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/*
* Copyright (C) 2000-2022 The Exult Team
*
* Original file by Dancer A.L Vesperman
*
* This program 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 2 of the License, or
* (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include "Table.h"
#include "exceptions.h"
using std::FILE;
using std::size_t;
using std::string;
void Table::index_file() {
if (!data) {
throw file_read_exception(identifier.name);
}
if (!is_table(data.get())) { // Not a table file we recognise
throw wrong_file_type_exception(identifier.name, "TABLE");
}
while (true) {
Reference f;
f.size = data->read2();
if (f.size == 65535) {
break;
}
f.offset = data->read4();
object_list.push_back(f);
}
}
/**
* Verify if a file is a table. Note that this is a STATIC method.
* @param in DataSource to verify.
* @return Whether or not the DataSource is a table file.
*/
bool Table::is_table(IDataSource* in) {
const size_t pos = in->getPos();
const size_t file_size = in->getSize();
in->seek(0);
while (true) {
const uint16 size = in->read2();
// End of table marker.
if (size == 65535) {
break;
}
const uint32 offset = in->read4();
if (size > file_size || offset > file_size) {
in->seek(pos);
return false;
}
}
in->seek(pos);
return true;
}
/**
* Verify if a file is a table. Note that this is a STATIC method.
* @param fname Name of file to verify.
* @return Whether or not the file is a table file. Returns false if
* the file does not exist.
*/
bool Table::is_table(const std::string& fname) {
IFileDataSource ds(fname.c_str());
return ds.good() && is_table(&ds);
}
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