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wine/dlls/krnl386.exe16/local.c
Alexandre Julliard 7a82d78b17 krnl386: Use nameless unions/structs.
2023-07-18 20:12:42 +02:00

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/*
* 16-bit local heap functions
*
* Copyright 1995 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
/*
* Note:
* All local heap functions need the current DS as first parameter
* when called from the emulation library, so they take one more
* parameter than usual.
*/
#include <stdlib.h>
#include <string.h>
#include "wine/winbase16.h"
#include "wownt32.h"
#include "winternl.h"
#include "kernel16_private.h"
#include "wine/debug.h"
WINE_DEFAULT_DEBUG_CHANNEL(local);
typedef struct
{
/* Arena header */
WORD prev; /* Previous arena | arena type */
WORD next; /* Next arena */
/* Start of the memory block or free-list info */
WORD size; /* Size of the free block */
WORD free_prev; /* Previous free block */
WORD free_next; /* Next free block */
} LOCALARENA;
#define ARENA_HEADER_SIZE 4
#define ARENA_HEADER( handle) ((handle) - ARENA_HEADER_SIZE)
/* Arena types (stored in 'prev' field of the arena) */
#define LOCAL_ARENA_FREE 0
#define LOCAL_ARENA_FIXED 1
/* LocalNotify() msgs */
#define LN_OUTOFMEM 0
#define LN_MOVE 1
#define LN_DISCARD 2
/* Layout of a handle entry table
*
* WORD count of entries
* LOCALHANDLEENTRY[count] entries
* WORD near ptr to next table
*/
typedef struct
{
WORD addr; /* Address of the MOVEABLE block */
BYTE flags; /* Flags for this block */
BYTE lock; /* Lock count */
} LOCALHANDLEENTRY;
/*
* We make addr = 4n + 2 and set *((WORD *)addr - 1) = &addr like Windows does
* in case something actually relies on this.
*
* An unused handle has lock = flags = 0xff. In windows addr is that of next
* free handle, at the moment in wine we set it to 0.
*
* A discarded block's handle has lock = addr = 0 and flags = 0x40
* (LMEM_DISCARDED >> 8)
*/
#define MOVEABLE_PREFIX sizeof(HLOCAL16)
#include "pshpack1.h"
typedef struct
{
WORD check; /* 00 Heap checking flag */
WORD freeze; /* 02 Heap frozen flag */
WORD items; /* 04 Count of items on the heap */
WORD first; /* 06 First item of the heap */
WORD pad1; /* 08 Always 0 */
WORD last; /* 0a Last item of the heap */
WORD pad2; /* 0c Always 0 */
BYTE ncompact; /* 0e Compactions counter */
BYTE dislevel; /* 0f Discard level */
DWORD distotal; /* 10 Total bytes discarded */
WORD htable; /* 14 Pointer to handle table */
WORD hfree; /* 16 Pointer to free handle table */
WORD hdelta; /* 18 Delta to expand the handle table */
WORD expand; /* 1a Pointer to expand function (unused) */
WORD pstat; /* 1c Pointer to status structure (unused) */
FARPROC16 notify; /* 1e Pointer to LocalNotify() function */
WORD lock; /* 22 Lock count for the heap */
WORD extra; /* 24 Extra bytes to allocate when expanding */
WORD minsize; /* 26 Minimum size of the heap */
WORD magic; /* 28 Magic number */
} LOCALHEAPINFO;
typedef struct
{
DWORD dwSize; /* 00 */
DWORD dwMemReserved; /* 04 */
DWORD dwMemCommitted; /* 08 */
DWORD dwTotalFree; /* 0C */
DWORD dwLargestFreeBlock; /* 10 */
DWORD dwcFreeHandles; /* 14 */
} LOCAL32INFO;
typedef struct
{
DWORD dwSize; /* 00 */
WORD hHandle; /* 04 */
DWORD dwAddress; /* 06 */
DWORD dwSizeBlock; /* 0A */
WORD wFlags; /* 0E */
WORD wType; /* 10 */
WORD hHeap; /* 12 */
WORD wHeapType; /* 14 */
DWORD dwNext; /* 16 */
DWORD dwNextAlt; /* 1A */
} LOCAL32ENTRY;
#include "poppack.h"
#define LOCAL_HEAP_MAGIC 0x484c /* 'LH' */
/* All local heap allocations are aligned on 4-byte boundaries */
#define LALIGN(word) (((word) + 3) & ~3)
#define ARENA_PTR(ptr,arena) ((LOCALARENA *)((char *)(ptr)+(arena)))
#define ARENA_PREV(ptr,arena) (ARENA_PTR((ptr),(arena))->prev & ~3)
#define ARENA_NEXT(ptr,arena) (ARENA_PTR((ptr),(arena))->next)
#define ARENA_FLAGS(ptr,arena) (ARENA_PTR((ptr),(arena))->prev & 3)
/* determine whether the handle belongs to a fixed or a moveable block */
#define HANDLE_FIXED(handle) (((handle) & 3) == 0)
#define HANDLE_MOVEABLE(handle) (((handle) & 3) == 2)
/* 32-bit heap definitions */
#define HTABLE_SIZE 0x10000
#define HTABLE_PAGESIZE 0x1000
#define HTABLE_NPAGES (HTABLE_SIZE / HTABLE_PAGESIZE)
#include "pshpack1.h"
typedef struct _LOCAL32HEADER
{
WORD freeListFirst[HTABLE_NPAGES];
WORD freeListSize[HTABLE_NPAGES];
WORD freeListLast[HTABLE_NPAGES];
DWORD selectorTableOffset;
WORD selectorTableSize;
WORD selectorDelta;
DWORD segment;
LPBYTE base;
DWORD limit;
DWORD flags;
DWORD magic;
HANDLE heap;
} LOCAL32HEADER;
#include "poppack.h"
#define LOCAL32_MAGIC ((DWORD)('L' | ('H'<<8) | ('3'<<16) | ('2'<<24)))
static inline BOOL16 call_notify_func( FARPROC16 proc, WORD msg, HLOCAL16 handle, WORD arg )
{
DWORD ret;
WORD args[3];
if (!proc) return FALSE;
args[2] = msg;
args[1] = handle;
args[0] = arg;
WOWCallback16Ex( (DWORD)proc, WCB16_PASCAL, sizeof(args), args, &ret );
return LOWORD(ret);
}
/***********************************************************************
* LOCAL_GetHeap
*
* Return a pointer to the local heap, making sure it exists.
*/
static LOCALHEAPINFO *LOCAL_GetHeap( HANDLE16 ds )
{
LOCALHEAPINFO *pInfo;
INSTANCEDATA *ptr = MapSL( MAKESEGPTR( ds, 0 ));
TRACE("Heap at %p, %04x\n", ptr, (ptr != NULL ? ptr->heap : 0xFFFF));
if (!ptr || !ptr->heap) return NULL;
if (IsBadReadPtr16( (SEGPTR)MAKELONG(ptr->heap,ds), sizeof(LOCALHEAPINFO)))
{
WARN("Bad pointer\n");
return NULL;
}
pInfo = (LOCALHEAPINFO*)((char*)ptr + ptr->heap);
if (pInfo->magic != LOCAL_HEAP_MAGIC)
{
WARN("Bad magic\n");
return NULL;
}
return pInfo;
}
/***********************************************************************
* LOCAL_MakeBlockFree
*
* Make a block free, inserting it in the free-list.
* 'block' is the handle of the block arena; 'baseptr' points to
* the beginning of the data segment containing the heap.
*/
static void LOCAL_MakeBlockFree( char *baseptr, WORD block )
{
LOCALARENA *pArena, *pNext;
WORD next;
/* Mark the block as free */
pArena = ARENA_PTR( baseptr, block );
pArena->prev = (pArena->prev & ~3) | LOCAL_ARENA_FREE;
pArena->size = pArena->next - block;
/* Find the next free block (last block is always free) */
next = pArena->next;
for (;;)
{
pNext = ARENA_PTR( baseptr, next );
if ((pNext->prev & 3) == LOCAL_ARENA_FREE) break;
next = pNext->next;
}
TRACE("%04x, next %04x\n", block, next );
/* Insert the free block in the free-list */
pArena->free_prev = pNext->free_prev;
pArena->free_next = next;
ARENA_PTR(baseptr,pNext->free_prev)->free_next = block;
pNext->free_prev = block;
}
/***********************************************************************
* LOCAL_RemoveFreeBlock
*
* Remove a block from the free-list.
* 'block' is the handle of the block arena; 'baseptr' points to
* the beginning of the data segment containing the heap.
*/
static void LOCAL_RemoveFreeBlock( char *baseptr, WORD block )
{
/* Mark the block as fixed */
LOCALARENA *pArena = ARENA_PTR( baseptr, block );
pArena->prev = (pArena->prev & ~3) | LOCAL_ARENA_FIXED;
/* Remove it from the list */
ARENA_PTR(baseptr,pArena->free_prev)->free_next = pArena->free_next;
ARENA_PTR(baseptr,pArena->free_next)->free_prev = pArena->free_prev;
}
/***********************************************************************
* LOCAL_AddBlock
*
* Insert a new block in the heap.
* 'new' is the handle of the new block arena; 'baseptr' points to
* the beginning of the data segment containing the heap; 'prev' is
* the block before the new one.
*/
static void LOCAL_AddBlock( char *baseptr, WORD prev, WORD new )
{
LOCALARENA *pPrev = ARENA_PTR( baseptr, prev );
LOCALARENA *pNew = ARENA_PTR( baseptr, new );
pNew->prev = (prev & ~3) | LOCAL_ARENA_FIXED;
pNew->next = pPrev->next;
ARENA_PTR(baseptr,pPrev->next)->prev &= 3;
ARENA_PTR(baseptr,pPrev->next)->prev |= new;
pPrev->next = new;
}
/***********************************************************************
* LOCAL_RemoveBlock
*
* Remove a block from the heap.
* 'block' is the handle of the block arena; 'baseptr' points to
* the beginning of the data segment containing the heap.
*/
static void LOCAL_RemoveBlock( char *baseptr, WORD block )
{
LOCALARENA *pArena, *pTmp;
/* Remove the block from the free-list */
TRACE("\n");
pArena = ARENA_PTR( baseptr, block );
if ((pArena->prev & 3) == LOCAL_ARENA_FREE)
LOCAL_RemoveFreeBlock( baseptr, block );
/* If the previous block is free, expand its size */
pTmp = ARENA_PTR( baseptr, pArena->prev & ~3 );
if ((pTmp->prev & 3) == LOCAL_ARENA_FREE)
pTmp->size += pArena->next - block;
/* Remove the block from the linked list */
pTmp->next = pArena->next;
pTmp = ARENA_PTR( baseptr, pArena->next );
pTmp->prev = (pTmp->prev & 3) | (pArena->prev & ~3);
}
/***********************************************************************
* LOCAL_PrintHeap
*/
static void LOCAL_PrintHeap( HANDLE16 ds )
{
char *ptr;
LOCALHEAPINFO *pInfo;
WORD arena;
/* FIXME - the test should be done when calling the function!
plus is not clear that we should print this info
only when TRACE_ON is on! */
if(!TRACE_ON(local)) return;
ptr = MapSL( MAKESEGPTR( ds, 0 ));
pInfo = LOCAL_GetHeap( ds );
if (!pInfo)
{
ERR( "Local Heap corrupted! ds=%04x\n", ds );
return;
}
TRACE( "Local Heap ds=%04x first=%04x last=%04x items=%d\n",
ds, pInfo->first, pInfo->last, pInfo->items );
arena = pInfo->first;
for (;;)
{
LOCALARENA *pArena = ARENA_PTR(ptr,arena);
TRACE( " %04x: prev=%04x next=%04x type=%d\n", arena,
pArena->prev & ~3, pArena->next, pArena->prev & 3 );
if (arena == pInfo->first)
{
TRACE( " size=%d free_prev=%04x free_next=%04x\n",
pArena->size, pArena->free_prev, pArena->free_next );
}
if ((pArena->prev & 3) == LOCAL_ARENA_FREE)
{
TRACE( " size=%d free_prev=%04x free_next=%04x\n",
pArena->size, pArena->free_prev, pArena->free_next );
if (pArena->next == arena) break; /* last one */
if (ARENA_PTR(ptr,pArena->free_next)->free_prev != arena)
{
TRACE( "*** arena->free_next->free_prev != arena\n" );
break;
}
}
if (pArena->next == arena)
{
TRACE( "*** last block is not marked free\n" );
break;
}
if ((ARENA_PTR(ptr,pArena->next)->prev & ~3) != arena)
{
TRACE( "*** arena->next->prev != arena (%04x, %04x)\n",
pArena->next, ARENA_PTR(ptr,pArena->next)->prev);
break;
}
arena = pArena->next;
}
}
/***********************************************************************
* LocalInit (KERNEL.4)
*/
BOOL16 WINAPI LocalInit16( HANDLE16 selector, WORD start, WORD end )
{
char *ptr;
WORD heapInfoArena, freeArena, lastArena;
LOCALHEAPINFO *pHeapInfo;
LOCALARENA *pArena, *pFirstArena, *pLastArena;
BOOL16 ret = FALSE;
/* The initial layout of the heap is: */
/* - first arena (FIXED) */
/* - heap info structure (FIXED) */
/* - large free block (FREE) */
/* - last arena (FREE) */
TRACE("%04x %04x-%04x\n", selector, start, end);
if (!selector) selector = CURRENT_DS;
if (TRACE_ON(local))
{
/* If TRACE_ON(local) is set, the global heap blocks are */
/* cleared before use, so we can test for double initialization. */
if (LOCAL_GetHeap(selector))
{
ERR("Heap %04x initialized twice.\n", selector);
LOCAL_PrintHeap(selector);
}
}
if (start == 0)
{
/* start == 0 means: put the local heap at the end of the segment */
DWORD size = GlobalSize16( GlobalHandle16( selector ) );
start = (WORD)(size > 0xffff ? 0xffff : size) - 1;
if ( end > 0xfffe ) end = 0xfffe;
start -= end;
end += start;
}
ptr = MapSL( MAKESEGPTR( selector, 0 ) );
start = LALIGN( max( start, sizeof(INSTANCEDATA) ) );
heapInfoArena = LALIGN(start + sizeof(LOCALARENA) );
freeArena = LALIGN( heapInfoArena + ARENA_HEADER_SIZE
+ sizeof(LOCALHEAPINFO) );
lastArena = (end - sizeof(LOCALARENA)) & ~3;
/* Make sure there's enough space. */
if (freeArena + sizeof(LOCALARENA) >= lastArena) goto done;
/* Initialise the first arena */
pFirstArena = ARENA_PTR( ptr, start );
pFirstArena->prev = start | LOCAL_ARENA_FIXED;
pFirstArena->next = heapInfoArena;
pFirstArena->size = LALIGN(sizeof(LOCALARENA));
pFirstArena->free_prev = start; /* this one */
pFirstArena->free_next = freeArena;
/* Initialise the arena of the heap info structure */
pArena = ARENA_PTR( ptr, heapInfoArena );
pArena->prev = start | LOCAL_ARENA_FIXED;
pArena->next = freeArena;
/* Initialise the heap info structure */
pHeapInfo = (LOCALHEAPINFO *) (ptr + heapInfoArena + ARENA_HEADER_SIZE );
memset( pHeapInfo, 0, sizeof(LOCALHEAPINFO) );
pHeapInfo->items = 4;
pHeapInfo->first = start;
pHeapInfo->last = lastArena;
pHeapInfo->htable = 0;
pHeapInfo->hdelta = 0x20;
pHeapInfo->extra = 0x200;
pHeapInfo->minsize = lastArena - freeArena;
pHeapInfo->magic = LOCAL_HEAP_MAGIC;
/* Initialise the large free block */
pArena = ARENA_PTR( ptr, freeArena );
pArena->prev = heapInfoArena | LOCAL_ARENA_FREE;
pArena->next = lastArena;
pArena->size = lastArena - freeArena;
pArena->free_prev = start;
pArena->free_next = lastArena;
/* Initialise the last block */
pLastArena = ARENA_PTR( ptr, lastArena );
pLastArena->prev = freeArena | LOCAL_ARENA_FREE;
pLastArena->next = lastArena; /* this one */
pLastArena->size = LALIGN(sizeof(LOCALARENA));
pLastArena->free_prev = freeArena;
pLastArena->free_next = lastArena; /* this one */
/* Store the local heap address in the instance data */
((INSTANCEDATA *)ptr)->heap = heapInfoArena + ARENA_HEADER_SIZE;
LOCAL_PrintHeap( selector );
ret = TRUE;
done:
CURRENT_STACK16->ecx = ret; /* must be returned in cx too */
return ret;
}
/***********************************************************************
* LOCAL_GrowHeap
*/
static BOOL16 LOCAL_GrowHeap( HANDLE16 ds )
{
HANDLE16 hseg;
LONG oldsize;
LONG end;
LOCALHEAPINFO *pHeapInfo;
WORD freeArena, lastArena;
LOCALARENA *pArena, *pLastArena;
char *ptr;
hseg = GlobalHandle16( ds );
/* maybe mem allocated by Virtual*() ? */
if (!hseg) return FALSE;
oldsize = GlobalSize16( hseg );
/* if nothing can be gained, return */
if (oldsize > 0xfff0) return FALSE;
hseg = GlobalReAlloc16( hseg, 0x10000, GMEM_FIXED );
ptr = MapSL( MAKESEGPTR( ds, 0 ) );
pHeapInfo = LOCAL_GetHeap( ds );
if (pHeapInfo == NULL) {
ERR("Heap not found\n" );
return FALSE;
}
end = GlobalSize16( hseg );
lastArena = (end - sizeof(LOCALARENA)) & ~3;
/* Update the HeapInfo */
pHeapInfo->items++;
freeArena = pHeapInfo->last;
pHeapInfo->last = lastArena;
pHeapInfo->minsize += end - oldsize;
/* grow the old last block */
pArena = ARENA_PTR( ptr, freeArena );
pArena->size = lastArena - freeArena;
pArena->next = lastArena;
pArena->free_next = lastArena;
/* Initialise the new last block */
pLastArena = ARENA_PTR( ptr, lastArena );
pLastArena->prev = freeArena | LOCAL_ARENA_FREE;
pLastArena->next = lastArena; /* this one */
pLastArena->size = LALIGN(sizeof(LOCALARENA));
pLastArena->free_prev = freeArena;
pLastArena->free_next = lastArena; /* this one */
/* If block before freeArena is also free then merge them */
if((ARENA_PTR(ptr, (pArena->prev & ~3))->prev & 3) == LOCAL_ARENA_FREE)
{
LOCAL_RemoveBlock(ptr, freeArena);
pHeapInfo->items--;
}
TRACE("Heap expanded\n" );
LOCAL_PrintHeap( ds );
return TRUE;
}
/***********************************************************************
* LOCAL_FreeArena
*/
static HLOCAL16 LOCAL_FreeArena( WORD ds, WORD arena )
{
char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
LOCALHEAPINFO *pInfo;
LOCALARENA *pArena, *pPrev;
TRACE("%04x ds=%04x\n", arena, ds );
if (!(pInfo = LOCAL_GetHeap( ds ))) return arena;
pArena = ARENA_PTR( ptr, arena );
if ((pArena->prev & 3) == LOCAL_ARENA_FREE)
{
/* shouldn't happen */
ERR("Trying to free block %04x twice!\n",
arena );
LOCAL_PrintHeap( ds );
return arena;
}
/* Check if we can merge with the previous block */
pPrev = ARENA_PTR( ptr, pArena->prev & ~3 );
if ((pPrev->prev & 3) == LOCAL_ARENA_FREE)
{
arena = pArena->prev & ~3;
pArena = pPrev;
LOCAL_RemoveBlock( ptr, pPrev->next );
pInfo->items--;
}
else /* Make a new free block */
{
LOCAL_MakeBlockFree( ptr, arena );
}
/* Check if we can merge with the next block */
if ((pArena->next == pArena->free_next) &&
(pArena->next != pInfo->last))
{
LOCAL_RemoveBlock( ptr, pArena->next );
pInfo->items--;
}
return 0;
}
/***********************************************************************
* LOCAL_ShrinkArena
*
* Shrink an arena by creating a free block at its end if possible.
* 'size' includes the arena header, and must be aligned.
*/
static void LOCAL_ShrinkArena( WORD ds, WORD arena, WORD size )
{
char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
LOCALARENA *pArena = ARENA_PTR( ptr, arena );
if (arena + size + LALIGN(sizeof(LOCALARENA)) < pArena->next)
{
LOCALHEAPINFO *pInfo = LOCAL_GetHeap( ds );
if (!pInfo) return;
LOCAL_AddBlock( ptr, arena, arena + size );
pInfo->items++;
LOCAL_FreeArena( ds, arena + size );
}
}
/***********************************************************************
* LOCAL_GrowArenaDownward
*
* Grow an arena downward by using the previous arena (must be free).
*/
static void LOCAL_GrowArenaDownward( WORD ds, WORD arena, WORD newsize )
{
char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
LOCALHEAPINFO *pInfo;
LOCALARENA *pArena = ARENA_PTR( ptr, arena );
WORD prevArena = pArena->prev & ~3;
LOCALARENA *pPrevArena = ARENA_PTR( ptr, prevArena );
WORD offset, size;
char *p;
if (!(pInfo = LOCAL_GetHeap( ds ))) return;
offset = pPrevArena->size;
size = pArena->next - arena - ARENA_HEADER_SIZE;
LOCAL_RemoveFreeBlock( ptr, prevArena );
LOCAL_RemoveBlock( ptr, arena );
pInfo->items--;
p = (char *)pPrevArena + ARENA_HEADER_SIZE;
while (offset < size)
{
memcpy( p, p + offset, offset );
p += offset;
size -= offset;
}
if (size) memcpy( p, p + offset, size );
LOCAL_ShrinkArena( ds, prevArena, newsize );
}
/***********************************************************************
* LOCAL_GrowArenaUpward
*
* Grow an arena upward by using the next arena (must be free and big
* enough). Newsize includes the arena header and must be aligned.
*/
static void LOCAL_GrowArenaUpward( WORD ds, WORD arena, WORD newsize )
{
char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
LOCALHEAPINFO *pInfo;
LOCALARENA *pArena = ARENA_PTR( ptr, arena );
WORD nextArena = pArena->next;
if (!(pInfo = LOCAL_GetHeap( ds ))) return;
LOCAL_RemoveBlock( ptr, nextArena );
pInfo->items--;
LOCAL_ShrinkArena( ds, arena, newsize );
}
/***********************************************************************
* LOCAL_GetFreeSpace
*/
static WORD LOCAL_GetFreeSpace(WORD ds, WORD countdiscard)
{
char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
LOCALHEAPINFO *pInfo;
LOCALARENA *pArena;
WORD arena;
WORD freespace = 0;
if (!(pInfo = LOCAL_GetHeap( ds )))
{
ERR("Local heap not found\n" );
LOCAL_PrintHeap(ds);
return 0;
}
arena = pInfo->first;
pArena = ARENA_PTR( ptr, arena );
while (arena != pArena->free_next)
{
arena = pArena->free_next;
pArena = ARENA_PTR( ptr, arena );
if (pArena->size >= freespace) freespace = pArena->size;
}
/* FIXME doesn't yet calculate space that would become free if everything
were discarded when countdiscard == 1 */
if (freespace < ARENA_HEADER_SIZE) freespace = 0;
else freespace -= ARENA_HEADER_SIZE;
return freespace;
}
/***********************************************************************
* LOCAL_Compact
*/
static UINT16 LOCAL_Compact( HANDLE16 ds, UINT16 minfree, UINT16 flags )
{
char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
LOCALHEAPINFO *pInfo;
LOCALARENA *pArena, *pMoveArena, *pFinalArena;
WORD arena, movearena, finalarena, table;
WORD count, movesize, size;
WORD freespace;
LOCALHANDLEENTRY *pEntry;
if (!(pInfo = LOCAL_GetHeap( ds )))
{
ERR("Local heap not found\n" );
LOCAL_PrintHeap(ds);
return 0;
}
TRACE("ds = %04x, minfree = %04x, flags = %04x\n",
ds, minfree, flags);
freespace = LOCAL_GetFreeSpace(ds, minfree ? 0 : 1);
if(freespace >= minfree || (flags & LMEM_NOCOMPACT))
{
TRACE("Returning %04x.\n", freespace);
return freespace;
}
TRACE("Compacting heap %04x.\n", ds);
table = pInfo->htable;
while(table)
{
pEntry = (LOCALHANDLEENTRY *)(ptr + table + sizeof(WORD));
for(count = *(WORD *)(ptr + table); count > 0; count--, pEntry++)
{
if((pEntry->lock == 0) && (pEntry->flags != (LMEM_DISCARDED >> 8)))
{
/* OK we can move this one if we want */
TRACE("handle %04x (block %04x) can be moved.\n",
(WORD)((char *)pEntry - ptr), pEntry->addr);
movearena = ARENA_HEADER(pEntry->addr - MOVEABLE_PREFIX);
pMoveArena = ARENA_PTR(ptr, movearena);
movesize = pMoveArena->next - movearena;
arena = pInfo->first;
pArena = ARENA_PTR(ptr, arena);
size = 0xffff;
finalarena = 0;
/* Try to find the smallest arena that will do, */
/* which is below us in memory */
for(;;)
{
arena = pArena->free_next;
pArena = ARENA_PTR(ptr, arena);
if(arena >= movearena)
break;
if(arena == pArena->free_next)
break;
if((pArena->size >= movesize) && (pArena->size < size))
{
size = pArena->size;
finalarena = arena;
}
}
if (finalarena) /* Actually got somewhere to move */
{
TRACE("Moving it to %04x.\n", finalarena);
pFinalArena = ARENA_PTR(ptr, finalarena);
size = pFinalArena->size;
LOCAL_RemoveFreeBlock(ptr, finalarena);
LOCAL_ShrinkArena( ds, finalarena, movesize );
/* Copy the arena to its new location */
memcpy((char *)pFinalArena + ARENA_HEADER_SIZE,
(char *)pMoveArena + ARENA_HEADER_SIZE,
movesize - ARENA_HEADER_SIZE );
/* Free the old location */
LOCAL_FreeArena(ds, movearena);
call_notify_func(pInfo->notify, LN_MOVE,
(WORD)((char *)pEntry - ptr), pEntry->addr);
/* Update handle table entry */
pEntry->addr = finalarena + ARENA_HEADER_SIZE + MOVEABLE_PREFIX;
}
else if((ARENA_PTR(ptr, pMoveArena->prev & ~3)->prev & 3)
== LOCAL_ARENA_FREE)
{
/* Previous arena is free (but < movesize) */
/* so we can 'slide' movearena down into it */
finalarena = pMoveArena->prev & ~3;
LOCAL_GrowArenaDownward( ds, movearena, movesize );
/* Update handle table entry */
pEntry->addr = finalarena + ARENA_HEADER_SIZE + MOVEABLE_PREFIX;
}
}
}
table = *(WORD *)pEntry;
}
freespace = LOCAL_GetFreeSpace(ds, minfree ? 0 : 1);
if(freespace >= minfree || (flags & LMEM_NODISCARD))
{
TRACE("Returning %04x.\n", freespace);
return freespace;
}
table = pInfo->htable;
while(table)
{
pEntry = (LOCALHANDLEENTRY *)(ptr + table + sizeof(WORD));
for(count = *(WORD *)(ptr + table); count > 0; count--, pEntry++)
{
if(pEntry->addr && pEntry->lock == 0 &&
(pEntry->flags & (LMEM_DISCARDABLE >> 8)))
{
TRACE("Discarding handle %04x (block %04x).\n",
(char *)pEntry - ptr, pEntry->addr);
LOCAL_FreeArena(ds, ARENA_HEADER(pEntry->addr - MOVEABLE_PREFIX));
call_notify_func(pInfo->notify, LN_DISCARD, (char *)pEntry - ptr, pEntry->flags);
pEntry->addr = 0;
pEntry->flags = (LMEM_DISCARDED >> 8);
}
}
table = *(WORD *)pEntry;
}
return LOCAL_Compact(ds, 0xffff, LMEM_NODISCARD);
}
/***********************************************************************
* LOCAL_FindFreeBlock
*/
static HLOCAL16 LOCAL_FindFreeBlock( HANDLE16 ds, WORD size )
{
char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
LOCALHEAPINFO *pInfo;
LOCALARENA *pArena;
WORD arena;
if (!(pInfo = LOCAL_GetHeap( ds )))
{
ERR("Local heap not found\n" );
LOCAL_PrintHeap(ds);
return 0;
}
arena = pInfo->first;
pArena = ARENA_PTR( ptr, arena );
for (;;) {
arena = pArena->free_next;
pArena = ARENA_PTR( ptr, arena );
if (arena == pArena->free_next) break;
if (pArena->size >= size) return arena;
}
TRACE("not enough space\n" );
LOCAL_PrintHeap(ds);
return 0;
}
/***********************************************************************
* get_heap_name
*/
static const char *get_heap_name( WORD ds )
{
HINSTANCE16 inst = LoadLibrary16( "GDI" );
if (ds == GlobalHandleToSel16( inst ))
{
FreeLibrary16( inst );
return "GDI";
}
FreeLibrary16( inst );
inst = LoadLibrary16( "USER" );
if (ds == GlobalHandleToSel16( inst ))
{
FreeLibrary16( inst );
return "USER";
}
FreeLibrary16( inst );
return "local";
}
/***********************************************************************
* LOCAL_GetBlock
* The segment may get moved around in this function, so all callers
* should reset their pointer variables.
*/
static HLOCAL16 LOCAL_GetBlock( HANDLE16 ds, WORD size, WORD flags )
{
char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
LOCALHEAPINFO *pInfo;
LOCALARENA *pArena;
WORD arena;
if (!(pInfo = LOCAL_GetHeap( ds )))
{
ERR("Local heap not found\n");
LOCAL_PrintHeap(ds);
return 0;
}
size += ARENA_HEADER_SIZE;
size = LALIGN( max( size, sizeof(LOCALARENA) ) );
#if 0
notify_done:
#endif
/* Find a suitable free block */
arena = LOCAL_FindFreeBlock( ds, size );
if (arena == 0) {
/* no space: try to make some */
LOCAL_Compact( ds, size, flags );
arena = LOCAL_FindFreeBlock( ds, size );
}
if (arena == 0) {
/* still no space: try to grow the segment */
if (!(LOCAL_GrowHeap( ds )))
{
#if 0
/* FIXME: doesn't work correctly yet */
if (call_notify_func(pInfo->notify, LN_OUTOFMEM, ds - 20, size)) /* FIXME: "size" correct ? (should indicate bytes needed) */
goto notify_done;
#endif
ERR( "not enough space in %s heap %04x for %d bytes\n",
get_heap_name(ds), ds, size );
return 0;
}
ptr = MapSL( MAKESEGPTR( ds, 0 ) );
pInfo = LOCAL_GetHeap( ds );
arena = LOCAL_FindFreeBlock( ds, size );
}
if (arena == 0) {
ERR( "not enough space in %s heap %04x for %d bytes\n",
get_heap_name(ds), ds, size );
#if 0
/* FIXME: "size" correct ? (should indicate bytes needed) */
if (call_notify_func(pInfo->notify, LN_OUTOFMEM, ds, size)) goto notify_done;
#endif
return 0;
}
/* Make a block out of the free arena */
pArena = ARENA_PTR( ptr, arena );
TRACE("size = %04x, arena %04x size %04x\n", size, arena, pArena->size );
LOCAL_RemoveFreeBlock( ptr, arena );
LOCAL_ShrinkArena( ds, arena, size );
if (flags & LMEM_ZEROINIT)
memset((char *)pArena + ARENA_HEADER_SIZE, 0, size-ARENA_HEADER_SIZE);
return arena + ARENA_HEADER_SIZE;
}
/***********************************************************************
* LOCAL_NewHTable
*/
static BOOL16 LOCAL_NewHTable( HANDLE16 ds )
{
char *ptr;
LOCALHEAPINFO *pInfo;
LOCALHANDLEENTRY *pEntry;
HLOCAL16 handle;
int i;
TRACE("\n" );
if (!(pInfo = LOCAL_GetHeap( ds )))
{
ERR("Local heap not found\n");
LOCAL_PrintHeap(ds);
return FALSE;
}
if (!(handle = LOCAL_GetBlock( ds, pInfo->hdelta * sizeof(LOCALHANDLEENTRY)
+ 2 * sizeof(WORD), LMEM_FIXED )))
return FALSE;
if (!(ptr = MapSL( MAKESEGPTR( ds, 0 ) )))
ERR("ptr == NULL after GetBlock.\n");
if (!(pInfo = LOCAL_GetHeap( ds )))
ERR("pInfo == NULL after GetBlock.\n");
/* Fill the entry table */
*(WORD *)(ptr + handle) = pInfo->hdelta;
pEntry = (LOCALHANDLEENTRY *)(ptr + handle + sizeof(WORD));
for (i = pInfo->hdelta; i > 0; i--, pEntry++) {
pEntry->lock = pEntry->flags = 0xff;
pEntry->addr = 0;
}
*(WORD *)pEntry = pInfo->htable;
pInfo->htable = handle;
return TRUE;
}
/***********************************************************************
* LOCAL_GetNewHandleEntry
*/
static HLOCAL16 LOCAL_GetNewHandleEntry( HANDLE16 ds )
{
char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
LOCALHEAPINFO *pInfo;
LOCALHANDLEENTRY *pEntry = NULL;
WORD table;
if (!(pInfo = LOCAL_GetHeap( ds )))
{
ERR("Local heap not found\n");
LOCAL_PrintHeap(ds);
return 0;
}
/* Find a free slot in existing tables */
table = pInfo->htable;
while (table)
{
WORD count = *(WORD *)(ptr + table);
pEntry = (LOCALHANDLEENTRY *)(ptr + table + sizeof(WORD));
for (; count > 0; count--, pEntry++)
if (pEntry->lock == 0xff) break;
if (count) break;
table = *(WORD *)pEntry;
}
if (!table) /* We need to create a new table */
{
if (!LOCAL_NewHTable( ds )) return 0;
ptr = MapSL( MAKESEGPTR( ds, 0 ) );
pInfo = LOCAL_GetHeap( ds );
pEntry = (LOCALHANDLEENTRY *)(ptr + pInfo->htable + sizeof(WORD));
}
/* Now allocate this entry */
pEntry->lock = 0;
pEntry->flags = 0;
TRACE("(%04x): %04x\n", ds, ((char *)pEntry - ptr) );
return (HLOCAL16)((char *)pEntry - ptr);
}
/***********************************************************************
* LOCAL_FreeHandleEntry
*
* Free a handle table entry.
*/
static void LOCAL_FreeHandleEntry( HANDLE16 ds, HLOCAL16 handle )
{
char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
LOCALHANDLEENTRY *pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
LOCALHEAPINFO *pInfo;
WORD *pTable;
WORD table, count, i;
if (!(pInfo = LOCAL_GetHeap( ds ))) return;
/* Find the table where this handle comes from */
pTable = &pInfo->htable;
while (*pTable)
{
WORD size = (*(WORD *)(ptr + *pTable)) * sizeof(LOCALHANDLEENTRY);
if ((handle >= *pTable + sizeof(WORD)) &&
(handle < *pTable + sizeof(WORD) + size)) break; /* Found it */
pTable = (WORD *)(ptr + *pTable + sizeof(WORD) + size);
}
if (!*pTable)
{
ERR("Invalid entry %04x\n", handle);
LOCAL_PrintHeap( ds );
return;
}
/* Make the entry free */
pEntry->addr = 0; /* just in case */
pEntry->lock = 0xff;
pEntry->flags = 0xff;
/* Now check if all entries in this table are free */
table = *pTable;
pEntry = (LOCALHANDLEENTRY *)(ptr + table + sizeof(WORD));
count = *(WORD *)(ptr + table);
for (i = count; i > 0; i--, pEntry++) if (pEntry->lock != 0xff) return;
/* Remove the table from the linked list and free it */
TRACE("(%04x): freeing table %04x\n", ds, table);
*pTable = *(WORD *)pEntry;
LOCAL_FreeArena( ds, ARENA_HEADER( table ) );
}
/***********************************************************************
* LocalFree (KERNEL.7)
*/
HLOCAL16 WINAPI LocalFree16( HLOCAL16 handle )
{
HANDLE16 ds = CURRENT_DS;
char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
TRACE("%04x ds=%04x\n", handle, ds );
if (!handle) { WARN("Handle is 0.\n" ); return 0; }
if (HANDLE_FIXED( handle ))
{
if (!LOCAL_FreeArena( ds, ARENA_HEADER( handle ) )) return 0; /* OK */
else return handle; /* couldn't free it */
}
else
{
LOCALHANDLEENTRY *pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
if (pEntry->flags != (LMEM_DISCARDED >> 8))
{
TRACE("real block at %04x\n", pEntry->addr );
if (LOCAL_FreeArena( ds, ARENA_HEADER(pEntry->addr - MOVEABLE_PREFIX) ))
return handle; /* couldn't free it */
}
LOCAL_FreeHandleEntry( ds, handle );
return 0; /* OK */
}
}
/***********************************************************************
* LocalAlloc (KERNEL.5)
*/
HLOCAL16 WINAPI LocalAlloc16( UINT16 flags, WORD size )
{
HANDLE16 ds = CURRENT_DS;
HLOCAL16 handle = 0;
char *ptr;
TRACE("%04x %d ds=%04x\n", flags, size, ds );
if(size > 0 && size <= 4) size = 5;
if (flags & LMEM_MOVEABLE)
{
LOCALHANDLEENTRY *plhe;
HLOCAL16 hmem;
if(size)
{
if (!(hmem = LOCAL_GetBlock( ds, size + MOVEABLE_PREFIX, flags )))
goto exit;
}
else /* We just need to allocate a discarded handle */
hmem = 0;
if (!(handle = LOCAL_GetNewHandleEntry( ds )))
{
WARN("Couldn't get handle.\n");
if(hmem)
LOCAL_FreeArena( ds, ARENA_HEADER(hmem) );
goto exit;
}
ptr = MapSL( MAKESEGPTR( ds, 0 ) );
plhe = (LOCALHANDLEENTRY *)(ptr + handle);
plhe->lock = 0;
if(hmem)
{
plhe->addr = hmem + MOVEABLE_PREFIX;
plhe->flags = (BYTE)((flags & 0x0f00) >> 8);
*(HLOCAL16 *)(ptr + hmem) = handle;
}
else
{
plhe->addr = 0;
plhe->flags = LMEM_DISCARDED >> 8;
}
}
else /* FIXED */
{
if(size) handle = LOCAL_GetBlock( ds, size, flags );
}
exit:
CURRENT_STACK16->ecx = handle; /* must be returned in cx too */
return handle;
}
/***********************************************************************
* LocalReAlloc (KERNEL.6)
*/
HLOCAL16 WINAPI LocalReAlloc16( HLOCAL16 handle, WORD size, UINT16 flags )
{
HANDLE16 ds = CURRENT_DS;
char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
LOCALHEAPINFO *pInfo;
LOCALARENA *pArena, *pNext;
LOCALHANDLEENTRY *pEntry = NULL;
WORD arena, oldsize;
HLOCAL16 hmem, blockhandle;
LONG nextarena;
if (!handle) return 0;
if(HANDLE_MOVEABLE(handle) &&
((LOCALHANDLEENTRY *)(ptr + handle))->lock == 0xff) /* An unused handle */
return 0;
TRACE("%04x %d %04x ds=%04x\n", handle, size, flags, ds );
if (!(pInfo = LOCAL_GetHeap( ds ))) return 0;
if (HANDLE_FIXED( handle ))
blockhandle = handle;
else
{
pEntry = (LOCALHANDLEENTRY *) (ptr + handle);
if(pEntry->flags == (LMEM_DISCARDED >> 8))
{
HLOCAL16 hl;
if(pEntry->addr)
WARN("Dicarded block has non-zero addr.\n");
TRACE("ReAllocating discarded block\n");
if(size <= 4) size = 5;
if (!(hl = LOCAL_GetBlock( ds, size + MOVEABLE_PREFIX, flags)))
return 0;
ptr = MapSL( MAKESEGPTR( ds, 0 ) ); /* Reload ptr */
pEntry = (LOCALHANDLEENTRY *) (ptr + handle);
pEntry->addr = hl + MOVEABLE_PREFIX;
pEntry->flags = 0;
pEntry->lock = 0;
*(HLOCAL16 *)(ptr + hl) = handle;
return handle;
}
if (((blockhandle = pEntry->addr - MOVEABLE_PREFIX) & 3) != 0)
{
ERR("(%04x,%04x): invalid handle\n",
ds, handle );
return 0;
}
if (*(HLOCAL16 *)(ptr + blockhandle) != handle) {
ERR("Back ptr to handle is invalid\n");
return 0;
}
}
if (flags & LMEM_MODIFY)
{
if (HANDLE_MOVEABLE(handle))
{
pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
pEntry->flags = (flags & 0x0f00) >> 8;
TRACE("Changing flags to %x.\n", pEntry->flags);
}
return handle;
}
if (!size)
{
if (flags & LMEM_MOVEABLE)
{
if (HANDLE_FIXED(handle))
{
TRACE("Freeing fixed block.\n");
return LocalFree16( handle );
}
else /* Moveable block */
{
pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
if (pEntry->lock == 0)
{
/* discards moveable blocks */
TRACE("Discarding block\n");
LOCAL_FreeArena(ds, ARENA_HEADER(pEntry->addr - MOVEABLE_PREFIX));
pEntry->addr = 0;
pEntry->flags = (LMEM_DISCARDED >> 8);
return handle;
}
}
return 0;
}
else if(flags == 0)
{
pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
if (pEntry->lock == 0)
{
/* Frees block */
return LocalFree16( handle );
}
}
return 0;
}
arena = ARENA_HEADER( blockhandle );
TRACE("arena is %04x\n", arena );
pArena = ARENA_PTR( ptr, arena );
if(size <= 4) size = 5;
if(HANDLE_MOVEABLE(handle)) size += MOVEABLE_PREFIX;
oldsize = pArena->next - arena - ARENA_HEADER_SIZE;
nextarena = LALIGN(blockhandle + size);
/* Check for size reduction */
if (nextarena <= pArena->next)
{
TRACE("size reduction, making new free block\n");
LOCAL_ShrinkArena(ds, arena, nextarena - arena);
TRACE("returning %04x\n", handle );
return handle;
}
/* Check if the next block is free and large enough */
pNext = ARENA_PTR( ptr, pArena->next );
if (((pNext->prev & 3) == LOCAL_ARENA_FREE) &&
(nextarena <= pNext->next))
{
TRACE("size increase, making new free block\n");
LOCAL_GrowArenaUpward(ds, arena, nextarena - arena);
if (flags & LMEM_ZEROINIT)
{
char *oldend = (char *)pArena + ARENA_HEADER_SIZE + oldsize;
char *newend = ptr + pArena->next;
TRACE("Clearing memory from %p to %p (DS -> %p)\n", oldend, newend, ptr);
memset(oldend, 0, newend - oldend);
}
TRACE("returning %04x\n", handle );
return handle;
}
/* Now we have to allocate a new block, but not if (fixed block or locked
block) and no LMEM_MOVEABLE */
if (!(flags & LMEM_MOVEABLE))
{
if (HANDLE_FIXED(handle))
{
ERR("Needed to move fixed block, but LMEM_MOVEABLE not specified.\n");
return 0;
}
else
{
if(((LOCALHANDLEENTRY *)(ptr + handle))->lock != 0)
{
ERR("Needed to move locked block, but LMEM_MOVEABLE not specified.\n");
return 0;
}
}
}
hmem = LOCAL_GetBlock( ds, size, flags );
ptr = MapSL( MAKESEGPTR( ds, 0 )); /* Reload ptr */
if(HANDLE_MOVEABLE(handle)) /* LOCAL_GetBlock might have triggered */
{ /* a compaction, which might in turn have */
blockhandle = pEntry->addr - MOVEABLE_PREFIX; /* moved the very block we are resizing */
arena = ARENA_HEADER( blockhandle ); /* thus, we reload arena, too */
}
if (!hmem)
{
/* Remove the block from the heap and try again */
LPSTR buffer = HeapAlloc( GetProcessHeap(), 0, oldsize );
if (!buffer) return 0;
memcpy( buffer, ptr + arena + ARENA_HEADER_SIZE, oldsize );
LOCAL_FreeArena( ds, arena );
if (!(hmem = LOCAL_GetBlock( ds, size, flags )))
{
if (!(hmem = LOCAL_GetBlock( ds, oldsize, flags )))
{
ERR("Can't restore saved block\n" );
HeapFree( GetProcessHeap(), 0, buffer );
return 0;
}
size = oldsize;
}
ptr = MapSL( MAKESEGPTR( ds, 0 ) ); /* Reload ptr */
memcpy( ptr + hmem, buffer, oldsize );
HeapFree( GetProcessHeap(), 0, buffer );
}
else
{
memcpy( ptr + hmem, ptr + (arena + ARENA_HEADER_SIZE), oldsize );
LOCAL_FreeArena( ds, arena );
}
if (HANDLE_MOVEABLE( handle ))
{
TRACE("fixing handle\n");
pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
pEntry->addr = hmem + MOVEABLE_PREFIX;
/* Back ptr should still be correct */
if(*(HLOCAL16 *)(ptr + hmem) != handle)
ERR("back ptr is invalid.\n");
hmem = handle;
}
if (size == oldsize) hmem = 0; /* Realloc failed */
TRACE("returning %04x\n", hmem );
return hmem;
}
/***********************************************************************
* LOCAL_InternalLock
*/
static HLOCAL16 LOCAL_InternalLock( LPSTR heap, HLOCAL16 handle )
{
HLOCAL16 old_handle = handle;
if (HANDLE_MOVEABLE(handle))
{
LOCALHANDLEENTRY *pEntry = (LOCALHANDLEENTRY *)(heap + handle);
if (pEntry->flags == (LMEM_DISCARDED >> 8)) return 0;
if (pEntry->lock < 0xfe) pEntry->lock++;
handle = pEntry->addr;
}
TRACE("%04x returning %04x\n", old_handle, handle );
return handle;
}
/***********************************************************************
* LocalUnlock (KERNEL.9)
*/
BOOL16 WINAPI LocalUnlock16( HLOCAL16 handle )
{
HANDLE16 ds = CURRENT_DS;
char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
TRACE("%04x\n", handle );
if (HANDLE_MOVEABLE(handle))
{
LOCALHANDLEENTRY *pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
if (!pEntry->lock || (pEntry->lock == 0xff)) return FALSE;
/* For moveable block, return the new lock count */
/* (see _Windows_Internals_ p. 197) */
return --pEntry->lock;
}
else return FALSE;
}
/***********************************************************************
* LocalSize (KERNEL.10)
*/
UINT16 WINAPI LocalSize16( HLOCAL16 handle )
{
HANDLE16 ds = CURRENT_DS;
char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
LOCALARENA *pArena;
TRACE("%04x ds=%04x\n", handle, ds );
if (!handle) return 0;
if (HANDLE_MOVEABLE( handle ))
{
handle = *(WORD *)(ptr + handle);
if (!handle) return 0;
pArena = ARENA_PTR( ptr, ARENA_HEADER(handle - MOVEABLE_PREFIX) );
}
else
pArena = ARENA_PTR( ptr, ARENA_HEADER(handle) );
return pArena->next - handle;
}
/***********************************************************************
* LocalFlags (KERNEL.12)
*/
UINT16 WINAPI LocalFlags16( HLOCAL16 handle )
{
HANDLE16 ds = CURRENT_DS;
char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
if (HANDLE_MOVEABLE(handle))
{
LOCALHANDLEENTRY *pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
TRACE("(%04x,%04x): returning %04x\n",
ds, handle, pEntry->lock | (pEntry->flags << 8) );
return pEntry->lock | (pEntry->flags << 8);
}
else
{
TRACE("(%04x,%04x): returning 0\n",
ds, handle );
return 0;
}
}
/***********************************************************************
* LocalHeapSize (KERNEL.162)
*/
WORD WINAPI LocalHeapSize16(void)
{
HANDLE16 ds = CURRENT_DS;
LOCALHEAPINFO *pInfo = LOCAL_GetHeap( ds );
return pInfo ? pInfo->last - pInfo->first : 0;
}
/***********************************************************************
* LocalCountFree (KERNEL.161)
*/
WORD WINAPI LocalCountFree16(void)
{
HANDLE16 ds = CURRENT_DS;
WORD arena, total;
LOCALARENA *pArena;
LOCALHEAPINFO *pInfo;
char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
if (!(pInfo = LOCAL_GetHeap( ds )))
{
ERR("(%04x): Local heap not found\n", ds );
LOCAL_PrintHeap( ds );
return 0;
}
total = 0;
arena = pInfo->first;
pArena = ARENA_PTR( ptr, arena );
for (;;)
{
arena = pArena->free_next;
pArena = ARENA_PTR( ptr, arena );
if (arena == pArena->free_next) break;
total += pArena->size;
}
TRACE("(%04x): returning %d\n", ds, total);
return total;
}
/***********************************************************************
* LocalHandle (KERNEL.11)
*/
HLOCAL16 WINAPI LocalHandle16( WORD addr )
{
HANDLE16 ds = CURRENT_DS;
char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
LOCALHEAPINFO *pInfo;
WORD table;
if (!(pInfo = LOCAL_GetHeap( ds )))
{
ERR("(%04x): Local heap not found\n", ds );
LOCAL_PrintHeap( ds );
return 0;
}
/* Find the address in the entry tables */
table = pInfo->htable;
while (table)
{
WORD count = *(WORD *)(ptr + table);
LOCALHANDLEENTRY *pEntry = (LOCALHANDLEENTRY*)(ptr+table+sizeof(WORD));
for (; count > 0; count--, pEntry++)
if (pEntry->addr == addr) return (HLOCAL16)((char *)pEntry - ptr);
table = *(WORD *)pEntry;
}
return (HLOCAL16)addr; /* Fixed block handle is addr */
}
/***********************************************************************
* LocalLock (KERNEL.8)
*
* Note: only the offset part of the pointer is returned by the relay code.
*/
SEGPTR WINAPI LocalLock16( HLOCAL16 handle )
{
WORD ds = CURRENT_DS;
char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
return MAKESEGPTR( ds, LOCAL_InternalLock( ptr, handle ) );
}
/***********************************************************************
* LocalCompact (KERNEL.13)
*/
UINT16 WINAPI LocalCompact16( UINT16 minfree )
{
TRACE("%04x\n", minfree );
return LOCAL_Compact( CURRENT_DS, minfree, 0 );
}
/***********************************************************************
* LocalNotify (KERNEL.14)
*
* Installs a callback function that is called for local memory events
* Callback function prototype is
* BOOL16 NotifyFunc(WORD wMsg, HLOCAL16 hMem, WORD wArg)
* wMsg:
* - LN_OUTOFMEM
* NotifyFunc seems to be responsible for allocating some memory,
* returns TRUE for success.
* wArg = number of bytes needed additionally
* - LN_MOVE
* hMem = handle; wArg = old mem location
* - LN_DISCARD
* NotifyFunc seems to be strongly encouraged to return TRUE,
* otherwise LogError() gets called.
* hMem = handle; wArg = flags
*/
FARPROC16 WINAPI LocalNotify16( FARPROC16 func )
{
LOCALHEAPINFO *pInfo;
FARPROC16 oldNotify;
HANDLE16 ds = CURRENT_DS;
if (!(pInfo = LOCAL_GetHeap( ds )))
{
ERR("(%04x): Local heap not found\n", ds );
LOCAL_PrintHeap( ds );
return 0;
}
TRACE("(%04x): %p\n", ds, func );
FIXME("Half implemented\n");
oldNotify = pInfo->notify;
pInfo->notify = func;
return oldNotify;
}
/***********************************************************************
* LocalShrink (KERNEL.121)
*/
UINT16 WINAPI LocalShrink16( HGLOBAL16 handle, UINT16 newsize )
{
TRACE("%04x %04x\n", handle, newsize );
return 0;
}
/***********************************************************************
* GetHeapSpaces (KERNEL.138)
*/
DWORD WINAPI GetHeapSpaces16( HMODULE16 module )
{
NE_MODULE *pModule;
WORD oldDS = CURRENT_DS;
DWORD spaces;
if (!(pModule = NE_GetPtr( module ))) return 0;
CURRENT_DS = GlobalHandleToSel16((NE_SEG_TABLE( pModule ) + pModule->ne_autodata - 1)->hSeg);
spaces = MAKELONG( LocalCountFree16(), LocalHeapSize16() );
CURRENT_DS = oldDS;
return spaces;
}
/***********************************************************************
* LocalHandleDelta (KERNEL.310)
*/
WORD WINAPI LocalHandleDelta16( WORD delta )
{
LOCALHEAPINFO *pInfo;
if (!(pInfo = LOCAL_GetHeap( CURRENT_DS )))
{
ERR("Local heap not found\n");
LOCAL_PrintHeap( CURRENT_DS );
return 0;
}
if (delta) pInfo->hdelta = delta;
TRACE("returning %04x\n", pInfo->hdelta);
return pInfo->hdelta;
}
/***********************************************************************
* 32-bit local heap functions (Win95; undocumented)
*/
/***********************************************************************
* K208 (KERNEL.208)
*/
HANDLE WINAPI Local32Init16( WORD segment, DWORD tableSize,
DWORD heapSize, DWORD flags )
{
DWORD totSize, segSize = 0;
LPBYTE base;
LOCAL32HEADER *header;
HANDLE heap;
WORD *selectorTable;
WORD selectorEven, selectorOdd;
int i, nrBlocks;
/* Determine new heap size */
if ( segment )
{
if ( (segSize = GetSelectorLimit16( segment )) == 0 )
return 0;
else
segSize++;
}
if ( heapSize == (DWORD)-1 )
heapSize = 1024*1024; /* FIXME */
heapSize = (heapSize + 0xffff) & 0xffff0000;
segSize = (segSize + 0x0fff) & 0xfffff000;
totSize = segSize + HTABLE_SIZE + heapSize;
/* Allocate memory and initialize heap */
if ( !(base = VirtualAlloc( NULL, totSize, MEM_RESERVE, PAGE_READWRITE )) )
return 0;
if ( !VirtualAlloc( base, segSize + HTABLE_PAGESIZE,
MEM_COMMIT, PAGE_READWRITE ) )
{
VirtualFree( base, 0, MEM_RELEASE );
return 0;
}
if (!(heap = RtlCreateHeap( 0, base + segSize + HTABLE_SIZE, heapSize, 0x10000, NULL, NULL )))
{
VirtualFree( base, 0, MEM_RELEASE );
return 0;
}
/* Set up header and handle table */
header = (LOCAL32HEADER *)(base + segSize);
header->base = base;
header->limit = HTABLE_PAGESIZE-1;
header->flags = 0;
header->magic = LOCAL32_MAGIC;
header->heap = heap;
header->freeListFirst[0] = sizeof(LOCAL32HEADER);
header->freeListLast[0] = HTABLE_PAGESIZE - 4;
header->freeListSize[0] = (HTABLE_PAGESIZE - sizeof(LOCAL32HEADER)) / 4;
for (i = header->freeListFirst[0]; i < header->freeListLast[0]; i += 4)
*(DWORD *)((LPBYTE)header + i) = i+4;
header->freeListFirst[1] = 0xffff;
/* Set up selector table */
nrBlocks = (totSize + 0x7fff) >> 15;
selectorTable = HeapAlloc( header->heap, 0, nrBlocks * 2 );
selectorEven = SELECTOR_AllocBlock( base, totSize, LDT_FLAGS_DATA );
selectorOdd = SELECTOR_AllocBlock( base + 0x8000, totSize - 0x8000, LDT_FLAGS_DATA );
if ( !selectorTable || !selectorEven || !selectorOdd )
{
HeapFree( header->heap, 0, selectorTable );
if ( selectorEven ) SELECTOR_FreeBlock( selectorEven );
if ( selectorOdd ) SELECTOR_FreeBlock( selectorOdd );
HeapDestroy( header->heap );
VirtualFree( base, 0, MEM_RELEASE );
return 0;
}
header->selectorTableOffset = (LPBYTE)selectorTable - header->base;
header->selectorTableSize = nrBlocks * 4; /* ??? Win95 does it this way! */
header->selectorDelta = selectorEven - selectorOdd;
header->segment = segment? segment : selectorEven;
for (i = 0; i < nrBlocks; i++)
selectorTable[i] = (i & 1)? selectorOdd + ((i >> 1) << __AHSHIFT)
: selectorEven + ((i >> 1) << __AHSHIFT);
/* Move old segment */
if ( segment )
{
/* FIXME: This is somewhat ugly and relies on implementation
details about 16-bit global memory handles ... */
LPBYTE oldBase = (LPBYTE)GetSelectorBase( segment );
memcpy( base, oldBase, segSize );
GLOBAL_MoveBlock( segment, base, totSize );
HeapFree( GetProcessHeap(), 0, oldBase );
}
return header;
}
/***********************************************************************
* Local32_SearchHandle
*/
static LPDWORD Local32_SearchHandle( LOCAL32HEADER *header, DWORD addr )
{
LPDWORD handle;
for ( handle = (LPDWORD)((LPBYTE)header + sizeof(LOCAL32HEADER));
handle < (LPDWORD)((LPBYTE)header + header->limit);
handle++)
{
if (*handle == addr)
return handle;
}
return NULL;
}
/***********************************************************************
* Local32_ToHandle
*/
static VOID Local32_ToHandle( LOCAL32HEADER *header, INT16 type,
DWORD addr, LPDWORD *handle, LPBYTE *ptr )
{
*handle = NULL;
*ptr = NULL;
switch (type)
{
case -2: /* 16:16 pointer, no handles */
*ptr = MapSL( addr );
*handle = (LPDWORD)*ptr;
break;
case -1: /* 32-bit offset, no handles */
*ptr = header->base + addr;
*handle = (LPDWORD)*ptr;
break;
case 0: /* handle */
if ( addr >= sizeof(LOCAL32HEADER)
&& addr < header->limit && !(addr & 3)
&& *(LPDWORD)((LPBYTE)header + addr) >= HTABLE_SIZE )
{
*handle = (LPDWORD)((LPBYTE)header + addr);
*ptr = header->base + **handle;
}
break;
case 1: /* 16:16 pointer */
*ptr = MapSL( addr );
*handle = Local32_SearchHandle( header, *ptr - header->base );
break;
case 2: /* 32-bit offset */
*ptr = header->base + addr;
*handle = Local32_SearchHandle( header, *ptr - header->base );
break;
}
}
/***********************************************************************
* Local32_FromHandle
*/
static VOID Local32_FromHandle( LOCAL32HEADER *header, INT16 type,
DWORD *addr, LPDWORD handle, LPBYTE ptr )
{
*addr = 0;
switch (type)
{
case -2: /* 16:16 pointer */
case 1:
{
WORD *selTable = (LPWORD)(header->base + header->selectorTableOffset);
DWORD offset = ptr - header->base;
*addr = MAKELONG( offset & 0x7fff, selTable[offset >> 15] );
}
break;
case -1: /* 32-bit offset */
case 2:
*addr = ptr - header->base;
break;
case 0: /* handle */
*addr = (LPBYTE)handle - (LPBYTE)header;
break;
}
}
/***********************************************************************
* K209 (KERNEL.209)
*/
DWORD WINAPI Local32Alloc16( HANDLE heap, DWORD size, INT16 type, DWORD flags )
{
LOCAL32HEADER *header = heap;
LPDWORD handle;
LPBYTE ptr;
DWORD addr;
/* Allocate memory */
ptr = HeapAlloc( header->heap,
(flags & LMEM_MOVEABLE)? HEAP_ZERO_MEMORY : 0, size );
if (!ptr) return 0;
/* Allocate handle if requested */
if (type >= 0)
{
int page, i;
/* Find first page of handle table with free slots */
for (page = 0; page < HTABLE_NPAGES; page++)
if (header->freeListFirst[page] != 0)
break;
if (page == HTABLE_NPAGES)
{
WARN("Out of handles!\n" );
HeapFree( header->heap, 0, ptr );
return 0;
}
/* If virgin page, initialize it */
if (header->freeListFirst[page] == 0xffff)
{
if ( !VirtualAlloc( (LPBYTE)header + (page << 12),
0x1000, MEM_COMMIT, PAGE_READWRITE ) )
{
WARN("Cannot grow handle table!\n" );
HeapFree( header->heap, 0, ptr );
return 0;
}
header->limit += HTABLE_PAGESIZE;
header->freeListFirst[page] = 0;
header->freeListLast[page] = HTABLE_PAGESIZE - 4;
header->freeListSize[page] = HTABLE_PAGESIZE / 4;
for (i = 0; i < HTABLE_PAGESIZE; i += 4)
*(DWORD *)((LPBYTE)header + i) = i+4;
if (page < HTABLE_NPAGES-1)
header->freeListFirst[page+1] = 0xffff;
}
/* Allocate handle slot from page */
handle = (LPDWORD)((LPBYTE)header + header->freeListFirst[page]);
if (--header->freeListSize[page] == 0)
header->freeListFirst[page] = header->freeListLast[page] = 0;
else
header->freeListFirst[page] = *handle;
/* Store 32-bit offset in handle slot */
*handle = ptr - header->base;
}
else
{
handle = (LPDWORD)ptr;
header->flags |= 1;
}
/* Convert handle to requested output type */
Local32_FromHandle( header, type, &addr, handle, ptr );
return addr;
}
/***********************************************************************
* K210 (KERNEL.210)
*/
DWORD WINAPI Local32ReAlloc16( HANDLE heap, DWORD addr, INT16 type,
DWORD size, DWORD flags )
{
LOCAL32HEADER *header = heap;
LPDWORD handle;
LPBYTE ptr;
if (!addr)
return Local32Alloc16( heap, size, type, flags );
/* Retrieve handle and pointer */
Local32_ToHandle( header, type, addr, &handle, &ptr );
if (!handle) return FALSE;
/* Reallocate memory block */
ptr = HeapReAlloc( header->heap,
(flags & LMEM_MOVEABLE)? HEAP_ZERO_MEMORY : 0,
ptr, size );
if (!ptr) return 0;
/* Modify handle */
if (type >= 0)
*handle = ptr - header->base;
else
handle = (LPDWORD)ptr;
/* Convert handle to requested output type */
Local32_FromHandle( header, type, &addr, handle, ptr );
return addr;
}
/***********************************************************************
* K211 (KERNEL.211)
*/
BOOL WINAPI Local32Free16( HANDLE heap, DWORD addr, INT16 type )
{
LOCAL32HEADER *header = heap;
LPDWORD handle;
LPBYTE ptr;
/* Retrieve handle and pointer */
Local32_ToHandle( header, type, addr, &handle, &ptr );
if (!handle) return FALSE;
/* Free handle if necessary */
if (type >= 0)
{
int offset = (LPBYTE)handle - (LPBYTE)header;
int page = offset >> 12;
/* Return handle slot to page free list */
if (header->freeListSize[page]++ == 0)
header->freeListFirst[page] = header->freeListLast[page] = offset;
else
*(LPDWORD)((LPBYTE)header + header->freeListLast[page]) = offset,
header->freeListLast[page] = offset;
*handle = 0;
/* Shrink handle table when possible */
while (page > 0 && header->freeListSize[page] == HTABLE_PAGESIZE / 4)
{
if ( VirtualFree( (LPBYTE)header +
(header->limit & ~(HTABLE_PAGESIZE-1)),
HTABLE_PAGESIZE, MEM_DECOMMIT ) )
break;
header->limit -= HTABLE_PAGESIZE;
header->freeListFirst[page] = 0xffff;
page--;
}
}
/* Free memory */
return HeapFree( header->heap, 0, ptr );
}
/***********************************************************************
* K213 (KERNEL.213)
*/
DWORD WINAPI Local32Translate16( HANDLE heap, DWORD addr, INT16 type1, INT16 type2 )
{
LOCAL32HEADER *header = heap;
LPDWORD handle;
LPBYTE ptr;
Local32_ToHandle( header, type1, addr, &handle, &ptr );
if (!handle) return 0;
Local32_FromHandle( header, type2, &addr, handle, ptr );
return addr;
}
/***********************************************************************
* K214 (KERNEL.214)
*/
DWORD WINAPI Local32Size16( HANDLE heap, DWORD addr, INT16 type )
{
LOCAL32HEADER *header = heap;
LPDWORD handle;
LPBYTE ptr;
Local32_ToHandle( header, type, addr, &handle, &ptr );
if (!handle) return 0;
return HeapSize( header->heap, 0, ptr );
}
/***********************************************************************
* K215 (KERNEL.215)
*/
BOOL WINAPI Local32ValidHandle16( HANDLE heap, WORD addr )
{
LOCAL32HEADER *header = heap;
LPDWORD handle;
LPBYTE ptr;
Local32_ToHandle( header, 0, addr, &handle, &ptr );
return handle != NULL;
}
/***********************************************************************
* K229 (KERNEL.229)
*/
WORD WINAPI Local32GetSegment16( HANDLE heap )
{
LOCAL32HEADER *header = heap;
return header->segment;
}
/***********************************************************************
* Local32_GetHeap
*/
static LOCAL32HEADER *Local32_GetHeap( HGLOBAL16 handle )
{
WORD selector = GlobalHandleToSel16( handle );
DWORD base = GetSelectorBase( selector );
DWORD limit = GetSelectorLimit16( selector );
/* Hmmm. This is a somewhat stupid heuristic, but Windows 95 does
it this way ... */
if ( limit > 0x10000 && ((LOCAL32HEADER *)base)->magic == LOCAL32_MAGIC )
return (LOCAL32HEADER *)base;
base += 0x10000;
limit -= 0x10000;
if ( limit > 0x10000 && ((LOCAL32HEADER *)base)->magic == LOCAL32_MAGIC )
return (LOCAL32HEADER *)base;
return NULL;
}
/***********************************************************************
* Local32Info (KERNEL.444)
*/
BOOL16 WINAPI Local32Info16( LOCAL32INFO *pLocal32Info, HGLOBAL16 handle )
{
PROCESS_HEAP_ENTRY entry;
int i;
LOCAL32HEADER *header = Local32_GetHeap( handle );
if ( !header ) return FALSE;
if ( !pLocal32Info || pLocal32Info->dwSize < sizeof(LOCAL32INFO) )
return FALSE;
pLocal32Info->dwMemReserved = 0;
pLocal32Info->dwMemCommitted = 0;
pLocal32Info->dwTotalFree = 0;
pLocal32Info->dwLargestFreeBlock = 0;
while (HeapWalk( header->heap, &entry ))
{
if (entry.wFlags & PROCESS_HEAP_REGION)
{
pLocal32Info->dwMemReserved += entry.Region.dwCommittedSize
+ entry.Region.dwUnCommittedSize;
pLocal32Info->dwMemCommitted = entry.Region.dwCommittedSize;
}
else if (!(entry.wFlags & PROCESS_HEAP_ENTRY_BUSY))
{
DWORD size = entry.cbData + entry.cbOverhead;
pLocal32Info->dwTotalFree += size;
if (size > pLocal32Info->dwLargestFreeBlock) pLocal32Info->dwLargestFreeBlock = size;
}
}
pLocal32Info->dwcFreeHandles = 0;
for ( i = 0; i < HTABLE_NPAGES; i++ )
{
if ( header->freeListFirst[i] == 0xffff ) break;
pLocal32Info->dwcFreeHandles += header->freeListSize[i];
}
pLocal32Info->dwcFreeHandles += (HTABLE_NPAGES - i) * HTABLE_PAGESIZE/4;
return TRUE;
}
/***********************************************************************
* Local32First (KERNEL.445)
*/
BOOL16 WINAPI Local32First16( LOCAL32ENTRY *pLocal32Entry, HGLOBAL16 handle )
{
FIXME("(%p, %04X): stub!\n", pLocal32Entry, handle );
return FALSE;
}
/***********************************************************************
* Local32Next (KERNEL.446)
*/
BOOL16 WINAPI Local32Next16( LOCAL32ENTRY *pLocal32Entry )
{
FIXME("(%p): stub!\n", pLocal32Entry );
return FALSE;
}
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