wine/dlls/winecrt0/delay_load.c

64 lines
2.2 KiB
C

/*
* Support for delayed imports
*
* Copyright 2005 Alexandre Julliard
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include <stdarg.h>
#include "windef.h"
#include "winbase.h"
struct ImgDelayDescr
{
DWORD_PTR grAttrs;
LPCSTR szName;
HMODULE *phmod;
IMAGE_THUNK_DATA *pIAT;
const IMAGE_THUNK_DATA *pINT;
const IMAGE_THUNK_DATA *pBoundIAT;
const IMAGE_THUNK_DATA *pUnloadIAT;
DWORD_PTR dwTimeStamp;
};
extern struct ImgDelayDescr __wine_spec_delay_imports[];
extern FARPROC WINAPI DelayLoadFailureHook( LPCSTR name, LPCSTR function );
FARPROC WINAPI DECLSPEC_HIDDEN __wine_spec_delay_load( unsigned int id )
{
struct ImgDelayDescr *descr = __wine_spec_delay_imports + HIWORD(id);
WORD func = LOWORD(id);
FARPROC proc;
if (!*descr->phmod) *descr->phmod = LoadLibraryA( descr->szName );
if (!*descr->phmod ||
!(proc = GetProcAddress( *descr->phmod, (LPCSTR)descr->pINT[func].u1.Function )))
proc = DelayLoadFailureHook( descr->szName, (LPCSTR)descr->pINT[func].u1.Function );
descr->pIAT[func].u1.Function = (ULONG_PTR)proc;
return proc;
}
#if defined(__GNUC__) && !defined(__APPLE__) /* we can't support destructors properly on Mac OS */
static void free_delay_imports(void) __attribute__((destructor));
static void free_delay_imports(void)
{
struct ImgDelayDescr *descr;
for (descr = __wine_spec_delay_imports; descr->szName; descr++)
if (*descr->phmod) FreeLibrary( *descr->phmod );
}
#endif