293 lines
4.3 KiB
C
293 lines
4.3 KiB
C
/*++
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Copyright (c) 1997-2000 Microsoft Corporation
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Module Name:
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memory.c
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Abstract:
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Domain Name System (DNS) Library
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Memory allocation routines for DNS library.
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Author:
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Jim Gilroy (jamesg) January, 1997
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Revision History:
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--*/
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#include "local.h"
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//
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// Memory allocation
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//
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// Some DNS library functions -- including the IP array and string utils
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// -- allocate memory. This memory allocation defaults to routines that
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// use LocalAlloc, LocalReAlloc, LocalFree.
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//
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// Dns_Api.dll users can reset the memory allocation through
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// Dns_ApiHeapReset(), which saves pointers to remote allocation functions
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// which will override default allocators.
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//
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//
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// Allow overide of default memory allocation
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//
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DNSLIB_ALLOC_FUNCTION pDnsAllocFunction = NULL;
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DNSLIB_REALLOC_FUNCTION pDnsReallocFunction = NULL;
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DNSLIB_FREE_FUNCTION pDnsFreeFunction = NULL;
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VOID
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Dns_LibHeapReset(
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IN DNSLIB_ALLOC_FUNCTION pAlloc,
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IN DNSLIB_REALLOC_FUNCTION pRealloc,
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IN DNSLIB_FREE_FUNCTION pFree
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)
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/*++
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Routine Description:
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Resets heap routines used by dnsapi.dll routines.
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Arguments:
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pAlloc -- ptr to desired alloc function
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pRealloc -- ptr to desired realloc function
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pFree -- ptr to desired free function
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Return Value:
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None.
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--*/
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{
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pDnsAllocFunction = pAlloc;
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pDnsReallocFunction = pRealloc;
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pDnsFreeFunction = pFree;
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}
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//
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// Exported public memory routines.
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//
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// These use whatever the current memory allocation routines are, and
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// hence will always handle memory in the same fashion as dnsapi.dll
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// internal routines.
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//
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PVOID
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Dns_Alloc(
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IN INT iSize
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)
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/*++
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Routine Description:
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Allocates memory.
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Arguments:
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iSize - number of bytes to allocate
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Return Value:
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Pointer to memory allocated.
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NULL if allocation fails.
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--*/
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{
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if ( pDnsAllocFunction )
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{
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return (*pDnsAllocFunction)( iSize );
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}
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// default
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return LocalAlloc( LPTR, iSize );
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}
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PVOID
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Dns_Realloc(
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IN OUT PVOID pMem,
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IN INT iSize
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)
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/*++
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Routine Description:
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Reallocates memory
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Arguments:
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pMem - ptr to existing memory to reallocated
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iSize - number of bytes to reallocate
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Return Value:
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Pointer to memory allocated.
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NULL if allocation fails.
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--*/
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{
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if ( pDnsReallocFunction )
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{
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return (*pDnsReallocFunction)( pMem, iSize );
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}
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// default
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return LocalReAlloc( pMem, iSize, 0 );
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}
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VOID
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Dns_Free(
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IN OUT PVOID pMem
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)
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/*++
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Routine Description:
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Free memory
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Arguments:
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pMem - ptr to existing memory to reallocated
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Return Value:
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None
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--*/
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{
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if ( !pMem )
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{
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return;
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}
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if ( pDnsFreeFunction )
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{
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(*pDnsFreeFunction)( pMem );
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return;
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}
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// default
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LocalFree( pMem );
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}
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PVOID
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Dns_AllocZero(
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IN INT iSize
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)
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/*++
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Routine Description:
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Allocates and zeros memory.
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Arguments:
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iSize - number of bytes to allocate
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Return Value:
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Pointer to memory allocated.
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NULL if allocation fails.
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--*/
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{
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if ( pDnsAllocFunction )
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{
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PCHAR ptr;
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ptr = (*pDnsAllocFunction)( iSize );
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if ( !ptr )
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{
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return( NULL );
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}
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RtlZeroMemory( ptr, iSize );
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return( ptr );
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}
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// default
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return LocalAlloc( LPTR, iSize );
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}
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//
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// Helpful util
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//
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PVOID
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Dns_AllocMemCopy(
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IN PVOID pMem,
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IN INT Size
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)
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/*++
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Routine Description:
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Allocates and copies memory
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Arguments:
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pMem - memory to copy
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Size - number of bytes to allocate
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Return Value:
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Pointer to memory allocated.
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NULL if allocation fails.
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--*/
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{
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PBYTE ptr;
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ptr = Dns_Alloc( Size );
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if ( ptr )
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{
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if ( pMem )
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{
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RtlCopyMemory(
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ptr,
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pMem,
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Size );
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}
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else
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{
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RtlZeroMemory( ptr, Size );
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}
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}
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return ptr;
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}
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//
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// End of memory.c
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//
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