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[wine/multimedia.git] / dlls / kernel32 / local16.c
blob3470b31232ddc55e50ba50ce28a7e3b59a12f47d
1 /*
2 * 16-bit local heap functions
3 *
4 * Copyright 1995 Alexandre Julliard
5 * Copyright 1996 Huw Davies
6 * Copyright 1998 Ulrich Weigand
7 *
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with this library; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
21 */
22
23 /*
24 * Note:
25 * All local heap functions need the current DS as first parameter
26 * when called from the emulation library, so they take one more
27 * parameter than usual.
28 */
29
30 #include "config.h"
31
32 #define NONAMELESSUNION
33 #define NONAMELESSSTRUCT
34 #include <stdlib.h>
35 #include <string.h>
36 #include "wine/winbase16.h"
37 #include "wownt32.h"
38 #include "winternl.h"
39 #include "kernel_private.h"
40 #include "kernel16_private.h"
41 #include "wine/debug.h"
42
43 WINE_DEFAULT_DEBUG_CHANNEL(local);
44
45 typedef struct
46 {
47 /* Arena header */
48 WORD prev; /* Previous arena | arena type */
49 WORD next; /* Next arena */
50 /* Start of the memory block or free-list info */
51 WORD size; /* Size of the free block */
52 WORD free_prev; /* Previous free block */
53 WORD free_next; /* Next free block */
54 } LOCALARENA;
55
56 #define ARENA_HEADER_SIZE 4
57 #define ARENA_HEADER( handle) ((handle) - ARENA_HEADER_SIZE)
58
59 /* Arena types (stored in 'prev' field of the arena) */
60 #define LOCAL_ARENA_FREE 0
61 #define LOCAL_ARENA_FIXED 1
62
63 /* LocalNotify() msgs */
64
65 #define LN_OUTOFMEM 0
66 #define LN_MOVE 1
67 #define LN_DISCARD 2
68
69 /* Layout of a handle entry table
70 *
71 * WORD count of entries
72 * LOCALHANDLEENTRY[count] entries
73 * WORD near ptr to next table
74 */
75 typedef struct
76 {
77 WORD addr; /* Address of the MOVEABLE block */
78 BYTE flags; /* Flags for this block */
79 BYTE lock; /* Lock count */
80 } LOCALHANDLEENTRY;
81
82 /*
83 * We make addr = 4n + 2 and set *((WORD *)addr - 1) = &addr like Windows does
84 * in case something actually relies on this.
85 * Note that if the architecture does not allow unaligned accesses, we make
86 * addr = 4n + 4 to avoid returning unaligned pointers from LocalAlloc etc.
87 *
88 * An unused handle has lock = flags = 0xff. In windows addr is that of next
89 * free handle, at the moment in wine we set it to 0.
90 *
91 * A discarded block's handle has lock = addr = 0 and flags = 0x40
92 * (LMEM_DISCARDED >> 8)
93 */
94
95 #ifdef ALLOW_UNALIGNED_ACCESS
96 # define MOVEABLE_PREFIX sizeof(HLOCAL16)
97 #else
98 # define MOVEABLE_PREFIX sizeof(int)
99 #endif
100
101
102 #include "pshpack1.h"
103
104 typedef struct
105 {
106 WORD check; /* 00 Heap checking flag */
107 WORD freeze; /* 02 Heap frozen flag */
108 WORD items; /* 04 Count of items on the heap */
109 WORD first; /* 06 First item of the heap */
110 WORD pad1; /* 08 Always 0 */
111 WORD last; /* 0a Last item of the heap */
112 WORD pad2; /* 0c Always 0 */
113 BYTE ncompact; /* 0e Compactions counter */
114 BYTE dislevel; /* 0f Discard level */
115 DWORD distotal; /* 10 Total bytes discarded */
116 WORD htable; /* 14 Pointer to handle table */
117 WORD hfree; /* 16 Pointer to free handle table */
118 WORD hdelta; /* 18 Delta to expand the handle table */
119 WORD expand; /* 1a Pointer to expand function (unused) */
120 WORD pstat; /* 1c Pointer to status structure (unused) */
121 FARPROC16 notify; /* 1e Pointer to LocalNotify() function */
122 WORD lock; /* 22 Lock count for the heap */
123 WORD extra; /* 24 Extra bytes to allocate when expanding */
124 WORD minsize; /* 26 Minimum size of the heap */
125 WORD magic; /* 28 Magic number */
126 } LOCALHEAPINFO;
127
128 typedef struct
129 {
130 DWORD dwSize; /* 00 */
131 DWORD dwMemReserved; /* 04 */
132 DWORD dwMemCommitted; /* 08 */
133 DWORD dwTotalFree; /* 0C */
134 DWORD dwLargestFreeBlock; /* 10 */
135 DWORD dwcFreeHandles; /* 14 */
136 } LOCAL32INFO;
137
138 typedef struct
139 {
140 DWORD dwSize; /* 00 */
141 WORD hHandle; /* 04 */
142 DWORD dwAddress; /* 06 */
143 DWORD dwSizeBlock; /* 0A */
144 WORD wFlags; /* 0E */
145 WORD wType; /* 10 */
146 WORD hHeap; /* 12 */
147 WORD wHeapType; /* 14 */
148 DWORD dwNext; /* 16 */
149 DWORD dwNextAlt; /* 1A */
150 } LOCAL32ENTRY;
151
152 #include "poppack.h"
153
154 #define LOCAL_HEAP_MAGIC 0x484c /* 'LH' */
155
156 /* All local heap allocations are aligned on 4-byte boundaries */
157 #define LALIGN(word) (((word) + 3) & ~3)
158
159 #define ARENA_PTR(ptr,arena) ((LOCALARENA *)((char *)(ptr)+(arena)))
160 #define ARENA_PREV(ptr,arena) (ARENA_PTR((ptr),(arena))->prev & ~3)
161 #define ARENA_NEXT(ptr,arena) (ARENA_PTR((ptr),(arena))->next)
162 #define ARENA_FLAGS(ptr,arena) (ARENA_PTR((ptr),(arena))->prev & 3)
163
164 /* determine whether the handle belongs to a fixed or a moveable block */
165 #define HANDLE_FIXED(handle) (((handle) & 3) == 0)
166 #define HANDLE_MOVEABLE(handle) (((handle) & 3) == 2)
167
168
169 /* 32-bit heap definitions */
170
171 #define HTABLE_SIZE 0x10000
172 #define HTABLE_PAGESIZE 0x1000
173 #define HTABLE_NPAGES (HTABLE_SIZE / HTABLE_PAGESIZE)
174
175 #include "pshpack1.h"
176 typedef struct _LOCAL32HEADER
177 {
178 WORD freeListFirst[HTABLE_NPAGES];
179 WORD freeListSize[HTABLE_NPAGES];
180 WORD freeListLast[HTABLE_NPAGES];
181
182 DWORD selectorTableOffset;
183 WORD selectorTableSize;
184 WORD selectorDelta;
185
186 DWORD segment;
187 LPBYTE base;
188
189 DWORD limit;
190 DWORD flags;
191
192 DWORD magic;
193 HANDLE heap;
194
195 } LOCAL32HEADER;
196 #include "poppack.h"
197
198 #define LOCAL32_MAGIC ((DWORD)('L' | ('H'<<8) | ('3'<<16) | ('2'<<24)))
199
200
201 static inline BOOL16 call_notify_func( FARPROC16 proc, WORD msg, HLOCAL16 handle, WORD arg )
202 {
203 DWORD ret;
204 WORD args[3];
205
206 if (!proc) return FALSE;
207 args[2] = msg;
208 args[1] = handle;
209 args[0] = arg;
210 WOWCallback16Ex( (DWORD)proc, WCB16_PASCAL, sizeof(args), args, &ret );
211 return LOWORD(ret);
212 }
213
214
215 /***********************************************************************
216 * LOCAL_GetHeap
217 *
218 * Return a pointer to the local heap, making sure it exists.
219 */
220 static LOCALHEAPINFO *LOCAL_GetHeap( HANDLE16 ds )
221 {
222 LOCALHEAPINFO *pInfo;
223 INSTANCEDATA *ptr = MapSL( MAKESEGPTR( ds, 0 ));
224 TRACE("Heap at %p, %04x\n", ptr, (ptr != NULL ? ptr->heap : 0xFFFF));
225 if (!ptr || !ptr->heap) return NULL;
226 if (IsBadReadPtr16( (SEGPTR)MAKELONG(ptr->heap,ds), sizeof(LOCALHEAPINFO)))
227 {
228 WARN("Bad pointer\n");
229 return NULL;
230 }
231 pInfo = (LOCALHEAPINFO*)((char*)ptr + ptr->heap);
232 if (pInfo->magic != LOCAL_HEAP_MAGIC)
233 {
234 WARN("Bad magic\n");
235 return NULL;
236 }
237 return pInfo;
238 }
239
240
241 /***********************************************************************
242 * LOCAL_MakeBlockFree
243 *
244 * Make a block free, inserting it in the free-list.
245 * 'block' is the handle of the block arena; 'baseptr' points to
246 * the beginning of the data segment containing the heap.
247 */
248 static void LOCAL_MakeBlockFree( char *baseptr, WORD block )
249 {
250 LOCALARENA *pArena, *pNext;
251 WORD next;
252
253 /* Mark the block as free */
254
255 pArena = ARENA_PTR( baseptr, block );
256 pArena->prev = (pArena->prev & ~3) | LOCAL_ARENA_FREE;
257 pArena->size = pArena->next - block;
258
259 /* Find the next free block (last block is always free) */
260
261 next = pArena->next;
262 for (;;)
263 {
264 pNext = ARENA_PTR( baseptr, next );
265 if ((pNext->prev & 3) == LOCAL_ARENA_FREE) break;
266 next = pNext->next;
267 }
268
269 TRACE("%04x, next %04x\n", block, next );
270 /* Insert the free block in the free-list */
271
272 pArena->free_prev = pNext->free_prev;
273 pArena->free_next = next;
274 ARENA_PTR(baseptr,pNext->free_prev)->free_next = block;
275 pNext->free_prev = block;
276 }
277
278
279 /***********************************************************************
280 * LOCAL_RemoveFreeBlock
281 *
282 * Remove a block from the free-list.
283 * 'block' is the handle of the block arena; 'baseptr' points to
284 * the beginning of the data segment containing the heap.
285 */
286 static void LOCAL_RemoveFreeBlock( char *baseptr, WORD block )
287 {
288 /* Mark the block as fixed */
289
290 LOCALARENA *pArena = ARENA_PTR( baseptr, block );
291 pArena->prev = (pArena->prev & ~3) | LOCAL_ARENA_FIXED;
292
293 /* Remove it from the list */
294
295 ARENA_PTR(baseptr,pArena->free_prev)->free_next = pArena->free_next;
296 ARENA_PTR(baseptr,pArena->free_next)->free_prev = pArena->free_prev;
297 }
298
299
300 /***********************************************************************
301 * LOCAL_AddBlock
302 *
303 * Insert a new block in the heap.
304 * 'new' is the handle of the new block arena; 'baseptr' points to
305 * the beginning of the data segment containing the heap; 'prev' is
306 * the block before the new one.
307 */
308 static void LOCAL_AddBlock( char *baseptr, WORD prev, WORD new )
309 {
310 LOCALARENA *pPrev = ARENA_PTR( baseptr, prev );
311 LOCALARENA *pNew = ARENA_PTR( baseptr, new );
312
313 pNew->prev = (prev & ~3) | LOCAL_ARENA_FIXED;
314 pNew->next = pPrev->next;
315 ARENA_PTR(baseptr,pPrev->next)->prev &= 3;
316 ARENA_PTR(baseptr,pPrev->next)->prev |= new;
317 pPrev->next = new;
318 }
319
320
321 /***********************************************************************
322 * LOCAL_RemoveBlock
323 *
324 * Remove a block from the heap.
325 * 'block' is the handle of the block arena; 'baseptr' points to
326 * the beginning of the data segment containing the heap.
327 */
328 static void LOCAL_RemoveBlock( char *baseptr, WORD block )
329 {
330 LOCALARENA *pArena, *pTmp;
331
332 /* Remove the block from the free-list */
333
334 TRACE("\n");
335 pArena = ARENA_PTR( baseptr, block );
336 if ((pArena->prev & 3) == LOCAL_ARENA_FREE)
337 LOCAL_RemoveFreeBlock( baseptr, block );
338
339 /* If the previous block is free, expand its size */
340
341 pTmp = ARENA_PTR( baseptr, pArena->prev & ~3 );
342 if ((pTmp->prev & 3) == LOCAL_ARENA_FREE)
343 pTmp->size += pArena->next - block;
344
345 /* Remove the block from the linked list */
346
347 pTmp->next = pArena->next;
348 pTmp = ARENA_PTR( baseptr, pArena->next );
349 pTmp->prev = (pTmp->prev & 3) | (pArena->prev & ~3);
350 }
351
352
353 /***********************************************************************
354 * LOCAL_PrintHeap
355 */
356 static void LOCAL_PrintHeap( HANDLE16 ds )
357 {
358 char *ptr;
359 LOCALHEAPINFO *pInfo;
360 WORD arena;
361
362 /* FIXME - the test should be done when calling the function!
363 plus is not clear that we should print this info
364 only when TRACE_ON is on! */
365 if(!TRACE_ON(local)) return;
366
367 ptr = MapSL( MAKESEGPTR( ds, 0 ));
368 pInfo = LOCAL_GetHeap( ds );
369
370 if (!pInfo)
371 {
372 ERR( "Local Heap corrupted! ds=%04x\n", ds );
373 return;
374 }
375 TRACE( "Local Heap ds=%04x first=%04x last=%04x items=%d\n",
376 ds, pInfo->first, pInfo->last, pInfo->items );
377
378 arena = pInfo->first;
379 for (;;)
380 {
381 LOCALARENA *pArena = ARENA_PTR(ptr,arena);
382 TRACE( " %04x: prev=%04x next=%04x type=%d\n", arena,
383 pArena->prev & ~3, pArena->next, pArena->prev & 3 );
384 if (arena == pInfo->first)
385 {
386 TRACE( " size=%d free_prev=%04x free_next=%04x\n",
387 pArena->size, pArena->free_prev, pArena->free_next );
388 }
389 if ((pArena->prev & 3) == LOCAL_ARENA_FREE)
390 {
391 TRACE( " size=%d free_prev=%04x free_next=%04x\n",
392 pArena->size, pArena->free_prev, pArena->free_next );
393 if (pArena->next == arena) break; /* last one */
394 if (ARENA_PTR(ptr,pArena->free_next)->free_prev != arena)
395 {
396 TRACE( "*** arena->free_next->free_prev != arena\n" );
397 break;
398 }
399 }
400 if (pArena->next == arena)
401 {
402 TRACE( "*** last block is not marked free\n" );
403 break;
404 }
405 if ((ARENA_PTR(ptr,pArena->next)->prev & ~3) != arena)
406 {
407 TRACE( "*** arena->next->prev != arena (%04x, %04x)\n",
408 pArena->next, ARENA_PTR(ptr,pArena->next)->prev);
409 break;
410 }
411 arena = pArena->next;
412 }
413 }
414
415
416 /***********************************************************************
417 * LocalInit (KERNEL.4)
418 */
419 BOOL16 WINAPI LocalInit16( HANDLE16 selector, WORD start, WORD end )
420 {
421 char *ptr;
422 WORD heapInfoArena, freeArena, lastArena;
423 LOCALHEAPINFO *pHeapInfo;
424 LOCALARENA *pArena, *pFirstArena, *pLastArena;
425 BOOL16 ret = FALSE;
426
427 /* The initial layout of the heap is: */
428 /* - first arena (FIXED) */
429 /* - heap info structure (FIXED) */
430 /* - large free block (FREE) */
431 /* - last arena (FREE) */
432
433 TRACE("%04x %04x-%04x\n", selector, start, end);
434 if (!selector) selector = CURRENT_DS;
435
436 if (TRACE_ON(local))
437 {
438 /* If TRACE_ON(local) is set, the global heap blocks are */
439 /* cleared before use, so we can test for double initialization. */
440 if (LOCAL_GetHeap(selector))
441 {
442 ERR("Heap %04x initialized twice.\n", selector);
443 LOCAL_PrintHeap(selector);
444 }
445 }
446
447 if (start == 0)
448 {
449 /* start == 0 means: put the local heap at the end of the segment */
450
451 DWORD size = GlobalSize16( GlobalHandle16( selector ) );
452 start = (WORD)(size > 0xffff ? 0xffff : size) - 1;
453 if ( end > 0xfffe ) end = 0xfffe;
454 start -= end;
455 end += start;
456 }
457 ptr = MapSL( MAKESEGPTR( selector, 0 ) );
458
459 start = LALIGN( max( start, sizeof(INSTANCEDATA) ) );
460 heapInfoArena = LALIGN(start + sizeof(LOCALARENA) );
461 freeArena = LALIGN( heapInfoArena + ARENA_HEADER_SIZE
462 + sizeof(LOCALHEAPINFO) );
463 lastArena = (end - sizeof(LOCALARENA)) & ~3;
464
465 /* Make sure there's enough space. */
466
467 if (freeArena + sizeof(LOCALARENA) >= lastArena) goto done;
468
469 /* Initialise the first arena */
470
471 pFirstArena = ARENA_PTR( ptr, start );
472 pFirstArena->prev = start | LOCAL_ARENA_FIXED;
473 pFirstArena->next = heapInfoArena;
474 pFirstArena->size = LALIGN(sizeof(LOCALARENA));
475 pFirstArena->free_prev = start; /* this one */
476 pFirstArena->free_next = freeArena;
477
478 /* Initialise the arena of the heap info structure */
479
480 pArena = ARENA_PTR( ptr, heapInfoArena );
481 pArena->prev = start | LOCAL_ARENA_FIXED;
482 pArena->next = freeArena;
483
484 /* Initialise the heap info structure */
485
486 pHeapInfo = (LOCALHEAPINFO *) (ptr + heapInfoArena + ARENA_HEADER_SIZE );
487 memset( pHeapInfo, 0, sizeof(LOCALHEAPINFO) );
488 pHeapInfo->items = 4;
489 pHeapInfo->first = start;
490 pHeapInfo->last = lastArena;
491 pHeapInfo->htable = 0;
492 pHeapInfo->hdelta = 0x20;
493 pHeapInfo->extra = 0x200;
494 pHeapInfo->minsize = lastArena - freeArena;
495 pHeapInfo->magic = LOCAL_HEAP_MAGIC;
496
497 /* Initialise the large free block */
498
499 pArena = ARENA_PTR( ptr, freeArena );
500 pArena->prev = heapInfoArena | LOCAL_ARENA_FREE;
501 pArena->next = lastArena;
502 pArena->size = lastArena - freeArena;
503 pArena->free_prev = start;
504 pArena->free_next = lastArena;
505
506 /* Initialise the last block */
507
508 pLastArena = ARENA_PTR( ptr, lastArena );
509 pLastArena->prev = freeArena | LOCAL_ARENA_FREE;
510 pLastArena->next = lastArena; /* this one */
511 pLastArena->size = LALIGN(sizeof(LOCALARENA));
512 pLastArena->free_prev = freeArena;
513 pLastArena->free_next = lastArena; /* this one */
514
515 /* Store the local heap address in the instance data */
516
517 ((INSTANCEDATA *)ptr)->heap = heapInfoArena + ARENA_HEADER_SIZE;
518 LOCAL_PrintHeap( selector );
519 ret = TRUE;
520
521 done:
522 CURRENT_STACK16->ecx = ret; /* must be returned in cx too */
523 return ret;
524 }
525
526
527 /***********************************************************************
528 * LOCAL_GrowHeap
529 */
530 static BOOL16 LOCAL_GrowHeap( HANDLE16 ds )
531 {
532 HANDLE16 hseg;
533 LONG oldsize;
534 LONG end;
535 LOCALHEAPINFO *pHeapInfo;
536 WORD freeArena, lastArena;
537 LOCALARENA *pArena, *pLastArena;
538 char *ptr;
539
540 hseg = GlobalHandle16( ds );
541 /* maybe mem allocated by Virtual*() ? */
542 if (!hseg) return FALSE;
543
544 oldsize = GlobalSize16( hseg );
545 /* if nothing can be gained, return */
546 if (oldsize > 0xfff0) return FALSE;
547 hseg = GlobalReAlloc16( hseg, 0x10000, GMEM_FIXED );
548 ptr = MapSL( MAKESEGPTR( ds, 0 ) );
549 pHeapInfo = LOCAL_GetHeap( ds );
550 if (pHeapInfo == NULL) {
551 ERR("Heap not found\n" );
552 return FALSE;
553 }
554 end = GlobalSize16( hseg );
555 lastArena = (end - sizeof(LOCALARENA)) & ~3;
556
557 /* Update the HeapInfo */
558 pHeapInfo->items++;
559 freeArena = pHeapInfo->last;
560 pHeapInfo->last = lastArena;
561 pHeapInfo->minsize += end - oldsize;
562
563 /* grow the old last block */
564 pArena = ARENA_PTR( ptr, freeArena );
565 pArena->size = lastArena - freeArena;
566 pArena->next = lastArena;
567 pArena->free_next = lastArena;
568
569 /* Initialise the new last block */
570
571 pLastArena = ARENA_PTR( ptr, lastArena );
572 pLastArena->prev = freeArena | LOCAL_ARENA_FREE;
573 pLastArena->next = lastArena; /* this one */
574 pLastArena->size = LALIGN(sizeof(LOCALARENA));
575 pLastArena->free_prev = freeArena;
576 pLastArena->free_next = lastArena; /* this one */
577
578 /* If block before freeArena is also free then merge them */
579 if((ARENA_PTR(ptr, (pArena->prev & ~3))->prev & 3) == LOCAL_ARENA_FREE)
580 {
581 LOCAL_RemoveBlock(ptr, freeArena);
582 pHeapInfo->items--;
583 }
584
585 TRACE("Heap expanded\n" );
586 LOCAL_PrintHeap( ds );
587 return TRUE;
588 }
589
590
591 /***********************************************************************
592 * LOCAL_FreeArena
593 */
594 static HLOCAL16 LOCAL_FreeArena( WORD ds, WORD arena )
595 {
596 char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
597 LOCALHEAPINFO *pInfo;
598 LOCALARENA *pArena, *pPrev;
599
600 TRACE("%04x ds=%04x\n", arena, ds );
601 if (!(pInfo = LOCAL_GetHeap( ds ))) return arena;
602
603 pArena = ARENA_PTR( ptr, arena );
604 if ((pArena->prev & 3) == LOCAL_ARENA_FREE)
605 {
606 /* shouldn't happen */
607 ERR("Trying to free block %04x twice!\n",
608 arena );
609 LOCAL_PrintHeap( ds );
610 return arena;
611 }
612
613 /* Check if we can merge with the previous block */
614
615 pPrev = ARENA_PTR( ptr, pArena->prev & ~3 );
616 if ((pPrev->prev & 3) == LOCAL_ARENA_FREE)
617 {
618 arena = pArena->prev & ~3;
619 pArena = pPrev;
620 LOCAL_RemoveBlock( ptr, pPrev->next );
621 pInfo->items--;
622 }
623 else /* Make a new free block */
624 {
625 LOCAL_MakeBlockFree( ptr, arena );
626 }
627
628 /* Check if we can merge with the next block */
629
630 if ((pArena->next == pArena->free_next) &&
631 (pArena->next != pInfo->last))
632 {
633 LOCAL_RemoveBlock( ptr, pArena->next );
634 pInfo->items--;
635 }
636 return 0;
637 }
638
639
640 /***********************************************************************
641 * LOCAL_ShrinkArena
642 *
643 * Shrink an arena by creating a free block at its end if possible.
644 * 'size' includes the arena header, and must be aligned.
645 */
646 static void LOCAL_ShrinkArena( WORD ds, WORD arena, WORD size )
647 {
648 char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
649 LOCALARENA *pArena = ARENA_PTR( ptr, arena );
650
651 if (arena + size + LALIGN(sizeof(LOCALARENA)) < pArena->next)
652 {
653 LOCALHEAPINFO *pInfo = LOCAL_GetHeap( ds );
654 if (!pInfo) return;
655 LOCAL_AddBlock( ptr, arena, arena + size );
656 pInfo->items++;
657 LOCAL_FreeArena( ds, arena + size );
658 }
659 }
660
661
662 /***********************************************************************
663 * LOCAL_GrowArenaDownward
664 *
665 * Grow an arena downward by using the previous arena (must be free).
666 */
667 static void LOCAL_GrowArenaDownward( WORD ds, WORD arena, WORD newsize )
668 {
669 char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
670 LOCALHEAPINFO *pInfo;
671 LOCALARENA *pArena = ARENA_PTR( ptr, arena );
672 WORD prevArena = pArena->prev & ~3;
673 LOCALARENA *pPrevArena = ARENA_PTR( ptr, prevArena );
674 WORD offset, size;
675 char *p;
676
677 if (!(pInfo = LOCAL_GetHeap( ds ))) return;
678 offset = pPrevArena->size;
679 size = pArena->next - arena - ARENA_HEADER_SIZE;
680 LOCAL_RemoveFreeBlock( ptr, prevArena );
681 LOCAL_RemoveBlock( ptr, arena );
682 pInfo->items--;
683 p = (char *)pPrevArena + ARENA_HEADER_SIZE;
684 while (offset < size)
685 {
686 memcpy( p, p + offset, offset );
687 p += offset;
688 size -= offset;
689 }
690 if (size) memcpy( p, p + offset, size );
691 LOCAL_ShrinkArena( ds, prevArena, newsize );
692 }
693
694
695
696 /***********************************************************************
697 * LOCAL_GrowArenaUpward
698 *
699 * Grow an arena upward by using the next arena (must be free and big
700 * enough). Newsize includes the arena header and must be aligned.
701 */
702 static void LOCAL_GrowArenaUpward( WORD ds, WORD arena, WORD newsize )
703 {
704 char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
705 LOCALHEAPINFO *pInfo;
706 LOCALARENA *pArena = ARENA_PTR( ptr, arena );
707 WORD nextArena = pArena->next;
708
709 if (!(pInfo = LOCAL_GetHeap( ds ))) return;
710 LOCAL_RemoveBlock( ptr, nextArena );
711 pInfo->items--;
712 LOCAL_ShrinkArena( ds, arena, newsize );
713 }
714
715
716 /***********************************************************************
717 * LOCAL_GetFreeSpace
718 */
719 static WORD LOCAL_GetFreeSpace(WORD ds, WORD countdiscard)
720 {
721 char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
722 LOCALHEAPINFO *pInfo;
723 LOCALARENA *pArena;
724 WORD arena;
725 WORD freespace = 0;
726
727 if (!(pInfo = LOCAL_GetHeap( ds )))
728 {
729 ERR("Local heap not found\n" );
730 LOCAL_PrintHeap(ds);
731 return 0;
732 }
733 arena = pInfo->first;
734 pArena = ARENA_PTR( ptr, arena );
735 while (arena != pArena->free_next)
736 {
737 arena = pArena->free_next;
738 pArena = ARENA_PTR( ptr, arena );
739 if (pArena->size >= freespace) freespace = pArena->size;
740 }
741 /* FIXME doesn't yet calculate space that would become free if everything
742 were discarded when countdiscard == 1 */
743 if (freespace < ARENA_HEADER_SIZE) freespace = 0;
744 else freespace -= ARENA_HEADER_SIZE;
745 return freespace;
746 }
747
748
749 /***********************************************************************
750 * LOCAL_Compact
751 */
752 static UINT16 LOCAL_Compact( HANDLE16 ds, UINT16 minfree, UINT16 flags )
753 {
754 char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
755 LOCALHEAPINFO *pInfo;
756 LOCALARENA *pArena, *pMoveArena, *pFinalArena;
757 WORD arena, movearena, finalarena, table;
758 WORD count, movesize, size;
759 WORD freespace;
760 LOCALHANDLEENTRY *pEntry;
761
762 if (!(pInfo = LOCAL_GetHeap( ds )))
763 {
764 ERR("Local heap not found\n" );
765 LOCAL_PrintHeap(ds);
766 return 0;
767 }
768 TRACE("ds = %04x, minfree = %04x, flags = %04x\n",
769 ds, minfree, flags);
770 freespace = LOCAL_GetFreeSpace(ds, minfree ? 0 : 1);
771 if(freespace >= minfree || (flags & LMEM_NOCOMPACT))
772 {
773 TRACE("Returning %04x.\n", freespace);
774 return freespace;
775 }
776 TRACE("Compacting heap %04x.\n", ds);
777 table = pInfo->htable;
778 while(table)
779 {
780 pEntry = (LOCALHANDLEENTRY *)(ptr + table + sizeof(WORD));
781 for(count = *(WORD *)(ptr + table); count > 0; count--, pEntry++)
782 {
783 if((pEntry->lock == 0) && (pEntry->flags != (LMEM_DISCARDED >> 8)))
784 {
785 /* OK we can move this one if we want */
786 TRACE("handle %04x (block %04x) can be moved.\n",
787 (WORD)((char *)pEntry - ptr), pEntry->addr);
788 movearena = ARENA_HEADER(pEntry->addr - MOVEABLE_PREFIX);
789 pMoveArena = ARENA_PTR(ptr, movearena);
790 movesize = pMoveArena->next - movearena;
791 arena = pInfo->first;
792 pArena = ARENA_PTR(ptr, arena);
793 size = 0xffff;
794 finalarena = 0;
795 /* Try to find the smallest arena that will do, */
796 /* which is below us in memory */
797 for(;;)
798 {
799 arena = pArena->free_next;
800 pArena = ARENA_PTR(ptr, arena);
801 if(arena >= movearena)
802 break;
803 if(arena == pArena->free_next)
804 break;
805 if((pArena->size >= movesize) && (pArena->size < size))
806 {
807 size = pArena->size;
808 finalarena = arena;
809 }
810 }
811 if (finalarena) /* Actually got somewhere to move */
812 {
813 TRACE("Moving it to %04x.\n", finalarena);
814 pFinalArena = ARENA_PTR(ptr, finalarena);
815 size = pFinalArena->size;
816 LOCAL_RemoveFreeBlock(ptr, finalarena);
817 LOCAL_ShrinkArena( ds, finalarena, movesize );
818 /* Copy the arena to it's new location */
819 memcpy((char *)pFinalArena + ARENA_HEADER_SIZE,
820 (char *)pMoveArena + ARENA_HEADER_SIZE,
821 movesize - ARENA_HEADER_SIZE );
822 /* Free the old location */
823 LOCAL_FreeArena(ds, movearena);
824 call_notify_func(pInfo->notify, LN_MOVE,
825 (WORD)((char *)pEntry - ptr), pEntry->addr);
826 /* Update handle table entry */
827 pEntry->addr = finalarena + ARENA_HEADER_SIZE + MOVEABLE_PREFIX;
828 }
829 else if((ARENA_PTR(ptr, pMoveArena->prev & ~3)->prev & 3)
830 == LOCAL_ARENA_FREE)
831 {
832 /* Previous arena is free (but < movesize) */
833 /* so we can 'slide' movearena down into it */
834 finalarena = pMoveArena->prev & ~3;
835 LOCAL_GrowArenaDownward( ds, movearena, movesize );
836 /* Update handle table entry */
837 pEntry->addr = finalarena + ARENA_HEADER_SIZE + MOVEABLE_PREFIX;
838 }
839 }
840 }
841 table = *(WORD *)pEntry;
842 }
843 freespace = LOCAL_GetFreeSpace(ds, minfree ? 0 : 1);
844 if(freespace >= minfree || (flags & LMEM_NODISCARD))
845 {
846 TRACE("Returning %04x.\n", freespace);
847 return freespace;
848 }
849
850 table = pInfo->htable;
851 while(table)
852 {
853 pEntry = (LOCALHANDLEENTRY *)(ptr + table + sizeof(WORD));
854 for(count = *(WORD *)(ptr + table); count > 0; count--, pEntry++)
855 {
856 if(pEntry->addr && pEntry->lock == 0 &&
857 (pEntry->flags & (LMEM_DISCARDABLE >> 8)))
858 {
859 TRACE("Discarding handle %04x (block %04x).\n",
860 (char *)pEntry - ptr, pEntry->addr);
861 LOCAL_FreeArena(ds, ARENA_HEADER(pEntry->addr - MOVEABLE_PREFIX));
862 call_notify_func(pInfo->notify, LN_DISCARD, (char *)pEntry - ptr, pEntry->flags);
863 pEntry->addr = 0;
864 pEntry->flags = (LMEM_DISCARDED >> 8);
865 }
866 }
867 table = *(WORD *)pEntry;
868 }
869 return LOCAL_Compact(ds, 0xffff, LMEM_NODISCARD);
870 }
871
872
873 /***********************************************************************
874 * LOCAL_FindFreeBlock
875 */
876 static HLOCAL16 LOCAL_FindFreeBlock( HANDLE16 ds, WORD size )
877 {
878 char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
879 LOCALHEAPINFO *pInfo;
880 LOCALARENA *pArena;
881 WORD arena;
882
883 if (!(pInfo = LOCAL_GetHeap( ds )))
884 {
885 ERR("Local heap not found\n" );
886 LOCAL_PrintHeap(ds);
887 return 0;
888 }
889
890 arena = pInfo->first;
891 pArena = ARENA_PTR( ptr, arena );
892 for (;;) {
893 arena = pArena->free_next;
894 pArena = ARENA_PTR( ptr, arena );
895 if (arena == pArena->free_next) break;
896 if (pArena->size >= size) return arena;
897 }
898 TRACE("not enough space\n" );
899 LOCAL_PrintHeap(ds);
900 return 0;
901 }
902
903
904 /***********************************************************************
905 * get_heap_name
906 */
907 static const char *get_heap_name( WORD ds )
908 {
909 HINSTANCE16 inst = LoadLibrary16( "GDI" );
910 if (ds == GlobalHandleToSel16( inst ))
911 {
912 FreeLibrary16( inst );
913 return "GDI";
914 }
915 FreeLibrary16( inst );
916 inst = LoadLibrary16( "USER" );
917 if (ds == GlobalHandleToSel16( inst ))
918 {
919 FreeLibrary16( inst );
920 return "USER";
921 }
922 FreeLibrary16( inst );
923 return "local";
924 }
925
926 /***********************************************************************
927 * LOCAL_GetBlock
928 * The segment may get moved around in this function, so all callers
929 * should reset their pointer variables.
930 */
931 static HLOCAL16 LOCAL_GetBlock( HANDLE16 ds, WORD size, WORD flags )
932 {
933 char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
934 LOCALHEAPINFO *pInfo;
935 LOCALARENA *pArena;
936 WORD arena;
937
938 if (!(pInfo = LOCAL_GetHeap( ds )))
939 {
940 ERR("Local heap not found\n");
941 LOCAL_PrintHeap(ds);
942 return 0;
943 }
944
945 size += ARENA_HEADER_SIZE;
946 size = LALIGN( max( size, sizeof(LOCALARENA) ) );
947
948 #if 0
949 notify_done:
950 #endif
951 /* Find a suitable free block */
952 arena = LOCAL_FindFreeBlock( ds, size );
953 if (arena == 0) {
954 /* no space: try to make some */
955 LOCAL_Compact( ds, size, flags );
956 arena = LOCAL_FindFreeBlock( ds, size );
957 }
958 if (arena == 0) {
959 /* still no space: try to grow the segment */
960 if (!(LOCAL_GrowHeap( ds )))
961 {
962 #if 0
963 /* FIXME: doesn't work correctly yet */
964 if (call_notify_func(pInfo->notify, LN_OUTOFMEM, ds - 20, size)) /* FIXME: "size" correct ? (should indicate bytes needed) */
965 goto notify_done;
966 #endif
967 ERR( "not enough space in %s heap %04x for %d bytes\n",
968 get_heap_name(ds), ds, size );
969 return 0;
970 }
971 ptr = MapSL( MAKESEGPTR( ds, 0 ) );
972 pInfo = LOCAL_GetHeap( ds );
973 arena = LOCAL_FindFreeBlock( ds, size );
974 }
975 if (arena == 0) {
976 ERR( "not enough space in %s heap %04x for %d bytes\n",
977 get_heap_name(ds), ds, size );
978 #if 0
979 /* FIXME: "size" correct ? (should indicate bytes needed) */
980 if (call_notify_func(pInfo->notify, LN_OUTOFMEM, ds, size)) goto notify_done;
981 #endif
982 return 0;
983 }
984
985 /* Make a block out of the free arena */
986 pArena = ARENA_PTR( ptr, arena );
987 TRACE("size = %04x, arena %04x size %04x\n", size, arena, pArena->size );
988 LOCAL_RemoveFreeBlock( ptr, arena );
989 LOCAL_ShrinkArena( ds, arena, size );
990
991 if (flags & LMEM_ZEROINIT)
992 memset((char *)pArena + ARENA_HEADER_SIZE, 0, size-ARENA_HEADER_SIZE);
993 return arena + ARENA_HEADER_SIZE;
994 }
995
996
997 /***********************************************************************
998 * LOCAL_NewHTable
999 */
1000 static BOOL16 LOCAL_NewHTable( HANDLE16 ds )
1001 {
1002 char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
1003 LOCALHEAPINFO *pInfo;
1004 LOCALHANDLEENTRY *pEntry;
1005 HLOCAL16 handle;
1006 int i;
1007
1008 TRACE("\n" );
1009 if (!(pInfo = LOCAL_GetHeap( ds )))
1010 {
1011 ERR("Local heap not found\n");
1012 LOCAL_PrintHeap(ds);
1013 return FALSE;
1014 }
1015
1016 if (!(handle = LOCAL_GetBlock( ds, pInfo->hdelta * sizeof(LOCALHANDLEENTRY)
1017 + 2 * sizeof(WORD), LMEM_FIXED )))
1018 return FALSE;
1019 if (!(ptr = MapSL( MAKESEGPTR( ds, 0 ) )))
1020 ERR("ptr == NULL after GetBlock.\n");
1021 if (!(pInfo = LOCAL_GetHeap( ds )))
1022 ERR("pInfo == NULL after GetBlock.\n");
1023
1024 /* Fill the entry table */
1025
1026 *(WORD *)(ptr + handle) = pInfo->hdelta;
1027 pEntry = (LOCALHANDLEENTRY *)(ptr + handle + sizeof(WORD));
1028 for (i = pInfo->hdelta; i > 0; i--, pEntry++) {
1029 pEntry->lock = pEntry->flags = 0xff;
1030 pEntry->addr = 0;
1031 }
1032 *(WORD *)pEntry = pInfo->htable;
1033 pInfo->htable = handle;
1034 return TRUE;
1035 }
1036
1037
1038 /***********************************************************************
1039 * LOCAL_GetNewHandleEntry
1040 */
1041 static HLOCAL16 LOCAL_GetNewHandleEntry( HANDLE16 ds )
1042 {
1043 char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
1044 LOCALHEAPINFO *pInfo;
1045 LOCALHANDLEENTRY *pEntry = NULL;
1046 WORD table;
1047
1048 if (!(pInfo = LOCAL_GetHeap( ds )))
1049 {
1050 ERR("Local heap not found\n");
1051 LOCAL_PrintHeap(ds);
1052 return 0;
1053 }
1054
1055 /* Find a free slot in existing tables */
1056
1057 table = pInfo->htable;
1058 while (table)
1059 {
1060 WORD count = *(WORD *)(ptr + table);
1061 pEntry = (LOCALHANDLEENTRY *)(ptr + table + sizeof(WORD));
1062 for (; count > 0; count--, pEntry++)
1063 if (pEntry->lock == 0xff) break;
1064 if (count) break;
1065 table = *(WORD *)pEntry;
1066 }
1067
1068 if (!table) /* We need to create a new table */
1069 {
1070 if (!LOCAL_NewHTable( ds )) return 0;
1071 ptr = MapSL( MAKESEGPTR( ds, 0 ) );
1072 pInfo = LOCAL_GetHeap( ds );
1073 pEntry = (LOCALHANDLEENTRY *)(ptr + pInfo->htable + sizeof(WORD));
1074 }
1075
1076 /* Now allocate this entry */
1077
1078 pEntry->lock = 0;
1079 pEntry->flags = 0;
1080 TRACE("(%04x): %04x\n", ds, ((char *)pEntry - ptr) );
1081 return (HLOCAL16)((char *)pEntry - ptr);
1082 }
1083
1084
1085 /***********************************************************************
1086 * LOCAL_FreeHandleEntry
1087 *
1088 * Free a handle table entry.
1089 */
1090 static void LOCAL_FreeHandleEntry( HANDLE16 ds, HLOCAL16 handle )
1091 {
1092 char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
1093 LOCALHANDLEENTRY *pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1094 LOCALHEAPINFO *pInfo;
1095 WORD *pTable;
1096 WORD table, count, i;
1097
1098 if (!(pInfo = LOCAL_GetHeap( ds ))) return;
1099
1100 /* Find the table where this handle comes from */
1101
1102 pTable = &pInfo->htable;
1103 while (*pTable)
1104 {
1105 WORD size = (*(WORD *)(ptr + *pTable)) * sizeof(LOCALHANDLEENTRY);
1106 if ((handle >= *pTable + sizeof(WORD)) &&
1107 (handle < *pTable + sizeof(WORD) + size)) break; /* Found it */
1108 pTable = (WORD *)(ptr + *pTable + sizeof(WORD) + size);
1109 }
1110 if (!*pTable)
1111 {
1112 ERR("Invalid entry %04x\n", handle);
1113 LOCAL_PrintHeap( ds );
1114 return;
1115 }
1116
1117 /* Make the entry free */
1118
1119 pEntry->addr = 0; /* just in case */
1120 pEntry->lock = 0xff;
1121 pEntry->flags = 0xff;
1122 /* Now check if all entries in this table are free */
1123
1124 table = *pTable;
1125 pEntry = (LOCALHANDLEENTRY *)(ptr + table + sizeof(WORD));
1126 count = *(WORD *)(ptr + table);
1127 for (i = count; i > 0; i--, pEntry++) if (pEntry->lock != 0xff) return;
1128
1129 /* Remove the table from the linked list and free it */
1130
1131 TRACE("(%04x): freeing table %04x\n", ds, table);
1132 *pTable = *(WORD *)pEntry;
1133 LOCAL_FreeArena( ds, ARENA_HEADER( table ) );
1134 }
1135
1136
1137 /***********************************************************************
1138 * LocalFree (KERNEL.7)
1139 */
1140 HLOCAL16 WINAPI LocalFree16( HLOCAL16 handle )
1141 {
1142 HANDLE16 ds = CURRENT_DS;
1143 char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
1144
1145 TRACE("%04x ds=%04x\n", handle, ds );
1146
1147 if (!handle) { WARN("Handle is 0.\n" ); return 0; }
1148 if (HANDLE_FIXED( handle ))
1149 {
1150 if (!LOCAL_FreeArena( ds, ARENA_HEADER( handle ) )) return 0; /* OK */
1151 else return handle; /* couldn't free it */
1152 }
1153 else
1154 {
1155 LOCALHANDLEENTRY *pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1156 if (pEntry->flags != (LMEM_DISCARDED >> 8))
1157 {
1158 TRACE("real block at %04x\n", pEntry->addr );
1159 if (LOCAL_FreeArena( ds, ARENA_HEADER(pEntry->addr - MOVEABLE_PREFIX) ))
1160 return handle; /* couldn't free it */
1161 }
1162 LOCAL_FreeHandleEntry( ds, handle );
1163 return 0; /* OK */
1164 }
1165 }
1166
1167
1168 /***********************************************************************
1169 * LocalAlloc (KERNEL.5)
1170 */
1171 HLOCAL16 WINAPI LocalAlloc16( UINT16 flags, WORD size )
1172 {
1173 HANDLE16 ds = CURRENT_DS;
1174 HLOCAL16 handle = 0;
1175 char *ptr;
1176
1177 TRACE("%04x %d ds=%04x\n", flags, size, ds );
1178
1179 if(size > 0 && size <= 4) size = 5;
1180 if (flags & LMEM_MOVEABLE)
1181 {
1182 LOCALHANDLEENTRY *plhe;
1183 HLOCAL16 hmem;
1184
1185 if(size)
1186 {
1187 if (!(hmem = LOCAL_GetBlock( ds, size + MOVEABLE_PREFIX, flags )))
1188 goto exit;
1189 }
1190 else /* We just need to allocate a discarded handle */
1191 hmem = 0;
1192 if (!(handle = LOCAL_GetNewHandleEntry( ds )))
1193 {
1194 WARN("Couldn't get handle.\n");
1195 if(hmem)
1196 LOCAL_FreeArena( ds, ARENA_HEADER(hmem) );
1197 goto exit;
1198 }
1199 ptr = MapSL( MAKESEGPTR( ds, 0 ) );
1200 plhe = (LOCALHANDLEENTRY *)(ptr + handle);
1201 plhe->lock = 0;
1202 if(hmem)
1203 {
1204 plhe->addr = hmem + MOVEABLE_PREFIX;
1205 plhe->flags = (BYTE)((flags & 0x0f00) >> 8);
1206 *(HLOCAL16 *)(ptr + hmem) = handle;
1207 }
1208 else
1209 {
1210 plhe->addr = 0;
1211 plhe->flags = LMEM_DISCARDED >> 8;
1212 }
1213 }
1214 else /* FIXED */
1215 {
1216 if(size) handle = LOCAL_GetBlock( ds, size, flags );
1217 }
1218
1219 exit:
1220 CURRENT_STACK16->ecx = handle; /* must be returned in cx too */
1221 return handle;
1222 }
1223
1224
1225 /***********************************************************************
1226 * LocalReAlloc (KERNEL.6)
1227 */
1228 HLOCAL16 WINAPI LocalReAlloc16( HLOCAL16 handle, WORD size, UINT16 flags )
1229 {
1230 HANDLE16 ds = CURRENT_DS;
1231 char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
1232 LOCALHEAPINFO *pInfo;
1233 LOCALARENA *pArena, *pNext;
1234 LOCALHANDLEENTRY *pEntry = NULL;
1235 WORD arena, oldsize;
1236 HLOCAL16 hmem, blockhandle;
1237 LONG nextarena;
1238
1239 if (!handle) return 0;
1240 if(HANDLE_MOVEABLE(handle) &&
1241 ((LOCALHANDLEENTRY *)(ptr + handle))->lock == 0xff) /* An unused handle */
1242 return 0;
1243
1244 TRACE("%04x %d %04x ds=%04x\n", handle, size, flags, ds );
1245 if (!(pInfo = LOCAL_GetHeap( ds ))) return 0;
1246
1247 if (HANDLE_FIXED( handle ))
1248 blockhandle = handle;
1249 else
1250 {
1251 pEntry = (LOCALHANDLEENTRY *) (ptr + handle);
1252 if(pEntry->flags == (LMEM_DISCARDED >> 8))
1253 {
1254 HLOCAL16 hl;
1255 if(pEntry->addr)
1256 WARN("Dicarded block has non-zero addr.\n");
1257 TRACE("ReAllocating discarded block\n");
1258 if(size <= 4) size = 5;
1259 if (!(hl = LOCAL_GetBlock( ds, size + MOVEABLE_PREFIX, flags)))
1260 return 0;
1261 ptr = MapSL( MAKESEGPTR( ds, 0 ) ); /* Reload ptr */
1262 pEntry = (LOCALHANDLEENTRY *) (ptr + handle);
1263 pEntry->addr = hl + MOVEABLE_PREFIX;
1264 pEntry->flags = 0;
1265 pEntry->lock = 0;
1266 *(HLOCAL16 *)(ptr + hl) = handle;
1267 return handle;
1268 }
1269 if (((blockhandle = pEntry->addr - MOVEABLE_PREFIX) & 3) != 0)
1270 {
1271 ERR("(%04x,%04x): invalid handle\n",
1272 ds, handle );
1273 return 0;
1274 }
1275 if (*(HLOCAL16 *)(ptr + blockhandle) != handle) {
1276 ERR("Back ptr to handle is invalid\n");
1277 return 0;
1278 }
1279 }
1280
1281 if (flags & LMEM_MODIFY)
1282 {
1283 if (HANDLE_MOVEABLE(handle))
1284 {
1285 pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1286 pEntry->flags = (flags & 0x0f00) >> 8;
1287 TRACE("Changing flags to %x.\n", pEntry->flags);
1288 }
1289 return handle;
1290 }
1291
1292 if (!size)
1293 {
1294 if (flags & LMEM_MOVEABLE)
1295 {
1296 if (HANDLE_FIXED(handle))
1297 {
1298 TRACE("Freeing fixed block.\n");
1299 return LocalFree16( handle );
1300 }
1301 else /* Moveable block */
1302 {
1303 pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1304 if (pEntry->lock == 0)
1305 {
1306 /* discards moveable blocks */
1307 TRACE("Discarding block\n");
1308 LOCAL_FreeArena(ds, ARENA_HEADER(pEntry->addr - MOVEABLE_PREFIX));
1309 pEntry->addr = 0;
1310 pEntry->flags = (LMEM_DISCARDED >> 8);
1311 return handle;
1312 }
1313 }
1314 return 0;
1315 }
1316 else if(flags == 0)
1317 {
1318 pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1319 if (pEntry->lock == 0)
1320 {
1321 /* Frees block */
1322 return LocalFree16( handle );
1323 }
1324 }
1325 return 0;
1326 }
1327
1328 arena = ARENA_HEADER( blockhandle );
1329 TRACE("arena is %04x\n", arena );
1330 pArena = ARENA_PTR( ptr, arena );
1331
1332 if(size <= 4) size = 5;
1333 if(HANDLE_MOVEABLE(handle)) size += MOVEABLE_PREFIX;
1334 oldsize = pArena->next - arena - ARENA_HEADER_SIZE;
1335 nextarena = LALIGN(blockhandle + size);
1336
1337 /* Check for size reduction */
1338
1339 if (nextarena <= pArena->next)
1340 {
1341 TRACE("size reduction, making new free block\n");
1342 LOCAL_ShrinkArena(ds, arena, nextarena - arena);
1343 TRACE("returning %04x\n", handle );
1344 return handle;
1345 }
1346
1347 /* Check if the next block is free and large enough */
1348
1349 pNext = ARENA_PTR( ptr, pArena->next );
1350 if (((pNext->prev & 3) == LOCAL_ARENA_FREE) &&
1351 (nextarena <= pNext->next))
1352 {
1353 TRACE("size increase, making new free block\n");
1354 LOCAL_GrowArenaUpward(ds, arena, nextarena - arena);
1355 if (flags & LMEM_ZEROINIT)
1356 {
1357 char *oldend = (char *)pArena + ARENA_HEADER_SIZE + oldsize;
1358 char *newend = ptr + pArena->next;
1359 TRACE("Clearing memory from %p to %p (DS -> %p)\n", oldend, newend, ptr);
1360 memset(oldend, 0, newend - oldend);
1361 }
1362
1363 TRACE("returning %04x\n", handle );
1364 return handle;
1365 }
1366
1367 /* Now we have to allocate a new block, but not if (fixed block or locked
1368 block) and no LMEM_MOVEABLE */
1369
1370 if (!(flags & LMEM_MOVEABLE))
1371 {
1372 if (HANDLE_FIXED(handle))
1373 {
1374 ERR("Needed to move fixed block, but LMEM_MOVEABLE not specified.\n");
1375 return 0;
1376 }
1377 else
1378 {
1379 if(((LOCALHANDLEENTRY *)(ptr + handle))->lock != 0)
1380 {
1381 ERR("Needed to move locked block, but LMEM_MOVEABLE not specified.\n");
1382 return 0;
1383 }
1384 }
1385 }
1386
1387 hmem = LOCAL_GetBlock( ds, size, flags );
1388 ptr = MapSL( MAKESEGPTR( ds, 0 )); /* Reload ptr */
1389 if(HANDLE_MOVEABLE(handle)) /* LOCAL_GetBlock might have triggered */
1390 { /* a compaction, which might in turn have */
1391 blockhandle = pEntry->addr - MOVEABLE_PREFIX; /* moved the very block we are resizing */
1392 arena = ARENA_HEADER( blockhandle ); /* thus, we reload arena, too */
1393 }
1394 if (!hmem)
1395 {
1396 /* Remove the block from the heap and try again */
1397 LPSTR buffer = HeapAlloc( GetProcessHeap(), 0, oldsize );
1398 if (!buffer) return 0;
1399 memcpy( buffer, ptr + arena + ARENA_HEADER_SIZE, oldsize );
1400 LOCAL_FreeArena( ds, arena );
1401 if (!(hmem = LOCAL_GetBlock( ds, size, flags )))
1402 {
1403 if (!(hmem = LOCAL_GetBlock( ds, oldsize, flags )))
1404 {
1405 ERR("Can't restore saved block\n" );
1406 HeapFree( GetProcessHeap(), 0, buffer );
1407 return 0;
1408 }
1409 size = oldsize;
1410 }
1411 ptr = MapSL( MAKESEGPTR( ds, 0 ) ); /* Reload ptr */
1412 memcpy( ptr + hmem, buffer, oldsize );
1413 HeapFree( GetProcessHeap(), 0, buffer );
1414 }
1415 else
1416 {
1417 memcpy( ptr + hmem, ptr + (arena + ARENA_HEADER_SIZE), oldsize );
1418 LOCAL_FreeArena( ds, arena );
1419 }
1420 if (HANDLE_MOVEABLE( handle ))
1421 {
1422 TRACE("fixing handle\n");
1423 pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1424 pEntry->addr = hmem + MOVEABLE_PREFIX;
1425 /* Back ptr should still be correct */
1426 if(*(HLOCAL16 *)(ptr + hmem) != handle)
1427 ERR("back ptr is invalid.\n");
1428 hmem = handle;
1429 }
1430 if (size == oldsize) hmem = 0; /* Realloc failed */
1431 TRACE("returning %04x\n", hmem );
1432 return hmem;
1433 }
1434
1435
1436 /***********************************************************************
1437 * LOCAL_InternalLock
1438 */
1439 static HLOCAL16 LOCAL_InternalLock( LPSTR heap, HLOCAL16 handle )
1440 {
1441 HLOCAL16 old_handle = handle;
1442
1443 if (HANDLE_MOVEABLE(handle))
1444 {
1445 LOCALHANDLEENTRY *pEntry = (LOCALHANDLEENTRY *)(heap + handle);
1446 if (pEntry->flags == (LMEM_DISCARDED >> 8)) return 0;
1447 if (pEntry->lock < 0xfe) pEntry->lock++;
1448 handle = pEntry->addr;
1449 }
1450 TRACE("%04x returning %04x\n", old_handle, handle );
1451 return handle;
1452 }
1453
1454
1455 /***********************************************************************
1456 * LocalUnlock (KERNEL.9)
1457 */
1458 BOOL16 WINAPI LocalUnlock16( HLOCAL16 handle )
1459 {
1460 HANDLE16 ds = CURRENT_DS;
1461 char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
1462
1463 TRACE("%04x\n", handle );
1464 if (HANDLE_MOVEABLE(handle))
1465 {
1466 LOCALHANDLEENTRY *pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1467 if (!pEntry->lock || (pEntry->lock == 0xff)) return FALSE;
1468 /* For moveable block, return the new lock count */
1469 /* (see _Windows_Internals_ p. 197) */
1470 return --pEntry->lock;
1471 }
1472 else return FALSE;
1473 }
1474
1475
1476 /***********************************************************************
1477 * LocalSize (KERNEL.10)
1478 */
1479 UINT16 WINAPI LocalSize16( HLOCAL16 handle )
1480 {
1481 HANDLE16 ds = CURRENT_DS;
1482 char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
1483 LOCALARENA *pArena;
1484
1485 TRACE("%04x ds=%04x\n", handle, ds );
1486
1487 if (!handle) return 0;
1488 if (HANDLE_MOVEABLE( handle ))
1489 {
1490 handle = *(WORD *)(ptr + handle);
1491 if (!handle) return 0;
1492 pArena = ARENA_PTR( ptr, ARENA_HEADER(handle - MOVEABLE_PREFIX) );
1493 }
1494 else
1495 pArena = ARENA_PTR( ptr, ARENA_HEADER(handle) );
1496
1497 return pArena->next - handle;
1498 }
1499
1500
1501 /***********************************************************************
1502 * LocalFlags (KERNEL.12)
1503 */
1504 UINT16 WINAPI LocalFlags16( HLOCAL16 handle )
1505 {
1506 HANDLE16 ds = CURRENT_DS;
1507 char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
1508
1509 if (HANDLE_MOVEABLE(handle))
1510 {
1511 LOCALHANDLEENTRY *pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1512 TRACE("(%04x,%04x): returning %04x\n",
1513 ds, handle, pEntry->lock | (pEntry->flags << 8) );
1514 return pEntry->lock | (pEntry->flags << 8);
1515 }
1516 else
1517 {
1518 TRACE("(%04x,%04x): returning 0\n",
1519 ds, handle );
1520 return 0;
1521 }
1522 }
1523
1524
1525 /***********************************************************************
1526 * LocalHeapSize (KERNEL.162)
1527 */
1528 WORD WINAPI LocalHeapSize16(void)
1529 {
1530 HANDLE16 ds = CURRENT_DS;
1531 LOCALHEAPINFO *pInfo = LOCAL_GetHeap( ds );
1532 return pInfo ? pInfo->last - pInfo->first : 0;
1533 }
1534
1535
1536 /***********************************************************************
1537 * LocalCountFree (KERNEL.161)
1538 */
1539 WORD WINAPI LocalCountFree16(void)
1540 {
1541 HANDLE16 ds = CURRENT_DS;
1542 WORD arena, total;
1543 LOCALARENA *pArena;
1544 LOCALHEAPINFO *pInfo;
1545 char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
1546
1547 if (!(pInfo = LOCAL_GetHeap( ds )))
1548 {
1549 ERR("(%04x): Local heap not found\n", ds );
1550 LOCAL_PrintHeap( ds );
1551 return 0;
1552 }
1553
1554 total = 0;
1555 arena = pInfo->first;
1556 pArena = ARENA_PTR( ptr, arena );
1557 for (;;)
1558 {
1559 arena = pArena->free_next;
1560 pArena = ARENA_PTR( ptr, arena );
1561 if (arena == pArena->free_next) break;
1562 total += pArena->size;
1563 }
1564 TRACE("(%04x): returning %d\n", ds, total);
1565 return total;
1566 }
1567
1568
1569 /***********************************************************************
1570 * LocalHandle (KERNEL.11)
1571 */
1572 HLOCAL16 WINAPI LocalHandle16( WORD addr )
1573 {
1574 HANDLE16 ds = CURRENT_DS;
1575 char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
1576 LOCALHEAPINFO *pInfo;
1577 WORD table;
1578
1579 if (!(pInfo = LOCAL_GetHeap( ds )))
1580 {
1581 ERR("(%04x): Local heap not found\n", ds );
1582 LOCAL_PrintHeap( ds );
1583 return 0;
1584 }
1585
1586 /* Find the address in the entry tables */
1587
1588 table = pInfo->htable;
1589 while (table)
1590 {
1591 WORD count = *(WORD *)(ptr + table);
1592 LOCALHANDLEENTRY *pEntry = (LOCALHANDLEENTRY*)(ptr+table+sizeof(WORD));
1593 for (; count > 0; count--, pEntry++)
1594 if (pEntry->addr == addr) return (HLOCAL16)((char *)pEntry - ptr);
1595 table = *(WORD *)pEntry;
1596 }
1597
1598 return (HLOCAL16)addr; /* Fixed block handle is addr */
1599 }
1600
1601
1602
1603
1604 /***********************************************************************
1605 * LocalLock (KERNEL.8)
1606 *
1607 * Note: only the offset part of the pointer is returned by the relay code.
1608 */
1609 SEGPTR WINAPI LocalLock16( HLOCAL16 handle )
1610 {
1611 WORD ds = CURRENT_DS;
1612 char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
1613 return MAKESEGPTR( ds, LOCAL_InternalLock( ptr, handle ) );
1614 }
1615
1616
1617 /***********************************************************************
1618 * LocalCompact (KERNEL.13)
1619 */
1620 UINT16 WINAPI LocalCompact16( UINT16 minfree )
1621 {
1622 TRACE("%04x\n", minfree );
1623 return LOCAL_Compact( CURRENT_DS, minfree, 0 );
1624 }
1625
1626
1627 /***********************************************************************
1628 * LocalNotify (KERNEL.14)
1629 *
1630 * Installs a callback function that is called for local memory events
1631 * Callback function prototype is
1632 * BOOL16 NotifyFunc(WORD wMsg, HLOCAL16 hMem, WORD wArg)
1633 * wMsg:
1634 * - LN_OUTOFMEM
1635 * NotifyFunc seems to be responsible for allocating some memory,
1636 * returns TRUE for success.
1637 * wArg = number of bytes needed additionally
1638 * - LN_MOVE
1639 * hMem = handle; wArg = old mem location
1640 * - LN_DISCARD
1641 * NotifyFunc seems to be strongly encouraged to return TRUE,
1642 * otherwise LogError() gets called.
1643 * hMem = handle; wArg = flags
1644 */
1645 FARPROC16 WINAPI LocalNotify16( FARPROC16 func )
1646 {
1647 LOCALHEAPINFO *pInfo;
1648 FARPROC16 oldNotify;
1649 HANDLE16 ds = CURRENT_DS;
1650
1651 if (!(pInfo = LOCAL_GetHeap( ds )))
1652 {
1653 ERR("(%04x): Local heap not found\n", ds );
1654 LOCAL_PrintHeap( ds );
1655 return 0;
1656 }
1657 TRACE("(%04x): %p\n", ds, func );
1658 FIXME("Half implemented\n");
1659 oldNotify = pInfo->notify;
1660 pInfo->notify = func;
1661 return oldNotify;
1662 }
1663
1664
1665 /***********************************************************************
1666 * LocalShrink (KERNEL.121)
1667 */
1668 UINT16 WINAPI LocalShrink16( HGLOBAL16 handle, UINT16 newsize )
1669 {
1670 TRACE("%04x %04x\n", handle, newsize );
1671 return 0;
1672 }
1673
1674
1675 /***********************************************************************
1676 * GetHeapSpaces (KERNEL.138)
1677 */
1678 DWORD WINAPI GetHeapSpaces16( HMODULE16 module )
1679 {
1680 NE_MODULE *pModule;
1681 WORD oldDS = CURRENT_DS;
1682 DWORD spaces;
1683
1684 if (!(pModule = NE_GetPtr( module ))) return 0;
1685 CURRENT_DS = GlobalHandleToSel16((NE_SEG_TABLE( pModule ) + pModule->ne_autodata - 1)->hSeg);
1686 spaces = MAKELONG( LocalCountFree16(), LocalHeapSize16() );
1687 CURRENT_DS = oldDS;
1688 return spaces;
1689 }
1690
1691
1692 /***********************************************************************
1693 * LocalHandleDelta (KERNEL.310)
1694 */
1695 WORD WINAPI LocalHandleDelta16( WORD delta )
1696 {
1697 LOCALHEAPINFO *pInfo;
1698
1699 if (!(pInfo = LOCAL_GetHeap( CURRENT_DS )))
1700 {
1701 ERR("Local heap not found\n");
1702 LOCAL_PrintHeap( CURRENT_DS );
1703 return 0;
1704 }
1705 if (delta) pInfo->hdelta = delta;
1706 TRACE("returning %04x\n", pInfo->hdelta);
1707 return pInfo->hdelta;
1708 }
1709
1710
1711 /***********************************************************************
1712 * 32-bit local heap functions (Win95; undocumented)
1713 */
1714
1715 /***********************************************************************
1716 * K208 (KERNEL.208)
1717 */
1718 HANDLE WINAPI Local32Init16( WORD segment, DWORD tableSize,
1719 DWORD heapSize, DWORD flags )
1720 {
1721 DWORD totSize, segSize = 0;
1722 LPBYTE base;
1723 LOCAL32HEADER *header;
1724 HANDLE heap;
1725 WORD *selectorTable;
1726 WORD selectorEven, selectorOdd;
1727 int i, nrBlocks;
1728
1729 /* Determine new heap size */
1730
1731 if ( segment )
1732 {
1733 if ( (segSize = GetSelectorLimit16( segment )) == 0 )
1734 return 0;
1735 else
1736 segSize++;
1737 }
1738
1739 if ( heapSize == (DWORD)-1 )
1740 heapSize = 1024*1024; /* FIXME */
1741
1742 heapSize = (heapSize + 0xffff) & 0xffff0000;
1743 segSize = (segSize + 0x0fff) & 0xfffff000;
1744 totSize = segSize + HTABLE_SIZE + heapSize;
1745
1746
1747 /* Allocate memory and initialize heap */
1748
1749 if ( !(base = VirtualAlloc( NULL, totSize, MEM_RESERVE, PAGE_READWRITE )) )
1750 return 0;
1751
1752 if ( !VirtualAlloc( base, segSize + HTABLE_PAGESIZE,
1753 MEM_COMMIT, PAGE_READWRITE ) )
1754 {
1755 VirtualFree( base, 0, MEM_RELEASE );
1756 return 0;
1757 }
1758
1759 if (!(heap = RtlCreateHeap( 0, base + segSize + HTABLE_SIZE, heapSize, 0x10000, NULL, NULL )))
1760 {
1761 VirtualFree( base, 0, MEM_RELEASE );
1762 return 0;
1763 }
1764
1765
1766 /* Set up header and handle table */
1767
1768 header = (LOCAL32HEADER *)(base + segSize);
1769 header->base = base;
1770 header->limit = HTABLE_PAGESIZE-1;
1771 header->flags = 0;
1772 header->magic = LOCAL32_MAGIC;
1773 header->heap = heap;
1774
1775 header->freeListFirst[0] = sizeof(LOCAL32HEADER);
1776 header->freeListLast[0] = HTABLE_PAGESIZE - 4;
1777 header->freeListSize[0] = (HTABLE_PAGESIZE - sizeof(LOCAL32HEADER)) / 4;
1778
1779 for (i = header->freeListFirst[0]; i < header->freeListLast[0]; i += 4)
1780 *(DWORD *)((LPBYTE)header + i) = i+4;
1781
1782 header->freeListFirst[1] = 0xffff;
1783
1784
1785 /* Set up selector table */
1786
1787 nrBlocks = (totSize + 0x7fff) >> 15;
1788 selectorTable = HeapAlloc( header->heap, 0, nrBlocks * 2 );
1789 selectorEven = SELECTOR_AllocBlock( base, totSize, WINE_LDT_FLAGS_DATA );
1790 selectorOdd = SELECTOR_AllocBlock( base + 0x8000, totSize - 0x8000, WINE_LDT_FLAGS_DATA );
1791 if ( !selectorTable || !selectorEven || !selectorOdd )
1792 {
1793 HeapFree( header->heap, 0, selectorTable );
1794 if ( selectorEven ) SELECTOR_FreeBlock( selectorEven );
1795 if ( selectorOdd ) SELECTOR_FreeBlock( selectorOdd );
1796 HeapDestroy( header->heap );
1797 VirtualFree( base, 0, MEM_RELEASE );
1798 return 0;
1799 }
1800
1801 header->selectorTableOffset = (LPBYTE)selectorTable - header->base;
1802 header->selectorTableSize = nrBlocks * 4; /* ??? Win95 does it this way! */
1803 header->selectorDelta = selectorEven - selectorOdd;
1804 header->segment = segment? segment : selectorEven;
1805
1806 for (i = 0; i < nrBlocks; i++)
1807 selectorTable[i] = (i & 1)? selectorOdd + ((i >> 1) << __AHSHIFT)
1808 : selectorEven + ((i >> 1) << __AHSHIFT);
1809
1810 /* Move old segment */
1811
1812 if ( segment )
1813 {
1814 /* FIXME: This is somewhat ugly and relies on implementation
1815 details about 16-bit global memory handles ... */
1816
1817 LPBYTE oldBase = (LPBYTE)GetSelectorBase( segment );
1818 memcpy( base, oldBase, segSize );
1819 GLOBAL_MoveBlock( segment, base, totSize );
1820 HeapFree( GetProcessHeap(), 0, oldBase );
1821 }
1822
1823 return header;
1824 }
1825
1826 /***********************************************************************
1827 * Local32_SearchHandle
1828 */
1829 static LPDWORD Local32_SearchHandle( LOCAL32HEADER *header, DWORD addr )
1830 {
1831 LPDWORD handle;
1832
1833 for ( handle = (LPDWORD)((LPBYTE)header + sizeof(LOCAL32HEADER));
1834 handle < (LPDWORD)((LPBYTE)header + header->limit);
1835 handle++)
1836 {
1837 if (*handle == addr)
1838 return handle;
1839 }
1840
1841 return NULL;
1842 }
1843
1844 /***********************************************************************
1845 * Local32_ToHandle
1846 */
1847 static VOID Local32_ToHandle( LOCAL32HEADER *header, INT16 type,
1848 DWORD addr, LPDWORD *handle, LPBYTE *ptr )
1849 {
1850 *handle = NULL;
1851 *ptr = NULL;
1852
1853 switch (type)
1854 {
1855 case -2: /* 16:16 pointer, no handles */
1856 *ptr = MapSL( addr );
1857 *handle = (LPDWORD)*ptr;
1858 break;
1859
1860 case -1: /* 32-bit offset, no handles */
1861 *ptr = header->base + addr;
1862 *handle = (LPDWORD)*ptr;
1863 break;
1864
1865 case 0: /* handle */
1866 if ( addr >= sizeof(LOCAL32HEADER)
1867 && addr < header->limit && !(addr & 3)
1868 && *(LPDWORD)((LPBYTE)header + addr) >= HTABLE_SIZE )
1869 {
1870 *handle = (LPDWORD)((LPBYTE)header + addr);
1871 *ptr = header->base + **handle;
1872 }
1873 break;
1874
1875 case 1: /* 16:16 pointer */
1876 *ptr = MapSL( addr );
1877 *handle = Local32_SearchHandle( header, *ptr - header->base );
1878 break;
1879
1880 case 2: /* 32-bit offset */
1881 *ptr = header->base + addr;
1882 *handle = Local32_SearchHandle( header, *ptr - header->base );
1883 break;
1884 }
1885 }
1886
1887 /***********************************************************************
1888 * Local32_FromHandle
1889 */
1890 static VOID Local32_FromHandle( LOCAL32HEADER *header, INT16 type,
1891 DWORD *addr, LPDWORD handle, LPBYTE ptr )
1892 {
1893 *addr = 0;
1894 switch (type)
1895 {
1896 case -2: /* 16:16 pointer */
1897 case 1:
1898 {
1899 WORD *selTable = (LPWORD)(header->base + header->selectorTableOffset);
1900 DWORD offset = ptr - header->base;
1901 *addr = MAKELONG( offset & 0x7fff, selTable[offset >> 15] );
1902 }
1903 break;
1904
1905 case -1: /* 32-bit offset */
1906 case 2:
1907 *addr = ptr - header->base;
1908 break;
1909
1910 case 0: /* handle */
1911 *addr = (LPBYTE)handle - (LPBYTE)header;
1912 break;
1913 }
1914 }
1915
1916 /***********************************************************************
1917 * K209 (KERNEL.209)
1918 */
1919 DWORD WINAPI Local32Alloc16( HANDLE heap, DWORD size, INT16 type, DWORD flags )
1920 {
1921 LOCAL32HEADER *header = heap;
1922 LPDWORD handle;
1923 LPBYTE ptr;
1924 DWORD addr;
1925
1926 /* Allocate memory */
1927 ptr = HeapAlloc( header->heap,
1928 (flags & LMEM_MOVEABLE)? HEAP_ZERO_MEMORY : 0, size );
1929 if (!ptr) return 0;
1930
1931
1932 /* Allocate handle if requested */
1933 if (type >= 0)
1934 {
1935 int page, i;
1936
1937 /* Find first page of handle table with free slots */
1938 for (page = 0; page < HTABLE_NPAGES; page++)
1939 if (header->freeListFirst[page] != 0)
1940 break;
1941 if (page == HTABLE_NPAGES)
1942 {
1943 WARN("Out of handles!\n" );
1944 HeapFree( header->heap, 0, ptr );
1945 return 0;
1946 }
1947
1948 /* If virgin page, initialize it */
1949 if (header->freeListFirst[page] == 0xffff)
1950 {
1951 if ( !VirtualAlloc( (LPBYTE)header + (page << 12),
1952 0x1000, MEM_COMMIT, PAGE_READWRITE ) )
1953 {
1954 WARN("Cannot grow handle table!\n" );
1955 HeapFree( header->heap, 0, ptr );
1956 return 0;
1957 }
1958
1959 header->limit += HTABLE_PAGESIZE;
1960
1961 header->freeListFirst[page] = 0;
1962 header->freeListLast[page] = HTABLE_PAGESIZE - 4;
1963 header->freeListSize[page] = HTABLE_PAGESIZE / 4;
1964
1965 for (i = 0; i < HTABLE_PAGESIZE; i += 4)
1966 *(DWORD *)((LPBYTE)header + i) = i+4;
1967
1968 if (page < HTABLE_NPAGES-1)
1969 header->freeListFirst[page+1] = 0xffff;
1970 }
1971
1972 /* Allocate handle slot from page */
1973 handle = (LPDWORD)((LPBYTE)header + header->freeListFirst[page]);
1974 if (--header->freeListSize[page] == 0)
1975 header->freeListFirst[page] = header->freeListLast[page] = 0;
1976 else
1977 header->freeListFirst[page] = *handle;
1978
1979 /* Store 32-bit offset in handle slot */
1980 *handle = ptr - header->base;
1981 }
1982 else
1983 {
1984 handle = (LPDWORD)ptr;
1985 header->flags |= 1;
1986 }
1987
1988
1989 /* Convert handle to requested output type */
1990 Local32_FromHandle( header, type, &addr, handle, ptr );
1991 return addr;
1992 }
1993
1994 /***********************************************************************
1995 * K210 (KERNEL.210)
1996 */
1997 DWORD WINAPI Local32ReAlloc16( HANDLE heap, DWORD addr, INT16 type,
1998 DWORD size, DWORD flags )
1999 {
2000 LOCAL32HEADER *header = heap;
2001 LPDWORD handle;
2002 LPBYTE ptr;
2003
2004 if (!addr)
2005 return Local32Alloc16( heap, size, type, flags );
2006
2007 /* Retrieve handle and pointer */
2008 Local32_ToHandle( header, type, addr, &handle, &ptr );
2009 if (!handle) return FALSE;
2010
2011 /* Reallocate memory block */
2012 ptr = HeapReAlloc( header->heap,
2013 (flags & LMEM_MOVEABLE)? HEAP_ZERO_MEMORY : 0,
2014 ptr, size );
2015 if (!ptr) return 0;
2016
2017 /* Modify handle */
2018 if (type >= 0)
2019 *handle = ptr - header->base;
2020 else
2021 handle = (LPDWORD)ptr;
2022
2023 /* Convert handle to requested output type */
2024 Local32_FromHandle( header, type, &addr, handle, ptr );
2025 return addr;
2026 }
2027
2028 /***********************************************************************
2029 * K211 (KERNEL.211)
2030 */
2031 BOOL WINAPI Local32Free16( HANDLE heap, DWORD addr, INT16 type )
2032 {
2033 LOCAL32HEADER *header = heap;
2034 LPDWORD handle;
2035 LPBYTE ptr;
2036
2037 /* Retrieve handle and pointer */
2038 Local32_ToHandle( header, type, addr, &handle, &ptr );
2039 if (!handle) return FALSE;
2040
2041 /* Free handle if necessary */
2042 if (type >= 0)
2043 {
2044 int offset = (LPBYTE)handle - (LPBYTE)header;
2045 int page = offset >> 12;
2046
2047 /* Return handle slot to page free list */
2048 if (header->freeListSize[page]++ == 0)
2049 header->freeListFirst[page] = header->freeListLast[page] = offset;
2050 else
2051 *(LPDWORD)((LPBYTE)header + header->freeListLast[page]) = offset,
2052 header->freeListLast[page] = offset;
2053
2054 *handle = 0;
2055
2056 /* Shrink handle table when possible */
2057 while (page > 0 && header->freeListSize[page] == HTABLE_PAGESIZE / 4)
2058 {
2059 if ( VirtualFree( (LPBYTE)header +
2060 (header->limit & ~(HTABLE_PAGESIZE-1)),
2061 HTABLE_PAGESIZE, MEM_DECOMMIT ) )
2062 break;
2063
2064 header->limit -= HTABLE_PAGESIZE;
2065 header->freeListFirst[page] = 0xffff;
2066 page--;
2067 }
2068 }
2069
2070 /* Free memory */
2071 return HeapFree( header->heap, 0, ptr );
2072 }
2073
2074 /***********************************************************************
2075 * K213 (KERNEL.213)
2076 */
2077 DWORD WINAPI Local32Translate16( HANDLE heap, DWORD addr, INT16 type1, INT16 type2 )
2078 {
2079 LOCAL32HEADER *header = heap;
2080 LPDWORD handle;
2081 LPBYTE ptr;
2082
2083 Local32_ToHandle( header, type1, addr, &handle, &ptr );
2084 if (!handle) return 0;
2085
2086 Local32_FromHandle( header, type2, &addr, handle, ptr );
2087 return addr;
2088 }
2089
2090 /***********************************************************************
2091 * K214 (KERNEL.214)
2092 */
2093 DWORD WINAPI Local32Size16( HANDLE heap, DWORD addr, INT16 type )
2094 {
2095 LOCAL32HEADER *header = heap;
2096 LPDWORD handle;
2097 LPBYTE ptr;
2098
2099 Local32_ToHandle( header, type, addr, &handle, &ptr );
2100 if (!handle) return 0;
2101
2102 return HeapSize( header->heap, 0, ptr );
2103 }
2104
2105 /***********************************************************************
2106 * K215 (KERNEL.215)
2107 */
2108 BOOL WINAPI Local32ValidHandle16( HANDLE heap, WORD addr )
2109 {
2110 LOCAL32HEADER *header = heap;
2111 LPDWORD handle;
2112 LPBYTE ptr;
2113
2114 Local32_ToHandle( header, 0, addr, &handle, &ptr );
2115 return handle != NULL;
2116 }
2117
2118 /***********************************************************************
2119 * K229 (KERNEL.229)
2120 */
2121 WORD WINAPI Local32GetSegment16( HANDLE heap )
2122 {
2123 LOCAL32HEADER *header = heap;
2124 return header->segment;
2125 }
2126
2127 /***********************************************************************
2128 * Local32_GetHeap
2129 */
2130 static LOCAL32HEADER *Local32_GetHeap( HGLOBAL16 handle )
2131 {
2132 WORD selector = GlobalHandleToSel16( handle );
2133 DWORD base = GetSelectorBase( selector );
2134 DWORD limit = GetSelectorLimit16( selector );
2135
2136 /* Hmmm. This is a somewhat stupid heuristic, but Windows 95 does
2137 it this way ... */
2138
2139 if ( limit > 0x10000 && ((LOCAL32HEADER *)base)->magic == LOCAL32_MAGIC )
2140 return (LOCAL32HEADER *)base;
2141
2142 base += 0x10000;
2143 limit -= 0x10000;
2144
2145 if ( limit > 0x10000 && ((LOCAL32HEADER *)base)->magic == LOCAL32_MAGIC )
2146 return (LOCAL32HEADER *)base;
2147
2148 return NULL;
2149 }
2150
2151 /***********************************************************************
2152 * Local32Info (KERNEL.444)
2153 */
2154 BOOL16 WINAPI Local32Info16( LOCAL32INFO *pLocal32Info, HGLOBAL16 handle )
2155 {
2156 PROCESS_HEAP_ENTRY entry;
2157 int i;
2158
2159 LOCAL32HEADER *header = Local32_GetHeap( handle );
2160 if ( !header ) return FALSE;
2161
2162 if ( !pLocal32Info || pLocal32Info->dwSize < sizeof(LOCAL32INFO) )
2163 return FALSE;
2164
2165 pLocal32Info->dwMemReserved = 0;
2166 pLocal32Info->dwMemCommitted = 0;
2167 pLocal32Info->dwTotalFree = 0;
2168 pLocal32Info->dwLargestFreeBlock = 0;
2169
2170 while (HeapWalk( header->heap, &entry ))
2171 {
2172 if (entry.wFlags & PROCESS_HEAP_REGION)
2173 {
2174 pLocal32Info->dwMemReserved += entry.u.Region.dwCommittedSize
2175 + entry.u.Region.dwUnCommittedSize;
2176 pLocal32Info->dwMemCommitted = entry.u.Region.dwCommittedSize;
2177 }
2178 else if (!(entry.wFlags & PROCESS_HEAP_ENTRY_BUSY))
2179 {
2180 DWORD size = entry.cbData + entry.cbOverhead;
2181 pLocal32Info->dwTotalFree += size;
2182 if (size > pLocal32Info->dwLargestFreeBlock) pLocal32Info->dwLargestFreeBlock = size;
2183 }
2184 }
2185
2186 pLocal32Info->dwcFreeHandles = 0;
2187 for ( i = 0; i < HTABLE_NPAGES; i++ )
2188 {
2189 if ( header->freeListFirst[i] == 0xffff ) break;
2190 pLocal32Info->dwcFreeHandles += header->freeListSize[i];
2191 }
2192 pLocal32Info->dwcFreeHandles += (HTABLE_NPAGES - i) * HTABLE_PAGESIZE/4;
2193
2194 return TRUE;
2195 }
2196
2197 /***********************************************************************
2198 * Local32First (KERNEL.445)
2199 */
2200 BOOL16 WINAPI Local32First16( LOCAL32ENTRY *pLocal32Entry, HGLOBAL16 handle )
2201 {
2202 FIXME("(%p, %04X): stub!\n", pLocal32Entry, handle );
2203 return FALSE;
2204 }
2205
2206 /***********************************************************************
2207 * Local32Next (KERNEL.446)
2208 */
2209 BOOL16 WINAPI Local32Next16( LOCAL32ENTRY *pLocal32Entry )
2210 {
2211 FIXME("(%p): stub!\n", pLocal32Entry );
2212 return FALSE;
2213 }
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