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/*
* segfile.cc - Handle access to to a data file consisting of segments.
*
* Copyright (C) 2000-2001 The Exult Team
*
* 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 "exceptions.h"
#include "segfile.h"
#include "utils.h"
/*
* Open file.
*/
Segment_file::Segment_file
(
std::string nm // Path to file.
) : filename(nm), num_segments(0)
{
U7open(file, filename.c_str());
file.seekg(0x54); // Get # of segments.
num_segments = Read4(file);
if( !file.good() )
throw file_read_exception(filename);
}
/*
* Read in a given segment.
*
* returns the data in a new allocated buffer so it should be freed by the caller.
*/
char* Segment_file::retrieve
(
uint32 index, // Number desired.
std::size_t& len
)
{
char *buffer;
if (index >= num_segments)
throw exult_exception("objnum too large in read_object()");
file.seekg(0x80 + 8*index); // Get to info.
long offset = Read4(file); // Get offset, length.
len = Read4(file);
if (!len)
throw file_read_exception(filename);
file.seekg(offset); // Get to data.
buffer = new char[len]; // Allocate buffer.
file.read(buffer, len); // Read it.
if( !file.good() )
throw file_read_exception(filename);
return buffer;
}
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