cxx_multi.cpp

/*-
 * See the file LICENSE for redistribution information.
 *
 * Copyright (c) 1997-2005
 *      Sleepycat Software.  All rights reserved.
 *
 * $Id: cxx_multi.cpp,v 12.3 2005/09/30 07:40:20 mjc Exp $
 */

#include "db_config.h"

#include "db_cxx.h"

DbMultipleIterator::DbMultipleIterator(const Dbt &dbt)
 : data_((u_int8_t*)dbt.get_data()),
   p_((u_int32_t*)(data_ + dbt.get_size() - sizeof(u_int32_t)))
{
}

bool DbMultipleDataIterator::next(Dbt &data)
{
        if (*p_ == (u_int32_t)-1) {
                data.set_data(0);
                data.set_size(0);
                p_ = 0;
        } else {
                data.set_data(data_ + *p_--);
                data.set_size(*p_--);
                if (data.get_size() == 0 && data.get_data() == data_)
                        data.set_data(0);
        }
        return (p_ != 0);
}

bool DbMultipleKeyDataIterator::next(Dbt &key, Dbt &data)
{
        if (*p_ == (u_int32_t)-1) {
                key.set_data(0);
                key.set_size(0);
                data.set_data(0);
                data.set_size(0);
                p_ = 0;
        } else {
                key.set_data(data_ + *p_--);
                key.set_size(*p_--);
                data.set_data(data_ + *p_--);
                data.set_size(*p_--);
        }
        return (p_ != 0);
}

bool DbMultipleRecnoDataIterator::next(db_recno_t &recno, Dbt &data)
{
        if (*p_ == (u_int32_t)0) {
                recno = 0;
                data.set_data(0);
                data.set_size(0);
                p_ = 0;
        } else {
                recno = *p_--;
                data.set_data(data_ + *p_--);
                data.set_size(*p_--);
        }
        return (p_ != 0);
}

---