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windows-xp/Source/XPSP1/NT/multimedia/media/winmm/drvr.c

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/******************************************************************************
Copyright (c) 1985-2001 Microsoft Corporation
Title: drvr.c - Installable driver code. Common code
Version: 1.00
Date: 10-Jun-1990
Author: DAVIDDS ROBWI
------------------------------------------------------------------------------
Change log:
DATE REV DESCRIPTION
----------- ----- -----------------------------------------------------------
10-JUN-1990 ROBWI From windows 3.1 installable driver code by davidds
28-FEB-1992 ROBINSP Port to NT
*****************************************************************************/
#include <windows.h>
#include <winmmi.h>
#include <stdlib.h>
#include <string.h>
#include "drvr.h"
int cInstalledDrivers = 0; // Count of installed drivers
HANDLE hInstalledDriverList = 0; // List of installed drivers
typedef LONG (FAR PASCAL *SENDDRIVERMESSAGE31)(HANDLE, UINT, LPARAM, LPARAM);
typedef LRESULT (FAR PASCAL *DEFDRIVERPROC31)(DWORD_PTR, HANDLE, UINT, LPARAM, LPARAM);
extern SENDDRIVERMESSAGE31 lpSendDriverMessage;
extern DEFDRIVERPROC31 lpDefDriverProc;
extern void lstrncpyW (LPWSTR pszTarget, LPCWSTR pszSource, size_t cch);
__inline PWSTR lstrDuplicateW(PCWSTR pstr)
{
PWSTR pstrDuplicate = (PWSTR)HeapAlloc(hHeap, 0, (lstrlenW(pstr)+1)*sizeof(WCHAR));
if (pstrDuplicate) lstrcpyW(pstrDuplicate, pstr);
return pstrDuplicate;
}
//============================================================================
// Basic hash helpers taken from LKRhash
//============================================================================
// Produce a scrambled, randomish number in the range 0 to RANDOM_PRIME-1.
// Applying this to the results of the other hash functions is likely to
// produce a much better distribution, especially for the identity hash
// functions such as Hash(char c), where records will tend to cluster at
// the low end of the hashtable otherwise. LKRhash applies this internally
// to all hash signatures for exactly this reason.
__inline DWORD
HashScramble(DWORD dwHash)
{
// Here are 10 primes slightly greater than 10^9
// 1000000007, 1000000009, 1000000021, 1000000033, 1000000087,
// 1000000093, 1000000097, 1000000103, 1000000123, 1000000181.
// default value for "scrambling constant"
const DWORD RANDOM_CONSTANT = 314159269UL;
// large prime number, also used for scrambling
const DWORD RANDOM_PRIME = 1000000007UL;
return (RANDOM_CONSTANT * dwHash) % RANDOM_PRIME ;
}
// Small prime number used as a multiplier in the supplied hash functions
const DWORD HASH_MULTIPLIER = 101;
#undef HASH_SHIFT_MULTIPLY
#ifdef HASH_SHIFT_MULTIPLY
# define HASH_MULTIPLY(dw) (((dw) << 7) - (dw))
#else
# define HASH_MULTIPLY(dw) ((dw) * HASH_MULTIPLIER)
#endif
// Fast, simple hash function that tends to give a good distribution.
// Apply HashScramble to the result if you're using this for something
// other than LKRhash.
__inline DWORD
HashStringA(
const char* psz,
DWORD dwHash)
{
// force compiler to use unsigned arithmetic
const unsigned char* upsz = (const unsigned char*) psz;
for ( ; *upsz; ++upsz)
dwHash = HASH_MULTIPLY(dwHash) + *upsz;
return dwHash;
}
// Unicode version of above
__inline DWORD
HashStringW(
const wchar_t* pwsz,
DWORD dwHash)
{
for ( ; *pwsz; ++pwsz)
dwHash = HASH_MULTIPLY(dwHash) + *pwsz;
return dwHash;
}
// Quick-'n'-dirty case-insensitive string hash function.
// Make sure that you follow up with _stricmp or _mbsicmp. You should
// also cache the length of strings and check those first. Caching
// an uppercase version of a string can help too.
// Again, apply HashScramble to the result if using with something other
// than LKRhash.
// Note: this is not really adequate for MBCS strings.
__inline DWORD
HashStringNoCase(
const char* psz,
DWORD dwHash)
{
const unsigned char* upsz = (const unsigned char*) psz;
for ( ; *upsz; ++upsz)
dwHash = HASH_MULTIPLY(dwHash)
+ (*upsz & 0xDF); // strip off lowercase bit
return dwHash;
}
// Unicode version of above
__inline DWORD
HashStringNoCaseW(
const wchar_t* pwsz,
DWORD dwHash)
{
for ( ; *pwsz; ++pwsz)
dwHash = HASH_MULTIPLY(dwHash) + (*pwsz & 0xFFDF);
return dwHash;
}
/*
FYI here are the first bunch of prime numbers up to around 1000
2 3 5 7 11 13 17 19 23 29
31 37 41 43 47 53 59 61 67 71
73 79 83 89 97 101 103 107 109 113
127 131 137 139 149 151 157 163 167 173
179 181 191 193 197 199 211 223 227 229
233 239 241 251 257 263 269 271 277 281
283 293 307 311 313 317 331 337 347 349
353 359 367 373 379 383 389 397 401 409
419 421 431 433 439 443 449 457 461 463
467 479 487 491 499 503 509 521 523 541
547 557 563 569 571 577 587 593 599 601
607 613 617 619 631 641 643 647 653 659
661 673 677 683 691 701 709 719 727 733
739 743 751 757 761 769 773 787 797 809
811 821 823 827 829 839 853 857 859 863
877 881 883 887 907 911 919 929 937 941
947 953 967 971 977 983 991 997 1009 1013
*/
//============================================================================
// StringId dictionary
//============================================================================
#define HASH_TABLESIZE (127)
PMMDRV StringIdDict[HASH_TABLESIZE];
/*****************************************************************************
* @doc INTERNAL
*
* @api MMRESULT | StringId_Create | This function creates a unique string
* identifying a particular MME device. The string can be used to
* subsequently retrieve the ID for the same MME device even if the devices
* have been renumbered.
*
* @parm IN PMMDRV | pdrv | Pointer to an MME driver.
*
* @parm IN UINT | port | Driver-relative device ID.
*
* @parm OPTIONAL OUT PWSTR* | pStringId | Address of a buffer to receive the
* pointer to the string.
*
* @parm OPTIONAL OUT ULONG* | pcbStringId | Receives size of buffer required
* to store the string.
* @rdesc MMRESULT | Zero if successfull otherwise an error code defined
* in mmsystem.h.
*
* @comm The string is allocated by this function using the heap identified
* by the global variable hHeap. The caller is responsible for ensuring
* the string is freed.
*
****************************************************************************/
MMRESULT StringId_Create(IN PMMDRV pdrv, IN UINT port, OUT PWSTR* pStringId, OUT ULONG* pcbStringId)
{
MMRESULT mmr;
int cchStringId;
PWSTR StringId;
LONG StringIdType;
PCWSTR StringIdBase;
// 8 chars type field + next colon delimiter
cchStringId = 8 + 1;
if (pdrv->cookie)
{
// 8 chars for device interface length field + next colon delimiter
cchStringId += 8 + 1;
// device interface name + next colon delimiter
cchStringId += lstrlenW(pdrv->cookie) + 1;
StringIdType = 1;
StringIdBase = pdrv->cookie;
}
else
{
// file name + next colon delimiter
cchStringId += lstrlenW(pdrv->wszDrvEntry) + 1;
StringIdType = 0;
StringIdBase = pdrv->wszDrvEntry;
}
// message proc name + next colon delimiter
cchStringId += lstrlenW(pdrv->wszMessage) + 1;
// 8 chars driver-relative ID, 1 terminator
cchStringId += 8 + 1;
mmr = MMSYSERR_NOERROR;
if (pStringId)
{
StringId = HeapAlloc(hHeap, 0, cchStringId * sizeof(WCHAR));
if (StringId)
{
int cchPrinted;
switch (StringIdType)
{
case 0:
cchPrinted = swprintf(StringId, L"%08X:%s:%s:%08X", StringIdType, StringIdBase, pdrv->wszMessage, port);
break;
case 1:
cchPrinted = swprintf(StringId, L"%08X:%08X:%s:%s:%08X", StringIdType, lstrlenW(StringIdBase), StringIdBase, pdrv->wszMessage, port);
break;
default:
WinAssert(FALSE);
break;
}
WinAssert(cchPrinted < cchStringId);
*pStringId = StringId;
// dprintf(("StringId_Create : note: created StringId=\"%ls\"", StringId));
}
else
{
mmr = MMSYSERR_NOMEM;
}
}
if (!mmr && pcbStringId) *pcbStringId = cchStringId * sizeof(WCHAR);
return mmr;
}
/*****************************************************************************
* @doc INTERNAL
*
* @api MMRESULT | StringIdDict_Initialize | This function ensures the
* dictionary is initialized. It should be called by any function that uses
* the dictionary
*
* @rdesc void
*
****************************************************************************/
void StringIdDict_Initialize(void)
{
int i;
static BOOL fInitialized = FALSE;
if (fInitialized) return;
for (i = 0; i < (sizeof(StringIdDict)/sizeof(StringIdDict[0])); i++) StringIdDict[i] = NULL;
fInitialized = TRUE;
}
MMRESULT StringIdDict_SearchType0And1(IN ULONG Type, IN PWSTR pstrTypeXData, IN ULONG HashAx, OUT PMMDRV *ppdrv, OUT UINT *pport)
{
PWSTR pstrDriver = NULL;
PWSTR pstrMessage = NULL;
PWSTR pstrPort = NULL;
PWSTR pstr = pstrTypeXData;
MMRESULT mmr = MMSYSERR_NOERROR;
WinAssert((0 == Type) || (1 == Type));
if (0 == Type)
{
// "<driver-filename>:<driver-message-proc-name>:<driver-port>"
pstrDriver = pstr;
pstrMessage = wcschr(pstrDriver, L':');
if (pstrMessage) *pstrMessage++ = L'\0';
}
else // 1 == Type
{
// "<driver-device-interface-length>:<driver-device-interface>:<driver-message-proc-name>:<driver-port>"
int cchDeviceInterface = wcstol(pstr, &pstrDriver, 16);
if (L':' != *pstrDriver) pstrDriver = NULL;
if (pstrDriver) {
*pstrDriver++ = L'\0';
pstrMessage = pstrDriver + cchDeviceInterface;
if (L':' == *pstrMessage) *pstrMessage++ = L'\0';
else pstrMessage = NULL;
}
}
if (pstrMessage)
{
pstrPort = wcschr(pstrMessage, L':');
if (pstrPort) *pstrPort++ = L'\0';
}
// now hash the substrings and search the hash chain for a match
if (pstrDriver && pstrMessage && pstrPort)
{
UINT port;
PMMDRV pdrv;
int cHashMisses;
PWCHAR pch;
HashAx = HashStringNoCaseW(pstrDriver, HashAx);
HashAx = HashStringNoCaseW(pstrMessage, HashAx);
HashAx = HashScramble(HashAx) % HASH_TABLESIZE;
mmr = MMSYSERR_NODRIVER;
port = wcstol(pstrPort, &pch, 16);
for (pdrv = StringIdDict[HashAx], cHashMisses = 0;
pdrv;
pdrv = pdrv->NextStringIdDictNode, cHashMisses++)
{
if (0 == Type)
{
if (pdrv->cookie) continue;
if (lstrcmpiW(pdrv->wszDrvEntry, pstrDriver)) continue;
}
else // 1 == Type
{
if (!pdrv->cookie) continue;
if (lstrcmpiW(pdrv->cookie, pstrDriver)) continue;
}
if (lstrcmpiW(pdrv->wszMessage, pstrMessage)) continue;
*ppdrv = pdrv;
*pport = port;
if (cHashMisses) dprintf(("StringIdDict_SearchType0And1 : note: %d hash misses", cHashMisses));
mmr = MMSYSERR_NOERROR;
break;
}
}
else
{
mmr = MMSYSERR_INVALPARAM;
}
return mmr;
}
MMRESULT StringIdDict_Search(IN PCWSTR InStringId, OUT PMMDRV *ppdrv, OUT UINT *pport)
{
PWSTR StringId;
MMRESULT mmr = MMSYSERR_NOERROR;
StringIdDict_Initialize();
StringId = lstrDuplicateW(InStringId);
if (StringId)
{
ULONG Type;
PWSTR pstr;
PWSTR pstrType;
pstr = StringId;
pstrType = pstr;
Type = wcstol(pstrType, &pstr, 16);
if (*pstr == L':')
{
ULONG HashAx; // Hash accumulator
*pstr++ = L'\0';
HashAx = HashStringNoCaseW(pstrType, 0);
switch (Type)
{
case 0:
mmr = StringIdDict_SearchType0And1(Type, pstr, HashAx, ppdrv, pport);
break;
case 1:
mmr = StringIdDict_SearchType0And1(Type, pstr, HashAx, ppdrv, pport);
break;
default:
mmr = MMSYSERR_INVALPARAM;
break;
}
}
else
{
mmr = MMSYSERR_INVALPARAM;
}
HeapFree(hHeap, 0, StringId);
}
else
{
mmr = MMSYSERR_NOMEM;
}
if (mmr) dprintf(("StringIdDict_Search : error: returning mmresult %d", mmr));
return mmr;
}
void StringIdDict_Insert(PMMDRV pdrv)
{
ULONG HashAx;
MMRESULT mmr;
StringIdDict_Initialize();
if (!pdrv->cookie)
{
HashAx = HashStringNoCaseW(L"00000000", 0);
HashAx = HashStringNoCaseW(pdrv->wszDrvEntry, HashAx);
}
else
{
HashAx = HashStringNoCaseW(L"00000001", 0);
HashAx = HashStringNoCaseW(pdrv->cookie, HashAx);
}
HashAx = HashStringNoCaseW(pdrv->wszMessage, HashAx);
HashAx = HashScramble(HashAx) % HASH_TABLESIZE;
// dprintf(("StringIdDict_Insert : note: driver hashed to %d", HashAx));
pdrv->NextStringIdDictNode = StringIdDict[HashAx];
pdrv->PrevStringIdDictNode = NULL;
if (pdrv->NextStringIdDictNode) pdrv->NextStringIdDictNode->PrevStringIdDictNode = pdrv;
StringIdDict[HashAx] = pdrv;
#if DBG
{
// Checking the consistency of the driver lists and the hash table
UINT cDriversHash = 0;
UINT cDrivers = 0;
UINT ii;
PMMDRV pLink, pStart;
for (ii = (sizeof(StringIdDict)/sizeof(StringIdDict[0])); ii; ii--)
{
for (pLink = StringIdDict[ii-1]; pLink; pLink = pLink->NextStringIdDictNode)
{
cDriversHash++;
}
}
for (pStart = (PMMDRV)&waveoutdrvZ, pLink = pStart->Next; pLink != pStart; pLink = pLink->Next)
cDrivers++;
for (pStart = (PMMDRV)&waveindrvZ, pLink = pStart->Next; pLink != pStart; pLink = pLink->Next)
cDrivers++;
for (pStart = (PMMDRV)&midioutdrvZ, pLink = pStart->Next; pLink != pStart; pLink = pLink->Next)
cDrivers++;
for (pStart = (PMMDRV)&midiindrvZ, pLink = pStart->Next; pLink != pStart; pLink = pLink->Next)
cDrivers++;
for (pStart = (PMMDRV)&mixerdrvZ, pLink = pStart->Next; pLink != pStart; pLink = pLink->Next)
cDrivers++;
for (pStart = (PMMDRV)&auxdrvZ, pLink = pStart->Next; pLink != pStart; pLink = pLink->Next)
cDrivers++;
WinAssert(cDriversHash == cDrivers);
}
#endif // DBG
return;
}
void StringIdDict_Remove(PMMDRV pdrv)
{
if (pdrv->NextStringIdDictNode) pdrv->NextStringIdDictNode->PrevStringIdDictNode = pdrv->PrevStringIdDictNode;
if (pdrv->PrevStringIdDictNode) {
pdrv->PrevStringIdDictNode->NextStringIdDictNode = pdrv->NextStringIdDictNode;
} else {
int i;
for ( i = 0; i < HASH_TABLESIZE; i++ ) {
if (pdrv == StringIdDict[i]) {
StringIdDict[i] = pdrv->NextStringIdDictNode;
break;
}
}
WinAssert(i != HASH_TABLESIZE);
}
#if DBG
{
// Checking the consistency of the driver lists and the hash table
UINT cDriversHash = 0;
UINT cDrivers = 0;
UINT ii;
PMMDRV pLink, pStart;
for (ii = (sizeof(StringIdDict)/sizeof(StringIdDict[0])); ii; ii--)
{
for (pLink = StringIdDict[ii-1]; pLink; pLink = pLink->NextStringIdDictNode)
{
cDriversHash++;
}
}
for (pStart = (PMMDRV)&waveoutdrvZ, pLink = pStart->Next; pLink != pStart; pLink = pLink->Next)
cDrivers++;
for (pStart = (PMMDRV)&waveindrvZ, pLink = pStart->Next; pLink != pStart; pLink = pLink->Next)
cDrivers++;
for (pStart = (PMMDRV)&midioutdrvZ, pLink = pStart->Next; pLink != pStart; pLink = pLink->Next)
cDrivers++;
for (pStart = (PMMDRV)&midiindrvZ, pLink = pStart->Next; pLink != pStart; pLink = pLink->Next)
cDrivers++;
for (pStart = (PMMDRV)&mixerdrvZ, pLink = pStart->Next; pLink != pStart; pLink = pLink->Next)
cDrivers++;
for (pStart = (PMMDRV)&auxdrvZ, pLink = pStart->Next; pLink != pStart; pLink = pLink->Next)
cDrivers++;
cDrivers--; // to account for the driver we just removed.
WinAssert(cDriversHash == cDrivers);
}
#endif // DBG
}
//=============================================================================
//=== Misc Utilities ===
//=============================================================================
/***************************************************************************
*
* @doc INTERNAL
*
* @api void | winmmGetBuildYearAndMonth | Returns build year and month
* of this source file.
*
* @parm unsigned* | pBuildYear | Receives build year.
*
* @parm unsigned* | pBuildMonth | Receives build month.
*
* @rdesc No return value.
*
* @comm Computes build year and month based on compiler macro __DATE__
*
***************************************************************************/
void winmmGetBuildYearAndMonth(unsigned *pBuildYear, unsigned *pBuildMonth)
{
char szBuildDate[] = __DATE__;
char *Month[12] = {"Jan", "Feb", "Mar",
"Apr", "May", "Jun",
"Jul", "Aug", "Sep",
"Oct", "Nov", "Dec"};
char szBuildMonth[4];
int i;
lstrcpynA(szBuildMonth, szBuildDate, 4);
szBuildMonth[3] = '\0';
for (i = 0; i < 12; i++)
{
if (!lstrcmpiA(Month[i], szBuildMonth)) break;
}
WinAssert(i < 12);
*pBuildMonth = i + 1;
*pBuildYear = atoi(&szBuildDate[7]);
return;
}
/***************************************************************************
*
* @doc INTERNAL
*
* @api BOOL | winmmFileTimeIsPreXp | Determines whether given filetime is
* before approximate XP ship date.
*
* @parm FILETIME* | FileTime | Points to file time to check.
*
* @rdesc BOOL | TRUE if file time is before approximate XP ship date
*
* @comm This is based on the build date of this source module, or the
* anticipated Windows XP RC2 ship month, whichever is later.
*
***************************************************************************/
BOOL winmmFileTimeIsPreXp(CONST FILETIME *FileTime)
{
const unsigned XpRc2Month = 7;
const unsigned XpRc2Year = 2001;
SYSTEMTIME SystemTime;
BOOL fPreXp = FALSE;
if (FileTimeToSystemTime(FileTime, &SystemTime))
{
unsigned BuildYear, BuildMonth;
winmmGetBuildYearAndMonth(&BuildYear, &BuildMonth);
if (BuildYear > XpRc2Year) {
BuildYear = XpRc2Year;
BuildMonth = XpRc2Month;
} else if ((BuildYear == XpRc2Year) && (BuildMonth > XpRc2Month)) {
BuildMonth = XpRc2Month;
}
if ((SystemTime.wYear < BuildYear) ||
((SystemTime.wYear == BuildYear) && (SystemTime.wMonth < BuildMonth)))
{
fPreXp = TRUE;
}
}
return fPreXp;
}
/***************************************************************************
*
* @doc INTERNAL
*
* @api LONG | InternalBroadcastDriverMessage | Send a message to a
* range of drivers.
*
* @parm UINT | hDriverStart | index of first driver to send message to
*
* @parm UINT | message | Message to broadcast.
*
* @parm LONG | lParam1 | First message parameter.
*
* @parm LONG | lParam2 | Second message parameter.
*
* @parm UINT | flags | defines range of drivers as follows:
*
* @flag IBDM_SENDMESSAGE | Only send message to hDriverStart.
*
* @flag IBDM_ONEINSTANCEONLY | This flag is ignored if IBDM_SENDMESSAGE is
* set. Only send message to single instance of each driver.
*
* @flag IBDM_REVERSE | This flag is ignored if IBDM_SENDMESSAGE is set.
* Send message to drivers with indices between
* hDriverStart and 1 instead of hDriverStart and cInstalledDrivers.
* If IBDM_REVERSE is set and hDriverStart is 0 then send messages
* to drivers with indices between cInstalledDrivers and 1.
*
* @rdesc returns non-zero if message was broadcast. If the IBDM_SENDMESSAGE
* flag is set, returns the return result from the driver proc.
*
***************************************************************************/
LRESULT FAR PASCAL InternalBroadcastDriverMessage(UINT hDriverStart,
UINT message,
LPARAM lParam1,
LPARAM lParam2,
UINT flags)
{
LPDRIVERTABLE lpdt;
LRESULT result=0;
int id;
int idEnd;
DrvEnter();
if (!hInstalledDriverList || (int)hDriverStart > cInstalledDrivers) {
DrvLeave();
return(FALSE);
}
if (flags & IBDM_SENDMESSAGE)
{
if (!hDriverStart) {
DrvLeave();
return (FALSE);
}
flags &= ~(IBDM_REVERSE | IBDM_ONEINSTANCEONLY);
idEnd = hDriverStart;
}
else
{
if (flags & IBDM_REVERSE)
{
if (!hDriverStart)
hDriverStart = cInstalledDrivers;
idEnd = -1;
}
else
{
if (!hDriverStart) {
DrvLeave();
return (FALSE);
}
idEnd = cInstalledDrivers;
}
}
hDriverStart--;
lpdt = (LPDRIVERTABLE)GlobalLock(hInstalledDriverList);
for (id = hDriverStart; id != idEnd; ((flags & IBDM_REVERSE) ? id-- : id++))
{
DWORD_PTR dwDriverIdentifier;
DRIVERPROC lpDriverEntryPoint;
if (lpdt[id].hModule)
{
if ((flags & IBDM_ONEINSTANCEONLY) &&
!lpdt[id].fFirstEntry)
continue;
lpDriverEntryPoint = lpdt[id].lpDriverEntryPoint;
dwDriverIdentifier = lpdt[id].dwDriverIdentifier;
/*
* Allow normal messages to overlap - it's up to the
* users not to send messages to stuff that's been unloaded
*/
GlobalUnlock(hInstalledDriverList);
DrvLeave();
result =
(*lpDriverEntryPoint)(dwDriverIdentifier,
(HANDLE)(UINT_PTR)(id+1),
message,
lParam1,
lParam2);
if (flags & IBDM_SENDMESSAGE) {
return result;
}
DrvEnter();
lpdt = (LPDRIVERTABLE)GlobalLock(hInstalledDriverList);
}
}
GlobalUnlock(hInstalledDriverList);
DrvLeave();
return(result);
}
/***************************************************************************
*
* @doc DDK
*
* @api LONG | DrvSendMessage | This function sends a message
* to a specified driver.
*
* @parm HANDLE | hDriver | Specifies the handle of the destination driver.
*
* @parm UINT | wMessage | Specifies a driver message.
*
* @parm LPARAM | lParam1 | Specifies the first message parameter.
*
* @parm LPARAM | lParam2 | Specifies the second message parameter.
*
* @rdesc Returns the results returned from the driver.
*
***************************************************************************/
LRESULT APIENTRY DrvSendMessage(HANDLE hDriver, UINT message, LPARAM lParam1, LPARAM lParam2)
{
if (fUseWinAPI)
return (*lpSendDriverMessage)(hDriver, message, lParam1, lParam2);
return(InternalBroadcastDriverMessage((UINT)(UINT_PTR)hDriver,
message,
lParam1,
lParam2,
IBDM_SENDMESSAGE));
}
/**************************************************************************
*
* @doc DDK
*
* @api LONG | DefDriverProc | This function provides default
* handling of system messages.
*
* @parm DWORD | dwDriverIdentifier | Specifies the identifier of
* the device driver.
*
* @parm HANDLE | hDriver | Specifies the handle of the device driver.
*
* @parm UINT | wMessage | Specifies a driver message.
*
* @parm LPARAM | lParam1 | Specifies the first message parameter.
*
* @parm LPARAM | lParam2 | Specifies the second message parameter.
*
* @rdesc Returns 1L for DRV_LOAD, DRV_FREE, DRV_ENABLE, and DRV_DISABLE.
* It returns 0L for all other messages.
*
***************************************************************************/
LRESULT APIENTRY DefDriverProc(DWORD_PTR dwDriverIdentifier,
HDRVR hDriver,
UINT message,
LPARAM lParam1,
LPARAM lParam2)
{
switch (message)
{
case DRV_LOAD:
case DRV_ENABLE:
case DRV_DISABLE:
case DRV_FREE:
return(1L);
break;
case DRV_INSTALL:
case DRV_REMOVE:
return(DRV_OK);
break;
}
return(0L);
}
/*****************************************************************************
* @doc INTERNAL
*
* @api MMRESULT | DrvIsPreXp | Determines whether the installable driver's
* last modified date is before the approximate Windows XP ship date.
*
* @parm HANDLE | hDriver | Handle to installable driver.
*
* @rdesc BOOL | TRUE if the installable driver's last modified date is before
* the approximate Windows XP ship date.
*
* @comm If there was an error getting file attributes, then let's err on
* the side of an old driver and return TRUE.
*
****************************************************************************/
BOOL DrvIsPreXp(IN HANDLE hDriver)
{
WIN32_FILE_ATTRIBUTE_DATA fad;
HMODULE hModule;
BOOL fPreXp = TRUE;
hModule = DrvGetModuleHandle(hDriver);
if (hModule)
{
TCHAR filename[MAX_PATH];
if (GetModuleFileName(hModule, filename, sizeof(filename)/sizeof(TCHAR)))
{
if (GetFileAttributesEx(filename, GetFileExInfoStandard, &fad))
{
fPreXp = winmmFileTimeIsPreXp(&fad.ftLastWriteTime);
}
else
{
LONG error = GetLastError();
dprintf(("DrvIsPreXp : error: GetFileAttributesEx failed, LastError=%d", error));
}
// dprintf(("DrvIsPreXp : note: %s fPreXp=%d", filename, fPreXp));
}
else
{
LONG error = GetLastError();
dprintf(("DrvIsPreXp : error: GetModuleFileName failed, LastError=%d", error));
}
}
else
{
dprintf(("DrvIsPreXp : error: DrvGetModuleHandle failed"));
}
return fPreXp;
}
MMRESULT mregCreateStringIdFromDriverPort(IN struct _MMDRV *pmmDrv, IN UINT port, OUT PWSTR* pStringId, OUT ULONG* pcbStringId)
{
return StringId_Create(pmmDrv, port, pStringId, pcbStringId);
}
/*****************************************************************************
* @doc INTERNAL WAVE
*
* @api MMRESULT | mregGetIdFromStringId | This function finds the waveOut
* device ID associated with the waveOut device identified by a unique
* string created by waveOutCreateStringIdFromId.
*
* @parm PCWSTR | StringId | Pointer to a unicode string identifying a
* waveOut device.
*
* @parm UINT* | puDeviceID | Address of a buffer to receive the waveOut
* device ID.
*
* @rdesc MMRESULT | Zero if successfull otherwise an error code defined
* in mmsystem.h.
*
* @comm The StringId is normally obtained by calling waveOutCreateStringIdFromId.
*
* @xref waveOutCreateStringIdFromId
*
****************************************************************************/
MMRESULT mregGetIdFromStringId(IN PMMDRV pdrvZ, IN PCWSTR StringId, OUT UINT *puDeviceID)
{
PMMDRV pdrv;
PMMDRV pdrvTarget;
UINT portTarget;
UINT idTarget;
MMRESULT mmr;
if (!ValidateWritePointer(puDeviceID, sizeof(*puDeviceID))) return MMSYSERR_INVALPARAM;
if (!ValidateStringW(StringId, (-1))) return MMSYSERR_INVALPARAM;
EnterNumDevs("mregGetIdFromStringId");
mmr = StringIdDict_Search(StringId, &pdrvTarget, &portTarget);
if (!mmr)
{
idTarget = portTarget;
for (pdrv = pdrvZ->Next; pdrv != pdrvZ; pdrv = pdrv->Next)
{
if (pdrv == pdrvTarget) break;
// Skipping mapper...
if (pdrv->fdwDriver & MMDRV_MAPPER) continue;
idTarget += pdrv->NumDevs;
}
}
LeaveNumDevs("mregGetIdFromStringId");
WinAssert(pdrv != pdrvZ);
*puDeviceID = idTarget;
return mmr;
}
MMRESULT mregQueryStringId(IN PMMDRV pdrv, IN UINT port, OUT WCHAR* pStringIdBuffer, IN ULONG cbStringIdBuffer)
{
PWSTR StringId;
MMRESULT mmr;
mmr = mregCreateStringIdFromDriverPort(pdrv, port, &StringId, NULL);
if (!mmr)
{
if (ValidateWritePointer(pStringIdBuffer, cbStringIdBuffer))
{
int cchStringIdBuffer = cbStringIdBuffer / sizeof(WCHAR);
if (cchStringIdBuffer >= lstrlenW(StringId) + 1)
{
cchStringIdBuffer = lstrlenW(StringId) + 1;
mmr = MMSYSERR_NOERROR;
} else {
mmr = MMSYSERR_MOREDATA;
}
lstrcpynW(pStringIdBuffer, StringId, cchStringIdBuffer);
} else {
mmr = MMSYSERR_INVALPARAM;
}
HeapFree(hHeap, 0, StringId);
}
return mmr;
}
MMRESULT mregQueryStringIdSize(IN PMMDRV pdrv, IN UINT port, OUT ULONG* pcbStringId)
{
PWSTR StringId;
MMRESULT mmr;
if (ValidateWritePointer(pcbStringId, sizeof(*pcbStringId)))
{
mmr = mregCreateStringIdFromDriverPort(pdrv, port, NULL, pcbStringId);
}
else
{
mmr = MMSYSERR_INVALPARAM;
}
return mmr;
}
PMMDRV mregGetDrvListFromClass(DWORD dwClass)
{
PMMDRV pdrvZ;
switch (dwClass)
{
case TYPE_WAVEOUT:
pdrvZ = &waveoutdrvZ;
break;
case TYPE_WAVEIN:
pdrvZ = &waveindrvZ;
break;
case TYPE_MIDIOUT:
pdrvZ = &midioutdrvZ;
break;
case TYPE_MIDIIN:
pdrvZ = &midiindrvZ;
break;
case TYPE_AUX:
pdrvZ = &auxdrvZ;
break;
case TYPE_MIXER:
pdrvZ = &mixerdrvZ;
break;
default:
pdrvZ = NULL;
WinAssert(FALSE);
}
return pdrvZ;
}
/*==========================================================================*/
BOOL FAR PASCAL mregHandleInternalMessages(
PMMDRV pmmdrv,
DWORD dwClass,
UINT idPort,
UINT uMessage,
DWORD_PTR dwParam1,
DWORD_PTR dwParam2,
MMRESULT * pmmr)
{
UINT cbSize;
PMMDRV pmd = (PMMDRV)pmmdrv;
BOOL fResult = TRUE;
MMRESULT mmr = MMSYSERR_NOERROR;
HMODULE hModule;
#ifndef UNICODE
TCHAR szBuff[MAX_PATH];
#endif // End UNICODE
switch (uMessage)
{
case DRVM_MAPPER_PREFERRED_GET:
if (TYPE_WAVEOUT == dwClass) {
if ((pmmdrv->fdwDriver & MMDRV_MAPPER) &&
ValidateWritePointer((PUINT)dwParam1, sizeof(UINT)) &&
ValidateWritePointer((PDWORD)dwParam2, sizeof(DWORD)))
{
waveOutGetCurrentPreferredId((PUINT)dwParam1, (PDWORD)dwParam2);
mmr = MMSYSERR_NOERROR;
} else {
mmr = MMSYSERR_INVALPARAM;
}
} else if (TYPE_WAVEIN == dwClass) {
if ((pmmdrv->fdwDriver & MMDRV_MAPPER) &&
ValidateWritePointer((PUINT)dwParam1, sizeof(UINT)) &&
ValidateWritePointer((PDWORD)dwParam2, sizeof(DWORD)))
{
waveInGetCurrentPreferredId((PUINT)dwParam1, (PDWORD)dwParam2);
mmr = MMSYSERR_NOERROR;
} else {
mmr = MMSYSERR_INVALPARAM;
}
} else if (TYPE_MIDIOUT == dwClass) {
if ((pmmdrv->fdwDriver & MMDRV_MAPPER) &&
ValidateWritePointer((PUINT)dwParam1, sizeof(UINT)) &&
ValidateWritePointer((PDWORD)dwParam2, sizeof(DWORD)))
{
midiOutGetCurrentPreferredId((PUINT)dwParam1, (PDWORD)dwParam2);
mmr = MMSYSERR_NOERROR;
} else {
mmr = MMSYSERR_INVALPARAM;
}
} else {
mmr = MMSYSERR_INVALPARAM;
}
break;
case DRVM_MAPPER_PREFERRED_SET:
if (TYPE_WAVEOUT == dwClass) {
if (pmmdrv->fdwDriver & MMDRV_MAPPER) {
mmr = waveOutSetPersistentPreferredId((UINT)dwParam1, (DWORD)dwParam2);
} else {
mmr = MMSYSERR_INVALPARAM;
}
} else if (TYPE_WAVEIN == dwClass) {
if (pmmdrv->fdwDriver & MMDRV_MAPPER) {
mmr = waveInSetPersistentPreferredId((UINT)dwParam1, (DWORD)dwParam2);
} else {
mmr = MMSYSERR_INVALPARAM;
}
} else if (TYPE_MIDIOUT == dwClass) {
if (pmmdrv->fdwDriver & MMDRV_MAPPER) {
mmr = midiOutSetPersistentPreferredId((UINT)dwParam1, (DWORD)dwParam2);
} else {
mmr = MMSYSERR_INVALPARAM;
}
} else {
mmr = MMSYSERR_INVALPARAM;
}
break;
case DRVM_MAPPER_CONSOLEVOICECOM_GET:
if (TYPE_WAVEOUT == dwClass) {
if ((pmmdrv->fdwDriver & MMDRV_MAPPER) &&
ValidateWritePointer((PUINT)dwParam1, sizeof(UINT)) &&
ValidateWritePointer((PDWORD)dwParam2, sizeof(DWORD)))
{
waveOutGetCurrentConsoleVoiceComId((PUINT)dwParam1, (PDWORD)dwParam2);
mmr = MMSYSERR_NOERROR;
} else {
mmr = MMSYSERR_INVALPARAM;
}
} else if (TYPE_WAVEIN == dwClass) {
if ((pmmdrv->fdwDriver & MMDRV_MAPPER) &&
ValidateWritePointer((PUINT)dwParam1, sizeof(UINT)) &&
ValidateWritePointer((PDWORD)dwParam2, sizeof(DWORD)))
{
waveInGetCurrentConsoleVoiceComId((PUINT)dwParam1, (PDWORD)dwParam2);
mmr = MMSYSERR_NOERROR;
} else {
mmr = MMSYSERR_INVALPARAM;
}
} else {
mmr = MMSYSERR_INVALPARAM;
}
break;
case DRVM_MAPPER_CONSOLEVOICECOM_SET:
if (TYPE_WAVEOUT == dwClass) {
if (pmmdrv->fdwDriver & MMDRV_MAPPER) {
mmr = waveOutSetPersistentConsoleVoiceComId((UINT)dwParam1, (DWORD)dwParam2);
} else {
mmr = MMSYSERR_INVALPARAM;
}
} else if (TYPE_WAVEIN == dwClass) {
if (pmmdrv->fdwDriver & MMDRV_MAPPER) {
mmr = waveInSetPersistentConsoleVoiceComId((UINT)dwParam1, (DWORD)dwParam2);
} else {
mmr = MMSYSERR_INVALPARAM;
}
} else {
mmr = MMSYSERR_INVALPARAM;
}
break;
case DRV_QUERYFILENAME:
// Get Driver's FileName
if ( ((cbSize = (DWORD)dwParam2 * sizeof(WCHAR)) > 0) &&
(ValidateWritePointer( (LPVOID)dwParam1, cbSize)) )
{
lstrncpyW ((LPWSTR)dwParam1,
pmd->wszDrvEntry,
(DWORD)dwParam2-1);
((LPWSTR)dwParam1)[ dwParam2-1 ] = TEXT('\0');
}
else
{
mmr = MMSYSERR_INVALPARAM;
}
break;
case DRV_QUERYDRVENTRY:
case DRV_QUERYNAME:
case DRV_QUERYDEVNODE:
case DRV_QUERYDRIVERIDS:
// Note: Not applicable or obsolete.
mmr = MMSYSERR_NOTSUPPORTED;
break;
case DRV_QUERYDEVICEINTERFACE:
{
// dwParam1 is a pointer to a buffer to contain device interface
// dwParam2 is the length in bytes of the buffer
PWSTR pwstrDeviceInterfaceOut = (PWSTR)dwParam1;
UINT cbDeviceInterfaceOut = (UINT)dwParam2;
PWSTR pwstrDeviceInterface = (PWSTR)pmd->cookie;
int cchDeviceInterfaceOut = cbDeviceInterfaceOut / sizeof(WCHAR);
if (ValidateWritePointer(pwstrDeviceInterfaceOut, cbDeviceInterfaceOut))
{
if (pwstrDeviceInterface)
{
if (cchDeviceInterfaceOut >= lstrlenW(pwstrDeviceInterface) + 1)
{
cchDeviceInterfaceOut = lstrlenW(pwstrDeviceInterface) + 1;
mmr = MMSYSERR_NOERROR;
} else {
mmr = MMSYSERR_MOREDATA;
}
lstrcpynW(pwstrDeviceInterfaceOut, pwstrDeviceInterface, cchDeviceInterfaceOut);
} else {
if (cchDeviceInterfaceOut >= 1)
{
*pwstrDeviceInterfaceOut = '\0';
mmr = MMSYSERR_NOERROR;
} else {
mmr = MMSYSERR_MOREDATA;
}
}
} else {
mmr = MMSYSERR_INVALPARAM;
}
break;
}
case DRV_QUERYDEVICEINTERFACESIZE:
{
// dwParam1 is a pointer to a buffer to contain a ULONG count of bytes
// in the device interface name
PULONG pcbDeviceInterface = (PULONG)dwParam1;
if (ValidateWritePointer(pcbDeviceInterface, sizeof(ULONG)))
{
if (pmd->cookie)
{
*pcbDeviceInterface = (lstrlenW((PWSTR)pmd->cookie) + 1) * sizeof(WCHAR);
} else {
*pcbDeviceInterface = 1 * sizeof(WCHAR);
}
mmr = MMSYSERR_NOERROR;
} else {
mmr = MMSYSERR_INVALPARAM;
}
break;
}
case DRV_QUERYSTRINGID:
{
mmr = mregQueryStringId(pmmdrv, idPort, (WCHAR*)dwParam1, (ULONG)dwParam2);
break;
}
case DRV_QUERYSTRINGIDSIZE:
{
mmr = mregQueryStringIdSize(pmmdrv, idPort, (ULONG*)dwParam1);
break;
}
case DRV_QUERYIDFROMSTRINGID:
{
mmr = mregGetIdFromStringId(mregGetDrvListFromClass(dwClass), (PCWSTR)dwParam1, (UINT*)dwParam2);
break;
}
case DRV_QUERYMAPPABLE:
{
TCHAR szRegKey[MAX_PATH+1];
HKEY hKey;
if (dwParam1 || dwParam2)
return MMSYSERR_INVALPARAM;
#ifdef UNICODE
wsprintfW (szRegKey, TEXT("%s\\%s"), REGSTR_PATH_WAVEMAPPER, pmd->wszDrvEntry);
#else
{
CHAR aszDrvEntry[CHAR_GIVEN_BYTE(sizeof(pmd->wszDrvEntry))+1];
cbSize = sizeof(aszDrvEntry);
UnicodeStrToAsciiStr((LPBYTE)aszDrvEntry, (LPBYTE)aszDrvEntry + cbSize,
pmd->wszDrvEntry);
wsprintfA (szRegKey, TEXT("%s\\%s"), REGSTR_PATH_WAVEMAPPER, aszDrvEntry);
}
#endif
if (RegOpenKey (HKEY_LOCAL_MACHINE, szRegKey, &hKey) != ERROR_SUCCESS)
{
mmr = MMSYSERR_NOERROR;
}
else
{
DWORD dwMappable;
DWORD dwSize;
DWORD dwType;
dwSize = sizeof(dwMappable);
if (RegQueryValueEx (hKey,
REGSTR_VALUE_MAPPABLE,
NULL,
&dwType,
(void *)&dwMappable,
&dwSize) != ERROR_SUCCESS)
{
dwMappable = 1;
}
RegCloseKey (hKey);
mmr = (dwMappable) ? MMSYSERR_NOERROR :
MMSYSERR_NOTSUPPORTED;
}
}
break;
case DRV_QUERYMAPID:
WinAssert(DRV_QUERYMAPID != uMessage);
mmr = MMSYSERR_NOTSUPPORTED;
break;
case DRV_QUERYNUMPORTS:
if (ValidateWritePointer( (LPVOID)dwParam1, sizeof(DWORD)))
{
*((LPDWORD)dwParam1) = pmd->NumDevs;
}
else
{
mmr = MMSYSERR_INVALPARAM;
}
break;
case DRV_QUERYMODULE:
if (ValidateWritePointer( (LPVOID)dwParam1, sizeof(DWORD)))
{
hModule = DrvGetModuleHandle(pmd->hDriver);
*((HMODULE *)dwParam1) = hModule;
}
else
{
mmr = MMSYSERR_INVALPARAM;
}
break;
default:
// Not an internal message
fResult = FALSE;
break;
}
if (pmmr)
*pmmr = mmr;
return fResult;
} // End mregHandleInternalMessage
/*==========================================================================*/
/*
@doc INTERNAL MMSYSTEM
@func <t UINT> | mregRemoveDriver |
Sends exit message to the driver message entry, and closes the
installable driver. Then releases resources referenced by the MMDRV
structure. Finally removes the MMDRV structure from its list and
frees it.
@parm <t PMMDRV> | pdrv |
Pointer to the MMDRV node associated with the driver
@rdesc No return value
@comm This function assumes the list containing pdrv is locked.
@xref mregDecUsage
*/
void mregRemoveDriver(PMMDRV pdrv)
{
WinAssert(pdrv->cookie);
WinAssert(pdrv->drvMessage);
WinAssert(pdrv->hDriver);
StringIdDict_Remove(pdrv);
pdrv->drvMessage(0, DRVM_EXIT, 0L, 0L, (DWORD_PTR)pdrv->cookie);
DrvClose(pdrv->hDriver, 0, 0);
pdrv->Prev->Next = pdrv->Next;
pdrv->Next->Prev = pdrv->Prev;
DeleteCriticalSection(&pdrv->MixerCritSec);
wdmDevInterfaceDec(pdrv->cookie);
ZeroMemory(pdrv, sizeof(*pdrv));
HeapFree(hHeap, 0, pdrv);
return;
}
void mregAddDriver(PMMDRV pdrvZ, PMMDRV pdrv)
{
pdrv->Prev = pdrvZ->Prev;
pdrv->Next = pdrvZ;
pdrv->Prev->Next = pdrv;
pdrv->Next->Prev = pdrv;
StringIdDict_Insert(pdrv);
}
/*==========================================================================*/
/*
@doc INTERNAL MMSYSTEM
@func <t UINT> | mregIncUsage |
Increments the usage count of the specified media resource. If the
usage count is non-zero, the media resource cannot be unloaded. The
usage count is increased when instances of the media resource are
opened, such as with a <f waveOutOpen> call.
@parm <t HMD> | hmd |
Contains the media resource handle to increment.
@rdesc Returns the current usage count.
@xref mregDecUsage, mregQueryUsage
*/
UINT FAR PASCAL mregIncUsagePtr(
PMMDRV pmd
)
{
return InterlockedIncrement(&pmd->Usage);
}
UINT FAR PASCAL mregIncUsage(
HMD hmd
)
{
return mregIncUsagePtr(HtoPT(PMMDRV, hmd));
}
/*==========================================================================*/
/*
@doc INTERNAL MMSYSTEM
@func <t UINT> | mregDecUsage |
Decrements the usage count of the specified media resource. If the
usage count is zero, the media resource can be unloaded. The usage
count is decresed when instance of the media resource are closed, such
as with a <f waveOutClose> call.
@parm <t PMMDRV> | pdrv |
Pointer to the media resource to decrement.
@rdesc Returns the current usage count.
@comm Unless the caller has other usages on the pdrv, it must not use
it after this call returns.
@xref mregIncUsage, mregQueryUsage
*/
UINT FAR PASCAL mregDecUsagePtr(
PMMDRV pdrv
)
{
UINT refcount;
EnterNumDevs("mregDecUsage");
refcount = InterlockedDecrement(&pdrv->Usage);
if (0 == refcount)
{
WinAssert(pdrv->fdwDriver & MMDRV_DESERTED);
mregRemoveDriver(pdrv);
}
LeaveNumDevs("mregDecUsage");
return refcount;
}
UINT FAR PASCAL mregDecUsage(
HMD hmd
)
{
return mregDecUsagePtr(HtoPT(PMMDRV, hmd));
}
/*==========================================================================*/
/*
@doc INTERNAL MMSYSTEM
@func <t MMRESULT> | mregFindDevice |
Given a Device Identifier of a specific Resource Class, returns the
corresponding Resource handle and port. This can then be used to
communicate with the driver. The resource handle is referenced
(i.e., its usage is incremented). The caller is responsible for
ensureing it is eventually released by calling mregDecUsage.
@parm <t UINT> | uDeviceID |
Contains the Device Identifier whose handle and port is to be returned.
If this contains -1, then it is assumed that a mapper of the specified
class is being sought. These identifiers correspond to the <lq>Device
IDs<rq> used with various functions such as <f waveOutOpen>. This
enables the various components to search for internal media resource
handles based on Device IDs passed to public APIs.
@parm <t WORD> | fwFindDevice |
Contains the flags specifying the class of device.
@flag <cl MMDRVI_WAVEIN> | Wave Input device.
@flag <cl MMDRVI_WAVEOUT> | Wave Output device.
@flag <cl MMDRVI_MIDIIN> | MIDI Input device.
@flag <cl MMDRVI_MIDIOUT> | MIDI Output device.
@flag <cl MMDRVI_AUX> | Aux device.
@flag <cl MMDRVI_MIXER> | Mixer device.
@flag <cl MMDRVI_JOY> | Joystick device.
@flag <cl MMDRVI_MAPPER> | Mapper device of the specified class. This is used
in addition to any of the above resource classes in order to specify
that the class mapper is to be returned. If this is not specified, the
mapper is not returned as a match to a query.
@parm <t HMD> <c FAR>* | phmd |
Points to a buffer in which to place the Media Resource Handle.
@parm <t UINT> <c FAR>* | puDevicePort |
Points to a buffer in which to place the Device Port. This is used as
a parameter when sending messages to the device to specify which port.
@rdesc Returns <cl MMSYSERR_BADDEVICEID> if the specified Device Identifier was
out of range, else <cl MMSYSERR_NOERROR> on success.
@xref mregEnumDevice, mregGetNumDevs, mregDecUsage
*/
MMRESULT FAR PASCAL mregFindDevice(
UINT uDeviceID,
WORD fwFindDevice,
HMD FAR* phmd,
UINT FAR* puDevicePort)
{
PMMDRV pmd;
UINT port;
MMRESULT mmr;
WinAssert((TYPE_MIDIOUT == (fwFindDevice & MMDRVI_TYPE)) || (TYPE_MIDIIN == (fwFindDevice & MMDRVI_TYPE)));
switch (fwFindDevice & MMDRVI_TYPE)
{
case TYPE_MIDIOUT:
mmr = midiReferenceDriverById(&midioutdrvZ, uDeviceID, &pmd, &port);
break;
case TYPE_MIDIIN:
mmr = midiReferenceDriverById(&midiindrvZ, uDeviceID, &pmd, &port);
break;
default:
return MMSYSERR_BADDEVICEID;
}
if (!mmr)
{
WinAssert(pmd);
*phmd = PTtoH(HMD, pmd);
*puDevicePort = port;
}
return mmr;
}