This page hosts a formal specification of .dat file format of Fallout 2 using Kaitai Struct. This specification can be automatically translated into a variety of programming languages to get a parsing library.
All parsing code for Java generated by Kaitai Struct depends on the Java runtime library. You have to install it before you can parse data.
The Java runtime library is published in the Maven Central Repository. Refer to the artifact page for instructions how to add it into your project with the build tool that you use.
Parse a local file and get structure in memory:
Fallout2Dat data = Fallout2Dat.fromFile("path/to/local/file.dat");
Or parse structure from a byte array:
byte[] someArray = new byte[] { ... };
Fallout2Dat data = new Fallout2Dat(new ByteBufferKaitaiStream(someArray));
After that, one can get various attributes from the structure by invoking getter methods like:
data.footer() // => get footer
// This is a generated file! Please edit source .ksy file and use kaitai-struct-compiler to rebuild
import io.kaitai.struct.ByteBufferKaitaiStream;
import io.kaitai.struct.KaitaiStruct;
import io.kaitai.struct.KaitaiStream;
import java.io.IOException;
import java.util.Map;
import java.util.HashMap;
import java.nio.charset.Charset;
import java.util.ArrayList;
public class Fallout2Dat extends KaitaiStruct {
public static Fallout2Dat fromFile(String fileName) throws IOException {
return new Fallout2Dat(new ByteBufferKaitaiStream(fileName));
}
public enum Compression {
NONE(0),
ZLIB(1);
private final long id;
Compression(long id) { this.id = id; }
public long id() { return id; }
private static final Map<Long, Compression> byId = new HashMap<Long, Compression>(2);
static {
for (Compression e : Compression.values())
byId.put(e.id(), e);
}
public static Compression byId(long id) { return byId.get(id); }
}
public Fallout2Dat(KaitaiStream _io) {
this(_io, null, null);
}
public Fallout2Dat(KaitaiStream _io, KaitaiStruct _parent) {
this(_io, _parent, null);
}
public Fallout2Dat(KaitaiStream _io, KaitaiStruct _parent, Fallout2Dat _root) {
super(_io);
this._parent = _parent;
this._root = _root == null ? this : _root;
_read();
}
private void _read() {
}
public static class Pstr extends KaitaiStruct {
public static Pstr fromFile(String fileName) throws IOException {
return new Pstr(new ByteBufferKaitaiStream(fileName));
}
public Pstr(KaitaiStream _io) {
this(_io, null, null);
}
public Pstr(KaitaiStream _io, Fallout2Dat.File _parent) {
this(_io, _parent, null);
}
public Pstr(KaitaiStream _io, Fallout2Dat.File _parent, Fallout2Dat _root) {
super(_io);
this._parent = _parent;
this._root = _root;
_read();
}
private void _read() {
this.size = this._io.readU4le();
this.str = new String(this._io.readBytes(size()), Charset.forName("ASCII"));
}
private long size;
private String str;
private Fallout2Dat _root;
private Fallout2Dat.File _parent;
public long size() { return size; }
public String str() { return str; }
public Fallout2Dat _root() { return _root; }
public Fallout2Dat.File _parent() { return _parent; }
}
public static class Footer extends KaitaiStruct {
public static Footer fromFile(String fileName) throws IOException {
return new Footer(new ByteBufferKaitaiStream(fileName));
}
public Footer(KaitaiStream _io) {
this(_io, null, null);
}
public Footer(KaitaiStream _io, Fallout2Dat _parent) {
this(_io, _parent, null);
}
public Footer(KaitaiStream _io, Fallout2Dat _parent, Fallout2Dat _root) {
super(_io);
this._parent = _parent;
this._root = _root;
_read();
}
private void _read() {
this.indexSize = this._io.readU4le();
this.fileSize = this._io.readU4le();
}
private long indexSize;
private long fileSize;
private Fallout2Dat _root;
private Fallout2Dat _parent;
public long indexSize() { return indexSize; }
public long fileSize() { return fileSize; }
public Fallout2Dat _root() { return _root; }
public Fallout2Dat _parent() { return _parent; }
}
public static class Index extends KaitaiStruct {
public static Index fromFile(String fileName) throws IOException {
return new Index(new ByteBufferKaitaiStream(fileName));
}
public Index(KaitaiStream _io) {
this(_io, null, null);
}
public Index(KaitaiStream _io, Fallout2Dat _parent) {
this(_io, _parent, null);
}
public Index(KaitaiStream _io, Fallout2Dat _parent, Fallout2Dat _root) {
super(_io);
this._parent = _parent;
this._root = _root;
_read();
}
private void _read() {
this.fileCount = this._io.readU4le();
this.files = new ArrayList<File>();
for (int i = 0; i < fileCount(); i++) {
this.files.add(new File(this._io, this, _root));
}
}
private long fileCount;
private ArrayList<File> files;
private Fallout2Dat _root;
private Fallout2Dat _parent;
public long fileCount() { return fileCount; }
public ArrayList<File> files() { return files; }
public Fallout2Dat _root() { return _root; }
public Fallout2Dat _parent() { return _parent; }
}
public static class File extends KaitaiStruct {
public static File fromFile(String fileName) throws IOException {
return new File(new ByteBufferKaitaiStream(fileName));
}
public File(KaitaiStream _io) {
this(_io, null, null);
}
public File(KaitaiStream _io, Fallout2Dat.Index _parent) {
this(_io, _parent, null);
}
public File(KaitaiStream _io, Fallout2Dat.Index _parent, Fallout2Dat _root) {
super(_io);
this._parent = _parent;
this._root = _root;
_read();
}
private void _read() {
this.name = new Pstr(this._io, this, _root);
this.flags = Fallout2Dat.Compression.byId(this._io.readU1());
this.sizeUnpacked = this._io.readU4le();
this.sizePacked = this._io.readU4le();
this.offset = this._io.readU4le();
}
private byte[] contentsRaw;
public byte[] contentsRaw() {
if (this.contentsRaw != null)
return this.contentsRaw;
if (flags() == Fallout2Dat.Compression.NONE) {
KaitaiStream io = _root()._io();
long _pos = io.pos();
io.seek(offset());
this.contentsRaw = io.readBytes(sizeUnpacked());
io.seek(_pos);
}
return this.contentsRaw;
}
private byte[] contentsZlib;
public byte[] contentsZlib() {
if (this.contentsZlib != null)
return this.contentsZlib;
if (flags() == Fallout2Dat.Compression.ZLIB) {
KaitaiStream io = _root()._io();
long _pos = io.pos();
io.seek(offset());
this._raw_contentsZlib = io.readBytes(sizePacked());
this.contentsZlib = KaitaiStream.processZlib(_raw_contentsZlib);
io.seek(_pos);
}
return this.contentsZlib;
}
private byte[] contents;
public byte[] contents() {
if (this.contents != null)
return this.contents;
if ( ((flags() == Fallout2Dat.Compression.ZLIB) || (flags() == Fallout2Dat.Compression.NONE)) ) {
this.contents = (flags() == Fallout2Dat.Compression.ZLIB ? contentsZlib() : contentsRaw());
}
return this.contents;
}
private Pstr name;
private Compression flags;
private long sizeUnpacked;
private long sizePacked;
private long offset;
private Fallout2Dat _root;
private Fallout2Dat.Index _parent;
private byte[] _raw_contentsZlib;
public Pstr name() { return name; }
public Compression flags() { return flags; }
public long sizeUnpacked() { return sizeUnpacked; }
public long sizePacked() { return sizePacked; }
public long offset() { return offset; }
public Fallout2Dat _root() { return _root; }
public Fallout2Dat.Index _parent() { return _parent; }
public byte[] _raw_contentsZlib() { return _raw_contentsZlib; }
}
private Footer footer;
public Footer footer() {
if (this.footer != null)
return this.footer;
long _pos = this._io.pos();
this._io.seek((_io().size() - 8));
this.footer = new Footer(this._io, this, _root);
this._io.seek(_pos);
return this.footer;
}
private Index index;
public Index index() {
if (this.index != null)
return this.index;
long _pos = this._io.pos();
this._io.seek(((_io().size() - 8) - footer().indexSize()));
this.index = new Index(this._io, this, _root);
this._io.seek(_pos);
return this.index;
}
private Fallout2Dat _root;
private KaitaiStruct _parent;
public Fallout2Dat _root() { return _root; }
public KaitaiStruct _parent() { return _parent; }
}