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/*
Copyright (c) Ferruccio Barletta (ferruccio.barletta@gmail.com), 2010
This file is part of BDBVu.
BDBVu is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
BDBVu is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with BDBVu. If not, see <http://www.gnu.org/licenses/>.
*/
#include "database.h"
using namespace std;
database::database()
: sdblist(), keylist(), sdbtype(),
env(0), db(0), sdb(0)
{
env.open(0, DB_INIT_MPOOL | DB_CREATE | DB_PRIVATE, 0);
}
database::~database()
{
close();
env.close(0);
}
//
// open a new database
//
void database::open(const char* filename)
{
close();
db = new Db(&env, 0);
try {
db->open(0, filename, 0, DB_UNKNOWN, DB_RDONLY | DB_RDWRMASTER, 0);
multiple = db->get_multiple() != 0;
if (multiple)
buildDatabaseList();
this->filename = filename;
} catch (DbException ex) {
close();
throw dbexception(QString("%1\n\nfilename: %2\n\nerrno: %3").arg(ex.what()).arg(filename).arg(ex.get_errno()));
}
}
//
// close current database
//
void database::close()
{
if (isopen()) {
closesubdb();
db->close(0);
delete db;
db = 0;
filename = "";
}
}
//
// convert a byte buffer to a QString
//
static QString getString(void *buf, int len)
{
char *p = static_cast<char *>(buf);
QString s;
while (len--) {
// Do not append ending NULL character!
if(!(len == 0 && *p == '\0')) {
s.append(QChar(*p++));
}
}
return s;
}
//
// create list of available sub-databases
//
void database::buildDatabaseList()
{
sdblist.clear();
Dbc *cursor;
db->cursor(0, &cursor, 0);
Dbt key, data;
while (cursor->get(&key, &data, DB_IGNORE_LEASE | DB_NEXT) != DB_NOTFOUND)
sdblist.append(getString(key.get_data(), key.get_size()));
}
//
// open a sub-database
//
void database::opensubdb(const QString &dbname)
{
closesubdb();
try {
sdb = new Db(&env, 0);
sdb->open(0, filename.toLatin1(), dbname.toLatin1(), DB_UNKNOWN, DB_RDONLY | DB_RDWRMASTER, 0);
buildKeyList();
} catch (DbException ex) {
closesubdb();
throw dbexception(QString("%1\n\ndatabase: %2\n\nerrno: %3").arg(ex.what()).arg(dbname).arg(ex.get_errno()));
}
}
//
// close sub-database
//
void database::closesubdb()
{
if (sdb != 0) {
sdb->close(0);
delete sdb;
sdb = 0;
}
}
//
// generate a "visible" string by converting non-ASCII characters to visible escape sequences
//
static QString makeVisible(const QString& s) {
QString r;
foreach (QChar c, s) {
if (c != QChar('\n') && (c < QChar(' ') || c > QChar('~')))
r.append(QString("\\%1").arg(c.toLatin1() & 0xff, 2, 16, QChar('0')));
else if (c == QChar('\\'))
r.append("\\\\");
else
r.append(c);
}
return r;
}
//
// build key list for sub-database
//
void database::buildKeyList()
{
// record sub-database type
DBTYPE t;
sdb->get_type(&t);
switch (t) {
case DB_RECNO: sdbtype = "DB_RECNO"; break;
case DB_QUEUE: sdbtype = "DB_QUEUE"; break;
case DB_BTREE: sdbtype = "DB_BTREE"; break;
case DB_HASH: sdbtype = "DB_HASH"; break;
default: sdbtype = "unknown"; break;
}
// build the key list
keylist.clear();
Dbc *cursor;
sdb->cursor(0, &cursor, 0);
Dbt key, data;
while (cursor->get(&key, &data, DB_IGNORE_LEASE | DB_NEXT) != DB_NOTFOUND) {
dbkey k;
if (t == DB_RECNO || t == DB_QUEUE) {
char *src = static_cast<char *>(key.get_data());
k.display = QString("%1").arg(*reinterpret_cast<int *>(&src[0]));
} else {
k.display = makeVisible(getString(key.get_data(), key.get_size()));
}
k.data = getString(data.get_data(), data.get_size());
keylist.push_back(k);
}
}
//
// fetch a record using the key at index
//
QString database::getRecord(int index)
{
if (index < 0 || index >= keylist.size())
return QString("-- bad index: %1").arg(index);
return makeVisible(keylist[index].data);
}
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