segfile.cc

Go to the documentation of this file.

/*
 *  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;
}

---