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