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wine/dlls/kernel/heap.c

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Moved most 32-bit heap functions to dlls/kernel.
2003-09-16 20:34:14 +00:00
/*
* Win32 heap functions
*
* Copyright 1995, 1996 Alexandre Julliard
* Copyright 1996 Huw Davies
* Copyright 1998 Ulrich Weigand
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "config.h"
#include <assert.h>
#include <stdlib.h>
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#include "windef.h"
#include "winbase.h"
#include "winerror.h"
#include "winnt.h"
#include "winreg.h"
#include "winternl.h"
#include "excpt.h"
#include "wine/exception.h"
#include "wine/debug.h"
WINE_DEFAULT_DEBUG_CHANNEL(heap);
/* address where we try to map the system heap */
#define SYSTEM_HEAP_BASE ((void*)0x65430000)
#define SYSTEM_HEAP_SIZE 0x100000 /* Default heap size = 1Mb */
static HANDLE systemHeap; /* globally shared heap */
/* filter for page-fault exceptions */
/* It is possible for a bogus global pointer to cause a */
/* page zero reference, so I include EXCEPTION_PRIV_INSTRUCTION too. */
static WINE_EXCEPTION_FILTER(page_fault)
{
switch (GetExceptionCode()) {
case (EXCEPTION_ACCESS_VIOLATION):
case (EXCEPTION_PRIV_INSTRUCTION):
return EXCEPTION_EXECUTE_HANDLER;
default:
return EXCEPTION_CONTINUE_SEARCH;
}
}
/***********************************************************************
* HEAP_CreateSystemHeap
*
* Create the system heap.
*/
inline static HANDLE HEAP_CreateSystemHeap(void)
{
int created;
void *base;
HANDLE map, event;
UNICODE_STRING event_name;
OBJECT_ATTRIBUTES event_attr;
if (!(map = CreateFileMappingA( INVALID_HANDLE_VALUE, NULL, SEC_COMMIT | PAGE_READWRITE,
0, SYSTEM_HEAP_SIZE, "__SystemHeap" ))) return 0;
created = (GetLastError() != ERROR_ALREADY_EXISTS);
if (!(base = MapViewOfFileEx( map, FILE_MAP_ALL_ACCESS, 0, 0, 0, SYSTEM_HEAP_BASE )))
{
/* pre-defined address not available */
ERR( "system heap base address %p not available\n", SYSTEM_HEAP_BASE );
return 0;
}
/* create the system heap event */
RtlCreateUnicodeStringFromAsciiz( &event_name, "__SystemHeapEvent" );
event_attr.Length = sizeof(event_attr);
event_attr.RootDirectory = 0;
event_attr.ObjectName = &event_name;
event_attr.Attributes = 0;
event_attr.SecurityDescriptor = NULL;
event_attr.SecurityQualityOfService = NULL;
NtCreateEvent( &event, EVENT_ALL_ACCESS, &event_attr, TRUE, FALSE );
if (created) /* newly created heap */
{
systemHeap = RtlCreateHeap( HEAP_SHARED, base, SYSTEM_HEAP_SIZE,
SYSTEM_HEAP_SIZE, NULL, NULL );
NtSetEvent( event, NULL );
}
else
{
/* wait for the heap to be initialized */
WaitForSingleObject( event, INFINITE );
systemHeap = (HANDLE)base;
}
CloseHandle( map );
return systemHeap;
}
/***********************************************************************
* HeapCreate (KERNEL32.@)
* RETURNS
* Handle of heap: Success
* NULL: Failure
*/
HANDLE WINAPI HeapCreate(
DWORD flags, /* [in] Heap allocation flag */
SIZE_T initialSize, /* [in] Initial heap size */
SIZE_T maxSize /* [in] Maximum heap size */
) {
HANDLE ret;
if ( flags & HEAP_SHARED )
{
if (!systemHeap) HEAP_CreateSystemHeap();
else WARN( "Shared Heap requested, returning system heap.\n" );
ret = systemHeap;
}
else
{
ret = RtlCreateHeap( flags, NULL, maxSize, initialSize, NULL, NULL );
if (!ret) SetLastError( ERROR_NOT_ENOUGH_MEMORY );
}
return ret;
}
/***********************************************************************
* HeapDestroy (KERNEL32.@)
* RETURNS
* TRUE: Success
* FALSE: Failure
*/
BOOL WINAPI HeapDestroy( HANDLE heap /* [in] Handle of heap */ )
{
if (heap == systemHeap)
{
WARN( "attempt to destroy system heap, returning TRUE!\n" );
return TRUE;
}
if (!RtlDestroyHeap( heap )) return TRUE;
SetLastError( ERROR_INVALID_HANDLE );
return FALSE;
}
/***********************************************************************
* HeapCompact (KERNEL32.@)
*/
SIZE_T WINAPI HeapCompact( HANDLE heap, DWORD flags )
{
return RtlCompactHeap( heap, flags );
}
/***********************************************************************
* HeapValidate (KERNEL32.@)
* Validates a specified heap.
*
* NOTES
* Flags is ignored.
*
* RETURNS
* TRUE: Success
* FALSE: Failure
*/
BOOL WINAPI HeapValidate(
HANDLE heap, /* [in] Handle to the heap */
DWORD flags, /* [in] Bit flags that control access during operation */
LPCVOID block /* [in] Optional pointer to memory block to validate */
) {
return RtlValidateHeap( heap, flags, block );
}
/***********************************************************************
* HeapWalk (KERNEL32.@)
* Enumerates the memory blocks in a specified heap.
*
* TODO
* - handling of PROCESS_HEAP_ENTRY_MOVEABLE and
* PROCESS_HEAP_ENTRY_DDESHARE (needs heap.c support)
*
* RETURNS
* TRUE: Success
* FALSE: Failure
*/
BOOL WINAPI HeapWalk(
HANDLE heap, /* [in] Handle to heap to enumerate */
LPPROCESS_HEAP_ENTRY entry /* [out] Pointer to structure of enumeration info */
) {
NTSTATUS ret = RtlWalkHeap( heap, entry );
if (ret) SetLastError( RtlNtStatusToDosError(ret) );
return !ret;
}
/***********************************************************************
* GetProcessHeaps (KERNEL32.@)
*/
DWORD WINAPI GetProcessHeaps( DWORD count, HANDLE *heaps )
{
return RtlGetProcessHeaps( count, heaps );
}
/*
* Win32 Global heap functions (GlobalXXX).
* These functions included in Win32 for compatibility with 16 bit Windows
* Especially the moveable blocks and handles are oldish.
* But the ability to directly allocate memory with GPTR and LPTR is widely
* used.
*
* The handle stuff looks horrible, but it's implemented almost like Win95
* does it.
*
*/
#define MAGIC_GLOBAL_USED 0x5342
#define GLOBAL_LOCK_MAX 0xFF
#define HANDLE_TO_INTERN(h) ((PGLOBAL32_INTERN)(((char *)(h))-2))
#define INTERN_TO_HANDLE(i) ((HGLOBAL) &((i)->Pointer))
#define POINTER_TO_HANDLE(p) (*(((HGLOBAL *)(p))-2))
#define ISHANDLE(h) (((ULONG_PTR)(h)&2)!=0)
#define ISPOINTER(h) (((ULONG_PTR)(h)&2)==0)
/* align the storage needed for the HGLOBAL on an 8byte boundary thus
* GlobalAlloc/GlobalReAlloc'ing with GMEM_MOVEABLE of memory with
* size = 8*k, where k=1,2,3,... alloc's exactly the given size.
* The Minolta DiMAGE Image Viewer heavily relies on this, corrupting
* the output jpeg's > 1 MB if not */
#define HGLOBAL_STORAGE 8 /* sizeof(HGLOBAL)*2 */
typedef struct __GLOBAL32_INTERN
{
WORD Magic;
LPVOID Pointer WINE_PACKED;
BYTE Flags;
BYTE LockCount;
} GLOBAL32_INTERN, *PGLOBAL32_INTERN;
/***********************************************************************
* GlobalAlloc (KERNEL32.@)
* RETURNS
* Handle: Success
* NULL: Failure
*/
HGLOBAL WINAPI GlobalAlloc(
UINT flags, /* [in] Object allocation attributes */
SIZE_T size /* [in] Number of bytes to allocate */
) {
PGLOBAL32_INTERN pintern;
DWORD hpflags;
LPVOID palloc;
if(flags&GMEM_ZEROINIT)
hpflags=HEAP_ZERO_MEMORY;
else
hpflags=0;
TRACE("() flags=%04x\n", flags );
if((flags & GMEM_MOVEABLE)==0) /* POINTER */
{
palloc=HeapAlloc(GetProcessHeap(), hpflags, size);
return (HGLOBAL) palloc;
}
else /* HANDLE */
{
RtlLockHeap(GetProcessHeap());
pintern = HeapAlloc(GetProcessHeap(), 0, sizeof(GLOBAL32_INTERN));
if (pintern)
{
pintern->Magic = MAGIC_GLOBAL_USED;
pintern->Flags = flags >> 8;
pintern->LockCount = 0;
if (size)
{
palloc = HeapAlloc(GetProcessHeap(), hpflags, size+HGLOBAL_STORAGE);
if (!palloc)
{
HeapFree(GetProcessHeap(), 0, pintern);
pintern = NULL;
}
else
{
*(HGLOBAL *)palloc = INTERN_TO_HANDLE(pintern);
pintern->Pointer = (char *)palloc + HGLOBAL_STORAGE;
}
}
else
pintern->Pointer = NULL;
}
RtlUnlockHeap(GetProcessHeap());
return pintern ? INTERN_TO_HANDLE(pintern) : 0;
}
}
/***********************************************************************
* GlobalLock (KERNEL32.@)
* RETURNS
* Pointer to first byte of block
* NULL: Failure
*/
LPVOID WINAPI GlobalLock(
HGLOBAL hmem /* [in] Handle of global memory object */
)
{
PGLOBAL32_INTERN pintern;
LPVOID palloc;
if (ISPOINTER(hmem))
return IsBadReadPtr(hmem, 1) ? NULL : hmem;
RtlLockHeap(GetProcessHeap());
__TRY
{
pintern = HANDLE_TO_INTERN(hmem);
if (pintern->Magic == MAGIC_GLOBAL_USED)
{
if (pintern->LockCount < GLOBAL_LOCK_MAX)
pintern->LockCount++;
palloc = pintern->Pointer;
}
else
{
WARN("invalid handle %p\n", hmem);
palloc = NULL;
SetLastError(ERROR_INVALID_HANDLE);
}
}
__EXCEPT(page_fault)
{
WARN("page fault on %p\n", hmem);
palloc = NULL;
SetLastError(ERROR_INVALID_HANDLE);
}
__ENDTRY
RtlUnlockHeap(GetProcessHeap());
return palloc;
}
/***********************************************************************
* GlobalUnlock (KERNEL32.@)
* RETURNS
* TRUE: Object is still locked
* FALSE: Object is unlocked
*/
BOOL WINAPI GlobalUnlock(
HGLOBAL hmem /* [in] Handle of global memory object */
) {
PGLOBAL32_INTERN pintern;
BOOL locked;
if (ISPOINTER(hmem)) return FALSE;
RtlLockHeap(GetProcessHeap());
__TRY
{
pintern=HANDLE_TO_INTERN(hmem);
if(pintern->Magic==MAGIC_GLOBAL_USED)
{
if((pintern->LockCount<GLOBAL_LOCK_MAX)&&(pintern->LockCount>0))
pintern->LockCount--;
locked = (pintern->LockCount != 0);
if (!locked) SetLastError(NO_ERROR);
}
else
{
WARN("invalid handle\n");
SetLastError(ERROR_INVALID_HANDLE);
locked=FALSE;
}
}
__EXCEPT(page_fault)
{
ERR("page fault occurred ! Caused by bug ?\n");
SetLastError( ERROR_INVALID_PARAMETER );
locked=FALSE;
}
__ENDTRY
RtlUnlockHeap(GetProcessHeap());
return locked;
}
/***********************************************************************
* GlobalHandle (KERNEL32.@)
* Returns the handle associated with the specified pointer.
*
* RETURNS
* Handle: Success
* NULL: Failure
*/
HGLOBAL WINAPI GlobalHandle(
LPCVOID pmem /* [in] Pointer to global memory block */
) {
HGLOBAL handle;
PGLOBAL32_INTERN maybe_intern;
LPCVOID test;
if (!pmem)
{
SetLastError( ERROR_INVALID_PARAMETER );
return 0;
}
RtlLockHeap(GetProcessHeap());
__TRY
{
handle = 0;
/* note that if pmem is a pointer to a a block allocated by */
/* GlobalAlloc with GMEM_MOVEABLE then magic test in HeapValidate */
/* will fail. */
if (ISPOINTER(pmem)) {
if (HeapValidate( GetProcessHeap(), 0, pmem )) {
handle = (HGLOBAL)pmem; /* valid fixed block */
break;
}
handle = POINTER_TO_HANDLE(pmem);
} else
handle = (HGLOBAL)pmem;
/* Now test handle either passed in or retrieved from pointer */
maybe_intern = HANDLE_TO_INTERN( handle );
if (maybe_intern->Magic == MAGIC_GLOBAL_USED) {
test = maybe_intern->Pointer;
if (HeapValidate( GetProcessHeap(), 0, (char *)test - HGLOBAL_STORAGE ) && /* obj(-handle) valid arena? */
HeapValidate( GetProcessHeap(), 0, maybe_intern )) /* intern valid arena? */
break; /* valid moveable block */
}
handle = 0;
SetLastError( ERROR_INVALID_HANDLE );
}
__EXCEPT(page_fault)
{
SetLastError( ERROR_INVALID_HANDLE );
handle = 0;
}
__ENDTRY
RtlUnlockHeap(GetProcessHeap());
return handle;
}
/***********************************************************************
* GlobalReAlloc (KERNEL32.@)
* RETURNS
* Handle: Success
* NULL: Failure
*/
HGLOBAL WINAPI GlobalReAlloc(
HGLOBAL hmem, /* [in] Handle of global memory object */
SIZE_T size, /* [in] New size of block */
UINT flags /* [in] How to reallocate object */
) {
LPVOID palloc;
HGLOBAL hnew;
PGLOBAL32_INTERN pintern;
DWORD heap_flags = (flags & GMEM_ZEROINIT) ? HEAP_ZERO_MEMORY : 0;
hnew = 0;
RtlLockHeap(GetProcessHeap());
if(flags & GMEM_MODIFY) /* modify flags */
{
if( ISPOINTER(hmem) && (flags & GMEM_MOVEABLE))
{
/* make a fixed block moveable
* actually only NT is able to do this. But it's soo simple
*/
if (hmem == 0)
{
WARN("GlobalReAlloc with null handle!\n");
SetLastError( ERROR_NOACCESS );
hnew = 0;
}
else
{
size = HeapSize(GetProcessHeap(), 0, (LPVOID)hmem);
hnew = GlobalAlloc(flags, size);
palloc = GlobalLock(hnew);
memcpy(palloc, (LPVOID)hmem, size);
GlobalUnlock(hnew);
GlobalFree(hmem);
}
}
else if( ISPOINTER(hmem) &&(flags & GMEM_DISCARDABLE))
{
/* change the flags to make our block "discardable" */
pintern=HANDLE_TO_INTERN(hmem);
pintern->Flags = pintern->Flags | (GMEM_DISCARDABLE >> 8);
hnew=hmem;
}
else
{
SetLastError(ERROR_INVALID_PARAMETER);
hnew = 0;
}
}
else
{
if(ISPOINTER(hmem))
{
/* reallocate fixed memory */
hnew=(HGLOBAL)HeapReAlloc(GetProcessHeap(), heap_flags, (LPVOID) hmem, size);
}
else
{
/* reallocate a moveable block */
pintern=HANDLE_TO_INTERN(hmem);
#if 0
/* Apparently Windows doesn't care whether the handle is locked at this point */
/* See also the same comment in GlobalFree() */
if(pintern->LockCount>1) {
ERR("handle 0x%08lx is still locked, cannot realloc!\n",(DWORD)hmem);
SetLastError(ERROR_INVALID_HANDLE);
} else
#endif
if(size!=0)
{
hnew=hmem;
if(pintern->Pointer)
{
if((palloc = HeapReAlloc(GetProcessHeap(), heap_flags,
(char *) pintern->Pointer-HGLOBAL_STORAGE,
size+HGLOBAL_STORAGE)) == NULL)
hnew = 0; /* Block still valid */
else
pintern->Pointer = (char *)palloc+HGLOBAL_STORAGE;
}
else
{
if((palloc=HeapAlloc(GetProcessHeap(), heap_flags, size+HGLOBAL_STORAGE))
== NULL)
hnew = 0;
else
{
*(HGLOBAL *)palloc = hmem;
pintern->Pointer = (char *)palloc + HGLOBAL_STORAGE;
}
}
}
else
{
if(pintern->Pointer)
{
HeapFree(GetProcessHeap(), 0, (char *) pintern->Pointer-HGLOBAL_STORAGE);
pintern->Pointer=NULL;
}
}
}
}
RtlUnlockHeap(GetProcessHeap());
return hnew;
}
/***********************************************************************
* GlobalFree (KERNEL32.@)
* RETURNS
* NULL: Success
* Handle: Failure
*/
HGLOBAL WINAPI GlobalFree(
HGLOBAL hmem /* [in] Handle of global memory object */
) {
PGLOBAL32_INTERN pintern;
HGLOBAL hreturned;
RtlLockHeap(GetProcessHeap());
__TRY
{
hreturned = 0;
if(ISPOINTER(hmem)) /* POINTER */
{
if(!HeapFree(GetProcessHeap(), 0, (LPVOID) hmem)) hmem = 0;
}
else /* HANDLE */
{
pintern=HANDLE_TO_INTERN(hmem);
if(pintern->Magic==MAGIC_GLOBAL_USED)
{
/* WIN98 does not make this test. That is you can free a */
/* block you have not unlocked. Go figure!! */
/* if(pintern->LockCount!=0) */
/* SetLastError(ERROR_INVALID_HANDLE); */
if(pintern->Pointer)
if(!HeapFree(GetProcessHeap(), 0, (char *)(pintern->Pointer)-HGLOBAL_STORAGE))
hreturned=hmem;
if(!HeapFree(GetProcessHeap(), 0, pintern))
hreturned=hmem;
}
}
}
__EXCEPT(page_fault)
{
ERR("page fault occurred ! Caused by bug ?\n");
SetLastError( ERROR_INVALID_PARAMETER );
hreturned = hmem;
}
__ENDTRY
RtlUnlockHeap(GetProcessHeap());
return hreturned;
}
/***********************************************************************
* GlobalSize (KERNEL32.@)
* RETURNS
* Size in bytes of the global memory object
* 0: Failure
*/
SIZE_T WINAPI GlobalSize(
HGLOBAL hmem /* [in] Handle of global memory object */
) {
DWORD retval;
PGLOBAL32_INTERN pintern;
if (!hmem) return 0;
if(ISPOINTER(hmem))
{
retval=HeapSize(GetProcessHeap(), 0, (LPVOID) hmem);
}
else
{
RtlLockHeap(GetProcessHeap());
pintern=HANDLE_TO_INTERN(hmem);
if(pintern->Magic==MAGIC_GLOBAL_USED)
{
if (!pintern->Pointer) /* handle case of GlobalAlloc( ??,0) */
retval = 0;
else
{
retval = HeapSize(GetProcessHeap(), 0,
(char *)(pintern->Pointer) - HGLOBAL_STORAGE );
if (retval != (DWORD)-1) retval -= HGLOBAL_STORAGE;
}
}
else
{
WARN("invalid handle\n");
retval=0;
}
RtlUnlockHeap(GetProcessHeap());
}
/* HeapSize returns 0xffffffff on failure */
if (retval == 0xffffffff) retval = 0;
return retval;
}
/***********************************************************************
* GlobalWire (KERNEL32.@)
*/
LPVOID WINAPI GlobalWire(HGLOBAL hmem)
{
return GlobalLock( hmem );
}
/***********************************************************************
* GlobalUnWire (KERNEL32.@)
*/
BOOL WINAPI GlobalUnWire(HGLOBAL hmem)
{
return GlobalUnlock( hmem);
}
/***********************************************************************
* GlobalFix (KERNEL32.@)
*/
VOID WINAPI GlobalFix(HGLOBAL hmem)
{
GlobalLock( hmem );
}
/***********************************************************************
* GlobalUnfix (KERNEL32.@)
*/
VOID WINAPI GlobalUnfix(HGLOBAL hmem)
{
GlobalUnlock( hmem);
}
/***********************************************************************
* GlobalFlags (KERNEL32.@)
* Returns information about the specified global memory object
*
* NOTES
* Should this return GMEM_INVALID_HANDLE on invalid handle?
*
* RETURNS
* Value specifying allocation flags and lock count
* GMEM_INVALID_HANDLE: Failure
*/
UINT WINAPI GlobalFlags(
HGLOBAL hmem /* [in] Handle to global memory object */
) {
DWORD retval;
PGLOBAL32_INTERN pintern;
if(ISPOINTER(hmem))
{
retval=0;
}
else
{
RtlLockHeap(GetProcessHeap());
pintern=HANDLE_TO_INTERN(hmem);
if(pintern->Magic==MAGIC_GLOBAL_USED)
{
retval=pintern->LockCount + (pintern->Flags<<8);
if(pintern->Pointer==0)
retval|= GMEM_DISCARDED;
}
else
{
WARN("Invalid handle: %p\n", hmem);
retval=0;
}
RtlUnlockHeap(GetProcessHeap());
}
return retval;
}
/***********************************************************************
* GlobalCompact (KERNEL32.@)
*/
SIZE_T WINAPI GlobalCompact( DWORD minfree )
{
return 0; /* GlobalCompact does nothing in Win32 */
}
/***********************************************************************
* LocalAlloc (KERNEL32.@)
* RETURNS
* Handle: Success
* NULL: Failure
*/
HLOCAL WINAPI LocalAlloc(
UINT flags, /* [in] Allocation attributes */
SIZE_T size /* [in] Number of bytes to allocate */
) {
return (HLOCAL)GlobalAlloc( flags, size );
}
/***********************************************************************
* LocalCompact (KERNEL32.@)
*/
SIZE_T WINAPI LocalCompact( UINT minfree )
{
return 0; /* LocalCompact does nothing in Win32 */
}
/***********************************************************************
* LocalFlags (KERNEL32.@)
* RETURNS
* Value specifying allocation flags and lock count.
* LMEM_INVALID_HANDLE: Failure
*/
UINT WINAPI LocalFlags(
HLOCAL handle /* [in] Handle of memory object */
) {
return GlobalFlags( (HGLOBAL)handle );
}
/***********************************************************************
* LocalFree (KERNEL32.@)
* RETURNS
* NULL: Success
* Handle: Failure
*/
HLOCAL WINAPI LocalFree(
HLOCAL handle /* [in] Handle of memory object */
) {
return (HLOCAL)GlobalFree( (HGLOBAL)handle );
}
/***********************************************************************
* LocalHandle (KERNEL32.@)
* RETURNS
* Handle: Success
* NULL: Failure
*/
HLOCAL WINAPI LocalHandle(
LPCVOID ptr /* [in] Address of local memory object */
) {
return (HLOCAL)GlobalHandle( ptr );
}
/***********************************************************************
* LocalLock (KERNEL32.@)
* Locks a local memory object and returns pointer to the first byte
* of the memory block.
*
* RETURNS
* Pointer: Success
* NULL: Failure
*/
LPVOID WINAPI LocalLock(
HLOCAL handle /* [in] Address of local memory object */
) {
return GlobalLock( (HGLOBAL)handle );
}
/***********************************************************************
* LocalReAlloc (KERNEL32.@)
* RETURNS
* Handle: Success
* NULL: Failure
*/
HLOCAL WINAPI LocalReAlloc(
HLOCAL handle, /* [in] Handle of memory object */
SIZE_T size, /* [in] New size of block */
UINT flags /* [in] How to reallocate object */
) {
return (HLOCAL)GlobalReAlloc( (HGLOBAL)handle, size, flags );
}
/***********************************************************************
* LocalShrink (KERNEL32.@)
*/
SIZE_T WINAPI LocalShrink( HGLOBAL handle, UINT newsize )
{
return 0; /* LocalShrink does nothing in Win32 */
}
/***********************************************************************
* LocalSize (KERNEL32.@)
* RETURNS
* Size: Success
* 0: Failure
*/
SIZE_T WINAPI LocalSize(
HLOCAL handle /* [in] Handle of memory object */
) {
return GlobalSize( (HGLOBAL)handle );
}
/***********************************************************************
* LocalUnlock (KERNEL32.@)
* RETURNS
* TRUE: Object is still locked
* FALSE: Object is unlocked
*/
BOOL WINAPI LocalUnlock(
HLOCAL handle /* [in] Handle of memory object */
) {
return GlobalUnlock( (HGLOBAL)handle );
}
/**********************************************************************
* AllocMappedBuffer (KERNEL32.38)
*
* This is a undocumented KERNEL32 function that
* SMapLS's a GlobalAlloc'ed buffer.
*
* Input: EDI register: size of buffer to allocate
* Output: EDI register: pointer to buffer
*
* Note: The buffer is preceded by 8 bytes:
* ...
* edi+0 buffer
* edi-4 SEGPTR to buffer
* edi-8 some magic Win95 needs for SUnMapLS
* (we use it for the memory handle)
*
* The SEGPTR is used by the caller!
*/
void WINAPI AllocMappedBuffer( CONTEXT86 *context )
{
HGLOBAL handle = GlobalAlloc(0, context->Edi + 8);
DWORD *buffer = (DWORD *)GlobalLock(handle);
DWORD ptr = 0;
if (buffer)
if (!(ptr = MapLS(buffer + 2)))
{
GlobalUnlock(handle);
GlobalFree(handle);
}
if (!ptr)
context->Eax = context->Edi = 0;
else
{
buffer[0] = (DWORD)handle;
buffer[1] = ptr;
context->Eax = (DWORD) ptr;
context->Edi = (DWORD)(buffer + 2);
}
}
/**********************************************************************
* FreeMappedBuffer (KERNEL32.39)
*
* Free a buffer allocated by AllocMappedBuffer
*
* Input: EDI register: pointer to buffer
*/
void WINAPI FreeMappedBuffer( CONTEXT86 *context )
{
if (context->Edi)
{
DWORD *buffer = (DWORD *)context->Edi - 2;
UnMapLS(buffer[1]);
GlobalUnlock((HGLOBAL)buffer[0]);
GlobalFree((HGLOBAL)buffer[0]);
}
}
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