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push 27a9569132e9fc3a545aded7efca0a004a7b7ea9
[wine/hacks.git] / dlls / kernel32 / local16.c
blob76b2a6d7f95abf8228651764caf1f85811ec6b9e
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 "toolhelp.h"
39 #include "winternl.h"
40 #include "kernel_private.h"
41 #include "kernel16_private.h"
42 #include "wine/debug.h"
43
44 WINE_DEFAULT_DEBUG_CHANNEL(local);
45
46 typedef struct
47 {
48 /* Arena header */
49 WORD prev; /* Previous arena | arena type */
50 WORD next; /* Next arena */
51 /* Start of the memory block or free-list info */
52 WORD size; /* Size of the free block */
53 WORD free_prev; /* Previous free block */
54 WORD free_next; /* Next free block */
55 } LOCALARENA;
56
57 #define ARENA_HEADER_SIZE 4
58 #define ARENA_HEADER( handle) ((handle) - ARENA_HEADER_SIZE)
59
60 /* Arena types (stored in 'prev' field of the arena) */
61 #define LOCAL_ARENA_FREE 0
62 #define LOCAL_ARENA_FIXED 1
63
64 /* LocalNotify() msgs */
65
66 #define LN_OUTOFMEM 0
67 #define LN_MOVE 1
68 #define LN_DISCARD 2
69
70 /* Layout of a handle entry table
71 *
72 * WORD count of entries
73 * LOCALHANDLEENTRY[count] entries
74 * WORD near ptr to next table
75 */
76 typedef struct
77 {
78 WORD addr; /* Address of the MOVEABLE block */
79 BYTE flags; /* Flags for this block */
80 BYTE lock; /* Lock count */
81 } LOCALHANDLEENTRY;
82
83 /*
84 * We make addr = 4n + 2 and set *((WORD *)addr - 1) = &addr like Windows does
85 * in case something actually relies on this.
86 * Note that if the architecture does not allow unaligned accesses, we make
87 * addr = 4n + 4 to avoid returning unaligned pointers from LocalAlloc etc.
88 *
89 * An unused handle has lock = flags = 0xff. In windows addr is that of next
90 * free handle, at the moment in wine we set it to 0.
91 *
92 * A discarded block's handle has lock = addr = 0 and flags = 0x40
93 * (LMEM_DISCARDED >> 8)
94 */
95
96 #ifdef ALLOW_UNALIGNED_ACCESS
97 # define MOVEABLE_PREFIX sizeof(HLOCAL16)
98 #else
99 # define MOVEABLE_PREFIX sizeof(int)
100 #endif
101
102
103 #include "pshpack1.h"
104
105 typedef struct
106 {
107 WORD check; /* 00 Heap checking flag */
108 WORD freeze; /* 02 Heap frozen flag */
109 WORD items; /* 04 Count of items on the heap */
110 WORD first; /* 06 First item of the heap */
111 WORD pad1; /* 08 Always 0 */
112 WORD last; /* 0a Last item of the heap */
113 WORD pad2; /* 0c Always 0 */
114 BYTE ncompact; /* 0e Compactions counter */
115 BYTE dislevel; /* 0f Discard level */
116 DWORD distotal; /* 10 Total bytes discarded */
117 WORD htable; /* 14 Pointer to handle table */
118 WORD hfree; /* 16 Pointer to free handle table */
119 WORD hdelta; /* 18 Delta to expand the handle table */
120 WORD expand; /* 1a Pointer to expand function (unused) */
121 WORD pstat; /* 1c Pointer to status structure (unused) */
122 FARPROC16 notify; /* 1e Pointer to LocalNotify() function */
123 WORD lock; /* 22 Lock count for the heap */
124 WORD extra; /* 24 Extra bytes to allocate when expanding */
125 WORD minsize; /* 26 Minimum size of the heap */
126 WORD magic; /* 28 Magic number */
127 } LOCALHEAPINFO;
128
129 #include "poppack.h"
130
131 #define LOCAL_HEAP_MAGIC 0x484c /* 'LH' */
132
133 /* All local heap allocations are aligned on 4-byte boundaries */
134 #define LALIGN(word) (((word) + 3) & ~3)
135
136 #define ARENA_PTR(ptr,arena) ((LOCALARENA *)((char*)(ptr)+(arena)))
137 #define ARENA_PREV(ptr,arena) (ARENA_PTR((ptr),(arena))->prev & ~3)
138 #define ARENA_NEXT(ptr,arena) (ARENA_PTR((ptr),(arena))->next)
139 #define ARENA_FLAGS(ptr,arena) (ARENA_PTR((ptr),(arena))->prev & 3)
140
141 /* determine whether the handle belongs to a fixed or a moveable block */
142 #define HANDLE_FIXED(handle) (((handle) & 3) == 0)
143 #define HANDLE_MOVEABLE(handle) (((handle) & 3) == 2)
144
145
146 /* 32-bit heap definitions */
147
148 #define HTABLE_SIZE 0x10000
149 #define HTABLE_PAGESIZE 0x1000
150 #define HTABLE_NPAGES (HTABLE_SIZE / HTABLE_PAGESIZE)
151
152 #include "pshpack1.h"
153 typedef struct _LOCAL32HEADER
154 {
155 WORD freeListFirst[HTABLE_NPAGES];
156 WORD freeListSize[HTABLE_NPAGES];
157 WORD freeListLast[HTABLE_NPAGES];
158
159 DWORD selectorTableOffset;
160 WORD selectorTableSize;
161 WORD selectorDelta;
162
163 DWORD segment;
164 LPBYTE base;
165
166 DWORD limit;
167 DWORD flags;
168
169 DWORD magic;
170 HANDLE heap;
171
172 } LOCAL32HEADER;
173 #include "poppack.h"
174
175 #define LOCAL32_MAGIC ((DWORD)('L' | ('H'<<8) | ('3'<<16) | ('2'<<24)))
176
177
178 static inline BOOL16 call_notify_func( FARPROC16 proc, WORD msg, HLOCAL16 handle, WORD arg )
179 {
180 DWORD ret;
181 WORD args[3];
182
183 if (!proc) return FALSE;
184 args[2] = msg;
185 args[1] = handle;
186 args[0] = arg;
187 WOWCallback16Ex( (DWORD)proc, WCB16_PASCAL, sizeof(args), args, &ret );
188 return LOWORD(ret);
189 }
190
191
192 /***********************************************************************
193 * LOCAL_GetHeap
194 *
195 * Return a pointer to the local heap, making sure it exists.
196 */
197 static LOCALHEAPINFO *LOCAL_GetHeap( HANDLE16 ds )
198 {
199 LOCALHEAPINFO *pInfo;
200 INSTANCEDATA *ptr = MapSL( MAKESEGPTR( ds, 0 ));
201 TRACE("Heap at %p, %04x\n", ptr, (ptr != NULL ? ptr->heap : 0xFFFF));
202 if (!ptr || !ptr->heap) return NULL;
203 if (IsBadReadPtr16( (SEGPTR)MAKELONG(ptr->heap,ds), sizeof(LOCALHEAPINFO)))
204 {
205 WARN("Bad pointer\n");
206 return NULL;
207 }
208 pInfo = (LOCALHEAPINFO*)((char*)ptr + ptr->heap);
209 if (pInfo->magic != LOCAL_HEAP_MAGIC)
210 {
211 WARN("Bad magic\n");
212 return NULL;
213 }
214 return pInfo;
215 }
216
217
218 /***********************************************************************
219 * LOCAL_MakeBlockFree
220 *
221 * Make a block free, inserting it in the free-list.
222 * 'block' is the handle of the block arena; 'baseptr' points to
223 * the beginning of the data segment containing the heap.
224 */
225 static void LOCAL_MakeBlockFree( char *baseptr, WORD block )
226 {
227 LOCALARENA *pArena, *pNext;
228 WORD next;
229
230 /* Mark the block as free */
231
232 pArena = ARENA_PTR( baseptr, block );
233 pArena->prev = (pArena->prev & ~3) | LOCAL_ARENA_FREE;
234 pArena->size = pArena->next - block;
235
236 /* Find the next free block (last block is always free) */
237
238 next = pArena->next;
239 for (;;)
240 {
241 pNext = ARENA_PTR( baseptr, next );
242 if ((pNext->prev & 3) == LOCAL_ARENA_FREE) break;
243 next = pNext->next;
244 }
245
246 TRACE("%04x, next %04x\n", block, next );
247 /* Insert the free block in the free-list */
248
249 pArena->free_prev = pNext->free_prev;
250 pArena->free_next = next;
251 ARENA_PTR(baseptr,pNext->free_prev)->free_next = block;
252 pNext->free_prev = block;
253 }
254
255
256 /***********************************************************************
257 * LOCAL_RemoveFreeBlock
258 *
259 * Remove a block from the free-list.
260 * 'block' is the handle of the block arena; 'baseptr' points to
261 * the beginning of the data segment containing the heap.
262 */
263 static void LOCAL_RemoveFreeBlock( char *baseptr, WORD block )
264 {
265 /* Mark the block as fixed */
266
267 LOCALARENA *pArena = ARENA_PTR( baseptr, block );
268 pArena->prev = (pArena->prev & ~3) | LOCAL_ARENA_FIXED;
269
270 /* Remove it from the list */
271
272 ARENA_PTR(baseptr,pArena->free_prev)->free_next = pArena->free_next;
273 ARENA_PTR(baseptr,pArena->free_next)->free_prev = pArena->free_prev;
274 }
275
276
277 /***********************************************************************
278 * LOCAL_AddBlock
279 *
280 * Insert a new block in the heap.
281 * 'new' is the handle of the new block arena; 'baseptr' points to
282 * the beginning of the data segment containing the heap; 'prev' is
283 * the block before the new one.
284 */
285 static void LOCAL_AddBlock( char *baseptr, WORD prev, WORD new )
286 {
287 LOCALARENA *pPrev = ARENA_PTR( baseptr, prev );
288 LOCALARENA *pNew = ARENA_PTR( baseptr, new );
289
290 pNew->prev = (prev & ~3) | LOCAL_ARENA_FIXED;
291 pNew->next = pPrev->next;
292 ARENA_PTR(baseptr,pPrev->next)->prev &= 3;
293 ARENA_PTR(baseptr,pPrev->next)->prev |= new;
294 pPrev->next = new;
295 }
296
297
298 /***********************************************************************
299 * LOCAL_RemoveBlock
300 *
301 * Remove a block from the heap.
302 * 'block' is the handle of the block arena; 'baseptr' points to
303 * the beginning of the data segment containing the heap.
304 */
305 static void LOCAL_RemoveBlock( char *baseptr, WORD block )
306 {
307 LOCALARENA *pArena, *pTmp;
308
309 /* Remove the block from the free-list */
310
311 TRACE("\n");
312 pArena = ARENA_PTR( baseptr, block );
313 if ((pArena->prev & 3) == LOCAL_ARENA_FREE)
314 LOCAL_RemoveFreeBlock( baseptr, block );
315
316 /* If the previous block is free, expand its size */
317
318 pTmp = ARENA_PTR( baseptr, pArena->prev & ~3 );
319 if ((pTmp->prev & 3) == LOCAL_ARENA_FREE)
320 pTmp->size += pArena->next - block;
321
322 /* Remove the block from the linked list */
323
324 pTmp->next = pArena->next;
325 pTmp = ARENA_PTR( baseptr, pArena->next );
326 pTmp->prev = (pTmp->prev & 3) | (pArena->prev & ~3);
327 }
328
329
330 /***********************************************************************
331 * LOCAL_PrintHeap
332 */
333 static void LOCAL_PrintHeap( HANDLE16 ds )
334 {
335 char *ptr;
336 LOCALHEAPINFO *pInfo;
337 WORD arena;
338
339 /* FIXME - the test should be done when calling the function!
340 plus is not clear that we should print this info
341 only when TRACE_ON is on! */
342 if(!TRACE_ON(local)) return;
343
344 ptr = MapSL( MAKESEGPTR( ds, 0 ));
345 pInfo = LOCAL_GetHeap( ds );
346
347 if (!pInfo)
348 {
349 ERR( "Local Heap corrupted! ds=%04x\n", ds );
350 return;
351 }
352 TRACE( "Local Heap ds=%04x first=%04x last=%04x items=%d\n",
353 ds, pInfo->first, pInfo->last, pInfo->items );
354
355 arena = pInfo->first;
356 for (;;)
357 {
358 LOCALARENA *pArena = ARENA_PTR(ptr,arena);
359 TRACE( " %04x: prev=%04x next=%04x type=%d\n", arena,
360 pArena->prev & ~3, pArena->next, pArena->prev & 3 );
361 if (arena == pInfo->first)
362 {
363 TRACE( " size=%d free_prev=%04x free_next=%04x\n",
364 pArena->size, pArena->free_prev, pArena->free_next );
365 }
366 if ((pArena->prev & 3) == LOCAL_ARENA_FREE)
367 {
368 TRACE( " size=%d free_prev=%04x free_next=%04x\n",
369 pArena->size, pArena->free_prev, pArena->free_next );
370 if (pArena->next == arena) break; /* last one */
371 if (ARENA_PTR(ptr,pArena->free_next)->free_prev != arena)
372 {
373 TRACE( "*** arena->free_next->free_prev != arena\n" );
374 break;
375 }
376 }
377 if (pArena->next == arena)
378 {
379 TRACE( "*** last block is not marked free\n" );
380 break;
381 }
382 if ((ARENA_PTR(ptr,pArena->next)->prev & ~3) != arena)
383 {
384 TRACE( "*** arena->next->prev != arena (%04x, %04x)\n",
385 pArena->next, ARENA_PTR(ptr,pArena->next)->prev);
386 break;
387 }
388 arena = pArena->next;
389 }
390 }
391
392
393 /***********************************************************************
394 * LocalInit (KERNEL.4)
395 */
396 BOOL16 WINAPI LocalInit16( HANDLE16 selector, WORD start, WORD end )
397 {
398 char *ptr;
399 WORD heapInfoArena, freeArena, lastArena;
400 LOCALHEAPINFO *pHeapInfo;
401 LOCALARENA *pArena, *pFirstArena, *pLastArena;
402 BOOL16 ret = FALSE;
403
404 /* The initial layout of the heap is: */
405 /* - first arena (FIXED) */
406 /* - heap info structure (FIXED) */
407 /* - large free block (FREE) */
408 /* - last arena (FREE) */
409
410 TRACE("%04x %04x-%04x\n", selector, start, end);
411 if (!selector) selector = CURRENT_DS;
412
413 if (TRACE_ON(local))
414 {
415 /* If TRACE_ON(heap) is set, the global heap blocks are */
416 /* cleared before use, so we can test for double initialization. */
417 if (LOCAL_GetHeap(selector))
418 {
419 ERR("Heap %04x initialized twice.\n", selector);
420 LOCAL_PrintHeap(selector);
421 }
422 }
423
424 if (start == 0)
425 {
426 /* start == 0 means: put the local heap at the end of the segment */
427
428 DWORD size = GlobalSize16( GlobalHandle16( selector ) );
429 start = (WORD)(size > 0xffff ? 0xffff : size) - 1;
430 if ( end > 0xfffe ) end = 0xfffe;
431 start -= end;
432 end += start;
433 }
434 ptr = MapSL( MAKESEGPTR( selector, 0 ) );
435
436 start = LALIGN( max( start, sizeof(INSTANCEDATA) ) );
437 heapInfoArena = LALIGN(start + sizeof(LOCALARENA) );
438 freeArena = LALIGN( heapInfoArena + ARENA_HEADER_SIZE
439 + sizeof(LOCALHEAPINFO) );
440 lastArena = (end - sizeof(LOCALARENA)) & ~3;
441
442 /* Make sure there's enough space. */
443
444 if (freeArena + sizeof(LOCALARENA) >= lastArena) goto done;
445
446 /* Initialise the first arena */
447
448 pFirstArena = ARENA_PTR( ptr, start );
449 pFirstArena->prev = start | LOCAL_ARENA_FIXED;
450 pFirstArena->next = heapInfoArena;
451 pFirstArena->size = LALIGN(sizeof(LOCALARENA));
452 pFirstArena->free_prev = start; /* this one */
453 pFirstArena->free_next = freeArena;
454
455 /* Initialise the arena of the heap info structure */
456
457 pArena = ARENA_PTR( ptr, heapInfoArena );
458 pArena->prev = start | LOCAL_ARENA_FIXED;
459 pArena->next = freeArena;
460
461 /* Initialise the heap info structure */
462
463 pHeapInfo = (LOCALHEAPINFO *) (ptr + heapInfoArena + ARENA_HEADER_SIZE );
464 memset( pHeapInfo, 0, sizeof(LOCALHEAPINFO) );
465 pHeapInfo->items = 4;
466 pHeapInfo->first = start;
467 pHeapInfo->last = lastArena;
468 pHeapInfo->htable = 0;
469 pHeapInfo->hdelta = 0x20;
470 pHeapInfo->extra = 0x200;
471 pHeapInfo->minsize = lastArena - freeArena;
472 pHeapInfo->magic = LOCAL_HEAP_MAGIC;
473
474 /* Initialise the large free block */
475
476 pArena = ARENA_PTR( ptr, freeArena );
477 pArena->prev = heapInfoArena | LOCAL_ARENA_FREE;
478 pArena->next = lastArena;
479 pArena->size = lastArena - freeArena;
480 pArena->free_prev = start;
481 pArena->free_next = lastArena;
482
483 /* Initialise the last block */
484
485 pLastArena = ARENA_PTR( ptr, lastArena );
486 pLastArena->prev = freeArena | LOCAL_ARENA_FREE;
487 pLastArena->next = lastArena; /* this one */
488 pLastArena->size = LALIGN(sizeof(LOCALARENA));
489 pLastArena->free_prev = freeArena;
490 pLastArena->free_next = lastArena; /* this one */
491
492 /* Store the local heap address in the instance data */
493
494 ((INSTANCEDATA *)ptr)->heap = heapInfoArena + ARENA_HEADER_SIZE;
495 LOCAL_PrintHeap( selector );
496 ret = TRUE;
497
498 done:
499 CURRENT_STACK16->ecx = ret; /* must be returned in cx too */
500 return ret;
501 }
502
503
504 /***********************************************************************
505 * LOCAL_GrowHeap
506 */
507 static BOOL16 LOCAL_GrowHeap( HANDLE16 ds )
508 {
509 HANDLE16 hseg;
510 LONG oldsize;
511 LONG end;
512 LOCALHEAPINFO *pHeapInfo;
513 WORD freeArena, lastArena;
514 LOCALARENA *pArena, *pLastArena;
515 char *ptr;
516
517 hseg = GlobalHandle16( ds );
518 /* maybe mem allocated by Virtual*() ? */
519 if (!hseg) return FALSE;
520
521 oldsize = GlobalSize16( hseg );
522 /* if nothing can be gained, return */
523 if (oldsize > 0xfff0) return FALSE;
524 hseg = GlobalReAlloc16( hseg, 0x10000, GMEM_FIXED );
525 ptr = MapSL( MAKESEGPTR( ds, 0 ) );
526 pHeapInfo = LOCAL_GetHeap( ds );
527 if (pHeapInfo == NULL) {
528 ERR("Heap not found\n" );
529 return FALSE;
530 }
531 end = GlobalSize16( hseg );
532 lastArena = (end - sizeof(LOCALARENA)) & ~3;
533
534 /* Update the HeapInfo */
535 pHeapInfo->items++;
536 freeArena = pHeapInfo->last;
537 pHeapInfo->last = lastArena;
538 pHeapInfo->minsize += end - oldsize;
539
540 /* grow the old last block */
541 pArena = ARENA_PTR( ptr, freeArena );
542 pArena->size = lastArena - freeArena;
543 pArena->next = lastArena;
544 pArena->free_next = lastArena;
545
546 /* Initialise the new last block */
547
548 pLastArena = ARENA_PTR( ptr, lastArena );
549 pLastArena->prev = freeArena | LOCAL_ARENA_FREE;
550 pLastArena->next = lastArena; /* this one */
551 pLastArena->size = LALIGN(sizeof(LOCALARENA));
552 pLastArena->free_prev = freeArena;
553 pLastArena->free_next = lastArena; /* this one */
554
555 /* If block before freeArena is also free then merge them */
556 if((ARENA_PTR(ptr, (pArena->prev & ~3))->prev & 3) == LOCAL_ARENA_FREE)
557 {
558 LOCAL_RemoveBlock(ptr, freeArena);
559 pHeapInfo->items--;
560 }
561
562 TRACE("Heap expanded\n" );
563 LOCAL_PrintHeap( ds );
564 return TRUE;
565 }
566
567
568 /***********************************************************************
569 * LOCAL_FreeArena
570 */
571 static HLOCAL16 LOCAL_FreeArena( WORD ds, WORD arena )
572 {
573 char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
574 LOCALHEAPINFO *pInfo;
575 LOCALARENA *pArena, *pPrev, *pNext;
576
577 TRACE("%04x ds=%04x\n", arena, ds );
578 if (!(pInfo = LOCAL_GetHeap( ds ))) return arena;
579
580 pArena = ARENA_PTR( ptr, arena );
581 if ((pArena->prev & 3) == LOCAL_ARENA_FREE)
582 {
583 /* shouldn't happen */
584 ERR("Trying to free block %04x twice!\n",
585 arena );
586 LOCAL_PrintHeap( ds );
587 return arena;
588 }
589
590 /* Check if we can merge with the previous block */
591
592 pPrev = ARENA_PTR( ptr, pArena->prev & ~3 );
593 pNext = ARENA_PTR( ptr, pArena->next );
594 if ((pPrev->prev & 3) == LOCAL_ARENA_FREE)
595 {
596 arena = pArena->prev & ~3;
597 pArena = pPrev;
598 LOCAL_RemoveBlock( ptr, pPrev->next );
599 pInfo->items--;
600 }
601 else /* Make a new free block */
602 {
603 LOCAL_MakeBlockFree( ptr, arena );
604 }
605
606 /* Check if we can merge with the next block */
607
608 if ((pArena->next == pArena->free_next) &&
609 (pArena->next != pInfo->last))
610 {
611 LOCAL_RemoveBlock( ptr, pArena->next );
612 pInfo->items--;
613 }
614 return 0;
615 }
616
617
618 /***********************************************************************
619 * LOCAL_ShrinkArena
620 *
621 * Shrink an arena by creating a free block at its end if possible.
622 * 'size' includes the arena header, and must be aligned.
623 */
624 static void LOCAL_ShrinkArena( WORD ds, WORD arena, WORD size )
625 {
626 char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
627 LOCALARENA *pArena = ARENA_PTR( ptr, arena );
628
629 if (arena + size + LALIGN(sizeof(LOCALARENA)) < pArena->next)
630 {
631 LOCALHEAPINFO *pInfo = LOCAL_GetHeap( ds );
632 if (!pInfo) return;
633 LOCAL_AddBlock( ptr, arena, arena + size );
634 pInfo->items++;
635 LOCAL_FreeArena( ds, arena + size );
636 }
637 }
638
639
640 /***********************************************************************
641 * LOCAL_GrowArenaDownward
642 *
643 * Grow an arena downward by using the previous arena (must be free).
644 */
645 static void LOCAL_GrowArenaDownward( WORD ds, WORD arena, WORD newsize )
646 {
647 char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
648 LOCALHEAPINFO *pInfo;
649 LOCALARENA *pArena = ARENA_PTR( ptr, arena );
650 WORD prevArena = pArena->prev & ~3;
651 LOCALARENA *pPrevArena = ARENA_PTR( ptr, prevArena );
652 WORD offset, size;
653 char *p;
654
655 if (!(pInfo = LOCAL_GetHeap( ds ))) return;
656 offset = pPrevArena->size;
657 size = pArena->next - arena - ARENA_HEADER_SIZE;
658 LOCAL_RemoveFreeBlock( ptr, prevArena );
659 LOCAL_RemoveBlock( ptr, arena );
660 pInfo->items--;
661 p = (char *)pPrevArena + ARENA_HEADER_SIZE;
662 while (offset < size)
663 {
664 memcpy( p, p + offset, offset );
665 p += offset;
666 size -= offset;
667 }
668 if (size) memcpy( p, p + offset, size );
669 LOCAL_ShrinkArena( ds, prevArena, newsize );
670 }
671
672
673
674 /***********************************************************************
675 * LOCAL_GrowArenaUpward
676 *
677 * Grow an arena upward by using the next arena (must be free and big
678 * enough). Newsize includes the arena header and must be aligned.
679 */
680 static void LOCAL_GrowArenaUpward( WORD ds, WORD arena, WORD newsize )
681 {
682 char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
683 LOCALHEAPINFO *pInfo;
684 LOCALARENA *pArena = ARENA_PTR( ptr, arena );
685 WORD nextArena = pArena->next;
686
687 if (!(pInfo = LOCAL_GetHeap( ds ))) return;
688 LOCAL_RemoveBlock( ptr, nextArena );
689 pInfo->items--;
690 LOCAL_ShrinkArena( ds, arena, newsize );
691 }
692
693
694 /***********************************************************************
695 * LOCAL_GetFreeSpace
696 */
697 static WORD LOCAL_GetFreeSpace(WORD ds, WORD countdiscard)
698 {
699 char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
700 LOCALHEAPINFO *pInfo;
701 LOCALARENA *pArena;
702 WORD arena;
703 WORD freespace = 0;
704
705 if (!(pInfo = LOCAL_GetHeap( ds )))
706 {
707 ERR("Local heap not found\n" );
708 LOCAL_PrintHeap(ds);
709 return 0;
710 }
711 arena = pInfo->first;
712 pArena = ARENA_PTR( ptr, arena );
713 while (arena != pArena->free_next)
714 {
715 arena = pArena->free_next;
716 pArena = ARENA_PTR( ptr, arena );
717 if (pArena->size >= freespace) freespace = pArena->size;
718 }
719 /* FIXME doesn't yet calculate space that would become free if everything
720 were discarded when countdiscard == 1 */
721 if (freespace < ARENA_HEADER_SIZE) freespace = 0;
722 else freespace -= ARENA_HEADER_SIZE;
723 return freespace;
724 }
725
726
727 /***********************************************************************
728 * LOCAL_Compact
729 */
730 static UINT16 LOCAL_Compact( HANDLE16 ds, UINT16 minfree, UINT16 flags )
731 {
732 char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
733 LOCALHEAPINFO *pInfo;
734 LOCALARENA *pArena, *pMoveArena, *pFinalArena;
735 WORD arena, movearena, finalarena, table;
736 WORD count, movesize, size;
737 WORD freespace;
738 LOCALHANDLEENTRY *pEntry;
739
740 if (!(pInfo = LOCAL_GetHeap( ds )))
741 {
742 ERR("Local heap not found\n" );
743 LOCAL_PrintHeap(ds);
744 return 0;
745 }
746 TRACE("ds = %04x, minfree = %04x, flags = %04x\n",
747 ds, minfree, flags);
748 freespace = LOCAL_GetFreeSpace(ds, minfree ? 0 : 1);
749 if(freespace >= minfree || (flags & LMEM_NOCOMPACT))
750 {
751 TRACE("Returning %04x.\n", freespace);
752 return freespace;
753 }
754 TRACE("Compacting heap %04x.\n", ds);
755 table = pInfo->htable;
756 while(table)
757 {
758 pEntry = (LOCALHANDLEENTRY *)(ptr + table + sizeof(WORD));
759 for(count = *(WORD *)(ptr + table); count > 0; count--, pEntry++)
760 {
761 if((pEntry->lock == 0) && (pEntry->flags != (LMEM_DISCARDED >> 8)))
762 {
763 /* OK we can move this one if we want */
764 TRACE("handle %04x (block %04x) can be moved.\n",
765 (WORD)((char *)pEntry - ptr), pEntry->addr);
766 movearena = ARENA_HEADER(pEntry->addr - MOVEABLE_PREFIX);
767 pMoveArena = ARENA_PTR(ptr, movearena);
768 movesize = pMoveArena->next - movearena;
769 arena = pInfo->first;
770 pArena = ARENA_PTR(ptr, arena);
771 size = 0xffff;
772 finalarena = 0;
773 /* Try to find the smallest arena that will do, */
774 /* which is below us in memory */
775 for(;;)
776 {
777 arena = pArena->free_next;
778 pArena = ARENA_PTR(ptr, arena);
779 if(arena >= movearena)
780 break;
781 if(arena == pArena->free_next)
782 break;
783 if((pArena->size >= movesize) && (pArena->size < size))
784 {
785 size = pArena->size;
786 finalarena = arena;
787 }
788 }
789 if (finalarena) /* Actually got somewhere to move */
790 {
791 TRACE("Moving it to %04x.\n", finalarena);
792 pFinalArena = ARENA_PTR(ptr, finalarena);
793 size = pFinalArena->size;
794 LOCAL_RemoveFreeBlock(ptr, finalarena);
795 LOCAL_ShrinkArena( ds, finalarena, movesize );
796 /* Copy the arena to it's new location */
797 memcpy((char *)pFinalArena + ARENA_HEADER_SIZE,
798 (char *)pMoveArena + ARENA_HEADER_SIZE,
799 movesize - ARENA_HEADER_SIZE );
800 /* Free the old location */
801 LOCAL_FreeArena(ds, movearena);
802 call_notify_func(pInfo->notify, LN_MOVE,
803 (WORD)((char *)pEntry - ptr), pEntry->addr);
804 /* Update handle table entry */
805 pEntry->addr = finalarena + ARENA_HEADER_SIZE + MOVEABLE_PREFIX;
806 }
807 else if((ARENA_PTR(ptr, pMoveArena->prev & ~3)->prev & 3)
808 == LOCAL_ARENA_FREE)
809 {
810 /* Previous arena is free (but < movesize) */
811 /* so we can 'slide' movearena down into it */
812 finalarena = pMoveArena->prev & ~3;
813 LOCAL_GrowArenaDownward( ds, movearena, movesize );
814 /* Update handle table entry */
815 pEntry->addr = finalarena + ARENA_HEADER_SIZE + MOVEABLE_PREFIX;
816 }
817 }
818 }
819 table = *(WORD *)pEntry;
820 }
821 freespace = LOCAL_GetFreeSpace(ds, minfree ? 0 : 1);
822 if(freespace >= minfree || (flags & LMEM_NODISCARD))
823 {
824 TRACE("Returning %04x.\n", freespace);
825 return freespace;
826 }
827
828 table = pInfo->htable;
829 while(table)
830 {
831 pEntry = (LOCALHANDLEENTRY *)(ptr + table + sizeof(WORD));
832 for(count = *(WORD *)(ptr + table); count > 0; count--, pEntry++)
833 {
834 if(pEntry->addr && pEntry->lock == 0 &&
835 (pEntry->flags & (LMEM_DISCARDABLE >> 8)))
836 {
837 TRACE("Discarding handle %04x (block %04x).\n",
838 (char *)pEntry - ptr, pEntry->addr);
839 LOCAL_FreeArena(ds, ARENA_HEADER(pEntry->addr - MOVEABLE_PREFIX));
840 call_notify_func(pInfo->notify, LN_DISCARD, (char *)pEntry - ptr, pEntry->flags);
841 pEntry->addr = 0;
842 pEntry->flags = (LMEM_DISCARDED >> 8);
843 }
844 }
845 table = *(WORD *)pEntry;
846 }
847 return LOCAL_Compact(ds, 0xffff, LMEM_NODISCARD);
848 }
849
850
851 /***********************************************************************
852 * LOCAL_FindFreeBlock
853 */
854 static HLOCAL16 LOCAL_FindFreeBlock( HANDLE16 ds, WORD size )
855 {
856 char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
857 LOCALHEAPINFO *pInfo;
858 LOCALARENA *pArena;
859 WORD arena;
860
861 if (!(pInfo = LOCAL_GetHeap( ds )))
862 {
863 ERR("Local heap not found\n" );
864 LOCAL_PrintHeap(ds);
865 return 0;
866 }
867
868 arena = pInfo->first;
869 pArena = ARENA_PTR( ptr, arena );
870 for (;;) {
871 arena = pArena->free_next;
872 pArena = ARENA_PTR( ptr, arena );
873 if (arena == pArena->free_next) break;
874 if (pArena->size >= size) return arena;
875 }
876 TRACE("not enough space\n" );
877 LOCAL_PrintHeap(ds);
878 return 0;
879 }
880
881
882 /***********************************************************************
883 * get_heap_name
884 */
885 static const char *get_heap_name( WORD ds )
886 {
887 HINSTANCE16 inst = LoadLibrary16( "GDI" );
888 if (ds == GlobalHandleToSel16( inst ))
889 {
890 FreeLibrary16( inst );
891 return "GDI";
892 }
893 FreeLibrary16( inst );
894 inst = LoadLibrary16( "USER" );
895 if (ds == GlobalHandleToSel16( inst ))
896 {
897 FreeLibrary16( inst );
898 return "USER";
899 }
900 FreeLibrary16( inst );
901 return "local";
902 }
903
904 /***********************************************************************
905 * LOCAL_GetBlock
906 * The segment may get moved around in this function, so all callers
907 * should reset their pointer variables.
908 */
909 static HLOCAL16 LOCAL_GetBlock( HANDLE16 ds, WORD size, WORD flags )
910 {
911 char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
912 LOCALHEAPINFO *pInfo;
913 LOCALARENA *pArena;
914 WORD arena;
915
916 if (!(pInfo = LOCAL_GetHeap( ds )))
917 {
918 ERR("Local heap not found\n");
919 LOCAL_PrintHeap(ds);
920 return 0;
921 }
922
923 size += ARENA_HEADER_SIZE;
924 size = LALIGN( max( size, sizeof(LOCALARENA) ) );
925
926 #if 0
927 notify_done:
928 #endif
929 /* Find a suitable free block */
930 arena = LOCAL_FindFreeBlock( ds, size );
931 if (arena == 0) {
932 /* no space: try to make some */
933 LOCAL_Compact( ds, size, flags );
934 arena = LOCAL_FindFreeBlock( ds, size );
935 }
936 if (arena == 0) {
937 /* still no space: try to grow the segment */
938 if (!(LOCAL_GrowHeap( ds )))
939 {
940 #if 0
941 /* FIXME: doesn't work correctly yet */
942 if (call_notify_func(pInfo->notify, LN_OUTOFMEM, ds - 20, size)) /* FIXME: "size" correct ? (should indicate bytes needed) */
943 goto notify_done;
944 #endif
945 ERR( "not enough space in %s heap %04x for %d bytes\n",
946 get_heap_name(ds), ds, size );
947 return 0;
948 }
949 ptr = MapSL( MAKESEGPTR( ds, 0 ) );
950 pInfo = LOCAL_GetHeap( ds );
951 arena = LOCAL_FindFreeBlock( ds, size );
952 }
953 if (arena == 0) {
954 ERR( "not enough space in %s heap %04x for %d bytes\n",
955 get_heap_name(ds), ds, size );
956 #if 0
957 /* FIXME: "size" correct ? (should indicate bytes needed) */
958 if (call_notify_func(pInfo->notify, LN_OUTOFMEM, ds, size)) goto notify_done;
959 #endif
960 return 0;
961 }
962
963 /* Make a block out of the free arena */
964 pArena = ARENA_PTR( ptr, arena );
965 TRACE("size = %04x, arena %04x size %04x\n", size, arena, pArena->size );
966 LOCAL_RemoveFreeBlock( ptr, arena );
967 LOCAL_ShrinkArena( ds, arena, size );
968
969 if (flags & LMEM_ZEROINIT)
970 memset((char *)pArena + ARENA_HEADER_SIZE, 0, size-ARENA_HEADER_SIZE);
971 return arena + ARENA_HEADER_SIZE;
972 }
973
974
975 /***********************************************************************
976 * LOCAL_NewHTable
977 */
978 static BOOL16 LOCAL_NewHTable( HANDLE16 ds )
979 {
980 char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
981 LOCALHEAPINFO *pInfo;
982 LOCALHANDLEENTRY *pEntry;
983 HLOCAL16 handle;
984 int i;
985
986 TRACE("\n" );
987 if (!(pInfo = LOCAL_GetHeap( ds )))
988 {
989 ERR("Local heap not found\n");
990 LOCAL_PrintHeap(ds);
991 return FALSE;
992 }
993
994 if (!(handle = LOCAL_GetBlock( ds, pInfo->hdelta * sizeof(LOCALHANDLEENTRY)
995 + 2 * sizeof(WORD), LMEM_FIXED )))
996 return FALSE;
997 if (!(ptr = MapSL( MAKESEGPTR( ds, 0 ) )))
998 ERR("ptr == NULL after GetBlock.\n");
999 if (!(pInfo = LOCAL_GetHeap( ds )))
1000 ERR("pInfo == NULL after GetBlock.\n");
1001
1002 /* Fill the entry table */
1003
1004 *(WORD *)(ptr + handle) = pInfo->hdelta;
1005 pEntry = (LOCALHANDLEENTRY *)(ptr + handle + sizeof(WORD));
1006 for (i = pInfo->hdelta; i > 0; i--, pEntry++) {
1007 pEntry->lock = pEntry->flags = 0xff;
1008 pEntry->addr = 0;
1009 }
1010 *(WORD *)pEntry = pInfo->htable;
1011 pInfo->htable = handle;
1012 return TRUE;
1013 }
1014
1015
1016 /***********************************************************************
1017 * LOCAL_GetNewHandleEntry
1018 */
1019 static HLOCAL16 LOCAL_GetNewHandleEntry( HANDLE16 ds )
1020 {
1021 char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
1022 LOCALHEAPINFO *pInfo;
1023 LOCALHANDLEENTRY *pEntry = NULL;
1024 WORD table;
1025
1026 if (!(pInfo = LOCAL_GetHeap( ds )))
1027 {
1028 ERR("Local heap not found\n");
1029 LOCAL_PrintHeap(ds);
1030 return 0;
1031 }
1032
1033 /* Find a free slot in existing tables */
1034
1035 table = pInfo->htable;
1036 while (table)
1037 {
1038 WORD count = *(WORD *)(ptr + table);
1039 pEntry = (LOCALHANDLEENTRY *)(ptr + table + sizeof(WORD));
1040 for (; count > 0; count--, pEntry++)
1041 if (pEntry->lock == 0xff) break;
1042 if (count) break;
1043 table = *(WORD *)pEntry;
1044 }
1045
1046 if (!table) /* We need to create a new table */
1047 {
1048 if (!LOCAL_NewHTable( ds )) return 0;
1049 ptr = MapSL( MAKESEGPTR( ds, 0 ) );
1050 pInfo = LOCAL_GetHeap( ds );
1051 pEntry = (LOCALHANDLEENTRY *)(ptr + pInfo->htable + sizeof(WORD));
1052 }
1053
1054 /* Now allocate this entry */
1055
1056 pEntry->lock = 0;
1057 pEntry->flags = 0;
1058 TRACE("(%04x): %04x\n", ds, ((char *)pEntry - ptr) );
1059 return (HLOCAL16)((char *)pEntry - ptr);
1060 }
1061
1062
1063 /***********************************************************************
1064 * LOCAL_FreeHandleEntry
1065 *
1066 * Free a handle table entry.
1067 */
1068 static void LOCAL_FreeHandleEntry( HANDLE16 ds, HLOCAL16 handle )
1069 {
1070 char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
1071 LOCALHANDLEENTRY *pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1072 LOCALHEAPINFO *pInfo;
1073 WORD *pTable;
1074 WORD table, count, i;
1075
1076 if (!(pInfo = LOCAL_GetHeap( ds ))) return;
1077
1078 /* Find the table where this handle comes from */
1079
1080 pTable = &pInfo->htable;
1081 while (*pTable)
1082 {
1083 WORD size = (*(WORD *)(ptr + *pTable)) * sizeof(LOCALHANDLEENTRY);
1084 if ((handle >= *pTable + sizeof(WORD)) &&
1085 (handle < *pTable + sizeof(WORD) + size)) break; /* Found it */
1086 pTable = (WORD *)(ptr + *pTable + sizeof(WORD) + size);
1087 }
1088 if (!*pTable)
1089 {
1090 ERR("Invalid entry %04x\n", handle);
1091 LOCAL_PrintHeap( ds );
1092 return;
1093 }
1094
1095 /* Make the entry free */
1096
1097 pEntry->addr = 0; /* just in case */
1098 pEntry->lock = 0xff;
1099 pEntry->flags = 0xff;
1100 /* Now check if all entries in this table are free */
1101
1102 table = *pTable;
1103 pEntry = (LOCALHANDLEENTRY *)(ptr + table + sizeof(WORD));
1104 count = *(WORD *)(ptr + table);
1105 for (i = count; i > 0; i--, pEntry++) if (pEntry->lock != 0xff) return;
1106
1107 /* Remove the table from the linked list and free it */
1108
1109 TRACE("(%04x): freeing table %04x\n", ds, table);
1110 *pTable = *(WORD *)pEntry;
1111 LOCAL_FreeArena( ds, ARENA_HEADER( table ) );
1112 }
1113
1114
1115 /***********************************************************************
1116 * LocalFree (KERNEL.7)
1117 */
1118 HLOCAL16 WINAPI LocalFree16( HLOCAL16 handle )
1119 {
1120 HANDLE16 ds = CURRENT_DS;
1121 char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
1122
1123 TRACE("%04x ds=%04x\n", handle, ds );
1124
1125 if (!handle) { WARN("Handle is 0.\n" ); return 0; }
1126 if (HANDLE_FIXED( handle ))
1127 {
1128 if (!LOCAL_FreeArena( ds, ARENA_HEADER( handle ) )) return 0; /* OK */
1129 else return handle; /* couldn't free it */
1130 }
1131 else
1132 {
1133 LOCALHANDLEENTRY *pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1134 if (pEntry->flags != (LMEM_DISCARDED >> 8))
1135 {
1136 TRACE("real block at %04x\n", pEntry->addr );
1137 if (LOCAL_FreeArena( ds, ARENA_HEADER(pEntry->addr - MOVEABLE_PREFIX) ))
1138 return handle; /* couldn't free it */
1139 }
1140 LOCAL_FreeHandleEntry( ds, handle );
1141 return 0; /* OK */
1142 }
1143 }
1144
1145
1146 /***********************************************************************
1147 * LocalAlloc (KERNEL.5)
1148 */
1149 HLOCAL16 WINAPI LocalAlloc16( UINT16 flags, WORD size )
1150 {
1151 HANDLE16 ds = CURRENT_DS;
1152 HLOCAL16 handle = 0;
1153 char *ptr;
1154
1155 TRACE("%04x %d ds=%04x\n", flags, size, ds );
1156
1157 if(size > 0 && size <= 4) size = 5;
1158 if (flags & LMEM_MOVEABLE)
1159 {
1160 LOCALHANDLEENTRY *plhe;
1161 HLOCAL16 hmem;
1162
1163 if(size)
1164 {
1165 if (!(hmem = LOCAL_GetBlock( ds, size + MOVEABLE_PREFIX, flags )))
1166 goto exit;
1167 }
1168 else /* We just need to allocate a discarded handle */
1169 hmem = 0;
1170 if (!(handle = LOCAL_GetNewHandleEntry( ds )))
1171 {
1172 WARN("Couldn't get handle.\n");
1173 if(hmem)
1174 LOCAL_FreeArena( ds, ARENA_HEADER(hmem) );
1175 goto exit;
1176 }
1177 ptr = MapSL( MAKESEGPTR( ds, 0 ) );
1178 plhe = (LOCALHANDLEENTRY *)(ptr + handle);
1179 plhe->lock = 0;
1180 if(hmem)
1181 {
1182 plhe->addr = hmem + MOVEABLE_PREFIX;
1183 plhe->flags = (BYTE)((flags & 0x0f00) >> 8);
1184 *(HLOCAL16 *)(ptr + hmem) = handle;
1185 }
1186 else
1187 {
1188 plhe->addr = 0;
1189 plhe->flags = LMEM_DISCARDED >> 8;
1190 }
1191 }
1192 else /* FIXED */
1193 {
1194 if(size) handle = LOCAL_GetBlock( ds, size, flags );
1195 }
1196
1197 exit:
1198 CURRENT_STACK16->ecx = handle; /* must be returned in cx too */
1199 return handle;
1200 }
1201
1202
1203 /***********************************************************************
1204 * LocalReAlloc (KERNEL.6)
1205 */
1206 HLOCAL16 WINAPI LocalReAlloc16( HLOCAL16 handle, WORD size, UINT16 flags )
1207 {
1208 HANDLE16 ds = CURRENT_DS;
1209 char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
1210 LOCALHEAPINFO *pInfo;
1211 LOCALARENA *pArena, *pNext;
1212 LOCALHANDLEENTRY *pEntry = NULL;
1213 WORD arena, oldsize;
1214 HLOCAL16 hmem, blockhandle;
1215 LONG nextarena;
1216
1217 if (!handle) return 0;
1218 if(HANDLE_MOVEABLE(handle) &&
1219 ((LOCALHANDLEENTRY *)(ptr + handle))->lock == 0xff) /* An unused handle */
1220 return 0;
1221
1222 TRACE("%04x %d %04x ds=%04x\n", handle, size, flags, ds );
1223 if (!(pInfo = LOCAL_GetHeap( ds ))) return 0;
1224
1225 if (HANDLE_FIXED( handle ))
1226 blockhandle = handle;
1227 else
1228 {
1229 pEntry = (LOCALHANDLEENTRY *) (ptr + handle);
1230 if(pEntry->flags == (LMEM_DISCARDED >> 8))
1231 {
1232 HLOCAL16 hl;
1233 if(pEntry->addr)
1234 WARN("Dicarded block has non-zero addr.\n");
1235 TRACE("ReAllocating discarded block\n");
1236 if(size <= 4) size = 5;
1237 if (!(hl = LOCAL_GetBlock( ds, size + MOVEABLE_PREFIX, flags)))
1238 return 0;
1239 ptr = MapSL( MAKESEGPTR( ds, 0 ) ); /* Reload ptr */
1240 pEntry = (LOCALHANDLEENTRY *) (ptr + handle);
1241 pEntry->addr = hl + MOVEABLE_PREFIX;
1242 pEntry->flags = 0;
1243 pEntry->lock = 0;
1244 *(HLOCAL16 *)(ptr + hl) = handle;
1245 return handle;
1246 }
1247 if (((blockhandle = pEntry->addr - MOVEABLE_PREFIX) & 3) != 0)
1248 {
1249 ERR("(%04x,%04x): invalid handle\n",
1250 ds, handle );
1251 return 0;
1252 }
1253 if (*(HLOCAL16 *)(ptr + blockhandle) != handle) {
1254 ERR("Back ptr to handle is invalid\n");
1255 return 0;
1256 }
1257 }
1258
1259 if (flags & LMEM_MODIFY)
1260 {
1261 if (HANDLE_MOVEABLE(handle))
1262 {
1263 pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1264 pEntry->flags = (flags & 0x0f00) >> 8;
1265 TRACE("Changing flags to %x.\n", pEntry->flags);
1266 }
1267 return handle;
1268 }
1269
1270 if (!size)
1271 {
1272 if (flags & LMEM_MOVEABLE)
1273 {
1274 if (HANDLE_FIXED(handle))
1275 {
1276 TRACE("Freeing fixed block.\n");
1277 return LocalFree16( handle );
1278 }
1279 else /* Moveable block */
1280 {
1281 pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1282 if (pEntry->lock == 0)
1283 {
1284 /* discards moveable blocks */
1285 TRACE("Discarding block\n");
1286 LOCAL_FreeArena(ds, ARENA_HEADER(pEntry->addr - MOVEABLE_PREFIX));
1287 pEntry->addr = 0;
1288 pEntry->flags = (LMEM_DISCARDED >> 8);
1289 return handle;
1290 }
1291 }
1292 return 0;
1293 }
1294 else if(flags == 0)
1295 {
1296 pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1297 if (pEntry->lock == 0)
1298 {
1299 /* Frees block */
1300 return LocalFree16( handle );
1301 }
1302 }
1303 return 0;
1304 }
1305
1306 arena = ARENA_HEADER( blockhandle );
1307 TRACE("arena is %04x\n", arena );
1308 pArena = ARENA_PTR( ptr, arena );
1309
1310 if(size <= 4) size = 5;
1311 if(HANDLE_MOVEABLE(handle)) size += MOVEABLE_PREFIX;
1312 oldsize = pArena->next - arena - ARENA_HEADER_SIZE;
1313 nextarena = LALIGN(blockhandle + size);
1314
1315 /* Check for size reduction */
1316
1317 if (nextarena <= pArena->next)
1318 {
1319 TRACE("size reduction, making new free block\n");
1320 LOCAL_ShrinkArena(ds, arena, nextarena - arena);
1321 TRACE("returning %04x\n", handle );
1322 return handle;
1323 }
1324
1325 /* Check if the next block is free and large enough */
1326
1327 pNext = ARENA_PTR( ptr, pArena->next );
1328 if (((pNext->prev & 3) == LOCAL_ARENA_FREE) &&
1329 (nextarena <= pNext->next))
1330 {
1331 TRACE("size increase, making new free block\n");
1332 LOCAL_GrowArenaUpward(ds, arena, nextarena - arena);
1333 if (flags & LMEM_ZEROINIT)
1334 memset((char *)pArena + oldsize, 0, size - oldsize);
1335
1336 TRACE("returning %04x\n", handle );
1337 return handle;
1338 }
1339
1340 /* Now we have to allocate a new block, but not if (fixed block or locked
1341 block) and no LMEM_MOVEABLE */
1342
1343 if (!(flags & LMEM_MOVEABLE))
1344 {
1345 if (HANDLE_FIXED(handle))
1346 {
1347 ERR("Needed to move fixed block, but LMEM_MOVEABLE not specified.\n");
1348 return 0;
1349 }
1350 else
1351 {
1352 if(((LOCALHANDLEENTRY *)(ptr + handle))->lock != 0)
1353 {
1354 ERR("Needed to move locked block, but LMEM_MOVEABLE not specified.\n");
1355 return 0;
1356 }
1357 }
1358 }
1359
1360 hmem = LOCAL_GetBlock( ds, size, flags );
1361 ptr = MapSL( MAKESEGPTR( ds, 0 )); /* Reload ptr */
1362 if(HANDLE_MOVEABLE(handle)) /* LOCAL_GetBlock might have triggered */
1363 { /* a compaction, which might in turn have */
1364 blockhandle = pEntry->addr - MOVEABLE_PREFIX; /* moved the very block we are resizing */
1365 arena = ARENA_HEADER( blockhandle ); /* thus, we reload arena, too */
1366 }
1367 if (!hmem)
1368 {
1369 /* Remove the block from the heap and try again */
1370 LPSTR buffer = HeapAlloc( GetProcessHeap(), 0, oldsize );
1371 if (!buffer) return 0;
1372 memcpy( buffer, ptr + arena + ARENA_HEADER_SIZE, oldsize );
1373 LOCAL_FreeArena( ds, arena );
1374 if (!(hmem = LOCAL_GetBlock( ds, size, flags )))
1375 {
1376 if (!(hmem = LOCAL_GetBlock( ds, oldsize, flags )))
1377 {
1378 ERR("Can't restore saved block\n" );
1379 HeapFree( GetProcessHeap(), 0, buffer );
1380 return 0;
1381 }
1382 size = oldsize;
1383 }
1384 ptr = MapSL( MAKESEGPTR( ds, 0 ) ); /* Reload ptr */
1385 memcpy( ptr + hmem, buffer, oldsize );
1386 HeapFree( GetProcessHeap(), 0, buffer );
1387 }
1388 else
1389 {
1390 memcpy( ptr + hmem, ptr + (arena + ARENA_HEADER_SIZE), oldsize );
1391 LOCAL_FreeArena( ds, arena );
1392 }
1393 if (HANDLE_MOVEABLE( handle ))
1394 {
1395 TRACE("fixing handle\n");
1396 pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1397 pEntry->addr = hmem + MOVEABLE_PREFIX;
1398 /* Back ptr should still be correct */
1399 if(*(HLOCAL16 *)(ptr + hmem) != handle)
1400 ERR("back ptr is invalid.\n");
1401 hmem = handle;
1402 }
1403 if (size == oldsize) hmem = 0; /* Realloc failed */
1404 TRACE("returning %04x\n", hmem );
1405 return hmem;
1406 }
1407
1408
1409 /***********************************************************************
1410 * LOCAL_InternalLock
1411 */
1412 static HLOCAL16 LOCAL_InternalLock( LPSTR heap, HLOCAL16 handle )
1413 {
1414 HLOCAL16 old_handle = handle;
1415
1416 if (HANDLE_MOVEABLE(handle))
1417 {
1418 LOCALHANDLEENTRY *pEntry = (LOCALHANDLEENTRY *)(heap + handle);
1419 if (pEntry->flags == (LMEM_DISCARDED >> 8)) return 0;
1420 if (pEntry->lock < 0xfe) pEntry->lock++;
1421 handle = pEntry->addr;
1422 }
1423 TRACE("%04x returning %04x\n", old_handle, handle );
1424 return handle;
1425 }
1426
1427
1428 /***********************************************************************
1429 * LocalUnlock (KERNEL.9)
1430 */
1431 BOOL16 WINAPI LocalUnlock16( HLOCAL16 handle )
1432 {
1433 HANDLE16 ds = CURRENT_DS;
1434 char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
1435
1436 TRACE("%04x\n", handle );
1437 if (HANDLE_MOVEABLE(handle))
1438 {
1439 LOCALHANDLEENTRY *pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1440 if (!pEntry->lock || (pEntry->lock == 0xff)) return FALSE;
1441 /* For moveable block, return the new lock count */
1442 /* (see _Windows_Internals_ p. 197) */
1443 return --pEntry->lock;
1444 }
1445 else return FALSE;
1446 }
1447
1448
1449 /***********************************************************************
1450 * LocalSize (KERNEL.10)
1451 */
1452 UINT16 WINAPI LocalSize16( HLOCAL16 handle )
1453 {
1454 HANDLE16 ds = CURRENT_DS;
1455 char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
1456 LOCALARENA *pArena;
1457
1458 TRACE("%04x ds=%04x\n", handle, ds );
1459
1460 if (!handle) return 0;
1461 if (HANDLE_MOVEABLE( handle ))
1462 {
1463 handle = *(WORD *)(ptr + handle);
1464 if (!handle) return 0;
1465 pArena = ARENA_PTR( ptr, ARENA_HEADER(handle - MOVEABLE_PREFIX) );
1466 }
1467 else
1468 pArena = ARENA_PTR( ptr, ARENA_HEADER(handle) );
1469
1470 return pArena->next - handle;
1471 }
1472
1473
1474 /***********************************************************************
1475 * LocalFlags (KERNEL.12)
1476 */
1477 UINT16 WINAPI LocalFlags16( HLOCAL16 handle )
1478 {
1479 HANDLE16 ds = CURRENT_DS;
1480 char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
1481
1482 if (HANDLE_MOVEABLE(handle))
1483 {
1484 LOCALHANDLEENTRY *pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1485 TRACE("(%04x,%04x): returning %04x\n",
1486 ds, handle, pEntry->lock | (pEntry->flags << 8) );
1487 return pEntry->lock | (pEntry->flags << 8);
1488 }
1489 else
1490 {
1491 TRACE("(%04x,%04x): returning 0\n",
1492 ds, handle );
1493 return 0;
1494 }
1495 }
1496
1497
1498 /***********************************************************************
1499 * LocalHeapSize (KERNEL.162)
1500 */
1501 WORD WINAPI LocalHeapSize16(void)
1502 {
1503 HANDLE16 ds = CURRENT_DS;
1504 LOCALHEAPINFO *pInfo = LOCAL_GetHeap( ds );
1505 return pInfo ? pInfo->last - pInfo->first : 0;
1506 }
1507
1508
1509 /***********************************************************************
1510 * LocalCountFree (KERNEL.161)
1511 */
1512 WORD WINAPI LocalCountFree16(void)
1513 {
1514 HANDLE16 ds = CURRENT_DS;
1515 WORD arena, total;
1516 LOCALARENA *pArena;
1517 LOCALHEAPINFO *pInfo;
1518 char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
1519
1520 if (!(pInfo = LOCAL_GetHeap( ds )))
1521 {
1522 ERR("(%04x): Local heap not found\n", ds );
1523 LOCAL_PrintHeap( ds );
1524 return 0;
1525 }
1526
1527 total = 0;
1528 arena = pInfo->first;
1529 pArena = ARENA_PTR( ptr, arena );
1530 for (;;)
1531 {
1532 arena = pArena->free_next;
1533 pArena = ARENA_PTR( ptr, arena );
1534 if (arena == pArena->free_next) break;
1535 total += pArena->size;
1536 }
1537 TRACE("(%04x): returning %d\n", ds, total);
1538 return total;
1539 }
1540
1541
1542 /***********************************************************************
1543 * LocalHandle (KERNEL.11)
1544 */
1545 HLOCAL16 WINAPI LocalHandle16( WORD addr )
1546 {
1547 HANDLE16 ds = CURRENT_DS;
1548 char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
1549 LOCALHEAPINFO *pInfo;
1550 WORD table;
1551
1552 if (!(pInfo = LOCAL_GetHeap( ds )))
1553 {
1554 ERR("(%04x): Local heap not found\n", ds );
1555 LOCAL_PrintHeap( ds );
1556 return 0;
1557 }
1558
1559 /* Find the address in the entry tables */
1560
1561 table = pInfo->htable;
1562 while (table)
1563 {
1564 WORD count = *(WORD *)(ptr + table);
1565 LOCALHANDLEENTRY *pEntry = (LOCALHANDLEENTRY*)(ptr+table+sizeof(WORD));
1566 for (; count > 0; count--, pEntry++)
1567 if (pEntry->addr == addr) return (HLOCAL16)((char *)pEntry - ptr);
1568 table = *(WORD *)pEntry;
1569 }
1570
1571 return (HLOCAL16)addr; /* Fixed block handle is addr */
1572 }
1573
1574
1575
1576
1577 /***********************************************************************
1578 * LocalLock (KERNEL.8)
1579 *
1580 * Note: only the offset part of the pointer is returned by the relay code.
1581 */
1582 SEGPTR WINAPI LocalLock16( HLOCAL16 handle )
1583 {
1584 WORD ds = CURRENT_DS;
1585 char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
1586 return MAKESEGPTR( ds, LOCAL_InternalLock( ptr, handle ) );
1587 }
1588
1589
1590 /***********************************************************************
1591 * LocalCompact (KERNEL.13)
1592 */
1593 UINT16 WINAPI LocalCompact16( UINT16 minfree )
1594 {
1595 TRACE("%04x\n", minfree );
1596 return LOCAL_Compact( CURRENT_DS, minfree, 0 );
1597 }
1598
1599
1600 /***********************************************************************
1601 * LocalNotify (KERNEL.14)
1602 *
1603 * Installs a callback function that is called for local memory events
1604 * Callback function prototype is
1605 * BOOL16 NotifyFunc(WORD wMsg, HLOCAL16 hMem, WORD wArg)
1606 * wMsg:
1607 * - LN_OUTOFMEM
1608 * NotifyFunc seems to be responsible for allocating some memory,
1609 * returns TRUE for success.
1610 * wArg = number of bytes needed additionally
1611 * - LN_MOVE
1612 * hMem = handle; wArg = old mem location
1613 * - LN_DISCARD
1614 * NotifyFunc seems to be strongly encouraged to return TRUE,
1615 * otherwise LogError() gets called.
1616 * hMem = handle; wArg = flags
1617 */
1618 FARPROC16 WINAPI LocalNotify16( FARPROC16 func )
1619 {
1620 LOCALHEAPINFO *pInfo;
1621 FARPROC16 oldNotify;
1622 HANDLE16 ds = CURRENT_DS;
1623
1624 if (!(pInfo = LOCAL_GetHeap( ds )))
1625 {
1626 ERR("(%04x): Local heap not found\n", ds );
1627 LOCAL_PrintHeap( ds );
1628 return 0;
1629 }
1630 TRACE("(%04x): %p\n", ds, func );
1631 FIXME("Half implemented\n");
1632 oldNotify = pInfo->notify;
1633 pInfo->notify = func;
1634 return oldNotify;
1635 }
1636
1637
1638 /***********************************************************************
1639 * LocalShrink (KERNEL.121)
1640 */
1641 UINT16 WINAPI LocalShrink16( HGLOBAL16 handle, UINT16 newsize )
1642 {
1643 TRACE("%04x %04x\n", handle, newsize );
1644 return 0;
1645 }
1646
1647
1648 /***********************************************************************
1649 * GetHeapSpaces (KERNEL.138)
1650 */
1651 DWORD WINAPI GetHeapSpaces16( HMODULE16 module )
1652 {
1653 NE_MODULE *pModule;
1654 WORD oldDS = CURRENT_DS;
1655 DWORD spaces;
1656
1657 if (!(pModule = NE_GetPtr( module ))) return 0;
1658 CURRENT_DS = GlobalHandleToSel16((NE_SEG_TABLE( pModule ) + pModule->ne_autodata - 1)->hSeg);
1659 spaces = MAKELONG( LocalCountFree16(), LocalHeapSize16() );
1660 CURRENT_DS = oldDS;
1661 return spaces;
1662 }
1663
1664
1665 /***********************************************************************
1666 * LocalHandleDelta (KERNEL.310)
1667 */
1668 WORD WINAPI LocalHandleDelta16( WORD delta )
1669 {
1670 LOCALHEAPINFO *pInfo;
1671
1672 if (!(pInfo = LOCAL_GetHeap( CURRENT_DS )))
1673 {
1674 ERR("Local heap not found\n");
1675 LOCAL_PrintHeap( CURRENT_DS );
1676 return 0;
1677 }
1678 if (delta) pInfo->hdelta = delta;
1679 TRACE("returning %04x\n", pInfo->hdelta);
1680 return pInfo->hdelta;
1681 }
1682
1683
1684 /***********************************************************************
1685 * LocalInfo (TOOLHELP.56)
1686 */
1687 BOOL16 WINAPI LocalInfo16( LOCALINFO *pLocalInfo, HGLOBAL16 handle )
1688 {
1689 LOCALHEAPINFO *pInfo = LOCAL_GetHeap(SELECTOROF(WOWGlobalLock16(handle)));
1690 if (!pInfo) return FALSE;
1691 pLocalInfo->wcItems = pInfo->items;
1692 return TRUE;
1693 }
1694
1695
1696 /***********************************************************************
1697 * LocalFirst (TOOLHELP.57)
1698 */
1699 BOOL16 WINAPI LocalFirst16( LOCALENTRY *pLocalEntry, HGLOBAL16 handle )
1700 {
1701 WORD ds = GlobalHandleToSel16( handle );
1702 char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
1703 LOCALHEAPINFO *pInfo = LOCAL_GetHeap( ds );
1704 if (!pInfo) return FALSE;
1705
1706 pLocalEntry->hHandle = pInfo->first + ARENA_HEADER_SIZE;
1707 pLocalEntry->wAddress = pLocalEntry->hHandle;
1708 pLocalEntry->wFlags = LF_FIXED;
1709 pLocalEntry->wcLock = 0;
1710 pLocalEntry->wType = LT_NORMAL;
1711 pLocalEntry->hHeap = handle;
1712 pLocalEntry->wHeapType = NORMAL_HEAP;
1713 pLocalEntry->wNext = ARENA_PTR(ptr,pInfo->first)->next;
1714 pLocalEntry->wSize = pLocalEntry->wNext - pLocalEntry->hHandle;
1715 return TRUE;
1716 }
1717
1718
1719 /***********************************************************************
1720 * LocalNext (TOOLHELP.58)
1721 */
1722 BOOL16 WINAPI LocalNext16( LOCALENTRY *pLocalEntry )
1723 {
1724 WORD ds = GlobalHandleToSel16( pLocalEntry->hHeap );
1725 char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
1726 LOCALARENA *pArena;
1727
1728 if (!LOCAL_GetHeap( ds )) return FALSE;
1729 if (!pLocalEntry->wNext) return FALSE;
1730 pArena = ARENA_PTR( ptr, pLocalEntry->wNext );
1731
1732 pLocalEntry->hHandle = pLocalEntry->wNext + ARENA_HEADER_SIZE;
1733 pLocalEntry->wAddress = pLocalEntry->hHandle;
1734 pLocalEntry->wFlags = (pArena->prev & 3) + 1;
1735 pLocalEntry->wcLock = 0;
1736 pLocalEntry->wType = LT_NORMAL;
1737 if (pArena->next != pLocalEntry->wNext) /* last one? */
1738 pLocalEntry->wNext = pArena->next;
1739 else
1740 pLocalEntry->wNext = 0;
1741 pLocalEntry->wSize = pLocalEntry->wNext - pLocalEntry->hHandle;
1742 return TRUE;
1743 }
1744
1745
1746 /***********************************************************************
1747 * 32-bit local heap functions (Win95; undocumented)
1748 */
1749
1750 /***********************************************************************
1751 * K208 (KERNEL.208)
1752 */
1753 HANDLE WINAPI Local32Init16( WORD segment, DWORD tableSize,
1754 DWORD heapSize, DWORD flags )
1755 {
1756 DWORD totSize, segSize = 0;
1757 LPBYTE base;
1758 LOCAL32HEADER *header;
1759 HANDLE heap;
1760 WORD *selectorTable;
1761 WORD selectorEven, selectorOdd;
1762 int i, nrBlocks;
1763
1764 /* Determine new heap size */
1765
1766 if ( segment )
1767 {
1768 if ( (segSize = GetSelectorLimit16( segment )) == 0 )
1769 return 0;
1770 else
1771 segSize++;
1772 }
1773
1774 if ( heapSize == (DWORD)-1 )
1775 heapSize = 1024*1024; /* FIXME */
1776
1777 heapSize = (heapSize + 0xffff) & 0xffff0000;
1778 segSize = (segSize + 0x0fff) & 0xfffff000;
1779 totSize = segSize + HTABLE_SIZE + heapSize;
1780
1781
1782 /* Allocate memory and initialize heap */
1783
1784 if ( !(base = VirtualAlloc( NULL, totSize, MEM_RESERVE, PAGE_READWRITE )) )
1785 return 0;
1786
1787 if ( !VirtualAlloc( base, segSize + HTABLE_PAGESIZE,
1788 MEM_COMMIT, PAGE_READWRITE ) )
1789 {
1790 VirtualFree( base, 0, MEM_RELEASE );
1791 return 0;
1792 }
1793
1794 if (!(heap = RtlCreateHeap( 0, base + segSize + HTABLE_SIZE, heapSize, 0x10000, NULL, NULL )))
1795 {
1796 VirtualFree( base, 0, MEM_RELEASE );
1797 return 0;
1798 }
1799
1800
1801 /* Set up header and handle table */
1802
1803 header = (LOCAL32HEADER *)(base + segSize);
1804 header->base = base;
1805 header->limit = HTABLE_PAGESIZE-1;
1806 header->flags = 0;
1807 header->magic = LOCAL32_MAGIC;
1808 header->heap = heap;
1809
1810 header->freeListFirst[0] = sizeof(LOCAL32HEADER);
1811 header->freeListLast[0] = HTABLE_PAGESIZE - 4;
1812 header->freeListSize[0] = (HTABLE_PAGESIZE - sizeof(LOCAL32HEADER)) / 4;
1813
1814 for (i = header->freeListFirst[0]; i < header->freeListLast[0]; i += 4)
1815 *(DWORD *)((LPBYTE)header + i) = i+4;
1816
1817 header->freeListFirst[1] = 0xffff;
1818
1819
1820 /* Set up selector table */
1821
1822 nrBlocks = (totSize + 0x7fff) >> 15;
1823 selectorTable = HeapAlloc( header->heap, 0, nrBlocks * 2 );
1824 selectorEven = SELECTOR_AllocBlock( base, totSize, WINE_LDT_FLAGS_DATA );
1825 selectorOdd = SELECTOR_AllocBlock( base + 0x8000, totSize - 0x8000, WINE_LDT_FLAGS_DATA );
1826 if ( !selectorTable || !selectorEven || !selectorOdd )
1827 {
1828 HeapFree( header->heap, 0, selectorTable );
1829 if ( selectorEven ) SELECTOR_FreeBlock( selectorEven );
1830 if ( selectorOdd ) SELECTOR_FreeBlock( selectorOdd );
1831 HeapDestroy( header->heap );
1832 VirtualFree( base, 0, MEM_RELEASE );
1833 return 0;
1834 }
1835
1836 header->selectorTableOffset = (LPBYTE)selectorTable - header->base;
1837 header->selectorTableSize = nrBlocks * 4; /* ??? Win95 does it this way! */
1838 header->selectorDelta = selectorEven - selectorOdd;
1839 header->segment = segment? segment : selectorEven;
1840
1841 for (i = 0; i < nrBlocks; i++)
1842 selectorTable[i] = (i & 1)? selectorOdd + ((i >> 1) << __AHSHIFT)
1843 : selectorEven + ((i >> 1) << __AHSHIFT);
1844
1845 /* Move old segment */
1846
1847 if ( segment )
1848 {
1849 /* FIXME: This is somewhat ugly and relies on implementation
1850 details about 16-bit global memory handles ... */
1851
1852 LPBYTE oldBase = (LPBYTE)GetSelectorBase( segment );
1853 memcpy( base, oldBase, segSize );
1854 GLOBAL_MoveBlock( segment, base, totSize );
1855 HeapFree( GetProcessHeap(), 0, oldBase );
1856 }
1857
1858 return (HANDLE)header;
1859 }
1860
1861 /***********************************************************************
1862 * Local32_SearchHandle
1863 */
1864 static LPDWORD Local32_SearchHandle( LOCAL32HEADER *header, DWORD addr )
1865 {
1866 LPDWORD handle;
1867
1868 for ( handle = (LPDWORD)((LPBYTE)header + sizeof(LOCAL32HEADER));
1869 handle < (LPDWORD)((LPBYTE)header + header->limit);
1870 handle++)
1871 {
1872 if (*handle == addr)
1873 return handle;
1874 }
1875
1876 return NULL;
1877 }
1878
1879 /***********************************************************************
1880 * Local32_ToHandle
1881 */
1882 static VOID Local32_ToHandle( LOCAL32HEADER *header, INT16 type,
1883 DWORD addr, LPDWORD *handle, LPBYTE *ptr )
1884 {
1885 *handle = NULL;
1886 *ptr = NULL;
1887
1888 switch (type)
1889 {
1890 case -2: /* 16:16 pointer, no handles */
1891 *ptr = MapSL( addr );
1892 *handle = (LPDWORD)*ptr;
1893 break;
1894
1895 case -1: /* 32-bit offset, no handles */
1896 *ptr = header->base + addr;
1897 *handle = (LPDWORD)*ptr;
1898 break;
1899
1900 case 0: /* handle */
1901 if ( addr >= sizeof(LOCAL32HEADER)
1902 && addr < header->limit && !(addr & 3)
1903 && *(LPDWORD)((LPBYTE)header + addr) >= HTABLE_SIZE )
1904 {
1905 *handle = (LPDWORD)((LPBYTE)header + addr);
1906 *ptr = header->base + **handle;
1907 }
1908 break;
1909
1910 case 1: /* 16:16 pointer */
1911 *ptr = MapSL( addr );
1912 *handle = Local32_SearchHandle( header, *ptr - header->base );
1913 break;
1914
1915 case 2: /* 32-bit offset */
1916 *ptr = header->base + addr;
1917 *handle = Local32_SearchHandle( header, *ptr - header->base );
1918 break;
1919 }
1920 }
1921
1922 /***********************************************************************
1923 * Local32_FromHandle
1924 */
1925 static VOID Local32_FromHandle( LOCAL32HEADER *header, INT16 type,
1926 DWORD *addr, LPDWORD handle, LPBYTE ptr )
1927 {
1928 switch (type)
1929 {
1930 case -2: /* 16:16 pointer */
1931 case 1:
1932 {
1933 WORD *selTable = (LPWORD)(header->base + header->selectorTableOffset);
1934 DWORD offset = (LPBYTE)ptr - header->base;
1935 *addr = MAKELONG( offset & 0x7fff, selTable[offset >> 15] );
1936 }
1937 break;
1938
1939 case -1: /* 32-bit offset */
1940 case 2:
1941 *addr = ptr - header->base;
1942 break;
1943
1944 case 0: /* handle */
1945 *addr = (LPBYTE)handle - (LPBYTE)header;
1946 break;
1947 }
1948 }
1949
1950 /***********************************************************************
1951 * K209 (KERNEL.209)
1952 */
1953 DWORD WINAPI Local32Alloc16( HANDLE heap, DWORD size, INT16 type, DWORD flags )
1954 {
1955 LOCAL32HEADER *header = (LOCAL32HEADER *)heap;
1956 LPDWORD handle;
1957 LPBYTE ptr;
1958 DWORD addr;
1959
1960 /* Allocate memory */
1961 ptr = HeapAlloc( header->heap,
1962 (flags & LMEM_MOVEABLE)? HEAP_ZERO_MEMORY : 0, size );
1963 if (!ptr) return 0;
1964
1965
1966 /* Allocate handle if requested */
1967 if (type >= 0)
1968 {
1969 int page, i;
1970
1971 /* Find first page of handle table with free slots */
1972 for (page = 0; page < HTABLE_NPAGES; page++)
1973 if (header->freeListFirst[page] != 0)
1974 break;
1975 if (page == HTABLE_NPAGES)
1976 {
1977 WARN("Out of handles!\n" );
1978 HeapFree( header->heap, 0, ptr );
1979 return 0;
1980 }
1981
1982 /* If virgin page, initialize it */
1983 if (header->freeListFirst[page] == 0xffff)
1984 {
1985 if ( !VirtualAlloc( (LPBYTE)header + (page << 12),
1986 0x1000, MEM_COMMIT, PAGE_READWRITE ) )
1987 {
1988 WARN("Cannot grow handle table!\n" );
1989 HeapFree( header->heap, 0, ptr );
1990 return 0;
1991 }
1992
1993 header->limit += HTABLE_PAGESIZE;
1994
1995 header->freeListFirst[page] = 0;
1996 header->freeListLast[page] = HTABLE_PAGESIZE - 4;
1997 header->freeListSize[page] = HTABLE_PAGESIZE / 4;
1998
1999 for (i = 0; i < HTABLE_PAGESIZE; i += 4)
2000 *(DWORD *)((LPBYTE)header + i) = i+4;
2001
2002 if (page < HTABLE_NPAGES-1)
2003 header->freeListFirst[page+1] = 0xffff;
2004 }
2005
2006 /* Allocate handle slot from page */
2007 handle = (LPDWORD)((LPBYTE)header + header->freeListFirst[page]);
2008 if (--header->freeListSize[page] == 0)
2009 header->freeListFirst[page] = header->freeListLast[page] = 0;
2010 else
2011 header->freeListFirst[page] = *handle;
2012
2013 /* Store 32-bit offset in handle slot */
2014 *handle = ptr - header->base;
2015 }
2016 else
2017 {
2018 handle = (LPDWORD)ptr;
2019 header->flags |= 1;
2020 }
2021
2022
2023 /* Convert handle to requested output type */
2024 Local32_FromHandle( header, type, &addr, handle, ptr );
2025 return addr;
2026 }
2027
2028 /***********************************************************************
2029 * K210 (KERNEL.210)
2030 */
2031 DWORD WINAPI Local32ReAlloc16( HANDLE heap, DWORD addr, INT16 type,
2032 DWORD size, DWORD flags )
2033 {
2034 LOCAL32HEADER *header = (LOCAL32HEADER *)heap;
2035 LPDWORD handle;
2036 LPBYTE ptr;
2037
2038 if (!addr)
2039 return Local32Alloc16( heap, size, type, flags );
2040
2041 /* Retrieve handle and pointer */
2042 Local32_ToHandle( header, type, addr, &handle, &ptr );
2043 if (!handle) return FALSE;
2044
2045 /* Reallocate memory block */
2046 ptr = HeapReAlloc( header->heap,
2047 (flags & LMEM_MOVEABLE)? HEAP_ZERO_MEMORY : 0,
2048 ptr, size );
2049 if (!ptr) return 0;
2050
2051 /* Modify handle */
2052 if (type >= 0)
2053 *handle = ptr - header->base;
2054 else
2055 handle = (LPDWORD)ptr;
2056
2057 /* Convert handle to requested output type */
2058 Local32_FromHandle( header, type, &addr, handle, ptr );
2059 return addr;
2060 }
2061
2062 /***********************************************************************
2063 * K211 (KERNEL.211)
2064 */
2065 BOOL WINAPI Local32Free16( HANDLE heap, DWORD addr, INT16 type )
2066 {
2067 LOCAL32HEADER *header = (LOCAL32HEADER *)heap;
2068 LPDWORD handle;
2069 LPBYTE ptr;
2070
2071 /* Retrieve handle and pointer */
2072 Local32_ToHandle( header, type, addr, &handle, &ptr );
2073 if (!handle) return FALSE;
2074
2075 /* Free handle if necessary */
2076 if (type >= 0)
2077 {
2078 int offset = (LPBYTE)handle - (LPBYTE)header;
2079 int page = offset >> 12;
2080
2081 /* Return handle slot to page free list */
2082 if (header->freeListSize[page]++ == 0)
2083 header->freeListFirst[page] = header->freeListLast[page] = offset;
2084 else
2085 *(LPDWORD)((LPBYTE)header + header->freeListLast[page]) = offset,
2086 header->freeListLast[page] = offset;
2087
2088 *handle = 0;
2089
2090 /* Shrink handle table when possible */
2091 while (page > 0 && header->freeListSize[page] == HTABLE_PAGESIZE / 4)
2092 {
2093 if ( VirtualFree( (LPBYTE)header +
2094 (header->limit & ~(HTABLE_PAGESIZE-1)),
2095 HTABLE_PAGESIZE, MEM_DECOMMIT ) )
2096 break;
2097
2098 header->limit -= HTABLE_PAGESIZE;
2099 header->freeListFirst[page] = 0xffff;
2100 page--;
2101 }
2102 }
2103
2104 /* Free memory */
2105 return HeapFree( header->heap, 0, ptr );
2106 }
2107
2108 /***********************************************************************
2109 * K213 (KERNEL.213)
2110 */
2111 DWORD WINAPI Local32Translate16( HANDLE heap, DWORD addr, INT16 type1, INT16 type2 )
2112 {
2113 LOCAL32HEADER *header = (LOCAL32HEADER *)heap;
2114 LPDWORD handle;
2115 LPBYTE ptr;
2116
2117 Local32_ToHandle( header, type1, addr, &handle, &ptr );
2118 if (!handle) return 0;
2119
2120 Local32_FromHandle( header, type2, &addr, handle, ptr );
2121 return addr;
2122 }
2123
2124 /***********************************************************************
2125 * K214 (KERNEL.214)
2126 */
2127 DWORD WINAPI Local32Size16( HANDLE heap, DWORD addr, INT16 type )
2128 {
2129 LOCAL32HEADER *header = (LOCAL32HEADER *)heap;
2130 LPDWORD handle;
2131 LPBYTE ptr;
2132
2133 Local32_ToHandle( header, type, addr, &handle, &ptr );
2134 if (!handle) return 0;
2135
2136 return HeapSize( header->heap, 0, ptr );
2137 }
2138
2139 /***********************************************************************
2140 * K215 (KERNEL.215)
2141 */
2142 BOOL WINAPI Local32ValidHandle16( HANDLE heap, WORD addr )
2143 {
2144 LOCAL32HEADER *header = (LOCAL32HEADER *)heap;
2145 LPDWORD handle;
2146 LPBYTE ptr;
2147
2148 Local32_ToHandle( header, 0, addr, &handle, &ptr );
2149 return handle != NULL;
2150 }
2151
2152 /***********************************************************************
2153 * K229 (KERNEL.229)
2154 */
2155 WORD WINAPI Local32GetSegment16( HANDLE heap )
2156 {
2157 LOCAL32HEADER *header = (LOCAL32HEADER *)heap;
2158 return header->segment;
2159 }
2160
2161 /***********************************************************************
2162 * Local32_GetHeap
2163 */
2164 static LOCAL32HEADER *Local32_GetHeap( HGLOBAL16 handle )
2165 {
2166 WORD selector = GlobalHandleToSel16( handle );
2167 DWORD base = GetSelectorBase( selector );
2168 DWORD limit = GetSelectorLimit16( selector );
2169
2170 /* Hmmm. This is a somewhat stupid heuristic, but Windows 95 does
2171 it this way ... */
2172
2173 if ( limit > 0x10000 && ((LOCAL32HEADER *)base)->magic == LOCAL32_MAGIC )
2174 return (LOCAL32HEADER *)base;
2175
2176 base += 0x10000;
2177 limit -= 0x10000;
2178
2179 if ( limit > 0x10000 && ((LOCAL32HEADER *)base)->magic == LOCAL32_MAGIC )
2180 return (LOCAL32HEADER *)base;
2181
2182 return NULL;
2183 }
2184
2185 /***********************************************************************
2186 * Local32Info (KERNEL.444)
2187 * Local32Info (TOOLHELP.84)
2188 */
2189 BOOL16 WINAPI Local32Info16( LOCAL32INFO *pLocal32Info, HGLOBAL16 handle )
2190 {
2191 PROCESS_HEAP_ENTRY entry;
2192 int i;
2193
2194 LOCAL32HEADER *header = Local32_GetHeap( handle );
2195 if ( !header ) return FALSE;
2196
2197 if ( !pLocal32Info || pLocal32Info->dwSize < sizeof(LOCAL32INFO) )
2198 return FALSE;
2199
2200 pLocal32Info->dwMemReserved = 0;
2201 pLocal32Info->dwMemCommitted = 0;
2202 pLocal32Info->dwTotalFree = 0;
2203 pLocal32Info->dwLargestFreeBlock = 0;
2204
2205 while (HeapWalk( header->heap, &entry ))
2206 {
2207 if (entry.wFlags & PROCESS_HEAP_REGION)
2208 {
2209 pLocal32Info->dwMemReserved += entry.u.Region.dwCommittedSize
2210 + entry.u.Region.dwUnCommittedSize;
2211 pLocal32Info->dwMemCommitted = entry.u.Region.dwCommittedSize;
2212 }
2213 else if (!(entry.wFlags & PROCESS_HEAP_ENTRY_BUSY))
2214 {
2215 DWORD size = entry.cbData + entry.cbOverhead;
2216 pLocal32Info->dwTotalFree += size;
2217 if (size > pLocal32Info->dwLargestFreeBlock) pLocal32Info->dwLargestFreeBlock = size;
2218 }
2219 }
2220
2221 pLocal32Info->dwcFreeHandles = 0;
2222 for ( i = 0; i < HTABLE_NPAGES; i++ )
2223 {
2224 if ( header->freeListFirst[i] == 0xffff ) break;
2225 pLocal32Info->dwcFreeHandles += header->freeListSize[i];
2226 }
2227 pLocal32Info->dwcFreeHandles += (HTABLE_NPAGES - i) * HTABLE_PAGESIZE/4;
2228
2229 return TRUE;
2230 }
2231
2232 /***********************************************************************
2233 * Local32First (KERNEL.445)
2234 * Local32First (TOOLHELP.85)
2235 */
2236 BOOL16 WINAPI Local32First16( LOCAL32ENTRY *pLocal32Entry, HGLOBAL16 handle )
2237 {
2238 FIXME("(%p, %04X): stub!\n", pLocal32Entry, handle );
2239 return FALSE;
2240 }
2241
2242 /***********************************************************************
2243 * Local32Next (KERNEL.446)
2244 * Local32Next (TOOLHELP.86)
2245 */
2246 BOOL16 WINAPI Local32Next16( LOCAL32ENTRY *pLocal32Entry )
2247 {
2248 FIXME("(%p): stub!\n", pLocal32Entry );
2249 return FALSE;
2250 }
useful hacks and other patches not (yet) suitable for mainline