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Added support for the addition and removal of custom I/O preocedures.

This commit is contained in:
Ulrich Czekalla 1999-10-31 02:25:32 +00:00 committed by Alexandre Julliard
parent 3a2b1b6e42
commit 9e2f14fb63
1 changed files with 80 additions and 17 deletions
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97
dlls/winmm/mmio.c
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@ -873,9 +873,32 @@ FOURCC WINAPI mmioStringToFOURCC16(LPCSTR sz, UINT16 uFlags)
/**************************************************************************
* mmioInstallIOProc16 [MMSYSTEM.1221]
*/
/* maximum number of I/O procedures which can be installed */
struct IOProcList
{
struct IOProcList *pNext; /* Next item in linked list */
FOURCC fourCC; /* four-character code identifying IOProc */
LPMMIOPROC16 pIOProc; /* pointer to IProc */
};
/* This array will be the entire list for most apps */
static struct IOProcList defaultProcs[] = {
{ &defaultProcs[1], (FOURCC) FOURCC_DOS,(LPMMIOPROC16) mmioDosIOProc },
{ NULL, (FOURCC) FOURCC_MEM,(LPMMIOPROC16) mmioMemIOProc },
};
static struct IOProcList *pIOProcListAnchor = &defaultProcs[0];
LPMMIOPROC16 WINAPI mmioInstallIOProc16(FOURCC fccIOProc,
LPMMIOPROC16 pIOProc, DWORD dwFlags)
{
LPMMIOPROC16 lpProc = NULL;
struct IOProcList *pListNode;
TRACE("(%ld, %p, %08lX)\n",
fccIOProc, pIOProc, dwFlags);
@ -886,19 +909,64 @@ LPMMIOPROC16 WINAPI mmioInstallIOProc16(FOURCC fccIOProc,
/* just handle the known procedures for now */
switch(dwFlags & (MMIO_INSTALLPROC|MMIO_REMOVEPROC|MMIO_FINDPROC)) {
case MMIO_INSTALLPROC:
return NULL;
/* Create new entry for the IOProc list */
pListNode = HeapAlloc(GetProcessHeap(),0,sizeof(*pListNode));
if (pListNode)
{
/* Find the end of the list, so we can add our new entry to it */
struct IOProcList *pListEnd = pIOProcListAnchor;
while (pListEnd->pNext)
pListEnd = pListEnd->pNext;
/* Fill in this node */
pListNode->fourCC = fccIOProc;
pListNode->pIOProc = pIOProc;
/* Stick it on the end of the list */
pListEnd->pNext = pListNode;
pListNode->pNext = NULL;
/* Return this IOProc - that's how the caller knows we succeeded */
lpProc = pIOProc;
};
break;
case MMIO_REMOVEPROC:
return NULL;
/*
* 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
*/
pListNode = pIOProcListAnchor;
while (pListNode && pListNode->pNext->fourCC != fccIOProc)
pListNode = pListNode->pNext;
/* If we found it, remove it, but only if it isn't builtin */
if (pListNode &&
((pListNode >= defaultProcs) && (pListNode < defaultProcs + sizeof(defaultProcs))))
{
/* Okay, nuke it */
pListNode->pNext = pListNode->pNext->pNext;
HeapFree(GetProcessHeap(),0,pListNode);
};
break;
case MMIO_FINDPROC:
if (fccIOProc == FOURCC_DOS)
return (LPMMIOPROC16) mmioDosIOProc;
else if (fccIOProc == FOURCC_MEM)
return (LPMMIOPROC16) mmioMemIOProc;
else
return NULL;
default:
return NULL;
/* Iterate through the list looking for this proc identified by fourCC */
for (pListNode = pIOProcListAnchor; pListNode; pListNode=pListNode->pNext)
{
if (pListNode->fourCC == fccIOProc)
{
lpProc = pListNode->pIOProc;
break;
};
};
break;
}
return lpProc;
}
/**************************************************************************
@ -907,13 +975,8 @@ LPMMIOPROC16 WINAPI mmioInstallIOProc16(FOURCC fccIOProc,
LPMMIOPROC WINAPI mmioInstallIOProcA(FOURCC fccIOProc,
LPMMIOPROC pIOProc, DWORD dwFlags)
{
FIXME("(%c%c%c%c,%p,0x%08lx) -- empty stub \n",
(char)((fccIOProc&0xff000000)>>24),
(char)((fccIOProc&0x00ff0000)>>16),
(char)((fccIOProc&0x0000ff00)>> 8),
(char)(fccIOProc&0x000000ff),
pIOProc, dwFlags );
return 0;
return (LPMMIOPROC) mmioInstallIOProc16(fccIOProc,
(LPMMIOPROC16)pIOProc, dwFlags);
}
/**************************************************************************