dlls/kernel/module.c

   1 /*
   2  * Modules
   3  *
   4  * Copyright 1995 Alexandre Julliard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include "config.h"
  22 #include "wine/port.h"
  23
  24 #include <fcntl.h>
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28 #include <sys/types.h>
  29 #ifdef HAVE_UNISTD_H
  30 # include <unistd.h>
  31 #endif
  32 #include "wine/winbase16.h"
  33 #include "winerror.h"
  34 #include "ntstatus.h"
  35 #include "windef.h"
  36 #include "winbase.h"
  37 #include "winreg.h"
  38 #include "winternl.h"
  39 #include "thread.h"
  40 #include "module.h"
  41 #include "kernel_private.h"
  42
  43 #include "wine/debug.h"
  44 #include "wine/unicode.h"
  45 #include "wine/server.h"
  46
  47 WINE_DEFAULT_DEBUG_CHANNEL(module);
  48 WINE_DECLARE_DEBUG_CHANNEL(loaddll);
  49
  50
  51 /****************************************************************************
  52  *              DisableThreadLibraryCalls (KERNEL32.@)
  53  *
  54  * Inform the module loader that thread notifications are not required for a dll.
  55  *
  56  * PARAMS
  57  *  hModule [I] Module handle to skip calls for
  58  *
  59  * RETURNS
  60  *  Success: TRUE. Thread attach and detach notifications will not be sent
  61  *           to hModule.
  62  *  Failure: FALSE. Use GetLastError() to determine the cause.
  63  *
  64  * NOTES
  65  *  This is typically called from the dll entry point of a dll during process
  66  *  attachment, for dlls that do not need to process thread notifications.
  67  */
  68 BOOL WINAPI DisableThreadLibraryCalls( HMODULE hModule )
  69 {
  70     NTSTATUS    nts = LdrDisableThreadCalloutsForDll( hModule );
  71     if (nts == STATUS_SUCCESS) return TRUE;
  72
  73     SetLastError( RtlNtStatusToDosError( nts ) );
  74     return FALSE;
  75 }
  76
  77
  78 /* Check whether a file is an OS/2 or a very old Windows executable
  79  * by testing on import of KERNEL.
  80  *
  81  * FIXME: is reading the module imports the only way of discerning
  82  *        old Windows binaries from OS/2 ones ? At least it seems so...
  83  */
  84 static enum binary_type MODULE_Decide_OS2_OldWin(HANDLE hfile, const IMAGE_DOS_HEADER *mz,
  85                                                  const IMAGE_OS2_HEADER *ne)
  86 {
  87     DWORD currpos = SetFilePointer( hfile, 0, NULL, SEEK_CUR);
  88     enum binary_type ret = BINARY_OS216;
  89     LPWORD modtab = NULL;
  90     LPSTR nametab = NULL;
  91     DWORD len;
  92     int i;
  93
  94     /* read modref table */
  95     if ( (SetFilePointer( hfile, mz->e_lfanew + ne->ne_modtab, NULL, SEEK_SET ) == -1)
  96       || (!(modtab = HeapAlloc( GetProcessHeap(), 0, ne->ne_cmod*sizeof(WORD))))
  97       || (!(ReadFile(hfile, modtab, ne->ne_cmod*sizeof(WORD), &len, NULL)))
  98       || (len != ne->ne_cmod*sizeof(WORD)) )
  99         goto broken;
 100
 101     /* read imported names table */
 102     if ( (SetFilePointer( hfile, mz->e_lfanew + ne->ne_imptab, NULL, SEEK_SET ) == -1)
 103       || (!(nametab = HeapAlloc( GetProcessHeap(), 0, ne->ne_enttab - ne->ne_imptab)))
 104       || (!(ReadFile(hfile, nametab, ne->ne_enttab - ne->ne_imptab, &len, NULL)))
 105       || (len != ne->ne_enttab - ne->ne_imptab) )
 106         goto broken;
 107
 108     for (i=0; i < ne->ne_cmod; i++)
 109     {
 110         LPSTR module = &nametab[modtab[i]];
 111         TRACE("modref: %.*s\n", module[0], &module[1]);
 112         if (!(strncmp(&module[1], "KERNEL", module[0])))
 113         { /* very old Windows file */
 114             MESSAGE("This seems to be a very old (pre-3.0) Windows executable. Expect crashes, especially if this is a real-mode binary !\n");
 115             ret = BINARY_WIN16;
 116             goto good;
 117         }
 118     }
 119
 120 broken:
 121     ERR("Hmm, an error occurred. Is this binary file broken?\n");
 122
 123 good:
 124     HeapFree( GetProcessHeap(), 0, modtab);
 125     HeapFree( GetProcessHeap(), 0, nametab);
 126     SetFilePointer( hfile, currpos, NULL, SEEK_SET); /* restore filepos */
 127     return ret;
 128 }
 129
 130 /***********************************************************************
 131  *           MODULE_GetBinaryType
 132  */
 133 enum binary_type MODULE_GetBinaryType( HANDLE hfile, void **res_start, void **res_end )
 134 {
 135     union
 136     {
 137         struct
 138         {
 139             unsigned char magic[4];
 140             unsigned char ignored[12];
 141             unsigned short type;
 142         } elf;
 143         struct
 144         {
 145             unsigned long magic;
 146             unsigned long cputype;
 147             unsigned long cpusubtype;
 148             unsigned long filetype;
 149         } macho;
 150         IMAGE_DOS_HEADER mz;
 151     } header;
 152
 153     DWORD len;
 154
 155     /* Seek to the start of the file and read the header information. */
 156     if (SetFilePointer( hfile, 0, NULL, SEEK_SET ) == -1)
 157         return BINARY_UNKNOWN;
 158     if (!ReadFile( hfile, &header, sizeof(header), &len, NULL ) || len != sizeof(header))
 159         return BINARY_UNKNOWN;
 160
 161     if (!memcmp( header.elf.magic, "\177ELF", 4 ))
 162     {
 163         /* FIXME: we don't bother to check byte order, architecture, etc. */
 164         switch(header.elf.type)
 165         {
 166         case 2: return BINARY_UNIX_EXE;
 167         case 3: return BINARY_UNIX_LIB;
 168         }
 169         return BINARY_UNKNOWN;
 170     }
 171
 172     /* Mach-o File with Endian set to Big Endian or Little Endian */
 173     if (header.macho.magic == 0xfeedface || header.macho.magic == 0xecafdeef)
 174     {
 175         switch(header.macho.filetype)
 176         {
 177             case 0x8: /* MH_BUNDLE */ return BINARY_UNIX_LIB;
 178         }
 179         return BINARY_UNKNOWN;
 180     }
 181
 182     /* Not ELF, try DOS */
 183
 184     if (header.mz.e_magic == IMAGE_DOS_SIGNATURE)
 185     {
 186         union
 187         {
 188             IMAGE_OS2_HEADER os2;
 189             IMAGE_NT_HEADERS nt;
 190         } ext_header;
 191
 192         /* We do have a DOS image so we will now try to seek into
 193          * the file by the amount indicated by the field
 194          * "Offset to extended header" and read in the
 195          * "magic" field information at that location.
 196          * This will tell us if there is more header information
 197          * to read or not.
 198          */
 199         if (SetFilePointer( hfile, header.mz.e_lfanew, NULL, SEEK_SET ) == -1)
 200             return BINARY_DOS;
 201         if (!ReadFile( hfile, &ext_header, sizeof(ext_header), &len, NULL ) || len < 4)
 202             return BINARY_DOS;
 203
 204         /* Reading the magic field succeeded so
 205          * we will try to determine what type it is.
 206          */
 207         if (!memcmp( &ext_header.nt.Signature, "PE\0\0", 4 ))
 208         {
 209             if (len >= sizeof(ext_header.nt.FileHeader))
 210             {
 211                 if (len < sizeof(ext_header.nt))  /* clear remaining part of header if missing */
 212                     memset( (char *)&ext_header.nt + len, 0, sizeof(ext_header.nt) - len );
 213                 if (res_start) *res_start = (void *)ext_header.nt.OptionalHeader.ImageBase;
 214                 if (res_end) *res_end = (void *)(ext_header.nt.OptionalHeader.ImageBase +
 215                                                  ext_header.nt.OptionalHeader.SizeOfImage);
 216                 if (ext_header.nt.FileHeader.Characteristics & IMAGE_FILE_DLL) return BINARY_PE_DLL;
 217                 return BINARY_PE_EXE;
 218             }
 219             return BINARY_DOS;
 220         }
 221
 222         if (!memcmp( &ext_header.os2.ne_magic, "NE", 2 ))
 223         {
 224             /* This is a Windows executable (NE) header.  This can
 225              * mean either a 16-bit OS/2 or a 16-bit Windows or even a
 226              * DOS program (running under a DOS extender).  To decide
 227              * which, we'll have to read the NE header.
 228              */
 229             if (len >= sizeof(ext_header.os2))
 230             {
 231                 switch ( ext_header.os2.ne_exetyp )
 232                 {
 233                 case 1:  return BINARY_OS216; /* OS/2 */
 234                 case 2:  return BINARY_WIN16; /* Windows */
 235                 case 3:  return BINARY_DOS; /* European MS-DOS 4.x */
 236                 case 4:  return BINARY_WIN16; /* Windows 386; FIXME: is this 32bit??? */
 237                 case 5:  return BINARY_DOS; /* BOSS, Borland Operating System Services */
 238                 /* other types, e.g. 0 is: "unknown" */
 239                 default: return MODULE_Decide_OS2_OldWin(hfile, &header.mz, &ext_header.os2);
 240                 }
 241             }
 242             /* Couldn't read header, so abort. */
 243             return BINARY_DOS;
 244         }
 245
 246         /* Unknown extended header, but this file is nonetheless DOS-executable. */
 247         return BINARY_DOS;
 248     }
 249
 250     return BINARY_UNKNOWN;
 251 }
 252
 253 /***********************************************************************
 254  *             GetBinaryTypeW                     [KERNEL32.@]
 255  *
 256  * Determine whether a file is executable, and if so, what kind.
 257  *
 258  * PARAMS
 259  *  lpApplicationName [I] Path of the file to check
 260  *  lpBinaryType      [O] Destination for the binary type
 261  *
 262  * RETURNS
 263  *  TRUE, if the file is an executable, in which case lpBinaryType is set.
 264  *  FALSE, if the file is not an executable or if the function fails.
 265  *
 266  * NOTES
 267  *  The type of executable is a property that determines which subsytem an
 268  *  executable file runs under. lpBinaryType can be set to one of the following
 269  *  values:
 270  *   SCS_32BIT_BINARY: A Win32 based application
 271  *   SCS_DOS_BINARY: An MS-Dos based application
 272  *   SCS_WOW_BINARY: A Win16 based application
 273  *   SCS_PIF_BINARY: A PIF file that executes an MS-Dos based app
 274  *   SCS_POSIX_BINARY: A POSIX based application ( Not implemented )
 275  *   SCS_OS216_BINARY: A 16bit OS/2 based application
 276  *
 277  *  To find the binary type, this function reads in the files header information.
 278  *  If extended header information is not present it will assume that the file
 279  *  is a DOS executable. If extended header information is present it will
 280  *  determine if the file is a 16 or 32 bit Windows executable by checking the
 281  *  flags in the header.
 282  *
 283  *  ".com" and ".pif" files are only recognized by their file name extension,
 284  *  as per native Windows.
 285  */
 286 BOOL WINAPI GetBinaryTypeW( LPCWSTR lpApplicationName, LPDWORD lpBinaryType )
 287 {
 288     BOOL ret = FALSE;
 289     HANDLE hfile;
 290
 291     TRACE("%s\n", debugstr_w(lpApplicationName) );
 292
 293     /* Sanity check.
 294      */
 295     if ( lpApplicationName == NULL || lpBinaryType == NULL )
 296         return FALSE;
 297
 298     /* Open the file indicated by lpApplicationName for reading.
 299      */
 300     hfile = CreateFileW( lpApplicationName, GENERIC_READ, FILE_SHARE_READ,
 301                          NULL, OPEN_EXISTING, 0, 0 );
 302     if ( hfile == INVALID_HANDLE_VALUE )
 303         return FALSE;
 304
 305     /* Check binary type
 306      */
 307     switch(MODULE_GetBinaryType( hfile, NULL, NULL ))
 308     {
 309     case BINARY_UNKNOWN:
 310     {
 311         static const WCHAR comW[] = { '.','C','O','M',0 };
 312         static const WCHAR pifW[] = { '.','P','I','F',0 };
 313         const WCHAR *ptr;
 314
 315         /* try to determine from file name */
 316         ptr = strrchrW( lpApplicationName, '.' );
 317         if (!ptr) break;
 318         if (!strcmpiW( ptr, comW ))
 319         {
 320             *lpBinaryType = SCS_DOS_BINARY;
 321             ret = TRUE;
 322         }
 323         else if (!strcmpiW( ptr, pifW ))
 324         {
 325             *lpBinaryType = SCS_PIF_BINARY;
 326             ret = TRUE;
 327         }
 328         break;
 329     }
 330     case BINARY_PE_EXE:
 331     case BINARY_PE_DLL:
 332         *lpBinaryType = SCS_32BIT_BINARY;
 333         ret = TRUE;
 334         break;
 335     case BINARY_WIN16:
 336         *lpBinaryType = SCS_WOW_BINARY;
 337         ret = TRUE;
 338         break;
 339     case BINARY_OS216:
 340         *lpBinaryType = SCS_OS216_BINARY;
 341         ret = TRUE;
 342         break;
 343     case BINARY_DOS:
 344         *lpBinaryType = SCS_DOS_BINARY;
 345         ret = TRUE;
 346         break;
 347     case BINARY_UNIX_EXE:
 348     case BINARY_UNIX_LIB:
 349         ret = FALSE;
 350         break;
 351     }
 352
 353     CloseHandle( hfile );
 354     return ret;
 355 }
 356
 357 /***********************************************************************
 358  *             GetBinaryTypeA                     [KERNEL32.@]
 359  *             GetBinaryType                      [KERNEL32.@]
 360  */
 361 BOOL WINAPI GetBinaryTypeA( LPCSTR lpApplicationName, LPDWORD lpBinaryType )
 362 {
 363     ANSI_STRING app_nameA;
 364     NTSTATUS status;
 365
 366     TRACE("%s\n", debugstr_a(lpApplicationName));
 367
 368     /* Sanity check.
 369      */
 370     if ( lpApplicationName == NULL || lpBinaryType == NULL )
 371         return FALSE;
 372
 373     RtlInitAnsiString(&app_nameA, lpApplicationName);
 374     status = RtlAnsiStringToUnicodeString(&NtCurrentTeb()->StaticUnicodeString,
 375                                           &app_nameA, FALSE);
 376     if (!status)
 377         return GetBinaryTypeW(NtCurrentTeb()->StaticUnicodeString.Buffer, lpBinaryType);
 378
 379     SetLastError(RtlNtStatusToDosError(status));
 380     return FALSE;
 381 }
 382
 383
 384 /***********************************************************************
 385  *              GetModuleHandleA         (KERNEL32.@)
 386  *              GetModuleHandle32        (KERNEL.488)
 387  *
 388  * Get the handle of a dll loaded into the process address space.
 389  *
 390  * PARAMS
 391  *  module [I] Name of the dll
 392  *
 393  * RETURNS
 394  *  Success: A handle to the loaded dll.
 395  *  Failure: A NULL handle. Use GetLastError() to determine the cause.
 396  */
 397 HMODULE WINAPI GetModuleHandleA(LPCSTR module)
 398 {
 399     WCHAR *moduleW;
 400
 401     if (!module) return NtCurrentTeb()->Peb->ImageBaseAddress;
 402     if (!(moduleW = FILE_name_AtoW( module, FALSE ))) return 0;
 403     return GetModuleHandleW( moduleW );
 404 }
 405
 406 /***********************************************************************
 407  *              GetModuleHandleW (KERNEL32.@)
 408  *
 409  * Unicode version of GetModuleHandleA.
 410  */
 411 HMODULE WINAPI GetModuleHandleW(LPCWSTR module)
 412 {
 413     NTSTATUS            nts;
 414     HMODULE             ret;
 415     UNICODE_STRING      wstr;
 416
 417     if (!module) return NtCurrentTeb()->Peb->ImageBaseAddress;
 418
 419     RtlInitUnicodeString( &wstr, module );
 420     nts = LdrGetDllHandle( 0, 0, &wstr, &ret);
 421     if (nts != STATUS_SUCCESS)
 422     {
 423         SetLastError( RtlNtStatusToDosError( nts ) );
 424         ret = 0;
 425     }
 426     return ret;
 427 }
 428
 429
 430 /***********************************************************************
 431  *              GetModuleFileNameA      (KERNEL32.@)
 432  *              GetModuleFileName32     (KERNEL.487)
 433  *
 434  * Get the file name of a loaded module from its handle.
 435  *
 436  * RETURNS
 437  *  Success: The length of the file name, excluding the terminating NUL.
 438  *  Failure: 0. Use GetLastError() to determine the cause.
 439  *
 440  * NOTES
 441  *  This function always returns the long path of hModule (as opposed to
 442  *  GetModuleFileName16() which returns short paths when the modules version
 443  *  field is < 4.0).
 444  *  The function doesn't write a terminating '\0' if the buffer is too
 445  *  small.
 446  */
 447 DWORD WINAPI GetModuleFileNameA(
 448         HMODULE hModule,        /* [in] Module handle (32 bit) */
 449         LPSTR lpFileName,       /* [out] Destination for file name */
 450         DWORD size )            /* [in] Size of lpFileName in characters */
 451 {
 452     LPWSTR filenameW = HeapAlloc( GetProcessHeap(), 0, size * sizeof(WCHAR) );
 453     DWORD len;
 454
 455     if (!filenameW)
 456     {
 457         SetLastError( ERROR_NOT_ENOUGH_MEMORY );
 458         return 0;
 459     }
 460     if ((len = GetModuleFileNameW( hModule, filenameW, size )))
 461     {
 462         len = FILE_name_WtoA( filenameW, len, lpFileName, size );
 463         if (len < size) lpFileName[len] = '\0';
 464     }
 465     HeapFree( GetProcessHeap(), 0, filenameW );
 466     return len;
 467 }
 468
 469 /***********************************************************************
 470  *              GetModuleFileNameW      (KERNEL32.@)
 471  *
 472  * Unicode version of GetModuleFileNameA.
 473  */
 474 DWORD WINAPI GetModuleFileNameW( HMODULE hModule, LPWSTR lpFileName, DWORD size )
 475 {
 476     ULONG magic, len = 0;
 477     LDR_MODULE *pldr;
 478     NTSTATUS nts;
 479     WIN16_SUBSYSTEM_TIB *win16_tib;
 480
 481     if (!hModule && ((win16_tib = NtCurrentTeb()->Tib.SubSystemTib)) && win16_tib->exe_name)
 482     {
 483         len = min(size, win16_tib->exe_name->Length / sizeof(WCHAR));
 484         memcpy( lpFileName, win16_tib->exe_name->Buffer, len * sizeof(WCHAR) );
 485         if (len < size) lpFileName[len] = '\0';
 486         goto done;
 487     }
 488
 489     LdrLockLoaderLock( 0, NULL, &magic );
 490
 491     if (!hModule) hModule = NtCurrentTeb()->Peb->ImageBaseAddress;
 492     nts = LdrFindEntryForAddress( hModule, &pldr );
 493     if (nts == STATUS_SUCCESS)
 494     {
 495         len = min(size, pldr->FullDllName.Length / sizeof(WCHAR));
 496         memcpy(lpFileName, pldr->FullDllName.Buffer, len * sizeof(WCHAR));
 497         if (len < size) lpFileName[len] = '\0';
 498     }
 499     else SetLastError( RtlNtStatusToDosError( nts ) );
 500
 501     LdrUnlockLoaderLock( 0, magic );
 502 done:
 503     TRACE( "%s\n", debugstr_wn(lpFileName, len) );
 504     return len;
 505 }
 506
 507
 508 /***********************************************************************
 509  *           get_dll_system_path
 510  */
 511 static const WCHAR *get_dll_system_path(void)
 512 {
 513     static WCHAR *cached_path;
 514
 515     if (!cached_path)
 516     {
 517         WCHAR *p, *path;
 518         int len = 3;
 519
 520         len += GetSystemDirectoryW( NULL, 0 );
 521         len += GetWindowsDirectoryW( NULL, 0 );
 522         p = path = HeapAlloc( GetProcessHeap(), 0, len * sizeof(WCHAR) );
 523         *p++ = '.';
 524         *p++ = ';';
 525         GetSystemDirectoryW( p, path + len - p);
 526         p += strlenW(p);
 527         *p++ = ';';
 528         GetWindowsDirectoryW( p, path + len - p);
 529         cached_path = path;
 530     }
 531     return cached_path;
 532 }
 533
 534
 535 /******************************************************************
 536  *              MODULE_get_dll_load_path
 537  *
 538  * Compute the load path to use for a given dll.
 539  * Returned pointer must be freed by caller.
 540  */
 541 WCHAR *MODULE_get_dll_load_path( LPCWSTR module )
 542 {
 543     static const WCHAR pathW[] = {'P','A','T','H',0};
 544
 545     const WCHAR *system_path = get_dll_system_path();
 546     const WCHAR *mod_end = NULL;
 547     UNICODE_STRING name, value;
 548     WCHAR *p, *ret;
 549     int len = 0, path_len = 0;
 550
 551     /* adjust length for module name */
 552
 553     if (!module) module = NtCurrentTeb()->Peb->ProcessParameters->ImagePathName.Buffer;
 554     if (module)
 555     {
 556         mod_end = module;
 557         if ((p = strrchrW( mod_end, '\\' ))) mod_end = p;
 558         if ((p = strrchrW( mod_end, '/' ))) mod_end = p;
 559         if (mod_end == module + 2 && module[1] == ':') mod_end++;
 560         if (mod_end == module && module[0] && module[1] == ':') mod_end += 2;
 561         len += (mod_end - module) + 1;
 562     }
 563     len += strlenW( system_path ) + 2;
 564
 565     /* get the PATH variable */
 566
 567     RtlInitUnicodeString( &name, pathW );
 568     value.Length = 0;
 569     value.MaximumLength = 0;
 570     value.Buffer = NULL;
 571     if (RtlQueryEnvironmentVariable_U( NULL, &name, &value ) == STATUS_BUFFER_TOO_SMALL)
 572         path_len = value.Length;
 573
 574     if (!(ret = HeapAlloc( GetProcessHeap(), 0, path_len + len * sizeof(WCHAR) ))) return NULL;
 575     p = ret;
 576     if (module)
 577     {
 578         memcpy( ret, module, (mod_end - module) * sizeof(WCHAR) );
 579         p += (mod_end - module);
 580         *p++ = ';';
 581     }
 582     strcpyW( p, system_path );
 583     p += strlenW(p);
 584     *p++ = ';';
 585     value.Buffer = p;
 586     value.MaximumLength = path_len;
 587
 588     while (RtlQueryEnvironmentVariable_U( NULL, &name, &value ) == STATUS_BUFFER_TOO_SMALL)
 589     {
 590         WCHAR *new_ptr;
 591
 592         /* grow the buffer and retry */
 593         path_len = value.Length;
 594         if (!(new_ptr = HeapReAlloc( GetProcessHeap(), 0, ret, path_len + len * sizeof(WCHAR) )))
 595         {
 596             HeapFree( GetProcessHeap(), 0, ret );
 597             return NULL;
 598         }
 599         value.Buffer = new_ptr + (value.Buffer - ret);
 600         value.MaximumLength = path_len;
 601         ret = new_ptr;
 602     }
 603     value.Buffer[value.Length / sizeof(WCHAR)] = 0;
 604     return ret;
 605 }
 606
 607
 608 /******************************************************************
 609  *              load_library_as_datafile
 610  */
 611 static BOOL load_library_as_datafile( LPCWSTR name, HMODULE* hmod)
 612 {
 613     static const WCHAR dotDLL[] = {'.','d','l','l',0};
 614
 615     WCHAR filenameW[MAX_PATH];
 616     HANDLE hFile = INVALID_HANDLE_VALUE;
 617     HANDLE mapping;
 618     HMODULE module;
 619
 620     *hmod = 0;
 621
 622     if (SearchPathW( NULL, (LPCWSTR)name, dotDLL, sizeof(filenameW) / sizeof(filenameW[0]),
 623                      filenameW, NULL ))
 624     {
 625         hFile = CreateFileW( filenameW, GENERIC_READ, FILE_SHARE_READ,
 626                              NULL, OPEN_EXISTING, 0, 0 );
 627     }
 628     if (hFile == INVALID_HANDLE_VALUE) return FALSE;
 629
 630     mapping = CreateFileMappingW( hFile, NULL, PAGE_READONLY, 0, 0, NULL );
 631     CloseHandle( hFile );
 632     if (!mapping) return FALSE;
 633
 634     module = MapViewOfFile( mapping, FILE_MAP_READ, 0, 0, 0 );
 635     CloseHandle( mapping );
 636     if (!module) return FALSE;
 637
 638     /* make sure it's a valid PE file */
 639     if (!RtlImageNtHeader(module))
 640     {
 641         UnmapViewOfFile( module );
 642         return FALSE;
 643     }
 644     *hmod = (HMODULE)((char *)module + 1);  /* set low bit of handle to indicate datafile module */
 645     return TRUE;
 646 }
 647
 648
 649 /******************************************************************
 650  *              load_library
 651  *
 652  * Helper for LoadLibraryExA/W.
 653  */
 654 static HMODULE load_library( const UNICODE_STRING *libname, DWORD flags )
 655 {
 656     NTSTATUS nts;
 657     HMODULE hModule;
 658     WCHAR *load_path;
 659
 660     if (flags & LOAD_LIBRARY_AS_DATAFILE)
 661     {
 662         /* The method in load_library_as_datafile allows searching for the
 663          * 'native' libraries only
 664          */
 665         if (load_library_as_datafile( libname->Buffer, &hModule )) return hModule;
 666         flags |= DONT_RESOLVE_DLL_REFERENCES; /* Just in case */
 667         /* Fallback to normal behaviour */
 668     }
 669
 670     load_path = MODULE_get_dll_load_path( flags & LOAD_WITH_ALTERED_SEARCH_PATH ? libname->Buffer : NULL );
 671     nts = LdrLoadDll( load_path, flags, libname, &hModule );
 672     HeapFree( GetProcessHeap(), 0, load_path );
 673     if (nts != STATUS_SUCCESS)
 674     {
 675         hModule = 0;
 676         SetLastError( RtlNtStatusToDosError( nts ) );
 677     }
 678     return hModule;
 679 }
 680
 681
 682 /******************************************************************
 683  *              LoadLibraryExA          (KERNEL32.@)
 684  *
 685  * Load a dll file into the process address space.
 686  *
 687  * PARAMS
 688  *  libname [I] Name of the file to load
 689  *  hfile   [I] Reserved, must be 0.
 690  *  flags   [I] Flags for loading the dll
 691  *
 692  * RETURNS
 693  *  Success: A handle to the loaded dll.
 694  *  Failure: A NULL handle. Use GetLastError() to determine the cause.
 695  *
 696  * NOTES
 697  * The HFILE parameter is not used and marked reserved in the SDK. I can
 698  * only guess that it should force a file to be mapped, but I rather
 699  * ignore the parameter because it would be extremely difficult to
 700  * integrate this with different types of module representations.
 701  */
 702 HMODULE WINAPI LoadLibraryExA(LPCSTR libname, HANDLE hfile, DWORD flags)
 703 {
 704     WCHAR *libnameW;
 705
 706     if (!(libnameW = FILE_name_AtoW( libname, FALSE ))) return 0;
 707     return LoadLibraryExW( libnameW, hfile, flags );
 708 }
 709
 710 /***********************************************************************
 711  *           LoadLibraryExW       (KERNEL32.@)
 712  *
 713  * Unicode version of LoadLibraryExA.
 714  */
 715 HMODULE WINAPI LoadLibraryExW(LPCWSTR libnameW, HANDLE hfile, DWORD flags)
 716 {
 717     UNICODE_STRING      wstr;
 718
 719     if (!libnameW)
 720     {
 721         SetLastError(ERROR_INVALID_PARAMETER);
 722         return 0;
 723     }
 724     RtlInitUnicodeString( &wstr, libnameW );
 725     return load_library( &wstr, flags );
 726 }
 727
 728 /***********************************************************************
 729  *           LoadLibraryA         (KERNEL32.@)
 730  *
 731  * Load a dll file into the process address space.
 732  *
 733  * PARAMS
 734  *  libname [I] Name of the file to load
 735  *
 736  * RETURNS
 737  *  Success: A handle to the loaded dll.
 738  *  Failure: A NULL handle. Use GetLastError() to determine the cause.
 739  *
 740  * NOTES
 741  * See LoadLibraryExA().
 742  */
 743 HMODULE WINAPI LoadLibraryA(LPCSTR libname)
 744 {
 745     return LoadLibraryExA(libname, 0, 0);
 746 }
 747
 748 /***********************************************************************
 749  *           LoadLibraryW         (KERNEL32.@)
 750  *
 751  * Unicode version of LoadLibraryA.
 752  */
 753 HMODULE WINAPI LoadLibraryW(LPCWSTR libnameW)
 754 {
 755     return LoadLibraryExW(libnameW, 0, 0);
 756 }
 757
 758 /***********************************************************************
 759  *           FreeLibrary   (KERNEL32.@)
 760  *           FreeLibrary32 (KERNEL.486)
 761  *
 762  * Free a dll loaded into the process address space.
 763  *
 764  * PARAMS
 765  *  hLibModule [I] Handle to the dll returned by LoadLibraryA().
 766  *
 767  * RETURNS
 768  *  Success: TRUE. The dll is removed if it is not still in use.
 769  *  Failure: FALSE. Use GetLastError() to determine the cause.
 770  */
 771 BOOL WINAPI FreeLibrary(HINSTANCE hLibModule)
 772 {
 773     BOOL                retv = FALSE;
 774     NTSTATUS            nts;
 775
 776     if (!hLibModule)
 777     {
 778         SetLastError( ERROR_INVALID_HANDLE );
 779         return FALSE;
 780     }
 781
 782     if ((ULONG_PTR)hLibModule & 1)
 783     {
 784         /* this is a LOAD_LIBRARY_AS_DATAFILE module */
 785         char *ptr = (char *)hLibModule - 1;
 786         UnmapViewOfFile( ptr );
 787         return TRUE;
 788     }
 789
 790     if ((nts = LdrUnloadDll( hLibModule )) == STATUS_SUCCESS) retv = TRUE;
 791     else SetLastError( RtlNtStatusToDosError( nts ) );
 792
 793     return retv;
 794 }
 795
 796 /***********************************************************************
 797  *           GetProcAddress             (KERNEL32.@)
 798  *
 799  * Find the address of an exported symbol in a loaded dll.
 800  *
 801  * PARAMS
 802  *  hModule  [I] Handle to the dll returned by LoadLibraryA().
 803  *  function [I] Name of the symbol, or an integer ordinal number < 16384
 804  *
 805  * RETURNS
 806  *  Success: A pointer to the symbol in the process address space.
 807  *  Failure: NULL. Use GetLastError() to determine the cause.
 808  */
 809 FARPROC WINAPI GetProcAddress( HMODULE hModule, LPCSTR function )
 810 {
 811     NTSTATUS    nts;
 812     FARPROC     fp;
 813
 814     if (HIWORD(function))
 815     {
 816         ANSI_STRING     str;
 817
 818         RtlInitAnsiString( &str, function );
 819         nts = LdrGetProcedureAddress( hModule, &str, 0, (void**)&fp );
 820     }
 821     else
 822         nts = LdrGetProcedureAddress( hModule, NULL, (DWORD)function, (void**)&fp );
 823     if (nts != STATUS_SUCCESS)
 824     {
 825         SetLastError( RtlNtStatusToDosError( nts ) );
 826         fp = NULL;
 827     }
 828     return fp;
 829 }
 830
 831 /***********************************************************************
 832  *           GetProcAddress32                   (KERNEL.453)
 833  *
 834  * Find the address of an exported symbol in a loaded dll.
 835  *
 836  * PARAMS
 837  *  hModule  [I] Handle to the dll returned by LoadLibraryA().
 838  *  function [I] Name of the symbol, or an integer ordinal number < 16384
 839  *
 840  * RETURNS
 841  *  Success: A pointer to the symbol in the process address space.
 842  *  Failure: NULL. Use GetLastError() to determine the cause.
 843  */
 844 FARPROC WINAPI GetProcAddress32_16( HMODULE hModule, LPCSTR function )
 845 {
 846     /* FIXME: we used to disable snoop when returning proc for Win16 subsystem */
 847     return GetProcAddress( hModule, function );
 848 }