dlls/mmsystem.dll16/mmio16.c

   1 /*
   2  * MMSYSTEM mmio* functions
   3  *
   4  * Copyright 1993               Martin Ayotte
   5  *           1998-2003,2009     Eric Pouech
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  20  */
  21
  22 #include <stdarg.h>
  23 #include <string.h>
  24
  25 #define NONAMELESSUNION
  26 #define NONAMELESSSTRUCT
  27 #include "windef.h"
  28 #include "winbase.h"
  29 #include "mmsystem.h"
  30 #include "winternl.h"
  31 #include "wownt32.h"
  32 #include "winnls.h"
  33
  34 #include "wine/winuser16.h"
  35 #include "winemm16.h"
  36
  37 #include "wine/debug.h"
  38
  39 WINE_DEFAULT_DEBUG_CHANNEL(mmsys);
  40
  41 /* ###################################################
  42  * #                     MMIO                        #
  43  * ###################################################
  44  */
  45 #include <pshpack1.h>
  46 #define MMIO_MAX_THUNKS      32
  47
  48 static struct mmio_thunk
  49 {
  50     BYTE        popl_eax;       /* popl  %eax (return address) */
  51     BYTE        pushl_func;     /* pushl $pfn16 (16bit callback function) */
  52     LPMMIOPROC16 pfn16;
  53     BYTE        pushl_eax;      /* pushl %eax */
  54     BYTE        jmp;            /* ljmp MMIO_Callback1632 */
  55     DWORD       callback;
  56     HMMIO       hMmio;          /* Handle to 32bit mmio object */
  57     SEGPTR      segbuffer;      /* actual segmented ptr to buffer */
  58 } *MMIO_Thunks;
  59
  60 #include <poppack.h>
  61
  62 static CRITICAL_SECTION mmio_cs;
  63 static CRITICAL_SECTION_DEBUG mmio_critsect_debug =
  64 {
  65     0, 0, &mmio_cs,
  66     { &mmio_critsect_debug.ProcessLocksList, &mmio_critsect_debug.ProcessLocksList },
  67       0, 0, { (DWORD_PTR)(__FILE__ ": mmsystem_mmio_cs") }
  68 };
  69 static CRITICAL_SECTION mmio_cs = { &mmio_critsect_debug, -1, 0, 0, 0, 0 };
  70
  71 /****************************************************************
  72  *                      MMIO_Map32To16                  [INTERNAL]
  73  */
  74 static LRESULT  MMIO_Map32To16(DWORD wMsg, LPARAM* lp1, LPARAM* lp2)
  75 {
  76     switch (wMsg) {
  77     case MMIOM_CLOSE:
  78     case MMIOM_SEEK:
  79         /* nothing to do */
  80         break;
  81     case MMIOM_OPEN:
  82     case MMIOM_READ:
  83     case MMIOM_WRITE:
  84     case MMIOM_WRITEFLUSH:
  85         *lp1 = MapLS( (void *)*lp1 );
  86         break;
  87     case MMIOM_RENAME:
  88         *lp1 = MapLS( (void *)*lp1 );
  89         *lp2 = MapLS( (void *)*lp2 );
  90         break;
  91     default:
  92         if (wMsg < MMIOM_USER)
  93             TRACE("Not a mappable message (%d)\n", wMsg);
  94     }
  95     return MMSYSERR_NOERROR;
  96 }
  97
  98 /****************************************************************
  99  *              MMIO_UnMap32To16                        [INTERNAL]
 100  */
 101 static LRESULT  MMIO_UnMap32To16(DWORD wMsg, LPARAM lParam1, LPARAM lParam2,
 102                                  LPARAM lp1, LPARAM lp2)
 103 {
 104     switch (wMsg) {
 105     case MMIOM_CLOSE:
 106     case MMIOM_SEEK:
 107         /* nothing to do */
 108         break;
 109     case MMIOM_OPEN:
 110     case MMIOM_READ:
 111     case MMIOM_WRITE:
 112     case MMIOM_WRITEFLUSH:
 113         UnMapLS( lp1 );
 114         break;
 115     case MMIOM_RENAME:
 116         UnMapLS( lp1 );
 117         UnMapLS( lp2 );
 118         break;
 119     default:
 120         if (wMsg < MMIOM_USER)
 121             TRACE("Not a mappable message (%d)\n", wMsg);
 122     }
 123     return MMSYSERR_NOERROR;
 124 }
 125
 126 /******************************************************************
 127  *              MMIO_Callback3216
 128  *
 129  *
 130  */
 131 static LRESULT MMIO_Callback3216(SEGPTR cb16, LPMMIOINFO lpmmioinfo, UINT uMessage,
 132                                  LPARAM lParam1, LPARAM lParam2)
 133 {
 134     DWORD               result;
 135     MMIOINFO16          mmioInfo16;
 136     SEGPTR              segmmioInfo16;
 137     LPARAM              lp1 = lParam1, lp2 = lParam2;
 138     WORD                args[7];
 139
 140     if (!cb16) return MMSYSERR_INVALPARAM;
 141
 142     memset(&mmioInfo16, 0, sizeof(MMIOINFO16));
 143     mmioInfo16.lDiskOffset = lpmmioinfo->lDiskOffset;
 144     mmioInfo16.adwInfo[0]  = lpmmioinfo->adwInfo[0];
 145     mmioInfo16.adwInfo[1]  = lpmmioinfo->adwInfo[1];
 146     mmioInfo16.adwInfo[2]  = lpmmioinfo->adwInfo[2];
 147     /* map (lParam1, lParam2) into (lp1, lp2) 32=>16 */
 148     if ((result = MMIO_Map32To16(uMessage, &lp1, &lp2)) != MMSYSERR_NOERROR)
 149         return result;
 150
 151     segmmioInfo16 = MapLS(&mmioInfo16);
 152     args[6] = HIWORD(segmmioInfo16);
 153     args[5] = LOWORD(segmmioInfo16);
 154     args[4] = uMessage;
 155     args[3] = HIWORD(lp1);
 156     args[2] = LOWORD(lp1);
 157     args[1] = HIWORD(lp2);
 158     args[0] = LOWORD(lp2);
 159     WOWCallback16Ex( cb16, WCB16_PASCAL, sizeof(args), args, &result );
 160     UnMapLS(segmmioInfo16);
 161     MMIO_UnMap32To16(uMessage, lParam1, lParam2, lp1, lp2);
 162
 163     lpmmioinfo->lDiskOffset = mmioInfo16.lDiskOffset;
 164     lpmmioinfo->adwInfo[0]  = mmioInfo16.adwInfo[0];
 165     lpmmioinfo->adwInfo[1]  = mmioInfo16.adwInfo[1];
 166     lpmmioinfo->adwInfo[2]  = mmioInfo16.adwInfo[2];
 167
 168     return result;
 169 }
 170
 171 /******************************************************************
 172  *              MMIO_AddThunk
 173  *
 174  */
 175 static struct mmio_thunk*       MMIO_AddThunk(LPMMIOPROC16 pfn16, HPSTR segbuf)
 176 {
 177     struct mmio_thunk* thunk;
 178
 179     if (!MMIO_Thunks)
 180     {
 181         MMIO_Thunks = VirtualAlloc(NULL, MMIO_MAX_THUNKS * sizeof(*MMIO_Thunks), MEM_COMMIT,
 182                                    PAGE_EXECUTE_READWRITE);
 183         if (!MMIO_Thunks) return NULL;
 184         for (thunk = MMIO_Thunks; thunk < &MMIO_Thunks[MMIO_MAX_THUNKS]; thunk++)
 185         {
 186             thunk->popl_eax     = 0x58;   /* popl  %eax */
 187             thunk->pushl_func   = 0x68;   /* pushl $pfn16 */
 188             thunk->pfn16        = 0;
 189             thunk->pushl_eax    = 0x50;   /* pushl %eax */
 190             thunk->jmp          = 0xe9;   /* jmp MMIO_Callback3216 */
 191             thunk->callback     = (char *)MMIO_Callback3216 - (char *)(&thunk->callback + 1);
 192             thunk->hMmio        = NULL;
 193             thunk->segbuffer    = 0;
 194         }
 195     }
 196     for (thunk = MMIO_Thunks; thunk < &MMIO_Thunks[MMIO_MAX_THUNKS]; thunk++)
 197     {
 198         if (thunk->pfn16 == 0 && thunk->hMmio == NULL)
 199         {
 200             thunk->pfn16 = pfn16;
 201             thunk->hMmio = NULL;
 202             thunk->segbuffer = (SEGPTR)segbuf;
 203             return thunk;
 204         }
 205     }
 206     FIXME("Out of mmio-thunks. Bump MMIO_MAX_THUNKS\n");
 207     return NULL;
 208 }
 209
 210 /******************************************************************
 211  *              MMIO_HasThunk
 212  *
 213  */
 214 static struct mmio_thunk*    MMIO_HasThunk(HMMIO hmmio)
 215 {
 216     struct mmio_thunk* thunk;
 217
 218     if (!MMIO_Thunks) return NULL;
 219     for (thunk = MMIO_Thunks; thunk < &MMIO_Thunks[MMIO_MAX_THUNKS]; thunk++)
 220     {
 221         if (thunk->hMmio == hmmio) return thunk;
 222     }
 223     return NULL;
 224 }
 225
 226 /******************************************************************
 227  *             MMIO_SetSegmentedBuffer
 228  *
 229  */
 230 static void     MMIO_SetSegmentedBuffer(struct mmio_thunk* thunk, SEGPTR ptr, BOOL release)
 231 {
 232     if (release) UnMapLS(thunk->segbuffer);
 233     thunk->segbuffer = ptr;
 234 }
 235
 236 /**************************************************************************
 237  *                              mmioOpen                [MMSYSTEM.1210]
 238  */
 239 HMMIO16 WINAPI mmioOpen16(LPSTR szFileName, MMIOINFO16* lpmmioinfo16,
 240                           DWORD dwOpenFlags)
 241 {
 242     HMMIO       ret;
 243
 244     if (lpmmioinfo16) {
 245         MMIOINFO                mmioinfo;
 246         struct mmio_thunk*      thunk = NULL;
 247
 248         memset(&mmioinfo, 0, sizeof(mmioinfo));
 249
 250         EnterCriticalSection(&mmio_cs);
 251         if (!(thunk = MMIO_AddThunk(lpmmioinfo16->pIOProc, lpmmioinfo16->pchBuffer)))
 252         {
 253             LeaveCriticalSection(&mmio_cs);
 254             return 0;
 255         }
 256
 257         mmioinfo.dwFlags     = lpmmioinfo16->dwFlags;
 258         mmioinfo.fccIOProc   = lpmmioinfo16->fccIOProc;
 259         mmioinfo.pIOProc     = lpmmioinfo16->pIOProc ? (LPMMIOPROC)thunk : 0;
 260         mmioinfo.cchBuffer   = lpmmioinfo16->cchBuffer;
 261         mmioinfo.pchBuffer   = MapSL((DWORD)lpmmioinfo16->pchBuffer);
 262         mmioinfo.adwInfo[0]  = lpmmioinfo16->adwInfo[0];
 263         /* if we don't have a file name, it's likely a passed open file descriptor */
 264         if (!szFileName)
 265             mmioinfo.adwInfo[0] = (DWORD)DosFileHandleToWin32Handle(mmioinfo.adwInfo[0]);
 266         mmioinfo.adwInfo[1]  = lpmmioinfo16->adwInfo[1];
 267         mmioinfo.adwInfo[2]  = lpmmioinfo16->adwInfo[2];
 268
 269         ret = mmioOpenA(szFileName, &mmioinfo, dwOpenFlags);
 270         if (!ret || (dwOpenFlags & (MMIO_PARSE|MMIO_EXIST)))
 271         {
 272             thunk->pfn16 = NULL;
 273             thunk->hMmio = NULL;
 274         }
 275         else thunk->hMmio = ret;
 276         if (ret && (dwOpenFlags & MMIO_ALLOCBUF))
 277         {
 278             MMIOINFO    m;
 279             if (lpmmioinfo16->pchBuffer) FIXME("ooch\n");
 280             /* FIXME: check whether mmioOpen should set pchBuffer */
 281             mmioGetInfo(ret, &m, 0);
 282             thunk->segbuffer = MapLS(m.pchBuffer);
 283         }
 284         LeaveCriticalSection(&mmio_cs);
 285
 286         lpmmioinfo16->wErrorRet = mmioinfo.wErrorRet;
 287         lpmmioinfo16->hmmio     = HMMIO_16(mmioinfo.hmmio);
 288     } else {
 289         ret = mmioOpenA(szFileName, NULL, dwOpenFlags);
 290     }
 291     return HMMIO_16(ret);
 292 }
 293
 294 /**************************************************************************
 295  *                              mmioClose               [MMSYSTEM.1211]
 296  */
 297 MMRESULT16 WINAPI mmioClose16(HMMIO16 hmmio, UINT16 uFlags)
 298 {
 299     MMRESULT ret;
 300
 301     EnterCriticalSection(&mmio_cs);
 302     ret = mmioClose(HMMIO_32(hmmio), uFlags);
 303     if (ret == MMSYSERR_NOERROR)
 304     {
 305         struct mmio_thunk* thunk;
 306
 307         if ((thunk = MMIO_HasThunk(HMMIO_32(hmmio))))
 308         {
 309             MMIO_SetSegmentedBuffer(thunk, 0, TRUE);
 310             thunk->pfn16 = NULL;
 311             thunk->hMmio = NULL;
 312         }
 313     }
 314     LeaveCriticalSection(&mmio_cs);
 315     return ret;
 316 }
 317
 318 /**************************************************************************
 319  *                              mmioRead                [MMSYSTEM.1212]
 320  */
 321 LONG WINAPI mmioRead16(HMMIO16 hmmio, HPSTR pch, LONG cch)
 322 {
 323     return mmioRead(HMMIO_32(hmmio), pch, cch);
 324 }
 325
 326 /**************************************************************************
 327  *                              mmioWrite               [MMSYSTEM.1213]
 328  */
 329 LONG WINAPI mmioWrite16(HMMIO16 hmmio, HPCSTR pch, LONG cch)
 330 {
 331     return mmioWrite(HMMIO_32(hmmio),pch,cch);
 332 }
 333
 334 /**************************************************************************
 335  *                              mmioSeek                [MMSYSTEM.1214]
 336  */
 337 LONG WINAPI mmioSeek16(HMMIO16 hmmio, LONG lOffset, INT16 iOrigin)
 338 {
 339     return mmioSeek(HMMIO_32(hmmio), lOffset, iOrigin);
 340 }
 341
 342 /**************************************************************************
 343  *                              mmioGetInfo             [MMSYSTEM.1215]
 344  */
 345 MMRESULT16 WINAPI mmioGetInfo16(HMMIO16 hmmio, MMIOINFO16* lpmmioinfo, UINT16 uFlags)
 346 {
 347     MMIOINFO            mmioinfo;
 348     MMRESULT            ret;
 349     struct mmio_thunk*  thunk;
 350
 351     TRACE("(0x%04x,%p,0x%08x)\n", hmmio, lpmmioinfo, uFlags);
 352
 353     EnterCriticalSection(&mmio_cs);
 354     if ((thunk = MMIO_HasThunk(HMMIO_32(hmmio))) == NULL)
 355     {
 356         LeaveCriticalSection(&mmio_cs);
 357         return MMSYSERR_INVALHANDLE;
 358     }
 359
 360     ret = mmioGetInfo(HMMIO_32(hmmio), &mmioinfo, uFlags);
 361     if (ret != MMSYSERR_NOERROR)
 362     {
 363         LeaveCriticalSection(&mmio_cs);
 364         return ret;
 365     }
 366
 367     lpmmioinfo->dwFlags     = mmioinfo.dwFlags;
 368     lpmmioinfo->fccIOProc   = mmioinfo.fccIOProc;
 369     lpmmioinfo->pIOProc     = thunk->pfn16;
 370     lpmmioinfo->wErrorRet   = mmioinfo.wErrorRet;
 371     lpmmioinfo->hTask       = HTASK_16(mmioinfo.hTask);
 372     lpmmioinfo->cchBuffer   = mmioinfo.cchBuffer;
 373     lpmmioinfo->pchBuffer   = (void*)thunk->segbuffer;
 374     lpmmioinfo->pchNext     = (void*)(thunk->segbuffer + (mmioinfo.pchNext - mmioinfo.pchBuffer));
 375     lpmmioinfo->pchEndRead  = (void*)(thunk->segbuffer + (mmioinfo.pchEndRead - mmioinfo.pchBuffer));
 376     lpmmioinfo->pchEndWrite = (void*)(thunk->segbuffer + (mmioinfo.pchEndWrite - mmioinfo.pchBuffer));
 377     lpmmioinfo->lBufOffset  = mmioinfo.lBufOffset;
 378     lpmmioinfo->lDiskOffset = mmioinfo.lDiskOffset;
 379     lpmmioinfo->adwInfo[0]  = mmioinfo.adwInfo[0];
 380     lpmmioinfo->adwInfo[1]  = mmioinfo.adwInfo[1];
 381     lpmmioinfo->adwInfo[2]  = mmioinfo.adwInfo[2];
 382     lpmmioinfo->dwReserved1 = 0;
 383     lpmmioinfo->dwReserved2 = 0;
 384     lpmmioinfo->hmmio = HMMIO_16(mmioinfo.hmmio);
 385     LeaveCriticalSection(&mmio_cs);
 386
 387     return MMSYSERR_NOERROR;
 388 }
 389
 390 /**************************************************************************
 391  *                              mmioSetInfo             [MMSYSTEM.1216]
 392  */
 393 MMRESULT16 WINAPI mmioSetInfo16(HMMIO16 hmmio, const MMIOINFO16* lpmmioinfo, UINT16 uFlags)
 394 {
 395     MMIOINFO            mmioinfo;
 396     MMRESULT            ret;
 397
 398     TRACE("(0x%04x,%p,0x%08x)\n",hmmio,lpmmioinfo,uFlags);
 399
 400     ret = mmioGetInfo(HMMIO_32(hmmio), &mmioinfo, 0);
 401     if (ret != MMSYSERR_NOERROR) return ret;
 402
 403     /* check if seg and lin buffers are the same */
 404     if (mmioinfo.cchBuffer != lpmmioinfo->cchBuffer  ||
 405         mmioinfo.pchBuffer != MapSL((DWORD)lpmmioinfo->pchBuffer))
 406         return MMSYSERR_INVALPARAM;
 407
 408     /* check pointers coherence */
 409     if (lpmmioinfo->pchNext < lpmmioinfo->pchBuffer ||
 410         lpmmioinfo->pchNext > lpmmioinfo->pchBuffer + lpmmioinfo->cchBuffer ||
 411         lpmmioinfo->pchEndRead < lpmmioinfo->pchBuffer ||
 412         lpmmioinfo->pchEndRead > lpmmioinfo->pchBuffer + lpmmioinfo->cchBuffer ||
 413         lpmmioinfo->pchEndWrite < lpmmioinfo->pchBuffer ||
 414         lpmmioinfo->pchEndWrite > lpmmioinfo->pchBuffer + lpmmioinfo->cchBuffer)
 415         return MMSYSERR_INVALPARAM;
 416
 417     mmioinfo.pchNext     = mmioinfo.pchBuffer + (lpmmioinfo->pchNext     - lpmmioinfo->pchBuffer);
 418     mmioinfo.pchEndRead  = mmioinfo.pchBuffer + (lpmmioinfo->pchEndRead  - lpmmioinfo->pchBuffer);
 419     mmioinfo.pchEndWrite = mmioinfo.pchBuffer + (lpmmioinfo->pchEndWrite - lpmmioinfo->pchBuffer);
 420
 421     return mmioSetInfo(HMMIO_32(hmmio), &mmioinfo, uFlags);
 422 }
 423
 424 /**************************************************************************
 425  *                              mmioSetBuffer           [MMSYSTEM.1217]
 426  */
 427 MMRESULT16 WINAPI mmioSetBuffer16(HMMIO16 hmmio, SEGPTR pchBuffer,
 428                                   LONG cchBuffer, UINT16 uFlags)
 429 {
 430     MMRESULT    ret = mmioSetBuffer(HMMIO_32(hmmio), MapSL(pchBuffer),
 431                                     cchBuffer, uFlags);
 432
 433     if (ret == MMSYSERR_NOERROR)
 434     {
 435         struct mmio_thunk* thunk;
 436
 437         if ((thunk = MMIO_HasThunk(HMMIO_32(hmmio))) == NULL)
 438         {
 439             FIXME("really ?\n");
 440             return MMSYSERR_INVALHANDLE;
 441         }
 442         MMIO_SetSegmentedBuffer(thunk, pchBuffer, TRUE);
 443     }
 444     else
 445         UnMapLS(pchBuffer);
 446     return ret;
 447 }
 448
 449 /**************************************************************************
 450  *                              mmioFlush               [MMSYSTEM.1218]
 451  */
 452 MMRESULT16 WINAPI mmioFlush16(HMMIO16 hmmio, UINT16 uFlags)
 453 {
 454     return mmioFlush(HMMIO_32(hmmio), uFlags);
 455 }
 456
 457 /***********************************************************************
 458  *                              mmioAdvance             [MMSYSTEM.1219]
 459  */
 460 MMRESULT16 WINAPI mmioAdvance16(HMMIO16 hmmio, MMIOINFO16* lpmmioinfo, UINT16 uFlags)
 461 {
 462     MMIOINFO    mmioinfo;
 463     LRESULT     ret;
 464
 465     /* WARNING: this heavily relies on mmioAdvance implementation (for choosing which
 466      * fields to init
 467      */
 468     if (lpmmioinfo)
 469     {
 470         mmioinfo.pchBuffer = MapSL((DWORD)lpmmioinfo->pchBuffer);
 471         mmioinfo.pchNext = MapSL((DWORD)lpmmioinfo->pchNext);
 472         mmioinfo.dwFlags = lpmmioinfo->dwFlags;
 473         mmioinfo.lBufOffset = lpmmioinfo->lBufOffset;
 474         ret = mmioAdvance(HMMIO_32(hmmio), &mmioinfo, uFlags);
 475     }
 476     else
 477         ret = mmioAdvance(HMMIO_32(hmmio), NULL, uFlags);
 478
 479     if (ret != MMSYSERR_NOERROR) return ret;
 480
 481     if (lpmmioinfo)
 482     {
 483         lpmmioinfo->dwFlags = mmioinfo.dwFlags;
 484         lpmmioinfo->pchNext     = (void*)(lpmmioinfo->pchBuffer + (mmioinfo.pchNext - mmioinfo.pchBuffer));
 485         lpmmioinfo->pchEndRead  = (void*)(lpmmioinfo->pchBuffer + (mmioinfo.pchEndRead - mmioinfo.pchBuffer));
 486         lpmmioinfo->pchEndWrite = (void*)(lpmmioinfo->pchBuffer + (mmioinfo.pchEndWrite - mmioinfo.pchBuffer));
 487         lpmmioinfo->lBufOffset  = mmioinfo.lBufOffset;
 488         lpmmioinfo->lDiskOffset = mmioinfo.lDiskOffset;
 489     }
 490
 491     return MMSYSERR_NOERROR;
 492 }
 493
 494 /**************************************************************************
 495  *                              mmioStringToFOURCC      [MMSYSTEM.1220]
 496  */
 497 FOURCC WINAPI mmioStringToFOURCC16(LPCSTR sz, UINT16 uFlags)
 498 {
 499     return mmioStringToFOURCCA(sz, uFlags);
 500 }
 501
 502 /**************************************************************************
 503  *              mmioInstallIOProc    [MMSYSTEM.1221]
 504  */
 505 LPMMIOPROC16 WINAPI mmioInstallIOProc16(FOURCC fccIOProc, LPMMIOPROC16 pIOProc,
 506                                         DWORD dwFlags)
 507 {
 508     struct mmio_thunk*  thunk = NULL;
 509     LPMMIOPROC pIOProc32;
 510
 511     EnterCriticalSection(&mmio_cs);
 512
 513     switch (dwFlags & (MMIO_INSTALLPROC|MMIO_REMOVEPROC|MMIO_FINDPROC)) {
 514     case MMIO_INSTALLPROC:
 515         if (!(thunk = MMIO_AddThunk(pIOProc, NULL)))
 516         {
 517             LeaveCriticalSection(&mmio_cs);
 518             return NULL;
 519         }
 520         if (!mmioInstallIOProcA(fccIOProc, (LPMMIOPROC)thunk, dwFlags))
 521         {
 522             thunk->pfn16 = NULL;
 523             pIOProc = NULL;
 524         }
 525         break;
 526     case MMIO_REMOVEPROC:
 527         if (MMIO_Thunks)
 528         {
 529             for (thunk = MMIO_Thunks; thunk < &MMIO_Thunks[MMIO_MAX_THUNKS]; thunk++)
 530             {
 531                 if (thunk->pfn16 == pIOProc && thunk->segbuffer == 0)
 532                 {
 533                     if (mmioInstallIOProcA(fccIOProc, (LPMMIOPROC)thunk, dwFlags))
 534                         thunk->pfn16 = NULL;
 535                     else
 536                         pIOProc = NULL;
 537                     break;
 538                 }
 539             }
 540         }
 541         if (!thunk) pIOProc = NULL;
 542         break;
 543     case MMIO_FINDPROC:
 544         if ((pIOProc32 = mmioInstallIOProcA(fccIOProc, NULL, dwFlags)) && MMIO_Thunks)
 545         {
 546             for (thunk = MMIO_Thunks; thunk < &MMIO_Thunks[MMIO_MAX_THUNKS]; thunk++)
 547             {
 548                 if ((LPMMIOPROC)thunk == pIOProc32)
 549                 {
 550                     pIOProc = thunk->pfn16;
 551                     break;
 552                 }
 553             }
 554         }
 555         break;
 556     default:
 557         FIXME("Unsupported flags %08x\n", dwFlags);
 558         pIOProc = NULL;
 559     }
 560     LeaveCriticalSection(&mmio_cs);
 561
 562     return pIOProc;
 563 }
 564
 565 /**************************************************************************
 566  *                              mmioSendMessage [MMSYSTEM.1222]
 567  */
 568 LRESULT WINAPI mmioSendMessage16(HMMIO16 hmmio, UINT16 uMessage,
 569                                  LPARAM lParam1, LPARAM lParam2)
 570 {
 571     struct mmio_thunk*  thunk;
 572
 573     if ((thunk = MMIO_HasThunk(HMMIO_32(hmmio))))
 574     {
 575         MMIOINFO        mmioinfo;
 576         if (mmioGetInfo(HMMIO_32(hmmio), &mmioinfo, 0) == MMSYSERR_NOERROR)
 577         {
 578             return MMIO_Callback3216((SEGPTR)thunk->pfn16, &mmioinfo, uMessage, lParam1, lParam2);
 579         }
 580         return MMSYSERR_INVALHANDLE;
 581     }
 582     else
 583     {
 584         /* FIXME: we need to map lParam1 and lParam2 to 32bit entities */
 585         return mmioSendMessage(HMMIO_32(hmmio), uMessage, lParam1, lParam2);
 586     }
 587 }
 588
 589 /**************************************************************************
 590  *                              mmioDescend             [MMSYSTEM.1223]
 591  */
 592 MMRESULT16 WINAPI mmioDescend16(HMMIO16 hmmio, LPMMCKINFO lpck,
 593                                 const MMCKINFO* lpckParent, UINT16 uFlags)
 594 {
 595     return mmioDescend(HMMIO_32(hmmio), lpck, lpckParent, uFlags);
 596 }
 597
 598 /**************************************************************************
 599  *                              mmioAscend              [MMSYSTEM.1224]
 600  */
 601 MMRESULT16 WINAPI mmioAscend16(HMMIO16 hmmio, MMCKINFO* lpck, UINT16 uFlags)
 602 {
 603     return mmioAscend(HMMIO_32(hmmio),lpck,uFlags);
 604 }
 605
 606 /**************************************************************************
 607  *                              mmioCreateChunk         [MMSYSTEM.1225]
 608  */
 609 MMRESULT16 WINAPI mmioCreateChunk16(HMMIO16 hmmio, MMCKINFO* lpck, UINT16 uFlags)
 610 {
 611     return mmioCreateChunk(HMMIO_32(hmmio), lpck, uFlags);
 612 }
 613
 614 /**************************************************************************
 615  *                              mmioRename              [MMSYSTEM.1226]
 616  */
 617 MMRESULT16 WINAPI mmioRename16(LPCSTR szFileName, LPCSTR szNewFileName,
 618                                MMIOINFO16* lpmmioinfo, DWORD dwRenameFlags)
 619 {
 620     BOOL        inst = FALSE;
 621     MMRESULT    ret;
 622     MMIOINFO    mmioinfo;
 623
 624     if (lpmmioinfo != NULL && lpmmioinfo->pIOProc != NULL &&
 625         lpmmioinfo->fccIOProc == 0) {
 626         FIXME("Can't handle this case yet\n");
 627         return MMSYSERR_ERROR;
 628     }
 629
 630     /* this is a bit hacky, but it'll work if we get a fourCC code or nothing.
 631      * but a non installed ioproc without a fourcc won't do
 632      */
 633     if (lpmmioinfo && lpmmioinfo->fccIOProc && lpmmioinfo->pIOProc) {
 634         mmioInstallIOProc16(lpmmioinfo->fccIOProc, lpmmioinfo->pIOProc,
 635                            MMIO_INSTALLPROC);
 636         inst = TRUE;
 637     }
 638     memset(&mmioinfo, 0, sizeof(mmioinfo));
 639     if (lpmmioinfo)
 640         mmioinfo.fccIOProc = lpmmioinfo->fccIOProc;
 641     ret = mmioRenameA(szFileName, szNewFileName, &mmioinfo, dwRenameFlags);
 642     if (inst) {
 643         mmioInstallIOProc16(lpmmioinfo->fccIOProc, NULL, MMIO_REMOVEPROC);
 644     }
 645     return ret;
 646 }