fn prev()

in common/rusty_leveldb_sgx/src/block.rs [213:247]

• 25 lines of code
• 6 McCabe index (conditional complexity)

    fn prev(&mut self) -> bool {
        // as in the original implementation -- seek to last restart point, then look for key
        let orig_offset = self.current_entry_offset;

        // At the beginning, can't go further back
        if orig_offset == 0 {
            self.reset();
            return false;
        }

        while self.get_restart_point(self.current_restart_ix) >= orig_offset {
            // todo: double check this
            if self.current_restart_ix == 0 {
                self.offset = self.restarts_off;
                self.current_restart_ix = self.number_restarts();
                break;
            }
            self.current_restart_ix -= 1;
        }

        self.offset = self.get_restart_point(self.current_restart_ix);
        assert!(self.offset < orig_offset);

        let mut result;

        // Stop if the next entry would be the original one (self.offset always points to the start
        // of the next entry)
        loop {
            result = self.advance();
            if self.offset >= orig_offset {
                break;
            }
        }
        result
    }