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899 lines
24 KiB
899 lines
24 KiB
//+----------------------------------------------------------------------------
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//
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// File: mem.cpp
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//
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// Module: CMUTIL.DLL
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//
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// Synopsis: Basic memory manipulation routines
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//
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// Copyright (c) 1997-1999 Microsoft Corporation
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//
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// Author: henryt Created 03/01/98
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//
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//+----------------------------------------------------------------------------
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#include "cmmaster.h"
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//+----------------------------------------------------------------------------
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// definitions
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//+----------------------------------------------------------------------------
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HANDLE g_hProcessHeap = NULL;
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#ifdef DEBUG
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LONG g_lMallocCnt = 0; // a counter to detect memory leak
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#endif
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#if defined(DEBUG) && defined(DEBUG_MEM)
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//////////////////////////////////////////////////////////////////////////////////
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//
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// If DEBUG_MEM is defined, track all the memory alloction in debug version.
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// Keep all the allocated memory blocks in the double link list.
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// Record the file name and line #, where memory is allocated.
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// Add extra tag at the beginning and end of the memory to watch for overwriten
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// The whole list is checked against corruption for every alloc/free operation
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//
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// The folowing three function is exported:
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// BOOL CheckDebugMem(void); // return TRUE for succeed
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// void* AllocDebugMem(long size,const char* lpFileName,int nLine);
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// BOOL FreeDebugMem(void* pMem); // return TRUE for succeed
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//
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///////////////////////////////////////////////////////////////////////////////////
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//#undef new
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#define MEMTAG 0xBEEDB77D // the tag before/after the block to watch for overwriten
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#define FREETAG 0xBD // the flag to fill freed memory
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#define TAGSIZE (sizeof(long))// Size of the tags appended to the end of the block
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//
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// memory block, a double link list
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//
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struct TMemoryBlock
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{
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TMemoryBlock* pPrev;
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TMemoryBlock* pNext;
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long size;
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const char* lpFileName; // The filename
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int nLine; // The line number
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long topTag; // The watch tag at the beginning
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// followed by:
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// BYTE data[nDataSize];
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// long bottomTag;
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BYTE* pbData() const // Return the pointer to the actual data
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{ return (BYTE*) (this + 1); }
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};
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//
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// The following internal function can be overwritten to change the behaivor
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//
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static void* MemAlloc(long size);
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static BOOL MemFree(void* pMem);
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static void LockDebugMem();
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static void UnlockDebugMem();
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//
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// Internal function
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//
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static BOOL RealCheckMemory(); // without call Enter/Leave critical Section
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static BOOL CheckBlock(const TMemoryBlock* pBlock) ;
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//
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// Internal data, protected by the lock to be multi-thread safe
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//
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static long nTotalMem; // Total bytes of memory allocated
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static long nTotalBlock; // Total # of blocks allocated
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static TMemoryBlock head; // The head of the double link list
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//
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// critical section to lock \ unlock DebugMemory
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// The constructor lock the memory, the destructor unlock the memory
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//
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class MemCriticalSection
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{
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public:
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MemCriticalSection()
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{
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LockDebugMem();
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}
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~MemCriticalSection()
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{
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UnlockDebugMem();
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}
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};
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static BOOL fDebugMemInited = FALSE; // whether the debug memory is initialized
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//+----------------------------------------------------------------------------
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//
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// Function: StartDebugMemory
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//
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// Synopsis: Initialize the data for debug memory
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//
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// Arguments: None
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//
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// Returns:
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//
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// History: fengsun Created Header 4/2/98
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//
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//+----------------------------------------------------------------------------
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static void StartDebugMemory()
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{
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fDebugMemInited = TRUE;
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head.pNext = head.pPrev = NULL;
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head.topTag = MEMTAG;
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head.size = 0;
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nTotalMem = 0;
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nTotalBlock = 0;
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}
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//+----------------------------------------------------------------------------
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//
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// Function: MemAlloc
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//
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// Synopsis: Allocate a block of memory. This function should be overwriten
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// if different allocation method is used
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//
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// Arguments: long size - size of the memory
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//
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// Returns: void* - the memory allocated or NULL
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//
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// History: fengsun Created Header 4/2/98
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//
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//+----------------------------------------------------------------------------
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static void* MemAlloc(long size)
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{
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return (HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, size));
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}
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//+----------------------------------------------------------------------------
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//
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// Function: MemFree
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//
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// Synopsis: Free a block of memory. This function should be overwriten
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// if different allocation method is used
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//
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// Arguments: void* pMem - The memory to be freed
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//
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// Returns: static BOOL - TRUE if succeeded
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//
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// History: Created Header 4/2/98
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//
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//+----------------------------------------------------------------------------
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static BOOL MemFree(void* pMem)
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{
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return HeapFree(GetProcessHeap(), 0, pMem);
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}
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//
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// Data / functions to provide mutual exclusion.
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// Can be overwritten, if other methed is to be used.
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//
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static BOOL fLockInited = FALSE; // whether the critical section is inialized
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static CRITICAL_SECTION cSection; // The critical section to protect the link list
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//+----------------------------------------------------------------------------
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//
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// Function: InitLock
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//
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// Synopsis: Initialize the memory lock which protects the doublely linked list
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// that contains all of the allocated memory blocks.
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//
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// Arguments: None
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//
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// Returns: Nothing
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//
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// History: quintinb Created Header 01/14/2000
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//
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//+----------------------------------------------------------------------------
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static void InitLock()
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{
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fLockInited = TRUE;
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InitializeCriticalSection(&cSection);
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}
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//+----------------------------------------------------------------------------
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//
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// Function: LockDebugMem
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//
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// Synopsis: Locks the doublely linked list that contains all of the
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// allocated memory blocks so that it can only be accessed by the
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// locking thread.
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//
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// Arguments: None
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//
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// Returns: Nothing
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//
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// History: quintinb Created Header 01/14/2000
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//
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//+----------------------------------------------------------------------------
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static void LockDebugMem()
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{
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static int i = 0;
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if(!fLockInited)
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{
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InitLock();
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}
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EnterCriticalSection(&cSection);
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}
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//+----------------------------------------------------------------------------
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//
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// Function: UnlockDebugMem
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//
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// Synopsis: Unlocks the doublely linked list that contains all of the
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// allocated memory blocks.
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//
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// Arguments: None
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//
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// Returns: Nothing
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//
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// History: quintinb Created Header 01/14/2000
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//
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//+----------------------------------------------------------------------------
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static void UnlockDebugMem()
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{
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LeaveCriticalSection(&cSection);
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}
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//+----------------------------------------------------------------------------
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//
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// Function: AllocDebugMem
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//
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// Synopsis: Process memory allocation request.
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// Check the link list. Allocate a larger block.
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// Record filename/linenumber, add tags and insert to the list
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//
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// Arguments: long size - Size of the memory to be allocated
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// const char* lpFileName - File name to be recorded
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// int nLine - Line number to be recorted
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//
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// Returns: CMUTILAPI void* - The memory allocated. Ready to use by the caller
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//
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// History: fengsun Created Header 4/2/98
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//
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//+----------------------------------------------------------------------------
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CMUTILAPI void* AllocDebugMem(long size,const char* lpFileName,int nLine)
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{
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if (!fDebugMemInited)
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{
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StartDebugMemory();
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}
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if (size<0)
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{
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CMASSERTMSG(FALSE,"Negtive size for alloc");
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return NULL;
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}
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if (size>1024*1024)
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{
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CMASSERTMSG(FALSE," size for alloc is great than 1Mb");
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return NULL;
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}
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if (size == 0)
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{
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CMTRACE("Allocate memory of size 0");
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return NULL;
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}
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//
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// Protect the access to the list
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//
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MemCriticalSection criticalSection;
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//
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// Check the link list first
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//
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if (!RealCheckMemory())
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{
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return NULL;
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}
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//
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// Allocate a large block to hold additional information
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//
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TMemoryBlock* pBlock = (TMemoryBlock*)MemAlloc(sizeof(TMemoryBlock)+size + TAGSIZE);
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if (!pBlock)
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{
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CMTRACE("Outof Memory");
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return NULL;
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}
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//
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// record filename/line/size, add tag to the beginning and end
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//
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pBlock->size = size;
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pBlock->topTag = MEMTAG;
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pBlock->lpFileName = lpFileName;
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pBlock->nLine = nLine;
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*(long*)(pBlock->pbData() + size) = MEMTAG;
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//
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// insert at head
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//
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pBlock->pNext = head.pNext;
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pBlock->pPrev = &head;
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if(head.pNext)
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head.pNext->pPrev = pBlock;
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head.pNext = pBlock;
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nTotalMem += size;
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nTotalBlock ++;
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return pBlock->pbData();
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}
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//+----------------------------------------------------------------------------
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//
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// Function: FreeDebugMem
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//
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// Synopsis: Free the memory allocated by AllocDebugMem
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// Check the link list, and the block to be freed.
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// Fill the block data with FREETAG before freed
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//
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// Arguments: void* pMem - Memory to be freed
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//
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// Returns: BOOL - TRUE for succeeded
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//
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// History: fengsun Created Header 4/2/98
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//
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//+----------------------------------------------------------------------------
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CMUTILAPI BOOL FreeDebugMem(void* pMem)
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{
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if (!fDebugMemInited)
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{
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StartDebugMemory();
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}
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if (!pMem)
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{
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return FALSE;
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}
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//
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// Get the lock
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//
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MemCriticalSection criticalSection;
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//
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// Get pointer to our structure
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//
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TMemoryBlock* pBlock =(TMemoryBlock*)( (char*)pMem - sizeof(TMemoryBlock));
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//
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// Check the block to be freed
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//
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if (!CheckBlock(pBlock))
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{
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return FALSE;
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}
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//
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// Check the link list
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//
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if (!RealCheckMemory())
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{
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return FALSE;
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}
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//
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// remove the block from the list
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//
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pBlock->pPrev->pNext = pBlock->pNext;
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if (pBlock->pNext)
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{
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pBlock->pNext->pPrev = pBlock->pPrev;
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}
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nTotalMem -= pBlock->size;
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nTotalBlock --;
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//
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// Fill the freed memory with 0xBD, leave the size/filename/lineNumber unchanged
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//
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memset(&pBlock->topTag, FREETAG, (size_t)pBlock->size + sizeof(pBlock->topTag) + TAGSIZE);
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return MemFree(pBlock);
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}
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//+----------------------------------------------------------------------------
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//
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// Function: void* ReAllocDebugMem
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//
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// Synopsis: Reallocate a memory with a diffirent size
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//
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// Arguments: void* pMem - memory to be reallocated
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// long nSize - size of the request
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// const char* lpFileName - FileName to be recorded
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// int nLine - Line umber to be recorded
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//
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// Returns: void* - new memory returned
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//
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// History: fengsun Created Header 4/2/98
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//
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//+----------------------------------------------------------------------------
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CMUTILAPI void* ReAllocDebugMem(void* pMem, long nSize, const char* lpFileName,int nLine)
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{
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if (!fDebugMemInited)
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{
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StartDebugMemory();
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}
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if (!pMem)
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{
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CMTRACE("Free a NULL pointer");
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return NULL;
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}
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//
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// Allocate a new block, copy the information over and free the old block.
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//
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TMemoryBlock* pBlock =(TMemoryBlock*)( (char*)pMem - sizeof(TMemoryBlock));
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long lOrginalSize = pBlock->size;
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void* pNew = AllocDebugMem(nSize, lpFileName, nLine);
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if(pNew)
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{
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CopyMemory(pNew, pMem, (nSize < lOrginalSize ? nSize : lOrginalSize));
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FreeDebugMem(pMem);
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}
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return pNew;
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}
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//+----------------------------------------------------------------------------
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//
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// Function: CheckDebugMem
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//
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// Synopsis: Exported to external module.
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// Call this function, whenever, you want to check against
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// memory curruption
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//
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// Arguments: None
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//
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// Returns: BOOL - TRUE if the memory is fine.
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//
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// History: fengsun Created Header 4/2/98
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//
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//+----------------------------------------------------------------------------
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CMUTILAPI BOOL CheckDebugMem()
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{
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if (!fDebugMemInited)
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{
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StartDebugMemory();
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}
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MemCriticalSection criticalSection;
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return RealCheckMemory();
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}
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//+----------------------------------------------------------------------------
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//
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// Function: RealCheckMemory
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//
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// Synopsis: Go through the link list to check for memory corruption
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//
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// Arguments: None
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//
|
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// Returns: BOOL - TRUE if the memory is fine.
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//
|
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// History: fengsun Created Header 4/2/98
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//
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//+----------------------------------------------------------------------------
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static BOOL RealCheckMemory()
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{
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TMemoryBlock* pBlock = head.pNext;
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int nBlock =0;
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while(pBlock!=NULL)
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{
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if(!CheckBlock(pBlock))
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{
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return FALSE;
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}
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pBlock = pBlock->pNext;
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nBlock++;
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}
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if(nBlock != nTotalBlock)
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{
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CMASSERTMSG(FALSE,"Memery corrupted");
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return FALSE;
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}
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return TRUE;
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}
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|
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//+----------------------------------------------------------------------------
|
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//
|
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// Function: CheckBlock
|
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//
|
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// Synopsis: Check a block for memory corruption
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//
|
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// Arguments: const TMemoryBlock* pBlock -
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//
|
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// Returns: BOOL - TRUE, if the block is fine
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//
|
|
// History: fengsun Created Header 4/2/98
|
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//
|
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//+----------------------------------------------------------------------------
|
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static BOOL CheckBlock(const TMemoryBlock* pBlock)
|
|
{
|
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if (pBlock->topTag != MEMTAG) // overwriten at top
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{
|
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CMASSERTMSG(FALSE, "Memery corrupted");
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return FALSE;
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}
|
|
|
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if (pBlock->size<0)
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{
|
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CMASSERTMSG(FALSE, "Memery corrupted");
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return FALSE;
|
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}
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|
|
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if (*(long*)(pBlock->pbData() +pBlock->size) != MEMTAG) // overwriten at bottom
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{
|
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CMASSERTMSG(FALSE, "Memery corrupted");
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return FALSE;
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}
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|
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if (pBlock->pPrev && pBlock->pPrev->pNext != pBlock)
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{
|
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CMASSERTMSG(FALSE, "Memery corrupted");
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return FALSE;
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}
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|
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if (pBlock->pNext && pBlock->pNext->pPrev != pBlock)
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{
|
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CMASSERTMSG(FALSE, "Memery corrupted");
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return FALSE;
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}
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|
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return TRUE;
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}
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|
|
|
/////////////////////////////////////////////////////////////////////////////
|
|
// operator new, delete
|
|
/* We did not redefine new and delete
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|
|
|
void* __cdecl operator new(size_t nSize)
|
|
{
|
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void* p = AllocDebugMem(nSize,NULL,0);
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|
|
|
if (p == NULL)
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{
|
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CMTRACE("New failed");
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}
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return p;
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}
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|
|
void* __cdecl operator new(size_t nSize, const char* lpszFileName, int nLine)
|
|
{
|
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void* p = AllocDebugMem(nSize, lpszFileName,nLine);
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|
|
if (p == NULL)
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{
|
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CMTRACE("New failed");
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}
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return p;
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}
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|
|
void __cdecl operator delete(void* p)
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{
|
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if(p)
|
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FreeDebugMem(p);
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}
|
|
*/
|
|
|
|
|
|
//+----------------------------------------------------------------------------
|
|
//
|
|
// Function: EndDebugMemory
|
|
//
|
|
// Synopsis: Called before the program exits. Report any unreleased memory leak
|
|
//
|
|
// Arguments: None
|
|
//
|
|
// Returns: Nothing
|
|
//
|
|
// History: fengsun Created Header 4/2/98
|
|
//
|
|
//+----------------------------------------------------------------------------
|
|
void EndDebugMemory()
|
|
{
|
|
if(head.pNext != NULL || nTotalMem!=0 || nTotalBlock !=0)
|
|
{
|
|
CMTRACE("Detected memory leaks");
|
|
TMemoryBlock * pBlock;
|
|
|
|
for(pBlock = head.pNext; pBlock != NULL; pBlock = pBlock->pNext)
|
|
{
|
|
TCHAR buf[1024];
|
|
wsprintf(buf, TEXT("Memory Leak of %d bytes:\n%S"), pBlock->size, pBlock->pbData());
|
|
MyDbgAssertA(pBlock->lpFileName, pBlock->nLine, buf); // do not print the file name
|
|
}
|
|
DeleteCriticalSection(&cSection);
|
|
}
|
|
}
|
|
|
|
#else // defined(DEBUG) && defined(DEBUG_MEM)
|
|
|
|
//////////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// If DEBUG_MEM if NOT defined, only track a count of memory for debug version
|
|
//
|
|
///////////////////////////////////////////////////////////////////////////////////
|
|
|
|
#ifdef DEBUG
|
|
|
|
void TraceHeapBlock(PROCESS_HEAP_ENTRY* pheEntry)
|
|
{
|
|
CMTRACE(TEXT("TraceHeapBlock -- Begin Entry Trace"));
|
|
|
|
CMTRACE1(TEXT("\tEntry->lpData = 0x%x"), pheEntry->lpData);
|
|
CMTRACE1(TEXT("\tEntry->cbData = %u"), pheEntry->cbData);
|
|
CMTRACE1(TEXT("\tEntry->cbOverhead = %u"), pheEntry->cbOverhead);
|
|
CMTRACE1(TEXT("\tEntry->iRegionIndex = %u"), pheEntry->iRegionIndex);
|
|
|
|
if (pheEntry->wFlags & PROCESS_HEAP_REGION)
|
|
{
|
|
CMTRACE1(TEXT("\tEntry->dwCommittedSize = %u"), pheEntry->Region.dwCommittedSize);
|
|
CMTRACE1(TEXT("\tEntry->dwUnCommittedSize = %u"), pheEntry->Region.dwUnCommittedSize);
|
|
CMTRACE1(TEXT("\tEntry->lpFirstBlock = 0x%x"), pheEntry->Region.lpFirstBlock);
|
|
CMTRACE1(TEXT("\tEntry->lpLastBlock = 0x%x"), pheEntry->Region.lpLastBlock);
|
|
CMTRACE(TEXT("\tPROCESS_HEAP_REGION flag set."));
|
|
}
|
|
|
|
if (pheEntry->wFlags & PROCESS_HEAP_UNCOMMITTED_RANGE)
|
|
{
|
|
CMTRACE(TEXT("\tPROCESS_HEAP_UNCOMMITTED_RANGE flag set."));
|
|
}
|
|
|
|
if ((pheEntry->wFlags & PROCESS_HEAP_ENTRY_BUSY) && (pheEntry->wFlags & PROCESS_HEAP_ENTRY_MOVEABLE))
|
|
{
|
|
CMTRACE1(TEXT("\tEntry->hMem = 0x%x"), pheEntry->Block.hMem);
|
|
CMTRACE1(TEXT("\tEntry->dwReserved = %u"), pheEntry->Block.dwReserved);
|
|
|
|
CMTRACE(TEXT("\tPROCESS_HEAP_ENTRY_BUSY and PROCESS_HEAP_ENTRY_MOVEABLE flags are set."));
|
|
}
|
|
|
|
if ((pheEntry->wFlags & PROCESS_HEAP_ENTRY_BUSY) && (pheEntry->wFlags & PROCESS_HEAP_ENTRY_DDESHARE))
|
|
{
|
|
CMTRACE(TEXT("\tPROCESS_HEAP_ENTRY_BUSY and PROCESS_HEAP_ENTRY_DDESHARE flags are set."));
|
|
}
|
|
|
|
CMTRACE(TEXT("TraceHeapBlock -- End Entry Trace"));
|
|
CMTRACE(TEXT(""));
|
|
}
|
|
|
|
BOOL CheckProcessHeap()
|
|
{
|
|
BOOL bRet;
|
|
DWORD dwError;
|
|
PROCESS_HEAP_ENTRY pheEntry;
|
|
|
|
ZeroMemory(&pheEntry, sizeof(pheEntry));
|
|
|
|
do
|
|
{
|
|
bRet = HeapWalk(g_hProcessHeap, &pheEntry);
|
|
if (!bRet)
|
|
{
|
|
dwError = GetLastError();
|
|
if (ERROR_NO_MORE_ITEMS != dwError)
|
|
{
|
|
CMTRACE1(TEXT("HeapWalk returned FALSE, GLE returns %u"), dwError);
|
|
}
|
|
else
|
|
{
|
|
TraceHeapBlock(&pheEntry);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
TraceHeapBlock(&pheEntry);
|
|
}
|
|
|
|
} while(!bRet);
|
|
|
|
return TRUE;
|
|
}
|
|
#endif // DEBUG
|
|
|
|
CMUTILAPI void *CmRealloc(void *pvPtr, size_t nBytes)
|
|
{
|
|
|
|
#ifdef DEBUG
|
|
if (OS_NT && !HeapValidate(g_hProcessHeap, 0, NULL))
|
|
{
|
|
CMTRACE(TEXT("CmRealloc -- HeapValidate Returns FALSE. Checking Process Heap."));
|
|
|
|
CheckProcessHeap();
|
|
}
|
|
#endif
|
|
|
|
void* p = HeapReAlloc(g_hProcessHeap, HEAP_ZERO_MEMORY, pvPtr, nBytes);
|
|
|
|
#ifdef DEBUG
|
|
if (OS_NT && !HeapValidate(g_hProcessHeap, 0, NULL))
|
|
{
|
|
CMTRACE(TEXT("CmRealloc -- HeapValidate Returns FALSE. Checking Process Heap."));
|
|
|
|
CheckProcessHeap();
|
|
}
|
|
|
|
CMASSERTMSG(p, TEXT("CmRealloc failed"));
|
|
#endif
|
|
|
|
return p;
|
|
}
|
|
|
|
|
|
CMUTILAPI void *CmMalloc(size_t nBytes)
|
|
{
|
|
|
|
#ifdef DEBUG
|
|
|
|
InterlockedIncrement(&g_lMallocCnt);
|
|
|
|
MYDBGASSERT(nBytes < 1024*1024); // It should be less than 1 MB
|
|
MYDBGASSERT(nBytes > 0); // It should be *something*
|
|
|
|
if (OS_NT && !HeapValidate(g_hProcessHeap, 0, NULL))
|
|
{
|
|
CMTRACE(TEXT("CmMalloc -- HeapValidate Returns FALSE. Checking Process Heap."));
|
|
|
|
CheckProcessHeap();
|
|
}
|
|
|
|
#endif
|
|
|
|
void* p = HeapAlloc(g_hProcessHeap, HEAP_ZERO_MEMORY, nBytes);
|
|
|
|
#ifdef DEBUG
|
|
|
|
if (OS_NT && !HeapValidate(g_hProcessHeap, 0, NULL))
|
|
{
|
|
CMTRACE(TEXT("CmMalloc -- HeapValidate Returns FALSE. Checking Process Heap."));
|
|
|
|
CheckProcessHeap();
|
|
}
|
|
|
|
CMASSERTMSG(p, TEXT("CmMalloc failed"));
|
|
|
|
#endif
|
|
|
|
return p;
|
|
}
|
|
|
|
|
|
CMUTILAPI void CmFree(void *pvPtr)
|
|
{
|
|
|
|
#ifdef DEBUG
|
|
if (OS_NT && !HeapValidate(g_hProcessHeap, 0, NULL))
|
|
{
|
|
CMTRACE(TEXT("CmMalloc -- HeapValidate Returns FALSE. Checking Process Heap."));
|
|
|
|
CheckProcessHeap();
|
|
}
|
|
#endif
|
|
|
|
if (pvPtr)
|
|
{
|
|
MYVERIFY(HeapFree(g_hProcessHeap, 0, pvPtr));
|
|
|
|
#ifdef DEBUG
|
|
|
|
if (OS_NT && !HeapValidate(g_hProcessHeap, 0, NULL))
|
|
{
|
|
CMTRACE(TEXT("CmMalloc -- HeapValidate Returns FALSE. Checking Process Heap."));
|
|
|
|
CheckProcessHeap();
|
|
}
|
|
|
|
InterlockedDecrement(&g_lMallocCnt);
|
|
#endif
|
|
|
|
}
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
void EndDebugMemory()
|
|
{
|
|
if (g_lMallocCnt)
|
|
{
|
|
char buf[256];
|
|
wsprintfA(buf, TEXT("Detect Memory Leak of %d blocks"), g_lMallocCnt);
|
|
CMASSERTMSGA(FALSE, buf);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
#endif
|
|
|
|
//
|
|
// the memory functions are for i386 only.
|
|
//
|
|
#ifdef _M_IX86
|
|
//+----------------------------------------------------------------------------
|
|
//
|
|
// memmove - Copy source buffer to destination buffer. The code is copied from
|
|
// libc.
|
|
//
|
|
// Purpose:
|
|
// memmove() copies a source memory buffer to a destination memory buffer.
|
|
// This routine recognize overlapping buffers to avoid propogation.
|
|
// For cases where propogation is not a problem, memcpy() can be used.
|
|
//
|
|
// Entry:
|
|
// void *dst = pointer to destination buffer
|
|
// const void *src = pointer to source buffer
|
|
// size_t count = number of bytes to copy
|
|
//
|
|
// Exit:
|
|
// Returns a pointer to the destination buffer
|
|
//
|
|
//+----------------------------------------------------------------------------
|
|
CMUTILAPI PVOID WINAPI CmMoveMemory(
|
|
PVOID dst,
|
|
CONST PVOID src,
|
|
size_t count
|
|
)
|
|
{
|
|
void * ret = dst;
|
|
PVOID src1 = src;
|
|
|
|
if (dst <= src1 || (char *)dst >= ((char *)src1 + count)) {
|
|
/*
|
|
* Non-Overlapping Buffers
|
|
* copy from lower addresses to higher addresses
|
|
*/
|
|
while (count--) {
|
|
*(char *)dst = *(char *)src1;
|
|
dst = (char *)dst + 1;
|
|
src1 = (char *)src1 + 1;
|
|
}
|
|
}
|
|
else {
|
|
/*
|
|
* Overlapping Buffers
|
|
* copy from higher addresses to lower addresses
|
|
*/
|
|
dst = (char *)dst + count - 1;
|
|
src1 = (char *)src1 + count - 1;
|
|
|
|
while (count--) {
|
|
*(char *)dst = *(char *)src1;
|
|
dst = (char *)dst - 1;
|
|
src1 = (char *)src1 - 1;
|
|
}
|
|
}
|
|
|
|
return(ret);
|
|
}
|
|
|
|
#endif //_M_IX86
|
|
|