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