dlls/winmm/mmio.c

   1 /*
   2  * MMIO functions
   3  *
   4  * Copyright 1998 Andrew Taylor
   5  * Copyright 1998 Ove Kåven
   6  * Copyright 2000,2002 Eric Pouech
   7  *
   8  * This library is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * This library is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with this library; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  21  */
  22
  23 /* Still to be done:
  24  *      + correct handling of global/local IOProcs (and temporary IOProcs)
  25  *      + mode of mmio objects is not used (read vs write vs readwrite)
  26  *      + thread safeness
  27  *      + 32 A <=> W message mapping
  28  */
  29
  30
  31 #include <ctype.h>
  32 #include <stdarg.h>
  33 #include <stdlib.h>
  34 #include <string.h>
  35 #include <errno.h>
  36 #include <assert.h>
  37
  38 #include "windef.h"
  39 #include "winbase.h"
  40 #include "winnls.h"
  41 #include "mmsystem.h"
  42 #include "winemm.h"
  43
  44 #include "wine/debug.h"
  45
  46 WINE_DEFAULT_DEBUG_CHANNEL(mmio);
  47
  48 LRESULT         (*pFnMmioCallback16)(DWORD,LPMMIOINFO,UINT,LPARAM,LPARAM) /* = NULL */;
  49
  50 static WINE_MMIO *MMIOList;
  51
  52 /**************************************************************************
  53  *                      mmioDosIOProc                           [internal]
  54  */
  55 static LRESULT CALLBACK mmioDosIOProc(LPMMIOINFO lpmmioinfo, UINT uMessage,
  56                                       LPARAM lParam1, LPARAM lParam2)
  57 {
  58     LRESULT     ret = MMSYSERR_NOERROR;
  59
  60     TRACE("(%p, %X, 0x%lx, 0x%lx);\n", lpmmioinfo, uMessage, lParam1, lParam2);
  61
  62     switch (uMessage) {
  63     case MMIOM_OPEN:
  64         {
  65             /* Parameters:
  66              * lParam1 = szFileName parameter from mmioOpen
  67              * lParam2 = reserved
  68              * Returns: zero on success, error code on error
  69              * NOTE: lDiskOffset automatically set to zero
  70              */
  71             LPCSTR      szFileName = (LPCSTR)lParam1;
  72
  73             if (lpmmioinfo->dwFlags & MMIO_GETTEMP) {
  74                 FIXME("MMIO_GETTEMP not implemented\n");
  75                 return MMIOERR_CANNOTOPEN;
  76             }
  77
  78             /* if filename NULL, assume open file handle in adwInfo[0] */
  79             if (szFileName) {
  80                 OFSTRUCT    ofs;
  81                 lpmmioinfo->adwInfo[0] = (DWORD)OpenFile(szFileName, &ofs, lpmmioinfo->dwFlags & 0xFFFF);
  82             }
  83             if (lpmmioinfo->adwInfo[0] == (DWORD)HFILE_ERROR)
  84                 ret = MMIOERR_CANNOTOPEN;
  85         }
  86         break;
  87
  88     case MMIOM_CLOSE:
  89         /* Parameters:
  90          * lParam1 = wFlags parameter from mmioClose
  91          * lParam2 = unused
  92          * Returns: zero on success, error code on error
  93          */
  94         if (!(lParam1 & MMIO_FHOPEN))
  95             _lclose((HFILE)lpmmioinfo->adwInfo[0]);
  96         break;
  97
  98     case MMIOM_READ:
  99         /* Parameters:
 100          * lParam1 = huge pointer to read buffer
 101          * lParam2 = number of bytes to read
 102          * Returns: number of bytes read, 0 for EOF, -1 for error (error code
 103          *         in wErrorRet)
 104          */
 105         ret = _lread((HFILE)lpmmioinfo->adwInfo[0], (HPSTR)lParam1, (LONG)lParam2);
 106         if (ret != -1)
 107             lpmmioinfo->lDiskOffset += ret;
 108
 109         break;
 110
 111     case MMIOM_WRITE:
 112     case MMIOM_WRITEFLUSH:
 113         /* no internal buffering, so WRITEFLUSH handled same as WRITE */
 114
 115         /* Parameters:
 116          * lParam1 = huge pointer to write buffer
 117          * lParam2 = number of bytes to write
 118          * Returns: number of bytes written, -1 for error (error code in
 119          *              wErrorRet)
 120          */
 121         ret = _hwrite((HFILE)lpmmioinfo->adwInfo[0], (HPSTR)lParam1, (LONG)lParam2);
 122         if (ret != -1)
 123             lpmmioinfo->lDiskOffset += ret;
 124         break;
 125
 126     case MMIOM_SEEK:
 127         /* Parameters:
 128          * lParam1 = new position
 129          * lParam2 = from whence to seek (SEEK_SET, SEEK_CUR, SEEK_END)
 130          * Returns: new file postion, -1 on error
 131          */
 132         ret = _llseek((HFILE)lpmmioinfo->adwInfo[0], (LONG)lParam1, (LONG)lParam2);
 133         if (ret != -1)
 134             lpmmioinfo->lDiskOffset = ret;
 135         return ret;
 136
 137     case MMIOM_RENAME:
 138         /* Parameters:
 139          * lParam1 = old name
 140          * lParam2 = new name
 141          * Returns: zero on success, non-zero on failure
 142          */
 143          if (!MoveFileA((const char*)lParam1, (const char*)lParam2))
 144              ret = MMIOERR_FILENOTFOUND;
 145          break;
 146
 147     default:
 148         FIXME("unexpected message %u\n", uMessage);
 149         return 0;
 150     }
 151
 152     return ret;
 153 }
 154
 155 /**************************************************************************
 156  *                      mmioMemIOProc                           [internal]
 157  */
 158 static LRESULT CALLBACK mmioMemIOProc(LPMMIOINFO lpmmioinfo, UINT uMessage,
 159                                       LPARAM lParam1, LPARAM lParam2)
 160 {
 161     TRACE("(%p,0x%04x,0x%08lx,0x%08lx)\n", lpmmioinfo, uMessage, lParam1, lParam2);
 162
 163     switch (uMessage) {
 164
 165     case MMIOM_OPEN:
 166         /* Parameters:
 167          * lParam1 = filename (must be NULL)
 168          * lParam2 = reserved
 169          * Returns: zero on success, error code on error
 170          * NOTE: lDiskOffset automatically set to zero
 171          */
 172         /* FIXME: io proc shouldn't change it */
 173         if (!(lpmmioinfo->dwFlags & MMIO_CREATE))
 174             lpmmioinfo->pchEndRead = lpmmioinfo->pchEndWrite;
 175         lpmmioinfo->adwInfo[0] = HFILE_ERROR;
 176         return 0;
 177
 178     case MMIOM_CLOSE:
 179         /* Parameters:
 180          * lParam1 = wFlags parameter from mmioClose
 181          * lParam2 = unused
 182          * Returns: zero on success, error code on error
 183          */
 184         return 0;
 185
 186     case MMIOM_READ:
 187         /* Parameters:
 188          * lParam1 = huge pointer to read buffer
 189          * lParam2 = number of bytes to read
 190          * Returns: number of bytes read, 0 for EOF, -1 for error (error code
 191          *         in wErrorRet)
 192          * NOTE: lDiskOffset should be updated
 193          */
 194         FIXME("MMIOM_READ on memory files should not occur, buffer may be lost!\n");
 195         return 0;
 196
 197     case MMIOM_WRITE:
 198     case MMIOM_WRITEFLUSH:
 199         /* no internal buffering, so WRITEFLUSH handled same as WRITE */
 200
 201         /* Parameters:
 202          * lParam1 = huge pointer to write buffer
 203          * lParam2 = number of bytes to write
 204          * Returns: number of bytes written, -1 for error (error code in
 205          *              wErrorRet)
 206          * NOTE: lDiskOffset should be updated
 207          */
 208         FIXME("MMIOM_WRITE on memory files should not occur, buffer may be lost!\n");
 209         return 0;
 210
 211     case MMIOM_SEEK:
 212         /* Parameters:
 213          * lParam1 = new position
 214          * lParam2 = from whence to seek (SEEK_SET, SEEK_CUR, SEEK_END)
 215          * Returns: new file postion, -1 on error
 216          * NOTE: lDiskOffset should be updated
 217          */
 218         FIXME("MMIOM_SEEK on memory files should not occur, buffer may be lost!\n");
 219         return -1;
 220
 221     default:
 222         FIXME("unexpected message %u\n", uMessage);
 223         return 0;
 224     }
 225 }
 226
 227 /* This array will be the entire list for most apps
 228  * Note that temporary ioProcs will be stored with a 0 fourCC code
 229  */
 230
 231 static struct IOProcList defaultProcs[] = {
 232     {&defaultProcs[1], FOURCC_DOS, (LPMMIOPROC)mmioDosIOProc, MMIO_PROC_32A, 0},
 233     {NULL,             FOURCC_MEM, (LPMMIOPROC)mmioMemIOProc, MMIO_PROC_32A, 0},
 234 };
 235
 236 static struct IOProcList*       pIOProcListAnchor = &defaultProcs[0];
 237
 238 /****************************************************************
 239  *              MMIO_FindProcNode                       [INTERNAL]
 240  *
 241  * Finds the ProcList node associated with a given FOURCC code.
 242  */
 243 static struct IOProcList*       MMIO_FindProcNode(FOURCC fccIOProc)
 244 {
 245     struct IOProcList*  pListNode;
 246
 247     for (pListNode = pIOProcListAnchor; pListNode; pListNode = pListNode->pNext) {
 248         if (pListNode->fourCC == fccIOProc) {
 249             return pListNode;
 250         }
 251     }
 252     return NULL;
 253 }
 254
 255 /****************************************************************
 256  *              MMIO_InstallIOProc                      [INTERNAL]
 257  */
 258 LPMMIOPROC MMIO_InstallIOProc(FOURCC fccIOProc, LPMMIOPROC pIOProc,
 259                               DWORD dwFlags, enum mmioProcType type)
 260 {
 261     LPMMIOPROC          lpProc = NULL;
 262     struct IOProcList*  pListNode;
 263     struct IOProcList** ppListNode;
 264
 265     TRACE("(%08x, %p, %08X, %i)\n", fccIOProc, pIOProc, dwFlags, type);
 266
 267     if (dwFlags & MMIO_GLOBALPROC)
 268         FIXME("Global procedures not implemented\n");
 269
 270     /* just handle the known procedures for now */
 271     switch (dwFlags & (MMIO_INSTALLPROC|MMIO_REMOVEPROC|MMIO_FINDPROC)) {
 272     case MMIO_INSTALLPROC:
 273         /* Create new entry for the IOProc list */
 274         pListNode = HeapAlloc(GetProcessHeap(), 0, sizeof(*pListNode));
 275         if (pListNode) {
 276             /* Fill in this node */
 277             pListNode->fourCC = fccIOProc;
 278             pListNode->pIOProc = pIOProc;
 279             pListNode->type = type;
 280             pListNode->count = 0;
 281
 282             /* Stick it on the end of the list */
 283             pListNode->pNext = pIOProcListAnchor;
 284             pIOProcListAnchor = pListNode;
 285
 286             /* Return this IOProc - that's how the caller knows we succeeded */
 287             lpProc = pIOProc;
 288         }
 289         break;
 290
 291     case MMIO_REMOVEPROC:
 292         /*
 293          * Search for the node that we're trying to remove
 294          * We search for a matching fourCC code if it's non null, or the proc
 295          * address otherwise
 296          * note that this method won't find the first item on the list, but
 297          * since the first two items on this list are ones we won't
 298          * let the user delete anyway, that's okay
 299          */
 300         ppListNode = &pIOProcListAnchor;
 301         while ((*ppListNode) &&
 302                ((fccIOProc != 0) ?
 303                 (*ppListNode)->fourCC != fccIOProc :
 304                 (*ppListNode)->pIOProc != pIOProc))
 305             ppListNode = &((*ppListNode)->pNext);
 306
 307         if (*ppListNode) { /* found it */
 308             /* FIXME: what should be done if an open mmio object uses this proc ?
 309              * shall we return an error, nuke the mmio object ?
 310              */
 311             if ((*ppListNode)->count) {
 312                 ERR("Cannot remove a mmIOProc while in use\n");
 313                 break;
 314             }
 315             /* remove it, but only if it isn't builtin */
 316             if ((*ppListNode) >= defaultProcs &&
 317                 (*ppListNode) < defaultProcs + sizeof(defaultProcs)) {
 318                 WARN("Tried to remove built-in mmio proc. Skipping\n");
 319             } else {
 320                 /* Okay, nuke it */
 321                 struct IOProcList*  ptmpNode = *ppListNode;
 322                 lpProc = (*ppListNode)->pIOProc;
 323                 *ppListNode = (*ppListNode)->pNext;
 324                 HeapFree(GetProcessHeap(), 0, ptmpNode);
 325             }
 326         }
 327         break;
 328
 329     case MMIO_FINDPROC:
 330         if ((pListNode = MMIO_FindProcNode(fccIOProc))) {
 331             lpProc = pListNode->pIOProc;
 332         }
 333         break;
 334     }
 335
 336     return lpProc;
 337 }
 338
 339 /****************************************************************
 340  *              send_message                            [INTERNAL]
 341  */
 342 static LRESULT  send_message(struct IOProcList* ioProc, LPMMIOINFO mmioinfo,
 343                              DWORD wMsg, LPARAM lParam1,
 344                              LPARAM lParam2, enum mmioProcType type)
 345 {
 346     LRESULT             result = MMSYSERR_ERROR;
 347     LPARAM              lp1 = lParam1, lp2 = lParam2;
 348
 349     if (!ioProc) {
 350         ERR("brrr\n");
 351         result = MMSYSERR_INVALPARAM;
 352     }
 353
 354     switch (ioProc->type) {
 355     case MMIO_PROC_16:
 356         if (pFnMmioCallback16)
 357             result = pFnMmioCallback16((DWORD)ioProc->pIOProc,
 358                                        mmioinfo, wMsg, lp1, lp2);
 359         break;
 360     case MMIO_PROC_32A:
 361     case MMIO_PROC_32W:
 362         if (ioProc->type != type) {
 363             /* map (lParam1, lParam2) into (lp1, lp2) 32 A<=>W */
 364             FIXME("NIY 32 A<=>W mapping\n");
 365         }
 366         result = (ioProc->pIOProc)((LPSTR)mmioinfo, wMsg, lp1, lp2);
 367
 368 #if 0
 369         if (ioProc->type != type) {
 370             /* unmap (lParam1, lParam2) into (lp1, lp2) 32 A<=>W */
 371         }
 372 #endif
 373         break;
 374     default:
 375         FIXME("Internal error\n");
 376     }
 377
 378     return result;
 379 }
 380
 381 /**************************************************************************
 382  *                              MMIO_ParseExtA                  [internal]
 383  *
 384  * Parses a filename for the extension.
 385  *
 386  * RETURNS
 387  *  The FOURCC code for the extension if found, else 0.
 388  */
 389 static FOURCC MMIO_ParseExtA(LPCSTR szFileName)
 390 {
 391     /* Filenames are of the form file.ext{+ABC}
 392        For now, we take the last '+' if present */
 393
 394     FOURCC ret = 0;
 395
 396     /* Note that ext{Start,End} point to the . and + respectively */
 397     LPSTR extEnd;
 398     LPSTR extStart;
 399
 400     TRACE("(%s)\n", debugstr_a(szFileName));
 401
 402     if (!szFileName)
 403         return ret;
 404
 405     /* Find the last '.' */
 406     extStart = strrchr(szFileName,'.');
 407
 408     if (!extStart) {
 409          ERR("No . in szFileName: %s\n", debugstr_a(szFileName));
 410     } else {
 411         CHAR ext[5];
 412
 413         /* Find the '+' afterwards */
 414         extEnd = strchr(extStart,'+');
 415         if (extEnd) {
 416
 417             if (extEnd - extStart - 1 > 4)
 418                 WARN("Extension length > 4\n");
 419             lstrcpynA(ext, extStart + 1, min(extEnd-extStart,5));
 420
 421         } else {
 422             /* No + so just an extension */
 423             if (strlen(extStart) > 4) {
 424                 WARN("Extension length > 4\n");
 425             }
 426             lstrcpynA(ext, extStart + 1, 5);
 427         }
 428         TRACE("Got extension: %s\n", debugstr_a(ext));
 429
 430         /* FOURCC codes identifying file-extensions must be uppercase */
 431         ret = mmioStringToFOURCCA(ext, MMIO_TOUPPER);
 432     }
 433     return ret;
 434 }
 435
 436 /**************************************************************************
 437  *                              MMIO_Get                        [internal]
 438  *
 439  * Retrieves the mmio object from current process
 440  */
 441 LPWINE_MMIO     MMIO_Get(HMMIO h)
 442 {
 443     LPWINE_MMIO         wm = NULL;
 444
 445     EnterCriticalSection(&WINMM_cs);
 446     for (wm = MMIOList; wm; wm = wm->lpNext) {
 447         if (wm->info.hmmio == h)
 448             break;
 449     }
 450     LeaveCriticalSection(&WINMM_cs);
 451     return wm;
 452 }
 453
 454 /**************************************************************************
 455  *                              MMIO_Create                     [internal]
 456  *
 457  * Creates an internal representation for a mmio instance
 458  */
 459 static  LPWINE_MMIO             MMIO_Create(void)
 460 {
 461     static      WORD    MMIO_counter = 0;
 462     LPWINE_MMIO         wm;
 463
 464     wm = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(WINE_MMIO));
 465     if (wm) {
 466         EnterCriticalSection(&WINMM_cs);
 467         /* lookup next unallocated WORD handle, with a non NULL value */
 468         while (++MMIO_counter == 0 || MMIO_Get((HMMIO)(ULONG_PTR)MMIO_counter));
 469         wm->info.hmmio = (HMMIO)(ULONG_PTR)MMIO_counter;
 470         wm->lpNext = MMIOList;
 471         MMIOList = wm;
 472         LeaveCriticalSection(&WINMM_cs);
 473     }
 474     return wm;
 475 }
 476
 477 /**************************************************************************
 478  *                              MMIO_Destroy                    [internal]
 479  *-
 480  * Destroys an internal representation for a mmio instance
 481  */
 482 static  BOOL            MMIO_Destroy(LPWINE_MMIO wm)
 483 {
 484     LPWINE_MMIO*        m;
 485
 486     EnterCriticalSection(&WINMM_cs);
 487     /* search for the matching one... */
 488     m = &MMIOList;
 489     while (*m && *m != wm) m = &(*m)->lpNext;
 490     /* ...and destroy */
 491     if (*m) {
 492         *m = (*m)->lpNext;
 493         HeapFree(GetProcessHeap(), 0, wm);
 494         wm = NULL;
 495     }
 496     LeaveCriticalSection(&WINMM_cs);
 497     return wm ? FALSE : TRUE;
 498 }
 499
 500 /****************************************************************
 501  *                      MMIO_Flush                      [INTERNAL]
 502  */
 503 static  MMRESULT MMIO_Flush(WINE_MMIO* wm, UINT uFlags)
 504 {
 505     if (wm->info.cchBuffer && (wm->info.fccIOProc != FOURCC_MEM)) {
 506         /* not quite sure what to do here, but I'll guess */
 507         if (wm->info.dwFlags & MMIO_DIRTY) {
 508             /* FIXME: error handling */
 509             send_message(wm->ioProc, &wm->info, MMIOM_SEEK,
 510                          wm->info.lBufOffset, SEEK_SET, MMIO_PROC_32A);
 511             send_message(wm->ioProc, &wm->info, MMIOM_WRITE,
 512                          (LPARAM)wm->info.pchBuffer,
 513                          wm->info.pchNext - wm->info.pchBuffer, MMIO_PROC_32A);
 514         }
 515         if (uFlags & MMIO_EMPTYBUF)
 516             wm->info.pchNext = wm->info.pchEndRead = wm->info.pchBuffer;
 517     }
 518     wm->info.dwFlags &= ~MMIO_DIRTY;
 519
 520     return MMSYSERR_NOERROR;
 521 }
 522
 523 /***************************************************************************
 524  *                      MMIO_GrabNextBuffer                     [INTERNAL]
 525  */
 526 static LONG     MMIO_GrabNextBuffer(LPWINE_MMIO wm, int for_read)
 527 {
 528     LONG        size = wm->info.cchBuffer;
 529
 530     TRACE("bo=%x do=%x of=%lx\n",
 531           wm->info.lBufOffset, wm->info.lDiskOffset,
 532           send_message(wm->ioProc, &wm->info, MMIOM_SEEK, 0, SEEK_CUR, MMIO_PROC_32A));
 533
 534     wm->info.lBufOffset = wm->info.lDiskOffset;
 535     wm->info.pchNext = wm->info.pchBuffer;
 536     wm->info.pchEndRead = wm->info.pchBuffer;
 537     wm->info.pchEndWrite = wm->info.pchBuffer + wm->info.cchBuffer;
 538
 539     wm->bBufferLoaded = TRUE;
 540     if (for_read) {
 541         size = send_message(wm->ioProc, &wm->info, MMIOM_READ,
 542                             (LPARAM)wm->info.pchBuffer, size, MMIO_PROC_32A);
 543         if (size > 0)
 544             wm->info.pchEndRead += size;
 545         else
 546             wm->bBufferLoaded = FALSE;
 547     }
 548
 549     return size;
 550 }
 551
 552 /***************************************************************************
 553  *                      MMIO_SetBuffer                          [INTERNAL]
 554  */
 555 static MMRESULT MMIO_SetBuffer(WINE_MMIO* wm, void* pchBuffer, LONG cchBuffer,
 556                                UINT uFlags)
 557 {
 558     TRACE("(%p %p %d %u)\n", wm, pchBuffer, cchBuffer, uFlags);
 559
 560     if (uFlags)                 return MMSYSERR_INVALPARAM;
 561     if (cchBuffer > 0xFFFF)
 562         WARN("Untested handling of huge mmio buffers (%d >= 64k)\n", cchBuffer);
 563
 564     if (MMIO_Flush(wm, 0) != MMSYSERR_NOERROR)
 565         return MMIOERR_CANNOTWRITE;
 566
 567     /* free previous buffer if allocated */
 568     if (wm->info.dwFlags & MMIO_ALLOCBUF) {
 569         HeapFree(GetProcessHeap(), 0, wm->info.pchBuffer);
 570         wm->info.pchBuffer = NULL;
 571         wm->info.dwFlags &= ~MMIO_ALLOCBUF;
 572     }
 573
 574     if (pchBuffer) {
 575         wm->info.pchBuffer = pchBuffer;
 576     } else if (cchBuffer) {
 577         if (!(wm->info.pchBuffer = HeapAlloc(GetProcessHeap(), 0, cchBuffer)))
 578             return MMIOERR_OUTOFMEMORY;
 579         wm->info.dwFlags |= MMIO_ALLOCBUF;
 580     } else {
 581         wm->info.pchBuffer = NULL;
 582     }
 583
 584     wm->info.cchBuffer = cchBuffer;
 585     wm->info.pchNext = wm->info.pchBuffer;
 586     wm->info.pchEndRead = wm->info.pchBuffer;
 587     wm->info.pchEndWrite = wm->info.pchBuffer + cchBuffer;
 588     wm->info.lBufOffset = 0;
 589     wm->bBufferLoaded = FALSE;
 590
 591     return MMSYSERR_NOERROR;
 592 }
 593
 594 /**************************************************************************
 595  *                      MMIO_Open                               [internal]
 596  */
 597 HMMIO MMIO_Open(LPSTR szFileName, MMIOINFO* refmminfo, DWORD dwOpenFlags,
 598                 enum mmioProcType type)
 599 {
 600     LPWINE_MMIO         wm;
 601     MMIOINFO            mmioinfo;
 602
 603     TRACE("('%s', %p, %08X, %d);\n", szFileName, refmminfo, dwOpenFlags, type);
 604
 605     if (!refmminfo) {
 606         refmminfo = &mmioinfo;
 607
 608         mmioinfo.fccIOProc = 0;
 609         mmioinfo.pIOProc = NULL;
 610         mmioinfo.pchBuffer = NULL;
 611         mmioinfo.cchBuffer = 0;
 612         type = MMIO_PROC_32A;
 613     }
 614
 615     if (dwOpenFlags & (MMIO_PARSE|MMIO_EXIST)) {
 616         char    buffer[MAX_PATH];
 617
 618         if (GetFullPathNameA(szFileName, sizeof(buffer), buffer, NULL) >= sizeof(buffer))
 619             return (HMMIO)FALSE;
 620         if ((dwOpenFlags & MMIO_EXIST) && (GetFileAttributesA(buffer) == INVALID_FILE_ATTRIBUTES))
 621             return (HMMIO)FALSE;
 622         strcpy(szFileName, buffer);
 623         return (HMMIO)TRUE;
 624     }
 625
 626     if ((wm = MMIO_Create()) == NULL)
 627         return 0;
 628
 629     /* If both params are NULL, then parse the file name if available */
 630     if (refmminfo->fccIOProc == 0 && refmminfo->pIOProc == NULL) {
 631         wm->info.fccIOProc = MMIO_ParseExtA(szFileName);
 632         /* Handle any unhandled/error case. Assume DOS file */
 633         if (wm->info.fccIOProc == 0)
 634             wm->info.fccIOProc = FOURCC_DOS;
 635         if (!(wm->ioProc = MMIO_FindProcNode(wm->info.fccIOProc))) {
 636             /* If not found, retry with FOURCC_DOS */
 637             wm->info.fccIOProc = FOURCC_DOS;
 638             if (!(wm->ioProc = MMIO_FindProcNode(wm->info.fccIOProc)))
 639                 goto error2;
 640         }
 641         wm->bTmpIOProc = FALSE;
 642     }
 643     /* if just the four character code is present, look up IO proc */
 644     else if (refmminfo->pIOProc == NULL) {
 645         wm->info.fccIOProc = refmminfo->fccIOProc;
 646         if (!(wm->ioProc = MMIO_FindProcNode(wm->info.fccIOProc))) goto error2;
 647         wm->bTmpIOProc = FALSE;
 648     }
 649     /* if IO proc specified, use it and specified four character code */
 650     else {
 651         wm->info.fccIOProc = refmminfo->fccIOProc;
 652         MMIO_InstallIOProc(wm->info.fccIOProc, refmminfo->pIOProc,
 653                            MMIO_INSTALLPROC, type);
 654         if (!(wm->ioProc = MMIO_FindProcNode(wm->info.fccIOProc))) goto error2;
 655         assert(wm->ioProc->pIOProc == refmminfo->pIOProc);
 656         wm->bTmpIOProc = TRUE;
 657     }
 658
 659     wm->bBufferLoaded = FALSE;
 660     wm->ioProc->count++;
 661
 662     if (dwOpenFlags & MMIO_ALLOCBUF) {
 663         if ((refmminfo->wErrorRet = MMIO_SetBuffer(wm, NULL, MMIO_DEFAULTBUFFER, 0)))
 664             goto error1;
 665     } else if (wm->info.fccIOProc == FOURCC_MEM) {
 666         refmminfo->wErrorRet = MMIO_SetBuffer(wm, refmminfo->pchBuffer, refmminfo->cchBuffer, 0);
 667         if (refmminfo->wErrorRet != MMSYSERR_NOERROR)
 668             goto error1;
 669         wm->bBufferLoaded = TRUE;
 670     } /* else => unbuffered, wm->info.pchBuffer == NULL */
 671
 672     /* see mmioDosIOProc for that one */
 673     wm->info.adwInfo[0] = refmminfo->adwInfo[0];
 674     wm->info.dwFlags = dwOpenFlags;
 675
 676     /* call IO proc to actually open file */
 677     refmminfo->wErrorRet = send_message(wm->ioProc, &wm->info, MMIOM_OPEN,
 678                                         (LPARAM)szFileName, 0, MMIO_PROC_32A);
 679
 680     /* grab file size, when possible */
 681     wm->dwFileSize = GetFileSize((HANDLE)wm->info.adwInfo[0], NULL);
 682
 683     if (refmminfo->wErrorRet == 0)
 684         return wm->info.hmmio;
 685  error1:
 686     if (wm->ioProc) wm->ioProc->count--;
 687  error2:
 688     MMIO_Destroy(wm);
 689     return 0;
 690 }
 691
 692 /**************************************************************************
 693  *                              mmioOpenW                       [WINMM.@]
 694  */
 695 HMMIO WINAPI mmioOpenW(LPWSTR szFileName, MMIOINFO* lpmmioinfo,
 696                        DWORD dwOpenFlags)
 697 {
 698     HMMIO       ret;
 699     LPSTR       szFn = NULL;
 700
 701     if (szFileName)
 702     {
 703         INT     len = WideCharToMultiByte( CP_ACP, 0, szFileName, -1, NULL, 0, NULL, NULL );
 704         szFn = HeapAlloc( GetProcessHeap(), 0, len );
 705         if (!szFn) return NULL;
 706         WideCharToMultiByte( CP_ACP, 0, szFileName, -1, szFn, len, NULL, NULL );
 707     }
 708
 709     ret = MMIO_Open(szFn, lpmmioinfo, dwOpenFlags, MMIO_PROC_32W);
 710
 711     HeapFree(GetProcessHeap(), 0, szFn);
 712     return ret;
 713 }
 714
 715 /**************************************************************************
 716  *                              mmioOpenA                       [WINMM.@]
 717  */
 718 HMMIO WINAPI mmioOpenA(LPSTR szFileName, MMIOINFO* lpmmioinfo,
 719                        DWORD dwOpenFlags)
 720 {
 721     return  MMIO_Open(szFileName, lpmmioinfo, dwOpenFlags, MMIO_PROC_32A);
 722 }
 723
 724 /**************************************************************************
 725  *                              mmioClose               [WINMM.@]
 726  */
 727 MMRESULT WINAPI mmioClose(HMMIO hmmio, UINT uFlags)
 728 {
 729     LPWINE_MMIO wm;
 730     MMRESULT    result;
 731
 732     TRACE("(%p, %04X);\n", hmmio, uFlags);
 733
 734     if ((wm = MMIO_Get(hmmio)) == NULL)
 735         return MMSYSERR_INVALHANDLE;
 736
 737     if ((result = MMIO_Flush(wm, 0)) != MMSYSERR_NOERROR)
 738         return result;
 739
 740     result = send_message(wm->ioProc, &wm->info, MMIOM_CLOSE,
 741                           uFlags, 0, MMIO_PROC_32A);
 742
 743     MMIO_SetBuffer(wm, NULL, 0, 0);
 744
 745     wm->ioProc->count--;
 746
 747     if (wm->bTmpIOProc)
 748         MMIO_InstallIOProc(wm->info.fccIOProc, wm->ioProc->pIOProc,
 749                            MMIO_REMOVEPROC, wm->ioProc->type);
 750
 751     MMIO_Destroy(wm);
 752
 753     return result;
 754 }
 755
 756 /**************************************************************************
 757  *                              mmioRead                [WINMM.@]
 758  */
 759 LONG WINAPI mmioRead(HMMIO hmmio, HPSTR pch, LONG cch)
 760 {
 761     LPWINE_MMIO wm;
 762     LONG        count;
 763
 764     TRACE("(%p, %p, %d);\n", hmmio, pch, cch);
 765
 766     if ((wm = MMIO_Get(hmmio)) == NULL)
 767         return -1;
 768
 769     /* unbuffered case first */
 770     if (!wm->info.pchBuffer)
 771         return send_message(wm->ioProc, &wm->info, MMIOM_READ,
 772                             (LPARAM)pch, cch, MMIO_PROC_32A);
 773
 774     /* first try from current buffer */
 775     if (wm->info.pchNext != wm->info.pchEndRead) {
 776         count = wm->info.pchEndRead - wm->info.pchNext;
 777         if (count > cch || count < 0) count = cch;
 778         memcpy(pch, wm->info.pchNext, count);
 779         wm->info.pchNext += count;
 780         pch += count;
 781         cch -= count;
 782     } else
 783         count = 0;
 784
 785     if (cch && (wm->info.fccIOProc != FOURCC_MEM)) {
 786         assert(wm->info.cchBuffer);
 787
 788         while (cch) {
 789             LONG size;
 790
 791             size = MMIO_GrabNextBuffer(wm, TRUE);
 792             if (size <= 0) break;
 793             if (size > cch) size = cch;
 794             memcpy(pch, wm->info.pchBuffer, size);
 795             wm->info.pchNext += size;
 796             pch += size;
 797             cch -= size;
 798             count += size;
 799         }
 800     }
 801
 802     TRACE("count=%d\n", count);
 803     return count;
 804 }
 805
 806 /**************************************************************************
 807  *                              mmioWrite               [WINMM.@]
 808  */
 809 LONG WINAPI mmioWrite(HMMIO hmmio, HPCSTR pch, LONG cch)
 810 {
 811     LPWINE_MMIO wm;
 812     LONG        count;
 813
 814     TRACE("(%p, %p, %d);\n", hmmio, pch, cch);
 815
 816     if ((wm = MMIO_Get(hmmio)) == NULL)
 817         return -1;
 818
 819     if (wm->info.cchBuffer) {
 820         LONG    bytesW = 0;
 821
 822         count = 0;
 823         while (cch) {
 824             if (wm->info.pchNext != wm->info.pchEndWrite) {
 825                 count = wm->info.pchEndWrite - wm->info.pchNext;
 826                 if (count > cch || count < 0) count = cch;
 827                 memcpy(wm->info.pchNext, pch, count);
 828                 wm->info.pchNext += count;
 829                 pch += count;
 830                 cch -= count;
 831                 bytesW += count;
 832                 wm->info.dwFlags |= MMIO_DIRTY;
 833             } else {
 834                 if (wm->info.fccIOProc == FOURCC_MEM) {
 835                     if (wm->info.adwInfo[0]) {
 836                         /* from where would we get the memory handle? */
 837                         FIXME("memory file expansion not implemented!\n");
 838                         break;
 839                     } else break;
 840                 }
 841             }
 842
 843             if (wm->info.pchNext == wm->info.pchEndWrite)
 844             {
 845                 MMIO_Flush(wm, MMIO_EMPTYBUF);
 846                 MMIO_GrabNextBuffer(wm, FALSE);
 847             }
 848             else break;
 849         }
 850         count = bytesW;
 851     } else {
 852         count = send_message(wm->ioProc, &wm->info, MMIOM_WRITE,
 853                              (LPARAM)pch, cch, MMIO_PROC_32A);
 854         wm->info.lBufOffset = wm->info.lDiskOffset;
 855     }
 856
 857     TRACE("bytes written=%d\n", count);
 858     return count;
 859 }
 860
 861 /**************************************************************************
 862  *                              mmioSeek                [WINMM.@]
 863  */
 864 LONG WINAPI mmioSeek(HMMIO hmmio, LONG lOffset, INT iOrigin)
 865 {
 866     LPWINE_MMIO wm;
 867     LONG        offset;
 868
 869     TRACE("(%p, %08X, %d);\n", hmmio, lOffset, iOrigin);
 870
 871     if ((wm = MMIO_Get(hmmio)) == NULL)
 872         return MMSYSERR_INVALHANDLE;
 873
 874     /* not buffered, direct seek on file */
 875     if (!wm->info.pchBuffer)
 876         return send_message(wm->ioProc, &wm->info, MMIOM_SEEK,
 877                             lOffset, iOrigin, MMIO_PROC_32A);
 878
 879     switch (iOrigin) {
 880     case SEEK_SET:
 881         offset = lOffset;
 882         break;
 883     case SEEK_CUR:
 884         offset = wm->info.lBufOffset + (wm->info.pchNext - wm->info.pchBuffer) + lOffset;
 885         break;
 886     case SEEK_END:
 887         offset = ((wm->info.fccIOProc == FOURCC_MEM)? wm->info.cchBuffer : wm->dwFileSize) - lOffset;
 888         break;
 889     default:
 890         return -1;
 891     }
 892
 893     if (offset && offset >= wm->dwFileSize && wm->info.fccIOProc != FOURCC_MEM) {
 894         /* should check that write mode exists */
 895         if (MMIO_Flush(wm, 0) != MMSYSERR_NOERROR)
 896             return -1;
 897         wm->info.lBufOffset = offset;
 898         wm->info.pchEndRead = wm->info.pchBuffer;
 899         wm->info.pchEndWrite = wm->info.pchBuffer + wm->info.cchBuffer;
 900         if ((wm->info.dwFlags & MMIO_RWMODE) == MMIO_READ) {
 901             wm->info.lDiskOffset = wm->dwFileSize;
 902         }
 903     } else if ((wm->info.cchBuffer > 0) &&
 904         ((offset < wm->info.lBufOffset) ||
 905          (offset >= wm->info.lBufOffset + wm->info.cchBuffer) ||
 906          !wm->bBufferLoaded)) {
 907         /* stay in same buffer ? */
 908         /* some memory mapped buffers are defined with -1 as a size */
 909
 910         /* condition to change buffer */
 911         if ((wm->info.fccIOProc == FOURCC_MEM) ||
 912             MMIO_Flush(wm, 0) != MMSYSERR_NOERROR ||
 913             /* this also sets the wm->info.lDiskOffset field */
 914             send_message(wm->ioProc, &wm->info, MMIOM_SEEK,
 915                          (offset / wm->info.cchBuffer) * wm->info.cchBuffer,
 916                          SEEK_SET, MMIO_PROC_32A) == -1)
 917             return -1;
 918         MMIO_GrabNextBuffer(wm, TRUE);
 919     }
 920
 921     wm->info.pchNext = wm->info.pchBuffer + (offset - wm->info.lBufOffset);
 922
 923     TRACE("=> %d\n", offset);
 924     return offset;
 925 }
 926
 927 /**************************************************************************
 928  *                              mmioGetInfo             [WINMM.@]
 929  */
 930 MMRESULT WINAPI mmioGetInfo(HMMIO hmmio, MMIOINFO* lpmmioinfo, UINT uFlags)
 931 {
 932     LPWINE_MMIO         wm;
 933
 934     TRACE("(%p,%p,0x%08x)\n",hmmio,lpmmioinfo,uFlags);
 935
 936     if ((wm = MMIO_Get(hmmio)) == NULL)
 937         return MMSYSERR_INVALHANDLE;
 938
 939     *lpmmioinfo = wm->info;
 940     /* don't expose 16 bit ioproc:s */
 941     if (wm->ioProc->type != MMIO_PROC_16)
 942         lpmmioinfo->pIOProc = wm->ioProc->pIOProc;
 943
 944     return MMSYSERR_NOERROR;
 945 }
 946
 947 /**************************************************************************
 948  *                              mmioSetInfo             [WINMM.@]
 949  */
 950 MMRESULT WINAPI mmioSetInfo(HMMIO hmmio, const MMIOINFO* lpmmioinfo, UINT uFlags)
 951 {
 952     LPWINE_MMIO         wm;
 953
 954     TRACE("(%p,%p,0x%08x)\n",hmmio,lpmmioinfo,uFlags);
 955
 956     if ((wm = MMIO_Get(hmmio)) == NULL)
 957         return MMSYSERR_INVALHANDLE;
 958
 959     /* check pointers coherence */
 960     if (lpmmioinfo->pchNext < wm->info.pchBuffer ||
 961         lpmmioinfo->pchNext > wm->info.pchBuffer + wm->info.cchBuffer ||
 962         lpmmioinfo->pchEndRead < wm->info.pchBuffer ||
 963         lpmmioinfo->pchEndRead > wm->info.pchBuffer + wm->info.cchBuffer ||
 964         lpmmioinfo->pchEndWrite < wm->info.pchBuffer ||
 965         lpmmioinfo->pchEndWrite > wm->info.pchBuffer + wm->info.cchBuffer)
 966         return MMSYSERR_INVALPARAM;
 967
 968     wm->info.pchNext = lpmmioinfo->pchNext;
 969     wm->info.pchEndRead = lpmmioinfo->pchEndRead;
 970
 971     return MMSYSERR_NOERROR;
 972 }
 973
 974 /**************************************************************************
 975 *                               mmioSetBuffer           [WINMM.@]
 976 */
 977 MMRESULT WINAPI mmioSetBuffer(HMMIO hmmio, LPSTR pchBuffer, LONG cchBuffer, UINT uFlags)
 978 {
 979     LPWINE_MMIO         wm;
 980
 981     TRACE("(hmmio=%p, pchBuf=%p, cchBuf=%d, uFlags=%#08x)\n",
 982           hmmio, pchBuffer, cchBuffer, uFlags);
 983
 984     if ((wm = MMIO_Get(hmmio)) == NULL)
 985         return MMSYSERR_INVALHANDLE;
 986
 987     return MMIO_SetBuffer(wm, pchBuffer, cchBuffer, uFlags);
 988 }
 989
 990 /**************************************************************************
 991  *                              mmioFlush               [WINMM.@]
 992  */
 993 MMRESULT WINAPI mmioFlush(HMMIO hmmio, UINT uFlags)
 994 {
 995     LPWINE_MMIO         wm;
 996
 997     TRACE("(%p, %04X)\n", hmmio, uFlags);
 998
 999     if ((wm = MMIO_Get(hmmio)) == NULL)
1000         return MMSYSERR_INVALHANDLE;
1001
1002     return MMIO_Flush(wm, uFlags);
1003 }
1004
1005 /**************************************************************************
1006  *                              mmioAdvance             [WINMM.@]
1007  */
1008 MMRESULT WINAPI mmioAdvance(HMMIO hmmio, MMIOINFO* lpmmioinfo, UINT uFlags)
1009 {
1010     LPWINE_MMIO         wm;
1011
1012     TRACE("hmmio=%p, lpmmioinfo=%p, uFlags=%04X\n", hmmio, lpmmioinfo, uFlags);
1013
1014     /* NOTE: mmioAdvance16 heavily relies on parameters from lpmmioinfo we're using
1015      * here. be sure if you change something here to check mmioAdvance16 as well
1016      */
1017     if ((wm = MMIO_Get(hmmio)) == NULL)
1018         return MMSYSERR_INVALHANDLE;
1019
1020     if (!wm->info.cchBuffer)
1021         return MMIOERR_UNBUFFERED;
1022
1023     if (uFlags != MMIO_READ && uFlags != MMIO_WRITE)
1024         return MMSYSERR_INVALPARAM;
1025
1026     if (uFlags == MMIO_WRITE && (lpmmioinfo->dwFlags & MMIO_DIRTY))
1027     {
1028         send_message(wm->ioProc, &wm->info, MMIOM_SEEK,
1029                      lpmmioinfo->lBufOffset, SEEK_SET, MMIO_PROC_32A);
1030         send_message(wm->ioProc, &wm->info, MMIOM_WRITE,
1031                      (LPARAM)lpmmioinfo->pchBuffer,
1032                      lpmmioinfo->pchNext - lpmmioinfo->pchBuffer, MMIO_PROC_32A);
1033         lpmmioinfo->dwFlags &= ~MMIO_DIRTY;
1034     }
1035     if (MMIO_Flush(wm, 0) != MMSYSERR_NOERROR)
1036         return MMIOERR_CANNOTWRITE;
1037
1038     if (lpmmioinfo) {
1039         wm->dwFileSize = max(wm->dwFileSize, lpmmioinfo->lBufOffset +
1040                              (lpmmioinfo->pchNext - lpmmioinfo->pchBuffer));
1041     }
1042     MMIO_GrabNextBuffer(wm, uFlags == MMIO_READ);
1043
1044     if (lpmmioinfo) {
1045         lpmmioinfo->pchNext = lpmmioinfo->pchBuffer;
1046         lpmmioinfo->pchEndRead  = lpmmioinfo->pchBuffer +
1047             (wm->info.pchEndRead - wm->info.pchBuffer);
1048         lpmmioinfo->pchEndWrite = lpmmioinfo->pchBuffer +
1049             (wm->info.pchEndWrite - wm->info.pchBuffer);
1050         lpmmioinfo->lDiskOffset = wm->info.lDiskOffset;
1051         lpmmioinfo->lBufOffset = wm->info.lBufOffset;
1052     }
1053     return MMSYSERR_NOERROR;
1054 }
1055
1056 /**************************************************************************
1057  *                              mmioStringToFOURCCA     [WINMM.@]
1058  */
1059 FOURCC WINAPI mmioStringToFOURCCA(LPCSTR sz, UINT uFlags)
1060 {
1061     CHAR cc[4];
1062     int i = 0;
1063
1064     for (i = 0; i < 4 && sz[i]; i++) {
1065         if (uFlags & MMIO_TOUPPER) {
1066             cc[i] = toupper(sz[i]);
1067         } else {
1068             cc[i] = sz[i];
1069         }
1070     }
1071
1072     /* Pad with spaces */
1073     while (i < 4) cc[i++] = ' ';
1074
1075     TRACE("Got '%.4s'\n",cc);
1076     return mmioFOURCC(cc[0],cc[1],cc[2],cc[3]);
1077 }
1078
1079 /**************************************************************************
1080  *                              mmioStringToFOURCCW     [WINMM.@]
1081  */
1082 FOURCC WINAPI mmioStringToFOURCCW(LPCWSTR sz, UINT uFlags)
1083 {
1084     char        szA[4];
1085
1086     WideCharToMultiByte( CP_ACP, 0, sz, 4, szA, sizeof(szA), NULL, NULL );
1087     return mmioStringToFOURCCA(szA,uFlags);
1088 }
1089
1090 /**************************************************************************
1091  *                              mmioInstallIOProcA         [WINMM.@]
1092  */
1093 LPMMIOPROC WINAPI mmioInstallIOProcA(FOURCC fccIOProc,
1094                                      LPMMIOPROC pIOProc, DWORD dwFlags)
1095 {
1096     return MMIO_InstallIOProc(fccIOProc, pIOProc, dwFlags, MMIO_PROC_32A);
1097 }
1098
1099 /**************************************************************************
1100  *                              mmioInstallIOProcW         [WINMM.@]
1101  */
1102 LPMMIOPROC WINAPI mmioInstallIOProcW(FOURCC fccIOProc,
1103                                      LPMMIOPROC pIOProc, DWORD dwFlags)
1104 {
1105     return MMIO_InstallIOProc(fccIOProc, pIOProc, dwFlags, MMIO_PROC_32W);
1106 }
1107
1108 /******************************************************************
1109  *              MMIO_SendMessage
1110  *
1111  *
1112  */
1113 LRESULT         MMIO_SendMessage(HMMIO hmmio, UINT uMessage, LPARAM lParam1,
1114                                  LPARAM lParam2, enum mmioProcType type)
1115 {
1116     LPWINE_MMIO         wm;
1117
1118     TRACE("(%p, %u, %ld, %ld, %d)\n", hmmio, uMessage, lParam1, lParam2, type);
1119
1120     if (uMessage < MMIOM_USER)
1121         return MMSYSERR_INVALPARAM;
1122
1123     if ((wm = MMIO_Get(hmmio)) == NULL)
1124         return MMSYSERR_INVALHANDLE;
1125
1126     return send_message(wm->ioProc, &wm->info, uMessage, lParam1, lParam2, type);
1127 }
1128
1129 /**************************************************************************
1130  *                              mmioSendMessage         [WINMM.@]
1131  */
1132 LRESULT WINAPI mmioSendMessage(HMMIO hmmio, UINT uMessage,
1133                                LPARAM lParam1, LPARAM lParam2)
1134 {
1135     return MMIO_SendMessage(hmmio, uMessage, lParam1, lParam2, MMIO_PROC_32A);
1136 }
1137
1138 /**************************************************************************
1139  *                              mmioDescend             [WINMM.@]
1140  */
1141 MMRESULT WINAPI mmioDescend(HMMIO hmmio, LPMMCKINFO lpck,
1142                             const MMCKINFO* lpckParent, UINT uFlags)
1143 {
1144     DWORD               dwOldPos;
1145     FOURCC              srchCkId;
1146     FOURCC              srchType;
1147
1148     TRACE("(%p, %p, %p, %04X);\n", hmmio, lpck, lpckParent, uFlags);
1149
1150     if (lpck == NULL)
1151         return MMSYSERR_INVALPARAM;
1152
1153     dwOldPos = mmioSeek(hmmio, 0, SEEK_CUR);
1154     TRACE("dwOldPos=%d\n", dwOldPos);
1155
1156     if (lpckParent != NULL) {
1157         TRACE("seek inside parent at %d !\n", lpckParent->dwDataOffset);
1158         /* EPP: was dwOldPos = mmioSeek(hmmio,lpckParent->dwDataOffset,SEEK_SET); */
1159         if (dwOldPos < lpckParent->dwDataOffset ||
1160             dwOldPos >= lpckParent->dwDataOffset + lpckParent->cksize) {
1161             WARN("outside parent chunk\n");
1162             return MMIOERR_CHUNKNOTFOUND;
1163         }
1164     }
1165
1166     /* The SDK docu says 'ckid' is used for all cases. Real World
1167      * examples disagree -Marcus,990216.
1168      */
1169
1170     srchCkId = 0;
1171     srchType = 0;
1172
1173     /* find_chunk looks for 'ckid' */
1174     if (uFlags & MMIO_FINDCHUNK)
1175         srchCkId = lpck->ckid;
1176
1177     /* find_riff and find_list look for 'fccType' */
1178     if (uFlags & MMIO_FINDLIST)
1179     {
1180         srchCkId = FOURCC_LIST;
1181         srchType = lpck->fccType;
1182     }
1183
1184     if (uFlags & MMIO_FINDRIFF)
1185     {
1186         srchCkId = FOURCC_RIFF;
1187         srchType = lpck->fccType;
1188     }
1189
1190     TRACE("searching for %4.4s.%4.4s\n",
1191           (LPCSTR)&srchCkId, srchType ? (LPCSTR)&srchType : "any");
1192
1193     while (TRUE)
1194     {
1195         LONG ix;
1196
1197         ix = mmioRead(hmmio, (LPSTR)lpck, 3 * sizeof(DWORD));
1198         if (ix < 2*sizeof(DWORD))
1199         {
1200             mmioSeek(hmmio, dwOldPos, SEEK_SET);
1201             WARN("return ChunkNotFound\n");
1202             return MMIOERR_CHUNKNOTFOUND;
1203         }
1204
1205         lpck->dwDataOffset = dwOldPos + 2 * sizeof(DWORD);
1206         TRACE("ckid=%4.4s fcc=%4.4s cksize=%08X !\n",
1207               (LPCSTR)&lpck->ckid,
1208               srchType ? (LPCSTR)&lpck->fccType:"<na>",
1209               lpck->cksize);
1210         if ( (!srchCkId || (srchCkId == lpck->ckid)) &&
1211              (!srchType || (srchType == lpck->fccType)) )
1212             break;
1213
1214         dwOldPos = lpck->dwDataOffset + ((lpck->cksize + 1) & ~1);
1215         mmioSeek(hmmio, dwOldPos, SEEK_SET);
1216     }
1217
1218     lpck->dwFlags = 0;
1219     /* If we were looking for RIFF/LIST chunks, the final file position
1220      * is after the chunkid. If we were just looking for the chunk
1221      * it is after the cksize. So add 4 in RIFF/LIST case.
1222      */
1223     if (lpck->ckid == FOURCC_RIFF || lpck->ckid == FOURCC_LIST)
1224         mmioSeek(hmmio, lpck->dwDataOffset + sizeof(DWORD), SEEK_SET);
1225     else
1226         mmioSeek(hmmio, lpck->dwDataOffset, SEEK_SET);
1227     TRACE("lpck: ckid=%.4s, cksize=%d, dwDataOffset=%d fccType=%08X (%.4s)!\n",
1228           (LPSTR)&lpck->ckid, lpck->cksize, lpck->dwDataOffset,
1229           lpck->fccType, srchType?(LPSTR)&lpck->fccType:"");
1230     return MMSYSERR_NOERROR;
1231 }
1232
1233 /**************************************************************************
1234  *                              mmioAscend              [WINMM.@]
1235  */
1236 MMRESULT WINAPI mmioAscend(HMMIO hmmio, LPMMCKINFO lpck, UINT uFlags)
1237 {
1238     TRACE("(%p, %p, %04X);\n", hmmio, lpck, uFlags);
1239
1240     if (lpck->dwFlags & MMIO_DIRTY) {
1241         DWORD   dwOldPos, dwNewSize;
1242
1243         TRACE("Chunk is dirty, checking if chunk's size is correct\n");
1244         dwOldPos = mmioSeek(hmmio, 0, SEEK_CUR);
1245         TRACE("dwOldPos=%d lpck->dwDataOffset = %d\n", dwOldPos, lpck->dwDataOffset);
1246         dwNewSize = dwOldPos - lpck->dwDataOffset;
1247         if (dwNewSize != lpck->cksize) {
1248             TRACE("Nope: lpck->cksize=%d dwNewSize=%d\n", lpck->cksize, dwNewSize);
1249             lpck->cksize = dwNewSize;
1250
1251             /* pad odd size with 0 */
1252             if (dwNewSize & 1) {
1253                 char ch = 0;
1254                 mmioWrite(hmmio, &ch, 1);
1255             }
1256             mmioSeek(hmmio, lpck->dwDataOffset - sizeof(DWORD), SEEK_SET);
1257             mmioWrite(hmmio, (LPSTR)&dwNewSize, sizeof(DWORD));
1258         }
1259         lpck->dwFlags = 0;
1260     }
1261
1262     mmioSeek(hmmio, lpck->dwDataOffset + ((lpck->cksize + 1) & ~1), SEEK_SET);
1263
1264     return MMSYSERR_NOERROR;
1265 }
1266
1267 /**************************************************************************
1268  *                      mmioCreateChunk                         [WINMM.@]
1269  */
1270 MMRESULT WINAPI mmioCreateChunk(HMMIO hmmio, MMCKINFO* lpck, UINT uFlags)
1271 {
1272     DWORD       dwOldPos;
1273     LONG        size;
1274     LONG        ix;
1275
1276     TRACE("(%p, %p, %04X);\n", hmmio, lpck, uFlags);
1277
1278     dwOldPos = mmioSeek(hmmio, 0, SEEK_CUR);
1279     TRACE("dwOldPos=%d\n", dwOldPos);
1280
1281     if (uFlags == MMIO_CREATELIST)
1282         lpck->ckid = FOURCC_LIST;
1283     else if (uFlags == MMIO_CREATERIFF)
1284         lpck->ckid = FOURCC_RIFF;
1285
1286     TRACE("ckid=%.4s\n", (LPSTR)&lpck->ckid);
1287
1288     size = 2 * sizeof(DWORD);
1289     lpck->dwDataOffset = dwOldPos + size;
1290
1291     if (lpck->ckid == FOURCC_RIFF || lpck->ckid == FOURCC_LIST)
1292         size += sizeof(DWORD);
1293     lpck->dwFlags = MMIO_DIRTY;
1294
1295     ix = mmioWrite(hmmio, (LPSTR)lpck, size);
1296     TRACE("after mmioWrite ix = %d req = %d, errno = %d\n", ix, size, errno);
1297     if (ix < size) {
1298         mmioSeek(hmmio, dwOldPos, SEEK_SET);
1299         WARN("return CannotWrite\n");
1300         return MMIOERR_CANNOTWRITE;
1301     }
1302
1303     return MMSYSERR_NOERROR;
1304 }
1305
1306 /**************************************************************************
1307  *                              mmioRenameA                     [WINMM.@]
1308  */
1309 MMRESULT WINAPI mmioRenameA(LPCSTR szFileName, LPCSTR szNewFileName,
1310                             const MMIOINFO* lpmmioinfo, DWORD dwFlags)
1311 {
1312     struct IOProcList*  ioProc = NULL;
1313     struct IOProcList   tmp;
1314     FOURCC              fcc;
1315
1316     TRACE("('%s', '%s', %p, %08X);\n",
1317           debugstr_a(szFileName), debugstr_a(szNewFileName), lpmmioinfo, dwFlags);
1318
1319     /* If both params are NULL, then parse the file name */
1320     if (lpmmioinfo && lpmmioinfo->fccIOProc == 0 && lpmmioinfo->pIOProc == NULL)
1321     {
1322         fcc = MMIO_ParseExtA(szFileName);
1323         if (fcc) ioProc = MMIO_FindProcNode(fcc);
1324     }
1325
1326     /* Handle any unhandled/error case from above. Assume DOS file */
1327     if (!lpmmioinfo || (lpmmioinfo->fccIOProc == 0 && lpmmioinfo->pIOProc == NULL && ioProc == NULL))
1328         ioProc = MMIO_FindProcNode(FOURCC_DOS);
1329     /* if just the four character code is present, look up IO proc */
1330     else if (lpmmioinfo->pIOProc == NULL)
1331         ioProc = MMIO_FindProcNode(lpmmioinfo->fccIOProc);
1332     else /* use relevant ioProc */
1333     {
1334         ioProc = &tmp;
1335         tmp.fourCC = lpmmioinfo->fccIOProc;
1336         tmp.pIOProc = lpmmioinfo->pIOProc;
1337         tmp.type = MMIO_PROC_32A;
1338         tmp.count = 1;
1339     }
1340
1341     /* FIXME: should we actually pass lpmmioinfo down the drain ???
1342      * or make a copy of it because it's const ???
1343      */
1344     return send_message(ioProc, (MMIOINFO*)lpmmioinfo, MMIOM_RENAME,
1345                         (LPARAM)szFileName, (LPARAM)szNewFileName, MMIO_PROC_32A);
1346 }
1347
1348 /**************************************************************************
1349  *                              mmioRenameW                     [WINMM.@]
1350  */
1351 MMRESULT WINAPI mmioRenameW(LPCWSTR szFileName, LPCWSTR szNewFileName,
1352                             const MMIOINFO* lpmmioinfo, DWORD dwFlags)
1353 {
1354     LPSTR       szFn = NULL;
1355     LPSTR       sznFn = NULL;
1356     UINT        ret = MMSYSERR_NOMEM;
1357     INT         len;
1358
1359     if (szFileName)
1360     {
1361         len = WideCharToMultiByte( CP_ACP, 0, szFileName, -1, NULL, 0, NULL, NULL );
1362         szFn = HeapAlloc( GetProcessHeap(), 0, len );
1363         if (!szFn) goto done;
1364         WideCharToMultiByte( CP_ACP, 0, szFileName, -1, szFn, len, NULL, NULL );
1365     }
1366     if (szNewFileName)
1367     {
1368         len = WideCharToMultiByte( CP_ACP, 0, szNewFileName, -1, NULL, 0, NULL, NULL );
1369         sznFn = HeapAlloc( GetProcessHeap(), 0, len );
1370         if (!sznFn) goto done;
1371         WideCharToMultiByte( CP_ACP, 0, szNewFileName, -1, sznFn, len, NULL, NULL );
1372     }
1373
1374     ret = mmioRenameA(szFn, sznFn, lpmmioinfo, dwFlags);
1375
1376 done:
1377     HeapFree(GetProcessHeap(),0,szFn);
1378     HeapFree(GetProcessHeap(),0,sznFn);
1379     return ret;
1380 }