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/*++
Copyright (c) 1990,91 Microsoft Corporation
Module Name:
MidlUser.c
Abstract:
This file contains common functions and utilities that the API
DLLs can use in making remote calls. This includes the
MIDL_USER_ALLOCATE functions.
Author:
Dan Lafferty danl 06-Feb-1991
Environment:
User Mode - Win32
Revision History:
06-Feb-1991 danl
Created
25-Apr-1991 JohnRo
Split out MIDL user (allocate,free) into seperate source file, so
linker doesn't get confused.
03-July-1991 JimK
Moved to a common directory so services available to more than just
LM code.
03-Dec-1991 JohnRo
Added MIDL_user_reallocate and MIDL_user_size APIs. (These are so we
create the NetApiBufferAllocate, NetApiBufferReallocate, and
NetApiBufferSize APIs.)
Also check alignment of allocated data.
--*/
// These must be included first:
#include <nt.h>
#include <ntrtl.h> // needed for nturtl.h
#include <nturtl.h> // needed for windows.h
#include <windows.h> // win32 typedefs
#include <rpc.h> // rpc prototypes
// These may be included in any order:
#include <align.h> // POINTER_IS_ALIGNED(), ALIGN_WORST.
#include <ntrpcp.h> // MIDL_user_allocate(), MIDL_user_free().
#include <winbase.h> // LocalAlloc
#define LOCAL_ALLOCATION_FLAGS LMEM_ZEROINIT
PVOID
MIDL_user_allocate (
IN unsigned int NumBytes
)
/*++
Routine Description:
Allocates storage for RPC transactions. The RPC stubs will either call
MIDL_user_allocate when it needs to un-marshall data into a buffer
that the user must free. RPC servers will use MIDL_user_allocate to
allocate storage that the RPC server stub will free after marshalling
the data.
Arguments:
NumBytes - The number of bytes to allocate.
Return Value:
none
Note:
--*/
{
LPVOID NewPointer;
NewPointer = LocalAlloc(
LOCAL_ALLOCATION_FLAGS,
NumBytes);
ASSERT( POINTER_IS_ALIGNED( NewPointer, ALIGN_WORST) );
return (NewPointer);
} // MIDL_user_allocate
VOID
MIDL_user_free (
IN void *MemPointer
)
/*++
Routine Description:
Frees storage used in RPC transactions. The RPC client can call this
function to free buffer space that was allocated by the RPC client
stub when un-marshalling data that is to be returned to the client.
The Client calls MIDL_user_free when it is finished with the data and
desires to free up the storage.
The RPC server stub calls MIDL_user_free when it has completed
marshalling server data that is to be passed back to the client.
Arguments:
MemPointer - This points to the memory block that is to be released.
Return Value:
none.
Note:
--*/
{
ASSERT( POINTER_IS_ALIGNED( MemPointer, ALIGN_WORST) );
(void) LocalFree(MemPointer);
} // MIDL_user_free
void *
MIDL_user_reallocate(
IN void * OldPointer OPTIONAL,
IN unsigned long NewByteCount
)
{
LPVOID NewPointer; // may be NULL.
ASSERT( POINTER_IS_ALIGNED( OldPointer, ALIGN_WORST) );
// Special cases: something into nothing, or nothing into something.
if (OldPointer == NULL) {
NewPointer = LocalAlloc(
LOCAL_ALLOCATION_FLAGS,
NewByteCount);
} else if (NewByteCount == 0) {
(void) LocalFree( OldPointer );
NewPointer = NULL;
} else { // must be realloc of something to something else.
HANDLE hOldMem;
HANDLE hNewMem; // handle for new (may = old handle)
hOldMem = LocalHandle( (LPSTR) OldPointer);
ASSERT(hOldMem != NULL);
hNewMem = LocalReAlloc(
hOldMem, // old handle
NewByteCount, // new size in bytes
LOCAL_ALLOCATION_FLAGS | // flags
LMEM_MOVEABLE); // (motion okay)
if (hNewMem == NULL) {
// BUGBUG: call GetLastError, could be out of memory or error.
return (NULL);
}
NewPointer = (LPVOID) hNewMem;
} // must be realloc of something to something else
ASSERT( POINTER_IS_ALIGNED( NewPointer, ALIGN_WORST) );
return (NewPointer);
} // MIDL_user_reallocate
unsigned long
MIDL_user_size(
IN void * Pointer
)
{
DWORD ByteCount;
HANDLE hMemory;
ASSERT( Pointer != NULL );
ASSERT( POINTER_IS_ALIGNED( Pointer, ALIGN_WORST ) );
hMemory = LocalHandle( (LPSTR) Pointer );
ASSERT( hMemory != NULL );
ByteCount = LocalSize( hMemory );
ASSERT( ByteCount > 0 );
return (ByteCount);
} // MIDL_user_size
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