public FuncDef(short nArg, byte iPrefEnc, FUNC iflags, object pUserData, FuncDef pNext, dxFunc xFunc, dxStep xStep, dxFinal xFinalize, string zName, FuncDef pHash, FuncDestructor pDestructor)
{
this.nArg = nArg;
this.iPrefEnc = iPrefEnc;
this.flags = iflags;
this.pUserData = pUserData;
this.pNext = pNext;
this.xFunc = xFunc;
this.xStep = xStep;
this.xFinalize = xFinalize;
this.zName = zName;
this.pHash = pHash;
this.pDestructor = pDestructor;
}
public FuncDef(short nArg, byte iPrefEnc, FUNC iflags, object pUserData, FuncDef pNext, dxFunc xFunc, dxStep xStep, dxFinal xFinalize, string zName, FuncDef pHash, FuncDestructor pDestructor)
{
this.nArg = nArg;
this.iPrefEnc = iPrefEnc;
this.flags = iflags;
this.pUserData = pUserData;
this.pNext = pNext;
this.xFunc = xFunc;
this.xStep = xStep;
this.xFinalize = xFinalize;
this.zName = zName;
this.pHash = pHash;
this.pDestructor = pDestructor;
}
static int sqlite3_create_function_v2(
sqlite3 db,
string zFunc,
int nArg,
int enc,
object p,
dxFunc xFunc, //)(sqlite3_context*,int,sqlite3_value *),
dxStep xStep,//)(sqlite3_context*,int,sqlite3_value *),
dxFinal xFinal,//)(sqlite3_context)
dxFDestroy xDestroy//)(void )
)
{
int rc = SQLITE_ERROR;
FuncDestructor pArg = null;
sqlite3_mutex_enter( db.mutex );
if ( xDestroy != null )
{
pArg = new FuncDestructor();//(FuncDestructor )sqlite3DbMallocZero(db, sizeof(FuncDestructor));
//if( null==pArg ){
// xDestroy(p);
// goto out;
//}
pArg.xDestroy = xDestroy;
pArg.pUserData = p;
}
rc = sqlite3CreateFunc( db, zFunc, nArg, (byte)enc, p, xFunc, xStep, xFinal, pArg );
if ( pArg != null && pArg.nRef == 0 )
{
Debug.Assert( rc != SQLITE_OK );
//xDestroy(p);
sqlite3DbFree( db, ref pArg );
}
//_out:
rc = sqlite3ApiExit( db, rc );
sqlite3_mutex_leave( db.mutex );
return rc;
}
/*
** This function is exactly the same as sqlite3_create_function(), except
** that it is designed to be called by internal code. The difference is
** that if a malloc() fails in sqlite3_create_function(), an error code
** is returned and the mallocFailed flag cleared.
*/
static int sqlite3CreateFunc(
sqlite3 db,
string zFunctionName,
int nArg,
u8 enc,
object pUserData,
dxFunc xFunc, //)(sqlite3_context*,int,sqlite3_value *),
dxStep xStep,//)(sqlite3_context*,int,sqlite3_value *),
dxFinal xFinal, //)(sqlite3_context),
FuncDestructor pDestructor
)
{
FuncDef p;
int nName;
Debug.Assert( sqlite3_mutex_held( db.mutex ) );
if ( zFunctionName == null ||
( xFunc != null && ( xFinal != null || xStep != null ) ) ||
( xFunc == null && ( xFinal != null && xStep == null ) ) ||
( xFunc == null && ( xFinal == null && xStep != null ) ) ||
( nArg < -1 || nArg > SQLITE_MAX_FUNCTION_ARG ) ||
( 255 < ( nName = sqlite3Strlen30( zFunctionName ) ) ) )
{
return SQLITE_MISUSE_BKPT();
}
#if !SQLITE_OMIT_UTF16
/* If SQLITE_UTF16 is specified as the encoding type, transform this
** to one of SQLITE_UTF16LE or SQLITE_UTF16BE using the
** SQLITE_UTF16NATIVE macro. SQLITE_UTF16 is not used internally.
**
** If SQLITE_ANY is specified, add three versions of the function
** to the hash table.
*/
if( enc==SQLITE_UTF16 ){
enc = SQLITE_UTF16NATIVE;
}else if( enc==SQLITE_ANY ){
int rc;
rc = sqlite3CreateFunc(db, zFunctionName, nArg, SQLITE_UTF8,
pUserData, xFunc, xStep, xFinal, pDestructor);
if( rc==SQLITE_OK ){
rc = sqlite3CreateFunc(db, zFunctionName, nArg, SQLITE_UTF16LE,
pUserData, xFunc, xStep, xFinal, pDestructor);
}
if( rc!=SQLITE_OK ){
return rc;
}
enc = SQLITE_UTF16BE;
}
#else
enc = SQLITE_UTF8;
#endif
/* Check if an existing function is being overridden or deleted. If so,
** and there are active VMs, then return SQLITE_BUSY. If a function
** is being overridden/deleted but there are no active VMs, allow the
** operation to continue but invalidate all precompiled statements.
*/
p = sqlite3FindFunction( db, zFunctionName, nName, nArg, enc, 0 );
if ( p != null && p.iPrefEnc == enc && p.nArg == nArg )
{
if ( db.activeVdbeCnt != 0 )
{
sqlite3Error( db, SQLITE_BUSY,
"unable to delete/modify user-function due to active statements" );
//Debug.Assert( 0 == db.mallocFailed );
return SQLITE_BUSY;
}
else
{
sqlite3ExpirePreparedStatements( db );
}
}
p = sqlite3FindFunction( db, zFunctionName, nName, nArg, enc, 1 );
Debug.Assert( p != null /*|| db.mallocFailed != 0 */ );
//if ( p == null )
//{
// return SQLITE_NOMEM;
//}
/* If an older version of the function with a configured destructor is
** being replaced invoke the destructor function here. */
functionDestroy( db, p );
if ( pDestructor != null )
{
pDestructor.nRef++;
}
p.pDestructor = pDestructor;
p.flags = 0;
p.xFunc = xFunc;
p.xStep = xStep;
p.xFinalize = xFinal;
p.pUserData = pUserData;
p.nArg = (i16)nArg;
return SQLITE_OK;
}
