NULL; pAssoc = pAssoc->pNext)
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{
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if ( m_CaseSensitive )
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{
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if (pAssoc->key == key)
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return pAssoc;
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}
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else
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{
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if ( ! pAssoc->key.CompareNoCase(key) )
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return pAssoc;
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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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BOOL CMapStringToVar::Lookup(LPCTSTR key, CVarData*& rValue) const
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{
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ASSERT_VALID(this);
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UINT nHash;
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CHashItem* pAssoc = GetAssocAt(key, nHash);
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if (pAssoc == NULL)
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return FALSE; // not in map
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rValue = pAssoc->value;
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return TRUE;
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}
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BOOL CMapStringToVar::LookupKey(LPCTSTR key, LPCTSTR& rKey) const
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{
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ASSERT_VALID(this);
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UINT nHash;
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CHashItem* pAssoc = GetAssocAt(key, nHash);
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if (pAssoc == NULL)
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return FALSE; // not in map
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rKey = pAssoc->key;
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return TRUE;
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}
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CVarData*& CMapStringToVar::operator[](LPCTSTR key)
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{
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ASSERT_VALID(this);
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UINT nHash;
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CHashItem* pAssoc;
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// Grow the hash table, if necessary
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if ( m_AllowRehash && ( m_nCount > 2 * m_nHashTableSize ) )
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{
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ResizeTable();
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}
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if ((pAssoc = GetAssocAt(key, nHash)) == NULL)
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{
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if (m_pHashTable == NULL)
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InitHashTable(m_nHashTableSize);
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// it doesn't exist, add a new Association
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pAssoc = NewAssoc();
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pAssoc->nHashValue = nHash;
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pAssoc->key = key;
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// put into hash table
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pAssoc->pNext = m_pHashTable[nHash];
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m_pHashTable[nHash] = pAssoc;
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if ( m_Indexed )
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{
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pAssoc->pIndex = m_Index.Insert(pAssoc);
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}
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else
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{
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pAssoc->pIndex = NULL;
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}
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}
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return pAssoc->value; // return new reference
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}
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void CMapStringToVar::SetIndexed(BOOL val)
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{
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POSITION pos = GetStartPosition();
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CString key;
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CVarData * value;
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if ( ! m_Indexed && val )
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{
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BuildIndex();
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}
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m_Indexed = val;
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// recursively update children
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while ( pos )
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{
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GetNextAssoc(pos,key,value);
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if ( value )
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{
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value->SetIndexed(val);
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}
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}
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}
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void CMapStringToVar::BuildIndex()
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{
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// delete any old entries
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m_Index.RemoveAll();
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CHashItem * pAssoc;
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POSITION pos = GetStartPosition();
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CString key;
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CVarData * value;
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UINT hash;
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while ( pos )
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{
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GetNextAssoc(pos,key,value);
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pAssoc = GetAssocAt(key,hash);
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if ( pAssoc )
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{
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pAssoc->pIndex = m_Index.Insert(pAssoc);
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if ( value->HasChildren() )
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{
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value->GetChildren()->SetIndexed(TRUE);
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}
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}
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}
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}
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BOOL CMapStringToVar::RemoveKey(LPCTSTR key)
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// remove key - return TRUE if removed
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{
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ASSERT_VALID(this);
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if (m_pHashTable == NULL)
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return FALSE; // nothing in the table
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CHashItem** ppAssocPrev;
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ppAssocPrev = &m_pHashTable[HashKey(key) % m_nHashTableSize];
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CHashItem* pAssoc;
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for (pAssoc = *ppAssocPrev; pAssoc != NULL; pAssoc = pAssoc->pNext)
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{
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if ( (m_CaseSensitive && (pAssoc->key == key) || !m_CaseSensitive && pAssoc->key.CompareNoCase(key) ) )
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{
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// remove it
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*ppAssocPrev = pAssoc->pNext; // remove from list
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FreeAssoc(pAssoc);
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return TRUE;
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}
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ppAssocPrev = &pAssoc->pNext;
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}
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return FALSE; // not found
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}
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/////////////////////////////////////////////////////////////////////////////
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// Iterating
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void CMapStringToVar::GetNextAssoc(POSITION& rNextPosition,
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CString& rKey, CVarData*& rValue) const
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{
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ASSERT_VALID(this);
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ASSERT(m_pHashTable != NULL); // never call on empty map
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CHashItem* pAssocRet = (CHashItem*)rNextPosition;
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ASSERT(pAssocRet != NULL);
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if (pAssocRet == (CHashItem*) BEFORE_START_POSITION)
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{
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// find the first association
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for (UINT nBucket = 0; nBucket < m_nHashTableSize; nBucket++)
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if ((pAssocRet = m_pHashTable[nBucket]) != NULL)
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break;
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ASSERT(pAssocRet != NULL); // must find something
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}
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// find next association
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ASSERT(AfxIsValidAddress(pAssocRet, sizeof(CHashItem)));
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CHashItem* pAssocNext;
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if ((pAssocNext = pAssocRet->pNext) == NULL)
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{
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// go to next bucket
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for (UINT nBucket = pAssocRet->nHashValue + 1;
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nBucket < m_nHashTableSize; nBucket++)
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if ((pAssocNext = m_pHashTable[nBucket]) != NULL)
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break;
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}
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rNextPosition = (POSITION) pAssocNext;
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// fill in return data
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rKey = pAssocRet->key;
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rValue = pAssocRet->value;
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}
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/////////////////////////////////////////////////////////////////////////////
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// Serialization
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void CMapStringToVar::Serialize(CArchive& ar)
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{
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ASSERT_VALID(this);
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CObject::Serialize(ar);
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if (ar.IsStoring())
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{
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ar.WriteCount(m_nCount);
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if (m_nCount == 0)
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return; // nothing more to do
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ASSERT(m_pHashTable != NULL);
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for (UINT nHash = 0; nHash < m_nHashTableSize; nHash++)
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{
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CHashItem* pAssoc;
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for (pAssoc = m_pHashTable[nHash]; pAssoc != NULL;
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pAssoc = pAssoc->pNext)
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{
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// ar << pAssoc->key;
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// ar << pAssoc->value;
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}
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}
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}
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else
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{
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// DWORD nNewCount = ar.ReadCount();
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// CString newKey;
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// CVarData* newValue;
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// while (nNewCount--)
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// {
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// ar >> newKey;
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// ar >> newValue;
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// SetAt(newKey, newValue);
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// }
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}
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}
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void CMapStringToVar::McLogInternalDiagnostics(CString keyName)
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{
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MC_LOGBLOCK("HashTable");
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MC_LOG(" " << String(keyName) << "Count="<<makeStr(m_nCount) << " Case Sensitive="<< (m_CaseSensitive?"TRUE":"FALSE") << " Indexed="<<(m_Indexed?"TRUE":"FALSE") );
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MC_LOG("TableSize="<<makeStr(m_nHashTableSize));
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for ( UINT i = 0 ; i < m_nHashTableSize ; i++ )
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{
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CHashItem * pAssoc;
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MC_LOG("Bucket " << makeStr(i));
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for ( pAssoc = m_pHashTable[i] ; pAssoc != NULL ; pAssoc=pAssoc->pNext)
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{
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if ( pAssoc->value )
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{
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CString subKey;
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subKey = keyName;
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if ( ! subKey.IsEmpty() )
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{
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subKey += _T(".");
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}
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subKey += pAssoc->key;
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pAssoc->value->McLogInternalDiagnostics(subKey);
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}
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if ( keyName.IsEmpty() )
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{
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MC_LOG(" Address="<< makeStr(pAssoc,L"0x%lx") << " Key="<< String(pAssoc->key));
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}
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else
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{
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MC_LOG(" Address="<< makeStr(pAssoc,L"0x%lx") << " Key="<< String(keyName) << "."<< String(pAssoc->key));
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}
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MC_LOG(" ValueAddress=" << makeStr(pAssoc->value,L"0x%lx") << " IndexAddress="<<makeStr(pAssoc->pIndex,L"0x%lx"));
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}
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}
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if ( m_Indexed )
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{
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m_Index.McLogInternalDiagnostics(keyName);
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}
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}
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HRESULT CMapStringToVar::WriteToStream(LPSTREAM pS)
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{
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HRESULT hr;
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ULONG result;
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CComBSTR str;
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do {
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hr = pS->Write(&m_nCount,(sizeof m_nCount),&result);
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if ( FAILED(hr) )
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break;
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if ( m_nCount )
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{
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for ( UINT nHash = 0 ; nHash < m_nHashTableSize ; nHash++ )
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{
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CHashItem * pAssoc;
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for ( pAssoc = m_pHashTable[nHash]; pAssoc != NULL ; pAssoc=pAssoc->pNext)
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{
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// write the key
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str = pAssoc->key;
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hr = str.WriteToStream(pS);
|
|
if ( FAILED(hr) )
|
|
break;
|
|
// then the value
|
|
hr = pAssoc->value->WriteToStream(pS);
|
|
if ( FAILED(hr) )
|
|
break;
|
|
}
|
|
if ( FAILED(hr) )
|
|
break;
|
|
}
|
|
}
|
|
}while ( FALSE );
|
|
|
|
return hr;
|
|
}
|
|
|
|
|
|
HRESULT CMapStringToVar::ReadFromStream(LPSTREAM pS)
|
|
{
|
|
HRESULT hr;
|
|
ULONG result;
|
|
CComBSTR str;
|
|
int count;
|
|
do {
|
|
hr = pS->Read(&count,(sizeof count),&result);
|
|
if ( FAILED(hr) )
|
|
break;
|
|
|
|
if ( count )
|
|
{
|
|
// Find the closest hash table size to our count
|
|
UINT nHashSize = HashSizes[0];
|
|
|
|
|
|
for ( int size = 0 ; HashSizes[size] != 0 && nHashSize < (UINT)count ; size++ )
|
|
{
|
|
nHashSize = HashSizes[size];
|
|
}
|
|
|
|
InitHashTable(nHashSize);
|
|
for ( int i = 0 ; i < count ; i++ )
|
|
{
|
|
CString key;
|
|
CVarData * pObj = new CVarData;
|
|
if (!pObj)
|
|
return HRESULT_FROM_WIN32(ERROR_NOT_ENOUGH_MEMORY);
|
|
|
|
pObj->SetCaseSensitive(m_CaseSensitive);
|
|
pObj->SetIndexed(m_Indexed);
|
|
hr = str.ReadFromStream(pS);
|
|
if ( FAILED(hr) )
|
|
break;
|
|
key = str;
|
|
str.Empty();
|
|
hr = pObj->ReadFromStream(pS);
|
|
if ( FAILED(hr) )
|
|
break;
|
|
SetAt(key,pObj);
|
|
}
|
|
}
|
|
}while ( FALSE );
|
|
return hr;
|
|
}
|
|
|
|
DWORD
|
|
CMapStringToVar::CalculateStreamedLength()
|
|
{
|
|
DWORD len = (sizeof m_nCount);
|
|
|
|
if ( m_nCount )
|
|
{
|
|
for ( UINT nHash = 0 ; nHash < m_nHashTableSize ; nHash++ )
|
|
{
|
|
CHashItem * pAssoc;
|
|
|
|
for ( pAssoc = m_pHashTable[nHash]; pAssoc != NULL ; pAssoc=pAssoc->pNext)
|
|
{
|
|
// add the length of the string
|
|
len += (sizeof TCHAR)*(pAssoc->key.GetLength() + 2);
|
|
|
|
// and the value
|
|
if ( pAssoc->value)
|
|
{
|
|
len += pAssoc->value->CalculateStreamedLength();
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return len;
|
|
}
|
|
|
|
long
|
|
CMapStringToVar::CountItems()
|
|
{
|
|
long count = 0;
|
|
|
|
if ( m_nCount )
|
|
{
|
|
for ( UINT nHash = 0 ; nHash < m_nHashTableSize ; nHash++ )
|
|
{
|
|
CHashItem * pAssoc;
|
|
|
|
for ( pAssoc = m_pHashTable[nHash]; pAssoc != NULL ; pAssoc=pAssoc->pNext)
|
|
{
|
|
// add the length of the string
|
|
count += pAssoc->value->CountItems();
|
|
}
|
|
}
|
|
}
|
|
return count;
|
|
}
|
|
/////////////////////////////////////////////////////////////////////////////
|
|
// Diagnostics
|
|
|
|
#ifdef _DEBUG
|
|
void CMapStringToVar::Dump(CDumpContext& dc) const
|
|
{
|
|
CObject::Dump(dc);
|
|
|
|
dc << "with " << m_nCount << " elements";
|
|
if (dc.GetDepth() > 0)
|
|
{
|
|
// Dump in format "[key] -> value"
|
|
CString key;
|
|
CVarData* val;
|
|
|
|
POSITION pos = GetStartPosition();
|
|
while (pos != NULL)
|
|
{
|
|
GetNextAssoc(pos, key, val);
|
|
dc << "\n\t[" << key << "] = " << val;
|
|
}
|
|
}
|
|
|
|
dc << "\n";
|
|
}
|
|
|
|
void CMapStringToVar::AssertValid() const
|
|
{
|
|
CObject::AssertValid();
|
|
|
|
if ( m_Indexed )
|
|
{
|
|
//m_Index.AssertValid(m_nCount);
|
|
}
|
|
ASSERT(m_nHashTableSize > 0);
|
|
ASSERT(m_nCount == 0 || m_pHashTable != NULL);
|
|
// non-empty map should have hash table
|
|
}
|
|
#endif //_DEBUG
|
|
|
|
#ifdef AFX_INIT_SEG
|
|
#pragma code_seg(AFX_INIT_SEG)
|
|
#endif
|
|
|
|
|
|
IMPLEMENT_SERIAL(CMapStringToVar, CObject, 0)
|
|
|
|
// BEGIN - STUFF FROM PLEX.CPP
|
|
/////////////////////////////////////////////////////////////////////////////
|
|
// CPlex
|
|
|
|
CPlex* PASCAL CPlex::Create(CPlex*& pHead, UINT nMax, UINT cbElement)
|
|
{
|
|
ASSERT(nMax > 0 && cbElement > 0);
|
|
CPlex* p = (CPlex*) new BYTE[sizeof(CPlex) + nMax * cbElement];
|
|
if (!p)
|
|
return NULL;
|
|
// may throw exception
|
|
p->pNext = pHead;
|
|
pHead = p; // change head (adds in reverse order for simplicity)
|
|
return p;
|
|
}
|
|
|
|
void CPlex::FreeDataChain() // free this one and links
|
|
{
|
|
CPlex* p = this;
|
|
while (p != NULL)
|
|
{
|
|
BYTE* bytes = (BYTE*) p;
|
|
CPlex* pNext = p->pNext;
|
|
delete[] bytes;
|
|
p = pNext;
|
|
}
|
|
}
|
|
|
|
// END - STUFF FROM PLEX.CPP
|