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 #ifdef HAVE_SYS_TYPES_H
  29 # include <sys/types.h>
  30 #endif
  31 #ifdef HAVE_UNISTD_H
  32 # include <unistd.h>
  33 #endif
  34 #include "wine/winbase16.h"
  35 #include "winerror.h"
  36 #include "ntstatus.h"
  37 #include "windef.h"
  38 #include "winbase.h"
  39 #include "winreg.h"
  40 #include "winternl.h"
  41 #include "thread.h"
  42 #include "module.h"
  43
  44 #include "wine/debug.h"
  45 #include "wine/unicode.h"
  46 #include "wine/server.h"
  47
  48 WINE_DEFAULT_DEBUG_CHANNEL(module);
  49 WINE_DECLARE_DEBUG_CHANNEL(loaddll);
  50
  51
  52 /****************************************************************************
  53  *              DisableThreadLibraryCalls (KERNEL32.@)
  54  *
  55  * Inform the module loader that thread notifications are not required for a dll.
  56  *
  57  * PARAMS
  58  *  hModule [I] Module handle to skip calls for
  59  *
  60  * RETURNS
  61  *  Success: TRUE. Thread attach and detach notifications will not be sent
  62  *           to hModule.
  63  *  Failure: FALSE. Use GetLastError() to determine the cause.
  64  *
  65  * NOTES
  66  *  This is typically called from the dll entry point of a dll during process
  67  *  attachment, for dlls that do not need to process thread notifications.
  68  */
  69 BOOL WINAPI DisableThreadLibraryCalls( HMODULE hModule )
  70 {
  71     NTSTATUS    nts = LdrDisableThreadCalloutsForDll( hModule );
  72     if (nts == STATUS_SUCCESS) return TRUE;
  73
  74     SetLastError( RtlNtStatusToDosError( nts ) );
  75     return FALSE;
  76 }
  77
  78
  79 /* Check whether a file is an OS/2 or a very old Windows executable
  80  * by testing on import of KERNEL.
  81  *
  82  * FIXME: is reading the module imports the only way of discerning
  83  *        old Windows binaries from OS/2 ones ? At least it seems so...
  84  */
  85 static enum binary_type MODULE_Decide_OS2_OldWin(HANDLE hfile, const IMAGE_DOS_HEADER *mz,
  86                                                  const IMAGE_OS2_HEADER *ne)
  87 {
  88     DWORD currpos = SetFilePointer( hfile, 0, NULL, SEEK_CUR);
  89     enum binary_type ret = BINARY_OS216;
  90     LPWORD modtab = NULL;
  91     LPSTR nametab = NULL;
  92     DWORD len;
  93     int i;
  94
  95     /* read modref table */
  96     if ( (SetFilePointer( hfile, mz->e_lfanew + ne->ne_modtab, NULL, SEEK_SET ) == -1)
  97       || (!(modtab = HeapAlloc( GetProcessHeap(), 0, ne->ne_cmod*sizeof(WORD))))
  98       || (!(ReadFile(hfile, modtab, ne->ne_cmod*sizeof(WORD), &len, NULL)))
  99       || (len != ne->ne_cmod*sizeof(WORD)) )
 100         goto broken;
 101
 102     /* read imported names table */
 103     if ( (SetFilePointer( hfile, mz->e_lfanew + ne->ne_imptab, NULL, SEEK_SET ) == -1)
 104       || (!(nametab = HeapAlloc( GetProcessHeap(), 0, ne->ne_enttab - ne->ne_imptab)))
 105       || (!(ReadFile(hfile, nametab, ne->ne_enttab - ne->ne_imptab, &len, NULL)))
 106       || (len != ne->ne_enttab - ne->ne_imptab) )
 107         goto broken;
 108
 109     for (i=0; i < ne->ne_cmod; i++)
 110     {
 111         LPSTR module = &nametab[modtab[i]];
 112         TRACE("modref: %.*s\n", module[0], &module[1]);
 113         if (!(strncmp(&module[1], "KERNEL", module[0])))
 114         { /* very old Windows file */
 115             MESSAGE("This seems to be a very old (pre-3.0) Windows executable. Expect crashes, especially if this is a real-mode binary !\n");
 116             ret = BINARY_WIN16;
 117             goto good;
 118         }
 119     }
 120
 121 broken:
 122     ERR("Hmm, an error occurred. Is this binary file broken ?\n");
 123
 124 good:
 125     HeapFree( GetProcessHeap(), 0, modtab);
 126     HeapFree( GetProcessHeap(), 0, nametab);
 127     SetFilePointer( hfile, currpos, NULL, SEEK_SET); /* restore filepos */
 128     return ret;
 129 }
 130
 131 /***********************************************************************
 132  *           MODULE_GetBinaryType
 133  */
 134 enum binary_type MODULE_GetBinaryType( HANDLE hfile )
 135 {
 136     union
 137     {
 138         struct
 139         {
 140             unsigned char magic[4];
 141             unsigned char ignored[12];
 142             unsigned short type;
 143         } elf;
 144         struct
 145         {
 146             unsigned long magic;
 147             unsigned long cputype;
 148             unsigned long cpusubtype;
 149             unsigned long filetype;
 150         } macho;
 151         IMAGE_DOS_HEADER mz;
 152     } header;
 153
 154     char magic[4];
 155     DWORD len;
 156
 157     /* Seek to the start of the file and read the header information. */
 158     if (SetFilePointer( hfile, 0, NULL, SEEK_SET ) == -1)
 159         return BINARY_UNKNOWN;
 160     if (!ReadFile( hfile, &header, sizeof(header), &len, NULL ) || len != sizeof(header))
 161         return BINARY_UNKNOWN;
 162
 163     if (!memcmp( header.elf.magic, "\177ELF", 4 ))
 164     {
 165         /* FIXME: we don't bother to check byte order, architecture, etc. */
 166         switch(header.elf.type)
 167         {
 168         case 2: return BINARY_UNIX_EXE;
 169         case 3: return BINARY_UNIX_LIB;
 170         }
 171         return BINARY_UNKNOWN;
 172     }
 173
 174     /* Mach-o File with Endian set to Big Endian  or Little Endian*/
 175     if (header.macho.magic == 0xfeedface || header.macho.magic == 0xecafdeef)
 176     {
 177         switch(header.macho.filetype)
 178         {
 179             case 0x8: /* MH_BUNDLE */ return BINARY_UNIX_LIB;
 180         }
 181         return BINARY_UNKNOWN;
 182     }
 183
 184     /* Not ELF, try DOS */
 185
 186     if (header.mz.e_magic == IMAGE_DOS_SIGNATURE)
 187     {
 188         /* We do have a DOS image so we will now try to seek into
 189          * the file by the amount indicated by the field
 190          * "Offset to extended header" and read in the
 191          * "magic" field information at that location.
 192          * This will tell us if there is more header information
 193          * to read or not.
 194          */
 195         if (SetFilePointer( hfile, header.mz.e_lfanew, NULL, SEEK_SET ) == -1)
 196             return BINARY_DOS;
 197         if (!ReadFile( hfile, magic, sizeof(magic), &len, NULL ) || len != sizeof(magic))
 198             return BINARY_DOS;
 199
 200         /* Reading the magic field succeeded so
 201          * we will try to determine what type it is.
 202          */
 203         if (!memcmp( magic, "PE\0\0", 4 ))
 204         {
 205             IMAGE_FILE_HEADER FileHeader;
 206
 207             if (ReadFile( hfile, &FileHeader, sizeof(FileHeader), &len, NULL ) && len == sizeof(FileHeader))
 208             {
 209                 if (FileHeader.Characteristics & IMAGE_FILE_DLL) return BINARY_PE_DLL;
 210                 return BINARY_PE_EXE;
 211             }
 212             return BINARY_DOS;
 213         }
 214
 215         if (!memcmp( magic, "NE", 2 ))
 216         {
 217             /* This is a Windows executable (NE) header.  This can
 218              * mean either a 16-bit OS/2 or a 16-bit Windows or even a
 219              * DOS program (running under a DOS extender).  To decide
 220              * which, we'll have to read the NE header.
 221              */
 222             IMAGE_OS2_HEADER ne;
 223             if (    SetFilePointer( hfile, header.mz.e_lfanew, NULL, SEEK_SET ) != -1
 224                     && ReadFile( hfile, &ne, sizeof(ne), &len, NULL )
 225                     && len == sizeof(ne) )
 226             {
 227                 switch ( ne.ne_exetyp )
 228                 {
 229                 case 2:  return BINARY_WIN16;
 230                 case 5:  return BINARY_DOS;
 231                 default: return MODULE_Decide_OS2_OldWin(hfile, &header.mz, &ne);
 232                 }
 233             }
 234             /* Couldn't read header, so abort. */
 235             return BINARY_DOS;
 236         }
 237
 238         /* Unknown extended header, but this file is nonetheless DOS-executable. */
 239         return BINARY_DOS;
 240     }
 241
 242     return BINARY_UNKNOWN;
 243 }
 244
 245 /***********************************************************************
 246  *             GetBinaryTypeW                     [KERNEL32.@]
 247  *
 248  * Determine whether a file is executable, and if so, what kind.
 249  *
 250  * PARAMS
 251  *  lpApplicationName [I] Path of the file to check
 252  *  lpBinaryType      [O] Destination for the binary type
 253  *
 254  * RETURNS
 255  *  TRUE, if the file is an executable, in which case lpBinaryType is set.
 256  *  FALSE, if the file is not an executable or if the function fails.
 257  *
 258  * NOTES
 259  *  The type of executable is a property that determines which subsytem an
 260  *  executable file runs under. lpBinaryType can be set to one of the following
 261  *  values:
 262  *   SCS_32BIT_BINARY: A Win32 based application
 263  *   SCS_DOS_BINARY: An MS-Dos based application
 264  *   SCS_WOW_BINARY: A Win16 based application
 265  *   SCS_PIF_BINARY: A PIF file that executes an MS-Dos based app
 266  *   SCS_POSIX_BINARY: A POSIX based application ( Not implemented )
 267  *   SCS_OS216_BINARY: A 16bit OS/2 based application
 268  *
 269  *  To find the binary type, this function reads in the files header information.
 270  *  If extended header information is not present it will assume that the file
 271  *  is a DOS executable. If extended header information is present it will
 272  *  determine if the file is a 16 or 32 bit Windows executable by checking the
 273  *  flags in the header.
 274  *
 275  *  ".com" and ".pif" files are only recognized by their file name extension,
 276  *  as per native Windows.
 277  */
 278 BOOL WINAPI GetBinaryTypeW( LPCWSTR lpApplicationName, LPDWORD lpBinaryType )
 279 {
 280     BOOL ret = FALSE;
 281     HANDLE hfile;
 282
 283     TRACE("%s\n", debugstr_w(lpApplicationName) );
 284
 285     /* Sanity check.
 286      */
 287     if ( lpApplicationName == NULL || lpBinaryType == NULL )
 288         return FALSE;
 289
 290     /* Open the file indicated by lpApplicationName for reading.
 291      */
 292     hfile = CreateFileW( lpApplicationName, GENERIC_READ, FILE_SHARE_READ,
 293                          NULL, OPEN_EXISTING, 0, 0 );
 294     if ( hfile == INVALID_HANDLE_VALUE )
 295         return FALSE;
 296
 297     /* Check binary type
 298      */
 299     switch(MODULE_GetBinaryType( hfile ))
 300     {
 301     case BINARY_UNKNOWN:
 302     {
 303         static const WCHAR comW[] = { '.','C','O','M',0 };
 304         static const WCHAR pifW[] = { '.','P','I','F',0 };
 305         const WCHAR *ptr;
 306
 307         /* try to determine from file name */
 308         ptr = strrchrW( lpApplicationName, '.' );
 309         if (!ptr) break;
 310         if (!strcmpiW( ptr, comW ))
 311         {
 312             *lpBinaryType = SCS_DOS_BINARY;
 313             ret = TRUE;
 314         }
 315         else if (!strcmpiW( ptr, pifW ))
 316         {
 317             *lpBinaryType = SCS_PIF_BINARY;
 318             ret = TRUE;
 319         }
 320         break;
 321     }
 322     case BINARY_PE_EXE:
 323     case BINARY_PE_DLL:
 324         *lpBinaryType = SCS_32BIT_BINARY;
 325         ret = TRUE;
 326         break;
 327     case BINARY_WIN16:
 328         *lpBinaryType = SCS_WOW_BINARY;
 329         ret = TRUE;
 330         break;
 331     case BINARY_OS216:
 332         *lpBinaryType = SCS_OS216_BINARY;
 333         ret = TRUE;
 334         break;
 335     case BINARY_DOS:
 336         *lpBinaryType = SCS_DOS_BINARY;
 337         ret = TRUE;
 338         break;
 339     case BINARY_UNIX_EXE:
 340     case BINARY_UNIX_LIB:
 341         ret = FALSE;
 342         break;
 343     }
 344
 345     CloseHandle( hfile );
 346     return ret;
 347 }
 348
 349 /***********************************************************************
 350  *             GetBinaryTypeA                     [KERNEL32.@]
 351  *             GetBinaryType                      [KERNEL32.@]
 352  */
 353 BOOL WINAPI GetBinaryTypeA( LPCSTR lpApplicationName, LPDWORD lpBinaryType )
 354 {
 355     ANSI_STRING app_nameA;
 356     NTSTATUS status;
 357
 358     TRACE("%s\n", debugstr_a(lpApplicationName));
 359
 360     /* Sanity check.
 361      */
 362     if ( lpApplicationName == NULL || lpBinaryType == NULL )
 363         return FALSE;
 364
 365     RtlInitAnsiString(&app_nameA, lpApplicationName);
 366     status = RtlAnsiStringToUnicodeString(&NtCurrentTeb()->StaticUnicodeString,
 367                                           &app_nameA, FALSE);
 368     if (!status)
 369         return GetBinaryTypeW(NtCurrentTeb()->StaticUnicodeString.Buffer, lpBinaryType);
 370
 371     SetLastError(RtlNtStatusToDosError(status));
 372     return FALSE;
 373 }
 374
 375
 376 /***********************************************************************
 377  *              GetModuleHandleA         (KERNEL32.@)
 378  *              GetModuleHandle32        (KERNEL.488)
 379  *
 380  * Get the handle of a dll loaded into the process address space.
 381  *
 382  * PARAMS
 383  *  module [I] Name of the dll
 384  *
 385  * RETURNS
 386  *  Success: A handle to the loaded dll.
 387  *  Failure: A NULL handle. Use GetLastError() to determine the cause.
 388  */
 389 HMODULE WINAPI GetModuleHandleA(LPCSTR module)
 390 {
 391     NTSTATUS            nts;
 392     HMODULE             ret;
 393     UNICODE_STRING      wstr;
 394
 395     if (!module) return NtCurrentTeb()->Peb->ImageBaseAddress;
 396
 397     RtlCreateUnicodeStringFromAsciiz(&wstr, module);
 398     nts = LdrGetDllHandle(0, 0, &wstr, &ret);
 399     RtlFreeUnicodeString( &wstr );
 400     if (nts != STATUS_SUCCESS)
 401     {
 402         ret = 0;
 403         SetLastError( RtlNtStatusToDosError( nts ) );
 404     }
 405     return ret;
 406 }
 407
 408 /***********************************************************************
 409  *              GetModuleHandleW (KERNEL32.@)
 410  *
 411  * Unicode version of GetModuleHandleA.
 412  */
 413 HMODULE WINAPI GetModuleHandleW(LPCWSTR module)
 414 {
 415     NTSTATUS            nts;
 416     HMODULE             ret;
 417     UNICODE_STRING      wstr;
 418
 419     if (!module) return NtCurrentTeb()->Peb->ImageBaseAddress;
 420
 421     RtlInitUnicodeString( &wstr, module );
 422     nts = LdrGetDllHandle( 0, 0, &wstr, &ret);
 423     if (nts != STATUS_SUCCESS)
 424     {
 425         SetLastError( RtlNtStatusToDosError( nts ) );
 426         ret = 0;
 427     }
 428     return ret;
 429 }
 430
 431
 432 /***********************************************************************
 433  *              GetModuleFileNameA      (KERNEL32.@)
 434  *              GetModuleFileName32     (KERNEL.487)
 435  *
 436  * Get the file name of a loaded module from its handle.
 437  *
 438  * RETURNS
 439  *  Success: The length of the file name, excluding the terminating NUL.
 440  *  Failure: 0. Use GetLastError() to determine the cause.
 441  *
 442  * NOTES
 443  *  This function always returns the long path of hModule (as opposed to
 444  *  GetModuleFileName16() which returns short paths when the modules version
 445  *  field is < 4.0).
 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
 454     if (!filenameW)
 455     {
 456         SetLastError( ERROR_NOT_ENOUGH_MEMORY );
 457         return 0;
 458     }
 459     GetModuleFileNameW( hModule, filenameW, size );
 460     WideCharToMultiByte( CP_ACP, 0, filenameW, -1, lpFileName, size, NULL, NULL );
 461     HeapFree( GetProcessHeap(), 0, filenameW );
 462     return strlen( lpFileName );
 463 }
 464
 465 /***********************************************************************
 466  *              GetModuleFileNameW      (KERNEL32.@)
 467  *
 468  * Unicode version of GetModuleFileNameA.
 469  */
 470 DWORD WINAPI GetModuleFileNameW( HMODULE hModule, LPWSTR lpFileName, DWORD size )
 471 {
 472     ULONG magic;
 473
 474     lpFileName[0] = 0;
 475
 476     LdrLockLoaderLock( 0, NULL, &magic );
 477     if (!hModule && !(NtCurrentTeb()->tibflags & TEBF_WIN32))
 478     {
 479         /* 16-bit task - get current NE module name */
 480         NE_MODULE *pModule = NE_GetPtr( GetCurrentTask() );
 481         if (pModule)
 482         {
 483             WCHAR    path[MAX_PATH];
 484
 485             MultiByteToWideChar( CP_ACP, 0, NE_MODULE_NAME(pModule), -1, path, MAX_PATH );
 486             GetLongPathNameW(path, lpFileName, size);
 487         }
 488     }
 489     else
 490     {
 491         LDR_MODULE* pldr;
 492         NTSTATUS    nts;
 493
 494         if (!hModule) hModule = NtCurrentTeb()->Peb->ImageBaseAddress;
 495         nts = LdrFindEntryForAddress( hModule, &pldr );
 496         if (nts == STATUS_SUCCESS) lstrcpynW(lpFileName, pldr->FullDllName.Buffer, size);
 497         else SetLastError( RtlNtStatusToDosError( nts ) );
 498
 499     }
 500     LdrUnlockLoaderLock( 0, magic );
 501
 502     TRACE( "%s\n", debugstr_w(lpFileName) );
 503     return strlenW(lpFileName);
 504 }
 505
 506
 507 /***********************************************************************
 508  *           get_dll_system_path
 509  */
 510 static const WCHAR *get_dll_system_path(void)
 511 {
 512     static WCHAR *path;
 513
 514     if (!path)
 515     {
 516         WCHAR *p, *exe_name;
 517         int len = 3;
 518
 519         exe_name = NtCurrentTeb()->Peb->ProcessParameters->ImagePathName.Buffer;
 520         if (!(p = strrchrW( exe_name, '\\' ))) p = exe_name;
 521         /* include trailing backslash only on drive root */
 522         if (p == exe_name + 2 && exe_name[1] == ':') p++;
 523         len += p - exe_name;
 524         len += GetSystemDirectoryW( NULL, 0 );
 525         len += GetWindowsDirectoryW( NULL, 0 );
 526         path = HeapAlloc( GetProcessHeap(), 0, len * sizeof(WCHAR) );
 527         memcpy( path, exe_name, (p - exe_name) * sizeof(WCHAR) );
 528         p = path + (p - exe_name);
 529         *p++ = ';';
 530         *p++ = '.';
 531         *p++ = ';';
 532         GetSystemDirectoryW( p, path + len - p);
 533         p += strlenW(p);
 534         *p++ = ';';
 535         GetWindowsDirectoryW( p, path + len - p);
 536     }
 537     return path;
 538 }
 539
 540
 541 /******************************************************************
 542  *              get_dll_load_path
 543  *
 544  * Compute the load path to use for a given dll.
 545  * Returned pointer must be freed by caller.
 546  */
 547 static WCHAR *get_dll_load_path( LPCWSTR module )
 548 {
 549     static const WCHAR pathW[] = {'P','A','T','H',0};
 550
 551     const WCHAR *system_path = get_dll_system_path();
 552     const WCHAR *mod_end = NULL;
 553     UNICODE_STRING name, value;
 554     WCHAR *p, *ret;
 555     int len = 0, path_len = 0;
 556
 557     /* adjust length for module name */
 558
 559     if (module)
 560     {
 561         mod_end = module;
 562         if ((p = strrchrW( mod_end, '\\' ))) mod_end = p;
 563         if ((p = strrchrW( mod_end, '/' ))) mod_end = p;
 564         if (mod_end == module + 2 && module[1] == ':') mod_end++;
 565         if (mod_end == module && module[0] && module[1] == ':') mod_end += 2;
 566         len += (mod_end - module);
 567         system_path = strchrW( system_path, ';' );
 568     }
 569     len += strlenW( system_path ) + 2;
 570
 571     /* get the PATH variable */
 572
 573     RtlInitUnicodeString( &name, pathW );
 574     value.Length = 0;
 575     value.MaximumLength = 0;
 576     value.Buffer = NULL;
 577     if (RtlQueryEnvironmentVariable_U( NULL, &name, &value ) == STATUS_BUFFER_TOO_SMALL)
 578         path_len = value.Length;
 579
 580     if (!(ret = HeapAlloc( GetProcessHeap(), 0, path_len + len * sizeof(WCHAR) ))) return NULL;
 581     p = ret;
 582     if (module)
 583     {
 584         memcpy( ret, module, (mod_end - module) * sizeof(WCHAR) );
 585         p += (mod_end - module);
 586     }
 587     strcpyW( p, system_path );
 588     p += strlenW(p);
 589     *p++ = ';';
 590     value.Buffer = p;
 591     value.MaximumLength = path_len;
 592
 593     while (RtlQueryEnvironmentVariable_U( NULL, &name, &value ) == STATUS_BUFFER_TOO_SMALL)
 594     {
 595         WCHAR *new_ptr;
 596
 597         /* grow the buffer and retry */
 598         path_len = value.Length;
 599         if (!(new_ptr = HeapReAlloc( GetProcessHeap(), 0, ret, path_len + len * sizeof(WCHAR) )))
 600         {
 601             HeapFree( GetProcessHeap(), 0, ret );
 602             return NULL;
 603         }
 604         value.Buffer = new_ptr + (value.Buffer - ret);
 605         value.MaximumLength = path_len;
 606         ret = new_ptr;
 607     }
 608     value.Buffer[value.Length / sizeof(WCHAR)] = 0;
 609     return ret;
 610 }
 611
 612
 613 /******************************************************************
 614  *              MODULE_InitLoadPath
 615  *
 616  * Create the initial dll load path.
 617  */
 618 void MODULE_InitLoadPath(void)
 619 {
 620     WCHAR *path = get_dll_load_path( NULL );
 621     RtlInitUnicodeString( &NtCurrentTeb()->Peb->ProcessParameters->DllPath, path );
 622 }
 623
 624
 625 /******************************************************************
 626  *              load_library_as_datafile
 627  */
 628 static BOOL load_library_as_datafile( LPCWSTR name, HMODULE* hmod)
 629 {
 630     static const WCHAR dotDLL[] = {'.','d','l','l',0};
 631
 632     WCHAR filenameW[MAX_PATH];
 633     HANDLE hFile = INVALID_HANDLE_VALUE;
 634     HANDLE mapping;
 635     HMODULE module;
 636
 637     *hmod = 0;
 638
 639     if (SearchPathW( NULL, (LPCWSTR)name, dotDLL, sizeof(filenameW) / sizeof(filenameW[0]),
 640                      filenameW, NULL ))
 641     {
 642         hFile = CreateFileW( filenameW, GENERIC_READ, FILE_SHARE_READ,
 643                              NULL, OPEN_EXISTING, 0, 0 );
 644     }
 645     if (hFile == INVALID_HANDLE_VALUE) return FALSE;
 646
 647     mapping = CreateFileMappingW( hFile, NULL, PAGE_READONLY, 0, 0, NULL );
 648     CloseHandle( hFile );
 649     if (!mapping) return FALSE;
 650
 651     module = MapViewOfFile( mapping, FILE_MAP_READ, 0, 0, 0 );
 652     CloseHandle( mapping );
 653     if (!module) return FALSE;
 654
 655     /* make sure it's a valid PE file */
 656     if (!RtlImageNtHeader(module))
 657     {
 658         UnmapViewOfFile( module );
 659         return FALSE;
 660     }
 661     *hmod = (HMODULE)((char *)module + 1);  /* set low bit of handle to indicate datafile module */
 662     return TRUE;
 663 }
 664
 665
 666 /******************************************************************
 667  *              load_library
 668  *
 669  * Helper for LoadLibraryExA/W.
 670  */
 671 static HMODULE load_library( const UNICODE_STRING *libname, DWORD flags )
 672 {
 673     NTSTATUS nts;
 674     HMODULE hModule;
 675     WCHAR *load_path;
 676
 677     if (flags & LOAD_LIBRARY_AS_DATAFILE)
 678     {
 679         /* The method in load_library_as_datafile allows searching for the
 680          * 'native' libraries only
 681          */
 682         if (load_library_as_datafile( libname->Buffer, &hModule )) return hModule;
 683         flags |= DONT_RESOLVE_DLL_REFERENCES; /* Just in case */
 684         /* Fallback to normal behaviour */
 685     }
 686
 687     load_path = get_dll_load_path( flags & LOAD_WITH_ALTERED_SEARCH_PATH ? libname->Buffer : NULL );
 688     nts = LdrLoadDll( load_path, flags, libname, &hModule );
 689     HeapFree( GetProcessHeap(), 0, load_path );
 690     if (nts != STATUS_SUCCESS)
 691     {
 692         hModule = 0;
 693         SetLastError( RtlNtStatusToDosError( nts ) );
 694     }
 695     return hModule;
 696 }
 697
 698
 699 /******************************************************************
 700  *              LoadLibraryExA          (KERNEL32.@)
 701  *
 702  * Load a dll file into the process address space.
 703  *
 704  * PARAMS
 705  *  libname [I] Name of the file to load
 706  *  hfile   [I] Reserved, must be 0.
 707  *  flags   [I] Flags for loading the dll
 708  *
 709  * RETURNS
 710  *  Success: A handle to the loaded dll.
 711  *  Failure: A NULL handle. Use GetLastError() to determine the cause.
 712  *
 713  * NOTES
 714  * The HFILE parameter is not used and marked reserved in the SDK. I can
 715  * only guess that it should force a file to be mapped, but I rather
 716  * ignore the parameter because it would be extremely difficult to
 717  * integrate this with different types of module representations.
 718  */
 719 HMODULE WINAPI LoadLibraryExA(LPCSTR libname, HANDLE hfile, DWORD flags)
 720 {
 721     UNICODE_STRING      wstr;
 722     HMODULE             hModule;
 723
 724     if (!libname)
 725     {
 726         SetLastError(ERROR_INVALID_PARAMETER);
 727         return 0;
 728     }
 729     RtlCreateUnicodeStringFromAsciiz( &wstr, libname );
 730     hModule = load_library( &wstr, flags );
 731     RtlFreeUnicodeString( &wstr );
 732     return hModule;
 733 }
 734
 735 /***********************************************************************
 736  *           LoadLibraryExW       (KERNEL32.@)
 737  *
 738  * Unicode version of LoadLibraryExA.
 739  */
 740 HMODULE WINAPI LoadLibraryExW(LPCWSTR libnameW, HANDLE hfile, DWORD flags)
 741 {
 742     UNICODE_STRING      wstr;
 743
 744     if (!libnameW)
 745     {
 746         SetLastError(ERROR_INVALID_PARAMETER);
 747         return 0;
 748     }
 749     RtlInitUnicodeString( &wstr, libnameW );
 750     return load_library( &wstr, flags );
 751 }
 752
 753 /***********************************************************************
 754  *           LoadLibraryA         (KERNEL32.@)
 755  *
 756  * Load a dll file into the process address space.
 757  *
 758  * PARAMS
 759  *  libname [I] Name of the file to load
 760  *
 761  * RETURNS
 762  *  Success: A handle to the loaded dll.
 763  *  Failure: A NULL handle. Use GetLastError() to determine the cause.
 764  *
 765  * NOTES
 766  * See LoadLibraryExA().
 767  */
 768 HMODULE WINAPI LoadLibraryA(LPCSTR libname)
 769 {
 770     return LoadLibraryExA(libname, 0, 0);
 771 }
 772
 773 /***********************************************************************
 774  *           LoadLibraryW         (KERNEL32.@)
 775  *
 776  * Unicode version of LoadLibraryA.
 777  */
 778 HMODULE WINAPI LoadLibraryW(LPCWSTR libnameW)
 779 {
 780     return LoadLibraryExW(libnameW, 0, 0);
 781 }
 782
 783 /***********************************************************************
 784  *           FreeLibrary   (KERNEL32.@)
 785  *           FreeLibrary32 (KERNEL.486)
 786  *
 787  * Free a dll loaded into the process address space.
 788  *
 789  * PARAMS
 790  *  hLibModule [I] Handle to the dll returned by LoadLibraryA().
 791  *
 792  * RETURNS
 793  *  Success: TRUE. The dll is removed if it is not still in use.
 794  *  Failure: FALSE. Use GetLastError() to determine the cause.
 795  */
 796 BOOL WINAPI FreeLibrary(HINSTANCE hLibModule)
 797 {
 798     BOOL                retv = FALSE;
 799     NTSTATUS            nts;
 800
 801     if (!hLibModule)
 802     {
 803         SetLastError( ERROR_INVALID_HANDLE );
 804         return FALSE;
 805     }
 806
 807     if ((ULONG_PTR)hLibModule & 1)
 808     {
 809         /* this is a LOAD_LIBRARY_AS_DATAFILE module */
 810         char *ptr = (char *)hLibModule - 1;
 811         UnmapViewOfFile( ptr );
 812         return TRUE;
 813     }
 814
 815     if ((nts = LdrUnloadDll( hLibModule )) == STATUS_SUCCESS) retv = TRUE;
 816     else SetLastError( RtlNtStatusToDosError( nts ) );
 817
 818     return retv;
 819 }
 820
 821 /***********************************************************************
 822  *           GetProcAddress             (KERNEL32.@)
 823  *
 824  * Find the address of an exported symbol in a loaded dll.
 825  *
 826  * PARAMS
 827  *  hModule  [I] Handle to the dll returned by LoadLibraryA().
 828  *  function [I] Name of the symbol, or an integer ordinal number < 16384
 829  *
 830  * RETURNS
 831  *  Success: A pointer to the symbol in the process address space.
 832  *  Failure: NULL. Use GetLastError() to determine the cause.
 833  */
 834 FARPROC WINAPI GetProcAddress( HMODULE hModule, LPCSTR function )
 835 {
 836     NTSTATUS    nts;
 837     FARPROC     fp;
 838
 839     if (HIWORD(function))
 840     {
 841         ANSI_STRING     str;
 842
 843         RtlInitAnsiString( &str, function );
 844         nts = LdrGetProcedureAddress( hModule, &str, 0, (void**)&fp );
 845     }
 846     else
 847         nts = LdrGetProcedureAddress( hModule, NULL, (DWORD)function, (void**)&fp );
 848     if (nts != STATUS_SUCCESS)
 849     {
 850         SetLastError( RtlNtStatusToDosError( nts ) );
 851         fp = NULL;
 852     }
 853     return fp;
 854 }
 855
 856 /***********************************************************************
 857  *           GetProcAddress32                   (KERNEL.453)
 858  *
 859  * Find the address of an exported symbol in a loaded dll.
 860  *
 861  * PARAMS
 862  *  hModule  [I] Handle to the dll returned by LoadLibraryA().
 863  *  function [I] Name of the symbol, or an integer ordinal number < 16384
 864  *
 865  * RETURNS
 866  *  Success: A pointer to the symbol in the process address space.
 867  *  Failure: NULL. Use GetLastError() to determine the cause.
 868  */
 869 FARPROC WINAPI GetProcAddress32_16( HMODULE hModule, LPCSTR function )
 870 {
 871     /* FIXME: we used to disable snoop when returning proc for Win16 subsystem */
 872     return GetProcAddress( hModule, function );
 873 }