With >256 colours, there is no need to realize a palette, so skip it
[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 <stdio.h>
31 #include <string.h>
32 #include "windef.h"
33 #include "winerror.h"
34 #include "winternl.h"
35 #include "winreg.h"
36 #include "wine/unicode.h"
37 #include "wine/debug.h"
38 #include "ntdll_misc.h"
39
40 WINE_DEFAULT_DEBUG_CHANNEL(ntdll);
41
42
43 static RTL_CRITICAL_SECTION peb_lock = CRITICAL_SECTION_INIT("peb_lock");
44
45 /* CRC polynomial 0xedb88320 */
46 static const DWORD CRC_table[256] =
47 {
48     0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f,
49     0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
50     0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2,
51     0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
52     0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
53     0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
54     0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c,
55     0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
56     0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423,
57     0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
58     0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106,
59     0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
60     0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d,
61     0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
62     0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
63     0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
64     0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7,
65     0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
66     0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa,
67     0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
68     0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81,
69     0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
70     0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84,
71     0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
72     0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
73     0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
74     0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e,
75     0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
76     0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55,
77     0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
78     0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28,
79     0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
80     0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f,
81     0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
82     0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
83     0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
84     0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69,
85     0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
86     0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc,
87     0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
88     0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693,
89     0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
90     0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
91 };
92
93 /*
94  *      resource functions
95  */
96
97 /***********************************************************************
98  *           RtlInitializeResource      (NTDLL.@)
99  *
100  * xxxResource() functions implement multiple-reader-single-writer lock.
101  * The code is based on information published in WDJ January 1999 issue.
102  */
103 void WINAPI RtlInitializeResource(LPRTL_RWLOCK rwl)
104 {
105     if( rwl )
106     {
107         rwl->iNumberActive = 0;
108         rwl->uExclusiveWaiters = 0;
109         rwl->uSharedWaiters = 0;
110         rwl->hOwningThreadId = 0;
111         rwl->dwTimeoutBoost = 0; /* no info on this one, default value is 0 */
112         RtlInitializeCriticalSection( &rwl->rtlCS );
113         NtCreateSemaphore( &rwl->hExclusiveReleaseSemaphore, 0, NULL, 0, 65535 );
114         NtCreateSemaphore( &rwl->hSharedReleaseSemaphore, 0, NULL, 0, 65535 );
115     }
116 }
117
118
119 /***********************************************************************
120  *           RtlDeleteResource          (NTDLL.@)
121  */
122 void WINAPI RtlDeleteResource(LPRTL_RWLOCK rwl)
123 {
124     if( rwl )
125     {
126         RtlEnterCriticalSection( &rwl->rtlCS );
127         if( rwl->iNumberActive || rwl->uExclusiveWaiters || rwl->uSharedWaiters )
128             MESSAGE("Deleting active MRSW lock (%p), expect failure\n", rwl );
129         rwl->hOwningThreadId = 0;
130         rwl->uExclusiveWaiters = rwl->uSharedWaiters = 0;
131         rwl->iNumberActive = 0;
132         NtClose( rwl->hExclusiveReleaseSemaphore );
133         NtClose( rwl->hSharedReleaseSemaphore );
134         RtlLeaveCriticalSection( &rwl->rtlCS );
135         RtlDeleteCriticalSection( &rwl->rtlCS );
136     }
137 }
138
139
140 /***********************************************************************
141  *          RtlAcquireResourceExclusive (NTDLL.@)
142  */
143 BYTE WINAPI RtlAcquireResourceExclusive(LPRTL_RWLOCK rwl, BYTE fWait)
144 {
145     BYTE retVal = 0;
146     if( !rwl ) return 0;
147
148 start:
149     RtlEnterCriticalSection( &rwl->rtlCS );
150     if( rwl->iNumberActive == 0 ) /* lock is free */
151     {
152         rwl->iNumberActive = -1;
153         retVal = 1;
154     }
155     else if( rwl->iNumberActive < 0 ) /* exclusive lock in progress */
156     {
157          if( rwl->hOwningThreadId == (HANDLE)GetCurrentThreadId() )
158          {
159              retVal = 1;
160              rwl->iNumberActive--;
161              goto done;
162          }
163 wait:
164          if( fWait )
165          {
166              rwl->uExclusiveWaiters++;
167
168              RtlLeaveCriticalSection( &rwl->rtlCS );
169              if( NtWaitForSingleObject( rwl->hExclusiveReleaseSemaphore, FALSE, NULL ) == WAIT_FAILED )
170                  goto done;
171              goto start; /* restart the acquisition to avoid deadlocks */
172          }
173     }
174     else  /* one or more shared locks are in progress */
175          if( fWait )
176              goto wait;
177
178     if( retVal == 1 )
179         rwl->hOwningThreadId = (HANDLE)GetCurrentThreadId();
180 done:
181     RtlLeaveCriticalSection( &rwl->rtlCS );
182     return retVal;
183 }
184
185 /***********************************************************************
186  *          RtlAcquireResourceShared    (NTDLL.@)
187  */
188 BYTE WINAPI RtlAcquireResourceShared(LPRTL_RWLOCK rwl, BYTE fWait)
189 {
190     DWORD dwWait = WAIT_FAILED;
191     BYTE retVal = 0;
192     if( !rwl ) return 0;
193
194 start:
195     RtlEnterCriticalSection( &rwl->rtlCS );
196     if( rwl->iNumberActive < 0 )
197     {
198         if( rwl->hOwningThreadId == (HANDLE)GetCurrentThreadId() )
199         {
200             rwl->iNumberActive--;
201             retVal = 1;
202             goto done;
203         }
204
205         if( fWait )
206         {
207             rwl->uSharedWaiters++;
208             RtlLeaveCriticalSection( &rwl->rtlCS );
209             if( (dwWait = NtWaitForSingleObject( rwl->hSharedReleaseSemaphore, FALSE, NULL )) == WAIT_FAILED )
210                 goto done;
211             goto start;
212         }
213     }
214     else
215     {
216         if( dwWait != WAIT_OBJECT_0 ) /* otherwise RtlReleaseResource() has already done it */
217             rwl->iNumberActive++;
218         retVal = 1;
219     }
220 done:
221     RtlLeaveCriticalSection( &rwl->rtlCS );
222     return retVal;
223 }
224
225
226 /***********************************************************************
227  *           RtlReleaseResource         (NTDLL.@)
228  */
229 void WINAPI RtlReleaseResource(LPRTL_RWLOCK rwl)
230 {
231     RtlEnterCriticalSection( &rwl->rtlCS );
232
233     if( rwl->iNumberActive > 0 ) /* have one or more readers */
234     {
235         if( --rwl->iNumberActive == 0 )
236         {
237             if( rwl->uExclusiveWaiters )
238             {
239 wake_exclusive:
240                 rwl->uExclusiveWaiters--;
241                 NtReleaseSemaphore( rwl->hExclusiveReleaseSemaphore, 1, NULL );
242             }
243         }
244     }
245     else
246     if( rwl->iNumberActive < 0 ) /* have a writer, possibly recursive */
247     {
248         if( ++rwl->iNumberActive == 0 )
249         {
250             rwl->hOwningThreadId = 0;
251             if( rwl->uExclusiveWaiters )
252                 goto wake_exclusive;
253             else
254                 if( rwl->uSharedWaiters )
255                 {
256                     UINT n = rwl->uSharedWaiters;
257                     rwl->iNumberActive = rwl->uSharedWaiters; /* prevent new writers from joining until
258                                                                * all queued readers have done their thing */
259                     rwl->uSharedWaiters = 0;
260                     NtReleaseSemaphore( rwl->hSharedReleaseSemaphore, n, NULL );
261                 }
262         }
263     }
264     RtlLeaveCriticalSection( &rwl->rtlCS );
265 }
266
267
268 /***********************************************************************
269  *           RtlDumpResource            (NTDLL.@)
270  */
271 void WINAPI RtlDumpResource(LPRTL_RWLOCK rwl)
272 {
273     if( rwl )
274     {
275         MESSAGE("RtlDumpResource(%p):\n\tactive count = %i\n\twaiting readers = %i\n\twaiting writers = %i\n",
276                 rwl, rwl->iNumberActive, rwl->uSharedWaiters, rwl->uExclusiveWaiters );
277         if( rwl->iNumberActive )
278             MESSAGE("\towner thread = %p\n", rwl->hOwningThreadId );
279     }
280 }
281
282 /*
283  *      misc functions
284  */
285
286 /******************************************************************************
287  *      DbgPrint        [NTDLL.@]
288  */
289 void WINAPIV DbgPrint(LPCSTR fmt, ...)
290 {
291        char buf[512];
292        va_list args;
293
294        va_start(args, fmt);
295        vsprintf(buf,fmt, args);
296        va_end(args);
297
298         MESSAGE("DbgPrint says: %s",buf);
299         /* hmm, raise exception? */
300 }
301
302 /******************************************************************************
303  *  RtlAcquirePebLock           [NTDLL.@]
304  */
305 VOID WINAPI RtlAcquirePebLock(void)
306 {
307     RtlEnterCriticalSection( &peb_lock );
308 }
309
310 /******************************************************************************
311  *  RtlReleasePebLock           [NTDLL.@]
312  */
313 VOID WINAPI RtlReleasePebLock(void)
314 {
315     RtlLeaveCriticalSection( &peb_lock );
316 }
317
318 /******************************************************************************
319  *  RtlNewSecurityObject                [NTDLL.@]
320  */
321 DWORD WINAPI RtlNewSecurityObject(DWORD x1,DWORD x2,DWORD x3,DWORD x4,DWORD x5,DWORD x6) {
322         FIXME("(0x%08lx,0x%08lx,0x%08lx,0x%08lx,0x%08lx,0x%08lx),stub!\n",x1,x2,x3,x4,x5,x6);
323         return 0;
324 }
325
326 /******************************************************************************
327  *  RtlDeleteSecurityObject             [NTDLL.@]
328  */
329 DWORD WINAPI RtlDeleteSecurityObject(DWORD x1) {
330         FIXME("(0x%08lx),stub!\n",x1);
331         return 0;
332 }
333
334 /**************************************************************************
335  *                 RtlNormalizeProcessParams            [NTDLL.@]
336  */
337 LPVOID WINAPI RtlNormalizeProcessParams(LPVOID x)
338 {
339     FIXME("(%p), stub\n",x);
340     return x;
341 }
342
343 /**************************************************************************
344  *                 RtlGetNtProductType                  [NTDLL.@]
345  */
346 BOOLEAN WINAPI RtlGetNtProductType(LPDWORD type)
347 {
348     FIXME("(%p): stub\n", type);
349     *type=3; /* dunno. 1 for client, 3 for server? */
350     return 1;
351 }
352
353 /**************************************************************************
354  *                 _chkstk                              [NTDLL.@]
355  *
356  * Glorified "enter xxxx".
357  */
358 void WINAPI NTDLL_chkstk( CONTEXT86 *context )
359 {
360     context->Esp -= context->Eax;
361 }
362
363 /**************************************************************************
364  *                 _alloca_probe                        [NTDLL.@]
365  *
366  * Glorified "enter xxxx".
367  */
368 void WINAPI NTDLL_alloca_probe( CONTEXT86 *context )
369 {
370     context->Esp -= context->Eax;
371 }
372
373 /******************************************************************************
374  *  RtlInitializeGenericTable           [NTDLL.@]
375  */
376 PVOID WINAPI RtlInitializeGenericTable(PVOID pTable, PVOID arg2, PVOID arg3, PVOID arg4, PVOID arg5)
377 {
378   FIXME("(%p,%p,%p,%p,%p) stub!\n", pTable, arg2, arg3, arg4, arg5);
379   return NULL;
380 }
381
382 /******************************************************************************
383  *  RtlMoveMemory   [NTDLL.@]
384  *
385  * Move a block of memory that may overlap.
386  *
387  * PARAMS
388  *  Destination [O] End destination for block
389  *  Source      [O] Where to start copying from
390  *  Length      [I] Number of bytes to copy
391  *
392  * RETURNS
393  *  Nothing.
394  */
395 #undef RtlMoveMemory
396 VOID WINAPI RtlMoveMemory( VOID *Destination, CONST VOID *Source, SIZE_T Length )
397 {
398     memmove(Destination, Source, Length);
399 }
400
401 /******************************************************************************
402  *  RtlFillMemory   [NTDLL.@]
403  *
404  * Set a block of memory with a value.
405  *
406  * PARAMS
407  *  Destination [O] Block to fill
408  *  Length      [I] Number of bytes to fill
409  *  Fill        [I] Value to set
410  *
411  * RETURNS
412  *  Nothing.
413  */
414 #undef RtlFillMemory
415 VOID WINAPI RtlFillMemory( VOID *Destination, SIZE_T Length, BYTE Fill )
416 {
417     memset(Destination, Fill, Length);
418 }
419
420 /******************************************************************************
421  *  RtlZeroMemory   [NTDLL.@]
422  *
423  * Set a block of memory with 0's.
424  *
425  * PARAMS
426  *  Destination [O] Block to fill
427  *  Length      [I] Number of bytes to fill
428  *
429  * RETURNS
430  *  Nothing.
431  */
432 #undef RtlZeroMemory
433 VOID WINAPI RtlZeroMemory( VOID *Destination, SIZE_T Length )
434 {
435     memset(Destination, 0, Length);
436 }
437
438 /******************************************************************************
439  *  RtlCompareMemory   [NTDLL.@]
440  *
441  * Compare one block of memory with another
442  *
443  * PARAMS
444  *  Source1 [I] Source block
445  *  Source2 [I] Block to compare to Source1
446  *  Length  [I] Number of bytes to fill
447  *
448  * RETURNS
449  *  The length of the first byte at which Source1 and Source2 differ, or Length
450  *  if they are the same.
451  */
452 SIZE_T WINAPI RtlCompareMemory( const VOID *Source1, const VOID *Source2, SIZE_T Length)
453 {
454     SIZE_T i;
455     for(i=0; (i<Length) && (((LPBYTE)Source1)[i]==((LPBYTE)Source2)[i]); i++);
456     return i;
457 }
458
459 /******************************************************************************
460  *  RtlCompareMemoryUlong   [NTDLL.@]
461  *
462  * Compare a block of memory with a value, a ULONG at a time
463  *
464  * PARAMS
465  *  Source1 [I] Source block. This must be ULONG aligned
466  *  Length  [I] Number of bytes to compare. This should be a multiple of 4
467  *  dwVal   [I] Value to compare to
468  *
469  * RETURNS
470  *  The byte position of the first byte at which Source1 is not dwVal.
471  */
472 SIZE_T WINAPI RtlCompareMemoryUlong(const ULONG *Source1, SIZE_T Length, ULONG dwVal)
473 {
474     SIZE_T i;
475     for(i = 0; i < Length/sizeof(ULONG) && Source1[i] == dwVal; i++);
476     return i * sizeof(ULONG);
477 }
478
479 /******************************************************************************
480  *  RtlAssert                           [NTDLL.@]
481  *
482  * Fail a debug assertion.
483  *
484  * RETURNS
485  *  Nothing. This call does not return control to its caller.
486  *
487  * NOTES
488  * Not implemented in non-debug versions.
489  */
490 void WINAPI RtlAssert(LPVOID x1,LPVOID x2,DWORD x3, DWORD x4)
491 {
492         FIXME("(%p,%p,0x%08lx,0x%08lx),stub\n",x1,x2,x3,x4);
493 }
494
495 /******************************************************************************
496  *  RtlGetNtVersionNumbers       [NTDLL.@]
497  *
498  * Get the version numbers of the run time library.
499  *
500  * PARAMS
501  *  major [O] Destination for the Major version
502  *  minor [O] Destination for the Minor version
503  *  build [O] Destination for the Build version
504  *
505  * RETURNS
506  *  Nothing.
507  *
508  * NOTES
509  * Introduced in Windows XP (NT5.1)
510  */
511 void WINAPI RtlGetNtVersionNumbers(LPDWORD major, LPDWORD minor, LPDWORD build)
512 {
513         OSVERSIONINFOEXW versionInfo;
514         versionInfo.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEXW);
515         GetVersionExW((OSVERSIONINFOW*)&versionInfo);
516
517         if (major)
518         {
519                 /* msvcrt.dll as released with XP Home fails in DLLMain() if the
520                  * major version is not 5. So, we should never set a version < 5 ...
521                  * This makes sense since this call didn't exist before XP anyway.
522                  */
523                 *major = versionInfo.dwMajorVersion < 5 ? 5 : versionInfo.dwMajorVersion;
524         }
525
526         if (minor)
527         {
528                 *minor = versionInfo.dwMinorVersion;
529         }
530
531         if (build)
532         {
533                 /* FIXME: Does anybody know the real formula? */
534                 *build = (0xF0000000 | versionInfo.dwBuildNumber);
535         }
536 }
537
538 /*************************************************************************
539  * RtlFillMemoryUlong   [NTDLL.@]
540  *
541  * Fill memory with a 32 bit (dword) value.
542  *
543  * PARAMS
544  *  lpDest  [I] Bitmap pointer
545  *  ulCount [I] Number of dwords to write
546  *  ulValue [I] Value to fill with
547  *
548  * RETURNS
549  *  Nothing.
550  */
551 VOID WINAPI RtlFillMemoryUlong(ULONG* lpDest, ULONG ulCount, ULONG ulValue)
552 {
553   TRACE("(%p,%ld,%ld)\n", lpDest, ulCount, ulValue);
554
555   ulCount /= sizeof(ULONG);
556   while(ulCount--)
557     *lpDest++ = ulValue;
558 }
559
560 /*********************************************************************
561  *                  RtlComputeCrc32   [NTDLL.@]
562  *
563  * Calculate the CRC32 checksum of a block of bytes
564  *
565  * PARAMS
566  *  dwInitial [I] Initial CRC value
567  *  pData     [I] Data block
568  *  iLen      [I] Length of the byte block
569  *
570  * RETURNS
571  *  The cumulative CRC32 of dwInitial and iLen bytes of the pData block.
572  */
573 DWORD WINAPI RtlComputeCrc32(DWORD dwInitial, PBYTE pData, INT iLen)
574 {
575   DWORD crc = ~dwInitial;
576
577   TRACE("(%ld,%p,%d)\n", dwInitial, pData, iLen);
578
579   while (iLen > 0)
580   {
581     crc = CRC_table[(crc ^ *pData) & 0xff] ^ (crc >> 8);
582     pData++;
583     iLen--;
584   }
585   return ~crc;
586 }
587
588
589 /*************************************************************************
590  * RtlUlonglongByteSwap    [NTDLL.@]
591  *
592  * Swap the bytes of an unsigned long long value.
593  *
594  * PARAMS
595  *  i [I] Value to swap bytes of
596  *
597  * RETURNS
598  *  The value with its bytes swapped.
599  */
600 ULONGLONG __cdecl RtlUlonglongByteSwap(ULONGLONG i)
601 {
602   return ((ULONGLONG)RtlUlongByteSwap(i) << 32) | RtlUlongByteSwap(i>>32);
603 }
604
605 /*************************************************************************
606  * RtlUlongByteSwap    [NTDLL.@]
607  *
608  * Swap the bytes of an unsigned int value.
609  *
610  * NOTES
611  *  ix86 version takes argument in %ecx. Other systems use the inline version.
612  */
613 #ifdef __i386__
614 __ASM_GLOBAL_FUNC(NTDLL_RtlUlongByteSwap,
615                   "movl %ecx,%eax\n\t"
616                   "bswap %eax\n\t"
617                   "ret");
618 #endif
619
620 /*************************************************************************
621  * RtlUshortByteSwap    [NTDLL.@]
622  *
623  * Swap the bytes of an unsigned short value.
624  *
625  * NOTES
626  *  i386 version takes argument in %cx. Other systems use the inline version.
627  */
628 #ifdef __i386__
629 __ASM_GLOBAL_FUNC(NTDLL_RtlUshortByteSwap,
630                   "movb %ch,%al\n\t"
631                   "movb %cl,%ah\n\t"
632                   "ret");
633 #endif
634
635
636 /*************************************************************************
637  * RtlUniform   [NTDLL.@]
638  *
639  * Generates an uniform random number
640  *
641  * PARAMS
642  *  seed [O] The seed of the Random function
643  *
644  * RETURNS
645  *  It returns a random number uniformly distributed over [0..MAXLONG-1].
646  *
647  * NOTES
648  *  Generates an uniform random number using D.H. Lehmer's 1948 algorithm.
649  *  In our case the algorithm is:
650  *
651  *  result = (*seed * 0x7fffffed + 0x7fffffc3) % MAXLONG;
652  *
653  *  *seed = result;
654  *
655  * DIFFERENCES
656  *  The native documentation states that the random number is
657  *  uniformly distributed over [0..MAXLONG]. In reality the native
658  *  function and our function return a random number uniformly
659  *  distributed over [0..MAXLONG-1].
660  */
661 ULONG WINAPI RtlUniform (PULONG seed)
662 {
663     ULONG result;
664
665    /*
666     * Instead of the algorithm stated above, we use the algorithm
667     * below, which is totally equivalent (see the tests), but does
668     * not use a division and therefore is faster.
669     */
670     result = *seed * 0xffffffed + 0x7fffffc3;
671     if (result == 0xffffffff || result == 0x7ffffffe) {
672         result = (result + 2) & MAXLONG;
673     } else if (result == 0x7fffffff) {
674         result = 0;
675     } else if ((result & 0x80000000) == 0) {
676         result = result + (~result & 1);
677     } else {
678         result = (result + (result & 1)) & MAXLONG;
679     } /* if */
680     *seed = result;
681     return result;
682 }
683
684
685 /*************************************************************************
686  * RtlRandom   [NTDLL.@]
687  *
688  * Generates a random number
689  *
690  * PARAMS
691  *  seed [O] The seed of the Random function
692  *
693  * RETURNS
694  *  It returns a random number distributed over [0..MAXLONG-1].
695  */
696 ULONG WINAPI RtlRandom (PULONG seed)
697 {
698     static ULONG saved_value[128] =
699     { /*   0 */ 0x4c8bc0aa, 0x4c022957, 0x2232827a, 0x2f1e7626, 0x7f8bdafb, 0x5c37d02a, 0x0ab48f72, 0x2f0c4ffa,
700       /*   8 */ 0x290e1954, 0x6b635f23, 0x5d3885c0, 0x74b49ff8, 0x5155fa54, 0x6214ad3f, 0x111e9c29, 0x242a3a09,
701       /*  16 */ 0x75932ae1, 0x40ac432e, 0x54f7ba7a, 0x585ccbd5, 0x6df5c727, 0x0374dad1, 0x7112b3f1, 0x735fc311,
702       /*  24 */ 0x404331a9, 0x74d97781, 0x64495118, 0x323e04be, 0x5974b425, 0x4862e393, 0x62389c1d, 0x28a68b82,
703       /*  32 */ 0x0f95da37, 0x7a50bbc6, 0x09b0091c, 0x22cdb7b4, 0x4faaed26, 0x66417ccd, 0x189e4bfa, 0x1ce4e8dd,
704       /*  40 */ 0x5274c742, 0x3bdcf4dc, 0x2d94e907, 0x32eac016, 0x26d33ca3, 0x60415a8a, 0x31f57880, 0x68c8aa52,
705       /*  48 */ 0x23eb16da, 0x6204f4a1, 0x373927c1, 0x0d24eb7c, 0x06dd7379, 0x2b3be507, 0x0f9c55b1, 0x2c7925eb,
706       /*  56 */ 0x36d67c9a, 0x42f831d9, 0x5e3961cb, 0x65d637a8, 0x24bb3820, 0x4d08e33d, 0x2188754f, 0x147e409e,
707       /*  64 */ 0x6a9620a0, 0x62e26657, 0x7bd8ce81, 0x11da0abb, 0x5f9e7b50, 0x23e444b6, 0x25920c78, 0x5fc894f0,
708       /*  72 */ 0x5e338cbb, 0x404237fd, 0x1d60f80f, 0x320a1743, 0x76013d2b, 0x070294ee, 0x695e243b, 0x56b177fd,
709       /*  80 */ 0x752492e1, 0x6decd52f, 0x125f5219, 0x139d2e78, 0x1898d11e, 0x2f7ee785, 0x4db405d8, 0x1a028a35,
710       /*  88 */ 0x63f6f323, 0x1f6d0078, 0x307cfd67, 0x3f32a78a, 0x6980796c, 0x462b3d83, 0x34b639f2, 0x53fce379,
711       /*  96 */ 0x74ba50f4, 0x1abc2c4b, 0x5eeaeb8d, 0x335a7a0d, 0x3973dd20, 0x0462d66b, 0x159813ff, 0x1e4643fd,
712       /* 104 */ 0x06bc5c62, 0x3115e3fc, 0x09101613, 0x47af2515, 0x4f11ec54, 0x78b99911, 0x3db8dd44, 0x1ec10b9b,
713       /* 112 */ 0x5b5506ca, 0x773ce092, 0x567be81a, 0x5475b975, 0x7a2cde1a, 0x494536f5, 0x34737bb4, 0x76d9750b,
714       /* 120 */ 0x2a1f6232, 0x2e49644d, 0x7dddcbe7, 0x500cebdb, 0x619dab9e, 0x48c626fe, 0x1cda3193, 0x52dabe9d };
715     ULONG rand;
716     int pos;
717     ULONG result;
718
719     rand = (*seed * 0x7fffffed + 0x7fffffc3) % 0x7fffffff;
720     *seed = (rand * 0x7fffffed + 0x7fffffc3) % 0x7fffffff;
721     pos = *seed & 0x7f;
722     result = saved_value[pos];
723     saved_value[pos] = rand;
724     return(result);
725 }
726
727
728 /*************************************************************************
729  * RtlAreAllAccessesGranted   [NTDLL.@]
730  *
731  * Check if all desired accesses are granted
732  *
733  * RETURNS
734  *  TRUE: All desired accesses are granted
735  *  FALSE: Otherwise
736  */
737 BOOLEAN WINAPI RtlAreAllAccessesGranted(
738     ACCESS_MASK GrantedAccess,
739     ACCESS_MASK DesiredAccess)
740 {
741     return (GrantedAccess & DesiredAccess) == DesiredAccess;
742 }
743
744
745 /*************************************************************************
746  * RtlAreAnyAccessesGranted   [NTDLL.@]
747  *
748  * Check if at least one of the desired accesses is granted
749  *
750  * RETURNS
751  *  TRUE: At least one of the desired accesses is granted
752  *  FALSE: Otherwise
753  */
754 BOOLEAN WINAPI RtlAreAnyAccessesGranted(
755     ACCESS_MASK GrantedAccess,
756     ACCESS_MASK DesiredAccess)
757 {
758     return (GrantedAccess & DesiredAccess) != 0;
759 }
760
761
762 /*************************************************************************
763  * RtlMapGenericMask   [NTDLL.@]
764  *
765  * Determine the nongeneric access rights specified by an access mask
766  *
767  * RETURNS
768  *  Nothing.
769  */
770 void WINAPI RtlMapGenericMask(
771     PACCESS_MASK AccessMask,
772     const GENERIC_MAPPING *GenericMapping)
773 {
774     if (*AccessMask & GENERIC_READ) {
775         *AccessMask |= GenericMapping->GenericRead;
776     } /* if */
777
778     if (*AccessMask & GENERIC_WRITE) {
779         *AccessMask |= GenericMapping->GenericWrite;
780     } /* if */
781
782     if (*AccessMask & GENERIC_EXECUTE) {
783         *AccessMask |= GenericMapping->GenericExecute;
784     } /* if */
785
786     if (*AccessMask & GENERIC_ALL) {
787         *AccessMask |= GenericMapping->GenericAll;
788     } /* if */
789
790     *AccessMask &= 0x0FFFFFFF;
791 }
792
793
794 /*************************************************************************
795  * RtlCopyLuid   [NTDLL.@]
796  *
797  * Copies the LuidSrc to LuidDest.
798  *
799  * RETURNS
800  *  Nothing.
801  */
802 void WINAPI RtlCopyLuid (PLUID LuidDest, const LUID *LuidSrc)
803 {
804     *LuidDest = *LuidSrc;
805 }
806
807
808 /*************************************************************************
809  * RtlEqualLuid   [NTDLL.@]
810  *
811  * Compares two local unique ID's.
812  *
813  * RETURNS
814  *  TRUE: The two LUID's are equal.
815  *  FALSE: Otherwise
816  */
817 BOOLEAN WINAPI RtlEqualLuid (const LUID *Luid1, const LUID *Luid2)
818 {
819   return (Luid1->LowPart ==  Luid2->LowPart && Luid1->HighPart == Luid2->HighPart);
820 }
821
822
823 /*************************************************************************
824  * RtlCopyLuidAndAttributesArray   [NTDLL.@]
825  *
826  * Copies an array of LUID's and attributes.
827  *
828  * RETURNS
829  *  Nothing.
830  */
831 void WINAPI RtlCopyLuidAndAttributesArray(
832     ULONG Count,
833     const LUID_AND_ATTRIBUTES *Src,
834     PLUID_AND_ATTRIBUTES Dest)
835 {
836     ULONG i;
837
838     for (i = 0; i < Count; i++) Dest[i] = Src[i];
839 }