Several fixes spotted by Corel (Jean-Claude Batista & Sean Langley).

[wine/multimedia.git] / dlls / winmm / mmio.c

/* -*- tab-width: 8; c-basic-offset: 4 -*- */
/*
 * MMIO functions
 *
 * Copyright 1998 Andrew Taylor
 * Copyright 1998 Ove Kåven
 * Copyright 2000 Eric Pouech
 */

/* Still to be done:
 *      + correct handling of global/local IOProcs
 *      + mode of mmio objects is not used (read vs write vs readwrite)
 *      + IO buffering is limited to 64k
 *      + optimization of internal buffers (seg / lin)
 *      + even in 32 bit only, a seg ptr IO buffer is allocated (after this is 
 *        fixed, we'll have a proper 32/16 separation)
 *      + thread safeness
 *      + rename operation is broken
 */

#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <assert.h>
#include "windef.h"
#include "wine/winbase16.h"
#include "heap.h"
#include "selectors.h"
#include "file.h"
#include "mmsystem.h"
#include "debugtools.h"
#include "winemm.h"

DEFAULT_DEBUG_CHANNEL(mmio);

/**************************************************************************
 *                      mmioDosIOProc                           [internal]
 */
static LRESULT CALLBACK mmioDosIOProc(LPMMIOINFO lpmmioinfo, UINT uMessage, 
                                      LPARAM lParam1, LPARAM lParam2) 
{
    LRESULT     ret = MMSYSERR_NOERROR;

    TRACE("(%p, %X, %ld, %ld);\n", lpmmioinfo, uMessage, lParam1, lParam2);
    
    switch (uMessage) {
    case MMIOM_OPEN: 
        {
            /* Parameters:
             * lParam1 = szFileName parameter from mmioOpen
             * lParam2 = reserved (we use it for 16-bitness)
             * Returns: zero on success, error code on error
             * NOTE: lDiskOffset automatically set to zero
             */
            OFSTRUCT ofs;
            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) {
                if (lParam2) 
                    lpmmioinfo->adwInfo[0] = FILE_GetHandle(lpmmioinfo->adwInfo[0]);
                break;
            }
            
            lpmmioinfo->adwInfo[0] = (DWORD)OpenFile(szFileName, &ofs, 
                                                     lpmmioinfo->dwFlags);
            if (lpmmioinfo->adwInfo[0] == -1)
                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
         */
         FIXME("MMIOM_RENAME incomplete\n");
         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 (we use it for 16-bitness)
         * 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;
        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;
    }
    
    return 0;
}


enum mmioProcType {MMIO_PROC_16,MMIO_PROC_32A,MMIO_PROC_32W};

struct IOProcList
{
    struct IOProcList*pNext;       /* Next item in linked list */
    FOURCC            fourCC;      /* four-character code identifying IOProc */
    LPMMIOPROC        pIOProc;     /* pointer to IProc */
    enum mmioProcType type;        /* 16, 32A or 32W */
    int               count;       /* number of objects linked to it */
};

/* This array will be the entire list for most apps */

static struct IOProcList defaultProcs[] = {
    {&defaultProcs[1], FOURCC_DOS, (LPMMIOPROC)mmioDosIOProc, MMIO_PROC_32A, 0},
    {NULL,             FOURCC_MEM, (LPMMIOPROC)mmioMemIOProc, MMIO_PROC_32A, 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, enum mmioProcType type)
{
    LPMMIOPROC          lpProc = NULL;
    struct IOProcList*  pListNode;
    struct IOProcList** ppListNode;

    TRACE("(%ld, %p, %08lX, %i)\n", fccIOProc, pIOProc, dwFlags, type);

    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->type = type;
            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 - 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) && (*ppListNode)->fourCC != fccIOProc)
            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)) {
                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;
}

/****************************************************************
 *                      MMIO_Map32To16                  [INTERNAL]
 */
static LRESULT  MMIO_Map32To16(DWORD wMsg, LPARAM* lp1, LPARAM* lp2)
{
    switch (wMsg) {
    case MMIOM_OPEN:
        {
            void*       lp = SEGPTR_ALLOC(strlen((LPSTR)*lp1) + 1);
            if (!lp) return MMSYSERR_NOMEM;
           
            strcpy((void*)SEGPTR_GET(lp), (LPSTR)*lp1);
            *lp1 = (LPARAM)lp;
        }
        break;
    case MMIOM_CLOSE:
    case MMIOM_SEEK:
        /* nothing to do */
        break;
    case MMIOM_READ:
    case MMIOM_WRITE:
    case MMIOM_WRITEFLUSH:
        {
            void*       lp = SEGPTR_ALLOC(*lp2);
            if (!lp) return MMSYSERR_NOMEM;
           
            if (wMsg != MMIOM_READ)
                memcpy((void*)SEGPTR_GET(lp), (void*)*lp1, *lp2);
            *lp1 = (LPARAM)lp;
        }
        break;
    default:
        TRACE("Not a mappable message (%ld)\n", wMsg);
    }
    return MMSYSERR_NOERROR;
}

/****************************************************************
 *              MMIO_UnMap32To16                        [INTERNAL]
 */
static LRESULT  MMIO_UnMap32To16(DWORD wMsg, LPARAM lParam1, LPARAM lParam2,
                                 LPARAM lp1, LPARAM lp2)
{
    switch (wMsg) {
    case MMIOM_OPEN:
        if (!SEGPTR_FREE((void*)lp1)) {
            FIXME("bad free line=%d\n", __LINE__);
        } 
        break;
    case MMIOM_CLOSE:
    case MMIOM_SEEK:
        /* nothing to do */
        break;
    case MMIOM_READ:
        memcpy((void*)lParam1, (void*)SEGPTR_GET((void*)lp1), lp2);
        /* fall thru */
    case MMIOM_WRITE:
    case MMIOM_WRITEFLUSH:
        if (!SEGPTR_FREE((void*)lp1)) {
            FIXME("bad free line=%d\n", __LINE__);
        } 
        break;
    default:
        TRACE("Not a mappable message (%ld)\n", wMsg);
    }
    return MMSYSERR_NOERROR;
}

/****************************************************************
 *              MMIO_GenerateInfoForIOProc              [INTERNAL]
 */
static  SEGPTR  MMIO_GenerateInfoForIOProc(const WINE_MMIO* wm)
{
    SEGPTR              lp = (SEGPTR)SEGPTR_ALLOC(sizeof(MMIOINFO16));
    LPMMIOINFO16        mmioInfo16 = (LPMMIOINFO16)SEGPTR_GET((void*)lp);

    memset(mmioInfo16, 0, sizeof(MMIOINFO16));

    mmioInfo16->lDiskOffset = wm->info.lDiskOffset;    
    mmioInfo16->adwInfo[0]  = wm->info.adwInfo[0];
    mmioInfo16->adwInfo[1]  = wm->info.adwInfo[1];
    mmioInfo16->adwInfo[2]  = wm->info.adwInfo[2];
    mmioInfo16->adwInfo[3]  = wm->info.adwInfo[3];

    return lp;
}

/****************************************************************
 *              MMIO_UpdateInfoForIOProc                [INTERNAL]
 */
static  LRESULT MMIO_UpdateInfoForIOProc(WINE_MMIO* wm, SEGPTR segmmioInfo16)
{
    const MMIOINFO16*   mmioInfo16;

    mmioInfo16 = (const MMIOINFO16*)SEGPTR_GET((void*)segmmioInfo16);

    wm->info.lDiskOffset = mmioInfo16->lDiskOffset;
    wm->info.adwInfo[0]  = mmioInfo16->adwInfo[0];
    wm->info.adwInfo[1]  = mmioInfo16->adwInfo[1];
    wm->info.adwInfo[2]  = mmioInfo16->adwInfo[2];
    wm->info.adwInfo[3]  = mmioInfo16->adwInfo[3];

    if (!SEGPTR_FREE((void*)segmmioInfo16)) {
        FIXME("bad free line=%d\n", __LINE__);
    } 

    return MMSYSERR_NOERROR;
}

/****************************************************************
 *              MMIO_SendMessage                        [INTERNAL]
 */
static LRESULT  MMIO_SendMessage(LPWINE_MMIO wm, DWORD wMsg, LPARAM lParam1, 
                                 LPARAM lParam2, enum mmioProcType type)
{
    LRESULT             result;
    SEGPTR              segmmioInfo16;
    LPARAM              lp1 = lParam1, lp2 = lParam2;

    if (!wm->ioProc || !wm->info.pIOProc) {
        ERR("brrr\n");
        result = MMSYSERR_INVALPARAM;
    }

    switch (wm->ioProc->type) {
    case MMIO_PROC_16:
        segmmioInfo16 = MMIO_GenerateInfoForIOProc(wm);
        if (wm->ioProc->type != type) {
            /* map (lParam1, lParam2) into (lp1, lp2) 32=>16 */
            if ((result = MMIO_Map32To16(wMsg, &lp1, &lp2)) != MMSYSERR_NOERROR)
                return result;
        }
        /* FIXME: is wm->info.pIOProc a segmented or a linear address ?
         * sounds to me it's a segmented one, should use a thunk somewhere
         */
        result = ((LPMMIOPROC16)wm->info.pIOProc)((LPSTR)segmmioInfo16, 
                                                  wMsg, lp1, lp2);
        
        if (wm->ioProc->type != type) {
            MMIO_UnMap32To16(wMsg, lParam1, lParam2, lp1, lp2);
        }
        MMIO_UpdateInfoForIOProc(wm, segmmioInfo16);
        break;
    case MMIO_PROC_32A:
    case MMIO_PROC_32W:
        if (wm->ioProc->type != type) {
            /* map (lParam1, lParam2) into (lp1, lp2) 16=>32 */
            WARN("NIY\n");
        }
        result = (wm->info.pIOProc)((LPSTR)&wm->info, wMsg, lp1, lp2);
        
#if 0
        if (wm->ioProc->type != type) {
            /* unmap (lParam1, lParam2) into (lp1, lp2) 16=>32 */
        }
#endif
        break;
    default:  
        FIXME("Internal error\n");
        result = MMSYSERR_ERROR;
    }

    return result;
}

/**************************************************************************
 *                              MMIO_ParseExt                   [internal]
 *
 * Parses a filename for the extension.
 *
 * RETURNS
 *  The FOURCC code for the extension if found, else 0.
 */
static FOURCC MMIO_ParseExt(LPCSTR szFileName)
{
    /* Filenames are of the form file.ext+ABC
       FIXME: What if a '+' is part of the file name?
       For now, we take the last '+' present */
    
    FOURCC ret = 0;
    
    /* Note that ext{Start,End} point to the . and + respectively */
    LPSTR extEnd;
    
    TRACE("(%s)\n",debugstr_a(szFileName));
    
    extEnd = strrchr(szFileName,'+');
    if (extEnd) {
        /* Need to parse to find the extension */
        LPSTR extStart;
        
        extStart = extEnd;
        while (extStart > szFileName && extStart[0] != '.') {
            extStart--;
        }
        
        if (extStart == szFileName) {
            ERR("+ but no . in szFileName: %s\n", debugstr_a(szFileName));
        } else {
            CHAR ext[5];
            
            if (extEnd - extStart - 1 > 4)
                WARN("Extension length > 4\n");
            lstrcpynA(ext,extStart + 1,min(extEnd-extStart,5));
            TRACE("Got extension: %s\n", debugstr_a(ext));
            /* FOURCC codes identifying file-extentions must be uppercase */
            ret = mmioStringToFOURCCA(ext, MMIO_TOUPPER);
        }
    }
    return ret;
}

/**************************************************************************
 *                              MMIO_Get                        [internal]
 *
 * Retirieves from current process the mmio object
 */
static  LPWINE_MMIO     MMIO_Get(LPWINE_MM_IDATA iData, HMMIO h)
{
    LPWINE_MMIO         wm = NULL;

    if (!iData) iData = MULTIMEDIA_GetIData();

    EnterCriticalSection(&iData->cs);
    for (wm = iData->lpMMIO; wm; wm = wm->lpNext) {
        if (wm->info.hmmio == h)
            break;
    }
    LeaveCriticalSection(&iData->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;
    LPWINE_MM_IDATA     iData = MULTIMEDIA_GetIData();

    wm = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(WINE_MMIO));
    if (wm) {
        EnterCriticalSection(&iData->cs);
        while (MMIO_Get(iData, ++MMIO_counter));
        wm->info.hmmio = MMIO_counter;
        wm->lpNext = iData->lpMMIO;
        iData->lpMMIO = wm;
        LeaveCriticalSection(&iData->cs);
    }
    return wm;
}

/**************************************************************************
 *                              MMIO_Destroy                    [internal]
 *-
 * Destroys an internal representation for a mmio instance
 */
static  BOOL            MMIO_Destroy(LPWINE_MMIO wm)
{
    LPWINE_MM_IDATA     iData = MULTIMEDIA_GetIData();
    LPWINE_MMIO*        m;

    EnterCriticalSection(&iData->cs);
    for (m = &(iData->lpMMIO); *m && *m != wm; m = &(*m)->lpNext);
    if (*m) {
        *m = (*m)->lpNext;
        HeapFree(GetProcessHeap(), 0, wm);
        wm = NULL;
    }
    LeaveCriticalSection(&iData->cs);
    return wm ? FALSE : TRUE;
}

/****************************************************************
 *                      MMIO_Flush                      [INTERNAL]
 */
static  LRESULT MMIO_Flush(WINE_MMIO* wm, UINT uFlags)
{
    if ((!wm->info.cchBuffer) || (wm->info.fccIOProc == FOURCC_MEM)) {
        return 0;
    }

    /* not quite sure what to do here, but I'll guess */
    if (wm->info.dwFlags & MMIO_DIRTY) {
        MMIO_SendMessage(wm, MMIOM_SEEK, wm->info.lDiskOffset,
                         SEEK_SET, MMIO_PROC_32A);
        MMIO_SendMessage(wm, MMIOM_WRITE, (LPARAM)wm->info.pchBuffer,
                         wm->info.pchNext - wm->info.pchBuffer, MMIO_PROC_32A);
        wm->info.dwFlags &= ~MMIO_DIRTY;
    }
    if (uFlags & MMIO_EMPTYBUF)
        wm->info.pchNext = wm->info.pchBuffer;

    return 0;
}

/***************************************************************************
 *                      MMIO_GrabNextBuffer                     [INTERNAL]
 */
static LONG     MMIO_GrabNextBuffer(LPWINE_MMIO wm, int for_read)
{
    LONG        size = wm->info.cchBuffer;

    TRACE("bo=%lx do=%lx of=%lx\n", 
          wm->info.lBufOffset, wm->info.lDiskOffset, 
          MMIO_SendMessage(wm, MMIOM_SEEK, 0, SEEK_CUR, MMIO_PROC_32A));
          
    wm->info.lBufOffset = wm->info.lDiskOffset;
    wm->info.pchNext = wm->info.pchBuffer;
    wm->info.pchEndRead = wm->info.pchBuffer;
    wm->info.pchEndWrite = wm->info.pchBuffer;

    if (for_read) {
        size = MMIO_SendMessage(wm, MMIOM_READ, (LPARAM)wm->info.pchBuffer,
                                size, MMIO_PROC_32A);
        if (size > 0)
            wm->info.pchEndRead += size;
    }
    wm->bBufferLoaded = TRUE;
    return size;
}

/***************************************************************************
 *                      MMIO_SetBuffer                          [INTERNAL]
 */
static  UINT    MMIO_SetBuffer(WINE_MMIO* wm, void* pchBuffer, LONG cchBuffer, 
                               UINT uFlags, BOOL bFrom32)
{
    TRACE("(%p %p %ld %u %d)\n", wm, pchBuffer, cchBuffer, uFlags, bFrom32);

    if (uFlags)                 return MMSYSERR_INVALPARAM;
    if (cchBuffer > 0xFFFF) {
        FIXME("Not handling huge mmio buffers yet (%ld >= 64k)\n", cchBuffer);
        return MMSYSERR_INVALPARAM;
    }
        
    if (MMIO_Flush(wm, MMIO_EMPTYBUF) != 0)
        return MMIOERR_CANNOTWRITE;
    
    if ((!cchBuffer || pchBuffer) && (wm->info.dwFlags & MMIO_ALLOCBUF)) {
        GlobalUnlock16(wm->hMem);
        GlobalFree16(wm->hMem);
        wm->info.dwFlags &= ~MMIO_ALLOCBUF;
    }
    if (pchBuffer) {
        if (bFrom32) {
            wm->info.pchBuffer = pchBuffer;
            wm->buffer16 = 0;
        } else {
            wm->info.pchBuffer = PTR_SEG_TO_LIN(pchBuffer);
            wm->buffer16 = (SEGPTR)pchBuffer;
        }
        wm->hMem = 0;
    } else if (cchBuffer && (wm->info.dwFlags & MMIO_ALLOCBUF)) {
        HGLOBAL16 hNewBuf;
        GlobalUnlock16(wm->hMem);
        hNewBuf = GlobalReAlloc16(wm->hMem, cchBuffer, 0);
        if (!hNewBuf) {
            /* FIXME: this assumes the memory block didn't move */
            GlobalLock16(wm->hMem);
            return MMIOERR_OUTOFMEMORY;
        }
        wm->hMem = hNewBuf;
    } else if (cchBuffer) {
        if (!(wm->hMem = GlobalAlloc16(GMEM_MOVEABLE, cchBuffer)))
            return MMIOERR_OUTOFMEMORY;
        wm->info.dwFlags |= MMIO_ALLOCBUF;
    } else {
        wm->info.pchBuffer = NULL;
        wm->hMem = 0;
        wm->buffer16 = 0;
    }

    if (wm->hMem) {
        wm->buffer16 = WIN16_GlobalLock16(wm->hMem);
        wm->info.pchBuffer = (void*)PTR_SEG_TO_LIN((void*)wm->buffer16);
    }

    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 = 0;
    wm->bBufferLoaded = FALSE;

    return 0;
}

/**************************************************************************
 *                      MMIO_Open                               [internal]
 */
static HMMIO MMIO_Open(LPSTR szFileName, MMIOINFO* refmminfo, 
                       DWORD dwOpenFlags, enum mmioProcType type)
{
    LPWINE_MMIO         wm;

    TRACE("('%s', %p, %08lX, %d);\n", szFileName, refmminfo, dwOpenFlags, type);
    
    if (dwOpenFlags & (MMIO_PARSE|MMIO_EXIST)) {
        char    buffer[MAX_PATH];
        
        if (GetFullPathNameA(szFileName, sizeof(buffer), buffer, NULL) >= sizeof(buffer))
            return (HMMIO16)FALSE;
        if ((dwOpenFlags & MMIO_EXIST) && (GetFileAttributesA(buffer) == -1))
            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 (refmminfo->fccIOProc == 0 && refmminfo->pIOProc == NULL) {
        wm->info.fccIOProc = MMIO_ParseExt(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))) goto error2;
        wm->info.pIOProc = wm->ioProc->pIOProc;
        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->info.pIOProc = wm->ioProc->pIOProc;
        wm->bTmpIOProc = FALSE;
    } 
    /* if IO proc specified, use it and specified four character code */
    else {
        wm->info.fccIOProc = refmminfo->fccIOProc;
        wm->info.pIOProc = refmminfo->pIOProc;
        MMIO_InstallIOProc(wm->info.fccIOProc, wm->info.pIOProc, 
                           MMIO_INSTALLPROC, type);
        if (!(wm->ioProc = MMIO_FindProcNode(wm->info.fccIOProc))) goto error2;
        assert(wm->ioProc->pIOProc == refmminfo->pIOProc);
        wm->info.pIOProc = wm->ioProc->pIOProc;
        wm->bTmpIOProc = TRUE;
    }
    
    wm->bBufferLoaded = FALSE;
    wm->ioProc->count++;

    if (dwOpenFlags & MMIO_ALLOCBUF) {
        if ((refmminfo->wErrorRet = mmioSetBuffer(wm->info.hmmio, NULL, 
                                                  MMIO_DEFAULTBUFFER, 0)))
            goto error1;
    } else if (wm->info.fccIOProc == FOURCC_MEM) {
        refmminfo->wErrorRet = MMIO_SetBuffer(wm, refmminfo->pchBuffer, 
                                              refmminfo->cchBuffer, 0, 
                                              type != MMIO_PROC_16);
        if (refmminfo->wErrorRet != MMSYSERR_NOERROR)
            goto error1;
    } /* else => unbuffered, wm->info.pchBuffer == NULL */
    
    /* see mmioDosIOProc for that one */
    wm->info.adwInfo[0] = refmminfo->adwInfo[0];
    wm->info.dwFlags = dwOpenFlags;
    
    /* call IO proc to actually open file */
    refmminfo->wErrorRet = MMIO_SendMessage(wm, MMIOM_OPEN, (LPARAM)szFileName, 
                                            type == MMIO_PROC_16, MMIO_PROC_32A);

    if (refmminfo->wErrorRet == 0)
        return wm->info.hmmio;
 error1:
    if (wm->ioProc) wm->ioProc->count--;
 error2:
    MMIO_Destroy(wm);
    return 0;
}

/**************************************************************************
 *                              mmioOpenW                       [WINMM.123]
 */
HMMIO WINAPI mmioOpenW(LPWSTR szFileName, MMIOINFO* lpmmioinfo,
                       DWORD dwOpenFlags)
{
    HMMIO       ret;
    LPSTR       szFn = HEAP_strdupWtoA(GetProcessHeap(), 0, szFileName);

    if (lpmmioinfo) {
        ret = MMIO_Open(szFn, lpmmioinfo, dwOpenFlags, MMIO_PROC_32W);
    } else {
        MMIOINFO        mmioinfo;
        
        mmioinfo.fccIOProc = 0;
        mmioinfo.pIOProc = NULL;
        mmioinfo.pchBuffer = NULL;
        mmioinfo.cchBuffer = 0;
        
        ret = MMIO_Open(szFn, &mmioinfo, dwOpenFlags, MMIO_PROC_32W);
    }

    HeapFree(GetProcessHeap(), 0, szFn);
    return ret;
}

/**************************************************************************
 *                              mmioOpenA                       [WINMM.122]
 */
HMMIO WINAPI mmioOpenA(LPSTR szFileName, MMIOINFO* lpmmioinfo, 
                       DWORD dwOpenFlags)
{
    HMMIO       ret;
    
    if (lpmmioinfo) {
        ret = MMIO_Open(szFileName, lpmmioinfo, dwOpenFlags, MMIO_PROC_32A);
    } else {
        MMIOINFO        mmioinfo;
        
        mmioinfo.fccIOProc = 0;
        mmioinfo.pIOProc = NULL;
        mmioinfo.pchBuffer = NULL;
        mmioinfo.cchBuffer = 0;
        
        ret = MMIO_Open(szFileName, &mmioinfo, dwOpenFlags, MMIO_PROC_32A);
    }
    return ret;
}

/**************************************************************************
 *                              mmioOpen                [MMSYSTEM.1210]
 */
HMMIO16 WINAPI mmioOpen16(LPSTR szFileName, MMIOINFO16* lpmmioinfo16, 
                          DWORD dwOpenFlags)
{
    HMMIO       ret;
    MMIOINFO    mmio;
    
    if (lpmmioinfo16) {
        MMIOINFO        mmioinfo;
       
        memset(&mmioinfo, 0, sizeof(mmioinfo));

        mmioinfo.dwFlags     = lpmmioinfo16->dwFlags; 
        mmioinfo.fccIOProc   = lpmmioinfo16->fccIOProc; 
        mmioinfo.pIOProc     = (LPMMIOPROC)lpmmioinfo16->pIOProc; 
        mmioinfo.cchBuffer   = lpmmioinfo16->cchBuffer; 
        mmioinfo.pchBuffer   = lpmmioinfo16->pchBuffer;
        mmioinfo.adwInfo[0]  = lpmmioinfo16->adwInfo[0]; 
        mmioinfo.adwInfo[1]  = lpmmioinfo16->adwInfo[1]; 
        mmioinfo.adwInfo[2]  = lpmmioinfo16->adwInfo[2]; 
        mmioinfo.adwInfo[3]  = lpmmioinfo16->adwInfo[3]; 
        
        ret = MMIO_Open(szFileName, &mmioinfo, dwOpenFlags, MMIO_PROC_16);

        mmioGetInfo16(mmioinfo.hmmio, lpmmioinfo16, 0);
        lpmmioinfo16->wErrorRet = ret;
    } else {
        mmio.fccIOProc = 0;
        mmio.pIOProc = NULL;
        mmio.pchBuffer = NULL;
        mmio.cchBuffer = 0;
        ret = MMIO_Open(szFileName, &mmio, dwOpenFlags, FALSE);
    }
    return ret;
}

    
/**************************************************************************
 *                              mmioClose               [WINMM.114]
 */
MMRESULT WINAPI mmioClose(HMMIO hmmio, UINT uFlags)
{
    LPWINE_MMIO wm;
    MMRESULT    result;
    
    TRACE("(%04X, %04X);\n", hmmio, uFlags);
    
    if ((wm = MMIO_Get(NULL, hmmio)) == NULL)
        return MMSYSERR_INVALHANDLE;
    
    if ((result = MMIO_Flush(wm, MMIO_EMPTYBUF)) != 0)
        return result;
    
    result = MMIO_SendMessage(wm, MMIOM_CLOSE, uFlags, 0, MMIO_PROC_32A);
    
    mmioSetBuffer(hmmio, NULL, 0, 0);
    
    wm->ioProc->count--;

    if (wm->bTmpIOProc)
        MMIO_InstallIOProc(wm->info.fccIOProc, NULL, 
                           MMIO_REMOVEPROC, wm->ioProc->type);

    MMIO_Destroy(wm);

    return result;
}

/**************************************************************************
 *                              mmioClose               [MMSYSTEM.1211]
 */
MMRESULT16 WINAPI mmioClose16(HMMIO16 hmmio, UINT16 uFlags)
{
    return mmioClose(hmmio, uFlags);
}

/**************************************************************************
 *                              mmioRead                [WINMM.124]
 */
LONG WINAPI mmioRead(HMMIO hmmio, HPSTR pch, LONG cch)
{
    LPWINE_MMIO wm;
    LONG        count;
    
    TRACE("(%04X, %p, %ld);\n", hmmio, pch, cch);
    
    if ((wm = MMIO_Get(NULL, hmmio)) == NULL)
        return -1;

    /* unbuffered case first */
    if (!wm->info.pchBuffer)
        return MMIO_SendMessage(wm, MMIOM_READ, (LPARAM)pch, cch, MMIO_PROC_32A);

    /* 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=%ld\n", count);
    return count;
}

/**************************************************************************
 *                              mmioRead                [MMSYSTEM.1212]
 */
LONG WINAPI mmioRead16(HMMIO16 hmmio, HPSTR pch, LONG cch)
{
    return mmioRead(hmmio, pch, cch);
}

/**************************************************************************
 *                              mmioWrite               [WINMM.133]
 */
LONG WINAPI mmioWrite(HMMIO hmmio, HPCSTR pch, LONG cch)
{
    LPWINE_MMIO wm;
    LONG count,bytesW=0;

    TRACE("(%04X, %p, %ld);\n", hmmio, pch, cch);

    if ((wm = MMIO_Get(NULL, hmmio)) == NULL)
        return -1;
    
    if (wm->info.cchBuffer) {
        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);
            else break;
        }
    } else {
        bytesW = MMIO_SendMessage(wm, MMIOM_WRITE, (LPARAM)pch, cch, MMIO_PROC_32A);
        wm->info.lBufOffset = wm->info.lDiskOffset;
    }
    
    TRACE("bytes written=%ld\n", bytesW);
    return bytesW;
}

/**************************************************************************
 *                              mmioWrite               [MMSYSTEM.1213]
 */
LONG WINAPI mmioWrite16(HMMIO16 hmmio, HPCSTR pch, LONG cch)
{
    return mmioWrite(hmmio,pch,cch);
}

/**************************************************************************
 *                              mmioSeek                [MMSYSTEM.1214]
 */
LONG WINAPI mmioSeek(HMMIO hmmio, LONG lOffset, INT iOrigin)
{
    LPWINE_MMIO wm;
    LONG        offset;

    TRACE("(%04X, %08lX, %d);\n", hmmio, lOffset, iOrigin);
    
    if ((wm = MMIO_Get(NULL, hmmio)) == NULL)
        return MMSYSERR_INVALHANDLE;

    /* not buffered, direct seek on file */
    if (!wm->info.pchBuffer)
        return MMIO_SendMessage(wm, MMIOM_SEEK, lOffset, iOrigin, MMIO_PROC_32A);

    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: 
        if (wm->info.fccIOProc == FOURCC_MEM) {
            offset = wm->info.cchBuffer;
        } else {
            assert(MMIO_SendMessage(wm, MMIOM_SEEK, 0, SEEK_CUR, MMIO_PROC_32A) == wm->info.lDiskOffset);
            offset = MMIO_SendMessage(wm, MMIOM_SEEK, 0, SEEK_END, MMIO_PROC_32A);
            MMIO_SendMessage(wm, MMIOM_SEEK, wm->info.lDiskOffset, SEEK_SET, MMIO_PROC_32A);
        }
        offset -= lOffset;
        break;
    default:
        return -1;
    }

    /* stay in same buffer ? */
    /* some memory mapped buffers are defined with -1 as a size */
    if ((wm->info.cchBuffer > 0) &&
        ((offset < wm->info.lBufOffset) ||
         (offset >= wm->info.lBufOffset + wm->info.cchBuffer) ||
         !wm->bBufferLoaded)) {

        /* condition to change buffer */
        if ((wm->info.fccIOProc == FOURCC_MEM) || 
            MMIO_Flush(wm, MMIO_EMPTYBUF) ||
            /* this also sets the wm->info.lDiskOffset field */
            MMIO_SendMessage(wm, MMIOM_SEEK, 
                             (offset / wm->info.cchBuffer) * wm->info.cchBuffer,
                             SEEK_SET, MMIO_PROC_32A) == -1)
            return -1;
        MMIO_GrabNextBuffer(wm, TRUE);
    }

    wm->info.pchNext = wm->info.pchBuffer + (offset - wm->info.lBufOffset);

    TRACE("=> %ld\n", offset);
    return offset;
}

/**************************************************************************
 *                              mmioSeek                [MMSYSTEM.1214]
 */
LONG WINAPI mmioSeek16(HMMIO16 hmmio, LONG lOffset, INT16 iOrigin)
{
    return mmioSeek(hmmio, lOffset, iOrigin);
}

/**************************************************************************
 *                              mmioGetInfo             [MMSYSTEM.1215]
 */
UINT16 WINAPI mmioGetInfo16(HMMIO16 hmmio, MMIOINFO16* lpmmioinfo, UINT16 uFlags)
{
    LPWINE_MMIO wm;

    TRACE("mmioGetInfo\n");

    if ((wm = MMIO_Get(NULL, hmmio)) == NULL)
        return MMSYSERR_INVALHANDLE;

    if (!wm->buffer16)
        return MMSYSERR_ERROR;

    lpmmioinfo->dwFlags     = wm->info.dwFlags; 
    lpmmioinfo->fccIOProc   = wm->info.fccIOProc; 
    lpmmioinfo->pIOProc     = (LPMMIOPROC16)wm->info.pIOProc; 
    lpmmioinfo->wErrorRet   = wm->info.wErrorRet; 
    lpmmioinfo->hTask       = wm->info.hTask; 
    lpmmioinfo->cchBuffer   = wm->info.cchBuffer; 
    lpmmioinfo->pchBuffer   = (void*)wm->buffer16;
    lpmmioinfo->pchNext     = (void*)(wm->buffer16 + (wm->info.pchNext - wm->info.pchBuffer));
    lpmmioinfo->pchEndRead  = (void*)(wm->buffer16 + (wm->info.pchEndRead - wm->info.pchBuffer));
    lpmmioinfo->pchEndWrite = (void*)(wm->buffer16 + (wm->info.pchEndWrite - wm->info.pchBuffer)); 
    lpmmioinfo->lBufOffset  = wm->info.lBufOffset; 
    lpmmioinfo->lDiskOffset = wm->info.lDiskOffset; 
    lpmmioinfo->adwInfo[0]  = wm->info.adwInfo[0]; 
    lpmmioinfo->adwInfo[1]  = wm->info.adwInfo[1]; 
    lpmmioinfo->adwInfo[2]  = wm->info.adwInfo[2]; 
    lpmmioinfo->adwInfo[3]  = wm->info.adwInfo[3]; 
    lpmmioinfo->dwReserved1 = 0;
    lpmmioinfo->dwReserved2 = 0;
    lpmmioinfo->hmmio = wm->info.hmmio; 

    return 0;
}

/**************************************************************************
 *                              mmioGetInfo             [WINMM.118]
 */
UINT WINAPI mmioGetInfo(HMMIO hmmio, MMIOINFO* lpmmioinfo, UINT uFlags)
{
    LPWINE_MMIO         wm;
    
    TRACE("(0x%04x,%p,0x%08x)\n",hmmio,lpmmioinfo,uFlags);

    if ((wm = MMIO_Get(NULL, hmmio)) == NULL)
        return MMSYSERR_INVALHANDLE;

    memcpy(lpmmioinfo, &wm->info, sizeof(MMIOINFO));

    return 0;
}

/**************************************************************************
 *                              mmioSetInfo16           [MMSYSTEM.1216]
 */
UINT16 WINAPI mmioSetInfo16(HMMIO16 hmmio, const MMIOINFO16* lpmmioinfo, UINT16 uFlags)
{
    LPWINE_MMIO         wm;

    TRACE("mmioSetInfo\n");

    if ((wm = MMIO_Get(NULL, hmmio)) == NULL)
        return MMSYSERR_INVALHANDLE;

    /* check if seg and lin buffers are the same */
    if (wm->info.cchBuffer != lpmmioinfo->cchBuffer ||
        wm->info.pchBuffer != PTR_SEG_TO_LIN((void*)wm->buffer16))
        return MMSYSERR_INVALPARAM;
        
    /* check pointers coherence */
    if (lpmmioinfo->pchNext < lpmmioinfo->pchBuffer || 
        lpmmioinfo->pchNext > lpmmioinfo->pchBuffer + lpmmioinfo->cchBuffer ||
        lpmmioinfo->pchEndRead < lpmmioinfo->pchBuffer || 
        lpmmioinfo->pchEndRead > lpmmioinfo->pchBuffer + lpmmioinfo->cchBuffer ||
        lpmmioinfo->pchEndWrite < lpmmioinfo->pchBuffer || 
        lpmmioinfo->pchEndWrite > lpmmioinfo->pchBuffer + lpmmioinfo->cchBuffer)
        return MMSYSERR_INVALPARAM;

    wm->info.pchNext     = wm->info.pchBuffer + (lpmmioinfo->pchNext     - lpmmioinfo->pchBuffer);
    wm->info.pchEndRead  = wm->info.pchBuffer + (lpmmioinfo->pchEndRead  - lpmmioinfo->pchBuffer);
    wm->info.pchEndWrite = wm->info.pchBuffer + (lpmmioinfo->pchEndWrite - lpmmioinfo->pchBuffer);

    return 0;
}

/**************************************************************************
 *                              mmioSetInfo             [WINMM.130]
 */
UINT WINAPI mmioSetInfo(HMMIO hmmio, const MMIOINFO* lpmmioinfo, UINT uFlags)
{
    LPWINE_MMIO         wm;

    TRACE("mmioSetInfo\n");

    if ((wm = MMIO_Get(NULL, 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 0;
}

/**************************************************************************
*                               mmioSetBuffer           [WINMM.129]
*/
UINT WINAPI mmioSetBuffer(HMMIO hmmio, LPSTR pchBuffer, LONG cchBuffer, UINT uFlags)
{
    LPWINE_MMIO         wm;

    TRACE("(hmmio=%04x, pchBuf=%p, cchBuf=%ld, uFlags=%#08x)\n",
          hmmio, pchBuffer, cchBuffer, uFlags);
    
    if ((wm = MMIO_Get(NULL, hmmio)) == NULL)
        return MMSYSERR_INVALHANDLE;

    return MMIO_SetBuffer(wm, pchBuffer, cchBuffer, uFlags, TRUE);
}

/**************************************************************************
 *                              mmioSetBuffer           [MMSYSTEM.1217]
 */
UINT16 WINAPI mmioSetBuffer16(HMMIO16 hmmio, LPSTR segpchBuffer, 
                              LONG cchBuffer, UINT16 uFlags)
{
    LPWINE_MMIO         wm;

    TRACE("(hmmio=%04x, segpchBuf=%p, cchBuf=%ld, uFlags=%#08x)\n",
          hmmio, segpchBuffer, cchBuffer, uFlags);
    
    if ((wm = MMIO_Get(NULL, hmmio)) == NULL)
        return MMSYSERR_INVALHANDLE;

    return MMIO_SetBuffer(wm, segpchBuffer, cchBuffer, uFlags, FALSE);
}

/**************************************************************************
 *                              mmioFlush               [WINMM.117]
 */
UINT WINAPI mmioFlush(HMMIO hmmio, UINT uFlags)
{
    LPWINE_MMIO         wm;

    TRACE("(%04X, %04X)\n", hmmio, uFlags);

    if ((wm = MMIO_Get(NULL, hmmio)) == NULL)
        return MMSYSERR_INVALHANDLE;
       
    return MMIO_Flush(wm, uFlags);
}

/**************************************************************************
 *                              mmioFlush               [MMSYSTEM.1218]
 */
UINT16 WINAPI mmioFlush16(HMMIO16 hmmio, UINT16 uFlags)
{
    return mmioFlush(hmmio, uFlags);
}

/**************************************************************************
 *                              mmioAdvance             [MMSYSTEM.1219]
 */
UINT WINAPI mmioAdvance(HMMIO hmmio, MMIOINFO* lpmmioinfo, UINT uFlags)
{
    LPWINE_MMIO         wm;
    
    TRACE("hmmio=%04X, lpmmioinfo=%p, uFlags=%04X\n", hmmio, lpmmioinfo, uFlags);

    if ((wm = MMIO_Get(NULL, hmmio)) == NULL)
        return MMSYSERR_INVALHANDLE;

    if (!wm->info.cchBuffer)
        return MMIOERR_UNBUFFERED;

    if (uFlags != MMIO_READ && uFlags != MMIO_WRITE)
        return MMSYSERR_INVALPARAM;

    if (MMIO_Flush(wm, MMIO_EMPTYBUF))
        return MMIOERR_CANNOTWRITE;

    MMIO_GrabNextBuffer(wm, uFlags == MMIO_READ);

    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 0;
}

/***********************************************************************
 *                              mmioAdvance             [MMSYSTEM.1219]
 */
UINT16 WINAPI mmioAdvance16(HMMIO16 hmmio, MMIOINFO16* lpmmioinfo, UINT16 uFlags)
{
    LPWINE_MMIO         wm;

    TRACE("mmioAdvance\n");

    if ((wm = MMIO_Get(NULL, hmmio)) == NULL)
        return MMSYSERR_INVALHANDLE;

    if (!wm->info.cchBuffer)
        return MMIOERR_UNBUFFERED;

    if (uFlags != MMIO_READ && uFlags != MMIO_WRITE)
        return MMSYSERR_INVALPARAM;

    if (MMIO_Flush(wm, MMIO_EMPTYBUF))
        return MMIOERR_CANNOTWRITE;

    MMIO_GrabNextBuffer(wm, uFlags == MMIO_READ);
        
    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 0;
}

/**************************************************************************
 *                              mmioStringToFOURCCA     [WINMM.131]
 */
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] = ' ';
        i++;
    }
    
    TRACE("Got %c%c%c%c\n",cc[0],cc[1],cc[2],cc[3]);
    return mmioFOURCC(cc[0],cc[1],cc[2],cc[3]);
}

/**************************************************************************
 *                              mmioStringToFOURCCW     [WINMM.132]
 */
FOURCC WINAPI mmioStringToFOURCCW(LPCWSTR sz, UINT uFlags)
{
    LPSTR       szA = HEAP_strdupWtoA(GetProcessHeap(),0,sz);
    FOURCC      ret = mmioStringToFOURCCA(szA,uFlags);
    
    HeapFree(GetProcessHeap(),0,szA);
    return ret;
}

/**************************************************************************
 *                              mmioStringToFOURCC      [MMSYSTEM.1220]
 */
FOURCC WINAPI mmioStringToFOURCC16(LPCSTR sz, UINT16 uFlags)
{
    return mmioStringToFOURCCA(sz, uFlags);
}

/**************************************************************************
 *              mmioInstallIOProc16    [MMSYSTEM.1221]
 */
LPMMIOPROC16 WINAPI mmioInstallIOProc16(FOURCC fccIOProc, LPMMIOPROC16 pIOProc,
                                        DWORD dwFlags)
{
    return (LPMMIOPROC16)MMIO_InstallIOProc(fccIOProc, (LPMMIOPROC)pIOProc, 
                                            dwFlags, MMIO_PROC_16); 
}

/**************************************************************************
 *                              mmioInstallIOProcA         [WINMM.120]
 */
LPMMIOPROC WINAPI mmioInstallIOProcA(FOURCC fccIOProc, 
                                     LPMMIOPROC pIOProc, DWORD dwFlags)
{
    return MMIO_InstallIOProc(fccIOProc, pIOProc, dwFlags, MMIO_PROC_32A);
}

/**************************************************************************
 *                              mmioInstallIOProcW         [WINMM.]
 */
LPMMIOPROC WINAPI mmioInstallIOProcW(FOURCC fccIOProc, 
                                     LPMMIOPROC pIOProc, DWORD dwFlags)
{
    return MMIO_InstallIOProc(fccIOProc, pIOProc, dwFlags, MMIO_PROC_32W);
}

/**************************************************************************
 *                              mmioSendMessage16       [MMSYSTEM.1222]
 */
LRESULT WINAPI mmioSendMessage16(HMMIO16 hmmio, UINT16 uMessage,
                                 LPARAM lParam1, LPARAM lParam2)
{
    LPWINE_MMIO         wm;
    
    TRACE("(%04X, %u, %ld, %ld)\n", hmmio, uMessage, lParam1, lParam2);

    if (uMessage < MMIOM_USER)
        return MMSYSERR_INVALPARAM;
    
    if ((wm = MMIO_Get(NULL, hmmio)) == NULL)
        return MMSYSERR_INVALHANDLE;
    
    return MMIO_SendMessage(wm, uMessage, lParam1, lParam2, MMIO_PROC_16);
}

/**************************************************************************
 *                              mmioSendMessage         [WINMM.]
 */
LRESULT WINAPI mmioSendMessage(HMMIO hmmio, UINT uMessage,
                               LPARAM lParam1, LPARAM lParam2)
{
    LPWINE_MMIO         wm;
    
    TRACE("(%04X, %u, %ld, %ld)\n", hmmio, uMessage, lParam1, lParam2);

    if (uMessage < MMIOM_USER)
        return MMSYSERR_INVALPARAM;
    
    if ((wm = MMIO_Get(NULL, hmmio)) == NULL)
        return MMSYSERR_INVALHANDLE;
    
    return MMIO_SendMessage(wm, uMessage, lParam1, lParam2, MMIO_PROC_32A);
}

/**************************************************************************
 *                              mmioDescend             [MMSYSTEM.1223]
 */
UINT WINAPI mmioDescend(HMMIO hmmio, LPMMCKINFO lpck,
                        const MMCKINFO* lpckParent, UINT uFlags)
{
    DWORD               dwOldPos;
    FOURCC              srchCkId;
    FOURCC              srchType;
    
    
    TRACE("(%04X, %p, %p, %04X);\n", hmmio, lpck, lpckParent, uFlags);
    
    if (lpck == NULL)
        return MMSYSERR_INVALPARAM;
    
    dwOldPos = mmioSeek(hmmio, 0, SEEK_CUR);
    TRACE("dwOldPos=%ld\n", dwOldPos);
    
    if (lpckParent != NULL) {
        TRACE("seek inside parent at %ld !\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. 
     */
    
    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;
    }
    
    if (uFlags & (MMIO_FINDCHUNK|MMIO_FINDLIST|MMIO_FINDRIFF)) {
        TRACE("searching for %.4s.%.4s\n", 
              (LPSTR)&srchCkId,
              srchType?(LPSTR)&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);
            if (ix < lpck->dwDataOffset - dwOldPos) {
                mmioSeek(hmmio, dwOldPos, SEEK_SET);
                WARN("return ChunkNotFound\n");
                return MMIOERR_CHUNKNOTFOUND;
            }
            TRACE("ckid=%.4s fcc=%.4s cksize=%08lX !\n",
                  (LPSTR)&lpck->ckid, 
                  srchType?(LPSTR)&lpck->fccType:"<na>",
                  lpck->cksize);
            if ((srchCkId == lpck->ckid) &&
                (!srchType || (srchType == lpck->fccType))
                )
                break;
            
            dwOldPos = lpck->dwDataOffset + ((lpck->cksize + 1) & ~1);
            mmioSeek(hmmio, dwOldPos, SEEK_SET);
        }
    } else {
        /* FIXME: unverified, does it do this? */
        /* NB: This part is used by WAVE_mciOpen, among others */
        if (mmioRead(hmmio, (LPSTR)lpck, 3 * sizeof(DWORD)) < 3 * sizeof(DWORD)) {
            mmioSeek(hmmio, dwOldPos, SEEK_SET);
            WARN("return ChunkNotFound 2nd\n");
            return MMIOERR_CHUNKNOTFOUND;
        }
        lpck->dwDataOffset = dwOldPos + 2 * sizeof(DWORD);
    }
    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);
    TRACE("lpck: ckid=%.4s, cksize=%ld, dwDataOffset=%ld fccType=%08lX (%.4s)!\n", 
          (LPSTR)&lpck->ckid, lpck->cksize, lpck->dwDataOffset, 
          lpck->fccType, srchType?(LPSTR)&lpck->fccType:"");
    return 0;
}

/**************************************************************************
 *                              mmioDescend16           [MMSYSTEM.1223]
 */
UINT16 WINAPI mmioDescend16(HMMIO16 hmmio, LPMMCKINFO lpck,
                            const MMCKINFO* lpckParent, UINT16 uFlags)
{
    return mmioDescend(hmmio, lpck, lpckParent, uFlags);
}

/**************************************************************************
 *                              mmioAscend              [WINMM.113]
 */
UINT WINAPI mmioAscend(HMMIO hmmio, LPMMCKINFO lpck, UINT uFlags)
{
    TRACE("(%04X, %p, %04X);\n", hmmio, lpck, uFlags);
    
    if (lpck->dwFlags & MMIO_DIRTY) {
        DWORD   dwOldPos, dwNewSize, dwSizePos;
        
        TRACE("chunk is marked MMIO_DIRTY, correcting chunk size\n");
        dwOldPos = mmioSeek(hmmio, 0, SEEK_CUR);
        TRACE("dwOldPos=%ld\n", dwOldPos);
        dwNewSize = dwOldPos - lpck->dwDataOffset;
        if (dwNewSize != lpck->cksize) {
            TRACE("dwNewSize=%ld\n", dwNewSize);
            lpck->cksize = dwNewSize;
            
            dwSizePos = lpck->dwDataOffset - sizeof(DWORD);
            TRACE("dwSizePos=%ld\n", dwSizePos);
            
            mmioSeek(hmmio, dwSizePos, SEEK_SET);
            mmioWrite(hmmio, (LPSTR)&dwNewSize, sizeof(DWORD));
        }
    }
    
    mmioSeek(hmmio, lpck->dwDataOffset + ((lpck->cksize + 1) & ~1), SEEK_SET);
    
    return 0;
}

/**************************************************************************
 *                              mmioAscend              [MMSYSTEM.1224]
 */
UINT16 WINAPI mmioAscend16(HMMIO16 hmmio, MMCKINFO* lpck, UINT16 uFlags)
{
    return mmioAscend(hmmio,lpck,uFlags);
}

/**************************************************************************
 *                              mmioCreateChunk         [MMSYSTEM.1225]
 */
UINT16 WINAPI mmioCreateChunk16(HMMIO16 hmmio, MMCKINFO* lpck, UINT16 uFlags)
{
    DWORD       dwOldPos;
    LONG        size;
    LONG        ix;
    
    TRACE("(%04X, %p, %04X);\n", hmmio, lpck, uFlags);
    
    dwOldPos = mmioSeek(hmmio, 0, SEEK_CUR);
    TRACE("dwOldPos=%ld\n", dwOldPos);
    
    if (uFlags == MMIO_CREATELIST)
        lpck->ckid = FOURCC_LIST;
    else if (uFlags == MMIO_CREATERIFF)
        lpck->ckid = FOURCC_RIFF;
    
    TRACE("ckid=%08lX\n", 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 = %ld req = %ld, errno = %d\n",ix, size, errno);
    if (ix < size) {
        mmioSeek(hmmio, dwOldPos, SEEK_SET);
        WARN("return CannotWrite\n");
        return MMIOERR_CANNOTWRITE;
    }
    
    return 0;
}

/**************************************************************************
 *                      mmioCreateChunk                         [WINMM.115]
 */
UINT WINAPI mmioCreateChunk(HMMIO hmmio, MMCKINFO* lpck, UINT uFlags)
{
    return mmioCreateChunk16(hmmio, lpck, uFlags);
}

/**************************************************************************
 *                              mmioRename              [MMSYSTEM.1226]
 */
UINT16 WINAPI mmioRename16(LPCSTR szFileName, LPCSTR szNewFileName,
                           MMIOINFO16* lpmmioinfo, DWORD dwRenameFlags)
{
    UINT16              result = MMSYSERR_ERROR;
    LPMMIOPROC16        ioProc;

    TRACE("('%s', '%s', %p, %08lX);\n",
          szFileName, szNewFileName, lpmmioinfo, dwRenameFlags);
    
    /* If both params are NULL, then parse the file name */
    if (lpmmioinfo && lpmmioinfo->fccIOProc == 0 && lpmmioinfo->pIOProc == NULL)
        lpmmioinfo->fccIOProc = MMIO_ParseExt(szFileName);

    /* Handle any unhandled/error case from above. Assume DOS file */
    if (!lpmmioinfo || (lpmmioinfo->fccIOProc == 0 && lpmmioinfo->pIOProc == NULL))
        ioProc = (LPMMIOPROC16)mmioDosIOProc;
    /* if just the four character code is present, look up IO proc */
    else if (lpmmioinfo->pIOProc == NULL)
        ioProc = mmioInstallIOProc16(lpmmioinfo->fccIOProc, NULL, MMIO_FINDPROC);
    else
        ioProc = lpmmioinfo->pIOProc;

    /* FIXME: ioProc is likely a segmented address, thus needing a
     * thunk somewhere. The main issue is that Wine's current thunking
     * 32 to 16 only supports pascal calling convention
     */
    if (ioProc) 
        result = (ioProc)(0, MMIOM_RENAME, 
                          (LPARAM)szFileName, (LPARAM)szNewFileName);
    
    return result;
}

/**************************************************************************
 *                              mmioRenameA                     [WINMM.125]
 */
UINT WINAPI mmioRenameA(LPCSTR szFileName, LPCSTR szNewFileName,
                        MMIOINFO* lpmmioinfo, DWORD dwRenameFlags)
{
    UINT        result = MMSYSERR_ERROR;
    LPMMIOPROC  ioProc;

    TRACE("('%s', '%s', %p, %08lX);\n",
          szFileName, szNewFileName, lpmmioinfo, dwRenameFlags);

    /* If both params are NULL, then parse the file name */
    if (lpmmioinfo && lpmmioinfo->fccIOProc == 0 && lpmmioinfo->pIOProc == NULL)
        lpmmioinfo->fccIOProc = MMIO_ParseExt(szFileName);

    /* Handle any unhandled/error case from above. Assume DOS file */
    if (!lpmmioinfo || (lpmmioinfo->fccIOProc == 0 && lpmmioinfo->pIOProc == NULL))
        ioProc = (LPMMIOPROC)mmioDosIOProc;
    /* if just the four character code is present, look up IO proc */
    else if (lpmmioinfo->pIOProc == NULL)
        ioProc = MMIO_InstallIOProc(lpmmioinfo->fccIOProc, NULL, 
                                    MMIO_FINDPROC, MMIO_PROC_32A);
    else /* use relevant ioProc */
        ioProc = lpmmioinfo->pIOProc;

    if (ioProc) 
        result = (ioProc)(0, MMIOM_RENAME, 
                          (LPARAM)szFileName, (LPARAM)szNewFileName);
    
    return result;
}

/**************************************************************************
 *                              mmioRenameW                     [WINMM.126]
 */
UINT WINAPI mmioRenameW(LPCWSTR szFileName, LPCWSTR szNewFileName,
                        MMIOINFO* lpmmioinfo, DWORD dwRenameFlags)
{
    LPSTR       szFn = HEAP_strdupWtoA(GetProcessHeap(), 0, szFileName);
    LPSTR       sznFn = HEAP_strdupWtoA(GetProcessHeap(), 0, szNewFileName);
    UINT        ret = mmioRenameA(szFn, sznFn, lpmmioinfo, dwRenameFlags);
    
    HeapFree(GetProcessHeap(),0,szFn);
    HeapFree(GetProcessHeap(),0,sznFn);
    return ret;
}