reactos/dll/win32/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] = (DWORD)OpenFile(szFileName, &ofs, lpmmioinfo->dwFlags & 0xFFFF);
  80             }
  81             if (lpmmioinfo->adwInfo[0] == (DWORD)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
 586     TRACE("('%s', %p, %08X, %s);\n", szFileName, refmminfo, dwOpenFlags, is_unicode ? "unicode" : "ansi");
 587
 588     if (!refmminfo) {
 589         refmminfo = &mmioinfo;
 590
 591         mmioinfo.fccIOProc = 0;
 592         mmioinfo.pIOProc = NULL;
 593         mmioinfo.pchBuffer = NULL;
 594         mmioinfo.cchBuffer = 0;
 595         is_unicode = FALSE;
 596     }
 597
 598     if (dwOpenFlags & (MMIO_PARSE|MMIO_EXIST)) {
 599         char    buffer[MAX_PATH];
 600
 601         if (!szFileName)
 602             return (HMMIO)FALSE;
 603         if (GetFullPathNameA(szFileName, sizeof(buffer), buffer, NULL) >= sizeof(buffer))
 604             return (HMMIO)FALSE;
 605         if ((dwOpenFlags & MMIO_EXIST) && (GetFileAttributesA(buffer) == INVALID_FILE_ATTRIBUTES))
 606             return (HMMIO)FALSE;
 607         strcpy(szFileName, buffer);
 608         return (HMMIO)TRUE;
 609     }
 610
 611     if ((wm = MMIO_Create()) == NULL)
 612         return 0;
 613
 614     /* If both params are NULL, then parse the file name if available */
 615     if (refmminfo->fccIOProc == 0 && refmminfo->pIOProc == NULL) {
 616         wm->info.fccIOProc = MMIO_ParseExtA(szFileName);
 617         /* Handle any unhandled/error case. Assume DOS file */
 618         if (wm->info.fccIOProc == 0)
 619             wm->info.fccIOProc = FOURCC_DOS;
 620         if (!(wm->ioProc = MMIO_FindProcNode(wm->info.fccIOProc))) {
 621             /* If not found, retry with FOURCC_DOS */
 622             wm->info.fccIOProc = FOURCC_DOS;
 623             if (!(wm->ioProc = MMIO_FindProcNode(wm->info.fccIOProc)))
 624                 goto error2;
 625         }
 626         wm->bTmpIOProc = FALSE;
 627     }
 628     /* if just the four character code is present, look up IO proc */
 629     else if (refmminfo->pIOProc == NULL) {
 630         wm->info.fccIOProc = refmminfo->fccIOProc;
 631         if (!(wm->ioProc = MMIO_FindProcNode(wm->info.fccIOProc))) goto error2;
 632         wm->bTmpIOProc = FALSE;
 633     }
 634     /* if IO proc specified, use it and specified four character code */
 635     else {
 636         wm->info.fccIOProc = refmminfo->fccIOProc;
 637         MMIO_InstallIOProc(wm->info.fccIOProc, refmminfo->pIOProc,
 638                            MMIO_INSTALLPROC, is_unicode);
 639         if (!(wm->ioProc = MMIO_FindProcNode(wm->info.fccIOProc))) goto error2;
 640         assert(wm->ioProc->pIOProc == refmminfo->pIOProc);
 641         wm->bTmpIOProc = TRUE;
 642     }
 643
 644     wm->ioProc->count++;
 645     wm->info.dwFlags = dwOpenFlags;
 646
 647     if (dwOpenFlags & MMIO_ALLOCBUF) {
 648         refmminfo->wErrorRet = MMIO_SetBuffer(wm, refmminfo->pchBuffer,
 649             refmminfo->cchBuffer ? refmminfo->cchBuffer : MMIO_DEFAULTBUFFER, 0);
 650         if (refmminfo->wErrorRet != MMSYSERR_NOERROR)
 651             goto error1;
 652     } else {
 653         refmminfo->wErrorRet = MMIO_SetBuffer(wm, refmminfo->pchBuffer, refmminfo->cchBuffer, 0);
 654         if (refmminfo->wErrorRet != MMSYSERR_NOERROR)
 655             goto error1;
 656     }
 657
 658     if (wm->info.fccIOProc == FOURCC_MEM && !(wm->info.dwFlags & MMIO_ALLOCBUF))
 659         wm->bBufferLoaded = TRUE;
 660
 661     /* see mmioDosIOProc for that one */
 662     wm->info.adwInfo[0] = refmminfo->adwInfo[0];
 663
 664     /* call IO proc to actually open file */
 665     refmminfo->wErrorRet = send_message(wm->ioProc, &wm->info, MMIOM_OPEN,
 666                                         (LPARAM)szFileName, 0, FALSE);
 667
 668     /* grab file size, when possible (FIXME: not 64 bit safe) */
 669     wm->dwFileSize = GetFileSize((HANDLE)(ULONG_PTR)wm->info.adwInfo[0], NULL);
 670
 671     if (refmminfo->wErrorRet == 0)
 672         return wm->info.hmmio;
 673  error1:
 674     if (wm->ioProc) wm->ioProc->count--;
 675  error2:
 676     MMIO_Destroy(wm);
 677     return 0;
 678 }
 679
 680 /**************************************************************************
 681  *                              mmioOpenW                       [WINMM.@]
 682  */
 683 HMMIO WINAPI mmioOpenW(LPWSTR szFileName, MMIOINFO* lpmmioinfo,
 684                        DWORD dwOpenFlags)
 685 {
 686     HMMIO       ret;
 687     LPSTR       szFn = NULL;
 688
 689     if (szFileName)
 690     {
 691         INT     len = WideCharToMultiByte( CP_ACP, 0, szFileName, -1, NULL, 0, NULL, NULL );
 692         szFn = HeapAlloc( GetProcessHeap(), 0, len );
 693         if (!szFn) return NULL;
 694         WideCharToMultiByte( CP_ACP, 0, szFileName, -1, szFn, len, NULL, NULL );
 695     }
 696
 697     ret = MMIO_Open(szFn, lpmmioinfo, dwOpenFlags, TRUE);
 698
 699     HeapFree(GetProcessHeap(), 0, szFn);
 700     return ret;
 701 }
 702
 703 /**************************************************************************
 704  *                              mmioOpenA                       [WINMM.@]
 705  */
 706 HMMIO WINAPI mmioOpenA(LPSTR szFileName, MMIOINFO* lpmmioinfo,
 707                        DWORD dwOpenFlags)
 708 {
 709     return  MMIO_Open(szFileName, lpmmioinfo, dwOpenFlags, FALSE);
 710 }
 711
 712 /**************************************************************************
 713  *                              mmioClose               [WINMM.@]
 714  */
 715 MMRESULT WINAPI mmioClose(HMMIO hmmio, UINT uFlags)
 716 {
 717     LPWINE_MMIO wm;
 718     MMRESULT    result;
 719
 720     TRACE("(%p, %04X);\n", hmmio, uFlags);
 721
 722     if ((wm = MMIO_Get(hmmio)) == NULL)
 723         return MMSYSERR_INVALHANDLE;
 724
 725     if ((result = MMIO_Flush(wm, 0)) != MMSYSERR_NOERROR)
 726         return result;
 727
 728     result = send_message(wm->ioProc, &wm->info, MMIOM_CLOSE, uFlags, 0, FALSE);
 729
 730     MMIO_SetBuffer(wm, NULL, 0, 0);
 731
 732     wm->ioProc->count--;
 733
 734     if (wm->bTmpIOProc)
 735         MMIO_InstallIOProc(wm->info.fccIOProc, wm->ioProc->pIOProc,
 736                            MMIO_REMOVEPROC, wm->ioProc->is_unicode);
 737
 738     MMIO_Destroy(wm);
 739
 740     return result;
 741 }
 742
 743 /**************************************************************************
 744  *                              mmioRead                [WINMM.@]
 745  */
 746 LONG WINAPI mmioRead(HMMIO hmmio, HPSTR pch, LONG cch)
 747 {
 748     LPWINE_MMIO wm;
 749     LONG        count;
 750
 751     TRACE("(%p, %p, %d);\n", hmmio, pch, cch);
 752
 753     if ((wm = MMIO_Get(hmmio)) == NULL)
 754         return -1;
 755
 756     /* unbuffered case first */
 757     if (!wm->info.pchBuffer)
 758         return send_message(wm->ioProc, &wm->info, MMIOM_READ, (LPARAM)pch, cch, FALSE);
 759
 760     /* first try from current buffer */
 761     if (wm->info.pchNext != wm->info.pchEndRead) {
 762         count = wm->info.pchEndRead - wm->info.pchNext;
 763         if (count > cch || count < 0) count = cch;
 764         memcpy(pch, wm->info.pchNext, count);
 765         wm->info.pchNext += count;
 766         pch += count;
 767         cch -= count;
 768     } else
 769         count = 0;
 770
 771     if (cch && (wm->info.fccIOProc != FOURCC_MEM)) {
 772         assert(wm->info.cchBuffer);
 773
 774         while (cch) {
 775             LONG size;
 776
 777             size = MMIO_GrabNextBuffer(wm, TRUE);
 778             if (size <= 0) break;
 779             if (size > cch) size = cch;
 780             memcpy(pch, wm->info.pchBuffer, size);
 781             wm->info.pchNext += size;
 782             pch += size;
 783             cch -= size;
 784             count += size;
 785         }
 786     }
 787
 788     TRACE("count=%d\n", count);
 789     return count;
 790 }
 791
 792 /**************************************************************************
 793  *                              mmioWrite               [WINMM.@]
 794  */
 795 LONG WINAPI mmioWrite(HMMIO hmmio, HPCSTR pch, LONG cch)
 796 {
 797     LPWINE_MMIO wm;
 798     LONG        count;
 799
 800     TRACE("(%p, %p, %d);\n", hmmio, pch, cch);
 801
 802     if ((wm = MMIO_Get(hmmio)) == NULL)
 803         return -1;
 804
 805     if (wm->info.cchBuffer) {
 806         LONG    bytesW = 0;
 807
 808         count = 0;
 809         while (cch) {
 810             if (wm->info.pchNext != wm->info.pchEndWrite) {
 811                 count = wm->info.pchEndWrite - wm->info.pchNext;
 812                 if (count > cch || count < 0) count = cch;
 813                 memcpy(wm->info.pchNext, pch, count);
 814                 wm->info.pchNext += count;
 815                 pch += count;
 816                 cch -= count;
 817                 bytesW += count;
 818                 wm->info.dwFlags |= MMIO_DIRTY;
 819             } else {
 820                 if (wm->info.fccIOProc == FOURCC_MEM) {
 821                     if (wm->info.adwInfo[0]) {
 822                         /* from where would we get the memory handle? */
 823                         FIXME("memory file expansion not implemented!\n");
 824                         break;
 825                     } else break;
 826                 }
 827             }
 828
 829             if (wm->info.pchNext == wm->info.pchEndWrite)
 830             {
 831                 MMIO_Flush(wm, MMIO_EMPTYBUF);
 832                 MMIO_GrabNextBuffer(wm, FALSE);
 833             }
 834             else break;
 835         }
 836         count = bytesW;
 837     } else {
 838         count = send_message(wm->ioProc, &wm->info, MMIOM_WRITE, (LPARAM)pch, cch, FALSE);
 839         wm->info.lBufOffset = wm->info.lDiskOffset;
 840     }
 841
 842     TRACE("bytes written=%d\n", count);
 843     return count;
 844 }
 845
 846 /**************************************************************************
 847  *                              mmioSeek                [WINMM.@]
 848  */
 849 LONG WINAPI mmioSeek(HMMIO hmmio, LONG lOffset, INT iOrigin)
 850 {
 851     LPWINE_MMIO wm;
 852     LONG        offset;
 853
 854     TRACE("(%p, %08X, %d);\n", hmmio, lOffset, iOrigin);
 855
 856     if ((wm = MMIO_Get(hmmio)) == NULL)
 857         return MMSYSERR_INVALHANDLE;
 858
 859     /* not buffered, direct seek on file */
 860     if (!wm->info.pchBuffer)
 861         return send_message(wm->ioProc, &wm->info, MMIOM_SEEK, lOffset, iOrigin, FALSE);
 862
 863     switch (iOrigin) {
 864     case SEEK_SET:
 865         offset = lOffset;
 866         break;
 867     case SEEK_CUR:
 868         offset = wm->info.lBufOffset + (wm->info.pchNext - wm->info.pchBuffer) + lOffset;
 869         break;
 870     case SEEK_END:
 871         offset = ((wm->info.fccIOProc == FOURCC_MEM)? wm->info.cchBuffer : wm->dwFileSize) - lOffset;
 872         break;
 873     default:
 874         return -1;
 875     }
 876
 877     if (offset && offset >= wm->dwFileSize && wm->info.fccIOProc != FOURCC_MEM) {
 878         /* should check that write mode exists */
 879         if (MMIO_Flush(wm, 0) != MMSYSERR_NOERROR)
 880             return -1;
 881         wm->info.lBufOffset = offset;
 882         wm->info.pchEndRead = wm->info.pchBuffer;
 883         wm->info.pchEndWrite = wm->info.pchBuffer + wm->info.cchBuffer;
 884         if ((wm->info.dwFlags & MMIO_RWMODE) == MMIO_READ) {
 885             wm->info.lDiskOffset = wm->dwFileSize;
 886         }
 887     } else if ((wm->info.cchBuffer > 0) &&
 888         ((offset < wm->info.lBufOffset) ||
 889          (offset >= wm->info.lBufOffset + wm->info.cchBuffer) ||
 890          !wm->bBufferLoaded)) {
 891         /* stay in same buffer ? */
 892         /* some memory mapped buffers are defined with -1 as a size */
 893
 894         /* condition to change buffer */
 895         if ((wm->info.fccIOProc == FOURCC_MEM) ||
 896             MMIO_Flush(wm, 0) != MMSYSERR_NOERROR ||
 897             /* this also sets the wm->info.lDiskOffset field */
 898             send_message(wm->ioProc, &wm->info, MMIOM_SEEK,
 899                          (offset / wm->info.cchBuffer) * wm->info.cchBuffer,
 900                          SEEK_SET, FALSE) == -1)
 901             return -1;
 902         MMIO_GrabNextBuffer(wm, TRUE);
 903     }
 904
 905     wm->info.pchNext = wm->info.pchBuffer + (offset - wm->info.lBufOffset);
 906
 907     TRACE("=> %d\n", offset);
 908     return offset;
 909 }
 910
 911 /**************************************************************************
 912  *                              mmioGetInfo             [WINMM.@]
 913  */
 914 MMRESULT WINAPI mmioGetInfo(HMMIO hmmio, MMIOINFO* lpmmioinfo, UINT uFlags)
 915 {
 916     LPWINE_MMIO         wm;
 917
 918     TRACE("(%p,%p,0x%08x)\n",hmmio,lpmmioinfo,uFlags);
 919
 920     if ((wm = MMIO_Get(hmmio)) == NULL)
 921         return MMSYSERR_INVALHANDLE;
 922
 923     *lpmmioinfo = wm->info;
 924
 925     return MMSYSERR_NOERROR;
 926 }
 927
 928 /**************************************************************************
 929  *                              mmioSetInfo             [WINMM.@]
 930  */
 931 MMRESULT WINAPI mmioSetInfo(HMMIO hmmio, const MMIOINFO* lpmmioinfo, UINT uFlags)
 932 {
 933     LPWINE_MMIO         wm;
 934
 935     TRACE("(%p,%p,0x%08x)\n",hmmio,lpmmioinfo,uFlags);
 936
 937     if ((wm = MMIO_Get(hmmio)) == NULL)
 938         return MMSYSERR_INVALHANDLE;
 939
 940     /* check pointers coherence */
 941     if (lpmmioinfo->pchNext < wm->info.pchBuffer ||
 942         lpmmioinfo->pchNext > wm->info.pchBuffer + wm->info.cchBuffer ||
 943         lpmmioinfo->pchEndRead < wm->info.pchBuffer ||
 944         lpmmioinfo->pchEndRead > wm->info.pchBuffer + wm->info.cchBuffer ||
 945         lpmmioinfo->pchEndWrite < wm->info.pchBuffer ||
 946         lpmmioinfo->pchEndWrite > wm->info.pchBuffer + wm->info.cchBuffer)
 947         return MMSYSERR_INVALPARAM;
 948
 949     wm->info.pchNext = lpmmioinfo->pchNext;
 950     wm->info.pchEndRead = lpmmioinfo->pchEndRead;
 951
 952     return MMSYSERR_NOERROR;
 953 }
 954
 955 /**************************************************************************
 956 *                               mmioSetBuffer           [WINMM.@]
 957 */
 958 MMRESULT WINAPI mmioSetBuffer(HMMIO hmmio, LPSTR pchBuffer, LONG cchBuffer, UINT uFlags)
 959 {
 960     LPWINE_MMIO         wm;
 961
 962     TRACE("(hmmio=%p, pchBuf=%p, cchBuf=%d, uFlags=%#08x)\n",
 963           hmmio, pchBuffer, cchBuffer, uFlags);
 964
 965     if ((wm = MMIO_Get(hmmio)) == NULL)
 966         return MMSYSERR_INVALHANDLE;
 967
 968     return MMIO_SetBuffer(wm, pchBuffer, cchBuffer, uFlags);
 969 }
 970
 971 /**************************************************************************
 972  *                              mmioFlush               [WINMM.@]
 973  */
 974 MMRESULT WINAPI mmioFlush(HMMIO hmmio, UINT uFlags)
 975 {
 976     LPWINE_MMIO         wm;
 977
 978     TRACE("(%p, %04X)\n", hmmio, uFlags);
 979
 980     if ((wm = MMIO_Get(hmmio)) == NULL)
 981         return MMSYSERR_INVALHANDLE;
 982
 983     return MMIO_Flush(wm, uFlags);
 984 }
 985
 986 /**************************************************************************
 987  *                              mmioAdvance             [WINMM.@]
 988  */
 989 MMRESULT WINAPI mmioAdvance(HMMIO hmmio, MMIOINFO* lpmmioinfo, UINT uFlags)
 990 {
 991     LPWINE_MMIO         wm;
 992
 993     TRACE("hmmio=%p, lpmmioinfo=%p, uFlags=%04X\n", hmmio, lpmmioinfo, uFlags);
 994
 995     /* NOTE: mmioAdvance16 heavily relies on parameters from lpmmioinfo we're using
 996      * here. be sure if you change something here to check mmioAdvance16 as well
 997      */
 998     if ((wm = MMIO_Get(hmmio)) == NULL)
 999         return MMSYSERR_INVALHANDLE;
1000
1001     if (!wm->info.cchBuffer)
1002         return MMIOERR_UNBUFFERED;
1003
1004     if (uFlags != MMIO_READ && uFlags != MMIO_WRITE)
1005         return MMSYSERR_INVALPARAM;
1006
1007     if (uFlags == MMIO_WRITE && (lpmmioinfo->dwFlags & MMIO_DIRTY))
1008     {
1009         send_message(wm->ioProc, &wm->info, MMIOM_SEEK, lpmmioinfo->lBufOffset, SEEK_SET, FALSE);
1010         send_message(wm->ioProc, &wm->info, MMIOM_WRITE, (LPARAM)lpmmioinfo->pchBuffer,
1011                      lpmmioinfo->pchNext - lpmmioinfo->pchBuffer, FALSE);
1012         lpmmioinfo->dwFlags &= ~MMIO_DIRTY;
1013     }
1014     if (MMIO_Flush(wm, 0) != MMSYSERR_NOERROR)
1015         return MMIOERR_CANNOTWRITE;
1016
1017     if (lpmmioinfo) {
1018         wm->dwFileSize = max(wm->dwFileSize, lpmmioinfo->lBufOffset +
1019                              (lpmmioinfo->pchNext - lpmmioinfo->pchBuffer));
1020     }
1021     MMIO_GrabNextBuffer(wm, uFlags == MMIO_READ);
1022
1023     if (lpmmioinfo) {
1024         lpmmioinfo->pchNext = lpmmioinfo->pchBuffer;
1025         lpmmioinfo->pchEndRead  = lpmmioinfo->pchBuffer +
1026             (wm->info.pchEndRead - wm->info.pchBuffer);
1027         lpmmioinfo->pchEndWrite = lpmmioinfo->pchBuffer +
1028             (wm->info.pchEndWrite - wm->info.pchBuffer);
1029         lpmmioinfo->lDiskOffset = wm->info.lDiskOffset;
1030         lpmmioinfo->lBufOffset = wm->info.lBufOffset;
1031     }
1032     return MMSYSERR_NOERROR;
1033 }
1034
1035 /**************************************************************************
1036  *                              mmioStringToFOURCCA     [WINMM.@]
1037  */
1038 FOURCC WINAPI mmioStringToFOURCCA(LPCSTR sz, UINT uFlags)
1039 {
1040     CHAR cc[4];
1041     int i = 0;
1042
1043     for (i = 0; i < 4 && sz[i]; i++) {
1044         if (uFlags & MMIO_TOUPPER) {
1045             cc[i] = toupper(sz[i]);
1046         } else {
1047             cc[i] = sz[i];
1048         }
1049     }
1050
1051     /* Pad with spaces */
1052     while (i < 4) cc[i++] = ' ';
1053
1054     TRACE("Got '%.4s'\n",cc);
1055     return mmioFOURCC(cc[0],cc[1],cc[2],cc[3]);
1056 }
1057
1058 /**************************************************************************
1059  *                              mmioStringToFOURCCW     [WINMM.@]
1060  */
1061 FOURCC WINAPI mmioStringToFOURCCW(LPCWSTR sz, UINT uFlags)
1062 {
1063     char        szA[4];
1064
1065     WideCharToMultiByte( CP_ACP, 0, sz, 4, szA, sizeof(szA), NULL, NULL );
1066     return mmioStringToFOURCCA(szA,uFlags);
1067 }
1068
1069 /**************************************************************************
1070  *                              mmioInstallIOProcA         [WINMM.@]
1071  */
1072 LPMMIOPROC WINAPI mmioInstallIOProcA(FOURCC fccIOProc,
1073                                      LPMMIOPROC pIOProc, DWORD dwFlags)
1074 {
1075     return MMIO_InstallIOProc(fccIOProc, pIOProc, dwFlags, FALSE);
1076 }
1077
1078 /**************************************************************************
1079  *                              mmioInstallIOProcW         [WINMM.@]
1080  */
1081 LPMMIOPROC WINAPI mmioInstallIOProcW(FOURCC fccIOProc,
1082                                      LPMMIOPROC pIOProc, DWORD dwFlags)
1083 {
1084     return MMIO_InstallIOProc(fccIOProc, pIOProc, dwFlags, TRUE);
1085 }
1086
1087 /******************************************************************
1088  *              MMIO_SendMessage
1089  *
1090  *
1091  */
1092 static LRESULT  MMIO_SendMessage(HMMIO hmmio, UINT uMessage, LPARAM lParam1,
1093                                  LPARAM lParam2, BOOL is_unicode)
1094 {
1095     LPWINE_MMIO         wm;
1096
1097     TRACE("(%p, %u, %ld, %ld, %s)\n", hmmio, uMessage, lParam1, lParam2, is_unicode ? "unicode" : "ansi");
1098
1099     if (uMessage < MMIOM_USER)
1100         return MMSYSERR_INVALPARAM;
1101
1102     if ((wm = MMIO_Get(hmmio)) == NULL)
1103         return MMSYSERR_INVALHANDLE;
1104
1105     return send_message(wm->ioProc, &wm->info, uMessage, lParam1, lParam2, is_unicode);
1106 }
1107
1108 /**************************************************************************
1109  *                              mmioSendMessage         [WINMM.@]
1110  */
1111 LRESULT WINAPI mmioSendMessage(HMMIO hmmio, UINT uMessage,
1112                                LPARAM lParam1, LPARAM lParam2)
1113 {
1114     return MMIO_SendMessage(hmmio, uMessage, lParam1, lParam2, FALSE);
1115 }
1116
1117 /**************************************************************************
1118  *                              mmioDescend             [WINMM.@]
1119  */
1120 MMRESULT WINAPI mmioDescend(HMMIO hmmio, LPMMCKINFO lpck,
1121                             const MMCKINFO* lpckParent, UINT uFlags)
1122 {
1123     DWORD               dwOldPos;
1124     FOURCC              srchCkId;
1125     FOURCC              srchType;
1126
1127     TRACE("(%p, %p, %p, %04X);\n", hmmio, lpck, lpckParent, uFlags);
1128
1129     if (lpck == NULL)
1130         return MMSYSERR_INVALPARAM;
1131
1132     dwOldPos = mmioSeek(hmmio, 0, SEEK_CUR);
1133     TRACE("dwOldPos=%d\n", dwOldPos);
1134
1135     if (lpckParent != NULL) {
1136         TRACE("seek inside parent at %d !\n", lpckParent->dwDataOffset);
1137         /* EPP: was dwOldPos = mmioSeek(hmmio,lpckParent->dwDataOffset,SEEK_SET); */
1138         if (dwOldPos < lpckParent->dwDataOffset ||
1139             dwOldPos >= lpckParent->dwDataOffset + lpckParent->cksize) {
1140             WARN("outside parent chunk\n");
1141             return MMIOERR_CHUNKNOTFOUND;
1142         }
1143     }
1144
1145     /* The SDK docu says 'ckid' is used for all cases. Real World
1146      * examples disagree -Marcus,990216.
1147      */
1148
1149     srchCkId = 0;
1150     srchType = 0;
1151
1152     /* find_chunk looks for 'ckid' */
1153     if (uFlags & MMIO_FINDCHUNK)
1154         srchCkId = lpck->ckid;
1155
1156     /* find_riff and find_list look for 'fccType' */
1157     if (uFlags & MMIO_FINDLIST)
1158     {
1159         srchCkId = FOURCC_LIST;
1160         srchType = lpck->fccType;
1161     }
1162
1163     if (uFlags & MMIO_FINDRIFF)
1164     {
1165         srchCkId = FOURCC_RIFF;
1166         srchType = lpck->fccType;
1167     }
1168
1169     TRACE("searching for %4.4s.%4.4s\n",
1170           (LPCSTR)&srchCkId, srchType ? (LPCSTR)&srchType : "any");
1171
1172     while (TRUE)
1173     {
1174         LONG ix;
1175
1176         ix = mmioRead(hmmio, (LPSTR)lpck, 3 * sizeof(DWORD));
1177         if (ix < 2*sizeof(DWORD))
1178         {
1179             mmioSeek(hmmio, dwOldPos, SEEK_SET);
1180             WARN("return ChunkNotFound\n");
1181             return MMIOERR_CHUNKNOTFOUND;
1182         }
1183
1184         lpck->dwDataOffset = dwOldPos + 2 * sizeof(DWORD);
1185         TRACE("ckid=%4.4s fcc=%4.4s cksize=%08X !\n",
1186               (LPCSTR)&lpck->ckid,
1187               srchType ? (LPCSTR)&lpck->fccType:"<na>",
1188               lpck->cksize);
1189         if ( (!srchCkId || (srchCkId == lpck->ckid)) &&
1190              (!srchType || (srchType == lpck->fccType)) )
1191             break;
1192
1193         dwOldPos = lpck->dwDataOffset + ((lpck->cksize + 1) & ~1);
1194         mmioSeek(hmmio, dwOldPos, SEEK_SET);
1195     }
1196
1197     lpck->dwFlags = 0;
1198     /* If we were looking for RIFF/LIST chunks, the final file position
1199      * is after the chunkid. If we were just looking for the chunk
1200      * it is after the cksize. So add 4 in RIFF/LIST case.
1201      */
1202     if (lpck->ckid == FOURCC_RIFF || lpck->ckid == FOURCC_LIST)
1203         mmioSeek(hmmio, lpck->dwDataOffset + sizeof(DWORD), SEEK_SET);
1204     else
1205     {
1206         mmioSeek(hmmio, lpck->dwDataOffset, SEEK_SET);
1207         lpck->fccType = 0;
1208     }
1209     TRACE("lpck: ckid=%.4s, cksize=%d, dwDataOffset=%d fccType=%08X (%.4s)!\n",
1210           (LPSTR)&lpck->ckid, lpck->cksize, lpck->dwDataOffset,
1211           lpck->fccType, srchType?(LPSTR)&lpck->fccType:"");
1212     return MMSYSERR_NOERROR;
1213 }
1214
1215 /**************************************************************************
1216  *                              mmioAscend              [WINMM.@]
1217  */
1218 MMRESULT WINAPI mmioAscend(HMMIO hmmio, LPMMCKINFO lpck, UINT uFlags)
1219 {
1220     TRACE("(%p, %p, %04X);\n", hmmio, lpck, uFlags);
1221
1222     if (lpck->dwFlags & MMIO_DIRTY) {
1223         DWORD   dwOldPos, dwNewSize;
1224
1225         TRACE("Chunk is dirty, checking if chunk's size is correct\n");
1226         dwOldPos = mmioSeek(hmmio, 0, SEEK_CUR);
1227         TRACE("dwOldPos=%d lpck->dwDataOffset = %d\n", dwOldPos, lpck->dwDataOffset);
1228         dwNewSize = dwOldPos - lpck->dwDataOffset;
1229         if (dwNewSize != lpck->cksize) {
1230             TRACE("Nope: lpck->cksize=%d dwNewSize=%d\n", lpck->cksize, dwNewSize);
1231             lpck->cksize = dwNewSize;
1232
1233             /* pad odd size with 0 */
1234             if (dwNewSize & 1) {
1235                 char ch = 0;
1236                 mmioWrite(hmmio, &ch, 1);
1237             }
1238             mmioSeek(hmmio, lpck->dwDataOffset - sizeof(DWORD), SEEK_SET);
1239             mmioWrite(hmmio, (LPSTR)&dwNewSize, sizeof(DWORD));
1240         }
1241         lpck->dwFlags = 0;
1242     }
1243
1244     mmioSeek(hmmio, lpck->dwDataOffset + ((lpck->cksize + 1) & ~1), SEEK_SET);
1245
1246     return MMSYSERR_NOERROR;
1247 }
1248
1249 /**************************************************************************
1250  *                      mmioCreateChunk                         [WINMM.@]
1251  */
1252 MMRESULT WINAPI mmioCreateChunk(HMMIO hmmio, MMCKINFO* lpck, UINT uFlags)
1253 {
1254     DWORD       dwOldPos;
1255     LONG        size;
1256     LONG        ix;
1257
1258     TRACE("(%p, %p, %04X);\n", hmmio, lpck, uFlags);
1259
1260     dwOldPos = mmioSeek(hmmio, 0, SEEK_CUR);
1261     TRACE("dwOldPos=%d\n", dwOldPos);
1262
1263     if (uFlags == MMIO_CREATELIST)
1264         lpck->ckid = FOURCC_LIST;
1265     else if (uFlags == MMIO_CREATERIFF)
1266         lpck->ckid = FOURCC_RIFF;
1267
1268     TRACE("ckid=%.4s\n", (LPSTR)&lpck->ckid);
1269
1270     size = 2 * sizeof(DWORD);
1271     lpck->dwDataOffset = dwOldPos + size;
1272
1273     if (lpck->ckid == FOURCC_RIFF || lpck->ckid == FOURCC_LIST)
1274         size += sizeof(DWORD);
1275     lpck->dwFlags = MMIO_DIRTY;
1276
1277     ix = mmioWrite(hmmio, (LPSTR)lpck, size);
1278     TRACE("after mmioWrite ix = %d req = %d, errno = %d\n", ix, size, errno);
1279     if (ix < size) {
1280         mmioSeek(hmmio, dwOldPos, SEEK_SET);
1281         WARN("return CannotWrite\n");
1282         return MMIOERR_CANNOTWRITE;
1283     }
1284
1285     return MMSYSERR_NOERROR;
1286 }
1287
1288 /**************************************************************************
1289  *                              mmioRenameA                     [WINMM.@]
1290  */
1291 MMRESULT WINAPI mmioRenameA(LPCSTR szFileName, LPCSTR szNewFileName,
1292                             const MMIOINFO* lpmmioinfo, DWORD dwFlags)
1293 {
1294     struct IOProcList*  ioProc = NULL;
1295     struct IOProcList   tmp;
1296     FOURCC              fcc;
1297
1298     TRACE("('%s', '%s', %p, %08X);\n",
1299           debugstr_a(szFileName), debugstr_a(szNewFileName), lpmmioinfo, dwFlags);
1300
1301     /* If both params are NULL, then parse the file name */
1302     if (lpmmioinfo && lpmmioinfo->fccIOProc == 0 && lpmmioinfo->pIOProc == NULL)
1303     {
1304         fcc = MMIO_ParseExtA(szFileName);
1305         if (fcc) ioProc = MMIO_FindProcNode(fcc);
1306     }
1307
1308     /* Handle any unhandled/error case from above. Assume DOS file */
1309     if (!lpmmioinfo || (lpmmioinfo->fccIOProc == 0 && lpmmioinfo->pIOProc == NULL && ioProc == NULL))
1310         ioProc = MMIO_FindProcNode(FOURCC_DOS);
1311     /* if just the four character code is present, look up IO proc */
1312     else if (lpmmioinfo->pIOProc == NULL)
1313         ioProc = MMIO_FindProcNode(lpmmioinfo->fccIOProc);
1314     else /* use relevant ioProc */
1315     {
1316         ioProc = &tmp;
1317         tmp.fourCC = lpmmioinfo->fccIOProc;
1318         tmp.pIOProc = lpmmioinfo->pIOProc;
1319         tmp.is_unicode = FALSE;
1320         tmp.count = 1;
1321     }
1322
1323     /* FIXME: should we actually pass lpmmioinfo down the drain ???
1324      * or make a copy of it because it's const ???
1325      */
1326     return send_message(ioProc, (MMIOINFO*)lpmmioinfo, MMIOM_RENAME,
1327                         (LPARAM)szFileName, (LPARAM)szNewFileName, FALSE);
1328 }
1329
1330 /**************************************************************************
1331  *                              mmioRenameW                     [WINMM.@]
1332  */
1333 MMRESULT WINAPI mmioRenameW(LPCWSTR szFileName, LPCWSTR szNewFileName,
1334                             const MMIOINFO* lpmmioinfo, DWORD dwFlags)
1335 {
1336     LPSTR       szFn = NULL;
1337     LPSTR       sznFn = NULL;
1338     UINT        ret = MMSYSERR_NOMEM;
1339     INT         len;
1340
1341     if (szFileName)
1342     {
1343         len = WideCharToMultiByte( CP_ACP, 0, szFileName, -1, NULL, 0, NULL, NULL );
1344         szFn = HeapAlloc( GetProcessHeap(), 0, len );
1345         if (!szFn) goto done;
1346         WideCharToMultiByte( CP_ACP, 0, szFileName, -1, szFn, len, NULL, NULL );
1347     }
1348     if (szNewFileName)
1349     {
1350         len = WideCharToMultiByte( CP_ACP, 0, szNewFileName, -1, NULL, 0, NULL, NULL );
1351         sznFn = HeapAlloc( GetProcessHeap(), 0, len );
1352         if (!sznFn) goto done;
1353         WideCharToMultiByte( CP_ACP, 0, szNewFileName, -1, sznFn, len, NULL, NULL );
1354     }
1355
1356     ret = mmioRenameA(szFn, sznFn, lpmmioinfo, dwFlags);
1357
1358 done:
1359     HeapFree(GetProcessHeap(),0,szFn);
1360     HeapFree(GetProcessHeap(),0,sznFn);
1361     return ret;
1362 }