memory/virtual.c

   1 /*
   2  * Win32 virtual memory functions
   3  *
   4  * Copyright 1997 Alexandre Julliard
   5  */
   6
   7 #include "config.h"
   8
   9 #include <assert.h>
  10 #include <errno.h>
  11 #ifdef HAVE_SYS_ERRNO_H
  12 #include <sys/errno.h>
  13 #endif
  14 #include <fcntl.h>
  15 #include <unistd.h>
  16 #include <stdlib.h>
  17 #include <stdio.h>
  18 #include <string.h>
  19 #include <sys/types.h>
  20 #ifdef HAVE_SYS_MMAN_H
  21 #include <sys/mman.h>
  22 #endif
  23 #include "winbase.h"
  24 #include "winerror.h"
  25 #include "file.h"
  26 #include "process.h"
  27 #include "global.h"
  28 #include "server.h"
  29 #include "debugtools.h"
  30
  31 DEFAULT_DEBUG_CHANNEL(virtual);
  32
  33 #ifndef MS_SYNC
  34 #define MS_SYNC 0
  35 #endif
  36
  37 /* File view */
  38 typedef struct _FV
  39 {
  40     struct _FV   *next;        /* Next view */
  41     struct _FV   *prev;        /* Prev view */
  42     UINT        base;        /* Base address */
  43     UINT        size;        /* Size in bytes */
  44     UINT        flags;       /* Allocation flags */
  45     UINT        offset;      /* Offset from start of mapped file */
  46     HANDLE      mapping;     /* Handle to the file mapping */
  47     HANDLERPROC   handlerProc; /* Fault handler */
  48     LPVOID        handlerArg;  /* Fault handler argument */
  49     BYTE          protect;     /* Protection for all pages at allocation time */
  50     BYTE          prot[1];     /* Protection byte for each page */
  51 } FILE_VIEW;
  52
  53 /* Per-view flags */
  54 #define VFLAG_SYSTEM     0x01
  55
  56 /* Conversion from VPROT_* to Win32 flags */
  57 static const BYTE VIRTUAL_Win32Flags[16] =
  58 {
  59     PAGE_NOACCESS,              /* 0 */
  60     PAGE_READONLY,              /* READ */
  61     PAGE_READWRITE,             /* WRITE */
  62     PAGE_READWRITE,             /* READ | WRITE */
  63     PAGE_EXECUTE,               /* EXEC */
  64     PAGE_EXECUTE_READ,          /* READ | EXEC */
  65     PAGE_EXECUTE_READWRITE,     /* WRITE | EXEC */
  66     PAGE_EXECUTE_READWRITE,     /* READ | WRITE | EXEC */
  67     PAGE_WRITECOPY,             /* WRITECOPY */
  68     PAGE_WRITECOPY,             /* READ | WRITECOPY */
  69     PAGE_WRITECOPY,             /* WRITE | WRITECOPY */
  70     PAGE_WRITECOPY,             /* READ | WRITE | WRITECOPY */
  71     PAGE_EXECUTE_WRITECOPY,     /* EXEC | WRITECOPY */
  72     PAGE_EXECUTE_WRITECOPY,     /* READ | EXEC | WRITECOPY */
  73     PAGE_EXECUTE_WRITECOPY,     /* WRITE | EXEC | WRITECOPY */
  74     PAGE_EXECUTE_WRITECOPY      /* READ | WRITE | EXEC | WRITECOPY */
  75 };
  76
  77
  78 static FILE_VIEW *VIRTUAL_FirstView;
  79
  80 #ifdef __i386__
  81 /* These are always the same on an i386, and it will be faster this way */
  82 # define page_mask  0xfff
  83 # define page_shift 12
  84 # define granularity_mask 0xffff
  85 #else
  86 static UINT page_shift;
  87 static UINT page_mask;
  88 static UINT granularity_mask;  /* Allocation granularity (usually 64k) */
  89 #endif  /* __i386__ */
  90
  91 #define ROUND_ADDR(addr) \
  92    ((UINT)(addr) & ~page_mask)
  93
  94 #define ROUND_SIZE(addr,size) \
  95    (((UINT)(size) + ((UINT)(addr) & page_mask) + page_mask) & ~page_mask)
  96
  97 #define VIRTUAL_DEBUG_DUMP_VIEW(view) \
  98    if (!TRACE_ON(virtual)); else VIRTUAL_DumpView(view)
  99
 100 /***********************************************************************
 101  *           VIRTUAL_GetProtStr
 102  */
 103 static const char *VIRTUAL_GetProtStr( BYTE prot )
 104 {
 105     static char buffer[6];
 106     buffer[0] = (prot & VPROT_COMMITTED) ? 'c' : '-';
 107     buffer[1] = (prot & VPROT_GUARD) ? 'g' : '-';
 108     buffer[2] = (prot & VPROT_READ) ? 'r' : '-';
 109     buffer[3] = (prot & VPROT_WRITE) ?
 110                     ((prot & VPROT_WRITECOPY) ? 'w' : 'W') : '-';
 111     buffer[4] = (prot & VPROT_EXEC) ? 'x' : '-';
 112     buffer[5] = 0;
 113     return buffer;
 114 }
 115
 116
 117 /***********************************************************************
 118  *           VIRTUAL_DumpView
 119  */
 120 static void VIRTUAL_DumpView( FILE_VIEW *view )
 121 {
 122     UINT i, count;
 123     UINT addr = view->base;
 124     BYTE prot = view->prot[0];
 125
 126     DPRINTF( "View: %08x - %08x%s",
 127           view->base, view->base + view->size - 1,
 128           (view->flags & VFLAG_SYSTEM) ? " (system)" : "" );
 129     if (view->mapping)
 130         DPRINTF( " %d @ %08x\n", view->mapping, view->offset );
 131     else
 132         DPRINTF( " (anonymous)\n");
 133
 134     for (count = i = 1; i < view->size >> page_shift; i++, count++)
 135     {
 136         if (view->prot[i] == prot) continue;
 137         DPRINTF( "      %08x - %08x %s\n",
 138               addr, addr + (count << page_shift) - 1,
 139               VIRTUAL_GetProtStr(prot) );
 140         addr += (count << page_shift);
 141         prot = view->prot[i];
 142         count = 0;
 143     }
 144     if (count)
 145         DPRINTF( "      %08x - %08x %s\n",
 146               addr, addr + (count << page_shift) - 1,
 147               VIRTUAL_GetProtStr(prot) );
 148 }
 149
 150
 151 /***********************************************************************
 152  *           VIRTUAL_Dump
 153  */
 154 void VIRTUAL_Dump(void)
 155 {
 156     FILE_VIEW *view = VIRTUAL_FirstView;
 157     DPRINTF( "\nDump of all virtual memory views:\n\n" );
 158     while (view)
 159     {
 160         VIRTUAL_DumpView( view );
 161         view = view->next;
 162     }
 163 }
 164
 165
 166 /***********************************************************************
 167  *           VIRTUAL_FindView
 168  *
 169  * Find the view containing a given address.
 170  *
 171  * RETURNS
 172  *      View: Success
 173  *      NULL: Failure
 174  */
 175 static FILE_VIEW *VIRTUAL_FindView(
 176                   UINT addr /* [in] Address */
 177 ) {
 178     FILE_VIEW *view = VIRTUAL_FirstView;
 179     while (view)
 180     {
 181         if (view->base > addr) return NULL;
 182         if (view->base + view->size > addr) return view;
 183         view = view->next;
 184     }
 185     return NULL;
 186 }
 187
 188
 189 /***********************************************************************
 190  *           VIRTUAL_CreateView
 191  *
 192  * Create a new view and add it in the linked list.
 193  */
 194 static FILE_VIEW *VIRTUAL_CreateView( UINT base, UINT size, UINT offset,
 195                                       UINT flags, BYTE vprot,
 196                                       HANDLE mapping )
 197 {
 198     FILE_VIEW *view, *prev;
 199
 200     /* Create the view structure */
 201
 202     assert( !(base & page_mask) );
 203     assert( !(size & page_mask) );
 204     size >>= page_shift;
 205     if (!(view = (FILE_VIEW *)malloc( sizeof(*view) + size - 1 ))) return NULL;
 206     view->base    = base;
 207     view->size    = size << page_shift;
 208     view->flags   = flags;
 209     view->offset  = offset;
 210     view->mapping = mapping;
 211     view->protect = vprot;
 212     view->handlerProc = NULL;
 213     memset( view->prot, vprot, size );
 214
 215     /* Duplicate the mapping handle */
 216
 217     if ((view->mapping != -1) &&
 218         !DuplicateHandle( GetCurrentProcess(), view->mapping,
 219                           GetCurrentProcess(), &view->mapping,
 220                           0, FALSE, DUPLICATE_SAME_ACCESS ))
 221     {
 222         free( view );
 223         return NULL;
 224     }
 225
 226     /* Insert it in the linked list */
 227
 228     if (!VIRTUAL_FirstView || (VIRTUAL_FirstView->base > base))
 229     {
 230         view->next = VIRTUAL_FirstView;
 231         view->prev = NULL;
 232         if (view->next) view->next->prev = view;
 233         VIRTUAL_FirstView = view;
 234     }
 235     else
 236     {
 237         prev = VIRTUAL_FirstView;
 238         while (prev->next && (prev->next->base < base)) prev = prev->next;
 239         view->next = prev->next;
 240         view->prev = prev;
 241         if (view->next) view->next->prev = view;
 242         prev->next  = view;
 243     }
 244     VIRTUAL_DEBUG_DUMP_VIEW( view );
 245     return view;
 246 }
 247
 248
 249 /***********************************************************************
 250  *           VIRTUAL_DeleteView
 251  * Deletes a view.
 252  *
 253  * RETURNS
 254  *      None
 255  */
 256 static void VIRTUAL_DeleteView(
 257             FILE_VIEW *view /* [in] View */
 258 ) {
 259     FILE_munmap( (void *)view->base, 0, view->size );
 260     if (view->next) view->next->prev = view->prev;
 261     if (view->prev) view->prev->next = view->next;
 262     else VIRTUAL_FirstView = view->next;
 263     if (view->mapping) CloseHandle( view->mapping );
 264     free( view );
 265 }
 266
 267
 268 /***********************************************************************
 269  *           VIRTUAL_GetUnixProt
 270  *
 271  * Convert page protections to protection for mmap/mprotect.
 272  */
 273 static int VIRTUAL_GetUnixProt( BYTE vprot )
 274 {
 275     int prot = 0;
 276     if ((vprot & VPROT_COMMITTED) && !(vprot & VPROT_GUARD))
 277     {
 278         if (vprot & VPROT_READ) prot |= PROT_READ;
 279         if (vprot & VPROT_WRITE) prot |= PROT_WRITE;
 280         if (vprot & VPROT_EXEC) prot |= PROT_EXEC;
 281     }
 282     return prot;
 283 }
 284
 285
 286 /***********************************************************************
 287  *           VIRTUAL_GetWin32Prot
 288  *
 289  * Convert page protections to Win32 flags.
 290  *
 291  * RETURNS
 292  *      None
 293  */
 294 static void VIRTUAL_GetWin32Prot(
 295             BYTE vprot,     /* [in] Page protection flags */
 296             DWORD *protect, /* [out] Location to store Win32 protection flags */
 297             DWORD *state    /* [out] Location to store mem state flag */
 298 ) {
 299     if (protect) {
 300         *protect = VIRTUAL_Win32Flags[vprot & 0x0f];
 301 /*      if (vprot & VPROT_GUARD) *protect |= PAGE_GUARD;*/
 302         if (vprot & VPROT_NOCACHE) *protect |= PAGE_NOCACHE;
 303
 304         if (vprot & VPROT_GUARD) *protect = PAGE_NOACCESS;
 305     }
 306
 307     if (state) *state = (vprot & VPROT_COMMITTED) ? MEM_COMMIT : MEM_RESERVE;
 308 }
 309
 310
 311 /***********************************************************************
 312  *           VIRTUAL_GetProt
 313  *
 314  * Build page protections from Win32 flags.
 315  *
 316  * RETURNS
 317  *      Value of page protection flags
 318  */
 319 static BYTE VIRTUAL_GetProt(
 320             DWORD protect  /* [in] Win32 protection flags */
 321 ) {
 322     BYTE vprot;
 323
 324     switch(protect & 0xff)
 325     {
 326     case PAGE_READONLY:
 327         vprot = VPROT_READ;
 328         break;
 329     case PAGE_READWRITE:
 330         vprot = VPROT_READ | VPROT_WRITE;
 331         break;
 332     case PAGE_WRITECOPY:
 333         vprot = VPROT_READ | VPROT_WRITE | VPROT_WRITECOPY;
 334         break;
 335     case PAGE_EXECUTE:
 336         vprot = VPROT_EXEC;
 337         break;
 338     case PAGE_EXECUTE_READ:
 339         vprot = VPROT_EXEC | VPROT_READ;
 340         break;
 341     case PAGE_EXECUTE_READWRITE:
 342         vprot = VPROT_EXEC | VPROT_READ | VPROT_WRITE | VPROT_WRITECOPY;
 343         break;
 344     case PAGE_EXECUTE_WRITECOPY:
 345         vprot = VPROT_EXEC | VPROT_READ | VPROT_WRITE;
 346         break;
 347     case PAGE_NOACCESS:
 348     default:
 349         vprot = 0;
 350         break;
 351     }
 352     if (protect & PAGE_GUARD) vprot |= VPROT_GUARD;
 353     if (protect & PAGE_NOCACHE) vprot |= VPROT_NOCACHE;
 354     return vprot;
 355 }
 356
 357
 358 /***********************************************************************
 359  *           VIRTUAL_SetProt
 360  *
 361  * Change the protection of a range of pages.
 362  *
 363  * RETURNS
 364  *      TRUE: Success
 365  *      FALSE: Failure
 366  */
 367 static BOOL VIRTUAL_SetProt(
 368               FILE_VIEW *view, /* [in] Pointer to view */
 369               UINT base,     /* [in] Starting address */
 370               UINT size,     /* [in] Size in bytes */
 371               BYTE vprot       /* [in] Protections to use */
 372 ) {
 373     TRACE("%08x-%08x %s\n",
 374                      base, base + size - 1, VIRTUAL_GetProtStr( vprot ) );
 375
 376     if (mprotect( (void *)base, size, VIRTUAL_GetUnixProt(vprot) ))
 377         return FALSE;  /* FIXME: last error */
 378
 379     memset( view->prot + ((base - view->base) >> page_shift),
 380             vprot, size >> page_shift );
 381     VIRTUAL_DEBUG_DUMP_VIEW( view );
 382     return TRUE;
 383 }
 384
 385
 386 /***********************************************************************
 387  *             VIRTUAL_CheckFlags
 388  *
 389  * Check that all pages in a range have the given flags.
 390  *
 391  * RETURNS
 392  *      TRUE: They do
 393  *      FALSE: They do not
 394  */
 395 static BOOL VIRTUAL_CheckFlags(
 396               UINT base, /* [in] Starting address */
 397               UINT size, /* [in] Size in bytes */
 398               BYTE flags   /* [in] Flags to check for */
 399 ) {
 400     FILE_VIEW *view;
 401     UINT page;
 402
 403     if (!size) return TRUE;
 404     if (!(view = VIRTUAL_FindView( base ))) return FALSE;
 405     if (view->base + view->size < base + size) return FALSE;
 406     page = (base - view->base) >> page_shift;
 407     size = ROUND_SIZE( base, size ) >> page_shift;
 408     while (size--) if ((view->prot[page++] & flags) != flags) return FALSE;
 409     return TRUE;
 410 }
 411
 412
 413 /***********************************************************************
 414  *           VIRTUAL_Init
 415  */
 416 BOOL VIRTUAL_Init(void)
 417 {
 418 #ifndef __i386__
 419     DWORD page_size;
 420
 421 # ifdef HAVE_GETPAGESIZE
 422     page_size = getpagesize();
 423 # else
 424 #  ifdef __svr4__
 425     page_size = sysconf(_SC_PAGESIZE);
 426 #  else
 427 #   error Cannot get the page size on this platform
 428 #  endif
 429 # endif
 430     page_mask = page_size - 1;
 431     granularity_mask = 0xffff;  /* hard-coded for now */
 432     /* Make sure we have a power of 2 */
 433     assert( !(page_size & page_mask) );
 434     page_shift = 0;
 435     while ((1 << page_shift) != page_size) page_shift++;
 436 #endif  /* !__i386__ */
 437
 438 #ifdef linux
 439     {
 440         /* Do not use stdio here since it may temporarily change the size
 441          * of some segments (ie libc6 adds 0x1000 per open FILE)
 442          */
 443         int fd = open ("/proc/self/maps", O_RDONLY);
 444         if (fd >= 0)
 445         {
 446             char buffer[512]; /* line might be rather long in 2.1 */
 447
 448             for (;;)
 449             {
 450                 int start, end, offset;
 451                 char r, w, x, p;
 452                 BYTE vprot = VPROT_COMMITTED;
 453
 454                 char * ptr = buffer;
 455                 int count = sizeof(buffer);
 456                 while (1 == read(fd, ptr, 1) && *ptr != '\n' && --count > 0)
 457                     ptr++;
 458
 459                 if (*ptr != '\n') break;
 460                 *ptr = '\0';
 461
 462                 sscanf( buffer, "%x-%x %c%c%c%c %x",
 463                         &start, &end, &r, &w, &x, &p, &offset );
 464                 if (r == 'r') vprot |= VPROT_READ;
 465                 if (w == 'w') vprot |= VPROT_WRITE;
 466                 if (x == 'x') vprot |= VPROT_EXEC;
 467                 if (p == 'p') vprot |= VPROT_WRITECOPY;
 468                 VIRTUAL_CreateView( start, end - start, 0,
 469                                     VFLAG_SYSTEM, vprot, -1 );
 470             }
 471             close (fd);
 472         }
 473     }
 474 #endif  /* linux */
 475     return TRUE;
 476 }
 477
 478
 479 /***********************************************************************
 480  *           VIRTUAL_GetPageSize
 481  */
 482 DWORD VIRTUAL_GetPageSize(void)
 483 {
 484     return 1 << page_shift;
 485 }
 486
 487
 488 /***********************************************************************
 489  *           VIRTUAL_GetGranularity
 490  */
 491 DWORD VIRTUAL_GetGranularity(void)
 492 {
 493     return granularity_mask + 1;
 494 }
 495
 496
 497 /***********************************************************************
 498  *           VIRTUAL_SetFaultHandler
 499  */
 500 BOOL VIRTUAL_SetFaultHandler( LPCVOID addr, HANDLERPROC proc, LPVOID arg )
 501 {
 502     FILE_VIEW *view;
 503
 504     if (!(view = VIRTUAL_FindView((UINT)addr))) return FALSE;
 505     view->handlerProc = proc;
 506     view->handlerArg  = arg;
 507     return TRUE;
 508 }
 509
 510 /***********************************************************************
 511  *           VIRTUAL_HandleFault
 512  */
 513 BOOL VIRTUAL_HandleFault( LPCVOID addr )
 514 {
 515     FILE_VIEW *view = VIRTUAL_FindView((UINT)addr);
 516
 517     if (view && view->handlerProc)
 518         return view->handlerProc(view->handlerArg, addr);
 519     return FALSE;
 520 }
 521
 522
 523 /***********************************************************************
 524  *             VirtualAlloc   (KERNEL32.548)
 525  * Reserves or commits a region of pages in virtual address space
 526  *
 527  * RETURNS
 528  *      Base address of allocated region of pages
 529  *      NULL: Failure
 530  */
 531 LPVOID WINAPI VirtualAlloc(
 532               LPVOID addr,  /* [in] Address of region to reserve or commit */
 533               DWORD size,   /* [in] Size of region */
 534               DWORD type,   /* [in] Type of allocation */
 535               DWORD protect /* [in] Type of access protection */
 536 ) {
 537     FILE_VIEW *view;
 538     UINT base, ptr, view_size;
 539     BYTE vprot;
 540
 541     TRACE("%08x %08lx %lx %08lx\n",
 542                      (UINT)addr, size, type, protect );
 543
 544     /* Round parameters to a page boundary */
 545
 546     if (size > 0x7fc00000)  /* 2Gb - 4Mb */
 547     {
 548         SetLastError( ERROR_OUTOFMEMORY );
 549         return NULL;
 550     }
 551     if (addr)
 552     {
 553         if (type & MEM_RESERVE) /* Round down to 64k boundary */
 554             base = (UINT)addr & ~granularity_mask;
 555         else
 556             base = ROUND_ADDR( addr );
 557         size = (((UINT)addr + size + page_mask) & ~page_mask) - base;
 558         if ((base <= granularity_mask) || (base + size < base))
 559         {
 560             /* disallow low 64k and wrap-around */
 561             SetLastError( ERROR_INVALID_PARAMETER );
 562             return NULL;
 563         }
 564     }
 565     else
 566     {
 567         base = 0;
 568         size = (size + page_mask) & ~page_mask;
 569     }
 570
 571     if (type & MEM_TOP_DOWN) {
 572         /* FIXME: MEM_TOP_DOWN allocates the largest possible address.
 573          *        Is there _ANY_ way to do it with UNIX mmap()?
 574          */
 575         WARN("MEM_TOP_DOWN ignored\n");
 576         type &= ~MEM_TOP_DOWN;
 577     }
 578     /* Compute the protection flags */
 579
 580     if (!(type & (MEM_COMMIT | MEM_RESERVE)) ||
 581         (type & ~(MEM_COMMIT | MEM_RESERVE)))
 582     {
 583         SetLastError( ERROR_INVALID_PARAMETER );
 584         return NULL;
 585     }
 586     if (type & MEM_COMMIT)
 587         vprot = VIRTUAL_GetProt( protect ) | VPROT_COMMITTED;
 588     else vprot = 0;
 589
 590     /* Reserve the memory */
 591
 592     if ((type & MEM_RESERVE) || !base)
 593     {
 594         view_size = size + (base ? 0 : granularity_mask + 1);
 595         ptr = (UINT)FILE_dommap( -1, (LPVOID)base, 0, view_size, 0, 0,
 596                                    VIRTUAL_GetUnixProt( vprot ), MAP_PRIVATE );
 597         if (ptr == (UINT)-1)
 598         {
 599             SetLastError( ERROR_OUTOFMEMORY );
 600             return NULL;
 601         }
 602         if (!base)
 603         {
 604             /* Release the extra memory while keeping the range */
 605             /* starting on a 64k boundary. */
 606
 607             if (ptr & granularity_mask)
 608             {
 609                 UINT extra = granularity_mask + 1 - (ptr & granularity_mask);
 610                 FILE_munmap( (void *)ptr, 0, extra );
 611                 ptr += extra;
 612                 view_size -= extra;
 613             }
 614             if (view_size > size)
 615                 FILE_munmap( (void *)(ptr + size), 0, view_size - size );
 616         }
 617         else if (ptr != base)
 618         {
 619             /* We couldn't get the address we wanted */
 620             FILE_munmap( (void *)ptr, 0, view_size );
 621             SetLastError( ERROR_INVALID_ADDRESS );
 622             return NULL;
 623         }
 624         if (!(view = VIRTUAL_CreateView( ptr, size, 0, 0, vprot, -1 )))
 625         {
 626             FILE_munmap( (void *)ptr, 0, size );
 627             SetLastError( ERROR_OUTOFMEMORY );
 628             return NULL;
 629         }
 630         VIRTUAL_DEBUG_DUMP_VIEW( view );
 631         return (LPVOID)ptr;
 632     }
 633
 634     /* Commit the pages */
 635
 636     if (!(view = VIRTUAL_FindView( base )) ||
 637         (base + size > view->base + view->size))
 638     {
 639         SetLastError( ERROR_INVALID_ADDRESS );
 640         return NULL;
 641     }
 642
 643     if (!VIRTUAL_SetProt( view, base, size, vprot )) return NULL;
 644     return (LPVOID)base;
 645 }
 646
 647
 648 /***********************************************************************
 649  *             VirtualFree   (KERNEL32.550)
 650  * Release or decommits a region of pages in virtual address space.
 651  *
 652  * RETURNS
 653  *      TRUE: Success
 654  *      FALSE: Failure
 655  */
 656 BOOL WINAPI VirtualFree(
 657               LPVOID addr, /* [in] Address of region of committed pages */
 658               DWORD size,  /* [in] Size of region */
 659               DWORD type   /* [in] Type of operation */
 660 ) {
 661     FILE_VIEW *view;
 662     UINT base;
 663
 664     TRACE("%08x %08lx %lx\n",
 665                      (UINT)addr, size, type );
 666
 667     /* Fix the parameters */
 668
 669     size = ROUND_SIZE( addr, size );
 670     base = ROUND_ADDR( addr );
 671
 672     if (!(view = VIRTUAL_FindView( base )) ||
 673         (base + size > view->base + view->size))
 674     {
 675         SetLastError( ERROR_INVALID_PARAMETER );
 676         return FALSE;
 677     }
 678
 679     /* Compute the protection flags */
 680
 681     if ((type != MEM_DECOMMIT) && (type != MEM_RELEASE))
 682     {
 683         SetLastError( ERROR_INVALID_PARAMETER );
 684         return FALSE;
 685     }
 686
 687     /* Free the pages */
 688
 689     if (type == MEM_RELEASE)
 690     {
 691         if (size || (base != view->base))
 692         {
 693             SetLastError( ERROR_INVALID_PARAMETER );
 694             return FALSE;
 695         }
 696         VIRTUAL_DeleteView( view );
 697         return TRUE;
 698     }
 699
 700     /* Decommit the pages by remapping zero-pages instead */
 701
 702     if (FILE_dommap( -1, (LPVOID)base, 0, size, 0, 0,
 703                      VIRTUAL_GetUnixProt( 0 ), MAP_PRIVATE|MAP_FIXED )
 704         != (LPVOID)base)
 705         ERR( "Could not remap pages, expect trouble\n" );
 706     return VIRTUAL_SetProt( view, base, size, 0 );
 707 }
 708
 709
 710 /***********************************************************************
 711  *             VirtualLock   (KERNEL32.551)
 712  * Locks the specified region of virtual address space
 713  *
 714  * NOTE
 715  *      Always returns TRUE
 716  *
 717  * RETURNS
 718  *      TRUE: Success
 719  *      FALSE: Failure
 720  */
 721 BOOL WINAPI VirtualLock(
 722               LPVOID addr, /* [in] Address of first byte of range to lock */
 723               DWORD size   /* [in] Number of bytes in range to lock */
 724 ) {
 725     return TRUE;
 726 }
 727
 728
 729 /***********************************************************************
 730  *             VirtualUnlock   (KERNEL32.556)
 731  * Unlocks a range of pages in the virtual address space
 732  *
 733  * NOTE
 734  *      Always returns TRUE
 735  *
 736  * RETURNS
 737  *      TRUE: Success
 738  *      FALSE: Failure
 739  */
 740 BOOL WINAPI VirtualUnlock(
 741               LPVOID addr, /* [in] Address of first byte of range */
 742               DWORD size   /* [in] Number of bytes in range */
 743 ) {
 744     return TRUE;
 745 }
 746
 747
 748 /***********************************************************************
 749  *             VirtualProtect   (KERNEL32.552)
 750  * Changes the access protection on a region of committed pages
 751  *
 752  * RETURNS
 753  *      TRUE: Success
 754  *      FALSE: Failure
 755  */
 756 BOOL WINAPI VirtualProtect(
 757               LPVOID addr,     /* [in] Address of region of committed pages */
 758               DWORD size,      /* [in] Size of region */
 759               DWORD new_prot,  /* [in] Desired access protection */
 760               LPDWORD old_prot /* [out] Address of variable to get old protection */
 761 ) {
 762     FILE_VIEW *view;
 763     UINT base, i;
 764     BYTE vprot, *p;
 765
 766     TRACE("%08x %08lx %08lx\n",
 767                      (UINT)addr, size, new_prot );
 768
 769     /* Fix the parameters */
 770
 771     size = ROUND_SIZE( addr, size );
 772     base = ROUND_ADDR( addr );
 773
 774     if (!(view = VIRTUAL_FindView( base )) ||
 775         (base + size > view->base + view->size))
 776     {
 777         SetLastError( ERROR_INVALID_PARAMETER );
 778         return FALSE;
 779     }
 780
 781     /* Make sure all the pages are committed */
 782
 783     p = view->prot + ((base - view->base) >> page_shift);
 784     for (i = size >> page_shift; i; i--, p++)
 785     {
 786         if (!(*p & VPROT_COMMITTED))
 787         {
 788             SetLastError( ERROR_INVALID_PARAMETER );
 789             return FALSE;
 790         }
 791     }
 792
 793     VIRTUAL_GetWin32Prot( view->prot[0], old_prot, NULL );
 794     vprot = VIRTUAL_GetProt( new_prot ) | VPROT_COMMITTED;
 795     return VIRTUAL_SetProt( view, base, size, vprot );
 796 }
 797
 798
 799 /***********************************************************************
 800  *             VirtualProtectEx   (KERNEL32.553)
 801  * Changes the access protection on a region of committed pages in the
 802  * virtual address space of a specified process
 803  *
 804  * RETURNS
 805  *      TRUE: Success
 806  *      FALSE: Failure
 807  */
 808 BOOL WINAPI VirtualProtectEx(
 809               HANDLE handle, /* [in]  Handle of process */
 810               LPVOID addr,     /* [in]  Address of region of committed pages */
 811               DWORD size,      /* [in]  Size of region */
 812               DWORD new_prot,  /* [in]  Desired access protection */
 813               LPDWORD old_prot /* [out] Address of variable to get old protection */ )
 814 {
 815     if (MapProcessHandle( handle ) == GetCurrentProcessId())
 816         return VirtualProtect( addr, size, new_prot, old_prot );
 817     ERR("Unsupported on other process\n");
 818     return FALSE;
 819 }
 820
 821
 822 /***********************************************************************
 823  *             VirtualQuery   (KERNEL32.554)
 824  * Provides info about a range of pages in virtual address space
 825  *
 826  * RETURNS
 827  *      Number of bytes returned in information buffer
 828  */
 829 DWORD WINAPI VirtualQuery(
 830              LPCVOID addr,                    /* [in]  Address of region */
 831              LPMEMORY_BASIC_INFORMATION info, /* [out] Address of info buffer */
 832              DWORD len                        /* [in]  Size of buffer */
 833 ) {
 834     FILE_VIEW *view = VIRTUAL_FirstView;
 835     UINT base = ROUND_ADDR( addr );
 836     UINT alloc_base = 0;
 837     UINT size = 0;
 838
 839     /* Find the view containing the address */
 840
 841     for (;;)
 842     {
 843         if (!view)
 844         {
 845             size = 0xffff0000 - alloc_base;
 846             break;
 847         }
 848         if (view->base > base)
 849         {
 850             size = view->base - alloc_base;
 851             view = NULL;
 852             break;
 853         }
 854         if (view->base + view->size > base)
 855         {
 856             alloc_base = view->base;
 857             size = view->size;
 858             break;
 859         }
 860         alloc_base = view->base + view->size;
 861         view = view->next;
 862     }
 863
 864     /* Fill the info structure */
 865
 866     if (!view)
 867     {
 868         info->State             = MEM_FREE;
 869         info->Protect           = 0;
 870         info->AllocationProtect = 0;
 871         info->Type              = 0;
 872     }
 873     else
 874     {
 875         BYTE vprot = view->prot[(base - alloc_base) >> page_shift];
 876         VIRTUAL_GetWin32Prot( vprot, &info->Protect, &info->State );
 877         for (size = base - alloc_base; size < view->size; size += page_mask+1)
 878             if (view->prot[size >> page_shift] != vprot) break;
 879         info->AllocationProtect = view->protect;
 880         info->Type              = MEM_PRIVATE;  /* FIXME */
 881     }
 882
 883     info->BaseAddress    = (LPVOID)base;
 884     info->AllocationBase = (LPVOID)alloc_base;
 885     info->RegionSize     = size - (base - alloc_base);
 886     return sizeof(*info);
 887 }
 888
 889
 890 /***********************************************************************
 891  *             VirtualQueryEx   (KERNEL32.555)
 892  * Provides info about a range of pages in virtual address space of a
 893  * specified process
 894  *
 895  * RETURNS
 896  *      Number of bytes returned in information buffer
 897  */
 898 DWORD WINAPI VirtualQueryEx(
 899              HANDLE handle,                 /* [in] Handle of process */
 900              LPCVOID addr,                    /* [in] Address of region */
 901              LPMEMORY_BASIC_INFORMATION info, /* [out] Address of info buffer */
 902              DWORD len                        /* [in] Size of buffer */ )
 903 {
 904     if (MapProcessHandle( handle ) == GetCurrentProcessId())
 905         return VirtualQuery( addr, info, len );
 906     ERR("Unsupported on other process\n");
 907     return 0;
 908 }
 909
 910
 911 /***********************************************************************
 912  *             IsBadReadPtr32   (KERNEL32.354)
 913  *
 914  * RETURNS
 915  *      FALSE: Process has read access to entire block
 916  *      TRUE: Otherwise
 917  */
 918 BOOL WINAPI IsBadReadPtr(
 919               LPCVOID ptr, /* Address of memory block */
 920               UINT size  /* Size of block */
 921 ) {
 922     return !VIRTUAL_CheckFlags( (UINT)ptr, size,
 923                                 VPROT_READ | VPROT_COMMITTED );
 924 }
 925
 926
 927 /***********************************************************************
 928  *             IsBadWritePtr32   (KERNEL32.357)
 929  *
 930  * RETURNS
 931  *      FALSE: Process has write access to entire block
 932  *      TRUE: Otherwise
 933  */
 934 BOOL WINAPI IsBadWritePtr(
 935               LPVOID ptr, /* [in] Address of memory block */
 936               UINT size /* [in] Size of block in bytes */
 937 ) {
 938     return !VIRTUAL_CheckFlags( (UINT)ptr, size,
 939                                 VPROT_WRITE | VPROT_COMMITTED );
 940 }
 941
 942
 943 /***********************************************************************
 944  *             IsBadHugeReadPtr32   (KERNEL32.352)
 945  * RETURNS
 946  *      FALSE: Process has read access to entire block
 947  *      TRUE: Otherwise
 948  */
 949 BOOL WINAPI IsBadHugeReadPtr(
 950               LPCVOID ptr, /* [in] Address of memory block */
 951               UINT size  /* [in] Size of block */
 952 ) {
 953     return IsBadReadPtr( ptr, size );
 954 }
 955
 956
 957 /***********************************************************************
 958  *             IsBadHugeWritePtr32   (KERNEL32.353)
 959  * RETURNS
 960  *      FALSE: Process has write access to entire block
 961  *      TRUE: Otherwise
 962  */
 963 BOOL WINAPI IsBadHugeWritePtr(
 964               LPVOID ptr, /* [in] Address of memory block */
 965               UINT size /* [in] Size of block */
 966 ) {
 967     return IsBadWritePtr( ptr, size );
 968 }
 969
 970
 971 /***********************************************************************
 972  *             IsBadCodePtr32   (KERNEL32.351)
 973  *
 974  * RETURNS
 975  *      FALSE: Process has read access to specified memory
 976  *      TRUE: Otherwise
 977  */
 978 BOOL WINAPI IsBadCodePtr(
 979               FARPROC ptr /* [in] Address of function */
 980 ) {
 981     return !VIRTUAL_CheckFlags( (UINT)ptr, 1, VPROT_EXEC | VPROT_COMMITTED );
 982 }
 983
 984
 985 /***********************************************************************
 986  *             IsBadStringPtr32A   (KERNEL32.355)
 987  *
 988  * RETURNS
 989  *      FALSE: Read access to all bytes in string
 990  *      TRUE: Else
 991  */
 992 BOOL WINAPI IsBadStringPtrA(
 993               LPCSTR str, /* [in] Address of string */
 994               UINT max  /* [in] Maximum size of string */
 995 ) {
 996     FILE_VIEW *view;
 997     UINT page, count;
 998
 999     if (!max) return FALSE;
1000     if (!(view = VIRTUAL_FindView( (UINT)str ))) return TRUE;
1001     page  = ((UINT)str - view->base) >> page_shift;
1002     count = page_mask + 1 - ((UINT)str & page_mask);
1003
1004     while (max)
1005     {
1006         if ((view->prot[page] & (VPROT_READ | VPROT_COMMITTED)) !=
1007                                                 (VPROT_READ | VPROT_COMMITTED))
1008             return TRUE;
1009         if (count > max) count = max;
1010         max -= count;
1011         while (count--) if (!*str++) return FALSE;
1012         if (++page >= view->size >> page_shift) return TRUE;
1013         count = page_mask + 1;
1014     }
1015     return FALSE;
1016 }
1017
1018
1019 /***********************************************************************
1020  *             IsBadStringPtr32W   (KERNEL32.356)
1021  * See IsBadStringPtr32A
1022  */
1023 BOOL WINAPI IsBadStringPtrW( LPCWSTR str, UINT max )
1024 {
1025     FILE_VIEW *view;
1026     UINT page, count;
1027
1028     if (!max) return FALSE;
1029     if (!(view = VIRTUAL_FindView( (UINT)str ))) return TRUE;
1030     page  = ((UINT)str - view->base) >> page_shift;
1031     count = (page_mask + 1 - ((UINT)str & page_mask)) / sizeof(WCHAR);
1032
1033     while (max)
1034     {
1035         if ((view->prot[page] & (VPROT_READ | VPROT_COMMITTED)) !=
1036                                                 (VPROT_READ | VPROT_COMMITTED))
1037             return TRUE;
1038         if (count > max) count = max;
1039         max -= count;
1040         while (count--) if (!*str++) return FALSE;
1041         if (++page >= view->size >> page_shift) return TRUE;
1042         count = (page_mask + 1) / sizeof(WCHAR);
1043     }
1044     return FALSE;
1045 }
1046
1047
1048 /***********************************************************************
1049  *             CreateFileMapping32A   (KERNEL32.46)
1050  * Creates a named or unnamed file-mapping object for the specified file
1051  *
1052  * RETURNS
1053  *      Handle: Success
1054  *      0: Mapping object does not exist
1055  *      NULL: Failure
1056  */
1057 HANDLE WINAPI CreateFileMappingA(
1058                 HFILE hFile,   /* [in] Handle of file to map */
1059                 SECURITY_ATTRIBUTES *sa, /* [in] Optional security attributes*/
1060                 DWORD protect,   /* [in] Protection for mapping object */
1061                 DWORD size_high, /* [in] High-order 32 bits of object size */
1062                 DWORD size_low,  /* [in] Low-order 32 bits of object size */
1063                 LPCSTR name      /* [in] Name of file-mapping object */ )
1064 {
1065     struct create_mapping_request *req = get_req_buffer();
1066     BYTE vprot;
1067
1068     /* Check parameters */
1069
1070     TRACE("(%x,%p,%08lx,%08lx%08lx,%s)\n",
1071           hFile, sa, protect, size_high, size_low, debugstr_a(name) );
1072
1073     vprot = VIRTUAL_GetProt( protect );
1074     if (protect & SEC_RESERVE)
1075     {
1076         if (hFile != INVALID_HANDLE_VALUE)
1077         {
1078             SetLastError( ERROR_INVALID_PARAMETER );
1079             return 0;
1080         }
1081     }
1082     else vprot |= VPROT_COMMITTED;
1083     if (protect & SEC_NOCACHE) vprot |= VPROT_NOCACHE;
1084
1085     /* Create the server object */
1086
1087     req->file_handle = hFile;
1088     req->size_high   = size_high;
1089     req->size_low    = size_low;
1090     req->protect     = vprot;
1091     req->inherit     = (sa && (sa->nLength>=sizeof(*sa)) && sa->bInheritHandle);
1092     server_strcpyAtoW( req->name, name );
1093     SetLastError(0);
1094     server_call( REQ_CREATE_MAPPING );
1095     if (req->handle == -1) return 0;
1096     return req->handle;
1097 }
1098
1099
1100 /***********************************************************************
1101  *             CreateFileMapping32W   (KERNEL32.47)
1102  * See CreateFileMapping32A
1103  */
1104 HANDLE WINAPI CreateFileMappingW( HFILE hFile, LPSECURITY_ATTRIBUTES sa,
1105                                   DWORD protect, DWORD size_high,
1106                                   DWORD size_low, LPCWSTR name )
1107 {
1108     struct create_mapping_request *req = get_req_buffer();
1109     BYTE vprot;
1110
1111     /* Check parameters */
1112
1113     TRACE("(%x,%p,%08lx,%08lx%08lx,%s)\n",
1114           hFile, sa, protect, size_high, size_low, debugstr_w(name) );
1115
1116     vprot = VIRTUAL_GetProt( protect );
1117     if (protect & SEC_RESERVE)
1118     {
1119         if (hFile != INVALID_HANDLE_VALUE)
1120         {
1121             SetLastError( ERROR_INVALID_PARAMETER );
1122             return 0;
1123         }
1124     }
1125     else vprot |= VPROT_COMMITTED;
1126     if (protect & SEC_NOCACHE) vprot |= VPROT_NOCACHE;
1127
1128     /* Create the server object */
1129
1130     req->file_handle = hFile;
1131     req->size_high   = size_high;
1132     req->size_low    = size_low;
1133     req->protect     = vprot;
1134     req->inherit     = (sa && (sa->nLength>=sizeof(*sa)) && sa->bInheritHandle);
1135     server_strcpyW( req->name, name );
1136     SetLastError(0);
1137     server_call( REQ_CREATE_MAPPING );
1138     if (req->handle == -1) return 0;
1139     return req->handle;
1140 }
1141
1142
1143 /***********************************************************************
1144  *             OpenFileMapping32A   (KERNEL32.397)
1145  * Opens a named file-mapping object.
1146  *
1147  * RETURNS
1148  *      Handle: Success
1149  *      NULL: Failure
1150  */
1151 HANDLE WINAPI OpenFileMappingA(
1152                 DWORD access,   /* [in] Access mode */
1153                 BOOL inherit, /* [in] Inherit flag */
1154                 LPCSTR name )   /* [in] Name of file-mapping object */
1155 {
1156     struct open_mapping_request *req = get_req_buffer();
1157
1158     req->access  = access;
1159     req->inherit = inherit;
1160     server_strcpyAtoW( req->name, name );
1161     server_call( REQ_OPEN_MAPPING );
1162     if (req->handle == -1) return 0; /* must return 0 on failure, not -1 */
1163     return req->handle;
1164 }
1165
1166
1167 /***********************************************************************
1168  *             OpenFileMapping32W   (KERNEL32.398)
1169  * See OpenFileMapping32A
1170  */
1171 HANDLE WINAPI OpenFileMappingW( DWORD access, BOOL inherit, LPCWSTR name)
1172 {
1173     struct open_mapping_request *req = get_req_buffer();
1174
1175     req->access  = access;
1176     req->inherit = inherit;
1177     server_strcpyW( req->name, name );
1178     server_call( REQ_OPEN_MAPPING );
1179     if (req->handle == -1) return 0; /* must return 0 on failure, not -1 */
1180     return req->handle;
1181 }
1182
1183
1184 /***********************************************************************
1185  *             MapViewOfFile   (KERNEL32.385)
1186  * Maps a view of a file into the address space
1187  *
1188  * RETURNS
1189  *      Starting address of mapped view
1190  *      NULL: Failure
1191  */
1192 LPVOID WINAPI MapViewOfFile(
1193               HANDLE mapping,  /* [in] File-mapping object to map */
1194               DWORD access,      /* [in] Access mode */
1195               DWORD offset_high, /* [in] High-order 32 bits of file offset */
1196               DWORD offset_low,  /* [in] Low-order 32 bits of file offset */
1197               DWORD count        /* [in] Number of bytes to map */
1198 ) {
1199     return MapViewOfFileEx( mapping, access, offset_high,
1200                             offset_low, count, NULL );
1201 }
1202
1203
1204 /***********************************************************************
1205  *             MapViewOfFileEx   (KERNEL32.386)
1206  * Maps a view of a file into the address space
1207  *
1208  * RETURNS
1209  *      Starting address of mapped view
1210  *      NULL: Failure
1211  */
1212 LPVOID WINAPI MapViewOfFileEx(
1213               HANDLE handle,   /* [in] File-mapping object to map */
1214               DWORD access,      /* [in] Access mode */
1215               DWORD offset_high, /* [in] High-order 32 bits of file offset */
1216               DWORD offset_low,  /* [in] Low-order 32 bits of file offset */
1217               DWORD count,       /* [in] Number of bytes to map */
1218               LPVOID addr        /* [in] Suggested starting address for mapped view */
1219 ) {
1220     FILE_VIEW *view;
1221     UINT ptr = (UINT)-1, size = 0;
1222     int flags = MAP_PRIVATE;
1223     int unix_handle = -1;
1224     int prot;
1225     struct get_mapping_info_request *req = get_req_buffer();
1226
1227     /* Check parameters */
1228
1229     if ((offset_low & granularity_mask) ||
1230         (addr && ((UINT)addr & granularity_mask)))
1231     {
1232         SetLastError( ERROR_INVALID_PARAMETER );
1233         return NULL;
1234     }
1235
1236     req->handle = handle;
1237     if (server_call_fd( REQ_GET_MAPPING_INFO, -1, &unix_handle )) goto error;
1238
1239     if (req->size_high || offset_high)
1240         ERR("Offsets larger than 4Gb not supported\n");
1241
1242     if ((offset_low >= req->size_low) ||
1243         (count > req->size_low - offset_low))
1244     {
1245         SetLastError( ERROR_INVALID_PARAMETER );
1246         goto error;
1247     }
1248     if (count) size = ROUND_SIZE( offset_low, count );
1249     else size = req->size_low - offset_low;
1250     prot = req->protect;
1251
1252     switch(access)
1253     {
1254     case FILE_MAP_ALL_ACCESS:
1255     case FILE_MAP_WRITE:
1256     case FILE_MAP_WRITE | FILE_MAP_READ:
1257         if (!(prot & VPROT_WRITE))
1258         {
1259             SetLastError( ERROR_INVALID_PARAMETER );
1260             goto error;
1261         }
1262         flags = MAP_SHARED;
1263         /* fall through */
1264     case FILE_MAP_READ:
1265     case FILE_MAP_COPY:
1266     case FILE_MAP_COPY | FILE_MAP_READ:
1267         if (prot & VPROT_READ) break;
1268         /* fall through */
1269     default:
1270         SetLastError( ERROR_INVALID_PARAMETER );
1271         goto error;
1272     }
1273
1274     /* Map the file */
1275
1276     TRACE("handle=%x size=%x offset=%lx\n", handle, size, offset_low );
1277
1278     ptr = (UINT)FILE_dommap( unix_handle, addr, 0, size, 0, offset_low,
1279                              VIRTUAL_GetUnixProt( prot ), flags );
1280     if (ptr == (UINT)-1) {
1281         /* KB: Q125713, 25-SEP-1995, "Common File Mapping Problems and
1282          * Platform Differences":
1283          * Windows NT: ERROR_INVALID_PARAMETER
1284          * Windows 95: ERROR_INVALID_ADDRESS.
1285          * FIXME: So should we add a module dependend check here? -MM
1286          */
1287         if (errno==ENOMEM)
1288             SetLastError( ERROR_OUTOFMEMORY );
1289         else
1290             SetLastError( ERROR_INVALID_PARAMETER );
1291         goto error;
1292     }
1293
1294     if (!(view = VIRTUAL_CreateView( ptr, size, offset_low, 0, prot, handle )))
1295     {
1296         SetLastError( ERROR_OUTOFMEMORY );
1297         goto error;
1298     }
1299     if (unix_handle != -1) close( unix_handle );
1300     return (LPVOID)ptr;
1301
1302 error:
1303     if (unix_handle != -1) close( unix_handle );
1304     if (ptr != (UINT)-1) FILE_munmap( (void *)ptr, 0, size );
1305     return NULL;
1306 }
1307
1308
1309 /***********************************************************************
1310  *             FlushViewOfFile   (KERNEL32.262)
1311  * Writes to the disk a byte range within a mapped view of a file
1312  *
1313  * RETURNS
1314  *      TRUE: Success
1315  *      FALSE: Failure
1316  */
1317 BOOL WINAPI FlushViewOfFile(
1318               LPCVOID base, /* [in] Start address of byte range to flush */
1319               DWORD cbFlush /* [in] Number of bytes in range */
1320 ) {
1321     FILE_VIEW *view;
1322     UINT addr = ROUND_ADDR( base );
1323
1324     TRACE("FlushViewOfFile at %p for %ld bytes\n",
1325                      base, cbFlush );
1326
1327     if (!(view = VIRTUAL_FindView( addr )))
1328     {
1329         SetLastError( ERROR_INVALID_PARAMETER );
1330         return FALSE;
1331     }
1332     if (!cbFlush) cbFlush = view->size;
1333     if (!msync( (void *)addr, cbFlush, MS_SYNC )) return TRUE;
1334     SetLastError( ERROR_INVALID_PARAMETER );
1335     return FALSE;
1336 }
1337
1338
1339 /***********************************************************************
1340  *             UnmapViewOfFile   (KERNEL32.540)
1341  * Unmaps a mapped view of a file.
1342  *
1343  * NOTES
1344  *      Should addr be an LPCVOID?
1345  *
1346  * RETURNS
1347  *      TRUE: Success
1348  *      FALSE: Failure
1349  */
1350 BOOL WINAPI UnmapViewOfFile(
1351               LPVOID addr /* [in] Address where mapped view begins */
1352 ) {
1353     FILE_VIEW *view;
1354     UINT base = ROUND_ADDR( addr );
1355     if (!(view = VIRTUAL_FindView( base )) || (base != view->base))
1356     {
1357         SetLastError( ERROR_INVALID_PARAMETER );
1358         return FALSE;
1359     }
1360     VIRTUAL_DeleteView( view );
1361     return TRUE;
1362 }
1363
1364 /***********************************************************************
1365  *             VIRTUAL_MapFileW
1366  *
1367  * Helper function to map a file to memory:
1368  *  name                        -       file name
1369  *  [RETURN] ptr                -       pointer to mapped file
1370  */
1371 LPVOID VIRTUAL_MapFileW( LPCWSTR name )
1372 {
1373     HANDLE hFile, hMapping;
1374     LPVOID ptr = NULL;
1375
1376     hFile = CreateFileW( name, GENERIC_READ, FILE_SHARE_READ, NULL,
1377                            OPEN_EXISTING, FILE_FLAG_RANDOM_ACCESS, 0);
1378     if (hFile != INVALID_HANDLE_VALUE)
1379     {
1380         hMapping = CreateFileMappingA( hFile, NULL, PAGE_READONLY, 0, 0, NULL );
1381         CloseHandle( hFile );
1382         if (hMapping)
1383         {
1384             ptr = MapViewOfFile( hMapping, FILE_MAP_READ, 0, 0, 0 );
1385             CloseHandle( hMapping );
1386         }
1387     }
1388     return ptr;
1389 }