Moved a few more functions to the dlls/kernel directory.
[wine] / dlls / ntdll / rtl.c
1 /*
2  * NT basis DLL
3  *
4  * This file contains the Rtl* API functions. These should be implementable.
5  *
6  * Copyright 1996-1998 Marcus Meissner
7  * Copyright 1999      Alex Korobka
8  * Copyright 2003      Thomas Mertes
9  * Crc32 code Copyright 1986 Gary S. Brown (Public domain)
10  *
11  * This library is free software; you can redistribute it and/or
12  * modify it under the terms of the GNU Lesser General Public
13  * License as published by the Free Software Foundation; either
14  * version 2.1 of the License, or (at your option) any later version.
15  *
16  * This library is distributed in the hope that it will be useful,
17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
19  * Lesser General Public License for more details.
20  *
21  * You should have received a copy of the GNU Lesser General Public
22  * License along with this library; if not, write to the Free Software
23  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
24  */
25
26 #include "config.h"
27 #include "wine/port.h"
28
29 #include <stdlib.h>
30 #include <stdarg.h>
31 #include <stdio.h>
32 #include <string.h>
33 #include "windef.h"
34 #include "winbase.h"
35 #include "winerror.h"
36 #include "winreg.h"
37 #include "winternl.h"
38 #include "wine/unicode.h"
39 #include "wine/debug.h"
40 #include "ntdll_misc.h"
41
42 WINE_DEFAULT_DEBUG_CHANNEL(ntdll);
43
44 static CRITICAL_SECTION peb_lock;
45 static CRITICAL_SECTION_DEBUG critsect_debug =
46 {
47     0, 0, &peb_lock,
48     { &critsect_debug.ProcessLocksList, &critsect_debug.ProcessLocksList },
49       0, 0, { 0, (DWORD)(__FILE__ ": peb_lock") }
50 };
51 static CRITICAL_SECTION peb_lock = { &critsect_debug, -1, 0, 0, 0, 0 };
52
53 /* CRC polynomial 0xedb88320 */
54 static const DWORD CRC_table[256] =
55 {
56     0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f,
57     0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
58     0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2,
59     0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
60     0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
61     0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
62     0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c,
63     0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
64     0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423,
65     0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
66     0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106,
67     0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
68     0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d,
69     0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
70     0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
71     0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
72     0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7,
73     0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
74     0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa,
75     0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
76     0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81,
77     0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
78     0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84,
79     0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
80     0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
81     0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
82     0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e,
83     0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
84     0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55,
85     0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
86     0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28,
87     0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
88     0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f,
89     0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
90     0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
91     0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
92     0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69,
93     0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
94     0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc,
95     0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
96     0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693,
97     0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
98     0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
99 };
100
101 /*
102  *      resource functions
103  */
104
105 /***********************************************************************
106  *           RtlInitializeResource      (NTDLL.@)
107  *
108  * xxxResource() functions implement multiple-reader-single-writer lock.
109  * The code is based on information published in WDJ January 1999 issue.
110  */
111 void WINAPI RtlInitializeResource(LPRTL_RWLOCK rwl)
112 {
113     if( rwl )
114     {
115         rwl->iNumberActive = 0;
116         rwl->uExclusiveWaiters = 0;
117         rwl->uSharedWaiters = 0;
118         rwl->hOwningThreadId = 0;
119         rwl->dwTimeoutBoost = 0; /* no info on this one, default value is 0 */
120         RtlInitializeCriticalSection( &rwl->rtlCS );
121         NtCreateSemaphore( &rwl->hExclusiveReleaseSemaphore, 0, NULL, 0, 65535 );
122         NtCreateSemaphore( &rwl->hSharedReleaseSemaphore, 0, NULL, 0, 65535 );
123     }
124 }
125
126
127 /***********************************************************************
128  *           RtlDeleteResource          (NTDLL.@)
129  */
130 void WINAPI RtlDeleteResource(LPRTL_RWLOCK rwl)
131 {
132     if( rwl )
133     {
134         RtlEnterCriticalSection( &rwl->rtlCS );
135         if( rwl->iNumberActive || rwl->uExclusiveWaiters || rwl->uSharedWaiters )
136             MESSAGE("Deleting active MRSW lock (%p), expect failure\n", rwl );
137         rwl->hOwningThreadId = 0;
138         rwl->uExclusiveWaiters = rwl->uSharedWaiters = 0;
139         rwl->iNumberActive = 0;
140         NtClose( rwl->hExclusiveReleaseSemaphore );
141         NtClose( rwl->hSharedReleaseSemaphore );
142         RtlLeaveCriticalSection( &rwl->rtlCS );
143         RtlDeleteCriticalSection( &rwl->rtlCS );
144     }
145 }
146
147
148 /***********************************************************************
149  *          RtlAcquireResourceExclusive (NTDLL.@)
150  */
151 BYTE WINAPI RtlAcquireResourceExclusive(LPRTL_RWLOCK rwl, BYTE fWait)
152 {
153     BYTE retVal = 0;
154     if( !rwl ) return 0;
155
156 start:
157     RtlEnterCriticalSection( &rwl->rtlCS );
158     if( rwl->iNumberActive == 0 ) /* lock is free */
159     {
160         rwl->iNumberActive = -1;
161         retVal = 1;
162     }
163     else if( rwl->iNumberActive < 0 ) /* exclusive lock in progress */
164     {
165          if( rwl->hOwningThreadId == (HANDLE)GetCurrentThreadId() )
166          {
167              retVal = 1;
168              rwl->iNumberActive--;
169              goto done;
170          }
171 wait:
172          if( fWait )
173          {
174              rwl->uExclusiveWaiters++;
175
176              RtlLeaveCriticalSection( &rwl->rtlCS );
177              if( NtWaitForSingleObject( rwl->hExclusiveReleaseSemaphore, FALSE, NULL ) == WAIT_FAILED )
178                  goto done;
179              goto start; /* restart the acquisition to avoid deadlocks */
180          }
181     }
182     else  /* one or more shared locks are in progress */
183          if( fWait )
184              goto wait;
185
186     if( retVal == 1 )
187         rwl->hOwningThreadId = (HANDLE)GetCurrentThreadId();
188 done:
189     RtlLeaveCriticalSection( &rwl->rtlCS );
190     return retVal;
191 }
192
193 /***********************************************************************
194  *          RtlAcquireResourceShared    (NTDLL.@)
195  */
196 BYTE WINAPI RtlAcquireResourceShared(LPRTL_RWLOCK rwl, BYTE fWait)
197 {
198     DWORD dwWait = WAIT_FAILED;
199     BYTE retVal = 0;
200     if( !rwl ) return 0;
201
202 start:
203     RtlEnterCriticalSection( &rwl->rtlCS );
204     if( rwl->iNumberActive < 0 )
205     {
206         if( rwl->hOwningThreadId == (HANDLE)GetCurrentThreadId() )
207         {
208             rwl->iNumberActive--;
209             retVal = 1;
210             goto done;
211         }
212
213         if( fWait )
214         {
215             rwl->uSharedWaiters++;
216             RtlLeaveCriticalSection( &rwl->rtlCS );
217             if( (dwWait = NtWaitForSingleObject( rwl->hSharedReleaseSemaphore, FALSE, NULL )) == WAIT_FAILED )
218                 goto done;
219             goto start;
220         }
221     }
222     else
223     {
224         if( dwWait != WAIT_OBJECT_0 ) /* otherwise RtlReleaseResource() has already done it */
225             rwl->iNumberActive++;
226         retVal = 1;
227     }
228 done:
229     RtlLeaveCriticalSection( &rwl->rtlCS );
230     return retVal;
231 }
232
233
234 /***********************************************************************
235  *           RtlReleaseResource         (NTDLL.@)
236  */
237 void WINAPI RtlReleaseResource(LPRTL_RWLOCK rwl)
238 {
239     RtlEnterCriticalSection( &rwl->rtlCS );
240
241     if( rwl->iNumberActive > 0 ) /* have one or more readers */
242     {
243         if( --rwl->iNumberActive == 0 )
244         {
245             if( rwl->uExclusiveWaiters )
246             {
247 wake_exclusive:
248                 rwl->uExclusiveWaiters--;
249                 NtReleaseSemaphore( rwl->hExclusiveReleaseSemaphore, 1, NULL );
250             }
251         }
252     }
253     else
254     if( rwl->iNumberActive < 0 ) /* have a writer, possibly recursive */
255     {
256         if( ++rwl->iNumberActive == 0 )
257         {
258             rwl->hOwningThreadId = 0;
259             if( rwl->uExclusiveWaiters )
260                 goto wake_exclusive;
261             else
262                 if( rwl->uSharedWaiters )
263                 {
264                     UINT n = rwl->uSharedWaiters;
265                     rwl->iNumberActive = rwl->uSharedWaiters; /* prevent new writers from joining until
266                                                                * all queued readers have done their thing */
267                     rwl->uSharedWaiters = 0;
268                     NtReleaseSemaphore( rwl->hSharedReleaseSemaphore, n, NULL );
269                 }
270         }
271     }
272     RtlLeaveCriticalSection( &rwl->rtlCS );
273 }
274
275
276 /***********************************************************************
277  *           RtlDumpResource            (NTDLL.@)
278  */
279 void WINAPI RtlDumpResource(LPRTL_RWLOCK rwl)
280 {
281     if( rwl )
282     {
283         MESSAGE("RtlDumpResource(%p):\n\tactive count = %i\n\twaiting readers = %i\n\twaiting writers = %i\n",
284                 rwl, rwl->iNumberActive, rwl->uSharedWaiters, rwl->uExclusiveWaiters );
285         if( rwl->iNumberActive )
286             MESSAGE("\towner thread = %p\n", rwl->hOwningThreadId );
287     }
288 }
289
290 /*
291  *      misc functions
292  */
293
294 /******************************************************************************
295  *      DbgPrint        [NTDLL.@]
296  */
297 void WINAPIV DbgPrint(LPCSTR fmt, ...)
298 {
299        char buf[512];
300        va_list args;
301
302        va_start(args, fmt);
303        vsprintf(buf,fmt, args);
304        va_end(args);
305
306         MESSAGE("DbgPrint says: %s",buf);
307         /* hmm, raise exception? */
308 }
309
310 /******************************************************************************
311  *  RtlAcquirePebLock           [NTDLL.@]
312  */
313 VOID WINAPI RtlAcquirePebLock(void)
314 {
315     RtlEnterCriticalSection( &peb_lock );
316 }
317
318 /******************************************************************************
319  *  RtlReleasePebLock           [NTDLL.@]
320  */
321 VOID WINAPI RtlReleasePebLock(void)
322 {
323     RtlLeaveCriticalSection( &peb_lock );
324 }
325
326 /******************************************************************************
327  *  RtlNewSecurityObject                [NTDLL.@]
328  */
329 DWORD WINAPI RtlNewSecurityObject(DWORD x1,DWORD x2,DWORD x3,DWORD x4,DWORD x5,DWORD x6) {
330         FIXME("(0x%08lx,0x%08lx,0x%08lx,0x%08lx,0x%08lx,0x%08lx),stub!\n",x1,x2,x3,x4,x5,x6);
331         return 0;
332 }
333
334 /******************************************************************************
335  *  RtlDeleteSecurityObject             [NTDLL.@]
336  */
337 DWORD WINAPI RtlDeleteSecurityObject(DWORD x1) {
338         FIXME("(0x%08lx),stub!\n",x1);
339         return 0;
340 }
341
342 /**************************************************************************
343  *                 RtlGetNtProductType                  [NTDLL.@]
344  */
345 BOOLEAN WINAPI RtlGetNtProductType(LPDWORD type)
346 {
347     FIXME("(%p): stub\n", type);
348     *type=3; /* dunno. 1 for client, 3 for server? */
349     return 1;
350 }
351
352 /**************************************************************************
353  *                 _chkstk                              [NTDLL.@]
354  *
355  * Glorified "enter xxxx".
356  */
357 void WINAPI NTDLL_chkstk( CONTEXT86 *context )
358 {
359     context->Esp -= context->Eax;
360 }
361
362 /**************************************************************************
363  *                 _alloca_probe                        [NTDLL.@]
364  *
365  * Glorified "enter xxxx".
366  */
367 void WINAPI NTDLL_alloca_probe( CONTEXT86 *context )
368 {
369     context->Esp -= context->Eax;
370 }
371
372 /******************************************************************************
373  *  RtlInitializeGenericTable           [NTDLL.@]
374  */
375 PVOID WINAPI RtlInitializeGenericTable(PVOID pTable, PVOID arg2, PVOID arg3, PVOID arg4, PVOID arg5)
376 {
377   FIXME("(%p,%p,%p,%p,%p) stub!\n", pTable, arg2, arg3, arg4, arg5);
378   return NULL;
379 }
380
381 /******************************************************************************
382  *  RtlMoveMemory   [NTDLL.@]
383  *
384  * Move a block of memory that may overlap.
385  *
386  * PARAMS
387  *  Destination [O] End destination for block
388  *  Source      [O] Where to start copying from
389  *  Length      [I] Number of bytes to copy
390  *
391  * RETURNS
392  *  Nothing.
393  */
394 #undef RtlMoveMemory
395 VOID WINAPI RtlMoveMemory( VOID *Destination, CONST VOID *Source, SIZE_T Length )
396 {
397     memmove(Destination, Source, Length);
398 }
399
400 /******************************************************************************
401  *  RtlFillMemory   [NTDLL.@]
402  *
403  * Set a block of memory with a value.
404  *
405  * PARAMS
406  *  Destination [O] Block to fill
407  *  Length      [I] Number of bytes to fill
408  *  Fill        [I] Value to set
409  *
410  * RETURNS
411  *  Nothing.
412  */
413 #undef RtlFillMemory
414 VOID WINAPI RtlFillMemory( VOID *Destination, SIZE_T Length, BYTE Fill )
415 {
416     memset(Destination, Fill, Length);
417 }
418
419 /******************************************************************************
420  *  RtlZeroMemory   [NTDLL.@]
421  *
422  * Set a block of memory with 0's.
423  *
424  * PARAMS
425  *  Destination [O] Block to fill
426  *  Length      [I] Number of bytes to fill
427  *
428  * RETURNS
429  *  Nothing.
430  */
431 #undef RtlZeroMemory
432 VOID WINAPI RtlZeroMemory( VOID *Destination, SIZE_T Length )
433 {
434     memset(Destination, 0, Length);
435 }
436
437 /******************************************************************************
438  *  RtlCompareMemory   [NTDLL.@]
439  *
440  * Compare one block of memory with another
441  *
442  * PARAMS
443  *  Source1 [I] Source block
444  *  Source2 [I] Block to compare to Source1
445  *  Length  [I] Number of bytes to fill
446  *
447  * RETURNS
448  *  The length of the first byte at which Source1 and Source2 differ, or Length
449  *  if they are the same.
450  */
451 SIZE_T WINAPI RtlCompareMemory( const VOID *Source1, const VOID *Source2, SIZE_T Length)
452 {
453     SIZE_T i;
454     for(i=0; (i<Length) && (((LPBYTE)Source1)[i]==((LPBYTE)Source2)[i]); i++);
455     return i;
456 }
457
458 /******************************************************************************
459  *  RtlCompareMemoryUlong   [NTDLL.@]
460  *
461  * Compare a block of memory with a value, a ULONG at a time
462  *
463  * PARAMS
464  *  Source1 [I] Source block. This must be ULONG aligned
465  *  Length  [I] Number of bytes to compare. This should be a multiple of 4
466  *  dwVal   [I] Value to compare to
467  *
468  * RETURNS
469  *  The byte position of the first byte at which Source1 is not dwVal.
470  */
471 SIZE_T WINAPI RtlCompareMemoryUlong(const ULONG *Source1, SIZE_T Length, ULONG dwVal)
472 {
473     SIZE_T i;
474     for(i = 0; i < Length/sizeof(ULONG) && Source1[i] == dwVal; i++);
475     return i * sizeof(ULONG);
476 }
477
478 /******************************************************************************
479  *  RtlAssert                           [NTDLL.@]
480  *
481  * Fail a debug assertion.
482  *
483  * RETURNS
484  *  Nothing. This call does not return control to its caller.
485  *
486  * NOTES
487  * Not implemented in non-debug versions.
488  */
489 void WINAPI RtlAssert(LPVOID x1,LPVOID x2,DWORD x3, DWORD x4)
490 {
491         FIXME("(%p,%p,0x%08lx,0x%08lx),stub\n",x1,x2,x3,x4);
492 }
493
494 /*************************************************************************
495  * RtlFillMemoryUlong   [NTDLL.@]
496  *
497  * Fill memory with a 32 bit (dword) value.
498  *
499  * PARAMS
500  *  lpDest  [I] Bitmap pointer
501  *  ulCount [I] Number of dwords to write
502  *  ulValue [I] Value to fill with
503  *
504  * RETURNS
505  *  Nothing.
506  */
507 VOID WINAPI RtlFillMemoryUlong(ULONG* lpDest, ULONG ulCount, ULONG ulValue)
508 {
509   TRACE("(%p,%ld,%ld)\n", lpDest, ulCount, ulValue);
510
511   ulCount /= sizeof(ULONG);
512   while(ulCount--)
513     *lpDest++ = ulValue;
514 }
515
516 /*********************************************************************
517  *                  RtlComputeCrc32   [NTDLL.@]
518  *
519  * Calculate the CRC32 checksum of a block of bytes
520  *
521  * PARAMS
522  *  dwInitial [I] Initial CRC value
523  *  pData     [I] Data block
524  *  iLen      [I] Length of the byte block
525  *
526  * RETURNS
527  *  The cumulative CRC32 of dwInitial and iLen bytes of the pData block.
528  */
529 DWORD WINAPI RtlComputeCrc32(DWORD dwInitial, PBYTE pData, INT iLen)
530 {
531   DWORD crc = ~dwInitial;
532
533   TRACE("(%ld,%p,%d)\n", dwInitial, pData, iLen);
534
535   while (iLen > 0)
536   {
537     crc = CRC_table[(crc ^ *pData) & 0xff] ^ (crc >> 8);
538     pData++;
539     iLen--;
540   }
541   return ~crc;
542 }
543
544
545 /*************************************************************************
546  * RtlUlonglongByteSwap    [NTDLL.@]
547  *
548  * Swap the bytes of an unsigned long long value.
549  *
550  * PARAMS
551  *  i [I] Value to swap bytes of
552  *
553  * RETURNS
554  *  The value with its bytes swapped.
555  */
556 ULONGLONG __cdecl RtlUlonglongByteSwap(ULONGLONG i)
557 {
558   return ((ULONGLONG)RtlUlongByteSwap(i) << 32) | RtlUlongByteSwap(i>>32);
559 }
560
561 /*************************************************************************
562  * RtlUlongByteSwap    [NTDLL.@]
563  *
564  * Swap the bytes of an unsigned int value.
565  *
566  * NOTES
567  *  ix86 version takes argument in %ecx. Other systems use the inline version.
568  */
569 #ifdef __i386__
570 __ASM_GLOBAL_FUNC(NTDLL_RtlUlongByteSwap,
571                   "movl %ecx,%eax\n\t"
572                   "bswap %eax\n\t"
573                   "ret");
574 #endif
575
576 /*************************************************************************
577  * RtlUshortByteSwap    [NTDLL.@]
578  *
579  * Swap the bytes of an unsigned short value.
580  *
581  * NOTES
582  *  i386 version takes argument in %cx. Other systems use the inline version.
583  */
584 #ifdef __i386__
585 __ASM_GLOBAL_FUNC(NTDLL_RtlUshortByteSwap,
586                   "movb %ch,%al\n\t"
587                   "movb %cl,%ah\n\t"
588                   "ret");
589 #endif
590
591
592 /*************************************************************************
593  * RtlUniform   [NTDLL.@]
594  *
595  * Generates an uniform random number
596  *
597  * PARAMS
598  *  seed [O] The seed of the Random function
599  *
600  * RETURNS
601  *  It returns a random number uniformly distributed over [0..MAXLONG-1].
602  *
603  * NOTES
604  *  Generates an uniform random number using D.H. Lehmer's 1948 algorithm.
605  *  In our case the algorithm is:
606  *
607  *  result = (*seed * 0x7fffffed + 0x7fffffc3) % MAXLONG;
608  *
609  *  *seed = result;
610  *
611  * DIFFERENCES
612  *  The native documentation states that the random number is
613  *  uniformly distributed over [0..MAXLONG]. In reality the native
614  *  function and our function return a random number uniformly
615  *  distributed over [0..MAXLONG-1].
616  */
617 ULONG WINAPI RtlUniform (PULONG seed)
618 {
619     ULONG result;
620
621    /*
622     * Instead of the algorithm stated above, we use the algorithm
623     * below, which is totally equivalent (see the tests), but does
624     * not use a division and therefore is faster.
625     */
626     result = *seed * 0xffffffed + 0x7fffffc3;
627     if (result == 0xffffffff || result == 0x7ffffffe) {
628         result = (result + 2) & MAXLONG;
629     } else if (result == 0x7fffffff) {
630         result = 0;
631     } else if ((result & 0x80000000) == 0) {
632         result = result + (~result & 1);
633     } else {
634         result = (result + (result & 1)) & MAXLONG;
635     } /* if */
636     *seed = result;
637     return result;
638 }
639
640
641 /*************************************************************************
642  * RtlRandom   [NTDLL.@]
643  *
644  * Generates a random number
645  *
646  * PARAMS
647  *  seed [O] The seed of the Random function
648  *
649  * RETURNS
650  *  It returns a random number distributed over [0..MAXLONG-1].
651  */
652 ULONG WINAPI RtlRandom (PULONG seed)
653 {
654     static ULONG saved_value[128] =
655     { /*   0 */ 0x4c8bc0aa, 0x4c022957, 0x2232827a, 0x2f1e7626, 0x7f8bdafb, 0x5c37d02a, 0x0ab48f72, 0x2f0c4ffa,
656       /*   8 */ 0x290e1954, 0x6b635f23, 0x5d3885c0, 0x74b49ff8, 0x5155fa54, 0x6214ad3f, 0x111e9c29, 0x242a3a09,
657       /*  16 */ 0x75932ae1, 0x40ac432e, 0x54f7ba7a, 0x585ccbd5, 0x6df5c727, 0x0374dad1, 0x7112b3f1, 0x735fc311,
658       /*  24 */ 0x404331a9, 0x74d97781, 0x64495118, 0x323e04be, 0x5974b425, 0x4862e393, 0x62389c1d, 0x28a68b82,
659       /*  32 */ 0x0f95da37, 0x7a50bbc6, 0x09b0091c, 0x22cdb7b4, 0x4faaed26, 0x66417ccd, 0x189e4bfa, 0x1ce4e8dd,
660       /*  40 */ 0x5274c742, 0x3bdcf4dc, 0x2d94e907, 0x32eac016, 0x26d33ca3, 0x60415a8a, 0x31f57880, 0x68c8aa52,
661       /*  48 */ 0x23eb16da, 0x6204f4a1, 0x373927c1, 0x0d24eb7c, 0x06dd7379, 0x2b3be507, 0x0f9c55b1, 0x2c7925eb,
662       /*  56 */ 0x36d67c9a, 0x42f831d9, 0x5e3961cb, 0x65d637a8, 0x24bb3820, 0x4d08e33d, 0x2188754f, 0x147e409e,
663       /*  64 */ 0x6a9620a0, 0x62e26657, 0x7bd8ce81, 0x11da0abb, 0x5f9e7b50, 0x23e444b6, 0x25920c78, 0x5fc894f0,
664       /*  72 */ 0x5e338cbb, 0x404237fd, 0x1d60f80f, 0x320a1743, 0x76013d2b, 0x070294ee, 0x695e243b, 0x56b177fd,
665       /*  80 */ 0x752492e1, 0x6decd52f, 0x125f5219, 0x139d2e78, 0x1898d11e, 0x2f7ee785, 0x4db405d8, 0x1a028a35,
666       /*  88 */ 0x63f6f323, 0x1f6d0078, 0x307cfd67, 0x3f32a78a, 0x6980796c, 0x462b3d83, 0x34b639f2, 0x53fce379,
667       /*  96 */ 0x74ba50f4, 0x1abc2c4b, 0x5eeaeb8d, 0x335a7a0d, 0x3973dd20, 0x0462d66b, 0x159813ff, 0x1e4643fd,
668       /* 104 */ 0x06bc5c62, 0x3115e3fc, 0x09101613, 0x47af2515, 0x4f11ec54, 0x78b99911, 0x3db8dd44, 0x1ec10b9b,
669       /* 112 */ 0x5b5506ca, 0x773ce092, 0x567be81a, 0x5475b975, 0x7a2cde1a, 0x494536f5, 0x34737bb4, 0x76d9750b,
670       /* 120 */ 0x2a1f6232, 0x2e49644d, 0x7dddcbe7, 0x500cebdb, 0x619dab9e, 0x48c626fe, 0x1cda3193, 0x52dabe9d };
671     ULONG rand;
672     int pos;
673     ULONG result;
674
675     rand = (*seed * 0x7fffffed + 0x7fffffc3) % 0x7fffffff;
676     *seed = (rand * 0x7fffffed + 0x7fffffc3) % 0x7fffffff;
677     pos = *seed & 0x7f;
678     result = saved_value[pos];
679     saved_value[pos] = rand;
680     return(result);
681 }
682
683
684 /*************************************************************************
685  * RtlAreAllAccessesGranted   [NTDLL.@]
686  *
687  * Check if all desired accesses are granted
688  *
689  * RETURNS
690  *  TRUE: All desired accesses are granted
691  *  FALSE: Otherwise
692  */
693 BOOLEAN WINAPI RtlAreAllAccessesGranted(
694     ACCESS_MASK GrantedAccess,
695     ACCESS_MASK DesiredAccess)
696 {
697     return (GrantedAccess & DesiredAccess) == DesiredAccess;
698 }
699
700
701 /*************************************************************************
702  * RtlAreAnyAccessesGranted   [NTDLL.@]
703  *
704  * Check if at least one of the desired accesses is granted
705  *
706  * RETURNS
707  *  TRUE: At least one of the desired accesses is granted
708  *  FALSE: Otherwise
709  */
710 BOOLEAN WINAPI RtlAreAnyAccessesGranted(
711     ACCESS_MASK GrantedAccess,
712     ACCESS_MASK DesiredAccess)
713 {
714     return (GrantedAccess & DesiredAccess) != 0;
715 }
716
717
718 /*************************************************************************
719  * RtlMapGenericMask   [NTDLL.@]
720  *
721  * Determine the nongeneric access rights specified by an access mask
722  *
723  * RETURNS
724  *  Nothing.
725  */
726 void WINAPI RtlMapGenericMask(
727     PACCESS_MASK AccessMask,
728     const GENERIC_MAPPING *GenericMapping)
729 {
730     if (*AccessMask & GENERIC_READ) {
731         *AccessMask |= GenericMapping->GenericRead;
732     } /* if */
733
734     if (*AccessMask & GENERIC_WRITE) {
735         *AccessMask |= GenericMapping->GenericWrite;
736     } /* if */
737
738     if (*AccessMask & GENERIC_EXECUTE) {
739         *AccessMask |= GenericMapping->GenericExecute;
740     } /* if */
741
742     if (*AccessMask & GENERIC_ALL) {
743         *AccessMask |= GenericMapping->GenericAll;
744     } /* if */
745
746     *AccessMask &= 0x0FFFFFFF;
747 }
748
749
750 /*************************************************************************
751  * RtlCopyLuid   [NTDLL.@]
752  *
753  * Copies the LuidSrc to LuidDest.
754  *
755  * RETURNS
756  *  Nothing.
757  */
758 void WINAPI RtlCopyLuid (PLUID LuidDest, const LUID *LuidSrc)
759 {
760     *LuidDest = *LuidSrc;
761 }
762
763
764 /*************************************************************************
765  * RtlEqualLuid   [NTDLL.@]
766  *
767  * Compares two local unique ID's.
768  *
769  * RETURNS
770  *  TRUE: The two LUID's are equal.
771  *  FALSE: Otherwise
772  */
773 BOOLEAN WINAPI RtlEqualLuid (const LUID *Luid1, const LUID *Luid2)
774 {
775   return (Luid1->LowPart ==  Luid2->LowPart && Luid1->HighPart == Luid2->HighPart);
776 }
777
778
779 /*************************************************************************
780  * RtlCopyLuidAndAttributesArray   [NTDLL.@]
781  *
782  * Copies an array of LUID's and attributes.
783  *
784  * RETURNS
785  *  Nothing.
786  */
787 void WINAPI RtlCopyLuidAndAttributesArray(
788     ULONG Count,
789     const LUID_AND_ATTRIBUTES *Src,
790     PLUID_AND_ATTRIBUTES Dest)
791 {
792     ULONG i;
793
794     for (i = 0; i < Count; i++) Dest[i] = Src[i];
795 }