/*
** Make a full copy of pFrom into pTo. Prior contents of pTo are
** freed before the copy is made.
*/
static int sqlite3VdbeMemCopy( MemRef pTo, MemRef pFrom )
{
int rc = SQLITE_OK;
Debug.Assert( ( pFrom.flags & MEM_RowSet ) == 0 );
sqlite3VdbeMemReleaseExternal( pTo );
pFrom.CopyTo( pTo );// memcpy(pTo, pFrom, MEMCELLSIZE);
pTo.flags = (u16)( pTo.flags & ~MEM_Dyn );
if ( ( pTo.flags & ( MEM_Str | MEM_Blob ) ) != 0 )
{
if ( 0 == ( pFrom.flags & MEM_Static ) )
{
pTo.flags |= MEM_Ephem;
rc = sqlite3VdbeMemMakeWriteable( pTo );
}
}
return rc;
}
/*
** Transfer the contents of pFrom to pTo. Any existing value in pTo is
** freed. If pFrom contains ephemeral data, a copy is made.
**
** pFrom contains an SQL NULL when this routine returns.
*/
static void sqlite3VdbeMemMove( ref Mem pTo, MemRef pFrom )
{
Debug.Assert( pFrom.db == null || sqlite3_mutex_held( pFrom.db.mutex ) );
Debug.Assert( pTo.db == null || sqlite3_mutex_held( pTo.db.mutex ) );
Debug.Assert( pFrom.db == null || pTo.db == null || pFrom.db == pTo.db );
sqlite3VdbeMemRelease( ref pTo );
pFrom.CopyTo( ref pTo );// memcpy(pTo, pFrom, Mem).Length;
pFrom.flags = MEM_Null;
pFrom.xDel = null;
pFrom.z = null;
pFrom.zBLOB = null;
//pFrom.zMalloc=null;
}
/*
** Size of struct Mem not including the Mem.zMalloc member.
*/
//#define MEMCELLSIZE (size_t)(&(((Mem *)0).zMalloc))
/*
** Make an shallow copy of pFrom into pTo. Prior contents of
** pTo are freed. The pFrom.z field is not duplicated. If
** pFrom.z is used, then pTo.z points to the same thing as pFrom.z
** and flags gets srcType (either MEM_Ephem or MEM_Static).
*/
static void sqlite3VdbeMemShallowCopy( MemRef pTo, MemRef pFrom, int srcType )
{
Debug.Assert( ( pFrom.flags & MEM_RowSet ) == 0 );
sqlite3VdbeMemReleaseExternal( pTo );
pFrom.CopyTo( pTo );// memcpy(pTo, pFrom, MEMCELLSIZE);
pTo.xDel = null;
if ( ( pFrom.flags & MEM_Dyn ) != 0 )
{//|| pFrom.z==pFrom.zMalloc ){
pTo.flags = (u16)( pFrom.flags & ~( MEM_Dyn | MEM_Static | MEM_Ephem ) );
Debug.Assert( srcType == MEM_Ephem || srcType == MEM_Static );
pTo.flags |= (u16)srcType;
}
}