441 static sqlite3_int64 apndReadMark(sqlite3_int64 sz, sqlite3_file *pFile){  in apndReadMark()  argument
447   if( APND_MARK_SIZE!=(sz & 0x1ff) ) return -1;  in apndReadMark()
448   rc = pFile->pMethods->xRead(pFile, a, APND_MARK_SIZE, sz-APND_MARK_SIZE);  in apndReadMark()
456   if( iMark > (sz - APND_MARK_SIZE - 512) ) return -1;  in apndReadMark()
466 static int apndIsAppendvfsDatabase(sqlite3_int64 sz, sqlite3_file *pFile){  in apndIsAppendvfsDatabase()  argument
469   sqlite3_int64 iMark = apndReadMark(sz, pFile);  in apndIsAppendvfsDatabase()
478      && (sz & 0x1ff) == APND_MARK_SIZE  in apndIsAppendvfsDatabase()
479      && sz>=512+APND_MARK_SIZE  in apndIsAppendvfsDatabase()
491 static int apndIsOrdinaryDatabaseFile(sqlite3_int64 sz, sqlite3_file *pFile){  in apndIsOrdinaryDatabaseFile()  argument
493   if( apndIsAppendvfsDatabase(sz, pFile) /* rule 2 */  in apndIsOrdinaryDatabaseFile()
494    || (sz & 0x1ff) != 0  in apndIsOrdinaryDatabaseFile()
518   sqlite3_int64 sz = 0;  in apndOpen()  local
532     rc = pBaseFile->pMethods->xFileSize(pBaseFile, &sz);  in apndOpen()
541   if( apndIsOrdinaryDatabaseFile(sz, pBaseFile) ){  in apndOpen()
548   pApndFile->iPgOne = apndReadMark(sz, pFile);  in apndOpen()
550     pApndFile->iMark = sz - APND_MARK_SIZE; /* Append mark found */  in apndOpen()
563     pApndFile->iPgOne = APND_START_ROUNDUP(sz);  in apndOpen()