323   int pgszSrc = 0;    /* Source page size */  in sqlite3_backup_step()  local
381     pgszSrc = sqlite3BtreeGetPageSize(p->pSrc);  in sqlite3_backup_step()
384     if( SQLITE_OK==rc && destMode==PAGER_JOURNALMODE_WAL && pgszSrc!=pgszDest ){  in sqlite3_backup_step()
450         assert( pgszSrc==sqlite3BtreeGetPageSize(p->pSrc) );  in sqlite3_backup_step()
452         if( pgszSrc<pgszDest ){  in sqlite3_backup_step()
453           int ratio = pgszDest/pgszSrc;  in sqlite3_backup_step()
459           nDestTruncate = nSrcPage * (pgszSrc/pgszDest);  in sqlite3_backup_step()
463         if( pgszSrc<pgszDest ){  in sqlite3_backup_step()
473           const i64 iSize = (i64)pgszSrc * (i64)nSrcPage;  in sqlite3_backup_step()
511             iOff=PENDING_BYTE+pgszSrc;   in sqlite3_backup_step()
513             iOff+=pgszSrc  in sqlite3_backup_step()
516             const Pgno iSrcPg = (Pgno)((iOff/pgszSrc)+1);  in sqlite3_backup_step()
520               rc = sqlite3OsWrite(pFile, zData, pgszSrc, iOff);  in sqlite3_backup_step()