mmio.c

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/*
 * MMIO functions
 *
 * Copyright 1998 Andrew Taylor
 * Copyright 1998 Ove Kåven
 * Copyright 2000,2002 Eric Pouech
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 */
 
/* Still to be done:
 *  + correct handling of global/local IOProcs (and temporary IOProcs)
 *  + mode of mmio objects is not used (read vs write vs readwrite)
 *  + thread safeness
 *      + 32 A <=> W message mapping
 */
 
#include "winemm.h"
 
WINE_DEFAULT_DEBUG_CHANNEL(mmio);
 
static WINE_MMIO *MMIOList;
 
/**************************************************************************
 *                  mmioDosIOProc                   [internal]
 */
static LRESULT CALLBACK mmioDosIOProc(LPMMIOINFO lpmmioinfo, UINT uMessage,
                      LPARAM lParam1, LPARAM lParam2)
{
    LRESULT ret = MMSYSERR_NOERROR;
 
    TRACE("(%p, %X, 0x%lx, 0x%lx);\n", lpmmioinfo, uMessage, lParam1, lParam2);
 
    switch (uMessage) {
    case MMIOM_OPEN:
    {
        /* Parameters:
         * lParam1 = szFileName parameter from mmioOpen
         * lParam2 = reserved
         * Returns: zero on success, error code on error
         * NOTE: lDiskOffset automatically set to zero
         */
        LPCSTR      szFileName = (LPCSTR)lParam1;
 
        if (lpmmioinfo->dwFlags & MMIO_GETTEMP) {
        FIXME("MMIO_GETTEMP not implemented\n");
        return MMIOERR_CANNOTOPEN;
        }
 
        /* if filename NULL, assume open file handle in adwInfo[0] */
        if (szFileName) {
                OFSTRUCT    ofs;
                lpmmioinfo->adwInfo[0] = (DWORD)OpenFile(szFileName, &ofs, lpmmioinfo->dwFlags & 0xFFFF);
            }
        if (lpmmioinfo->adwInfo[0] == (DWORD)HFILE_ERROR)
        ret = MMIOERR_CANNOTOPEN;
    }
    break;
 
    case MMIOM_CLOSE:
    /* Parameters:
     * lParam1 = wFlags parameter from mmioClose
     * lParam2 = unused
     * Returns: zero on success, error code on error
     */
    if (!(lParam1 & MMIO_FHOPEN))
        _lclose((HFILE)lpmmioinfo->adwInfo[0]);
    break;
 
    case MMIOM_READ:
    /* Parameters:
     * lParam1 = huge pointer to read buffer
     * lParam2 = number of bytes to read
     * Returns: number of bytes read, 0 for EOF, -1 for error (error code
     *     in wErrorRet)
     */
    ret = _lread((HFILE)lpmmioinfo->adwInfo[0], (HPSTR)lParam1, (LONG)lParam2);
    if (ret != -1)
        lpmmioinfo->lDiskOffset += ret;
 
    break;
 
    case MMIOM_WRITE:
    case MMIOM_WRITEFLUSH:
    /* no internal buffering, so WRITEFLUSH handled same as WRITE */
 
    /* Parameters:
     * lParam1 = huge pointer to write buffer
     * lParam2 = number of bytes to write
     * Returns: number of bytes written, -1 for error (error code in
     *      wErrorRet)
     */
    ret = _hwrite((HFILE)lpmmioinfo->adwInfo[0], (HPSTR)lParam1, (LONG)lParam2);
    if (ret != -1)
        lpmmioinfo->lDiskOffset += ret;
    break;
 
    case MMIOM_SEEK:
    /* Parameters:
     * lParam1 = new position
     * lParam2 = from whence to seek (SEEK_SET, SEEK_CUR, SEEK_END)
     * Returns: new file postion, -1 on error
     */
    ret = _llseek((HFILE)lpmmioinfo->adwInfo[0], (LONG)lParam1, (LONG)lParam2);
    if (ret != -1)
        lpmmioinfo->lDiskOffset = ret;
    return ret;
 
    case MMIOM_RENAME:
    /* Parameters:
     * lParam1 = old name
     * lParam2 = new name
     * Returns: zero on success, non-zero on failure
     */
     if (!MoveFileA((const char*)lParam1, (const char*)lParam2))
         ret = MMIOERR_FILENOTFOUND;
     break;
 
    default:
    FIXME("unexpected message %u\n", uMessage);
    return 0;
    }
 
    return ret;
}
 
/**************************************************************************
 *                  mmioMemIOProc                   [internal]
 */
static LRESULT CALLBACK mmioMemIOProc(LPMMIOINFO lpmmioinfo, UINT uMessage,
                      LPARAM lParam1, LPARAM lParam2)
{
    TRACE("(%p,0x%04x,0x%08lx,0x%08lx)\n", lpmmioinfo, uMessage, lParam1, lParam2);
 
    switch (uMessage) {
 
    case MMIOM_OPEN:
    /* Parameters:
     * lParam1 = filename (must be NULL)
     * lParam2 = reserved
     * Returns: zero on success, error code on error
     * NOTE: lDiskOffset automatically set to zero
     */
    /* FIXME: io proc shouldn't change it */
    if (!(lpmmioinfo->dwFlags & MMIO_CREATE))
        lpmmioinfo->pchEndRead = lpmmioinfo->pchEndWrite;
        lpmmioinfo->adwInfo[0] = HFILE_ERROR;
    return 0;
 
    case MMIOM_CLOSE:
    /* Parameters:
     * lParam1 = wFlags parameter from mmioClose
     * lParam2 = unused
     * Returns: zero on success, error code on error
     */
    return 0;
 
    case MMIOM_READ:
    /* Parameters:
     * lParam1 = huge pointer to read buffer
     * lParam2 = number of bytes to read
     * Returns: number of bytes read, 0 for EOF, -1 for error (error code
     *     in wErrorRet)
     * NOTE: lDiskOffset should be updated
     */
    FIXME("MMIOM_READ on memory files should not occur, buffer may be lost!\n");
    return 0;
 
    case MMIOM_WRITE:
    case MMIOM_WRITEFLUSH:
    /* no internal buffering, so WRITEFLUSH handled same as WRITE */
 
    /* Parameters:
     * lParam1 = huge pointer to write buffer
     * lParam2 = number of bytes to write
     * Returns: number of bytes written, -1 for error (error code in
     *      wErrorRet)
     * NOTE: lDiskOffset should be updated
     */
    FIXME("MMIOM_WRITE on memory files should not occur, buffer may be lost!\n");
    return 0;
 
    case MMIOM_SEEK:
    /* Parameters:
     * lParam1 = new position
     * lParam2 = from whence to seek (SEEK_SET, SEEK_CUR, SEEK_END)
     * Returns: new file postion, -1 on error
     * NOTE: lDiskOffset should be updated
     */
    FIXME("MMIOM_SEEK on memory files should not occur, buffer may be lost!\n");
    return -1;
 
    default:
    FIXME("unexpected message %u\n", uMessage);
    return 0;
    }
}
 
/* This array will be the entire list for most apps 
 * Note that temporary ioProcs will be stored with a 0 fourCC code
 */
 
static struct IOProcList defaultProcs[] = {
    {&defaultProcs[1], FOURCC_DOS, (LPMMIOPROC)mmioDosIOProc, FALSE, 0},
    {NULL,             FOURCC_MEM, (LPMMIOPROC)mmioMemIOProc, FALSE, 0},
};
 
static struct IOProcList*   pIOProcListAnchor = &defaultProcs[0];
 
/****************************************************************
 *          MMIO_FindProcNode           [INTERNAL]
 *
 * Finds the ProcList node associated with a given FOURCC code.
 */
static struct IOProcList*   MMIO_FindProcNode(FOURCC fccIOProc)
{
    struct IOProcList*  pListNode;
 
    for (pListNode = pIOProcListAnchor; pListNode; pListNode = pListNode->pNext) {
    if (pListNode->fourCC == fccIOProc) {
        return pListNode;
    }
    }
    return NULL;
}
 
/****************************************************************
 *          MMIO_InstallIOProc          [INTERNAL]
 */
static LPMMIOPROC MMIO_InstallIOProc(FOURCC fccIOProc, LPMMIOPROC pIOProc,
                                     DWORD dwFlags, BOOL is_unicode)
{
    LPMMIOPROC          lpProc = NULL;
    struct IOProcList*  pListNode;
    struct IOProcList** ppListNode;
 
    TRACE("(%08x, %p, %08X, %s)\n", fccIOProc, pIOProc, dwFlags, is_unicode ? "unicode" : "ansi");
 
    if (dwFlags & MMIO_GLOBALPROC)
    FIXME("Global procedures not implemented\n");
 
    /* just handle the known procedures for now */
    switch (dwFlags & (MMIO_INSTALLPROC|MMIO_REMOVEPROC|MMIO_FINDPROC)) {
    case MMIO_INSTALLPROC:
    /* Create new entry for the IOProc list */
    pListNode = HeapAlloc(GetProcessHeap(), 0, sizeof(*pListNode));
    if (pListNode) {
        /* Fill in this node */
        pListNode->fourCC = fccIOProc;
        pListNode->pIOProc = pIOProc;
        pListNode->is_unicode = is_unicode;
        pListNode->count = 0;
 
        /* Stick it on the end of the list */
        pListNode->pNext = pIOProcListAnchor;
        pIOProcListAnchor = pListNode;
 
        /* Return this IOProc - that's how the caller knows we succeeded */
        lpProc = pIOProc;
    }
    break;
 
    case MMIO_REMOVEPROC:
    /*
     * Search for the node that we're trying to remove
         * We search for a matching fourCC code if it's non null, or the proc
         * address otherwise
         * note that this method won't find the first item on the list, but
     * since the first two items on this list are ones we won't
     * let the user delete anyway, that's okay
     */
    ppListNode = &pIOProcListAnchor;
    while ((*ppListNode) && 
               ((fccIOProc != 0) ? 
                (*ppListNode)->fourCC != fccIOProc : 
                (*ppListNode)->pIOProc != pIOProc))
        ppListNode = &((*ppListNode)->pNext);
 
    if (*ppListNode) { /* found it */
        /* FIXME: what should be done if an open mmio object uses this proc ?
         * shall we return an error, nuke the mmio object ?
         */
        if ((*ppListNode)->count) {
        ERR("Cannot remove a mmIOProc while in use\n");
        break;
        }
        /* remove it, but only if it isn't builtin */
        if ((*ppListNode) >= defaultProcs &&
        (*ppListNode) < defaultProcs + sizeof(defaultProcs) / sizeof(defaultProcs[0])) {
        WARN("Tried to remove built-in mmio proc. Skipping\n");
        } else {
        /* Okay, nuke it */
        struct IOProcList*  ptmpNode = *ppListNode;
        lpProc = (*ppListNode)->pIOProc;
        *ppListNode = (*ppListNode)->pNext;
        HeapFree(GetProcessHeap(), 0, ptmpNode);
        }
    }
    break;
 
    case MMIO_FINDPROC:
    if ((pListNode = MMIO_FindProcNode(fccIOProc))) {
        lpProc = pListNode->pIOProc;
    }
    break;
    }
 
    return lpProc;
}
 
/****************************************************************
 *          send_message                [INTERNAL]
 */
static LRESULT  send_message(struct IOProcList* ioProc, LPMMIOINFO mmioinfo,
                             DWORD wMsg, LPARAM lParam1,
                             LPARAM lParam2, BOOL is_unicode)
{
    LRESULT         result = MMSYSERR_ERROR;
    LPARAM      lp1 = lParam1, lp2 = lParam2;
 
    if (!ioProc) {
    ERR("ioProc NULL\n");
    return MMSYSERR_INVALPARAM;
    }
 
    if (ioProc->is_unicode != is_unicode) {
        /* map (lParam1, lParam2) into (lp1, lp2) 32 A<=>W */
        FIXME("NIY 32 A<=>W mapping\n");
    }
    result = (ioProc->pIOProc)((LPSTR)mmioinfo, wMsg, lp1, lp2);
 
#if 0
    if (ioProc->is_unicode != is_unicode) {
        /* unmap (lParam1, lParam2) into (lp1, lp2) 32 A<=>W */
    }
#endif
 
    return result;
}
 
/**************************************************************************
 *                  MMIO_ParseExtA              [internal]
 *
 * Parses a filename for the extension.
 *
 * RETURNS
 *  The FOURCC code for the extension if found, else 0.
 */
static FOURCC MMIO_ParseExtA(LPCSTR szFileName)
{
    /* Filenames are of the form file.ext{+ABC}
       For now, we take the last '+' if present */
 
    FOURCC ret = 0;
 
    /* Note that ext{Start,End} point to the . and + respectively */
    LPSTR extEnd;
    LPSTR extStart;
 
    TRACE("(%s)\n", debugstr_a(szFileName));
 
    if (!szFileName)
    return ret;
 
    /* Find the last '.' */
    extStart = strrchr(szFileName,'.');
 
    if (!extStart) {
         ERR("No . in szFileName: %s\n", debugstr_a(szFileName));
    } else {
        CHAR ext[5];
 
        /* Find the '+' afterwards */
        extEnd = strchr(extStart,'+');
        if (extEnd) {
 
            if (extEnd - extStart - 1 > 4)
                WARN("Extension length > 4\n");
            lstrcpynA(ext, extStart + 1, min(extEnd-extStart,5));
 
        } else {
            /* No + so just an extension */
            if (strlen(extStart) > 4) {
                WARN("Extension length > 4\n");
            }
            lstrcpynA(ext, extStart + 1, 5);
        }
        TRACE("Got extension: %s\n", debugstr_a(ext));
 
        /* FOURCC codes identifying file-extensions must be uppercase */
        ret = mmioStringToFOURCCA(ext, MMIO_TOUPPER);
    }
    return ret;
}
 
/**************************************************************************
 *              MMIO_Get            [internal]
 *
 * Retrieves the mmio object from current process
 */
static LPWINE_MMIO      MMIO_Get(HMMIO h)
{
    LPWINE_MMIO     wm = NULL;
 
    EnterCriticalSection(&WINMM_cs);
    for (wm = MMIOList; wm; wm = wm->lpNext) {
    if (wm->info.hmmio == h)
        break;
    }
    LeaveCriticalSection(&WINMM_cs);
    return wm;
}
 
/**************************************************************************
 *              MMIO_Create         [internal]
 *
 * Creates an internal representation for a mmio instance
 */
static  LPWINE_MMIO     MMIO_Create(void)
{
    static  WORD    MMIO_counter = 0;
    LPWINE_MMIO     wm;
 
    wm = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(WINE_MMIO));
    if (wm) {
    EnterCriticalSection(&WINMM_cs);
        /* lookup next unallocated WORD handle, with a non NULL value */
    while (++MMIO_counter == 0 || MMIO_Get((HMMIO)(ULONG_PTR)MMIO_counter));
    wm->info.hmmio = (HMMIO)(ULONG_PTR)MMIO_counter;
    wm->lpNext = MMIOList;
    MMIOList = wm;
    LeaveCriticalSection(&WINMM_cs);
    }
    return wm;
}
 
/**************************************************************************
 *              MMIO_Destroy            [internal]
 *-
 * Destroys an internal representation for a mmio instance
 */
static  BOOL        MMIO_Destroy(LPWINE_MMIO wm)
{
    LPWINE_MMIO*    m;
 
    EnterCriticalSection(&WINMM_cs);
    /* search for the matching one... */
    m = &MMIOList;
    while (*m && *m != wm) m = &(*m)->lpNext;
    /* ...and destroy */
    if (*m) {
    *m = (*m)->lpNext;
    HeapFree(GetProcessHeap(), 0, wm);
    wm = NULL;
    }
    LeaveCriticalSection(&WINMM_cs);
    return wm ? FALSE : TRUE;
}
 
/****************************************************************
 *              MMIO_Flush          [INTERNAL]
 */
static  MMRESULT MMIO_Flush(WINE_MMIO* wm, UINT uFlags)
{
    if (wm->info.cchBuffer && (wm->info.fccIOProc != FOURCC_MEM)) {
    /* not quite sure what to do here, but I'll guess */
    if (wm->info.dwFlags & MMIO_DIRTY) {
            /* FIXME: error handling */
        send_message(wm->ioProc, &wm->info, MMIOM_SEEK, wm->info.lBufOffset, SEEK_SET, FALSE);
        send_message(wm->ioProc, &wm->info, MMIOM_WRITE,
                         (LPARAM)wm->info.pchBuffer,
                         wm->info.pchNext - wm->info.pchBuffer, FALSE);
    }
    if (uFlags & MMIO_EMPTYBUF)
        wm->info.pchNext = wm->info.pchEndRead = wm->info.pchBuffer;
    }
    wm->info.dwFlags &= ~MMIO_DIRTY;
 
    return MMSYSERR_NOERROR;
}
 
/***************************************************************************
 *              MMIO_GrabNextBuffer         [INTERNAL]
 */
static LONG MMIO_GrabNextBuffer(LPWINE_MMIO wm, int for_read)
{
    LONG    size = wm->info.cchBuffer;
 
    TRACE("bo=%x do=%x of=%lx\n",
      wm->info.lBufOffset, wm->info.lDiskOffset,
      send_message(wm->ioProc, &wm->info, MMIOM_SEEK, 0, SEEK_CUR, FALSE));
 
    wm->info.lBufOffset = wm->info.lDiskOffset;
    wm->info.pchNext = wm->info.pchBuffer;
    wm->info.pchEndRead = wm->info.pchBuffer;
    wm->info.pchEndWrite = wm->info.pchBuffer + wm->info.cchBuffer;
 
    wm->bBufferLoaded = TRUE;
    if (for_read) {
    size = send_message(wm->ioProc, &wm->info, MMIOM_READ,
                            (LPARAM)wm->info.pchBuffer, size, FALSE);
    if (size > 0)
        wm->info.pchEndRead += size;
        else
            wm->bBufferLoaded = FALSE;
    }
 
    return size;
}
 
/***************************************************************************
 *              MMIO_SetBuffer              [INTERNAL]
 */
static MMRESULT MMIO_SetBuffer(WINE_MMIO* wm, void* pchBuffer, LONG cchBuffer,
                   UINT uFlags)
{
    TRACE("(%p %p %d %u)\n", wm, pchBuffer, cchBuffer, uFlags);
 
    if (cchBuffer > 0xFFFF)
    WARN("Untested handling of huge mmio buffers (%d >= 64k)\n", cchBuffer);
 
    if (MMIO_Flush(wm, 0) != MMSYSERR_NOERROR)
    return MMIOERR_CANNOTWRITE;
 
    /* free previous buffer if allocated */
    if (wm->info.dwFlags & MMIO_ALLOCBUF) {
        HeapFree(GetProcessHeap(), 0, wm->info.pchBuffer);
        wm->info.pchBuffer = NULL;
    wm->info.dwFlags &= ~MMIO_ALLOCBUF;
    }
 
    if (pchBuffer) {
        wm->info.pchBuffer = pchBuffer;
    } else if (cchBuffer) {
    if (!(wm->info.pchBuffer = HeapAlloc(GetProcessHeap(), 0, cchBuffer)))
        return MMIOERR_OUTOFMEMORY;
    wm->info.dwFlags |= MMIO_ALLOCBUF;
    } else {
    wm->info.pchBuffer = NULL;
    }
 
    wm->info.cchBuffer = cchBuffer;
    wm->info.pchNext = wm->info.pchBuffer;
    wm->info.pchEndRead = wm->info.pchBuffer;
    wm->info.pchEndWrite = wm->info.pchBuffer + cchBuffer;
    wm->info.lBufOffset = wm->info.lDiskOffset;
    wm->bBufferLoaded = FALSE;
 
    return MMSYSERR_NOERROR;
}
 
/**************************************************************************
 *          MMIO_Open                   [internal]
 */
static HMMIO MMIO_Open(LPSTR szFileName, MMIOINFO* refmminfo, DWORD dwOpenFlags, BOOL is_unicode)
{
    LPWINE_MMIO     wm;
    MMIOINFO        mmioinfo;
 
    TRACE("('%s', %p, %08X, %s);\n", szFileName, refmminfo, dwOpenFlags, is_unicode ? "unicode" : "ansi");
 
    if (!refmminfo) {
        refmminfo = &mmioinfo;
 
    mmioinfo.fccIOProc = 0;
    mmioinfo.pIOProc = NULL;
    mmioinfo.pchBuffer = NULL;
    mmioinfo.cchBuffer = 0;
        is_unicode = FALSE;
    }
 
    if (dwOpenFlags & (MMIO_PARSE|MMIO_EXIST)) {
    char    buffer[MAX_PATH];
 
    if (!szFileName)
        return (HMMIO)FALSE;
    if (GetFullPathNameA(szFileName, sizeof(buffer), buffer, NULL) >= sizeof(buffer))
        return (HMMIO)FALSE;
    if ((dwOpenFlags & MMIO_EXIST) && (GetFileAttributesA(buffer) == INVALID_FILE_ATTRIBUTES))
        return (HMMIO)FALSE;
    strcpy(szFileName, buffer);
    return (HMMIO)TRUE;
    }
 
    if ((wm = MMIO_Create()) == NULL)
    return 0;
 
    /* If both params are NULL, then parse the file name if available */
    if (refmminfo->fccIOProc == 0 && refmminfo->pIOProc == NULL) {
    wm->info.fccIOProc = MMIO_ParseExtA(szFileName);
    /* Handle any unhandled/error case. Assume DOS file */
    if (wm->info.fccIOProc == 0)
        wm->info.fccIOProc = FOURCC_DOS;
    if (!(wm->ioProc = MMIO_FindProcNode(wm->info.fccIOProc))) {
        /* If not found, retry with FOURCC_DOS */
        wm->info.fccIOProc = FOURCC_DOS;
        if (!(wm->ioProc = MMIO_FindProcNode(wm->info.fccIOProc)))
        goto error2;
    }
    wm->bTmpIOProc = FALSE;
    }
    /* if just the four character code is present, look up IO proc */
    else if (refmminfo->pIOProc == NULL) {
    wm->info.fccIOProc = refmminfo->fccIOProc;
    if (!(wm->ioProc = MMIO_FindProcNode(wm->info.fccIOProc))) goto error2;
    wm->bTmpIOProc = FALSE;
    }
    /* if IO proc specified, use it and specified four character code */
    else {
    wm->info.fccIOProc = refmminfo->fccIOProc;
    MMIO_InstallIOProc(wm->info.fccIOProc, refmminfo->pIOProc,
                           MMIO_INSTALLPROC, is_unicode);
    if (!(wm->ioProc = MMIO_FindProcNode(wm->info.fccIOProc))) goto error2;
    assert(wm->ioProc->pIOProc == refmminfo->pIOProc);
    wm->bTmpIOProc = TRUE;
    }
 
    wm->ioProc->count++;
    wm->info.dwFlags = dwOpenFlags;
 
    if (dwOpenFlags & MMIO_ALLOCBUF) {
    refmminfo->wErrorRet = MMIO_SetBuffer(wm, refmminfo->pchBuffer,
        refmminfo->cchBuffer ? refmminfo->cchBuffer : MMIO_DEFAULTBUFFER, 0);
    if (refmminfo->wErrorRet != MMSYSERR_NOERROR)
        goto error1;
    } else {
        refmminfo->wErrorRet = MMIO_SetBuffer(wm, refmminfo->pchBuffer, refmminfo->cchBuffer, 0);
    if (refmminfo->wErrorRet != MMSYSERR_NOERROR)
        goto error1;
    }
 
    if (wm->info.fccIOProc == FOURCC_MEM && !(wm->info.dwFlags & MMIO_ALLOCBUF))
        wm->bBufferLoaded = TRUE;
 
    /* see mmioDosIOProc for that one */
    wm->info.adwInfo[0] = refmminfo->adwInfo[0];
 
    /* call IO proc to actually open file */
    refmminfo->wErrorRet = send_message(wm->ioProc, &wm->info, MMIOM_OPEN,
                                        (LPARAM)szFileName, 0, FALSE);
 
    /* grab file size, when possible (FIXME: not 64 bit safe) */
    wm->dwFileSize = GetFileSize((HANDLE)(ULONG_PTR)wm->info.adwInfo[0], NULL);
 
    if (refmminfo->wErrorRet == 0)
    return wm->info.hmmio;
 error1:
    if (wm->ioProc) wm->ioProc->count--;
 error2:
    MMIO_Destroy(wm);
    return 0;
}
 
/**************************************************************************
 *              mmioOpenW               [WINMM.@]
 */
HMMIO WINAPI mmioOpenW(LPWSTR szFileName, MMIOINFO* lpmmioinfo,
               DWORD dwOpenFlags)
{
    HMMIO   ret;
    LPSTR   szFn = NULL;
 
    if (szFileName)
    {
        INT     len = WideCharToMultiByte( CP_ACP, 0, szFileName, -1, NULL, 0, NULL, NULL );
        szFn = HeapAlloc( GetProcessHeap(), 0, len );
        if (!szFn) return NULL;
        WideCharToMultiByte( CP_ACP, 0, szFileName, -1, szFn, len, NULL, NULL );
    }
 
    ret = MMIO_Open(szFn, lpmmioinfo, dwOpenFlags, TRUE);
 
    HeapFree(GetProcessHeap(), 0, szFn);
    return ret;
}
 
/**************************************************************************
 *              mmioOpenA               [WINMM.@]
 */
HMMIO WINAPI mmioOpenA(LPSTR szFileName, MMIOINFO* lpmmioinfo,
               DWORD dwOpenFlags)
{
    return  MMIO_Open(szFileName, lpmmioinfo, dwOpenFlags, FALSE);
}
 
/**************************************************************************
 *              mmioClose           [WINMM.@]
 */
MMRESULT WINAPI mmioClose(HMMIO hmmio, UINT uFlags)
{
    LPWINE_MMIO wm;
    MMRESULT    result;
 
    TRACE("(%p, %04X);\n", hmmio, uFlags);
 
    if ((wm = MMIO_Get(hmmio)) == NULL)
    return MMSYSERR_INVALHANDLE;
 
    if ((result = MMIO_Flush(wm, 0)) != MMSYSERR_NOERROR)
    return result;
 
    result = send_message(wm->ioProc, &wm->info, MMIOM_CLOSE, uFlags, 0, FALSE);
 
    MMIO_SetBuffer(wm, NULL, 0, 0);
 
    wm->ioProc->count--;
 
    if (wm->bTmpIOProc)
    MMIO_InstallIOProc(wm->info.fccIOProc, wm->ioProc->pIOProc,
                           MMIO_REMOVEPROC, wm->ioProc->is_unicode);
 
    MMIO_Destroy(wm);
 
    return result;
}
 
/**************************************************************************
 *              mmioRead            [WINMM.@]
 */
LONG WINAPI mmioRead(HMMIO hmmio, HPSTR pch, LONG cch)
{
    LPWINE_MMIO wm;
    LONG    count;
 
    TRACE("(%p, %p, %d);\n", hmmio, pch, cch);
 
    if ((wm = MMIO_Get(hmmio)) == NULL)
    return -1;
 
    /* unbuffered case first */
    if (!wm->info.pchBuffer)
    return send_message(wm->ioProc, &wm->info, MMIOM_READ, (LPARAM)pch, cch, FALSE);
 
    /* first try from current buffer */
    if (wm->info.pchNext != wm->info.pchEndRead) {
    count = wm->info.pchEndRead - wm->info.pchNext;
    if (count > cch || count < 0) count = cch;
    memcpy(pch, wm->info.pchNext, count);
    wm->info.pchNext += count;
    pch += count;
    cch -= count;
    } else
    count = 0;
 
    if (cch && (wm->info.fccIOProc != FOURCC_MEM)) {
    assert(wm->info.cchBuffer);
 
    while (cch) {
        LONG size;
 
        size = MMIO_GrabNextBuffer(wm, TRUE);
        if (size <= 0) break;
        if (size > cch) size = cch;
        memcpy(pch, wm->info.pchBuffer, size);
        wm->info.pchNext += size;
        pch += size;
        cch -= size;
        count += size;
    }
    }
 
    TRACE("count=%d\n", count);
    return count;
}
 
/**************************************************************************
 *              mmioWrite           [WINMM.@]
 */
LONG WINAPI mmioWrite(HMMIO hmmio, HPCSTR pch, LONG cch)
{
    LPWINE_MMIO wm;
    LONG    count;
 
    TRACE("(%p, %p, %d);\n", hmmio, pch, cch);
 
    if ((wm = MMIO_Get(hmmio)) == NULL)
    return -1;
 
    if (wm->info.cchBuffer) {
    LONG    bytesW = 0;
 
        count = 0;
        while (cch) {
            if (wm->info.pchNext != wm->info.pchEndWrite) {
                count = wm->info.pchEndWrite - wm->info.pchNext;
                if (count > cch || count < 0) count = cch;
                memcpy(wm->info.pchNext, pch, count);
                wm->info.pchNext += count;
                pch += count;
                cch -= count;
                bytesW += count;
                wm->info.dwFlags |= MMIO_DIRTY;
        } else {
                if (wm->info.fccIOProc == FOURCC_MEM) {
                    if (wm->info.adwInfo[0]) {
                        /* from where would we get the memory handle? */
                        FIXME("memory file expansion not implemented!\n");
                        break;
            } else break;
                }
            }
 
            if (wm->info.pchNext == wm->info.pchEndWrite)
            {
                MMIO_Flush(wm, MMIO_EMPTYBUF);
                MMIO_GrabNextBuffer(wm, FALSE);
            }
            else break;
        }
    count = bytesW;
    } else {
    count = send_message(wm->ioProc, &wm->info, MMIOM_WRITE, (LPARAM)pch, cch, FALSE);
    wm->info.lBufOffset = wm->info.lDiskOffset;
    }
 
    TRACE("bytes written=%d\n", count);
    return count;
}
 
/**************************************************************************
 *              mmioSeek        [WINMM.@]
 */
LONG WINAPI mmioSeek(HMMIO hmmio, LONG lOffset, INT iOrigin)
{
    LPWINE_MMIO wm;
    LONG    offset;
 
    TRACE("(%p, %08X, %d);\n", hmmio, lOffset, iOrigin);
 
    if ((wm = MMIO_Get(hmmio)) == NULL)
    return MMSYSERR_INVALHANDLE;
 
    /* not buffered, direct seek on file */
    if (!wm->info.pchBuffer)
    return send_message(wm->ioProc, &wm->info, MMIOM_SEEK, lOffset, iOrigin, FALSE);
 
    switch (iOrigin) {
    case SEEK_SET:
    offset = lOffset;
    break;
    case SEEK_CUR:
    offset = wm->info.lBufOffset + (wm->info.pchNext - wm->info.pchBuffer) + lOffset;
    break;
    case SEEK_END:
    offset = ((wm->info.fccIOProc == FOURCC_MEM)? wm->info.cchBuffer : wm->dwFileSize) - lOffset;
    break;
    default:
    return -1;
    }
 
    if (offset && offset >= wm->dwFileSize && wm->info.fccIOProc != FOURCC_MEM) {
        /* should check that write mode exists */
        if (MMIO_Flush(wm, 0) != MMSYSERR_NOERROR)
            return -1;
        wm->info.lBufOffset = offset;
        wm->info.pchEndRead = wm->info.pchBuffer;
        wm->info.pchEndWrite = wm->info.pchBuffer + wm->info.cchBuffer;
        if ((wm->info.dwFlags & MMIO_RWMODE) == MMIO_READ) {
            wm->info.lDiskOffset = wm->dwFileSize;
        }
    } else if ((wm->info.cchBuffer > 0) &&
    ((offset < wm->info.lBufOffset) ||
     (offset >= wm->info.lBufOffset + wm->info.cchBuffer) ||
     !wm->bBufferLoaded)) {
        /* stay in same buffer ? */
        /* some memory mapped buffers are defined with -1 as a size */
 
    /* condition to change buffer */
    if ((wm->info.fccIOProc == FOURCC_MEM) ||
        MMIO_Flush(wm, 0) != MMSYSERR_NOERROR ||
        /* this also sets the wm->info.lDiskOffset field */
        send_message(wm->ioProc, &wm->info, MMIOM_SEEK,
                         (offset / wm->info.cchBuffer) * wm->info.cchBuffer,
                         SEEK_SET, FALSE) == -1)
        return -1;
    MMIO_GrabNextBuffer(wm, TRUE);
    }
 
    wm->info.pchNext = wm->info.pchBuffer + (offset - wm->info.lBufOffset);
 
    TRACE("=> %d\n", offset);
    return offset;
}
 
/**************************************************************************
 *              mmioGetInfo         [WINMM.@]
 */
MMRESULT WINAPI mmioGetInfo(HMMIO hmmio, MMIOINFO* lpmmioinfo, UINT uFlags)
{
    LPWINE_MMIO     wm;
 
    TRACE("(%p,%p,0x%08x)\n",hmmio,lpmmioinfo,uFlags);
 
    if ((wm = MMIO_Get(hmmio)) == NULL)
    return MMSYSERR_INVALHANDLE;
 
    *lpmmioinfo = wm->info;
 
    return MMSYSERR_NOERROR;
}
 
/**************************************************************************
 *              mmioSetInfo         [WINMM.@]
 */
MMRESULT WINAPI mmioSetInfo(HMMIO hmmio, const MMIOINFO* lpmmioinfo, UINT uFlags)
{
    LPWINE_MMIO     wm;
 
    TRACE("(%p,%p,0x%08x)\n",hmmio,lpmmioinfo,uFlags);
 
    if ((wm = MMIO_Get(hmmio)) == NULL)
    return MMSYSERR_INVALHANDLE;
 
    /* check pointers coherence */
    if (lpmmioinfo->pchNext < wm->info.pchBuffer ||
    lpmmioinfo->pchNext > wm->info.pchBuffer + wm->info.cchBuffer ||
    lpmmioinfo->pchEndRead < wm->info.pchBuffer ||
    lpmmioinfo->pchEndRead > wm->info.pchBuffer + wm->info.cchBuffer ||
    lpmmioinfo->pchEndWrite < wm->info.pchBuffer ||
    lpmmioinfo->pchEndWrite > wm->info.pchBuffer + wm->info.cchBuffer)
    return MMSYSERR_INVALPARAM;
 
    wm->info.pchNext = lpmmioinfo->pchNext;
    wm->info.pchEndRead = lpmmioinfo->pchEndRead;
 
    return MMSYSERR_NOERROR;
}
 
/**************************************************************************
*               mmioSetBuffer       [WINMM.@]
*/
MMRESULT WINAPI mmioSetBuffer(HMMIO hmmio, LPSTR pchBuffer, LONG cchBuffer, UINT uFlags)
{
    LPWINE_MMIO     wm;
 
    TRACE("(hmmio=%p, pchBuf=%p, cchBuf=%d, uFlags=%#08x)\n",
      hmmio, pchBuffer, cchBuffer, uFlags);
 
    if ((wm = MMIO_Get(hmmio)) == NULL)
    return MMSYSERR_INVALHANDLE;
 
    return MMIO_SetBuffer(wm, pchBuffer, cchBuffer, uFlags);
}
 
/**************************************************************************
 *              mmioFlush           [WINMM.@]
 */
MMRESULT WINAPI mmioFlush(HMMIO hmmio, UINT uFlags)
{
    LPWINE_MMIO     wm;
 
    TRACE("(%p, %04X)\n", hmmio, uFlags);
 
    if ((wm = MMIO_Get(hmmio)) == NULL)
    return MMSYSERR_INVALHANDLE;
 
    return MMIO_Flush(wm, uFlags);
}
 
/**************************************************************************
 *              mmioAdvance         [WINMM.@]
 */
MMRESULT WINAPI mmioAdvance(HMMIO hmmio, MMIOINFO* lpmmioinfo, UINT uFlags)
{
    LPWINE_MMIO     wm;
 
    TRACE("hmmio=%p, lpmmioinfo=%p, uFlags=%04X\n", hmmio, lpmmioinfo, uFlags);
 
    /* NOTE: mmioAdvance16 heavily relies on parameters from lpmmioinfo we're using
     * here. be sure if you change something here to check mmioAdvance16 as well
     */
    if ((wm = MMIO_Get(hmmio)) == NULL)
    return MMSYSERR_INVALHANDLE;
 
    if (!wm->info.cchBuffer)
    return MMIOERR_UNBUFFERED;
 
    if (uFlags != MMIO_READ && uFlags != MMIO_WRITE)
    return MMSYSERR_INVALPARAM;
 
    if (uFlags == MMIO_WRITE && (lpmmioinfo->dwFlags & MMIO_DIRTY))
    {
        send_message(wm->ioProc, &wm->info, MMIOM_SEEK, lpmmioinfo->lBufOffset, SEEK_SET, FALSE);
        send_message(wm->ioProc, &wm->info, MMIOM_WRITE, (LPARAM)lpmmioinfo->pchBuffer,
                     lpmmioinfo->pchNext - lpmmioinfo->pchBuffer, FALSE);
        lpmmioinfo->dwFlags &= ~MMIO_DIRTY;
    }
    if (MMIO_Flush(wm, 0) != MMSYSERR_NOERROR)
    return MMIOERR_CANNOTWRITE;
 
    if (lpmmioinfo) {
    wm->dwFileSize = max(wm->dwFileSize, lpmmioinfo->lBufOffset + 
                             (lpmmioinfo->pchNext - lpmmioinfo->pchBuffer));
    }
    MMIO_GrabNextBuffer(wm, uFlags == MMIO_READ);
 
    if (lpmmioinfo) {
    lpmmioinfo->pchNext = lpmmioinfo->pchBuffer;
    lpmmioinfo->pchEndRead  = lpmmioinfo->pchBuffer +
        (wm->info.pchEndRead - wm->info.pchBuffer);
    lpmmioinfo->pchEndWrite = lpmmioinfo->pchBuffer +
        (wm->info.pchEndWrite - wm->info.pchBuffer);
    lpmmioinfo->lDiskOffset = wm->info.lDiskOffset;
    lpmmioinfo->lBufOffset = wm->info.lBufOffset;
    }
    return MMSYSERR_NOERROR;
}
 
/**************************************************************************
 *              mmioStringToFOURCCA [WINMM.@]
 */
FOURCC WINAPI mmioStringToFOURCCA(LPCSTR sz, UINT uFlags)
{
    CHAR cc[4];
    int i = 0;
 
    for (i = 0; i < 4 && sz[i]; i++) {
    if (uFlags & MMIO_TOUPPER) {
        cc[i] = toupper(sz[i]);
    } else {
        cc[i] = sz[i];
    }
    }
 
    /* Pad with spaces */
    while (i < 4) cc[i++] = ' ';
 
    TRACE("Got '%.4s'\n",cc);
    return mmioFOURCC(cc[0],cc[1],cc[2],cc[3]);
}
 
/**************************************************************************
 *              mmioStringToFOURCCW [WINMM.@]
 */
FOURCC WINAPI mmioStringToFOURCCW(LPCWSTR sz, UINT uFlags)
{
    char    szA[4];
 
    WideCharToMultiByte( CP_ACP, 0, sz, 4, szA, sizeof(szA), NULL, NULL );
    return mmioStringToFOURCCA(szA,uFlags);
}
 
/**************************************************************************
 *              mmioInstallIOProcA     [WINMM.@]
 */
LPMMIOPROC WINAPI mmioInstallIOProcA(FOURCC fccIOProc,
                     LPMMIOPROC pIOProc, DWORD dwFlags)
{
    return MMIO_InstallIOProc(fccIOProc, pIOProc, dwFlags, FALSE);
}
 
/**************************************************************************
 *              mmioInstallIOProcW     [WINMM.@]
 */
LPMMIOPROC WINAPI mmioInstallIOProcW(FOURCC fccIOProc,
                     LPMMIOPROC pIOProc, DWORD dwFlags)
{
    return MMIO_InstallIOProc(fccIOProc, pIOProc, dwFlags, TRUE);
}
 
/******************************************************************
 *      MMIO_SendMessage
 *
 *
 */
static LRESULT  MMIO_SendMessage(HMMIO hmmio, UINT uMessage, LPARAM lParam1,
                                 LPARAM lParam2, BOOL is_unicode)
{
    LPWINE_MMIO     wm;
 
    TRACE("(%p, %u, %ld, %ld, %s)\n", hmmio, uMessage, lParam1, lParam2, is_unicode ? "unicode" : "ansi");
 
    if (uMessage < MMIOM_USER)
    return MMSYSERR_INVALPARAM;
 
    if ((wm = MMIO_Get(hmmio)) == NULL)
    return MMSYSERR_INVALHANDLE;
 
    return send_message(wm->ioProc, &wm->info, uMessage, lParam1, lParam2, is_unicode);
}
 
/**************************************************************************
 *              mmioSendMessage     [WINMM.@]
 */
LRESULT WINAPI mmioSendMessage(HMMIO hmmio, UINT uMessage,
                   LPARAM lParam1, LPARAM lParam2)
{
    return MMIO_SendMessage(hmmio, uMessage, lParam1, lParam2, FALSE);
}
 
/**************************************************************************
 *              mmioDescend             [WINMM.@]
 */
MMRESULT WINAPI mmioDescend(HMMIO hmmio, LPMMCKINFO lpck,
                            const MMCKINFO* lpckParent, UINT uFlags)
{
    DWORD       dwOldPos;
    FOURCC      srchCkId;
    FOURCC      srchType;
 
    TRACE("(%p, %p, %p, %04X);\n", hmmio, lpck, lpckParent, uFlags);
 
    if (lpck == NULL)
    return MMSYSERR_INVALPARAM;
 
    dwOldPos = mmioSeek(hmmio, 0, SEEK_CUR);
    TRACE("dwOldPos=%d\n", dwOldPos);
 
    if (lpckParent != NULL) {
    TRACE("seek inside parent at %d !\n", lpckParent->dwDataOffset);
    /* EPP: was dwOldPos = mmioSeek(hmmio,lpckParent->dwDataOffset,SEEK_SET); */
    if (dwOldPos < lpckParent->dwDataOffset ||
        dwOldPos >= lpckParent->dwDataOffset + lpckParent->cksize) {
        WARN("outside parent chunk\n");
        return MMIOERR_CHUNKNOTFOUND;
    }
    }
 
    /* The SDK docu says 'ckid' is used for all cases. Real World
     * examples disagree -Marcus,990216.
     */
 
    srchCkId = 0;
    srchType = 0;
 
    /* find_chunk looks for 'ckid' */
    if (uFlags & MMIO_FINDCHUNK)
    srchCkId = lpck->ckid;
 
    /* find_riff and find_list look for 'fccType' */
    if (uFlags & MMIO_FINDLIST)
    {
    srchCkId = FOURCC_LIST;
        srchType = lpck->fccType;
    }
 
    if (uFlags & MMIO_FINDRIFF)
    {
    srchCkId = FOURCC_RIFF;
        srchType = lpck->fccType;
    }
 
    TRACE("searching for %4.4s.%4.4s\n",
          (LPCSTR)&srchCkId, srchType ? (LPCSTR)&srchType : "any");
 
    while (TRUE)
    {
        LONG ix;
 
        ix = mmioRead(hmmio, (LPSTR)lpck, 3 * sizeof(DWORD));
        if (ix < 2*sizeof(DWORD))
        {
            mmioSeek(hmmio, dwOldPos, SEEK_SET);
            WARN("return ChunkNotFound\n");
            return MMIOERR_CHUNKNOTFOUND;
        }
 
        lpck->dwDataOffset = dwOldPos + 2 * sizeof(DWORD);
        TRACE("ckid=%4.4s fcc=%4.4s cksize=%08X !\n",
              (LPCSTR)&lpck->ckid,
              srchType ? (LPCSTR)&lpck->fccType:"<na>",
              lpck->cksize);
        if ( (!srchCkId || (srchCkId == lpck->ckid)) &&
             (!srchType || (srchType == lpck->fccType)) )
            break;
 
        dwOldPos = lpck->dwDataOffset + ((lpck->cksize + 1) & ~1);
        mmioSeek(hmmio, dwOldPos, SEEK_SET);
    }
 
    lpck->dwFlags = 0;
    /* If we were looking for RIFF/LIST chunks, the final file position
     * is after the chunkid. If we were just looking for the chunk
     * it is after the cksize. So add 4 in RIFF/LIST case.
     */
    if (lpck->ckid == FOURCC_RIFF || lpck->ckid == FOURCC_LIST)
    mmioSeek(hmmio, lpck->dwDataOffset + sizeof(DWORD), SEEK_SET);
    else
    {
    mmioSeek(hmmio, lpck->dwDataOffset, SEEK_SET);
    lpck->fccType = 0;
    }
    TRACE("lpck: ckid=%.4s, cksize=%d, dwDataOffset=%d fccType=%08X (%.4s)!\n",
      (LPSTR)&lpck->ckid, lpck->cksize, lpck->dwDataOffset,
      lpck->fccType, srchType?(LPSTR)&lpck->fccType:"");
    return MMSYSERR_NOERROR;
}
 
/**************************************************************************
 *              mmioAscend          [WINMM.@]
 */
MMRESULT WINAPI mmioAscend(HMMIO hmmio, LPMMCKINFO lpck, UINT uFlags)
{
    TRACE("(%p, %p, %04X);\n", hmmio, lpck, uFlags);
 
    if (lpck->dwFlags & MMIO_DIRTY) {
    DWORD   dwOldPos, dwNewSize;
 
    TRACE("Chunk is dirty, checking if chunk's size is correct\n");
    dwOldPos = mmioSeek(hmmio, 0, SEEK_CUR);
    TRACE("dwOldPos=%d lpck->dwDataOffset = %d\n", dwOldPos, lpck->dwDataOffset);
    dwNewSize = dwOldPos - lpck->dwDataOffset;
    if (dwNewSize != lpck->cksize) {
        TRACE("Nope: lpck->cksize=%d dwNewSize=%d\n", lpck->cksize, dwNewSize);
        lpck->cksize = dwNewSize;
 
        /* pad odd size with 0 */
        if (dwNewSize & 1) {
        char ch = 0;
        mmioWrite(hmmio, &ch, 1);
        }
        mmioSeek(hmmio, lpck->dwDataOffset - sizeof(DWORD), SEEK_SET);
        mmioWrite(hmmio, (LPSTR)&dwNewSize, sizeof(DWORD));
    }
    lpck->dwFlags = 0;
    }
 
    mmioSeek(hmmio, lpck->dwDataOffset + ((lpck->cksize + 1) & ~1), SEEK_SET);
 
    return MMSYSERR_NOERROR;
}
 
/**************************************************************************
 *          mmioCreateChunk             [WINMM.@]
 */
MMRESULT WINAPI mmioCreateChunk(HMMIO hmmio, MMCKINFO* lpck, UINT uFlags)
{
    DWORD   dwOldPos;
    LONG    size;
    LONG    ix;
 
    TRACE("(%p, %p, %04X);\n", hmmio, lpck, uFlags);
 
    dwOldPos = mmioSeek(hmmio, 0, SEEK_CUR);
    TRACE("dwOldPos=%d\n", dwOldPos);
 
    if (uFlags == MMIO_CREATELIST)
    lpck->ckid = FOURCC_LIST;
    else if (uFlags == MMIO_CREATERIFF)
    lpck->ckid = FOURCC_RIFF;
 
    TRACE("ckid=%.4s\n", (LPSTR)&lpck->ckid);
 
    size = 2 * sizeof(DWORD);
    lpck->dwDataOffset = dwOldPos + size;
 
    if (lpck->ckid == FOURCC_RIFF || lpck->ckid == FOURCC_LIST)
    size += sizeof(DWORD);
    lpck->dwFlags = MMIO_DIRTY;
 
    ix = mmioWrite(hmmio, (LPSTR)lpck, size);
    TRACE("after mmioWrite ix = %d req = %d, errno = %d\n", ix, size, errno);
    if (ix < size) {
    mmioSeek(hmmio, dwOldPos, SEEK_SET);
    WARN("return CannotWrite\n");
    return MMIOERR_CANNOTWRITE;
    }
 
    return MMSYSERR_NOERROR;
}
 
/**************************************************************************
 *              mmioRenameA             [WINMM.@]
 */
MMRESULT WINAPI mmioRenameA(LPCSTR szFileName, LPCSTR szNewFileName,
                            const MMIOINFO* lpmmioinfo, DWORD dwFlags)
{
    struct IOProcList*  ioProc = NULL;
    struct IOProcList   tmp;
    FOURCC              fcc;
 
    TRACE("('%s', '%s', %p, %08X);\n",
      debugstr_a(szFileName), debugstr_a(szNewFileName), lpmmioinfo, dwFlags);
 
    /* If both params are NULL, then parse the file name */
    if (lpmmioinfo && lpmmioinfo->fccIOProc == 0 && lpmmioinfo->pIOProc == NULL)
    {
    fcc = MMIO_ParseExtA(szFileName);
        if (fcc) ioProc = MMIO_FindProcNode(fcc);
    }
 
    /* Handle any unhandled/error case from above. Assume DOS file */
    if (!lpmmioinfo || (lpmmioinfo->fccIOProc == 0 && lpmmioinfo->pIOProc == NULL && ioProc == NULL))
    ioProc = MMIO_FindProcNode(FOURCC_DOS);
    /* if just the four character code is present, look up IO proc */
    else if (lpmmioinfo->pIOProc == NULL)
        ioProc = MMIO_FindProcNode(lpmmioinfo->fccIOProc);
    else /* use relevant ioProc */
    {
        ioProc = &tmp;
        tmp.fourCC = lpmmioinfo->fccIOProc;
        tmp.pIOProc = lpmmioinfo->pIOProc;
        tmp.is_unicode = FALSE;
        tmp.count = 1;
    }
 
    /* FIXME: should we actually pass lpmmioinfo down the drain ???
     * or make a copy of it because it's const ???
     */
    return send_message(ioProc, (MMIOINFO*)lpmmioinfo, MMIOM_RENAME,
                        (LPARAM)szFileName, (LPARAM)szNewFileName, FALSE);
}
 
/**************************************************************************
 *              mmioRenameW             [WINMM.@]
 */
MMRESULT WINAPI mmioRenameW(LPCWSTR szFileName, LPCWSTR szNewFileName,
                            const MMIOINFO* lpmmioinfo, DWORD dwFlags)
{
    LPSTR   szFn = NULL;
    LPSTR   sznFn = NULL;
    UINT    ret = MMSYSERR_NOMEM;
    INT         len;
 
    if (szFileName)
    {
        len = WideCharToMultiByte( CP_ACP, 0, szFileName, -1, NULL, 0, NULL, NULL );
        szFn = HeapAlloc( GetProcessHeap(), 0, len );
        if (!szFn) goto done;
        WideCharToMultiByte( CP_ACP, 0, szFileName, -1, szFn, len, NULL, NULL );
    }
    if (szNewFileName)
    {
        len = WideCharToMultiByte( CP_ACP, 0, szNewFileName, -1, NULL, 0, NULL, NULL );
        sznFn = HeapAlloc( GetProcessHeap(), 0, len );
        if (!sznFn) goto done;
        WideCharToMultiByte( CP_ACP, 0, szNewFileName, -1, sznFn, len, NULL, NULL );
    }
 
    ret = mmioRenameA(szFn, sznFn, lpmmioinfo, dwFlags);
 
done:
    HeapFree(GetProcessHeap(),0,szFn);
    HeapFree(GetProcessHeap(),0,sznFn);
    return ret;
}