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windows-xp/Source/XPSP1/NT/base/mvdm/wow16/mmsystem/mciparse.c

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/*******************************Module*Header*********************************\
* Module Name: mciparse.c
*
* Media Control Architecture Command Parser
*
* Created: 3/2/90
* Author: DLL (DavidLe)
*
* History:
*
* Copyright (c) 1990 Microsoft Corporation
*
\******************************************************************************/
#include <windows.h>
#define MMNOMIDI
#define MMNOWAVE
#define MMNOSOUND
#define MMNOTIMER
#define MMNOJOY
#define MMNOSEQ
#include "mmsystem.h"
#define NOMIDIDEV
#define NOWAVEDEV
#define NOTIMERDEV
#define NOJOYDEV
#define NOSEQDEV
#define NOTASKDEV
#include "mmddk.h"
#include "mmsysi.h"
#ifndef STATICFN
#define STATICFN
#endif
#define WCODE UINT _based(_segname("_CODE"))
extern char far szOpen[]; // in MCI.C
#ifdef DEBUG_RETAIL
extern int DebugmciSendCommand;
#endif
// Number of command tables registered, including "holes"
static UINT number_of_command_tables;
// Command table list
command_table_type command_tables[MAX_COMMAND_TABLES];
static SZCODE szTypeTableExtension[] = ".mci";
static SZCODE szCoreTable[] = "core";
// Core table is loaded when the first MCI command table is requested
static BOOL bCoreTableLoaded;
// One element for each device type. Value is the table type to use
// or 0 if there is no device type specific table.
static WCODE table_types[] =
{
MCI_DEVTYPE_VCR, // vcr
MCI_DEVTYPE_VIDEODISC, // videodisc
MCI_DEVTYPE_OVERLAY, // overlay
MCI_DEVTYPE_CD_AUDIO, // cdaudio
MCI_DEVTYPE_DAT, // dat
MCI_DEVTYPE_SCANNER, // scanner
MCI_DEVTYPE_ANIMATION, // animation
MCI_DEVTYPE_DIGITAL_VIDEO, // digitalvideo
MCI_DEVTYPE_OTHER, // other
MCI_DEVTYPE_WAVEFORM_AUDIO, // waveaudio
MCI_DEVTYPE_SEQUENCER // sequencer
};
/*!!
void PASCAL NEAR mciToLower (LPSTR lpstrString)
{
while (*lpstrString != '\0')
{
if (*lpstrString >= 'A' && *lpstrString <= 'Z')
*lpstrString += 0x20;
++lpstrString;
}
}
*/
/*
* @doc INTERNAL MCI
* @func UINT | mciEatCommandEntry | Read a command resource entry and
* return its length and its value and identifier
*
* @parm LPCSTR | lpEntry | The start of the command resource entry
*
* @parm LPDWORD | lpValue | The value of the entry, returned to caller
* May be NULL
*
* @parm UINT FAR* | lpID | The identifier of the entry, returned to caller
* May be NULL
*
* @rdesc The total number of bytes in the entry
*
*/
UINT PASCAL NEAR mciEatCommandEntry (
LPCSTR lpEntry,
LPDWORD lpValue,
UINT FAR* lpID)
{
LPCSTR lpScan = lpEntry;
while (*lpScan++ != '\0')
;
if (lpValue != NULL)
*lpValue = *(LPDWORD)lpScan;
lpScan += sizeof(DWORD);
if (lpID != NULL)
*lpID = *(LPWORD)lpScan;
lpScan += sizeof(UINT);
return lpScan - lpEntry;
}
// Return the size used by this token in the parameter list
UINT PASCAL NEAR mciGetParamSize (DWORD dwValue, UINT wID)
{
switch (wID)
{
case MCI_CONSTANT:
case MCI_INTEGER:
case MCI_STRING:
return sizeof(DWORD);
case MCI_RECT:
return sizeof(RECT);
case MCI_RETURN:
switch ((UINT)dwValue)
{
case MCI_INTEGER:
return sizeof(DWORD);
case MCI_STRING:
case MCI_RECT:
return sizeof(RECT);
default:
DOUT ("mciGetParamSize: Unknown return type\r\n");
return 0;
}
break;
}
return 0;
}
/*
* @doc INTERNAL MCI
* @func UINT | mciRegisterCommandTable | This function adds a new
* table for the MCI parser.
*
* @parm HGLOBAL | hResource | Handle to the RCDATA resource
*
* @parm UINT FAR* | lpwIndex | Pointer to command table index
*
* @parm UINT | wType | Specifies the device type for this command table.
* Driver tables and the core table are type 0.
*
* @parm HINSTANCE | hModule | Module instance registering table.
*
* @rdesc Returns the command table index number that was assigned or -1
* on error.
*
*/
STATICFN UINT PASCAL NEAR
mciRegisterCommandTable(
HGLOBAL hResource,
UINT FAR* lpwIndex,
UINT wType,
HINSTANCE hModule
)
{
UINT wID;
/* First check for free slots */
for (wID = 0; wID < number_of_command_tables; ++wID)
if (command_tables[wID].hResource == NULL)
break;
/* If no empty slots then allocate another one */
if (wID >= number_of_command_tables)
{
if (number_of_command_tables == MAX_COMMAND_TABLES)
{
DOUT ("mciRegisterCommandTable: No more tables\r\n");
return (UINT)-1;
}
else
wID = number_of_command_tables++;
}
/* Fill in the slot */
command_tables[wID].wType = wType;
command_tables[wID].hResource = hResource;
command_tables[wID].lpwIndex = lpwIndex;
command_tables[wID].hModule = hModule;
#ifdef DEBUG
command_tables[wID].wLockCount = 0;
#endif
#ifdef DEBUG
if (DebugmciSendCommand > 2)
{
DPRINTF(("mciRegisterCommandTable INFO: assigned slot %u\r\n", wID));
DPRINTF(("mciRegisterCommandTable INFO: #tables is %u\r\n",
number_of_command_tables));
}
#endif
return wID;
}
/*
* @doc DDK MCI
* @api UINT | mciLoadCommandResource | Registers the indicated
* resource as an MCI command table and builds a command table
* index. If a file with the resource name and the extension '.mci' is
* found in the path then the resource is taken from that file.
*
* @parm HINSTANCE | hInstance | The instance of the module whose executable
* file contains the resource. This parameter is ignored if an external file
* is found.
*
* @parm LPCSTR | lpResName | The name of the resource
*
* @parm UINT | wType | The table type. Custom device specific tables MUST
* give a table type of 0.
*
* @rdesc Returns the command table index number that was assigned or -1
* on error.
*
*/
UINT WINAPI mciLoadCommandResource (
HINSTANCE hInstance,
LPCSTR lpResName,
UINT wType)
{
UINT FAR* lpwIndex, FAR* lpwScan;
HINSTANCE hExternal;
HRSRC hResInfo;
HGLOBAL hResource;
LPSTR lpResource, lpScan;
int nCommands = 0;
UINT wID;
UINT wLen;
// Name + '.' + Extension + '\0'
char strFile[8 + 1 + 3 + 1];
LPSTR lpstrFile = strFile;
LPCSTR lpstrType = lpResName;
OFSTRUCT ofs;
#ifdef DEBUG
if (DebugmciSendCommand > 2)
DPRINTF(("mciLoadCommandResource INFO: %s loading\r\n", (LPSTR)lpResName));
#endif
// Initialize the device list
if (!MCI_bDeviceListInitialized && !mciInitDeviceList())
return MCIERR_OUT_OF_MEMORY;
// Load the core table if its not already there
if (!bCoreTableLoaded)
{
bCoreTableLoaded = TRUE;
// If its not the core table being loaded
if (lstrcmpi (szCoreTable, lpResName) != 0)
if (mciLoadCommandResource (ghInst, szCoreTable, 0) == -1)
{
DOUT ("mciLoadCommandResource: Cannot load core table\r\n");
}
}
// Check for a file with the extension ".mci"
// Copy up to the first eight characters of device type
while (lpstrType < lpResName + 8 && *lpstrType != '\0')
*lpstrFile++ = *lpstrType++;
// Tack extension onto end
lstrcpy (lpstrFile, szTypeTableExtension);
// If the file exists and can be loaded then set flag
// otherwise load resource from MMSYSTEM.DLL
if (OpenFile (strFile, &ofs, OF_EXIST) == HFILE_ERROR ||
(hExternal = LoadLibrary(strFile)) < HINSTANCE_ERROR)
hExternal = NULL;
// Load the given table from the file or from the module if not found
if (hExternal != NULL &&
(hResInfo = FindResource (hExternal, lpResName, RT_RCDATA)) != NULL)
hInstance = hExternal;
else
hResInfo = FindResource (hInstance, lpResName, RT_RCDATA);
if (hResInfo == NULL)
{
DOUT ("mciLoadCommandResource: Cannot find command resource\r\n");
return (UINT)-1;
}
if ((hResource = LoadResource (hInstance, hResInfo)) == NULL)
{
DOUT ("mciLoadCommandResource: Cannot load command resource\r\n");
return (UINT)-1;
}
if ((lpResource = LockResource (hResource)) == NULL)
{
DOUT ("mciLoadCommandResource: Cannot lock resource\r\n");
FreeResource (hResource);
return (UINT)-1;
}
/* Count the number of commands */
lpScan = lpResource;
while (TRUE)
{
lpScan += mciEatCommandEntry(lpScan, NULL, &wID);
// End of command?
if (wID == MCI_COMMAND_HEAD)
++nCommands;
// End of command list?
else if (wID == MCI_END_COMMAND_LIST)
break;
}
// There must be at least on command in the table
if (nCommands == 0)
{
DOUT ("mciLoadCommandResource: No commands in the specified table\r\n");
UnlockResource (hResource);
FreeResource (hResource);
return (UINT)-1;
}
// Allocate storage for the command table index
// Leave room for a -1 entry to terminate it
if ((lpwIndex = (UINT FAR*)
mciAlloc ((UINT)sizeof (UINT) * (nCommands + 1)))
== NULL)
{
DOUT ("mciLoadCommandResource: cannot allocate command table index\r\n");
UnlockResource (hResource);
FreeResource (hResource);
return (UINT)-1;
}
/* Build Command Table */
lpwScan = lpwIndex;
lpScan = lpResource;
while (TRUE)
{
// Get next command entry
wLen = mciEatCommandEntry (lpScan, NULL, &wID);
if (wID == MCI_COMMAND_HEAD)
// Add an index to this command
*lpwScan++ = lpScan - lpResource;
else if (wID == MCI_END_COMMAND_LIST)
{
// Mark the end of the table
*lpwScan = (UINT)-1;
break;
}
lpScan += wLen;
}
UnlockResource (hResource);
return mciRegisterCommandTable (hResource, lpwIndex, wType, hExternal);
}
/*
* @doc INTERNAL MCI
* @func UINT | mciLoadTableType | If the table of the given type
* has not been loaded, register it
*
* @parm UINT | wType | The table type to load
*
* @rdesc Returns the command table index number that was assigned or -1
* on error.
*/
UINT PASCAL NEAR mciLoadTableType (
UINT wType)
{
UINT wID;
char buf[MCI_MAX_DEVICE_TYPE_LENGTH];
int nTypeLen;
// Check to see if this table type is already loaded
for (wID = 0; wID < number_of_command_tables; ++wID)
if (command_tables[wID].wType == wType)
return wID;
// Must load table
// First look up what device type specific table to load for this type
if (wType < MCI_DEVTYPE_FIRST || wType > MCI_DEVTYPE_LAST)
return (UINT)-1;
// Load string that corresponds to table type
LoadString (ghInst, table_types[wType - MCI_DEVTYPE_FIRST],
buf, sizeof(buf));
//Must be at least one character in type name
if ((nTypeLen = lstrlen (buf)) < 1)
return (UINT)-1;
// Register the table with MCI
return mciLoadCommandResource (ghInst, buf, wType);
}
/*
* @doc DDK MCI
*
* @api BOOL | mciFreeCommandResource | Frees the memory used
* by the specified command table.
*
* @parm UINT | wTable | The table index returned from a previous call to
* mciLoadCommandResource.
*
* @rdesc FALSE if the table index is not valid, TRUE otherwise.
*
*/
BOOL WINAPI mciFreeCommandResource (
UINT wTable)
{
UINT wID;
HGLOBAL hResource;
UINT FAR* lpwIndex;
#ifdef DEBUG
if (DebugmciSendCommand > 2)
{
DPRINTF(("mciFreeCommandResource INFO: Free table %d\r\n", wTable));
DPRINTF(("mciFreeCommandResource INFO: Lockcount is %d\r\n",
command_tables[wTable].wLockCount));
}
#endif
/* Validate input -- do not let the core table be free'd */
if (wTable <= 0 || wTable >= number_of_command_tables)
{
#ifdef DEBUG
// wTable == -1 is OK
if (wTable != -1)
DOUT ("mciFreeCommandResource: Bad table number\r\n");
#endif
return FALSE;
}
// If this table is being used elsewhere then keep it around
for (wID = 1; wID < MCI_wNextDeviceID; ++wID)
if (MCI_lpDeviceList[wID] != NULL)
if (MCI_lpDeviceList[wID]->wCustomCommandTable == wTable ||
MCI_lpDeviceList[wID]->wCommandTable == wTable)
{
#ifdef DEBUG
if (DebugmciSendCommand > 2)
DOUT ("mciFreeCommandResource INFO: table in use\r\n");
#endif
return FALSE;
}
#if 0
/* Search the list of tables */
for (wID = 0; wID < number_of_command_tables; ++wID)
/* If this resource is still in use, keep it around */
if (command_tables[wID].hResource == hResource)
{
#ifdef DEBUG
if (DebugmciSendCommand > 2)
DOUT ("mciFreeCommandResource INFO: resource in use\r\n");
#endif
return FALSE;
}
#endif
hResource = command_tables[wTable].hResource;
command_tables[wTable].hResource = NULL;
lpwIndex = command_tables[wTable].lpwIndex;
command_tables[wTable].lpwIndex = NULL;
command_tables[wTable].wType = 0;
FreeResource (hResource);
mciFree (lpwIndex);
if (command_tables[wTable].hModule != NULL)
FreeLibrary (command_tables[wTable].hModule);
// Make space at top of list
if (wTable == number_of_command_tables - 1)
--number_of_command_tables;
#ifdef DEBUG
if (DebugmciSendCommand > 2)
DPRINTF(("mciFreeCommandResource INFO: number_of_command_tables: %u\r\n",
number_of_command_tables));
#endif
return TRUE;
}
#ifdef DEBUG
void PASCAL NEAR mciCheckLocks (void)
{
UINT wTable;
if (DebugmciSendCommand <= 2)
return;
for (wTable = 0; wTable < number_of_command_tables; ++wTable)
{
if (command_tables[wTable].hResource == NULL)
continue;
DPRINTF(("mciCheckLocks INFO: table %u ", wTable));
DPRINTF(("user: %x ",
GlobalFlags (command_tables[wTable].hResource) & GMEM_LOCKCOUNT));
DPRINTF(("mci: %u ", command_tables[wTable].wLockCount));
if (GlobalFlags (command_tables[wTable].hResource) & GMEM_DISCARDABLE)
DPRINTF(("discardable\r\n"));
else
DPRINTF(("NOT discardable\r\n"));
}
}
#endif
/*
* @doc INTERNAL MCI
* @func BOOL | mciUnlockCommandTable | Unlocks the command table given by
* a table index
*
* @parm UINT | wCommandTable | Table to unlock
*
* @rdesc TRUE if success, FALSE otherwise
*
* @comm Used external to this module by mci.c
*
*/
BOOL PASCAL NEAR mciUnlockCommandTable (
UINT wCommandTable)
{
UnlockResource(command_tables[wCommandTable].hResource);
#ifdef DEBUG
--command_tables[wCommandTable].wLockCount;
if (DebugmciSendCommand > 2)
{
DPRINTF(("mciUnlockCommandTable INFO: table %d\r\n", wCommandTable));
DOUT ("mciUnlockCommandTable INFO: check locks...\r\n");
mciCheckLocks();
}
#endif
return TRUE;
}
/*
* @doc INTERNAL MCI
* @func LPSTR | FindCommandInTable | Look up the given
* command string in the GIVEN parser command table
*
* @parm UINT | wTable | Command table to use
*
* @parm LPCSTR | lpstrCommand | The command to look up. It must
* be in lower case with no leading or trailing blanks and with at
* least one character.
*
* @parm UINT FAR * | lpwMessage | The message corresponding to the command
* Returned to caller.
*
* @rdesc NULL if the command is unknown or on error, otherwise a pointer to
* the command list for the input command string.
*
* @comm If the command is found, the command resource will be locked on exit.
*
*/
LPSTR PASCAL NEAR FindCommandInTable (
UINT wTable,
LPCSTR lpstrCommand,
UINT FAR * lpwMessage)
{
UINT FAR* lpwIndex;
LPSTR lpResource, lpstrThisCommand;
UINT wMessage;
/* Validate table */
if (wTable >= number_of_command_tables)
{
// Check the core table but its not yet loaded
if (wTable == 0)
{
// Try to load it
if (mciLoadCommandResource (ghInst, szCoreTable, 0) == -1)
{
DOUT ("FindCommandInTable: cannot load core table\r\n");
return NULL;
}
} else
{
DOUT ("MCI FindCommandInTable: invalid table ID\r\n");
return NULL;
}
}
if ((lpResource = LockResource (command_tables[wTable].hResource)) == NULL)
{
DOUT ("MCI FindCommandInTable: Cannot lock table resource\r\n");
return NULL;
}
#ifdef DEBUG
++command_tables[wTable].wLockCount;
#endif
// Look at each command in the table
lpwIndex = command_tables[wTable].lpwIndex;
if (lpwIndex == NULL)
{
DOUT ("MCI FindCommandInTable: null command table index\r\n");
return NULL;
}
while (*lpwIndex != -1)
{
DWORD dwMessage;
lpstrThisCommand = *lpwIndex++ + lpResource;
// Get message number from the table
mciEatCommandEntry (lpstrThisCommand, &dwMessage, NULL);
wMessage = (UINT)dwMessage;
// Does this command match the input?
// String case
if (HIWORD (lpstrCommand) != 0 &&
lstrcmpi (lpstrThisCommand, lpstrCommand) == 0 ||
// Message case
HIWORD (lpstrCommand) == 0 &&
wMessage == LOWORD ((DWORD)lpstrCommand))
{
// Retain the locked resource pointer
command_tables[wTable].lpResource = lpResource;
// Address the message ID which comes after the command name
if (lpwMessage != NULL)
*lpwMessage = wMessage;
// Leave table locked on exit
return lpstrThisCommand;
}
// Strings don't match, go to the next command in the table
}
UnlockResource (command_tables[wTable].hResource);
#ifdef DEBUG
--command_tables[wTable].wLockCount;
#endif
return NULL;
}
/*
* @doc INTERNAL MCI
* @func LPSTR | FindCommandItem | Look up the given
* command string in the parser command tables
*
* @parm UINT | wDeviceID | The device ID used for this command.
* If 0 then only the system core command table is searched.
*
* @parm LPCSTR | lpstrType | The type name of the device
*
* @parm LPCSTR | lpstrCommand | The command to look up. It must
* be in lower case with no leading or trailing blanks and with at
* least one character. If the HIWORD is 0 then the LOWORD contains
* the command message ID instead of a command name and the function is
* merely to find the command list pointer.
*
* If the high word is 0 then the low word is an command ID value instead
* of a command name
*
* @parm UINT FAR* | lpwMessage | The message corresponding to the command
* Returned to caller.
*
* @parm UINT FAR* | lpwTable | The table index in which the command was found
* Returned to caller.
*
* @rdesc NULL if the command is unknown, otherwise a pointer to
* the command list for the input command string.
*/
LPSTR PASCAL NEAR FindCommandItem (
UINT wDeviceID,
LPCSTR lpstrType,
LPCSTR lpstrCommand,
UINT FAR* lpwMessage,
UINT FAR* lpwTable)
{
LPSTR lpCommand;
UINT wTable;
LPMCI_DEVICE_NODE nodeWorking;
// Only check hiword per comments above
if (HIWORD (lpstrCommand) != NULL && *lpstrCommand == '\0')
{
DOUT ("MCI FindCommandItem: lpstrCommand is NULL or empty string\r\n");
return NULL;
}
// If a specific device ID was specified then look in any custom table
// or type table
if (wDeviceID != 0 && wDeviceID != MCI_ALL_DEVICE_ID)
{
// If the device ID is valid
if (!MCI_VALID_DEVICE_ID(wDeviceID))
{
DOUT ("MCI FindCommandItem: Invalid device ID\r\n");
return NULL;
}
nodeWorking = MCI_lpDeviceList[wDeviceID];
// If there is a custom command table then use it
if ((wTable = nodeWorking->wCustomCommandTable) != -1)
{
lpCommand = FindCommandInTable (wTable, lpstrCommand, lpwMessage);
if (lpCommand != NULL)
goto exit;
}
// Get the device type table from the existing device
// Relies on mciReparseCommand in mciLoadDevice to catch all device type
// tables when device is not yet open.
if ((wTable = nodeWorking->wCommandTable) != -1)
{
lpCommand = FindCommandInTable (wTable, lpstrCommand, lpwMessage);
if (lpCommand != NULL)
goto exit;
}
}
// If no match was found in the device or type specific tables
// Look in the core table
wTable = 0;
lpCommand = FindCommandInTable (wTable, lpstrCommand, lpwMessage);
if (lpCommand == NULL)
wTable = (UINT)-1;
exit:
if (lpwTable != NULL)
*lpwTable = wTable;
#ifdef DEBUG
if (DebugmciSendCommand > 2)
{
DOUT ("FindCommandItem INFO: check locks...\r\n");
mciCheckLocks();
}
#endif
return lpCommand;
}
/*
* @doc INTERNAL MCI
* @func LPSTR | mciCheckToken | Check to see if the command item matches
* the given string, allowing multiple blanks in the input parameter to
* match a corresponding single blank in the command token and ignoring
* case.
*
* @parm LPCSTR | lpstrToken | The command token to check
*
* @parm LPCSTR | lpstrParam | The input parameter
*
* @rdesc NULL if no match, otherwise points to the first character
* after the parameter
*
*/
STATICFN LPSTR PASCAL NEAR
mciCheckToken(
LPCSTR lpstrToken,
LPCSTR lpstrParam
)
{
/* Check for legal input */
if (lpstrToken == NULL || lpstrParam == NULL)
return NULL;
while (*lpstrToken != '\0' && MCI_TOLOWER(*lpstrParam) == *lpstrToken)
{
// If the token contains a blank, allow more than one blank in the
// parameter
if (*lpstrToken == ' ')
while (*lpstrParam == ' ')
++lpstrParam;
else
*lpstrParam++;
*lpstrToken++;
}
if (*lpstrToken != '\0'|| (*lpstrParam != '\0' && *lpstrParam != ' '))
return NULL;
else
return (LPSTR)lpstrParam;
}
/*
* @doc INTERNAL MCI
* @api BOOL | mciParseInteger | Parse the given integer
*
* @parm LPSTR FAR * | lplpstrInput | The string containing the argument.
* It is updated and returned to the caller pointing to the first character
* after the argument or to the first character that is in error.
*
* @parm LPDWORD | lpdwArgument | The place to put the output
*
* @rdesc Returns TRUE if not error
*
* @comm If there are colons in the input (':') the result is "colonized".
* This means that each time a colon is read, the current result is written
* and any subsequent digits are shifted left one byte. No one "segment"
* can be more than 0xFF. For example, "0:1:2:3" is parsed to 0x03020100.
*
*/
#pragma warning(4:4146)
STATICFN BOOL PASCAL NEAR
mciParseInteger(
LPSTR FAR * lplpstrInput,
LPDWORD lpdwArgument
)
{
LPSTR lpstrInput = *lplpstrInput;
BOOL fDigitFound;
DWORD dwResult;
LPSTR lpstrResult = (LPSTR)lpdwArgument;
int nDigitPosition = 0;
BOOL bSigned = FALSE;
// Leading blanks have been removed by mciParseParams
if (*lpstrInput == '-')
{
++lpstrInput;
bSigned = TRUE;
}
// Read digits
*lpdwArgument = 0; /* Initialize */
dwResult = 0;
fDigitFound = FALSE; /* Initialize */
while (*lpstrInput >= '0' && *lpstrInput <= '9' || *lpstrInput == ':')
{
// ':' indicates colonized data
if (*lpstrInput == ':')
{
// Cannot mix colonized and signed forms
if (bSigned)
{
DOUT ("Bad integer: mixing signed and colonized forms\r\n");
return FALSE;
}
// Check for overflow in accumulated colonized byte
if (dwResult > 0xFF)
return FALSE;
// Copy and move to next byte converted in output
*lpstrResult++ = (char)dwResult;
++lpstrInput;
// Initialize next colonized byte
dwResult = 0;
++nDigitPosition;
// Only allow four colonized components
if (nDigitPosition > 3)
{
DOUT ("Bad integer: Too many colonized components\r\n");
return FALSE;
}
} else
{
char cDigit = (char)(*lpstrInput++ - '0');
// Satisfies condition that at least one digit must be read
fDigitFound = TRUE;
if (dwResult > 0xFFFFFFFF / 10)
// Overflow if multiply was to occur
return FALSE;
else
// Multiply for next digit
dwResult *= 10;
// Add new digit
dwResult += cDigit;
}
}
if (nDigitPosition == 0)
{
// No colonized components
if (bSigned)
{
// Check for overflow from negation
if (dwResult > 0x7FFFFFFF)
return FALSE;
// Negate result because a '-' sign was parsed
dwResult = -dwResult;
}
*lpdwArgument = dwResult;
}
else
// Store last colonized component
{
// Check for overflow
if (dwResult > 0xFF)
return FALSE;
// Store component
*lpstrResult = (char)dwResult;
}
*lplpstrInput = lpstrInput;
/*
If there were no digits or if the digits were followed by a character
other than a blank or a '\0', then return a syntax error.
*/
return fDigitFound && (!*lpstrInput || *lpstrInput == ' ');
}
/*
* @doc INTERNAL MCI
* @func BOOL | mciParseConstant | Parse the given integer
*
* @parm LPSTR FAR * | lplpstrInput | The string containing the argument.
* It is updated and returned to the caller pointing to the first character
* after the argument or to the first character that is in error.
*
* @parm LPDWORD | lpdwArgument | The place to put the output
*
* @parm LPSTR | lpItem | Pointer into command table.
*
* @rdesc Returns TRUE if not error
*
*/
STATICFN BOOL PASCAL NEAR
mciParseConstant(
LPSTR FAR * lplpstrInput,
LPDWORD lpdwArgument,
LPSTR lpItem
)
{
LPSTR lpPrev;
DWORD dwValue;
UINT wID;
// Skip past constant header
lpItem += mciEatCommandEntry (lpItem, &dwValue, &wID);
while (TRUE)
{
LPSTR lpstrAfter;
lpPrev = lpItem;
lpItem += mciEatCommandEntry (lpItem, &dwValue, &wID);
if (wID == MCI_END_CONSTANT)
break;
if ((lpstrAfter = mciCheckToken (lpPrev, *lplpstrInput)) != NULL)
{
*lpdwArgument = dwValue;
*lplpstrInput = lpstrAfter;
return TRUE;
}
}
return mciParseInteger (lplpstrInput, lpdwArgument);
}
/*
* @doc INTERNAL MCI
* @func UINT | mciParseArgument | Parse the given argument
*
* @parm DWORD | dwValue | The argument value
*
* @parm UINT | wID | The argument ID
*
* @parm LPSTR FAR * | lplpstrOutput | The string containing the argument.
* It is updated and returned to the caller pointing to the first character
* after the argument or to the first character that is in error.
*
* @parm LPDWORD | lpdwFlags | The output flags
*
* @parm LPDWORD | lpArgument | The place to put the output
*
* @rdesc Returns 0 if no error or
* @flag MCIERR_BAD_INTEGER | An integer argument could not be parsed
* @flag MCIERR_MISSING_STRING_ARGUMENT | An expected string argument
* @flag MCIERR_PARM_OVERFLOW | The output buffer was a NULL pointer
* was missing
*
*/
STATICFN UINT PASCAL NEAR
mciParseArgument(
DWORD dwValue,
UINT wID,
LPSTR FAR * lplpstrOutput,
LPDWORD lpdwFlags,
LPSTR lpArgument,
LPSTR lpCurrentCommandItem
)
{
LPSTR lpstrInput = *lplpstrOutput;
UINT wRetval = 0;
/* Switch on the argument type */
switch (wID)
{
// The parameter is a flag
case MCI_FLAG:
break; /* switch */
case MCI_CONSTANT:
if (*lpstrInput == '\0')
wRetval = MCIERR_NO_INTEGER;
else if (!mciParseConstant (&lpstrInput, (LPDWORD)lpArgument,
lpCurrentCommandItem))
wRetval = MCIERR_BAD_CONSTANT;
break;
/* The parameter has an integer argument, try to parse it */
case MCI_INTEGER:
if (!mciParseInteger (&lpstrInput, (LPDWORD)lpArgument))
wRetval = MCIERR_BAD_INTEGER;
break; /* switch */
case MCI_RECT:
{
// Read in four RECT components. Resulting structure is the
// same as a Windows RECT
long lTemp;
int n;
for (n = 0; n < 4; ++n)
{
if (!mciParseInteger (&lpstrInput, &lTemp))
{
wRetval = MCIERR_BAD_INTEGER;
break;
}
// Each component is a signed 16 bit number
if (lTemp > 32768 || lTemp < -32767)
{
wRetval = MCIERR_BAD_INTEGER;
break;
}
((int FAR *)lpArgument)[n] = (int)lTemp;
// Remove leading blanks before next digit
while (*lpstrInput == ' ') ++lpstrInput;
}
break;
}
case MCI_STRING:
{
LPSTR lpstrOutput;
/* The parameter has an string argument, read it */
// Leading blanks have been removed by mciParseParams
/* Are there any non-blank characters left in the input? */
if (*lpstrInput == '\0')
{
/* Return an error */
wRetval = MCIERR_MISSING_STRING_ARGUMENT;
break; /* switch */
}
if ((wRetval = mciEatToken (&lpstrInput, ' ', &lpstrOutput, FALSE))
!= 0)
{
DOUT ("mciParseArgument: error parsing string\r\n");
return wRetval;
}
*(LPDWORD)lpArgument = (DWORD)lpstrOutput;
// NOTE: mciSendString frees the output string after command execution
// by calling mciParserFree
break; /* switch */
} /* case */
} /* switch */
/* Update the output flags if there was no error */
if (wRetval == 0)
{
if (*lpdwFlags & dwValue)
{
if (wID == MCI_CONSTANT)
wRetval = MCIERR_FLAGS_NOT_COMPATIBLE;
else
wRetval = MCIERR_DUPLICATE_FLAGS;
} else
*lpdwFlags |= dwValue;
}
/*
Return the input pointer pointing at the first character after
the argument or to the first character that is in error
*/
*lplpstrOutput = lpstrInput;
return wRetval;
}
/*
* @doc MCI INTERNAL
* @func UINT | mciParseParams | Parse the command parameters
*
* @parm LPCSTR | lpstrParams | The parameter string
*
* @parm LPCSTR | lpCommandList | The command table description
* of the command tokens
*
* @parm LPDWORD | lpdwFlags | Return the parsed flags here
*
* @parm LPDWORD | lpdwOutputParams | Return the list of parameters here
*
* @parm UINT | wParamsSize | The size allocated for the parameter list
*
* @parm LPSTR FAR * FAR * | lpPointerList | A NULL terminated list of
* pointers allocated by this function that should be free'd when
* no longer needed. The list itself should be free'd also. In both
* cases, use mciFree().
*
* @parm UINT FAR* | lpwParsingError | If not NULL then if the command is
* 'open', unrecognized keywords return an error here, and the
* function return value is 0 (unless other errors occur). This
* is used to allow reparsing of the command by mciLoadDevice
*
* @rdesc Returns zero if successful or one of the following error codes:
* @flag MCIERR_PARM_OVERFLOW | Not enough space for parameters
* @flag MCIERR_UNRECOGNIZED_KEYWORD | Unrecognized keyword
*
* @comm Any syntax error, including missing arguments, will result in
* a non-zero error return and invalid output data.
*
*/
UINT PASCAL NEAR
mciParseParams(
LPCSTR lpstrParams,
LPCSTR lpCommandList,
LPDWORD lpdwFlags,
LPSTR lpOutputParams,
UINT wParamsSize,
LPSTR FAR * FAR *lpPointerList,
UINT FAR* lpwOpenError
)
{
LPSTR lpFirstCommandItem, lpCurrentCommandItem;
UINT wArgumentPosition, wErr, wLen, wID, wDefaultID;
DWORD dwValue, dwDefaultValue;
BOOL bOpenCommand;
LPSTR FAR *lpstrPointerList;
UINT wPointers = 0;
UINT wHeaderSize = 0;
LPSTR lpDefaultCommandItem = NULL;
UINT wDefaultArgumentPosition;
if (lpwOpenError != NULL)
*lpwOpenError = 0;
// If the parameter pointer is NULL, return
if (lpstrParams == NULL)
{
DOUT ("Warning: lpstrParams is null in mciParseParams()\r\n");
return 0;
}
if ((lpstrPointerList =
mciAlloc ((MCI_MAX_PARAM_SLOTS + 1) * sizeof (LPSTR)))
== NULL)
{
*lpPointerList = NULL;
return MCIERR_OUT_OF_MEMORY;
}
// If this is the "open" command then allow parameter errors
bOpenCommand = lstrcmpi (lpCommandList, szOpen) == 0;
/* Clear all the flags */
*lpdwFlags = 0;
/* Initialize the entry for the callback message window handle */
wHeaderSize += sizeof (DWORD);
if (wHeaderSize > wParamsSize)
{
wErr = MCIERR_PARAM_OVERFLOW;
goto error_exit;
}
/* Skip past the header */
lpFirstCommandItem = (LPSTR)lpCommandList +
mciEatCommandEntry (lpCommandList, NULL, NULL);
wLen = mciEatCommandEntry (lpFirstCommandItem, &dwValue, &wID);
/* Make room in lpdwOutputParams for the return arguments if any */
if (wID == MCI_RETURN)
{
lpFirstCommandItem += wLen;
wHeaderSize += mciGetParamSize (dwValue, wID);
if (wHeaderSize > wParamsSize)
{
wErr = MCIERR_PARAM_OVERFLOW;
goto error_exit;
}
}
lpOutputParams += wHeaderSize;
// Scan the parameter string looking up each parameter in the given command
// list
while (TRUE)
{
LPCSTR lpstrArgument = NULL;
/* Remove leading blanks */
while (*lpstrParams == ' ') ++lpstrParams;
/* Break at end of parameter string */
if (*lpstrParams == '\0') break;
/* Scan for this parameter in the command list */
lpCurrentCommandItem = lpFirstCommandItem;
wLen = mciEatCommandEntry (lpCurrentCommandItem, &dwValue, &wID);
wArgumentPosition = 0;
/* While there are more tokens in the Command List */
while (wID != MCI_END_COMMAND)
{
/* Check for a default argument if not already read */
if (lpDefaultCommandItem == NULL &&
*lpCurrentCommandItem == '\0')
{
// Remember default argument
lpDefaultCommandItem = lpCurrentCommandItem;
dwDefaultValue = dwValue;
wDefaultID = wID;
wDefaultArgumentPosition = wArgumentPosition;
// break;
}
/* Check to see if this token matches */
else if ((lpstrArgument =
mciCheckToken (lpCurrentCommandItem, lpstrParams)) != NULL)
break;
/* This token did not match the input but advance the argument position */
wArgumentPosition += mciGetParamSize (dwValue, wID);
/* Go to next token */
lpCurrentCommandItem += wLen;
// Is this command parameter a constant?
if (wID == MCI_CONSTANT)
// Skip constant list
do
lpCurrentCommandItem +=
mciEatCommandEntry (lpCurrentCommandItem, &dwValue, &wID);
while (wID != MCI_END_CONSTANT);
wLen = mciEatCommandEntry (lpCurrentCommandItem, &dwValue, &wID);
} /* while */
/* If there were no matches */
if (lpstrArgument == NULL)
{
// If a default argument exists then try it
if (lpDefaultCommandItem != NULL)
{
lpstrArgument = lpstrParams;
dwValue = dwDefaultValue;
wID = wDefaultID;
lpCurrentCommandItem = lpDefaultCommandItem;
wArgumentPosition = wDefaultArgumentPosition;
} else
{
// Allow missing paramters on OPEN command if indicated by a non-null
// lpwOpenError address
if (!bOpenCommand || lpwOpenError == NULL)
{
wErr = MCIERR_UNRECOGNIZED_KEYWORD;
goto error_exit;
} else
{
// Skip the parameter if OPEN command
while (*lpstrParams != ' ' && *lpstrParams != '\0')
++lpstrParams;
if (lpwOpenError != NULL)
*lpwOpenError = MCIERR_UNRECOGNIZED_KEYWORD;
continue;
}
}
}
/* Is there room in the output buffer for this argument? */
if (wArgumentPosition + wHeaderSize + mciGetParamSize (dwValue, wID)
> wParamsSize)
{
DOUT ("mciParseParams: parameter space overflow\r\n");
wErr = MCIERR_PARAM_OVERFLOW;
goto error_exit;
}
// Remove leading blanks
while (*lpstrArgument == ' ') ++lpstrArgument;
/* Process this parameter, filling in any flags or arguments */
if ((wErr = mciParseArgument (dwValue, wID,
&lpstrArgument, lpdwFlags,
&lpOutputParams[wArgumentPosition],
lpCurrentCommandItem))
!= 0)
goto error_exit;
lpstrParams = lpstrArgument;
if (wID == MCI_STRING)
{
if (wPointers >= MCI_MAX_PARAM_SLOTS)
{
DOUT ("Warning: Out of pointer list slots in mciParseParams\r\n");
break;
}
(DWORD)lpstrPointerList[wPointers++] =
*(LPDWORD)&lpOutputParams[wArgumentPosition];
}
/* Continue reading the parameter string */
} /* while */
// Terminate list
lpstrPointerList[wPointers] = NULL;
// Copy reference for caller
*lpPointerList = lpstrPointerList;
// Return Success
return 0;
error_exit:
*lpPointerList = NULL;
// Terminate list
lpstrPointerList[wPointers] = NULL;
mciParserFree (lpstrPointerList);
return wErr;
}
/*
* @doc INTERNAL MCI
* @func UINT | mciParseCommand | This function converts an MCI
* control string to an MCI control message suitable for sending to
* <f mciSendCommand>. The input string usually comes from <f mciSendString>
* and always has the device name stripped off the front.
*
* @parm UINT | wDeviceID | Identifies the device. First searches the parsing
* table belonging to the driver.
* Then searches the command tables matching the type
* of the given device. Then searches the core command table.
*
* @parm LPSTR | lpstrCommand | An MCI control command without
* a device name prefix. There must be no leading or trailing
* blanks.
*
* @parm LPCSTR | lpstrDeviceName | The device name (second token on the
* command line). It is used to identify the device type.
*
* @parm LPSTR FAR * | lpCommandList | If not NULL then the address of
* the command list for the parsed command (if successful) is copied here.
* It is used later by mciSendString when parsing arguments
*
* @parm UINT FAR* | lpwTable | The table resource ID to be unlocked
* after parsing. Returned to caller.
*
* @rdesc Returns the command ID or 0 if not found.
*
*/
UINT PASCAL NEAR
mciParseCommand(
UINT wDeviceID,
LPSTR lpstrCommand,
LPCSTR lpstrDeviceName,
LPSTR FAR * lpCommandList,
UINT FAR* lpwTable)
{
LPSTR lpCommandItem;
UINT wMessage;
// Put the command in lower case
//!! mciToLower (lpstrCommand);
// Look up lpstrCommand in the parser's command tables.
if ((lpCommandItem = FindCommandItem (wDeviceID, lpstrDeviceName,
lpstrCommand,
&wMessage, lpwTable))
== NULL)
return 0;
/* Return the command list to the caller */
if (lpCommandList != NULL)
*lpCommandList = lpCommandItem;
else
DOUT ("Warning: NULL lpCommandList in mciParseCommanad\r\n");
return wMessage;
}
/*
* @doc INTERNAL MCI
* @func void | mciParserFree | Free any buffers allocated to
* receive string arguments.
*
* @parm LPSTR FAR * | lpstrPointerList | A NULL terminated list of far
* pointers to strings to be free'd
*
*/
void PASCAL NEAR
mciParserFree(
LPSTR FAR *lpstrPointerList
)
{
LPSTR FAR *lpstrOriginal = lpstrPointerList;
if (lpstrPointerList == NULL)
return;
while (*lpstrPointerList != NULL)
mciFree (*lpstrPointerList++);
mciFree (lpstrOriginal);
}