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[wine.git] / dlls / kernel32 / local16.c
blob48bc6c3588fd0e0847945e955177debfc23621dd
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;
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 if ((pPrev->prev & 3) == LOCAL_ARENA_FREE)
594 {
595 arena = pArena->prev & ~3;
596 pArena = pPrev;
597 LOCAL_RemoveBlock( ptr, pPrev->next );
598 pInfo->items--;
599 }
600 else /* Make a new free block */
601 {
602 LOCAL_MakeBlockFree( ptr, arena );
603 }
604
605 /* Check if we can merge with the next block */
606
607 if ((pArena->next == pArena->free_next) &&
608 (pArena->next != pInfo->last))
609 {
610 LOCAL_RemoveBlock( ptr, pArena->next );
611 pInfo->items--;
612 }
613 return 0;
614 }
615
616
617 /***********************************************************************
618 * LOCAL_ShrinkArena
619 *
620 * Shrink an arena by creating a free block at its end if possible.
621 * 'size' includes the arena header, and must be aligned.
622 */
623 static void LOCAL_ShrinkArena( WORD ds, WORD arena, WORD size )
624 {
625 char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
626 LOCALARENA *pArena = ARENA_PTR( ptr, arena );
627
628 if (arena + size + LALIGN(sizeof(LOCALARENA)) < pArena->next)
629 {
630 LOCALHEAPINFO *pInfo = LOCAL_GetHeap( ds );
631 if (!pInfo) return;
632 LOCAL_AddBlock( ptr, arena, arena + size );
633 pInfo->items++;
634 LOCAL_FreeArena( ds, arena + size );
635 }
636 }
637
638
639 /***********************************************************************
640 * LOCAL_GrowArenaDownward
641 *
642 * Grow an arena downward by using the previous arena (must be free).
643 */
644 static void LOCAL_GrowArenaDownward( WORD ds, WORD arena, WORD newsize )
645 {
646 char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
647 LOCALHEAPINFO *pInfo;
648 LOCALARENA *pArena = ARENA_PTR( ptr, arena );
649 WORD prevArena = pArena->prev & ~3;
650 LOCALARENA *pPrevArena = ARENA_PTR( ptr, prevArena );
651 WORD offset, size;
652 char *p;
653
654 if (!(pInfo = LOCAL_GetHeap( ds ))) return;
655 offset = pPrevArena->size;
656 size = pArena->next - arena - ARENA_HEADER_SIZE;
657 LOCAL_RemoveFreeBlock( ptr, prevArena );
658 LOCAL_RemoveBlock( ptr, arena );
659 pInfo->items--;
660 p = (char *)pPrevArena + ARENA_HEADER_SIZE;
661 while (offset < size)
662 {
663 memcpy( p, p + offset, offset );
664 p += offset;
665 size -= offset;
666 }
667 if (size) memcpy( p, p + offset, size );
668 LOCAL_ShrinkArena( ds, prevArena, newsize );
669 }
670
671
672
673 /***********************************************************************
674 * LOCAL_GrowArenaUpward
675 *
676 * Grow an arena upward by using the next arena (must be free and big
677 * enough). Newsize includes the arena header and must be aligned.
678 */
679 static void LOCAL_GrowArenaUpward( WORD ds, WORD arena, WORD newsize )
680 {
681 char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
682 LOCALHEAPINFO *pInfo;
683 LOCALARENA *pArena = ARENA_PTR( ptr, arena );
684 WORD nextArena = pArena->next;
685
686 if (!(pInfo = LOCAL_GetHeap( ds ))) return;
687 LOCAL_RemoveBlock( ptr, nextArena );
688 pInfo->items--;
689 LOCAL_ShrinkArena( ds, arena, newsize );
690 }
691
692
693 /***********************************************************************
694 * LOCAL_GetFreeSpace
695 */
696 static WORD LOCAL_GetFreeSpace(WORD ds, WORD countdiscard)
697 {
698 char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
699 LOCALHEAPINFO *pInfo;
700 LOCALARENA *pArena;
701 WORD arena;
702 WORD freespace = 0;
703
704 if (!(pInfo = LOCAL_GetHeap( ds )))
705 {
706 ERR("Local heap not found\n" );
707 LOCAL_PrintHeap(ds);
708 return 0;
709 }
710 arena = pInfo->first;
711 pArena = ARENA_PTR( ptr, arena );
712 while (arena != pArena->free_next)
713 {
714 arena = pArena->free_next;
715 pArena = ARENA_PTR( ptr, arena );
716 if (pArena->size >= freespace) freespace = pArena->size;
717 }
718 /* FIXME doesn't yet calculate space that would become free if everything
719 were discarded when countdiscard == 1 */
720 if (freespace < ARENA_HEADER_SIZE) freespace = 0;
721 else freespace -= ARENA_HEADER_SIZE;
722 return freespace;
723 }
724
725
726 /***********************************************************************
727 * LOCAL_Compact
728 */
729 static UINT16 LOCAL_Compact( HANDLE16 ds, UINT16 minfree, UINT16 flags )
730 {
731 char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
732 LOCALHEAPINFO *pInfo;
733 LOCALARENA *pArena, *pMoveArena, *pFinalArena;
734 WORD arena, movearena, finalarena, table;
735 WORD count, movesize, size;
736 WORD freespace;
737 LOCALHANDLEENTRY *pEntry;
738
739 if (!(pInfo = LOCAL_GetHeap( ds )))
740 {
741 ERR("Local heap not found\n" );
742 LOCAL_PrintHeap(ds);
743 return 0;
744 }
745 TRACE("ds = %04x, minfree = %04x, flags = %04x\n",
746 ds, minfree, flags);
747 freespace = LOCAL_GetFreeSpace(ds, minfree ? 0 : 1);
748 if(freespace >= minfree || (flags & LMEM_NOCOMPACT))
749 {
750 TRACE("Returning %04x.\n", freespace);
751 return freespace;
752 }
753 TRACE("Compacting heap %04x.\n", ds);
754 table = pInfo->htable;
755 while(table)
756 {
757 pEntry = (LOCALHANDLEENTRY *)(ptr + table + sizeof(WORD));
758 for(count = *(WORD *)(ptr + table); count > 0; count--, pEntry++)
759 {
760 if((pEntry->lock == 0) && (pEntry->flags != (LMEM_DISCARDED >> 8)))
761 {
762 /* OK we can move this one if we want */
763 TRACE("handle %04x (block %04x) can be moved.\n",
764 (WORD)((char *)pEntry - ptr), pEntry->addr);
765 movearena = ARENA_HEADER(pEntry->addr - MOVEABLE_PREFIX);
766 pMoveArena = ARENA_PTR(ptr, movearena);
767 movesize = pMoveArena->next - movearena;
768 arena = pInfo->first;
769 pArena = ARENA_PTR(ptr, arena);
770 size = 0xffff;
771 finalarena = 0;
772 /* Try to find the smallest arena that will do, */
773 /* which is below us in memory */
774 for(;;)
775 {
776 arena = pArena->free_next;
777 pArena = ARENA_PTR(ptr, arena);
778 if(arena >= movearena)
779 break;
780 if(arena == pArena->free_next)
781 break;
782 if((pArena->size >= movesize) && (pArena->size < size))
783 {
784 size = pArena->size;
785 finalarena = arena;
786 }
787 }
788 if (finalarena) /* Actually got somewhere to move */
789 {
790 TRACE("Moving it to %04x.\n", finalarena);
791 pFinalArena = ARENA_PTR(ptr, finalarena);
792 size = pFinalArena->size;
793 LOCAL_RemoveFreeBlock(ptr, finalarena);
794 LOCAL_ShrinkArena( ds, finalarena, movesize );
795 /* Copy the arena to it's new location */
796 memcpy((char *)pFinalArena + ARENA_HEADER_SIZE,
797 (char *)pMoveArena + ARENA_HEADER_SIZE,
798 movesize - ARENA_HEADER_SIZE );
799 /* Free the old location */
800 LOCAL_FreeArena(ds, movearena);
801 call_notify_func(pInfo->notify, LN_MOVE,
802 (WORD)((char *)pEntry - ptr), pEntry->addr);
803 /* Update handle table entry */
804 pEntry->addr = finalarena + ARENA_HEADER_SIZE + MOVEABLE_PREFIX;
805 }
806 else if((ARENA_PTR(ptr, pMoveArena->prev & ~3)->prev & 3)
807 == LOCAL_ARENA_FREE)
808 {
809 /* Previous arena is free (but < movesize) */
810 /* so we can 'slide' movearena down into it */
811 finalarena = pMoveArena->prev & ~3;
812 LOCAL_GrowArenaDownward( ds, movearena, movesize );
813 /* Update handle table entry */
814 pEntry->addr = finalarena + ARENA_HEADER_SIZE + MOVEABLE_PREFIX;
815 }
816 }
817 }
818 table = *(WORD *)pEntry;
819 }
820 freespace = LOCAL_GetFreeSpace(ds, minfree ? 0 : 1);
821 if(freespace >= minfree || (flags & LMEM_NODISCARD))
822 {
823 TRACE("Returning %04x.\n", freespace);
824 return freespace;
825 }
826
827 table = pInfo->htable;
828 while(table)
829 {
830 pEntry = (LOCALHANDLEENTRY *)(ptr + table + sizeof(WORD));
831 for(count = *(WORD *)(ptr + table); count > 0; count--, pEntry++)
832 {
833 if(pEntry->addr && pEntry->lock == 0 &&
834 (pEntry->flags & (LMEM_DISCARDABLE >> 8)))
835 {
836 TRACE("Discarding handle %04x (block %04x).\n",
837 (char *)pEntry - ptr, pEntry->addr);
838 LOCAL_FreeArena(ds, ARENA_HEADER(pEntry->addr - MOVEABLE_PREFIX));
839 call_notify_func(pInfo->notify, LN_DISCARD, (char *)pEntry - ptr, pEntry->flags);
840 pEntry->addr = 0;
841 pEntry->flags = (LMEM_DISCARDED >> 8);
842 }
843 }
844 table = *(WORD *)pEntry;
845 }
846 return LOCAL_Compact(ds, 0xffff, LMEM_NODISCARD);
847 }
848
849
850 /***********************************************************************
851 * LOCAL_FindFreeBlock
852 */
853 static HLOCAL16 LOCAL_FindFreeBlock( HANDLE16 ds, WORD size )
854 {
855 char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
856 LOCALHEAPINFO *pInfo;
857 LOCALARENA *pArena;
858 WORD arena;
859
860 if (!(pInfo = LOCAL_GetHeap( ds )))
861 {
862 ERR("Local heap not found\n" );
863 LOCAL_PrintHeap(ds);
864 return 0;
865 }
866
867 arena = pInfo->first;
868 pArena = ARENA_PTR( ptr, arena );
869 for (;;) {
870 arena = pArena->free_next;
871 pArena = ARENA_PTR( ptr, arena );
872 if (arena == pArena->free_next) break;
873 if (pArena->size >= size) return arena;
874 }
875 TRACE("not enough space\n" );
876 LOCAL_PrintHeap(ds);
877 return 0;
878 }
879
880
881 /***********************************************************************
882 * get_heap_name
883 */
884 static const char *get_heap_name( WORD ds )
885 {
886 HINSTANCE16 inst = LoadLibrary16( "GDI" );
887 if (ds == GlobalHandleToSel16( inst ))
888 {
889 FreeLibrary16( inst );
890 return "GDI";
891 }
892 FreeLibrary16( inst );
893 inst = LoadLibrary16( "USER" );
894 if (ds == GlobalHandleToSel16( inst ))
895 {
896 FreeLibrary16( inst );
897 return "USER";
898 }
899 FreeLibrary16( inst );
900 return "local";
901 }
902
903 /***********************************************************************
904 * LOCAL_GetBlock
905 * The segment may get moved around in this function, so all callers
906 * should reset their pointer variables.
907 */
908 static HLOCAL16 LOCAL_GetBlock( HANDLE16 ds, WORD size, WORD flags )
909 {
910 char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
911 LOCALHEAPINFO *pInfo;
912 LOCALARENA *pArena;
913 WORD arena;
914
915 if (!(pInfo = LOCAL_GetHeap( ds )))
916 {
917 ERR("Local heap not found\n");
918 LOCAL_PrintHeap(ds);
919 return 0;
920 }
921
922 size += ARENA_HEADER_SIZE;
923 size = LALIGN( max( size, sizeof(LOCALARENA) ) );
924
925 #if 0
926 notify_done:
927 #endif
928 /* Find a suitable free block */
929 arena = LOCAL_FindFreeBlock( ds, size );
930 if (arena == 0) {
931 /* no space: try to make some */
932 LOCAL_Compact( ds, size, flags );
933 arena = LOCAL_FindFreeBlock( ds, size );
934 }
935 if (arena == 0) {
936 /* still no space: try to grow the segment */
937 if (!(LOCAL_GrowHeap( ds )))
938 {
939 #if 0
940 /* FIXME: doesn't work correctly yet */
941 if (call_notify_func(pInfo->notify, LN_OUTOFMEM, ds - 20, size)) /* FIXME: "size" correct ? (should indicate bytes needed) */
942 goto notify_done;
943 #endif
944 ERR( "not enough space in %s heap %04x for %d bytes\n",
945 get_heap_name(ds), ds, size );
946 return 0;
947 }
948 ptr = MapSL( MAKESEGPTR( ds, 0 ) );
949 pInfo = LOCAL_GetHeap( ds );
950 arena = LOCAL_FindFreeBlock( ds, size );
951 }
952 if (arena == 0) {
953 ERR( "not enough space in %s heap %04x for %d bytes\n",
954 get_heap_name(ds), ds, size );
955 #if 0
956 /* FIXME: "size" correct ? (should indicate bytes needed) */
957 if (call_notify_func(pInfo->notify, LN_OUTOFMEM, ds, size)) goto notify_done;
958 #endif
959 return 0;
960 }
961
962 /* Make a block out of the free arena */
963 pArena = ARENA_PTR( ptr, arena );
964 TRACE("size = %04x, arena %04x size %04x\n", size, arena, pArena->size );
965 LOCAL_RemoveFreeBlock( ptr, arena );
966 LOCAL_ShrinkArena( ds, arena, size );
967
968 if (flags & LMEM_ZEROINIT)
969 memset((char *)pArena + ARENA_HEADER_SIZE, 0, size-ARENA_HEADER_SIZE);
970 return arena + ARENA_HEADER_SIZE;
971 }
972
973
974 /***********************************************************************
975 * LOCAL_NewHTable
976 */
977 static BOOL16 LOCAL_NewHTable( HANDLE16 ds )
978 {
979 char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
980 LOCALHEAPINFO *pInfo;
981 LOCALHANDLEENTRY *pEntry;
982 HLOCAL16 handle;
983 int i;
984
985 TRACE("\n" );
986 if (!(pInfo = LOCAL_GetHeap( ds )))
987 {
988 ERR("Local heap not found\n");
989 LOCAL_PrintHeap(ds);
990 return FALSE;
991 }
992
993 if (!(handle = LOCAL_GetBlock( ds, pInfo->hdelta * sizeof(LOCALHANDLEENTRY)
994 + 2 * sizeof(WORD), LMEM_FIXED )))
995 return FALSE;
996 if (!(ptr = MapSL( MAKESEGPTR( ds, 0 ) )))
997 ERR("ptr == NULL after GetBlock.\n");
998 if (!(pInfo = LOCAL_GetHeap( ds )))
999 ERR("pInfo == NULL after GetBlock.\n");
1000
1001 /* Fill the entry table */
1002
1003 *(WORD *)(ptr + handle) = pInfo->hdelta;
1004 pEntry = (LOCALHANDLEENTRY *)(ptr + handle + sizeof(WORD));
1005 for (i = pInfo->hdelta; i > 0; i--, pEntry++) {
1006 pEntry->lock = pEntry->flags = 0xff;
1007 pEntry->addr = 0;
1008 }
1009 *(WORD *)pEntry = pInfo->htable;
1010 pInfo->htable = handle;
1011 return TRUE;
1012 }
1013
1014
1015 /***********************************************************************
1016 * LOCAL_GetNewHandleEntry
1017 */
1018 static HLOCAL16 LOCAL_GetNewHandleEntry( HANDLE16 ds )
1019 {
1020 char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
1021 LOCALHEAPINFO *pInfo;
1022 LOCALHANDLEENTRY *pEntry = NULL;
1023 WORD table;
1024
1025 if (!(pInfo = LOCAL_GetHeap( ds )))
1026 {
1027 ERR("Local heap not found\n");
1028 LOCAL_PrintHeap(ds);
1029 return 0;
1030 }
1031
1032 /* Find a free slot in existing tables */
1033
1034 table = pInfo->htable;
1035 while (table)
1036 {
1037 WORD count = *(WORD *)(ptr + table);
1038 pEntry = (LOCALHANDLEENTRY *)(ptr + table + sizeof(WORD));
1039 for (; count > 0; count--, pEntry++)
1040 if (pEntry->lock == 0xff) break;
1041 if (count) break;
1042 table = *(WORD *)pEntry;
1043 }
1044
1045 if (!table) /* We need to create a new table */
1046 {
1047 if (!LOCAL_NewHTable( ds )) return 0;
1048 ptr = MapSL( MAKESEGPTR( ds, 0 ) );
1049 pInfo = LOCAL_GetHeap( ds );
1050 pEntry = (LOCALHANDLEENTRY *)(ptr + pInfo->htable + sizeof(WORD));
1051 }
1052
1053 /* Now allocate this entry */
1054
1055 pEntry->lock = 0;
1056 pEntry->flags = 0;
1057 TRACE("(%04x): %04x\n", ds, ((char *)pEntry - ptr) );
1058 return (HLOCAL16)((char *)pEntry - ptr);
1059 }
1060
1061
1062 /***********************************************************************
1063 * LOCAL_FreeHandleEntry
1064 *
1065 * Free a handle table entry.
1066 */
1067 static void LOCAL_FreeHandleEntry( HANDLE16 ds, HLOCAL16 handle )
1068 {
1069 char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
1070 LOCALHANDLEENTRY *pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1071 LOCALHEAPINFO *pInfo;
1072 WORD *pTable;
1073 WORD table, count, i;
1074
1075 if (!(pInfo = LOCAL_GetHeap( ds ))) return;
1076
1077 /* Find the table where this handle comes from */
1078
1079 pTable = &pInfo->htable;
1080 while (*pTable)
1081 {
1082 WORD size = (*(WORD *)(ptr + *pTable)) * sizeof(LOCALHANDLEENTRY);
1083 if ((handle >= *pTable + sizeof(WORD)) &&
1084 (handle < *pTable + sizeof(WORD) + size)) break; /* Found it */
1085 pTable = (WORD *)(ptr + *pTable + sizeof(WORD) + size);
1086 }
1087 if (!*pTable)
1088 {
1089 ERR("Invalid entry %04x\n", handle);
1090 LOCAL_PrintHeap( ds );
1091 return;
1092 }
1093
1094 /* Make the entry free */
1095
1096 pEntry->addr = 0; /* just in case */
1097 pEntry->lock = 0xff;
1098 pEntry->flags = 0xff;
1099 /* Now check if all entries in this table are free */
1100
1101 table = *pTable;
1102 pEntry = (LOCALHANDLEENTRY *)(ptr + table + sizeof(WORD));
1103 count = *(WORD *)(ptr + table);
1104 for (i = count; i > 0; i--, pEntry++) if (pEntry->lock != 0xff) return;
1105
1106 /* Remove the table from the linked list and free it */
1107
1108 TRACE("(%04x): freeing table %04x\n", ds, table);
1109 *pTable = *(WORD *)pEntry;
1110 LOCAL_FreeArena( ds, ARENA_HEADER( table ) );
1111 }
1112
1113
1114 /***********************************************************************
1115 * LocalFree (KERNEL.7)
1116 */
1117 HLOCAL16 WINAPI LocalFree16( HLOCAL16 handle )
1118 {
1119 HANDLE16 ds = CURRENT_DS;
1120 char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
1121
1122 TRACE("%04x ds=%04x\n", handle, ds );
1123
1124 if (!handle) { WARN("Handle is 0.\n" ); return 0; }
1125 if (HANDLE_FIXED( handle ))
1126 {
1127 if (!LOCAL_FreeArena( ds, ARENA_HEADER( handle ) )) return 0; /* OK */
1128 else return handle; /* couldn't free it */
1129 }
1130 else
1131 {
1132 LOCALHANDLEENTRY *pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1133 if (pEntry->flags != (LMEM_DISCARDED >> 8))
1134 {
1135 TRACE("real block at %04x\n", pEntry->addr );
1136 if (LOCAL_FreeArena( ds, ARENA_HEADER(pEntry->addr - MOVEABLE_PREFIX) ))
1137 return handle; /* couldn't free it */
1138 }
1139 LOCAL_FreeHandleEntry( ds, handle );
1140 return 0; /* OK */
1141 }
1142 }
1143
1144
1145 /***********************************************************************
1146 * LocalAlloc (KERNEL.5)
1147 */
1148 HLOCAL16 WINAPI LocalAlloc16( UINT16 flags, WORD size )
1149 {
1150 HANDLE16 ds = CURRENT_DS;
1151 HLOCAL16 handle = 0;
1152 char *ptr;
1153
1154 TRACE("%04x %d ds=%04x\n", flags, size, ds );
1155
1156 if(size > 0 && size <= 4) size = 5;
1157 if (flags & LMEM_MOVEABLE)
1158 {
1159 LOCALHANDLEENTRY *plhe;
1160 HLOCAL16 hmem;
1161
1162 if(size)
1163 {
1164 if (!(hmem = LOCAL_GetBlock( ds, size + MOVEABLE_PREFIX, flags )))
1165 goto exit;
1166 }
1167 else /* We just need to allocate a discarded handle */
1168 hmem = 0;
1169 if (!(handle = LOCAL_GetNewHandleEntry( ds )))
1170 {
1171 WARN("Couldn't get handle.\n");
1172 if(hmem)
1173 LOCAL_FreeArena( ds, ARENA_HEADER(hmem) );
1174 goto exit;
1175 }
1176 ptr = MapSL( MAKESEGPTR( ds, 0 ) );
1177 plhe = (LOCALHANDLEENTRY *)(ptr + handle);
1178 plhe->lock = 0;
1179 if(hmem)
1180 {
1181 plhe->addr = hmem + MOVEABLE_PREFIX;
1182 plhe->flags = (BYTE)((flags & 0x0f00) >> 8);
1183 *(HLOCAL16 *)(ptr + hmem) = handle;
1184 }
1185 else
1186 {
1187 plhe->addr = 0;
1188 plhe->flags = LMEM_DISCARDED >> 8;
1189 }
1190 }
1191 else /* FIXED */
1192 {
1193 if(size) handle = LOCAL_GetBlock( ds, size, flags );
1194 }
1195
1196 exit:
1197 CURRENT_STACK16->ecx = handle; /* must be returned in cx too */
1198 return handle;
1199 }
1200
1201
1202 /***********************************************************************
1203 * LocalReAlloc (KERNEL.6)
1204 */
1205 HLOCAL16 WINAPI LocalReAlloc16( HLOCAL16 handle, WORD size, UINT16 flags )
1206 {
1207 HANDLE16 ds = CURRENT_DS;
1208 char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
1209 LOCALHEAPINFO *pInfo;
1210 LOCALARENA *pArena, *pNext;
1211 LOCALHANDLEENTRY *pEntry = NULL;
1212 WORD arena, oldsize;
1213 HLOCAL16 hmem, blockhandle;
1214 LONG nextarena;
1215
1216 if (!handle) return 0;
1217 if(HANDLE_MOVEABLE(handle) &&
1218 ((LOCALHANDLEENTRY *)(ptr + handle))->lock == 0xff) /* An unused handle */
1219 return 0;
1220
1221 TRACE("%04x %d %04x ds=%04x\n", handle, size, flags, ds );
1222 if (!(pInfo = LOCAL_GetHeap( ds ))) return 0;
1223
1224 if (HANDLE_FIXED( handle ))
1225 blockhandle = handle;
1226 else
1227 {
1228 pEntry = (LOCALHANDLEENTRY *) (ptr + handle);
1229 if(pEntry->flags == (LMEM_DISCARDED >> 8))
1230 {
1231 HLOCAL16 hl;
1232 if(pEntry->addr)
1233 WARN("Dicarded block has non-zero addr.\n");
1234 TRACE("ReAllocating discarded block\n");
1235 if(size <= 4) size = 5;
1236 if (!(hl = LOCAL_GetBlock( ds, size + MOVEABLE_PREFIX, flags)))
1237 return 0;
1238 ptr = MapSL( MAKESEGPTR( ds, 0 ) ); /* Reload ptr */
1239 pEntry = (LOCALHANDLEENTRY *) (ptr + handle);
1240 pEntry->addr = hl + MOVEABLE_PREFIX;
1241 pEntry->flags = 0;
1242 pEntry->lock = 0;
1243 *(HLOCAL16 *)(ptr + hl) = handle;
1244 return handle;
1245 }
1246 if (((blockhandle = pEntry->addr - MOVEABLE_PREFIX) & 3) != 0)
1247 {
1248 ERR("(%04x,%04x): invalid handle\n",
1249 ds, handle );
1250 return 0;
1251 }
1252 if (*(HLOCAL16 *)(ptr + blockhandle) != handle) {
1253 ERR("Back ptr to handle is invalid\n");
1254 return 0;
1255 }
1256 }
1257
1258 if (flags & LMEM_MODIFY)
1259 {
1260 if (HANDLE_MOVEABLE(handle))
1261 {
1262 pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1263 pEntry->flags = (flags & 0x0f00) >> 8;
1264 TRACE("Changing flags to %x.\n", pEntry->flags);
1265 }
1266 return handle;
1267 }
1268
1269 if (!size)
1270 {
1271 if (flags & LMEM_MOVEABLE)
1272 {
1273 if (HANDLE_FIXED(handle))
1274 {
1275 TRACE("Freeing fixed block.\n");
1276 return LocalFree16( handle );
1277 }
1278 else /* Moveable block */
1279 {
1280 pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1281 if (pEntry->lock == 0)
1282 {
1283 /* discards moveable blocks */
1284 TRACE("Discarding block\n");
1285 LOCAL_FreeArena(ds, ARENA_HEADER(pEntry->addr - MOVEABLE_PREFIX));
1286 pEntry->addr = 0;
1287 pEntry->flags = (LMEM_DISCARDED >> 8);
1288 return handle;
1289 }
1290 }
1291 return 0;
1292 }
1293 else if(flags == 0)
1294 {
1295 pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1296 if (pEntry->lock == 0)
1297 {
1298 /* Frees block */
1299 return LocalFree16( handle );
1300 }
1301 }
1302 return 0;
1303 }
1304
1305 arena = ARENA_HEADER( blockhandle );
1306 TRACE("arena is %04x\n", arena );
1307 pArena = ARENA_PTR( ptr, arena );
1308
1309 if(size <= 4) size = 5;
1310 if(HANDLE_MOVEABLE(handle)) size += MOVEABLE_PREFIX;
1311 oldsize = pArena->next - arena - ARENA_HEADER_SIZE;
1312 nextarena = LALIGN(blockhandle + size);
1313
1314 /* Check for size reduction */
1315
1316 if (nextarena <= pArena->next)
1317 {
1318 TRACE("size reduction, making new free block\n");
1319 LOCAL_ShrinkArena(ds, arena, nextarena - arena);
1320 TRACE("returning %04x\n", handle );
1321 return handle;
1322 }
1323
1324 /* Check if the next block is free and large enough */
1325
1326 pNext = ARENA_PTR( ptr, pArena->next );
1327 if (((pNext->prev & 3) == LOCAL_ARENA_FREE) &&
1328 (nextarena <= pNext->next))
1329 {
1330 TRACE("size increase, making new free block\n");
1331 LOCAL_GrowArenaUpward(ds, arena, nextarena - arena);
1332 if (flags & LMEM_ZEROINIT)
1333 {
1334 char *oldend = (char *)pArena + ARENA_HEADER_SIZE + oldsize;
1335 char *newend = ptr + pArena->next;
1336 TRACE("Clearing memory from %p to %p (DS -> %p)\n", oldend, newend, ptr);
1337 memset(oldend, 0, newend - oldend);
1338 }
1339
1340 TRACE("returning %04x\n", handle );
1341 return handle;
1342 }
1343
1344 /* Now we have to allocate a new block, but not if (fixed block or locked
1345 block) and no LMEM_MOVEABLE */
1346
1347 if (!(flags & LMEM_MOVEABLE))
1348 {
1349 if (HANDLE_FIXED(handle))
1350 {
1351 ERR("Needed to move fixed block, but LMEM_MOVEABLE not specified.\n");
1352 return 0;
1353 }
1354 else
1355 {
1356 if(((LOCALHANDLEENTRY *)(ptr + handle))->lock != 0)
1357 {
1358 ERR("Needed to move locked block, but LMEM_MOVEABLE not specified.\n");
1359 return 0;
1360 }
1361 }
1362 }
1363
1364 hmem = LOCAL_GetBlock( ds, size, flags );
1365 ptr = MapSL( MAKESEGPTR( ds, 0 )); /* Reload ptr */
1366 if(HANDLE_MOVEABLE(handle)) /* LOCAL_GetBlock might have triggered */
1367 { /* a compaction, which might in turn have */
1368 blockhandle = pEntry->addr - MOVEABLE_PREFIX; /* moved the very block we are resizing */
1369 arena = ARENA_HEADER( blockhandle ); /* thus, we reload arena, too */
1370 }
1371 if (!hmem)
1372 {
1373 /* Remove the block from the heap and try again */
1374 LPSTR buffer = HeapAlloc( GetProcessHeap(), 0, oldsize );
1375 if (!buffer) return 0;
1376 memcpy( buffer, ptr + arena + ARENA_HEADER_SIZE, oldsize );
1377 LOCAL_FreeArena( ds, arena );
1378 if (!(hmem = LOCAL_GetBlock( ds, size, flags )))
1379 {
1380 if (!(hmem = LOCAL_GetBlock( ds, oldsize, flags )))
1381 {
1382 ERR("Can't restore saved block\n" );
1383 HeapFree( GetProcessHeap(), 0, buffer );
1384 return 0;
1385 }
1386 size = oldsize;
1387 }
1388 ptr = MapSL( MAKESEGPTR( ds, 0 ) ); /* Reload ptr */
1389 memcpy( ptr + hmem, buffer, oldsize );
1390 HeapFree( GetProcessHeap(), 0, buffer );
1391 }
1392 else
1393 {
1394 memcpy( ptr + hmem, ptr + (arena + ARENA_HEADER_SIZE), oldsize );
1395 LOCAL_FreeArena( ds, arena );
1396 }
1397 if (HANDLE_MOVEABLE( handle ))
1398 {
1399 TRACE("fixing handle\n");
1400 pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1401 pEntry->addr = hmem + MOVEABLE_PREFIX;
1402 /* Back ptr should still be correct */
1403 if(*(HLOCAL16 *)(ptr + hmem) != handle)
1404 ERR("back ptr is invalid.\n");
1405 hmem = handle;
1406 }
1407 if (size == oldsize) hmem = 0; /* Realloc failed */
1408 TRACE("returning %04x\n", hmem );
1409 return hmem;
1410 }
1411
1412
1413 /***********************************************************************
1414 * LOCAL_InternalLock
1415 */
1416 static HLOCAL16 LOCAL_InternalLock( LPSTR heap, HLOCAL16 handle )
1417 {
1418 HLOCAL16 old_handle = handle;
1419
1420 if (HANDLE_MOVEABLE(handle))
1421 {
1422 LOCALHANDLEENTRY *pEntry = (LOCALHANDLEENTRY *)(heap + handle);
1423 if (pEntry->flags == (LMEM_DISCARDED >> 8)) return 0;
1424 if (pEntry->lock < 0xfe) pEntry->lock++;
1425 handle = pEntry->addr;
1426 }
1427 TRACE("%04x returning %04x\n", old_handle, handle );
1428 return handle;
1429 }
1430
1431
1432 /***********************************************************************
1433 * LocalUnlock (KERNEL.9)
1434 */
1435 BOOL16 WINAPI LocalUnlock16( HLOCAL16 handle )
1436 {
1437 HANDLE16 ds = CURRENT_DS;
1438 char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
1439
1440 TRACE("%04x\n", handle );
1441 if (HANDLE_MOVEABLE(handle))
1442 {
1443 LOCALHANDLEENTRY *pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1444 if (!pEntry->lock || (pEntry->lock == 0xff)) return FALSE;
1445 /* For moveable block, return the new lock count */
1446 /* (see _Windows_Internals_ p. 197) */
1447 return --pEntry->lock;
1448 }
1449 else return FALSE;
1450 }
1451
1452
1453 /***********************************************************************
1454 * LocalSize (KERNEL.10)
1455 */
1456 UINT16 WINAPI LocalSize16( HLOCAL16 handle )
1457 {
1458 HANDLE16 ds = CURRENT_DS;
1459 char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
1460 LOCALARENA *pArena;
1461
1462 TRACE("%04x ds=%04x\n", handle, ds );
1463
1464 if (!handle) return 0;
1465 if (HANDLE_MOVEABLE( handle ))
1466 {
1467 handle = *(WORD *)(ptr + handle);
1468 if (!handle) return 0;
1469 pArena = ARENA_PTR( ptr, ARENA_HEADER(handle - MOVEABLE_PREFIX) );
1470 }
1471 else
1472 pArena = ARENA_PTR( ptr, ARENA_HEADER(handle) );
1473
1474 return pArena->next - handle;
1475 }
1476
1477
1478 /***********************************************************************
1479 * LocalFlags (KERNEL.12)
1480 */
1481 UINT16 WINAPI LocalFlags16( HLOCAL16 handle )
1482 {
1483 HANDLE16 ds = CURRENT_DS;
1484 char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
1485
1486 if (HANDLE_MOVEABLE(handle))
1487 {
1488 LOCALHANDLEENTRY *pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1489 TRACE("(%04x,%04x): returning %04x\n",
1490 ds, handle, pEntry->lock | (pEntry->flags << 8) );
1491 return pEntry->lock | (pEntry->flags << 8);
1492 }
1493 else
1494 {
1495 TRACE("(%04x,%04x): returning 0\n",
1496 ds, handle );
1497 return 0;
1498 }
1499 }
1500
1501
1502 /***********************************************************************
1503 * LocalHeapSize (KERNEL.162)
1504 */
1505 WORD WINAPI LocalHeapSize16(void)
1506 {
1507 HANDLE16 ds = CURRENT_DS;
1508 LOCALHEAPINFO *pInfo = LOCAL_GetHeap( ds );
1509 return pInfo ? pInfo->last - pInfo->first : 0;
1510 }
1511
1512
1513 /***********************************************************************
1514 * LocalCountFree (KERNEL.161)
1515 */
1516 WORD WINAPI LocalCountFree16(void)
1517 {
1518 HANDLE16 ds = CURRENT_DS;
1519 WORD arena, total;
1520 LOCALARENA *pArena;
1521 LOCALHEAPINFO *pInfo;
1522 char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
1523
1524 if (!(pInfo = LOCAL_GetHeap( ds )))
1525 {
1526 ERR("(%04x): Local heap not found\n", ds );
1527 LOCAL_PrintHeap( ds );
1528 return 0;
1529 }
1530
1531 total = 0;
1532 arena = pInfo->first;
1533 pArena = ARENA_PTR( ptr, arena );
1534 for (;;)
1535 {
1536 arena = pArena->free_next;
1537 pArena = ARENA_PTR( ptr, arena );
1538 if (arena == pArena->free_next) break;
1539 total += pArena->size;
1540 }
1541 TRACE("(%04x): returning %d\n", ds, total);
1542 return total;
1543 }
1544
1545
1546 /***********************************************************************
1547 * LocalHandle (KERNEL.11)
1548 */
1549 HLOCAL16 WINAPI LocalHandle16( WORD addr )
1550 {
1551 HANDLE16 ds = CURRENT_DS;
1552 char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
1553 LOCALHEAPINFO *pInfo;
1554 WORD table;
1555
1556 if (!(pInfo = LOCAL_GetHeap( ds )))
1557 {
1558 ERR("(%04x): Local heap not found\n", ds );
1559 LOCAL_PrintHeap( ds );
1560 return 0;
1561 }
1562
1563 /* Find the address in the entry tables */
1564
1565 table = pInfo->htable;
1566 while (table)
1567 {
1568 WORD count = *(WORD *)(ptr + table);
1569 LOCALHANDLEENTRY *pEntry = (LOCALHANDLEENTRY*)(ptr+table+sizeof(WORD));
1570 for (; count > 0; count--, pEntry++)
1571 if (pEntry->addr == addr) return (HLOCAL16)((char *)pEntry - ptr);
1572 table = *(WORD *)pEntry;
1573 }
1574
1575 return (HLOCAL16)addr; /* Fixed block handle is addr */
1576 }
1577
1578
1579
1580
1581 /***********************************************************************
1582 * LocalLock (KERNEL.8)
1583 *
1584 * Note: only the offset part of the pointer is returned by the relay code.
1585 */
1586 SEGPTR WINAPI LocalLock16( HLOCAL16 handle )
1587 {
1588 WORD ds = CURRENT_DS;
1589 char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
1590 return MAKESEGPTR( ds, LOCAL_InternalLock( ptr, handle ) );
1591 }
1592
1593
1594 /***********************************************************************
1595 * LocalCompact (KERNEL.13)
1596 */
1597 UINT16 WINAPI LocalCompact16( UINT16 minfree )
1598 {
1599 TRACE("%04x\n", minfree );
1600 return LOCAL_Compact( CURRENT_DS, minfree, 0 );
1601 }
1602
1603
1604 /***********************************************************************
1605 * LocalNotify (KERNEL.14)
1606 *
1607 * Installs a callback function that is called for local memory events
1608 * Callback function prototype is
1609 * BOOL16 NotifyFunc(WORD wMsg, HLOCAL16 hMem, WORD wArg)
1610 * wMsg:
1611 * - LN_OUTOFMEM
1612 * NotifyFunc seems to be responsible for allocating some memory,
1613 * returns TRUE for success.
1614 * wArg = number of bytes needed additionally
1615 * - LN_MOVE
1616 * hMem = handle; wArg = old mem location
1617 * - LN_DISCARD
1618 * NotifyFunc seems to be strongly encouraged to return TRUE,
1619 * otherwise LogError() gets called.
1620 * hMem = handle; wArg = flags
1621 */
1622 FARPROC16 WINAPI LocalNotify16( FARPROC16 func )
1623 {
1624 LOCALHEAPINFO *pInfo;
1625 FARPROC16 oldNotify;
1626 HANDLE16 ds = CURRENT_DS;
1627
1628 if (!(pInfo = LOCAL_GetHeap( ds )))
1629 {
1630 ERR("(%04x): Local heap not found\n", ds );
1631 LOCAL_PrintHeap( ds );
1632 return 0;
1633 }
1634 TRACE("(%04x): %p\n", ds, func );
1635 FIXME("Half implemented\n");
1636 oldNotify = pInfo->notify;
1637 pInfo->notify = func;
1638 return oldNotify;
1639 }
1640
1641
1642 /***********************************************************************
1643 * LocalShrink (KERNEL.121)
1644 */
1645 UINT16 WINAPI LocalShrink16( HGLOBAL16 handle, UINT16 newsize )
1646 {
1647 TRACE("%04x %04x\n", handle, newsize );
1648 return 0;
1649 }
1650
1651
1652 /***********************************************************************
1653 * GetHeapSpaces (KERNEL.138)
1654 */
1655 DWORD WINAPI GetHeapSpaces16( HMODULE16 module )
1656 {
1657 NE_MODULE *pModule;
1658 WORD oldDS = CURRENT_DS;
1659 DWORD spaces;
1660
1661 if (!(pModule = NE_GetPtr( module ))) return 0;
1662 CURRENT_DS = GlobalHandleToSel16((NE_SEG_TABLE( pModule ) + pModule->ne_autodata - 1)->hSeg);
1663 spaces = MAKELONG( LocalCountFree16(), LocalHeapSize16() );
1664 CURRENT_DS = oldDS;
1665 return spaces;
1666 }
1667
1668
1669 /***********************************************************************
1670 * LocalHandleDelta (KERNEL.310)
1671 */
1672 WORD WINAPI LocalHandleDelta16( WORD delta )
1673 {
1674 LOCALHEAPINFO *pInfo;
1675
1676 if (!(pInfo = LOCAL_GetHeap( CURRENT_DS )))
1677 {
1678 ERR("Local heap not found\n");
1679 LOCAL_PrintHeap( CURRENT_DS );
1680 return 0;
1681 }
1682 if (delta) pInfo->hdelta = delta;
1683 TRACE("returning %04x\n", pInfo->hdelta);
1684 return pInfo->hdelta;
1685 }
1686
1687
1688 /***********************************************************************
1689 * LocalInfo (TOOLHELP.56)
1690 */
1691 BOOL16 WINAPI LocalInfo16( LOCALINFO *pLocalInfo, HGLOBAL16 handle )
1692 {
1693 LOCALHEAPINFO *pInfo = LOCAL_GetHeap(SELECTOROF(WOWGlobalLock16(handle)));
1694 if (!pInfo) return FALSE;
1695 pLocalInfo->wcItems = pInfo->items;
1696 return TRUE;
1697 }
1698
1699
1700 /***********************************************************************
1701 * LocalFirst (TOOLHELP.57)
1702 */
1703 BOOL16 WINAPI LocalFirst16( LOCALENTRY *pLocalEntry, HGLOBAL16 handle )
1704 {
1705 WORD ds = GlobalHandleToSel16( handle );
1706 char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
1707 LOCALHEAPINFO *pInfo = LOCAL_GetHeap( ds );
1708 if (!pInfo) return FALSE;
1709
1710 pLocalEntry->hHandle = pInfo->first + ARENA_HEADER_SIZE;
1711 pLocalEntry->wAddress = pLocalEntry->hHandle;
1712 pLocalEntry->wFlags = LF_FIXED;
1713 pLocalEntry->wcLock = 0;
1714 pLocalEntry->wType = LT_NORMAL;
1715 pLocalEntry->hHeap = handle;
1716 pLocalEntry->wHeapType = NORMAL_HEAP;
1717 pLocalEntry->wNext = ARENA_PTR(ptr,pInfo->first)->next;
1718 pLocalEntry->wSize = pLocalEntry->wNext - pLocalEntry->hHandle;
1719 return TRUE;
1720 }
1721
1722
1723 /***********************************************************************
1724 * LocalNext (TOOLHELP.58)
1725 */
1726 BOOL16 WINAPI LocalNext16( LOCALENTRY *pLocalEntry )
1727 {
1728 WORD ds = GlobalHandleToSel16( pLocalEntry->hHeap );
1729 char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
1730 LOCALARENA *pArena;
1731
1732 if (!LOCAL_GetHeap( ds )) return FALSE;
1733 if (!pLocalEntry->wNext) return FALSE;
1734 pArena = ARENA_PTR( ptr, pLocalEntry->wNext );
1735
1736 pLocalEntry->hHandle = pLocalEntry->wNext + ARENA_HEADER_SIZE;
1737 pLocalEntry->wAddress = pLocalEntry->hHandle;
1738 pLocalEntry->wFlags = (pArena->prev & 3) + 1;
1739 pLocalEntry->wcLock = 0;
1740 pLocalEntry->wType = LT_NORMAL;
1741 if (pArena->next != pLocalEntry->wNext) /* last one? */
1742 pLocalEntry->wNext = pArena->next;
1743 else
1744 pLocalEntry->wNext = 0;
1745 pLocalEntry->wSize = pLocalEntry->wNext - pLocalEntry->hHandle;
1746 return TRUE;
1747 }
1748
1749
1750 /***********************************************************************
1751 * 32-bit local heap functions (Win95; undocumented)
1752 */
1753
1754 /***********************************************************************
1755 * K208 (KERNEL.208)
1756 */
1757 HANDLE WINAPI Local32Init16( WORD segment, DWORD tableSize,
1758 DWORD heapSize, DWORD flags )
1759 {
1760 DWORD totSize, segSize = 0;
1761 LPBYTE base;
1762 LOCAL32HEADER *header;
1763 HANDLE heap;
1764 WORD *selectorTable;
1765 WORD selectorEven, selectorOdd;
1766 int i, nrBlocks;
1767
1768 /* Determine new heap size */
1769
1770 if ( segment )
1771 {
1772 if ( (segSize = GetSelectorLimit16( segment )) == 0 )
1773 return 0;
1774 else
1775 segSize++;
1776 }
1777
1778 if ( heapSize == (DWORD)-1 )
1779 heapSize = 1024*1024; /* FIXME */
1780
1781 heapSize = (heapSize + 0xffff) & 0xffff0000;
1782 segSize = (segSize + 0x0fff) & 0xfffff000;
1783 totSize = segSize + HTABLE_SIZE + heapSize;
1784
1785
1786 /* Allocate memory and initialize heap */
1787
1788 if ( !(base = VirtualAlloc( NULL, totSize, MEM_RESERVE, PAGE_READWRITE )) )
1789 return 0;
1790
1791 if ( !VirtualAlloc( base, segSize + HTABLE_PAGESIZE,
1792 MEM_COMMIT, PAGE_READWRITE ) )
1793 {
1794 VirtualFree( base, 0, MEM_RELEASE );
1795 return 0;
1796 }
1797
1798 if (!(heap = RtlCreateHeap( 0, base + segSize + HTABLE_SIZE, heapSize, 0x10000, NULL, NULL )))
1799 {
1800 VirtualFree( base, 0, MEM_RELEASE );
1801 return 0;
1802 }
1803
1804
1805 /* Set up header and handle table */
1806
1807 header = (LOCAL32HEADER *)(base + segSize);
1808 header->base = base;
1809 header->limit = HTABLE_PAGESIZE-1;
1810 header->flags = 0;
1811 header->magic = LOCAL32_MAGIC;
1812 header->heap = heap;
1813
1814 header->freeListFirst[0] = sizeof(LOCAL32HEADER);
1815 header->freeListLast[0] = HTABLE_PAGESIZE - 4;
1816 header->freeListSize[0] = (HTABLE_PAGESIZE - sizeof(LOCAL32HEADER)) / 4;
1817
1818 for (i = header->freeListFirst[0]; i < header->freeListLast[0]; i += 4)
1819 *(DWORD *)((LPBYTE)header + i) = i+4;
1820
1821 header->freeListFirst[1] = 0xffff;
1822
1823
1824 /* Set up selector table */
1825
1826 nrBlocks = (totSize + 0x7fff) >> 15;
1827 selectorTable = HeapAlloc( header->heap, 0, nrBlocks * 2 );
1828 selectorEven = SELECTOR_AllocBlock( base, totSize, WINE_LDT_FLAGS_DATA );
1829 selectorOdd = SELECTOR_AllocBlock( base + 0x8000, totSize - 0x8000, WINE_LDT_FLAGS_DATA );
1830 if ( !selectorTable || !selectorEven || !selectorOdd )
1831 {
1832 HeapFree( header->heap, 0, selectorTable );
1833 if ( selectorEven ) SELECTOR_FreeBlock( selectorEven );
1834 if ( selectorOdd ) SELECTOR_FreeBlock( selectorOdd );
1835 HeapDestroy( header->heap );
1836 VirtualFree( base, 0, MEM_RELEASE );
1837 return 0;
1838 }
1839
1840 header->selectorTableOffset = (LPBYTE)selectorTable - header->base;
1841 header->selectorTableSize = nrBlocks * 4; /* ??? Win95 does it this way! */
1842 header->selectorDelta = selectorEven - selectorOdd;
1843 header->segment = segment? segment : selectorEven;
1844
1845 for (i = 0; i < nrBlocks; i++)
1846 selectorTable[i] = (i & 1)? selectorOdd + ((i >> 1) << __AHSHIFT)
1847 : selectorEven + ((i >> 1) << __AHSHIFT);
1848
1849 /* Move old segment */
1850
1851 if ( segment )
1852 {
1853 /* FIXME: This is somewhat ugly and relies on implementation
1854 details about 16-bit global memory handles ... */
1855
1856 LPBYTE oldBase = (LPBYTE)GetSelectorBase( segment );
1857 memcpy( base, oldBase, segSize );
1858 GLOBAL_MoveBlock( segment, base, totSize );
1859 HeapFree( GetProcessHeap(), 0, oldBase );
1860 }
1861
1862 return (HANDLE)header;
1863 }
1864
1865 /***********************************************************************
1866 * Local32_SearchHandle
1867 */
1868 static LPDWORD Local32_SearchHandle( LOCAL32HEADER *header, DWORD addr )
1869 {
1870 LPDWORD handle;
1871
1872 for ( handle = (LPDWORD)((LPBYTE)header + sizeof(LOCAL32HEADER));
1873 handle < (LPDWORD)((LPBYTE)header + header->limit);
1874 handle++)
1875 {
1876 if (*handle == addr)
1877 return handle;
1878 }
1879
1880 return NULL;
1881 }
1882
1883 /***********************************************************************
1884 * Local32_ToHandle
1885 */
1886 static VOID Local32_ToHandle( LOCAL32HEADER *header, INT16 type,
1887 DWORD addr, LPDWORD *handle, LPBYTE *ptr )
1888 {
1889 *handle = NULL;
1890 *ptr = NULL;
1891
1892 switch (type)
1893 {
1894 case -2: /* 16:16 pointer, no handles */
1895 *ptr = MapSL( addr );
1896 *handle = (LPDWORD)*ptr;
1897 break;
1898
1899 case -1: /* 32-bit offset, no handles */
1900 *ptr = header->base + addr;
1901 *handle = (LPDWORD)*ptr;
1902 break;
1903
1904 case 0: /* handle */
1905 if ( addr >= sizeof(LOCAL32HEADER)
1906 && addr < header->limit && !(addr & 3)
1907 && *(LPDWORD)((LPBYTE)header + addr) >= HTABLE_SIZE )
1908 {
1909 *handle = (LPDWORD)((LPBYTE)header + addr);
1910 *ptr = header->base + **handle;
1911 }
1912 break;
1913
1914 case 1: /* 16:16 pointer */
1915 *ptr = MapSL( addr );
1916 *handle = Local32_SearchHandle( header, *ptr - header->base );
1917 break;
1918
1919 case 2: /* 32-bit offset */
1920 *ptr = header->base + addr;
1921 *handle = Local32_SearchHandle( header, *ptr - header->base );
1922 break;
1923 }
1924 }
1925
1926 /***********************************************************************
1927 * Local32_FromHandle
1928 */
1929 static VOID Local32_FromHandle( LOCAL32HEADER *header, INT16 type,
1930 DWORD *addr, LPDWORD handle, LPBYTE ptr )
1931 {
1932 *addr = 0;
1933 switch (type)
1934 {
1935 case -2: /* 16:16 pointer */
1936 case 1:
1937 {
1938 WORD *selTable = (LPWORD)(header->base + header->selectorTableOffset);
1939 DWORD offset = ptr - header->base;
1940 *addr = MAKELONG( offset & 0x7fff, selTable[offset >> 15] );
1941 }
1942 break;
1943
1944 case -1: /* 32-bit offset */
1945 case 2:
1946 *addr = ptr - header->base;
1947 break;
1948
1949 case 0: /* handle */
1950 *addr = (LPBYTE)handle - (LPBYTE)header;
1951 break;
1952 }
1953 }
1954
1955 /***********************************************************************
1956 * K209 (KERNEL.209)
1957 */
1958 DWORD WINAPI Local32Alloc16( HANDLE heap, DWORD size, INT16 type, DWORD flags )
1959 {
1960 LOCAL32HEADER *header = (LOCAL32HEADER *)heap;
1961 LPDWORD handle;
1962 LPBYTE ptr;
1963 DWORD addr;
1964
1965 /* Allocate memory */
1966 ptr = HeapAlloc( header->heap,
1967 (flags & LMEM_MOVEABLE)? HEAP_ZERO_MEMORY : 0, size );
1968 if (!ptr) return 0;
1969
1970
1971 /* Allocate handle if requested */
1972 if (type >= 0)
1973 {
1974 int page, i;
1975
1976 /* Find first page of handle table with free slots */
1977 for (page = 0; page < HTABLE_NPAGES; page++)
1978 if (header->freeListFirst[page] != 0)
1979 break;
1980 if (page == HTABLE_NPAGES)
1981 {
1982 WARN("Out of handles!\n" );
1983 HeapFree( header->heap, 0, ptr );
1984 return 0;
1985 }
1986
1987 /* If virgin page, initialize it */
1988 if (header->freeListFirst[page] == 0xffff)
1989 {
1990 if ( !VirtualAlloc( (LPBYTE)header + (page << 12),
1991 0x1000, MEM_COMMIT, PAGE_READWRITE ) )
1992 {
1993 WARN("Cannot grow handle table!\n" );
1994 HeapFree( header->heap, 0, ptr );
1995 return 0;
1996 }
1997
1998 header->limit += HTABLE_PAGESIZE;
1999
2000 header->freeListFirst[page] = 0;
2001 header->freeListLast[page] = HTABLE_PAGESIZE - 4;
2002 header->freeListSize[page] = HTABLE_PAGESIZE / 4;
2003
2004 for (i = 0; i < HTABLE_PAGESIZE; i += 4)
2005 *(DWORD *)((LPBYTE)header + i) = i+4;
2006
2007 if (page < HTABLE_NPAGES-1)
2008 header->freeListFirst[page+1] = 0xffff;
2009 }
2010
2011 /* Allocate handle slot from page */
2012 handle = (LPDWORD)((LPBYTE)header + header->freeListFirst[page]);
2013 if (--header->freeListSize[page] == 0)
2014 header->freeListFirst[page] = header->freeListLast[page] = 0;
2015 else
2016 header->freeListFirst[page] = *handle;
2017
2018 /* Store 32-bit offset in handle slot */
2019 *handle = ptr - header->base;
2020 }
2021 else
2022 {
2023 handle = (LPDWORD)ptr;
2024 header->flags |= 1;
2025 }
2026
2027
2028 /* Convert handle to requested output type */
2029 Local32_FromHandle( header, type, &addr, handle, ptr );
2030 return addr;
2031 }
2032
2033 /***********************************************************************
2034 * K210 (KERNEL.210)
2035 */
2036 DWORD WINAPI Local32ReAlloc16( HANDLE heap, DWORD addr, INT16 type,
2037 DWORD size, DWORD flags )
2038 {
2039 LOCAL32HEADER *header = (LOCAL32HEADER *)heap;
2040 LPDWORD handle;
2041 LPBYTE ptr;
2042
2043 if (!addr)
2044 return Local32Alloc16( heap, size, type, flags );
2045
2046 /* Retrieve handle and pointer */
2047 Local32_ToHandle( header, type, addr, &handle, &ptr );
2048 if (!handle) return FALSE;
2049
2050 /* Reallocate memory block */
2051 ptr = HeapReAlloc( header->heap,
2052 (flags & LMEM_MOVEABLE)? HEAP_ZERO_MEMORY : 0,
2053 ptr, size );
2054 if (!ptr) return 0;
2055
2056 /* Modify handle */
2057 if (type >= 0)
2058 *handle = ptr - header->base;
2059 else
2060 handle = (LPDWORD)ptr;
2061
2062 /* Convert handle to requested output type */
2063 Local32_FromHandle( header, type, &addr, handle, ptr );
2064 return addr;
2065 }
2066
2067 /***********************************************************************
2068 * K211 (KERNEL.211)
2069 */
2070 BOOL WINAPI Local32Free16( HANDLE heap, DWORD addr, INT16 type )
2071 {
2072 LOCAL32HEADER *header = (LOCAL32HEADER *)heap;
2073 LPDWORD handle;
2074 LPBYTE ptr;
2075
2076 /* Retrieve handle and pointer */
2077 Local32_ToHandle( header, type, addr, &handle, &ptr );
2078 if (!handle) return FALSE;
2079
2080 /* Free handle if necessary */
2081 if (type >= 0)
2082 {
2083 int offset = (LPBYTE)handle - (LPBYTE)header;
2084 int page = offset >> 12;
2085
2086 /* Return handle slot to page free list */
2087 if (header->freeListSize[page]++ == 0)
2088 header->freeListFirst[page] = header->freeListLast[page] = offset;
2089 else
2090 *(LPDWORD)((LPBYTE)header + header->freeListLast[page]) = offset,
2091 header->freeListLast[page] = offset;
2092
2093 *handle = 0;
2094
2095 /* Shrink handle table when possible */
2096 while (page > 0 && header->freeListSize[page] == HTABLE_PAGESIZE / 4)
2097 {
2098 if ( VirtualFree( (LPBYTE)header +
2099 (header->limit & ~(HTABLE_PAGESIZE-1)),
2100 HTABLE_PAGESIZE, MEM_DECOMMIT ) )
2101 break;
2102
2103 header->limit -= HTABLE_PAGESIZE;
2104 header->freeListFirst[page] = 0xffff;
2105 page--;
2106 }
2107 }
2108
2109 /* Free memory */
2110 return HeapFree( header->heap, 0, ptr );
2111 }
2112
2113 /***********************************************************************
2114 * K213 (KERNEL.213)
2115 */
2116 DWORD WINAPI Local32Translate16( HANDLE heap, DWORD addr, INT16 type1, INT16 type2 )
2117 {
2118 LOCAL32HEADER *header = (LOCAL32HEADER *)heap;
2119 LPDWORD handle;
2120 LPBYTE ptr;
2121
2122 Local32_ToHandle( header, type1, addr, &handle, &ptr );
2123 if (!handle) return 0;
2124
2125 Local32_FromHandle( header, type2, &addr, handle, ptr );
2126 return addr;
2127 }
2128
2129 /***********************************************************************
2130 * K214 (KERNEL.214)
2131 */
2132 DWORD WINAPI Local32Size16( HANDLE heap, DWORD addr, INT16 type )
2133 {
2134 LOCAL32HEADER *header = (LOCAL32HEADER *)heap;
2135 LPDWORD handle;
2136 LPBYTE ptr;
2137
2138 Local32_ToHandle( header, type, addr, &handle, &ptr );
2139 if (!handle) return 0;
2140
2141 return HeapSize( header->heap, 0, ptr );
2142 }
2143
2144 /***********************************************************************
2145 * K215 (KERNEL.215)
2146 */
2147 BOOL WINAPI Local32ValidHandle16( HANDLE heap, WORD addr )
2148 {
2149 LOCAL32HEADER *header = (LOCAL32HEADER *)heap;
2150 LPDWORD handle;
2151 LPBYTE ptr;
2152
2153 Local32_ToHandle( header, 0, addr, &handle, &ptr );
2154 return handle != NULL;
2155 }
2156
2157 /***********************************************************************
2158 * K229 (KERNEL.229)
2159 */
2160 WORD WINAPI Local32GetSegment16( HANDLE heap )
2161 {
2162 LOCAL32HEADER *header = (LOCAL32HEADER *)heap;
2163 return header->segment;
2164 }
2165
2166 /***********************************************************************
2167 * Local32_GetHeap
2168 */
2169 static LOCAL32HEADER *Local32_GetHeap( HGLOBAL16 handle )
2170 {
2171 WORD selector = GlobalHandleToSel16( handle );
2172 DWORD base = GetSelectorBase( selector );
2173 DWORD limit = GetSelectorLimit16( selector );
2174
2175 /* Hmmm. This is a somewhat stupid heuristic, but Windows 95 does
2176 it this way ... */
2177
2178 if ( limit > 0x10000 && ((LOCAL32HEADER *)base)->magic == LOCAL32_MAGIC )
2179 return (LOCAL32HEADER *)base;
2180
2181 base += 0x10000;
2182 limit -= 0x10000;
2183
2184 if ( limit > 0x10000 && ((LOCAL32HEADER *)base)->magic == LOCAL32_MAGIC )
2185 return (LOCAL32HEADER *)base;
2186
2187 return NULL;
2188 }
2189
2190 /***********************************************************************
2191 * Local32Info (KERNEL.444)
2192 * Local32Info (TOOLHELP.84)
2193 */
2194 BOOL16 WINAPI Local32Info16( LOCAL32INFO *pLocal32Info, HGLOBAL16 handle )
2195 {
2196 PROCESS_HEAP_ENTRY entry;
2197 int i;
2198
2199 LOCAL32HEADER *header = Local32_GetHeap( handle );
2200 if ( !header ) return FALSE;
2201
2202 if ( !pLocal32Info || pLocal32Info->dwSize < sizeof(LOCAL32INFO) )
2203 return FALSE;
2204
2205 pLocal32Info->dwMemReserved = 0;
2206 pLocal32Info->dwMemCommitted = 0;
2207 pLocal32Info->dwTotalFree = 0;
2208 pLocal32Info->dwLargestFreeBlock = 0;
2209
2210 while (HeapWalk( header->heap, &entry ))
2211 {
2212 if (entry.wFlags & PROCESS_HEAP_REGION)
2213 {
2214 pLocal32Info->dwMemReserved += entry.u.Region.dwCommittedSize
2215 + entry.u.Region.dwUnCommittedSize;
2216 pLocal32Info->dwMemCommitted = entry.u.Region.dwCommittedSize;
2217 }
2218 else if (!(entry.wFlags & PROCESS_HEAP_ENTRY_BUSY))
2219 {
2220 DWORD size = entry.cbData + entry.cbOverhead;
2221 pLocal32Info->dwTotalFree += size;
2222 if (size > pLocal32Info->dwLargestFreeBlock) pLocal32Info->dwLargestFreeBlock = size;
2223 }
2224 }
2225
2226 pLocal32Info->dwcFreeHandles = 0;
2227 for ( i = 0; i < HTABLE_NPAGES; i++ )
2228 {
2229 if ( header->freeListFirst[i] == 0xffff ) break;
2230 pLocal32Info->dwcFreeHandles += header->freeListSize[i];
2231 }
2232 pLocal32Info->dwcFreeHandles += (HTABLE_NPAGES - i) * HTABLE_PAGESIZE/4;
2233
2234 return TRUE;
2235 }
2236
2237 /***********************************************************************
2238 * Local32First (KERNEL.445)
2239 * Local32First (TOOLHELP.85)
2240 */
2241 BOOL16 WINAPI Local32First16( LOCAL32ENTRY *pLocal32Entry, HGLOBAL16 handle )
2242 {
2243 FIXME("(%p, %04X): stub!\n", pLocal32Entry, handle );
2244 return FALSE;
2245 }
2246
2247 /***********************************************************************
2248 * Local32Next (KERNEL.446)
2249 * Local32Next (TOOLHELP.86)
2250 */
2251 BOOL16 WINAPI Local32Next16( LOCAL32ENTRY *pLocal32Entry )
2252 {
2253 FIXME("(%p): stub!\n", pLocal32Entry );
2254 return FALSE;
2255 }
Windows API implementation